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Home My WebLink About20160191.tiff TRI -STATE GENERATION & TRANSMISSION , INC . GOLFER SUBSTATION DRAINAGE REPORT =�p,Dp L*cep t` 7#traapi � July 2015 19 5Lco �: . •• Prepared by: DEL - M (3NT CONSULTANTS , INC . nk A ) ENGINEERING • SURVEYING 125 Colorado Ave. • Nantro5e, CO 81401 r 070) 249-2251 • (97O) 249-2342 FAX � r vo.•r.det rnon:.com • serviced&-mont.com DEC Golfer Substation Drainage Report II TRI -STATE GENERATION & TRANSMISSION , INC . COLFER SUBSTATION DRAINAGE REPORT o�p,�O Lr�F`‘‘, o .N'4NE S'•..S� ') f `-',. 4ta ,la— is, o 47 -+: i \t7/lo! l S••W I��`\S••. ..••• C) s I hereby certify that this report for the drainage design of the Colter Substation was prepared by me (or under my direct supervision) in accordance with the provisions of the Weld County storm drainage criteria for the owners thereof. Ca -/-132 ll --Q2/2;176 David Schieldt, P.E. Coffer Substation Drainage Report CERTIFICATION OF COMPLIANCE ENGINEERING DESIGNED TO WELD COUNTY CODE STANDARDS AND CRITERIA I S1' ctvihc.J JO1n ► cM- , Consultant Engineer for i *lie- A se nt lip d+ 1 cco.Nsvh i s..60N ("Applicant"), understand and acknowledge that Applicant is seeking land use approval of (s [ft. C ScA,644 f id ("Application") for the property described in the attached Exhibit "A." I have designed or reviewed the design ("Design") for the proposed land use set forth in the Application. I hereby certify, on behalf of Applicant that the Design will meet all applicable drainage requirements of the Weld County Code with the exception of variance(s) described below. This certification is not a guarantee or warranty either expressed or implied. (Engineer's Stamp) o..•YNE••c• • t'I, P • e i c 0 471 5 q71V ‘��`NY/MAL == Engineer of Record Signature VARIANCE REQUEST 1 ) Describe the Weld County Code criteria of which a variance is being requested. 2) Describe why it is not possible to meet the Weld County Code. 3) Describe the proposed alternative with engineering rational which supports the intent of the Weld County Code. I understand and agree that the intention of the Code is to reduce impacts of development on neighboring downstream properties and the public. I understand if this variance request is approved it is not precedent setting and is based on site specific constraints. Planning Director Approval indicated when signed by director or appointee: Planning Director Name Signature Date of approval 1/13/15 TABLE OF CONTENTS 1 .0 General Location and Description 1 -1 1 .1 Site Location 1 -1 1 .2 Site Description 1 -1 0 2.0 Drainage Basins and Sub-Basins 2-1 2.1 Existing Drainage Sub-Basins 2-1 2.2 Proposed Drainage Sub-Basins 2-1 3.0 Drainage Design Criteria 3-1 3.1 Methodology 3-1 3.2 Land Cover Hydrologic Properties 3-1 3,3 Weighted Design Values 3-1 4.0 Drainage Facility Design 4-1 4.1 Historical Drainage 4-1 4.2 Proposed Drainage 4-1 5.0 Conclusions 5-1 5.1 Drainage Concept 5-1 5.2 Compliance with the Weld County Code 5-1 6.0 References 6-1 Appendix A — Site Maps & Design Drawings Appendix B — NRCS Soils Report Appendix C — Site Specific Physical Design Properties Appendix D — SWMM Modeling Results Coffer Substation Drainage Report 1 .0 General Location and Description Tri-State Generation and Transmission (TSGT) in coordination with Del-Mont Consultants, Inc. (DMC) is in the process of designing a new substation yard . The scope of work includes the construction of the substation yard , driveway, installation of new perimeter and property fence, and the addition of high voltage electrical equipment and facilities. The purpose of this report is to prevent the findings from the hydrologic analysis that was performed on the existing property as well as the proposed substation yard . 1 .1 Site Location The proposed substation yard is located on a 21 .6 acre parcel owned by TSGT situated in Section 22, Township 2 North , Range 65 West, 6th Principal Meridian in Weld County, Colorado. The substation site is accessed on a dirt road that parallels what would be County Road 45 approximately 0.7 miles north of County Road 18. 1 .2 Site Description The site naturally drains from west to east and south to north and is covered by native vegetation and weeds. Site layout details will be discussed in more detail in Section 2. The site receives run on from the south and west from the neighboring property. The old, abandoned Neres Canal runs through the site. The Beebe Seep Canal is located approximately 07 miles to the north-west and is the only nearby water feature. Given the distance to the nearest water feature, the site is not located within a floodplain . There are no developments on or near the site. m€ Colfer Substation Drainage Report 1 -1 2.0 Drainage Basins and Sub-Basins The property functions overall as three drainage basins leaving the property flowing to the North, East, or South East. Water leaving the site in all directions will flow overland through various paths/swales and eventually enter the Beebe Seep Canal. Both existing and proposed conditions produce several smaller sub-basins. These sub-basins will be discussed in detail in the following sections. 2.1 Existing Drainage Sub-Basins The existing site is divided into three different sub-basins; North West, Central, and South East. A map illustrating the delineation of the sub-basins can be found in Appendix A. The North West sub-basin discharges to the property to the North West. The Central sub-basin discharges to the property to the North East. The South East sub-basin discharges to the property to the east. There is currently no development present on the neighboring property. Table 2-1 presents the sub-basins and their corresponding acreages. Table 2-1 : Existing Sub-Basin Acreages Sub-Basin Total Area (Acres) North West 3.04 Central 14.52 South East 4.07 2.2 Proposed Drainage Sub-Basins The proposed site is divided into five different sub-basins; North West, Substation Yard North, Substation Yard South , Central , and South East. A map illustrating the delineation of the sub-basins can be found in Appendix A. The North West sub-basin is reduced by the installation of the substation yard . Flow leaving the North West area matches historical drainage patterns. The Central area now contains the access driveway and flow in this sub- basin continues to match historical discharge patterns. The Substation Yard drains to an interior trench drain system that discharges to rip-rap channels, ultimately discharging to the detention pond. The detention pond discharges to the Central area and matches historical discharge patterns. The South East sub-basin is unaffected and is the same as existing conditions. Table 2-2 presents the proposed sub-basins and their corresponding acreages. Coffer Substation Drainage Report 2-1 Table 2-2: Proposed Sub-Basin Acreages Total Area Sub-Basin 1 (Acres) North West 2.21 Central 10.89 Substation Yard North 2.59 Substation Yard South 1 .89 South East 4.07 DWGColfer Substation Drainage Report 2-2 3.0 Drainage Design Criteria 3.1 Methodology The hydrologic/hydraulic analysis of the site was performed using the Autodesk Storm and Sanitary analysis utilizing the SWMM engine platform model for a 10 year, 1 hour rainfall event and a 100 year, 1 hour rainfall event per Weld County Standards. The Curve Number method of determining rainfall losses due to infiltration was used. Runoff for all site conditions was computed for both the 10 year and 100 year, 1 hour storms. Rainfall depths were obtained for the region from NOAA Atlas 14, Volume 8, Version 2 and rainfall distribution curves were developed using a 1 -hour rainfall distribution. Modeling results are presented in Appendix D. The Urban Drainage Stormwater Best Management Practice Design Workbook was utilized in conjunction with the Weld County Water Quality Feature Calculation Spreadsheet to determine the required water quality capture volume (WQCV) and to design the outlet structure. The spreadsheets/worksheets can be found in Appendix C and are discussed in more detail in Section 4.0. Soil data was obtained from a USDA Soils Report, and gives a hydrologic soil group A for the site. The soils report is included in Appendix B. The described methods/tools used in the analysis, are in accordance with Weld County's storm drainage criteria. 3.2 Land Cover Hydrologic Properties Curve numbers and corresponding Manning's N values, for hydrologic soil group A, were assigned to the various land cover types found on the project, both existing and proposed , and are presented in Table 3-1 . Table 3-1 : Land Cover Hydrologic Properties Land Cover Type Curve Number Manning's N Pasture or Range Land, Poor 68 0. 15 Condition (Existing Site) Open Graded Aggregate Topping Over Compacted Base (Substation 76 0.024 Yard) Compacted Base Material 78 0.024 (Driveways) Pavement/Concrete 98 0.015 3.3 Weighted Design Values Utilizing the land cover hydrologic properties presented above, a weighted curve number and Manning's N value was calculated for each of the sub-basins, presented in Section 2.0 to be used for analysis. Table 3-2 presents the weighted design values for existing conditions and Table 3-3 presents the weighted design values for proposed conditions. Detailed calculations can be found in Appendix C. 3-1 Colfer Substation Drainage Report Table 3-2: Existing Sub-Basin Weighted Design Values Total Area Weighted Weighted Sub-Basin (Acres) Manning's N Curve Number North West 3.04 0. 15 68 Central 14.52 0. 15 68 South East 4.07 0. 15 68 Table 3-3: Proposed Sub-Basin Weighted Design Values Total Area Weighted Weighted Sub-Basin (Acres) Manning's N Curve Number North West 2.21 0. 150 68 Central 10.89 0. 148 68.2 Substation Yard- North 2.59 0.024 76 Substation Yard-South 1 .89 0.024 76 South East 4.07 0.15 68 3-2 Ulvt�' Golfer Substation Drainage Report 4.0 Drainage Facility Design 4.1 Historical Drainage Per Weld County requirements, the historical discharge rate from the 10 year — 1 hour storm shall be utilized to determine the allowable discharge rate for the proposed improvements assuming the existing site has 2% imperviousness. Values presented in Table 3-2 were P used in the model to calculate a historical discharge rate for all three existing sub-basins. Table 4-1 presents the discharge rates for the existing sub-basins for both the 10-year and 100-year 1 -hour storm events. Table 4-1 : Existing Sub-Basin Discharge ge Values 10-Year 100-Year Sub-Basin Discharge Discharge (CFS) (CFS) North West 0.53 3.84 Central 1 .57 13.01 South East 0.61 4.60 4.2 Proposed Drainage Values presented in Table 3-3 were utilized in the model to calculate the runoff for the proposed conditions as well as to size the outlet structure and detention pond . Only runoff from the substation yard will be routed through the detention pond and outlet structure. Runoff from the North West and South East sub-basins will continue to follow historical discharge locations. The Central area will he directed under the ririvewav leading the property to the north , following historical discharge patterns. The detention pond has been designed to provide the required WQCV and 100-year 1 -hour storm detention. Based on the design , the pond has a stage-storage relationship that is represented in Table 4-2. Table 4-2: Detention Pond Stage-Storage Table Elevation Surface Area (Sq. Ft.) 4897 7,281 4898 20,440 4899 22,862 4900 25,384 Utilizing the Weld County Water Quality Feature Calculation spreadsheet, the imperviousness of the site was calculated to be 10.2% which required a water quality capture volume of 0. 123 acre-feet. Utilizing the imperviousness, site characteristics, and pond geometry, the required WQCV, according to Urban Drainage, was calculated to be 0. 137 acre-feet. In an effort to be conservative, the value obtained from the Urban Drainage calculations was used for design of the outlet structure. The Urban Drainage Design 4-1 ti Golfer Substation Drainage Report Procedure Form for Extended Detention Basins spreadsheet was utilized to design the outlet structure to not only retain the correct WQCV but to also discharge at or less than the required historic discharge rate presented in Table 4-1 . The spreadsheet showing the detailed calculations can be found in Appendix C. The design of the outlet structure is detailed in the grading drawings provided in Appendix A. The model of the proposed site conditions was utilized to calculate discharge flow rates from the substation site in order to size the interior drain lines. Table 4-3 presents the hydraulic capacity of the interior drain line system and the required capacity to discharge flow from the substation yard . Detailed design of the interior drain lines is provided in Appendix A. Table 4-3: Interior Drain Line Hydraulic Capacity Pipe Diameter Total Capacity Required Flow Remaining Drainage Feature (in) (cfs) Capacity (cfs) Capacity (cfs) North Discharge Pipe 18 16.29 7.46 8.83 South Discharge Pipe 18 10.97 5.54 5.43 Table 4-4 presents the discharge rates for the proposed sub-basins for both the 10-year and 100-year 1 -hour storm events. Table 4-4: Proposed Sub-Basin Discharge Values i 10-Year 100-Year Sub-Basin Discharge Discharge _ (CFS) (CFS) North West 0.53 3.41 Central 1 .20 9.84 Substation Yard-North 2.28 7.46 Substation Yard-South 1 .82 5.54 South East 0.61 4.60 Utilizing the flow rates from the substation yard presented above, the model was also utilized to verify the detention pond design. With the addition of the outlet structure, the pond provided the WQCV of 0. 137 Acre-feet at a depth of 0.5 feet and resulted in a 100-year storm depth of 1 . 14 feet. This allows approximately 1 .86 additional feet of freeboard in the pond , exceeding the required 1 foot according to the Weld County Code. The Substation Yard-North and Substation Yard-South sub basins drain to the pond which discharge to the Central sub-basin. Combined discharge from the pond and Central area are presented in Table 5-1 . 4-2 Golfer Substation Drainage Report 5.0 Conclusions 5.1 Drainage Concept The drainage design has been prepared using sound engineering judgement and practices and will provide an effective means of controlling runoff on the project site as well as protect the site from damage. The design has been completed according to Weld County Code and will result in no downstream impacts to any people or structures. Historic flow paths, discharge rates, and water quality have been maintained. 5.2 Compliance with the Weld County Code Per Weld County requirements, the historical discharge rate from the 10 year — 1 hour storm shall be utilized to determine the allowable discharge rate for the proposed improvements. To demonstrate compliance with this requirement, both the existing and proposed conditions were combined into the three original overall sub-basins; North West, Central , and South East. Table 5-1 presents the overall peak discharge rates for the three sub-basins. Table 5-1 : Overall Sub-Basin Discharge Values r 10-tear Discharge 1O0-Year Discharge Sub-Basin (CFS) (CFS) Existing Proposed Existing Proposed North West 0.53 0.53 3.84 3.41 Central 1 .57 1 .2 13.01 9.83 South East 0.61 0.61 4.60 4.60 Total 2.71 2.34 21 .45 17.84 Table 5-1 illustrates the proposed condition discharge rate is less than the required discharge rate from the 10-year, 1 -hour storm event, resulting in compliance with the Weld County Code. As discussed in previous sections, the detention pond has also been designed to meet all criteria set forth in the Weld County Code. NC. 5-1 Colfer Substation Drainage Report 6.0 References United States Department of Agriculture Natural Resources Conservation Service. Web Soil Survey Urban Drainage and Flood Control District. Storm water Best Management Practice Design Workbook, Version 3.03, December 2013. Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volume 1-3, June 2001 . Weld County. Weld County Water Quality Feature Calculation Spreadsheet Weld County Code. Weld County, Colorado, September 6, 2008. Weld County Engineering and Construction Criteria. Weld County Public Works Department, April 2012. NOAA Atlas 14, Volume 8, Precipitation-Frequency Atlas of the United States. U.S. Department of Commerce, 2013. DMCColfer Substation Drainage Report 6-1 I Appendix A Site Maps & Design Drawings �° Colfer Substation Drainage Report V ` vC11:19\911 sac n' 9%0241 MO SMO SNISVEI ens 031ONSV SMO SNOIJICNOO ONI±SIXS :.a . . r r. „i i tin I i• NOtld1S8f1S 835100 • 3NI'NOISSMSNVLLL 9 N0I1VN3N39 31V1SIW. • • t o L i^� r n V U) LLJ \\I%) H fY if I. I-- I- (f) 0 W •M•Ode"a I LI lilt-n Y.btl,ndSMara kin•..ant_0Y teen.'UVY1•V:SOWS•.ojy1J_L•.flee..R- •X11/aMI.OLIPart•LV•NIY.•••••-1_.a:-a 'L:al.SSA •• 1•. 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Ji M }RV I .. yid I 1r s / 1 ��r li na J z ,t I 1--- 2 • I Appendix B NRCS Soils Report Dmv Colfer Substation Drainage Report USDA United States A product of the National Custom Soil Resource '`�'r Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for n I States Department of I \I RC Agriculture and other v Federal agencies, State We I d Count Natural agencies including the C o l o ra d o Resources Agricultural Experiment , Conservation Stations, and local Service participants Southern Part Colfer Substation 7 !. • I • _WC P.' - I • 0 r. ' s . _ - •b. 1. r• . •L11 . -La_ , L i 8.000 f t 0 June 1 , 2015 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal. State. and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning , onsite investigation is needed to supplement this information in some cases. Fxamples include soil quality assessments (http://www.nres.usda.gov/wps/portal/ nres/mJain/soils/health/) and certain conservation and engineering applications. For more r♦eta !e d r.-.fom-.3tic contcct Ur !.cc� 1 10 � G Cc' ILGI tl Ill�.1.11 offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactusO cid=nres142p2_053951 ). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U .S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion , sexual orientation, genetic information , political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means 2 for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 7 Soil Map 8 Legend 9 Map Unit Legend 10 Map Unit Descriptions 10 Weld County, Colorado, Southern Part 12 49-Osgood sand, 0 to 3 percent slopes 12 69—Valent sand, 0 to 3 percent slopes 13 70—Valent sand, 3 to 9 percent slopes 14 References 17 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil scientists classified and named the soils in the survey area, they compared the 5 Custom Soil Resource Report individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil- landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented . Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other Properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. 6 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. 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Q 0 Custom Soil Resource Report Map Unit Legend Weld County, Colorado, Southern Part (CO618) Map Unit Symbol Map Unit Name Acres in A0I Percent of AO1 49 Osgood sand, 0 to 3 percent 3.4 16.2% slopes 69 Valent sand, 0 to 3 percent 2.9 14.1 % slopes 70 Valent sand, 3 to 9 percent 14.5 69.6% slopes Totals for Area of interest 20.8 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or Iandform segments that have similar use and management requirements. The delineation of such segments 10 Custom Soil Resource Report on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar_ Alpha- Beta association , 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform, An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example_ 11 Custom Soil Resource Report Weld County, Colorado, Southern Part 49—Osgood sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 362x Elevation: 4,680 to 4,900 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 46 to 55 degrees F Frost-free period: 140 to 150 days Farmland classification: Farmland of statewide importance Map Unit Composition Osgood and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Osgood Setting Landform: Plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Eollan sands Typical profile Hi - 0 to 22 inches: sand H2 - 22 to 34 inches: sandy loam H3 - 34 to 60 inches: sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): High (2.00 to 6.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water storage in profile: Low (about 4.8 inches) interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: A Ecological site: Deep sand (R067BY015CO) Minor Components Valent Percent of map unit: 10 percent Dailey Percent of map unit: 5 percent 12 Custom Soil Resource Report 69—Valent sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 2tczd Elevation: 3,850 to 5,210 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost-free period: 130 to 180 days Farmland classification: Farmland of local importance Map Unit Composition Valent and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Valent Setting Landform: Interdunes Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Linear Parent material: Noncalcareous eolian sands Typical profile A - 0 to 5 inches: sand AC - 5 to 12 inches: sand Cl - 12 to 30 inches: sand C2 - 30 to 80 inches: sand Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Negligible Capacity of the most limiting layer to transmit water (Ksat): High to very high (6.00 to 20.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 1 percent Salinity, maximum in profile: Nonsaline (0.0 to 1 .9 mmhos/cm) Available water storage in profile: Very low (about 2.4 inches) Interpretive groups Land capability classification (irrigated): 4s Land capability classification (nonirrigated): 7s Hydrologic Soil Group: A Ecological site: Deep sand (R067BY015CO) 13 Custom Soil Resource Report Minor Components Dailey Percent of map unit: 5 percent Landform: Interdunes Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Concave Ecological site: Deep sand (R067BY015CO) Julesburg Percent of map unit: 5 percent Landform: Interdunes Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Linear Ecological site: Sandy plains (R067BY024O0) Vnna Percent of map unit 5 percent Landform: Interdunes Landform position (two-dimensional): Toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Linear Ecological site: Sandy plains (R067BY024CO) 70--Valent sand, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 2tczf Elevation: 3,050 to 5, 150 feet Mean annual precipitation: 12 to 18 inches Mean annual air temperature: 48 to 55 degrees F Frost-free period: 130 to 180 days Farmland classification: Not prime farmland Map Unit Composition Valent and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Valent Setting Landform: Hills, dunes Landform position (two-dimensional): Backslope, shoulder, footslope, summit Landform position (three-dimensional): Side slope, head slope, nose slope, crest 14 Custom Soil Resource Report Down-slope shape: Linear, convex Across-slope shape: Linear, convex Parent material: Noncalcareous eolian sands Typical profile A - 0 to 5 inches: sand AC - 5 to 12 inches: sand Cl - 12 to 30 inches: sand C2 - 30 to 80 inches: sand Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Excessively drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): High to very high (6.00 to 39.96 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 1 percent Salinity, maximum in profile: Nonsaline (0.0 to 1 .9 mmhos/cm) Available water storage in profile: Very low (about 2.4 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: A Ecological site: Sands (north) (pe 16-20) (R072XA021 KS) Minor Components Dailey Percent of map unit 10 percent Landform: Interdunes Landform position (two-dimensional): Footsiope, toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Concave Ecological site: Sandy (north) draft (april 2010) (pe 16-20) (R072XA022KS) Haxtun Percent of map unit: 5 percent Landform: Interdunes Landform position (two-dimensional): Footslope, toeslope Landform position (three-dimensional): Base slope Down-slope shape: Linear Across-slope shape: Concave Ecological site: Sandy (pe16-20) (south) (formerly sandy, ks - sandy plains, co) (R072XY022KS) Vona Percent of map unit: 5 percent Landform: Hills Landform position (two-dimensional): Footsiope, backsfope, shoulder Landform position (three-dimensional): Side slope, head slope, nose slope, base slope 15 Custom Sod Resource Report Down-slope shape: Linear Across-slope shape: Linear Ecological site: Sandy plains (R067BY024CO) 16 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin , L.M. , V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U .S. Fish and Wildlife Service FWS/O BS-79/31 . Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M . Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U,S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/nres/ detail/national/soils/?cid=nres142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U .S. Department of Agriculture Handbook 436. http://www.nres.usda.gov/wps/portal/ nrcs/detail/national/soils/?cid=nrcs142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http://www.nrcs.usda.gov/wps/ portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W. , Jr. 1985. Wetlands of Delaware. U .S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1 . United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepasture/?cid=stelprdb 1043084 17 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres 142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U .S. Department of Agriculture Handbook 296. p http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nrcs142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961 . Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/lnternet/FSE_DOCUMENTS/nres142p2_052290.pdf 18 Appendix C Site Specific Physical Design Properties Dmc. Colfer Substation Drainage Report Coffer Drainage Design Existing Conditions Total Area Area Name (sf) (acres) Flow length Width (AM Slope (%) NorthWest 132631 3.04 300 442.1033333 3.5 Central 632664 14.52 500 1265 328 2.S SouthEast 177208 4.07 400 443 02 4 Land Cover Type Curve Number Mannings N D-Store Pervious ' Pasture or Range Land, Poor Condition 68 0.15 0.15 Open Graded Aggregate Topping Over Compacted Base 76 0.024 0.05 Compacted Base Material 78 0.024 0 Pavement/Concrete 98 0.015 0 Roughness Coefficient and Curve Number Analysis North West Description Total Area lac) Manning's 'n' An CN A"CN Native 3 04 0 15 0 4567 68 207 0456 0 015 0.0000 98 0-0000 0 0.0000 0 0.0000 sum 0 4567 207 0456 Total Area (ac) 3.045 Weighted 0 15 68 Weighted Manrdng's 'ii' 0.150 Weighted Curve Number 68 Osto►e Pervious (in) 0.15 Central Description Total Area (ac) Manning's 'n' Mn CN A"CN Native 14.52 0.15 2.1786 68 987.6298 0 015 0.0000 98 0-0000 0 024 0.0000 87 0 0000 sum 2 1786 987 6298 Total Area(at) 14324 Weighted 0 15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 (Dstore Pervious (in) 0.15 SouthEast Description Total Area lac) Manning's'n' Mn CN A*CN Native 4,07 0.15 0.6102 68 276.6332 0 015 0.0000 98 0.0000 0 024 0.0000 87 0.0000 sum 0.6102 276.6332 Total Area (at) 4.068 Weighted 0.15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 Dstore Pervious (In) 0.15 Colfer Drainage Design Proposed Conditions Total Area Area Name (s() (acres) Flow Length Width (A/L) Slope (%) NorthWest 96050 2.21 175 548 8571429 3 5 Central 474376 10.89 500 948.752 2.5' Substation Yard North 112618 2.59 175 643.5314286 1 Substation Yard South 82249 1.89 125 657.992 1 SouthEast 177208 4,07 400 443.02 4. Land Cover Type Curve Number Mannings N D-Store Pervious Pasture or Range Land, Poor Condition 68 0.15 0 15 Open Graded Aggregate Topping Over Compacted Base 76 0 024 0.05 Compacted Base Material 78 0.024 0 Pavement/Concrete 98 0.015 0 Roughness Coefficient and Curve Number Analysis NorthWest Description Total Area (ac) Manninz'sW Mn CN A*CN Native 2 21 0.15 0.3308 68 149.9403 sum 0.3308 149 9403 Total Area (ac) 2.205 Weighted 0 15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 Dstore Pervious (in) 0.15 Central Description Total Area (ad Mannintt's 'n' Mn CN A*CN Native 10.69 0.15 1.6034 58 726.8725 Driveway 0 20 0.024 0.0048 78 15.6680 0.024 0.0000 87 0.0000 sum 1.6082 742.5406 Total Area (ac) 10.890 Weighted 0.147675894 68.18445284 Weighted Manning's 'n' 0.148 Weighted Curve Number 68.18 Dstore Pervious (in) 0.15 Substation Yard North Description Total Area (act ManninR's'n' Mn CN A*CN Substation yard and apron 2 59 0.024 0.0670 76 196.4869 sum 0.0620 196.4869 Total Area (ac) 2.585 Weighted 0.024 76 Weighted Manning's 'n' 0.024 Weighted Curve Number 76 Dstore Pervious (in) 0.15 Substation Yard South Description Total Area (ac) Manning's Int A*n CN A*CN Substation yard and apron 1.89 0.024 0.0453 76 143.5015 sum 0.0453 143.5015 Total Area (ac) 1.888 Weighted 0 024 76 Weighted Manning's 'n' 0.024 Weighted Curve Number 76 Dstore Pervious (in) 0.15 SouthEast Descrihuon Total Area LK) Manning's 'n' A*n CN A*CN Narivr 4 07 0.15 0.6102 68 276.6332 sum 0.6102 276.6332 Total Area (ac) 4.068 Weighted 0.15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 Dstore Pervious (in) 0.15 Water Quality Feature Calculations Weld County Planning Services/Engineering Date ######## Enter Project Name : Coffer Substation Enter Case Number: Surface Area (SF) Area (acres) % Impervious i 0 Roof 0 0.00 90% 0.9 Paved 0 0.00 100% 1 .0 Gravel/Crushed Asphalt 203,617 4.67 40% 0.4 Grass/Undeveloped 16.96 2% 0.02 Total Site (Acres) 1 21.637) Note: 1 ac = 43,560 sf Weighted Imperviousness (i) = 0.102 WOCV=a'(0.91 i 3-1. 19j z +0 78,) 6-hr drain tzme a = 0.7 t 2-h; drain time a = 0.8 24-hr drain tmie a = 0.9 40-hr drain Nile a = I 0 Water Quality Calulation Volume (WQCV) = 0.0682 r wocv Required storage =1 — (Ai ea) I 12 Required storage = 0.1230 acre*feet 5,356 cu ft Design Procedure Form: Extended Detention Basin (EDB) Sheet 1 of 4 Designer: David Schieldt Company: Del-Mont Consultants, Inc. Date: June 11, 2015 Project: Coffer Substation Location: Hudson, Co 1. Basin Storage Volume A) Effective Imperviousness of Tributary Area, la la = 10.2 ok B) Tributary Area's Imperviousness Ratio (i = la/ 100 ) I = 0.102 C) Contributing Watershed Area Area = 21.637 ac D) For Watersheds Outside of the Denver Region, Depth of Average d6= 0.40 in Runoff Producing Storm Choose One E) Design Concept (Select EURV when also designing for Hood control) • Water Quality Capture Volume (WQCV) 0 Excess Urban Runoff Volume (EURV) F) Design Volume (1.2 WQCV) Based on 40-hour Drain Time ✓DESIGN= 0.147 ac-ft (VUESIGN = (1.0 * (0.91 • V- 1.19 ' ✓+ 0.78 ' i) / 12 • Area ' 1.2) G) For Watersheds Outside of the Denver Region, VOESIGN OTHER= 0.137 ac-ft Water Quality Capture Volume (WQCV) Design Volume (VwOCV OTHER = (ds'(Vossion/0.43)) H) User Input of Water Quality Capture Volume (WQCV) Design Volume VDCSIGN USER= ac-ft (Only if a different WQCV Design Volume is desired) Choose One I) Predominant Watershed NRCS Soil Group Iho A Og QC/ D - 2. Basin Shape: Length to Width Ratio L : W = 2.0 1 (A basin length to width ratio of at least 2:1 will improve TSS reduction.) 3. Basin Side Slopes A) Basin Maximum Side Slopes Z = 4 00 ft /ft (Horizontal distance per unit vertical, 4:1 or flatter preferred) 4 Inlet A) Describe means of providing energy dissipation at concentrated inflow locations: 15067 - Caller Detention Pond Sizing_UD-BMP, EDB 6/11/2015, 12:19 PM IDesign Procedure Form: Extended Detention Basin (EDB) Sheet 2 of 4 Designer: David Schieldt Company: Del-Mont Consultants, inc. Date: June 11, 2015 Project: Colter Substation Location: Hudson, Co 5. Forebay A) Minimum Forebay Volume VFMIN = 0.002 ac-ft ' (VFMIN = 2% of the WQCV) 1 !I B) Actual Forebay Volume VF = ac-ft C) Forebay Depth DF = in ,. (DF = 18 inch maximum) I O) Forebay Discharge «. i' i)Undetained 100-year Peak Discharge Ono= cfs ii) Forebay Discharge Design Flow OF= cfs (QF - 0.02 ' Qloo) E) Forebay Discharge Design Choose One Q Berm With Pipe (flow too small for berm wl pipe) Q Wall with Red. Notch O Wall with V-Notch Welr IF) Discharge Pipe Size (minimum 8-inches) Calculated Dp = in G) Rectangular Notch Width Calculated WN = in ChsM.C Ow: 6. Trickle Channel IS Concrete A) Type of Trickle Channel Q Soft Bottom l'hi F) Slope of Trickle Channel S = 0.0050 ft /ft T Mlcropool and Outlet Structure A) Depth of Micropool (2 5-feet minimum) D . = 0 5 fl MIN DEPTH AF 7 c FFFT ir- B) Surface Area of Mlcropool (10 112 minimum) AM = 10 sq ft No micropool Site grading does not allow. C) Outlet Type Choose One IS Orifice Plate Q Other (Describe): D) Depth of Design Volume (EURV or 1.2 WQCV) Based on the Design H = 0.50 feet Concept Chosen Under 1.E. E) Volume to Drain Over Prescribed The WQCV = 0.114 ac-ft F) Drain Time To = 40 hours (Min To for WQCV= 40 hours; Max To for EURV= 72 hours) G) Recommended Maximum Outlet Area per Row, (A0) A, = 0.58 square inches H) Orifice Dimensions: i) Circular Orifice Diameter or Dcnrce= 13 11 6 inches I) Number of Columns n� = 1 number J) Actual Design Outlet Area per Row (A ) A, = 0.52 square inches K) Number of Rows (nr) n, = 1 number L) Total Outlet Area (As) A,1 = 0.8 square inches 15067 - Golfer Detention Pond Sizing_UD-BMP, EDB 6/11/2015, 12:19 PM Design Procedure Form: Extended Detention Basin (EDB) Sheet 3 of 4 Designer: David Schieldt Company: Del-Mont Consultants, Inc. Date: June 11, 2015 Project: Coffer Substation Location: Hudson, Co 8. Initial Surcharge Volume A) Depth of Initial Surcharge Volume Dm = 6.0 in (Minimum recommended depth Is 4 Inches) C) Initial Surcharge Provided Above Micropool Vs _ ;6,9. , cu ft cnoos one 9. Trash Rack it Circular(up to 1-1/4" diameter) A) Type of Water Quality Orifice Used Q Circular(greater than 1-1/4" diameter) OR Rectangular(2" high) B) Water Quality Screen Open Area: A, = Aot " 38.51e-0095D) Ai • 2Q • • square Inches C) For 1-1/4", or Smaller, Circular Opening (See Fact Sheet T-12): I) Width of Water Quality Screen and Concrete Opening (W wig) W„pE„,y= 12.0, inches ii) Height of Water Quality Screen (Fire) HTR = • 10.0 Inches Choose One iii) Type of Screen, Describe if "Other" Q S.S. Well Screen with 60% Open Area* Q Other (Describe): Choose One O Aluminum Amico-Klemp SR Series(or equal) Q Other(Describe): . . Inches 15067 - Caller Detention Pond Sizing_UD-BMP, EDB 6111/2015, 12:19 PM Design Procedure Form: Extended Detention Basin (EDB) Sheet 4 of 4 Designer: David Schieldt Company: Del-Mont Consultants, Inc. Date: June 11, 2015 Project: Colter Substation Location: Hudson, Co 10. Overflow Embankment A) Describe embankment protection for 100-year and greater overtopping: B) Slope of Overflow Embankment Z1 = ft / ft (Horizontal distance per unit vertical, 4:1 or flatter preferred) (twice One 11. Vegetation f�Irrigated Not Irrigated 12. Access A) Describe Sediment Removal Procedures Notes: 15067 - Colter Detention Pond Sizing_UD-BMP, EDB 6/11/2015, 12:19 PM Appendix D SWMM Modeling Results Colfer Substation Drainage Report Coffer Substation - Existing Conditions - 10 Year 1 Hour Project Description File Name Colfer Existing.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Jun 01, 2015 00:00:00 End Analysis On Jun 04, 2015 00:00:00 .. Start Reporting On Jun 01, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Oty Rain Gages 1 Subbasins 3 Nodes 3 Junctions 0 Outfalls 3 Flow Diversions 0 Inlets . 0 Storage Nodes 0 Links 0 Channels 0 Pipes 0 Pumps 0 Orifices 0 Weirs 0 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (Inches) 1 Rain Gage-01 Time Series 10 YR • 1 HR Cumulative inches Colorado Weld 10 1.39 Florida DOT 1-hr Page 1 of 9 Colter Substation - Existing Conditions - 10 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (in) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Central 14.52 2.00 68.00 2.5000 1265.00 0.0150 0.1500 1.39 1.2380 0.10 1.51 1 .57 0 00:32:50 2 NorthWast 3.05 2.00 68.00 3.5000 442.00 0.0150 0.1500 1.39 1.2170 0.13 0.38 0,53 0 00:21:50 3 SouthEast 4.07 2.00 68.00 4.0000 443,00 0.0150 0.1500 1.39 1.2240 0.12 0.48 0.61 0 00:24:56 Page 2 of 9 Coffer Substation - Existing Conditions - 10 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (It) Ott) (cis) (It) (ft) (ft) (days hh:mm) (ac-in) (min) 1 CentralOut Outfall 4895.00 0.00 0.00 2 NorthWestOut Outfall 490(100 0.00 0.00 3 SouthEastOut Outfall 4894.00 0.00 0.00 II Page 3 of 9 Colter Substation - Existing Conditions - 10 Year 1 Hour Subbasin Hydrology Subbasin : Central Input Data Area (ac) 14.52 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope r/o) 2.5000 Equivalent Width (ft) 1265.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 14.52 - 68.00 Composite Area & Weighted CN 14.52 68.00 Subbasin Runoff Results Total Rainfall (in) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2380 Total Runoff (in) 0.10 Peak Runoff (cfs) 1.57 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:32:50 Page 4 of 9 Coffer Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Central Rainfall Intensity Graph 3 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 -c 17 _c 16 ;.1 m 1.5 c 1 .4 a 1.3 1 .2 1 .1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 171 16 15 1 14 13 1 .2 11 1 0, 09 c 08 z 07 06 05 0.4 03 02 01 k_ 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 5 of 9 Coffer Substation - Existing Conditions - 10 Year 1 Hour Subbasin : NorthWest Input Data Area (ac) 3.05 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (In/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 3.5000 Equivalent Width (ft) 442.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness ..... . 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 3.05 - 68.00 Composite Area & Weighted CN 3.05 68.00 Subbasin Runoff Results Total Rainfall (in) 1.39 Total Runon (In) 0.00 Total Evaporation (in) 0,0000 Total Infiltration (in) 1.2170 Total Runoff (In) 0.13 Peak Runoff (cfs) 0.53 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:21:50 Page 6 of 9 Colter Substation - Existing Conditions - 10 Year 1 Hour Subbasin : NorthWest Rainfall Intensity Graph 3.1 3 f 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 I9 t8 1 7 16 Ta I5 c 14 Ix 1 3 12 11 1 09 08 07 06 05 04 03 0.2 01 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 0 54 I 0 52 05 0 48 0 46 0 44 0 42 04 038 036 0 34 032 7 03 0 28 S 0.26 rY 0 24 an 0.2 018 0.16 0 14 0 12 01 0 08 0 06 004 0 02 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 7 of 9 Coffer Substation - Existing Conditions - 10 Year 1 Hour Subbasin : South East Input Data Area (ac) 4.07 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity(in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 4.0000 Equivalent Width (ft) 443.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area SoII Curve Soil/Surface Description (acres) Group Number 4.07 - 68,00 Composite Area & Weighted CN 4.07 68.00 Subbasin Runoff Results Total Rainfall (in) . 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2240 Total Runoff (in) 0.12 Peak Runoff (cfs) 0.61 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:24:56 Page 8 of 9 Coffer Substation - Existing Conditions - 10 Year 1 Hour Subbasin : SouthEast Rainfall Intensity Graph 31 3 29 28 27 2.6 25 24 23 22 21 2 19 "-. 1 8 L C 1 7 1 .6 m 15 g 1.4 re 1.3 12 1 , 1 1 0.9 I 0.8I 0.7 I 0.6 0.5 0.4 0.3 0.2 0.1 0 5 10 15 20 25 30 35 40 46 50 55 60 65 70 Time (hrs) Runoff Hydrograph 0 62 06 058 056 0 54 0.52 05 0 48 046 0 44 0.42 04 0.38 „ 036 fj 0.34 0.32 0 0.3 C 0 0.28 0_ 0.26 1 0.24 022 0.2 0 18 0 16 0 14 0 12 01 0 08 0 06 0 04 002 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 9 of 9 Colfer Substation - Existing Conditions - 100 Year 1 Hour Project Description File Name Golfer Exlsting.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Jun 01, 2015 00:00:00 End Analysis On Jun 04, 2015 00:00:00 Start Reporting On Jun 01, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 3 Nodes 3 Junctions .,.. 0 Outfalls 3 Flow Diversions 0 Inlets - 0 Storage Nodes 0 Links 0 Channels 0 Pipes ..... .., 0 Pumps 0 Orifices .... ........_...... 0 Weirs 0 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain Stale County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (inches) 1 Rain Gage-01 Time Series 100 YR - 1 HR Cumulative inches Colorado Weld 10 2.65 Florida DOT 1-hr Page 1 of 9 Coffer Substation - Existing Conditions - 100 Year 1 Hour Subbasin Summary SW Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (C) I%) (%) (ft) (in) (In) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Central 14.52 2.00 68.00 2.5000 1265.00 0.0150 0.1500 2.65 1.9140 0.69 10.01 13.01 0 00:25:21 2 NorthWest 3.05 2.00 68.00 3.5000 442.00 0.0150 0.1500 2.65 1.8610 0.74 2.25 3.84 0 00:16:52 3 SouthEast 4.07 2.00 68.00 4.0000 443.00 0.0150 0.1500 2.65 1.8780 0.73 2.95 4.60 0 00:19:15 I • Page 2 of 9 Coffer Substation - Existing Conditions - 100 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time 10 Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) (It') (cis) (It) (ft) (ft) (days hh:mm) (ac-in) (min) 1 CentralOut Outfall 4895.00 0.00 0.00 2 NorthWestOut Outfall 4900.00 0.00 0.00 3 SouthEastOut Outfall 4894.00 0.00 0.00 Page 3 of 9 Colter Substation - Existing Conditions - 100 Year 1 Hour Subbasin Hydrology Subbasin : Central Input Data Area (ac) 14.52 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 1265.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness .. .. .. .......... .. . 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 14.52 - 68.00 Composite Area & Weighted CN 14.52 68.00 Subbasin Runoff Results Total Rainfall (in) 2.65 Total Runon (in) 0.00 Total Evaporation (in) .. 0.0000 Total Infiltration (in) 1.9140 Total Runoff (in) 0.69 Peak Runoff (cfs) 13.01 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:25:21 Page 4 of 9 Coffer Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Central Rainfall Intensity Graph 58 56 54 52 5 48 46 44 42 4 38 3.6 34 c 32 L=- 3 ea 28 26 co 0_ 2 4 22 2 18 16 14 12 1 08 06 04 02 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 135 13 125 12 115 11 10.5 10 95 9 85 75 U � 7 0 6.5 6 55 5 45 4 35 3 25 2 15 1 05 i 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 6 of 9 Coffer Substation - Existing Conditions - 100 Year 1 Hour Subbasin : NorthWest Input Data Area (ac) 3.05 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 3.5000 Equivalent Width (ft) 442.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness...._.. ,. .. ...... . 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Sal/Surface Desaiption (acres) Group Number 3105 - 68.00 Composite Area & Weighted CN 3.05 68.00 Subbasin Runoff Results Total Rainfall (In) 2.65 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (In) 1.8610 Total Runoff (in) 0.74 Peak Runoff (cfs) 3.84 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:16:52 Page 6 of 9 Colter Substation - Existing Conditions - 100 Year 1 Hour Subbasin : NorthWest Rainfall Intensity Graph 62 6 58 56 54 52 5 48 46 44 4.2 4 38 36 L 34 3 2 iv 3 c 28 [PC 2 6 24 22 2 18 16 1 .4 12 1 08 06 04 02 . 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 4 3B 36 34 32 3 2.8 26 24 2.2 2- 0 0± 1,8 16 14 121 1 00 06 04 021 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 7 of 9 Coffer Substation - Existing Conditions - 100 Year 1 Hour Subbasin : SouthEast Input Data Area (ac) 4.07 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 4.0000 Equivalent Width (ft) 443.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness ._... ... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Sod/Surface Description (acres) Group Number 4.07 - 68.00 Composite Area & Weighted CN 4.07 68.00 Subbasin Runoff Results Total Rainfall (in) 2.65 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.8780 Total Runoff (in) 0.73 Peak Runoff (cfs) 4.60 Weighted Curve Number .... 68.00 Time of Concentration (days hh:mm:ss) 0 00:19:15 Page 8of9 Colter Substation - Existing Conditions - 100 Year 1 Hour Subbasin : South East Rainfall Intensity Graph 6.2 6 58 5.6 9 54 52 5 48 46 44 42 4 38 3.6 _c 34 v 3.2 6 3 c 28 Et 26 24 22 2 18 16 14 12 1 08 06 04 02 41 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (firs) Runoff Hydrograph 48 4.6 44 42 4 3.8 36 34 32 3 2.8 ti 2.6 w 24 0 C 22 a 2 1.8 1 .6 1 .4 12 1 0.8 06 0.4 0.2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 9 of 9 Golfer Substation - Proposed Conditions - 10 Year 1 Hour Project Description File Name .. Colfer Proposed With Plpes.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Jun 01. 2015 00:00:00 End Analysis On Jun 04, 2015 00:00:00 Start Reporting On Jun 01, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 5 Nodes 12 Junctions g Duffells 3 Flow Diversions 0 Inlets . 0 Storage Nodes 1 Links 10 Channels ... 1 Pipes 7 Pumps 0 Orifices 2 Weirs 0 Outlets 0 Pollutants 0 Land Uses Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) 1 Rain Gage-01 Time Series 10 YR - 1 HR Cumulative inches Colorado Weld 10 1.39I �) Florida DOT 1-hr Page 1 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (In) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Central 10.89 2.00 68.20 2.5000 948.00 0.0150 0.1500 1.39 1.2380 0.11 1.15 1 .20 0 00:32:50 2 NorthWest 2.21 2.00 68.00 3.5000 548.00 0.0150 0.1500 1.39 1.2000 0.14 0.31 0.54 0 00:15:49 3 SouthEast 4.07 2.00 68.00 4.0000 443.00 0.0150 0.1500 1.39 1.2240 0.12 0.48 0.61 0 00:24:56 4 SubYardNorth 2.59 0.00 76.00 1.0000 644,00 0.0150 0.0240 1.39 0.9900 0.35 0.91 2.28 0 00:07:45 5 SubYardSouth 1.89 0.00 76.00 1.0000 658.00 0.0150 0.0240 1.39 0.9850 0.36 0.67 1 .82 0 00:06:20 Page 2 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Node Summary SN Element Element Invert GroundlRim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) (ft') (c(s) (ft) (ft) (ft) (days hh:mm) (ac-in) (min) 1 Narthin Junction 4898.85 0.86 4898.85 0.86 0.00 2.28 4899.23 0.00 1.12 0 00:00 0.00 0.00 2 NorthtoPond Junction 4897.46 4903.46 4897.46 4903.46 0.00 2.26 4897.83 0.00 5.62 0 00:00 0.00 0.00 3 PondOut Junction 4896.50 4900.00 4896.50 0.00 0.00 0.08 4896.61 0.00 3.39 0 00:00 0.00 0.00 4 PondPipeOut Junction 4896.24 4900.00 0.00 0.00 0.00 0.08 4896.35 0.00 3.65 0 00:00 0.00 0.00 5 Southln Junction 4899.01 0.86 4899.01 0.86 0.00 1.82 4899.43 0.00 1.09 0 00:00 0.00 0.00 6 SouthtoPond Junction 4898.13 4904.13 4898.13 4904.13 0.00 1.81 4898.54 0.00 5.59 0 00:00 0.00 0.00 ' 7 Structure - (77) Junction 4894.39 1.56 4894.39 1.56 0.00 1.20 4894.75 0.00 1.64 0 00:00 0.00 0.00 8 Structure - (78) Junction 4894.19 1.56 4894.19 1.56 0.00 1.20 4894.55 0.00 1.64 0 00:00 0.00 0.00 9 CentralOut Outfall 4893.70 1.20 4893.70 10 NorthWestOut Outfall 4900.00 0.54 4900.00 11 SouthEastOut Outfall 4894.00 0.61 4894.00 12 Pond Storage Node 4897.00 4900.00 0.00 0.00 4.07 4897.52 0.00 0.00 r Page 3 of 24 Caller Substation-Proposed Conditions- 10 Year 1 Hour Link Summary SN Element Element From To (Outlet) Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/ Peak Flow Peak Flow Peak Flow Total Time Reported ID Type (Inlet) Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Surcharged Condition Node Elevation Elevation Ratio Total Depth Ratio (ft) 0) .ft' (%j (rn) cfs) (cfs) (fttsec) (0) min 1 Link-01 Pipe Structure-(78) CentralOut 130.98 4894.19 4893.70 0.3700 0.000 0.0150 1.20 0.00 0.00 0.00 0.00 0.00 0.00 2 Link-02 Pipe NodhtoPond Pond 56.21 4897.46 4897.00 0.8100 0.000 0.0150 2.26 0.00 0.00 0.00 0.00 0.00 0.00 3 Link-03 Pipe SouthtoPond Pond 78.14 4898.13 4897.00 1.4.400 0.000 0.0150 1.81 0.00 0.00 0.00 0.00 0.00 0.00 4 NorthDischarge Pipe Northln NorthtoPond 68.00 4898.85 4897,46 2.0500 18.000 0.0120 2.26 16.30 0.14 6,49 0.37 0.25 0.00 Calculated 5 Pipe-(81) Pipe Structure-(77) Structure-(78) 40.00 4894.39 4894.19 0.5000 24.000 0.0120 1.20 17.33 0.07 3.17 0.35 0.18 0.00 Calculated 6 PondOut Pipe PondOut PondPipeOut 32.00 4896.50 4896.24 0.8000 18.000 0.0150 0.08 8.14 0.01 1.48 0.11 0.07 0.00 Calculated 7 SouthDischarge Pipe Southln SouthtoPond 95.00 4899.01 4898.13 0.9300 18.000 0.0120 1.81 10.99 0.16 4.61 0.39 0.27 0.00 Calculated 8 swale Channel PondPipeOut Structure- (77) 300.00 4896.24 4894.39 0.6200 6.000 0.0320 0.08 45.24 0.00 0.18 0.01 0.02 0.00 9 BleedDown Orifice Pond PondOut 4897.00 4896.50 4.000 0.08 10 Grate Orifice Pond PondOul 4897.00 4896.50 24.000 0.00 Page 4 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin Hydrology Subbasin : Central Input Data Area (ac) 10.89 Impervious Area (%) 2.00 Weighted Curve Number 68.20 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 948.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness . 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 10.89 - 68.20 Composite Area & Weighted CN 10.89 68.20 Subbasin Runoff Results Total Rainfall (In) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (In) 1,2380 Total Runoff (in) 0.11 Peak Runoff (cfs) 1.20 Weighted Curve Number 68,20 Time of Concentration (days hh:mm:ss) 0 00:32:50 Page 5 of 24 Colter Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : Central Rainfall Intensity Graph 3 2.9 j 2.6 27 26 25 24 23 22 21 2 19 18 r 17 16 mV 1 5 c 14 ' 13 12 11 1 09 0.8 07 06 05 0.4 03 02 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 1 25 12 1.15 1 ,1 1 05 1 0 95 0.9 0.85 08 0 75 (.7 007 t065 S 06 055 05 045 04 035 03 0 25 02 015 01 0 05 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 6 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : NorthWest Input Data Area (ac) 2.21 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (In/hr) 0.1500 Drying The (days) 7.00 Average Slope (%) 3.5000 Equivalent Width (ft) 548.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness ..... .......... . ... 0.1500 Curb & Gutter Length (ft) ... 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 2.21 - 68.00 Composite Area & Weighted CN 2.21 68.00 Subbasin Runoff Results Total Rainfall (in) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2000 Total Runoff (in) 0.14 Peak Runoff(cfs) 0.54 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:15:49 Page 7 of 24 Golfer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : NorthWest Rainfall Intensity Graph 31 3 293 28 27 26 25 24 23 22 21 2 19 1.8 L 17 1 .6 m 15 w c 1 4 res 1 .3 12 11 1 09 08 07 06 05 04 03 02 01 . 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 0 54 0 52 05 0.48 0 46 0 44 0.42 04 038 0.36 034 0.32 ta 0.3 " 028 mg 026 0 24 0 22 0.2 018 016 I 0 14 0 12 01 0 08 0 06 0 04 002 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 8 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SouthEast Input Data Area (ac) 4.07 impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (In/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 4.0000 Equivalent Width (ft) 443.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0 1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area SoII Curve Soil/Surface Description (acres) Group Number 4.07 - 68.00 Composite Area &Weighted CN 4.07 68.00 Subbasin Runoff Results Total Rainfall (in) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2240 Total Runoff (in) 0.12 Peak Runoff (cfs) 0.61 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:24:56 Page 9 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SouthEast Rainfall Intensity Graph 31 3 29 28 27 26 25 24 23 22 21 2 19 18 17c V 16 m 15 w 1 .4 tx 1 3 t.2 1 . 1 1 O 9 0.8 07 06 05 04 03 02 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph O 62 0.6 058 056 0.54 052 O 5 O 48 0 46 0 44 0 42 04 0 38 0 36 0.34 0.32 0 0.3 0.28 0.26 0 24 0 22 02 O 16 O 16 014 0 12 01 008 006 004 0 02 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 10of24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubYardNorth Input Data Area (ac) 2.59 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 1.0000 Equivalent Width (ft) 644.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number .. Area Soil Curve Soil/Surface Description (acres) Group Number 2.59 - 76.00 Composite Area & Weighted CN 2.59 76.00 Subbasin Runoff Results Total Rainfall (in) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 0.9900 Total Runoff (in) 0.35 Peak Runoff (cfs) 2.28 Weighted Curve Number . 76.00 Time of Concentration (days hh:mm:ss) 0 00:07:45 Page 11 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubYardNorth Rainfall Intensity Graph 31 3 f 29 2.8 27 26 25 24 23 22 21 2 19 18 L 17 1 .6 m 1 .5 1 .4 1.3 1 .2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 23 22 21 J 2 19 1.8 17 16 15 14 N t3 1 `r 2 t C O 11 z ix 1 09 08 07 06 05 0.4 03 0.2 01 J l 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 12 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubYardSouth Input Data Area (ac) 1.89 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 1.0000 Equivalent Width (ft) 658.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Sod/Surface Description (acres) Group Number • 1.89 - 76.00 Composite Area & Weighted CN 1.89 76.00 Subbasln Runoff Results Total Rainfall (in) 1.39 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 0.9850 Total Runoff (in) 0.36 Peak Runoff (cfs) 1.82 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:06:20 Page 13 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubYardSouth Rainfall Intensity Graph 31 3 29 26 27 26 25 24 2.3 22 21 2 19 ich r 18 1 7 1 .6 1 15 4- 1 .4 co t: 1 .3 12 1. 1 1 09 0.8 07 06 0.5 0.4 03 0.2 01 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 18 17 16 15 14 13 12 11 '- 1 w U 0 09 a 0.8 07 0.6 05 0.4 kaL 0.3 02 01 • 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 14of24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max) (Max) Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft') (in) 1 NorthIn 4898.85 0.86 -4897.99 4898.85 0.00 0.86 0.00 0.00 0.00 2 NorthtoPond 4897.46 4903.46 6.00 4897.46 0.00 4903.46 0.00 0.00 0.00 3 PondOut 4896.50 4900.00 3.50 4896.50 0.00 0.00 -4900.00 0.00 0.00 4 PondPipeOut 4896.24 4900.00 3.76 0.00 -4896.24 0.00 -4900.00 0.00 0.00 5 Southln 4899.01 0.86 -4898.15 4899.01 0.00 0.86 0.00 0.00 0.00 6 SouthtoPand 4898.13 4904.13 6.00 4898,13 0.00 4904.13 0.00 0.00 0.00 7 Structure- (77) 4894.39 1.56 -4892.83 4894.39 0.00 1.56 0.00 0.00 0.00 8 Structure - (78) 4894.19 1.56 -4892.63 4894.19 0.00 1.56 0.00 0.00 0.00 Page 15 of 24 Colter Substation - Proposed Conditions - 10 Year 1 Hour Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs) (cfs) (ft) (ft) (ft) (ft) (ft) (ft) (days hh:mm) (days hh:mm) (ac-in) (min) 1 Northln 2.28 2.28 4899.23 0.38 0.00 1.12 4898.85 0.00 0 00:42 0 00:00 0.00 0.00 2 NorthtoPand 2.26 0.00 4897.83 0.38 0.00 5.62 4897.46 0.01 0 00:42 0 00:00 0.00 0.00 3 PondOut 0.08 0.00 4896.61 0.11 0.00 3.39 4896.55 0.05 0 0127 0 00'00 0.00 0.00 4 PondPipeOut 0.08 0.00 4896.35 0.11 0.00 3.65 4896.29 0.05 0 01'28 0 00'00 0.00 0.00 5 Southln 1.82 1.82 4899.43 0.42 0.00 1.09 4899.02 0.01 0 0042 0 00:00 0.00 0.00 6 SouthtoPond 1.81 0.00 4898.54 0.41 0.00 5.59 4898.13 0.00 0 00'42 0 00'00 0.00 0.00 7 Structure - (77) 1.20 1.20 4894.75 0.36 0.00 1.64 4894.44 0.05 0 00 54 0 00.00 0.00 0.00 8 Structure - (78) 1.20 0.00 4894.55 0.36 0.00 1.64 4894.24 0.05 0 00:54 0 00:00 0.00 0.00 Page 16 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape Height Width Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert Invert Drop Slope Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset (ft) (ft) (ft) (h) (It) (ft) (%) (ft) (h) (cfs) 1 swale 300.00 4896.24 0.00 4894.39 0.00 1.85 0.6200 Rectangular 0.500 40.000 0.0320 0.5000 0.5000 0.0000 0.00 No Page 17 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 swale 0.08 0 01 :58 45.24 0.00 0.18 27.78 0.01 0.02 0.00 Page 18 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Plpe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset Height (ft) (ft) (ft) (1t) (ft) (tt) (%) (in) (in) (cfs) 1 Link-01 130.98 4894.19 0.00 4893.70 0.00 0.49 0.3700 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 2 Link-02 56.21 4897.46 0.00 4897.00 0.00 0.45 0.8100 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 3 Link-03 78.14 4898.13 0.00 4897.00 0.00 1.13 1.4400 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 4 NorthDischarge 68.00 4898.85 0.00 4897.46 0.00 1.40 2.0500 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00 No 5 Pipe - (81) 40.00 4894.39 0.00 4894.19 0.00 0.20 0.5000 CIRCULAR 24.000 24,000 0.0120 0.5000 0.5000 0.0000 0.00 No 6 PondOut 32.00 4896.50 0.00 4896.24 0.00 0.26 0.8000 CIRCULAR 18.000 18.000 0.0150 0.5000 0.5000 0.0000 0.00 No 7 SouthDischarge 95.00 4899.01 0.00 4898.13 0.00 0.89 0.9300 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00 No ' IT Page 19 of 24 Colfer Substation - Proposed Conditions - 10 Year 1 Hour No. of Barrels 1 1 1 1 1 1 1 Page 20 of 24 Colter Substation - Proposed Conditions - 10 Year 1 Hour Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (mm) (ft) (mm) I Link-01 1.20 0 00:54 0.00 0.00 0.00 0.00 0.00 0.00 2 Link-02 2.26 0 00:42 0.00 0.00 0.00 0.00 0.00 0.00 3 Link-03 1.81 0 00:42 0.00 0.00 0.00 0.00 0,00 0.00 4 NorthDischarge 2.26 0 00:42 16.30 0.14 6.49 0.17 0.37 0.25 0.00 Calculated 5 Pipe -(81) 1.20 0 00:54 17.33 0.07 3.17 0.21 0.35 0.18 0.00 Calculated 6 PondOul 0.08 0 01:28 8.14 0.01 1.48 0.36 0.11 0.07 0.00 Calculated ' 7 SouthDischarge 1.81 0 00:42 10.99 0.16 4.61 0.34 0.39 0.27 0.00 Calculated S Page 21 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Storage Nodes Storage Node : Pond Input Data Invert Elevation (ft) 4897.00 Max (Rim) Elevation (ft) 4900.00 Max (Rim) Offset (ft) 3.00 Initial Water Elevation (ft) 0.00 Initial Water Depth (ft) -4897.00 Ponded Area (ft') 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : Pond Stage Storage Storage Area Volume (ft) on (ft') 0 7281 0.000 1 20440 13860.50 2 22862 35511.50 3 25384 59634.50 Page 22 of 24 Colter Substation - Proposed Conditions - 10 Year 1 Hour Storage Area Volume Curves Storage Volume (ft3) 0 5,000 10,000 15,000 20,000 25,000 30.000 35,000 40,000 45,000 60,000 55,000 61,000 3 p i. •. . . 3 • • e 2.9 • ' r . • r • r - �- 2.9 . • • • 2.8 ' - 2.8 I • . 2.T I ' J• •- 2.7 • 1 . • 1 • 2.6 4 'r 4- • - 4 1 2.6 • • • • • • • •I 2.5 . _ i r 1 r- ; , r ; i 2.5 • • • . , 1 I • • I I • 1 • • I • •I • • 2.4 - -N .. .. • ♦- • . • • • • • 2.4 • • • • I • • • I • • • • • • • • • 1 , 2.3 . . _ _ . . _ . . .2.3 • • . • •. • • • • • • • • • •2.2 I.• •• •• a• •• 1• 2.2 p • • • . I I I I • • 2.1 • r I I r r 2.1 • I • • 1 • 2 I ; 2 . - •• • . I • • 1 I : I I I I • 4 1 • I ' • • • . 1 1.9 - • L a L J . _-• • L -1.9 • • • • . 1 ' • • 1.8 I 1 -- __ . .• I- ►. . . . . -. " • - . - . -- .a . . . - • •_ •• 1.8 ' ' 1 • • 1 • • , I • • • • ' • • • • 1 . : • • I . • • • 1 • 1 • 1 . • • 1 I.... • 1 • • 1 1 •Ime v) 1.4 • . . L 1 • i • 1.4 tl> • 1 . 1 . . • 1 • I . II • 1 1.2 • i r • - - - 'i r • r � r 1.? • • 1 1 • 1 1 • 1 . • • • 1 1 • • /I 1 1 • • 1 • 1 1 1 •• ' '• ' 1 _ 1 0.9 ' ' ' •• 0.9 • • • • • • 0.8 j. - • - 0.8 • • • • • I 0.7 • • I - 0.7 • • • • . • • • • 0.6 ---� -' 0.6 • • • I • I • • 0.5 • , - _. ; - I . . . - - . _ - - . •-- • 0.4 - 4 . . • - • • - -i - - - 0.4 • • • • • • 0.2 : .-- . . . . 0.2 . • • .. 4 { -0.1 - -• • 0.1- 0 . . - • S ‘ 0 8,000 10, 00 12,000 14,000 16,000 18,000 20,000 22,000 24,000 Storage Area (frz) — Storage Area — Storage Volume , Page 23 of 24 Coffer Substation - Proposed Conditions - 10 Year 1 Hour Storage Node : Pond (continued) Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in) (in) (in) (ft) 1 BleedDown Side Rectangular No 4.00 1.00 4897.00 0.63 2 Grate Bottom Rectangular No 24.00 24.00 4898.00 0.63 Output Summary Results Peak Inflow (cfs) 4.07 Peak Lateral Inflow (cfs) 0.00 Peak Outflow (cfs) 0.08 Peak Exfiltration Flow Rate (cfm) 0.00 Max HGL Elevation Attained (ft) 4897.52 Max HGL Depth Attained (ft) 0.52 Average HGL Elevation Attained (ft) 4897.16 Average HGL Depth Attained (ft) 0.16 Time of Max HGL Occurrence (days hh:mm) 0 01:27 Total Exfiltration Volume (1000-ft') 0.000 Total Flooded Volume (ac-in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0,00 Page 24 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Project Description File Name Coffer Proposed With Plpes.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Jun 01, 2015 00:00:00 End Analysis On Jun 04, 2015 00:00:00 r Start Reporting On Jun 01, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 5 Nodes 12 Junctions 8 Oulfalls 3 Flow Diversions 0 Inlets 0 Storage Nodes 1 Links 10 Channels 1 Pipes 7 Pumps 0 Orifices 2 Weirs 0 Outlets . 0 Pollutants 0 Land 'Isms 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (Inches) 1 Rain Gage-01 Time Series 100 YR - 1 HR Cumulative inches Colorado Weld 10 2.65 Florida DOT 1-hr Page 1 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (in) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Central 10.89 2.00 68.20 2.5000 948.00 0.0150 0.1500 2.65 1.9070 0.70 7.57 9.84 0 00:25:22 2 NorthWest 2.21 2.00 68.00 3.5000 548.00 0.0150 0.1500 2.65 1.8340 0.77 1.70 3.41 0 00:12:13 3 SouthEast 4.07 2.00 68.00 4.0000 443.00 0.0150 0.1500 2.65 1.8780 0.73 2,95 4.60 0 00:19:15 4 SubYardNorth 2.59 0.00 76.00 1.0000 644.00 0.0150 0.0240 2.65 1.4700 1.13 2.93 7.46 0 00:05:59 5 SubYardSouth 1.89 0.00 76.00 1.0000 658.00 0.0150 0.0240 2.65 1.4640 1.14 2.15 5.54 0 00:04:53 Page 2 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) tin (cfs) (ft) (ft) (ft) (days hh:mm) (ac-in) (mm) 1 Northln Junction 4898.85 036 4898.85 0.86 0.00 7.46 4899.56 0.00 0.79 0 00:00 0.00 0.00 2 NorthtoPond Junction 4897.46 4903.46 4897.46 4903.46 0.00 7.45 4898.17 0.00 5.29 0 00,00 0.00 0.00 3 PondOut Junction 4896.50 4900.00 4896.50 0.00 0.00 1.58 4896.95 0.00 3.05 0 00:00 0.00 0.00 4 PondPipeOut Junction 4896.24 4900.00 0.00 0.00 0.00 1.58 4896.69 0.00 3.31 0 00.00 0.00 0.00 5 Southln Junction 4899.01 0.86 4899.01 0.86 0.00 5.54 4899.77 0.00 0.75 0 00:00 0.00 0.00 6 SouthtoPond Junction 4898.13 4904.13 4898.13 4904.13 0.00 5.52 4898.88 0.00 5.25 0 00:00 0.00 0.00 ' 7 Structure - (77) Junction 4894.39 1.56 4894.39 1.56 0.00 9.84 4895.47 0.00 0.92 0 00:00 0.00 0.00 8 Structure - (78) Junction 4894.19 1,56 4894.19 1.56 0.00 9.83 4895.27 0.00 0.92 0 00:00 0.00 0.00 9 CentralOut Outfall 4893.70 9.83 4893.70 10 NorthWestOut Outfall 4900.00 3.41 4900.00 11 SouthEastOut Outfall 4894.00 4.60 4894.00 12 Pond Storage Node 4897.00 4900.00 0.00 0.00 12.97 4898.14 0.00 0.00 '" Page 3 of 24 Colter Substation-Proposed Conditions- 100 Year 1 Hour Link Summary SN Element Element From To(Outlet) Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Row/ Peak Flow Peak Flow Peak Flow Total Time Reported ID Type (Inlet) Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Surcharged Condition Node Elevation Elevation Ratio Total Depth Ratio (ft) 'ft 'ft) %' in) cfs cfs ,ft/sec ft) min 1 Link-01 Pipe Structure-(78) CentralOul 130.98 4894.19 4893.70 0.3700 0.000 0.0150 9.83 0.00 0.00 0.00 0.00 0.00 0.00 2 Link-02 Pipe NorthtoPond Pond 56.21 4897.46 4897.00 0.8100 0.000 0.0150 7.45 0.00 0.00 0.00 0.00 0.00 0.00 3 Link-03 Pipe SouthtoPond Pond 78.14 4898.13 4897.00 1.4400 0.000 0.0150 5.52 0.00 0.00 0.00 0.00 0.00 0.00 4 NorthDischarge Pipe Northln NorthtoPond 68.00 4898.85 4897.46 2.0500 18.000 0.0120 7.45 16.30 0.46 9.02 020 0.47 0.00 Calculated 5 Pipe•(81) Pipe Structure-(77) Structure-(78) 40.00 4894.39 4894.19 0.5000 24.000 0.0120 9.83 17.33 0.57 5.69 1.06 0.54 0.00 Calculated 6 PondOut Pipe PondOut PondPipeOut 32.00 4896.50 4896.24 0.8000 18.000 0.0150 1.58 8.14 0.19 3.57 0A5 0.30 0.00 Calculated 7 SouthDischarge Pipe Southln SouthtoPond 95.00 4899.01 4898.13 0.9300 18.000 0.0120 5.52 10.99 0.50 6.24 0.74 0.50 0.00 Calculated 8 swale Channel PondPipeOut Structure•(77) 300.00 4896.24 4894.39 0.6200 6.000 0.0320 1.53 45.24 0.03 0.60 0.06 0.13 0.00 9 BleedDown Orifice Pond PondOul 4891.00 4896.50 4.000 0.14 10 Grate Orifice Pond PondOut 4897.00 4896.50 24.000 1.44 Page 4 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin Hydrology Subbasin : Central Input Data Area (ac) 10.89 Impervious Area e/o) 2.00 Weighted Curve Number 68.20 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 948.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soi/Surface Description (acres) Group Number 10.89 - 68.20 Composite Area & Weighted CN 10.89 68.20 Subbasin Runoff Results Total Rainfall (in) 2.65 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.9070 Total Runoff (in) 0.70 Peak Runoff(cfs) 9,84 Weighted Curve Number 68.20 Time of Concentration (days hh:mm:ss) 0 00:25:22 Page 5 of 24 Collor Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : Central Rainfall Intensity Graph 58 56 54 52 5 48 46 44 42 4 38 36 34 3.2 3 3 2.8 2.6 a 24 22 2 18 16 14 12 1 08 06 04 02 . 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 105 -- 10 95 9 85 8 75 7 65 7 6 55 t 0 5 c 45 4 35 I 3 25 2 15 1 05 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 6 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : NorthWest Input Data Area (ac) 2.21 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 3.5000 Equivalent Width (ft) 548.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness .. ..... 4 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number • 2.21 - 68.00 Composite Area & Weighted CN 2.21 68.00 Subbasin Runoff Results Total Rainfall (in) 2.65 Total Runon (In) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.8340 Total Runoff (in) 0.77 Peak Runoff(cfs) 3.41 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:12:13 Page 7 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : NorthWest Rainfall Intensity Graph 62 6 58 56 54 52 5 48 46 44 4.2 4 38 3.6 L 34 L 3.2 To 3 2.8 ix 2.6 24 2.2 2 18 1 .6 14 I 1 .2 1 0.8 06 0.4 0.2 � 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff 1-h/drograph 36 - 34 32 3 28 26 24 22 El 2 9- U w 1 .8 0 C tY 1.6 14 12 1 08 06 04 02 k 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 8 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : South East Input Data Area (ac) 4.07 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (In/fir) 0.1500 Drying Time (days) 7.00 Average Slope (%) 4.0000 Equivalent Width (ft) 443.00 Impervious Area Manning's Roughness . 0.0150 Pervious Area Manning's Roughness . ... ... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number .� Area Soil Curve Soil/Surface Description (acres) Group Number 4.07 - 68.00 Composite Area & Weighted CN 4.07 68.00 Subbasin Runoff Results Total Rainfall (in) 2.65 Total Runon (In) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.8780 Total Runoff (in) 0.73 Peak Runoff (cfs) 4.60 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:19:15 Page 9 of 24 Coffer Substation - Proposed Conditions- 100 Year 1 Hour Subbasin : SouthEast Rainfall Intensity Graph 62 6 58 56 J 54 5.2 5 48 46 44 42 4 38 3.6 L 34 3.2 �0 3 2.8 la 2.6 24 2.2 2 18 16 14 12 1 08 06 0.4 02C 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 48 46 4.4 4.2 4 38 3.6 3.4 32 3 ,7 2.8 23 2.6 0 24 22 11 2 18 16 14 12 1 08 06 04 0.2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 10 of 24 Colfer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubYardNorth Input Data Area (ac) 2.59 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 1.0000 Equivalent Width (ft) 644.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number .� Area Soil Curve Sod/Surtace Description (acres) Group Number 2.59 - 76.00 Composite Area & Weighted CN 2.59 76.00 Subbasln Runoff Results Total Rainfall (In) 2.65 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.4700 Total Runoff (In) 1.13 Peak Runoff (cfs) 7.46 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:05:59 Page 11 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubYardNorth Rainfall Intensity Graph 62 6 58 56 I 54 52 5 48 46 44 42 4 38 36 C 3d 32 76 3 2.8 els Et 2.6 2.4 22 2 18 16 14 12 1 08 06 0.4 02 . I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 8 ' 75 7 65 6 55 5 45 4 Et 0! 35 3 25 2 15 1 05 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 12 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubYardSouth Input Data Area (ac) 1.89 Impervious Area r/n) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 1.0000 Equivalent Width (ft) 658.00 Impervious Area Manning's Roughness 0.0150 ' Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Descnption (acres) Group Number 1.89 - 76.00 Composite Area & Weighted CN 1.89 76.00 Subbasin Runoff Results Total Rainfall (in) . 2.65 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.4640 Total Runoff (in) 1.14 Peak Runoff(cfs) 5.54 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:04:53 Page 13 of 24 Cotter Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubYardSouth Rainfall Intensity Graph 62 6 58 56 54 52 5 48 46 44 42 4 38 t 36 34 C 3 2 io 3 c 28 tY 2 6 24 22 2 18 16 14 12 1 08 06 04 02 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 56 54 52 5 48 46 44 42 4 38 36 34 7, 32 ( 3 0 28 c 26 ar 2 4 22 2 18 16 14 12 1 08 06 04 02 t r l 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Page 14 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max) (Max) Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft') (in) 1 Northln 4898.85 0.86 -4897.99 4898.85 0.00 0.86 0.00 0.00 0.00 2 NorthtoPond 4897.46 4903,46 6.00 4897.46 0.00 4903.46 0.00 0.00 0.00 3 PondOut 4896.50 4900.00 3.50 4896.50 0.00 0.00 4900.00 0.00 0.00 4 PondPlpeOut 4896.24 4900.00 3.76 0.00 -4896.24 0.00 -4900.00 0.00 0.00 5 Southln 4899.01 0.86 -4898.15 4899.01 0.00 0.86 0.00 0.00 0.00 6 SouthtoPond 4898.13 4904.13 6.00 4898.13 0.00 4904.13 0.00 0.00 0.00 7 Structure - (77) 4894.39 1.56 -4892.83 4894.39 0.00 1.56 0,00 0.00 0.00 ' 8 Structure - (78) 4894.19 1.56 -4892.63 4894.19 0.00 1.56 0.00 0.00 0.00 w Page 15 of 24 Colfer Substation - Proposed Conditions - 100 Year 1 Hour Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs) (cfs) (ft) (ft) (ft) (ft) (ft) (ft) (days hh:mm) (days hh:mm) (ac-in) (min) 1 Northtn 7.46 7.46 4899.56 0.71 0.00 0.79 4898.86 0.01 0 00:42 0 00:00 0.00 0.00 2 NorthtoPond 7.45 0.00 4898.17 0.72 0.00 5.29 4897.46 0.01 0 00:42 0 00:00 0.00 0.00 3 PondOut 1.58 0.00 4896.95 0.45 0.00 3.05 4896.58 0.08 0 01:05 0 00:00 0.00 0.00 4 PondPipeOut 1.58 0.00 4896.69 0.45 0.00 3.31 4896.33 0.09 0 01:05 0 00:00 0.00 0.00 5 Southln 5.54 5.54 4899.77 0.76 0.00 0.75 4899.02 0.01 0 00:42 0 00:00 0.00 0.00 6 SouthtoPond 5.52 0.00 4898.88 0.75 0.00 5.25 4898.13 0.00 0 00:42 0 00:00 0.00 0.00 7 Structure - (77) 9.84 9.84 4895.47 1.08 0.00 0.92 4894.48 0.09 0 00:54 0 00:00 0.00 0.00 8 Structure - (78) 9.83 0.00 4895.27 1.08 0.00 0.92 4894,28 0.09 0 00:54 0 00:00 0.00 0.00 Page 16 of 24 Colter Substation - Proposed Conditions - 100 Year 1 Hour Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape Height Width Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert Invert Drop Slope Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset (ft) (ft) (ft) (ft) (ft) (ft) (°h)) (ft) (ft) (cis) 1 swale 300.00 4896.24 0.00 4894.39 0.00 1.85 0.6200 Rectangular 0.500 40.000 0.0320 0.5000 0.5000 0.0000 0.00 No I Page 17 of 24 Colfer Substation - Proposed Conditions - 100 Year 1 Hour Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 swale 1.53 0 01:12 45.24 0.03 0.60 8.33 0.06 0.13 0.00 Page 18 of 24 Colfer Substation - Proposed Conditions - 100 Year 1 Hour Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset Height (ft) (ft) (ft) (ft) (R) (h) (`46) (in) (in) (cfs) 1 Link-01 130.98 4894.19 0.00 4893.70 0.00 0.49 0.3700 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 2 Link-02 56.21 4897.46 0.00 4897.00 0.00 0.45 0.8100 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 3 Link-03 7814 4898.13 0.00 4897.00 0.00 1.13 1.4400 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 4 NorthDischarge 68.00 4898.85 0.00 4897.46 0.00 1.40 2.0500 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00 No 5 Pipe - (81) 40.00 4894.39 0.00 4894.19 0.00 0.20 0.5000 CIRCULAR 24.000 24.000 0.0120 0.5000 0.5000 0.0000 0.00 No 6 PondOut 32.00 4896.50 0.00 4896.24 0.00 0.26 0.8000 CIRCULAR 18.000 18.000 0.0150 0.5000 0.5000 0.0000 0.00 No 7 SouthOischarge 95.00 4899.01 0.00 4898.13 0.00 0.89 0.9300 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00 No ' Page 19 of 24 Colter Substation - Proposed Conditions - 100 Year 1 Hour Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cls) (fUsec) (min) (ft) (min) 1 Link-01 9.83 0 00:54 0.00 0.00 0.00 0.00 0.00 0.00 2 Link-02 7.45 0 00:42 0.00 0.00 0.00 0.00 0.00 0.00 3 Link-03 5.52 0 00:42 0.00 0.00 0.00 0.00 0.00 0.00 4 NorthDischarge 7.45 0 00:42 16.30 0.46 9.02 0.13 0.70 0.47 0.00 Calculated 5 Pipe - (81) 9.83 0 00:54 17.33 0.57 5.69 0.12 1.06 0.54 0.00 Calculated 6 PondOut 1.58 0 01 :05 8.14 0.19 3.57 0.15 0.45 0.30 0.00 Calculated 7 SouthDischarge 5.52 0 00:42 10.99 0.50 6.24 0.25 0.74 0.50 0.00 Calculated Page 21 of 24 Colter Substation - Proposed Conditions - 100 Year 1 Hour Storage Nodes Storage Node : Pond Input Data Invert Elevation (ft) 4897.00 Max (Rim) Elevation (It) 4900.00 Max (Rim) Offset (ft) 3.00 Initial Water Elevation (ft) 0.00 Initial Water Depth (ft) -4897.00 Ponded Area (ft') 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : Pond Stage Storage Storage Area Volume (ft) (ft=) (f[3) 0 7281 0.000 1 20440 13860.50 2 22862 35511 .50 3 25384 59634.50 Page 22 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Storage Area Volume Curves Storage Volume (ft°') 0 5,000 10,000 15,000 20,000 25,000 30.000 33,000 40,000 45,060 50,000 55,000 60,000 3 i • 3 2.9 { . . . ••• • • 2.9 • , • • 2.8 - •-- • 2.8 h _. . - • . . y•2.7 • 1 2.7 •i 2.6 i 1 2.6 • • • • • • 2.5 ; •• ; 2.5 • • • • • • • . 2.4 - •-.. • • • 2.4• . • • • 2.3 • a •- - -- 2.3 • • • • . ; 2.2 t - •- i. , a . _ _• • - 2.2 • . • • • • •r • -• - 2.1 • • • • • . • • 2 r - • • • • • . 1.9 • . . - • • • • : • • t::: . : : : : : : . . . . . . • • • • 1.7 • 1.7 • • • • • • = 1.6 : r :- i . . . 1.6 S- • • • • : •• '• • CD X 1.3 J I 1.5 Ch IS I Sr cm 1. • •4 • • -- • • 1.4 vt • • • • • • • • • • • • . • 1.2 -r - ► % - - - - - 1 • - • 1.2 ' • • • • • • • • • • • • • • • • • 1 . . • • J . • __- 1 • II • • • • • • • • . • • • 0.8 ; . . . . r . r % i i 0.8 • - 0.7 - ` • • • • r • • 0.7 0.6 - • _ . - . • • 0.6 0.5 : --- -; J • L _ 4. 0.5 • • • • : 0.3 - . . • r - . . . . . 0.3 • • • • •0.2 r • • 0 =.. . . . 0.2 • • • • • • ;I.- 0.1 0 } _ 0 8,000 10,000 12,600 14,000 16,000 18,000 20,000 22,000 24,000 Storage Area (f12) — Storage Area — Storage Volume Page 23 of 24 Coffer Substation - Proposed Conditions - 100 Year 1 Hour Storage Node : Pond (continued) Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in) (In) (in) (ft) 1 BleedDown Side Rectangular No 4.00 1.00 4897.00 0.63 2 Grate Bottom Rectangular No 24.00 24.00 4898.00 0.63 Output Summary Results Peak Inflow (cfs) 12.97 Peak Lateral Inflow (cfs) 0.00 Peak Outflow (cfs) 1.58 Peak Exfiltration Flow Rate (cfm) 0.00 Max HGL Elevation Attained (ft) 4898.14 Max HGL Depth Attained (ft) 1.14 Average HGL Elevation Attained (ft) 4897.40 Average HGL Depth Attained (ft) 0.4 Time of Max HGL Occurrence (days hh:mm) 0 01:05 Total Exfiltration Volume (1000-ft') 0.000 Total Flooded Volume (ac-in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0.00 Page 24 of 24 TRI -STATE GENERATION & TRANSMISSION , INC . MILTON SUBSTATION DRAINAGE REPORT ..14:4)0././c6 July 2015 •• • v . • r / :O 47195 0� • • t 7V7�' .3., •os • 1,1 11‘ 3JONAL ... a" Prepared by: nikI DEL - A�� ONT CONSULTANTS , INC . Ain, ENGINEERING • Y1 125 Colorado Ave. r Wontro3e, CO 81401 • (370) 249-2251 ♦ (970) 249-2342 FAX Er 7=7 - wv.w.dc l mon:.coin • servicedtd&-mont.com Dm Milton Substation Drainage Report I TRI-STATE GENERATION & TRANSMISSION , INC . MILTON SUBSTATION DRAINAGE REPORT eassocusDO ord....•'PYNE S•<Ws • 4719"5 E: ict. 7/M S ' • I AS/CNALea e I hereby certify that this report for the drainage design of the Milton Substation was prepared by me (or under my direct supervision) in accordance with the provisions of the Weld County storm drainage criteria for the owners thereof. d0a David Schieldt, P.E. DM€ Milton Substation Drainage Report CERTIFICATION OF COMPLIANCE ENGINEERING DESIGNED TO WELD COUNTY CODE STANDARDS AND CRITERIA 1 F') ctvk,t Consultant Engineer for Nr'r 51#14-- 6evon-koi Th+elS w 13≤ ?obi ("Applicant"), understand and acknowledge that Applicant is seeking land use approval of Sv6S }+04 ("Application") for the property described in the attached Exhibit "A." I have designed or reviewed the design ("Design") for the proposed land use set forth in the Application. I hereby certify, on behalf of Applicant that the Design will meet all applicable drainage requirements of the Weld County Code with the exception of variance(s) described below. This certification is not a guarantee or warranty either expressed or implied. ecikic0L/C4 (Engineer's Stamp) a,O PyNE•••• ji %I • • :O 471 59; S ft Vill X115 / Qi$030,32 • 400 e. SAL Engineer of Record Signature VARIANCE REQUEST 1 ) Describe the Weld County Code criteria of which a variance is being requested. 2) Describe why it is not possible to meet the Weld County Code. 3) Describe the proposed alternative with engineering rational which supports the intent of the Weld County Code. I understand and agree that the intention of the Code is to reduce impacts of development on neighboring downstream properties and the public. I understand if this variance request is approved it is not precedent setting and is based on site specific constraints. Planning Director Approval indicated when signed by director or appointee: Planning Director Name Signature pate of approval 1/13/15 TABLE OF CONTENTS 1 .0 General Location and Description 1 -1 1 .1 Site Location 1 -1 1 .2 Site Description 1 -1 2.0 Drainage Basins and Sub-Basins 2-1 2.1 Existing Drainage Sub-Basins 2-1 2.2 Proposed Drainage Sub-Basins 2-1 3.0 Drainage Design Criteria 3-1 3.1 Methodology 3-1 3.2 Land Cover Hydrologic Properties 3-1 3.3 Weighted Design Values 3-1 4.0 Drainage Facility Design 4-1 4.1 Historical Drainage 4-1 4.2 Proposed Drainage 4-1 5.0 Conclusions 5-1 5.1 Drainage Concept 5-1 5.2 Compliance with the Weld County Code 5-1 6.0 References 6-1 Appendix A — Site Maps & Design Drawings Appendix B — NRCS Soils Report Appendix C — Site Specific Physical Design Properties Appendix D — SWMM Modeling Results Doc. Milton Substation Drainage Report 1 .0 General Location and Description Tri-State Generation and Transmission (TSGT) in coordination with Del-Mont Consultants, Inc. (DMC) is in the process of designing a new substation yard . The scope of work includes the construction of the substation yard, driveway, installation of new perimeter and property fence, and the addition of high voltage electrical equipment and facilities. The purpose of this report is to prevent the findings from the hydrologic analysis that was performed on the existing property as well as the proposed substation yard. 1 .1 Site Location The proposed substation yard is located on a 28.3 acre parcel owned by TSGT situated in Section 13, Township 4 North , Range 65 West, 6th Principal Meridian in Weld County, Colorado. The substation site is accessed from County Road 49 approximately 0.5 miles north of County Road 44. 1 .2 Site Description The site naturally drains from east to west and is covered by native vegetation and weeds. The southern portion of the property drains to an existing on-site retention pond. Site layout details will be discussed in more detail in Section 2. The site receives run on from the south from the neighboring property. The Gilmore Ditch is located approximately 0.5 miles to the north-west and is the only nearby water feature. Given the distance to the nearest water feature, the site is not located within a floodplain. There are no developments on or near the site. € Milton Substation Drainage Report 1 -1 2.0 Drainage Basins and Sub-Basins The property functions overall as two drainage basins flowing either to the existing on-site retention pond or leaving the property flowing to the North West. Water leaving the site will flow overland through various paths/swales and eventually enter the Gilmore Ditch. Both existing and proposed conditions produce several smaller sub-basins. These sub-basins will be discussed in detail in the following sections. 2.1 Existing Drainage Sub-Basins The existing site is divided into three different sub-basins; Northern Area, Southern Area, and Off-Site. A map illustrating the delineation of the sub-basins can be found in Appendix A. The Northern area discharges to the property to the North West and receives run-on from County Road 49. The Southern Area contains the remainder of the property and receives run-on from County Road 49 as well as from the Off-Site sub-basin to the south . The Southern Area discharges to the existing on-site retention pond. For larger storm events, the retention pond will discharge (via overtopping) to the North West where it enters the neighboring property, ultimately entering Gilmore Ditch. There is currently no development present on the neighboring property. Table 2-1 presents the sub-basins and their corresponding acreages. Table 2-1 : Existing Sub-Basin Acreages Sub-Basin Total Area (Acres) Northern Area 8.37 Southern Area 19.94 Off-Site 17.07 2.2 Proposed Drainage Sub-Basins The proposed site is divided into five different sub-basins; Northern Area, Substation Yard North, Substation Yard South, Southern Area, and Off-Site. A map illustrating the delineation of the sub-basins can be found in Appendix A. The Northern area now contains the access driveway and flow in this sub-basin continues to match historical discharge patterns. The Substation Yard drains to an interior trench drain system that discharges to rip-rap channels, ultimately discharging to the detention pond. The Southern Area contains the remainder of the access driveway in addition to the land that surrounds the substation yard containing the drainage swales and the detention pond . The Off-site sub-basin to the south is the same as existing conditions. Table 2-2 presents the proposed sub-basins and their corresponding acreages. Milton Substation Drainage Report 2-1 Table 2-2: Proposed Sub-Basin Acreages Total Area Sub-Basin (Acres) Northern Area 8. 11 Southern Area 12.98 Substation Yard North 3.37 Substation Yard South 3.84 Off-Site 17.07 Milton Substation Drainage Report 2-2 3.0 Drainage Design Criteria 3.1 Methodology The hydrologic/hydraulic analysis of the site was performed using the Autodesk Storm and Sanitary analysis utilizing the SWMM engine platform model for a 10 year, 1 hour rainfall event and a 100 year, 1 hour rainfall event per Weld County Standards. The Curve Number method of determining rainfall losses due to infiltration was used. Runoff for all site conditions was computed for both the 10 year and 100 year, 1 hour storms. Rainfall depths were obtained for the region from NOAA Atlas 14, Volume 8, Version 2 and rainfall distribution curves were developed using a 1 -hour rainfall distribution . Modeling results are presented in Appendix D. The Urban Drainage Storm water Best Management Practice Design Workbook was utilized in conjunction with the Weld County Water Quality Feature Calculation Spreadsheet to determine the required water quality capture volume (WQCV) and to design the outlet structure. The spreadsheets/worksheets can be found in Appendix C and are discussed in more detail in Section 4.0. Soil data was obtained from a USDA Soils Report, and gives a hydrologic soil group A or B for the site. In an effort to be conservative, soil group B was used for the analysis. The soils report is included in Appendix B. The described methods/tools used in the analysis, are in accordance with Weld County's storm drainage criteria. 3.2 Land Cover Hydrologic Properties Curve numbers and corresponding Manning's N values, for hydrologic soil group B, were assigned to the various land cover types found on the project, both existing and proposed , and are presented in Table 3-1 . Table 3-1 : Land Cover Hydrologic Properties Land Cover Type Curve Number Manning's N Pasture or Range Land, Poor 68 0. 15 Condition (Existing Site) Open Graded Aggregate Topping Over Compacted Base (Substation 76 0.024 Yard) Compacted Base Material 78 0.024 (Driveways) Pavement/Concrete 98 0.015 3.3 Weighted Design Values Utilizing the land cover hydrologic properties presented above, a weighted curve number and Manning's N value was calculated for each of the sub-basins, presented in Section 2.0 to be used for analysis. Table 3-2 presents the weighted design values for existing DM AG 3-1 Milton Substation Drainage Report conditions and Table 3-3 presents the weighted design values for proposed conditions. Detailed calculations can be found in Appendix C. Table 3-2: Existing Sub-Basin Weighted Design Values Total Area Weighted Weighted Sub-Basin (Acres) Manning's N Curve Number Northern Area A 8.37 0.15 68 Southern Area 19.94 0. 15 68 Off-Site 17.07 0. 15 68 Table 3-3: Proposed Sub-Basin Weighted Design Values Total Area Weighted 1 Weighted Sub-Basin (Acres) Manning's N I Curve Number Northern Area 8. 11 0. 142 68.6 Southern Area 12.98 0.149 68. 1 Substation Yard- North 3.37 0.024 76 Substation Yard-South 3.84 0.024 76 Off-Site 17.07 0. 15 68 3-2 Milton Substation Drainage Report 4.0 Drainage Facility Design 4.1 Historical Drainage Per Weld County requirements, the historical discharge rate from the 10 year — 1 hour storm shall be utilized to determine the allowable discharge rate for the proposed improvements assuming the existing site has 2% imperviousness. Values presented in Table 3-2 were used in the model to calculate a historical discharge rate for all three existing sub-basins. Table 4-1 presents the discharge rates for the existing sub-basins for both the 10-year and 100-year 1 -hour storm events. Table 4-1 : Existing Sub-Basin Discharge Values g a ues 10-Year 100-Year I Sub-Basin Discharge Discharge (CFS) (CFS) Northern Area 0.96 7.85 Southern Area 2.38 19.17 Off-Site 2.03 16.41 4.2 Proposed Drainage Values presented in Table 3-3 were utilized in the model to calculate the runoff for the proposed conditions as well as to size the outlet structure and verify the adequacy of the existing on-site pond. The off-site sub-basin will be routed through the property as the existing topography does not allow routing of the run-on around the property. All runoff from the southern portion of the project, including the run-on, will be routed through the detention pond and outlet structure. Runoff from the northern portion of the project will continue to follow historical discharge locations. The existing on-site retention pond is intended to be used in its current state with the addition of an outlet to provide the required WQCV and 100-year 1 -hour storm detention . Based on the survey, the existing pond has a stage-storage relationship that is represented in Table 4-2. Table 4-2: Detention Pond Stage-Storage Table Elevation Surface Area (Sq. Ft.) 4804 6,052 4805 11 ,800 4806 18,310 4807 25,920 4808 34,350 4809 43,834 4810 56,520 Dm eci. 4-1 Milton Substation Drainage Report Utilizing the Weld County Water Quality Feature Calculation spreadsheet, the imperviousness of the contributing area was calculated to be 15.6% which required a water quality capture volume of 0.096 acre-feet. Utilizing the imperviousness, site characteristics, and pond geometry, the required WQCV, according to Urban Drainage, was calculated to be 0. 181 acre-feet. In an effort to be conservative, the value obtained from the Urban Drainage calculations was used for design of the outlet structure. The Urban Drainage Design Procedure Form for Extended Detention Basins spreadsheet was utilized to design the outlet structure to not only retain the correct WQCV but to also discharge at or less than the required historic discharge rate presented in Table 4-1 . The spreadsheet showing the detailed calculations can be found in Appendix C. The design of the outlet structure is detailed in the grading drawings provided in Appendix A. The model of the proposed site conditions was utilized to calculate discharge flow rates from the substation site in order to size the interior drain lines. Table 4-3 presents the hydraulic capacity of the interior drain line system and the required capacity to discharge flow from the substation yard . Detailed design of the interior drain lines is provided in Appendix A. Table 4-3: Interior Drain Line Hydraulic Capacity [-Pipe Diameter Total Capacity Required Flow Remaining Drainage Feature (in) (cfs) Capacity (cfs) Capacity (cfs) North Discharge Pipe 18 10.5 9.91 0.59 South Discharge Pipe 18 23.4 9.67 13.73 Table 4-4 presents the discharge rates for the proposed sub-basins for both the 10-year and 100-year 1 -hour storm events. Table 4-4: Proposed Sub-Basin Discharge Values 1 10-Year 100-Year Sub-Basin Discharge Discharge (CFS) (CFS) Northern Area 1 .00 7.93 Southern Area 1 .55 15.78 Substation Yard-North 2.94 9.91 Substation Yard-South 2.48 9.67 Off-Site 2.03 17.07 Utilizing the flow rates presented above, the model was also utilized to analyze the adequacy of the existing on-site pond. With the addition of the outlet structure, the pond provided the WQCV of 0. 181 Acre-feet at a depth of 1 .4 feet and resulted in a 100-year storm depth of 2 .33 feet. This allows approximately 7.66 additional feet of freeboard in the pond, exceeding the required 1 foot according to the Weld County Code. The Southern Area, Substation Yard-North, Substation Yard-South , and Off Site sub basins all drain to the pond and the combined discharge rates leaving the pond, through the outlet structure, are presented in Table 5-1 . nv 4-2 Milton Substation Drainage Report 5.0 Conclusions 5. 1 Drainage Concept The drainage design has been prepared using sound engineering judgement and practices and will provide an effective means of controlling runoff on the project site as well as protect the site from damage. The design has been completed according to Weld County Code and will result in no downstream impacts to any people or structures. Historic flow paths, discharge rates, and water quality have been maintained. 5.2 Compliance with the Weld County Code Per Weld County requirements, the historical discharge rate from the 10 year — 1 hour storm shall be utilized to determine the allowable discharge rate for the proposed improvements. To demonstrate compliance with this requirement, both the existing and proposed conditions were combined into two overall sub-basins; northern and southern. The off-site discharge was added to the southern area for both existing and proposed . Table 5-1 presents the overall discharge rates for the northern and southern areas. Table 5-1 : Overall Sub-Basin Discharge Values 10-Year Discharge 100-Year Discharge Sub-Basin (CFS) (CFS) Existing Proposed Existing Proposed Northern Area 0.96 1 .00 7.85 7.93 Southern Area 4.41 0.56 35.58 19.58 Total 5.37 1 .56 43.43 27.51 Table 5-1 illustrates the proposed condition discharge rate is substantially less than the required discharge rate from the 10-year, 1 -hour storm event, resulting in compliance with the Weld County Code. As discussed in previous sections, the detention pond has also been designed to meet all criteria set forth in the Weld County Code. DM C 5-1 Milton Substation Drainage Report 6.0 References United States Department of Agriculture Natural Resources Conservation Service. Web Soil Survey Urban Drainage and Flood Control District. Storm water Best Management Practice Design Workbook, Version 3.03, December 2013. Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volume 1-3, June 2001 . Weld County. Weld County Water Quality Feature Calculation Spreadsheet Weld County Code. Weld County, Colorado, September 6, 2008. Weld County Engineering and Construction Criteria. Weld County Public Works Department, April 2012. NOAA Atlas 14, Volume 8, Precipitation-Frequency Atlas of the United States. U .S . Department of Commerce, 2013. ,� 6-1 " Milton Substation Drainage Report I Appendix A Site Maps & Design Drawings INC Milton Substation Drainage Report A0 ♦M ,flla, LW IY. 1112e/Gh '��•••• •J.4.1 SNISV9 ens intureSV SMa SNOIIIaNO0 ONILSIX3 $ • wuls1f103 014M .1 y ti l iis ,• - Y- pi 'c NOI1V1S911S NO11Ik 41 l• ONI 'NOISSIWSNVL118 NOIlV2d3N39 3011S-IS1 v IN r� VI i n-- < lI I o n--- I I !o / __ Lij < 1 . II - fa • •YO JAW 1:36.20104 00100•.asna,P1.. 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I i 2 II P I : ® 05@® .(9) ® @ ® ® ® CI ETGil 1 1 P I 1li 1 1 1 pp 1 1e. � `� L 4A • Ill I il /I t 1 V el% : 1 f. 111. ._.Ll.__•—• -.—.. _ _•_•.`.•.�.,.J.." ' " ' , ..____ _.._�I , ..II: / • . \� ILi� I It Ii . • er l ®- X11 ® , i 1 I I1\11 1 r , i - I � I . ® cliff--U II F.- a3 1INtt 3 /‘ I,�. 'AI 1 1 ,r. • •I - t ei - Li • 1 I 1 -1113.2 .2 ,I • 1 - I) - " IIF•1: irj• t it I I j°_` Fey l 4" 4 •A l \ . a .3. )[ I ` 1 k4 rli _ _ , : 1 ,t at 1a� 11 � I I 1 1 / I — ' ` t �,... _ » 1 j1/21, _ 1 1 1 I I is • — l 1 1 ,v• y • s, - .....I ft ,,s / . l 11 i , ......„ .. . ,11.1 � ` J filial \ I Appendix B NRCS Soils Report Milton Substation Drainage Report USDA United States A product of the National Custom Soil Resource a. Department of Cooperative Soil Survey, Agriculture a joint effort of the United Report for States Department of RC S Agriculture and other VVe I d C o u n t Federal agencies, State ,7 Natural agencies including the Colorado , Resources Agricultural Experiment Conservation Stations, and local Service participants Southern Part Milton Substation • 1. � d•� 1 1 , I It i : ' " rs' II N. 4;:, - -' 1 * 1 it • Iv . . . . ... lir It• 1 a . le '1St . ti I ..7 ..? 1 se l `tik =k ' . - f ;. 0 8.000 ft t _ = L. - March 16, 2015 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/portal/ nresimain/soils/health/) and certain conservation and engineering applications. For more rietailed information contact local Service Center (htt_ :// .. � .,. .. ..nvv information,Vil, contact your local! USDA Service (http:// offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres142p2_053951 ). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (NRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information , political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means 2 for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD)_ USDA is an equal opportunity provider and employer. 3 I Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 7 Soil Map 8 Legend 9 Map Unit Legend 10 Map Unit Descriptions 10 Weld County, Colorado, Southern Part 12 38—Nelson fine sandy loam, 3 to 9 percent slopes 12 72—Vona loamy sand, 0 to 3 percent slopes 13 73—Vona loamy sand, 3 to 5 percent slopes 14 References 16 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil-vegetation-landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil scientists classified and named the soils in the survey area, they compared the 5 Custom Soil Resource Report individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping , design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil- landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil-landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. 6 Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 7 Custom Soil Resource Report 1 Soil Map 74, A Si 533440 533510 S33580 533650 533710 533790 533860 40° 18'45 N • 40° 18'4511 N k Ai SI I. . / 4 1 ri i ?j i $.1.,. Ei / , ii 'tip . C J 1" i , o o q . '7'-I 47 rl 4,Y i .lo it r `' 'I - lie4194 • "cs: Ai . _._ ---- ____ Y s! `N . 0 . 1 f f , i . / H I I 40° 18'24"N 40° 18'24''N 533440 533510 533580 533650 533720 533790 533860 1r zt 3 � N Map Scale: 1:3,060 if printed on A portrait(8,5"x 11")sheet. to el ,Meters IA N 0 45 90 180 270 g Fret A a0 200 400 600 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 8 O a) a1:12) p c) M on co C O C a) o co co O O CO •' o (0 o b. 2 t c:4 z u) m > C) n) U . ,r LP Q CD U) Co >, 0co a 26 2of 2 io a op , U) oC J _ E 0 Q) coO c -o 3t0 (0 4- ® co ') ° OL) N E '= a N O a U j o J , .. - ± 'C a) N -le 0 Z a) a raa W m O 0 ` u� t L `) U m L O E �- O M C a0 . 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A 7 Q. d 0 a. ).' 0 o a (Ca •C 0 co >, a) In Q m �i 3 o , w > > V as c aa)i 0 aa)) Y c v m Y a) •g H O 'o 'O c .ni p t0 O c0 (0 C > f0 C to 0) UO C > C •p 0 Cl) co v) .o m co U v 0 C) 3 m a cr cn n enn Fn v) cnn r a. c ra � no U3 < U) Custom Soil Resource Report Map Unit Legend Weld County, Colorado, Southern Part (CO618) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy loam, 3 to 9 0.3 0.8% percent slopes 72 Vona loamy sand, 0 to 3 percent 7.0 22.9% slopes 73 Vona loamy sand, 3 to 5 percent 23.3 76.3% slopes Totals for Area of Interest 30.6 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments 10 Custom Soil Resource Report on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha- Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 11 Custom Soil Resource Report Weld County, Colorado, Southern Part 38—Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost-free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transacts of the mapunit. Description of Nelson Setting Landform: Plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam / 13 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Natural drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 10 percent Salinity, maximum in profile: Nonsaline (0.0 to 2.0 mmhos/cm) Available water storage in profile: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: Sandy plains (R067BY024CO) Minor Components Thedalund Percent of map unit: 10 percent 12 Custom Soil Resource Report Terry Percent of map unit: 5 percent 72—Vona loamy sand, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 363r Elevation: 4,600 to 5,200 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 55 degrees F Frost-free period: 130 to 160 days Farmland classification: Farmland of local importance Map Unit Composition Vona and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Vona Setting Landform: Terraces, plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium and/or eolian deposits Typical profile H1 - 0 to 6 inches: loamy sand H2 - 6 to 28 inches: fine sandy loam H3 - 28 to 60 inches: sandy loam Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): High (1 .98 to 6.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/cm) Available water storage in profile: Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: Sandy plains (R067BY024CO) 13 Custom Soil Resource Report Minor Components Remmit Percent of map unit: 10 percent Valent Percent of map unit: 5 percent 73—Vona loamy sand, 3 to 5 percent slopes Map Unit Setting National map unit symbol: 363s Elevation: 4,600 to 5,200 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 55 degrees F Frost-free period: 130 to 160 days Farmland classification: Not prime farmland Map Unit Composition Vona and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Vona coifing Landform: Terraces, plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Alluvium and/or eolian deposits Typical profile H9 - 0 to 6 inches: loamy sand H2 - 6 to 28 inches: fine sandy loam H3 - 28 to 60 inches: sandy loam Properties and qualities Slope: 3 to 5 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): High (1 .98 to 6.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 15 percent Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/cm) Available water storage in profile: Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated): 3e 14 Custom Soil Resource Report Land capability classification (non irrigated): 4e Hydrologic Soil Group: A Ecological site: Sandy plains (R067BY024CO) Minor Components Remmit Percent of map unit: 8 percent Valent Percent of map unit: 7 percent 15 I References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin , L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31 . Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W. , and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. National Research Council. 1995. Wetlands: Characteristics and boundaries, Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/nres/ detail/national/soils/?cid=nrcs142p2 054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http://www.nrcs.usda.gov/wps/portal/ nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http://www.nres.usda.gov/wps/ portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1 . United States Department of Agriculture, Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nrcs142p2_053374 United States Department of Agriculture, Natural Resources Conservation Service. National range and pasture handbook. http://www.nrcsausda.gov/wps/portal/nrcs/ detail/national/landuse/rangepasture/?cid=stelprdb1043084 16 Custom Soil Resource Report United States Department of Agriculture, Natural Resources Conservation Service. National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/ nrcs/detail/soils/scientists/?cid=nrcs142p2_054242 United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U .S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soilsl? cid=nres 142p2_053624 United States Department of Agriculture, Soil Conservation Service. 1961 . Land capability classification. U.S. Department of Agriculture Handbook 210. http:// vvww.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf 17 I Appendix C Site Specific Physical Design Properties Emv Milton Substation Drainage Report Milton Drainage Design Existing Conditions Total Area Area Name (sf) (acres) Flow Length Width (A/L) Slope (X) North Area 364448 8.37 500 728.896 2.5 Southern Area 868525 19.94 500 1737.05 2 75 Off-Site 743537 17.07 500 1487.074 2.75 Land Cover Type Curve Number Mannings N D-Store Pervious Pasture or Range Land, Poor Condition 68 0.15 0.15 Open Graded Aggregate Topping Over Compacted Base 76 0 024 0.05 Compacted Base Material 78 0.024 0 Pavement/Concrete 98 0 015 0 Roughness Coefficient and Curve Number Analysis North Area Description Total Area (ac) Manning's'n' fftla CN A*CN Native 8 37 0.15 1.2550 68 568.92/1 0.015 0.0000 98 0 0000 0 0.0000 0 0.0000 sum 1.2550 568 9271 Total Area (ac) 8.367 Weighted 0.15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 69 Dstore Pervious (in) 0.15 South Area Description Total Area (act Manning's'n' A*n CN A*CN Native 19.94 0.15 2.9908 68 1355.8747 0.015 0.0000 98 0.0000 0 024 0.0000 87 0 0000 sum 2 9908 1355.8242 Total Area (ac) 19.939 Weighted 0.15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 Dstore Pervious (In) 0.15 Off-Site Description Total Area (a4) Manning's'r A*n CN A*CN Undisturbed 17.07 0.15 2.5604 68 1160.7097 0,015 0-0000 98 0.0000 0 024 0-0000 87 0A000 sum 2.5604 1160.7097 Total Area (at) 17.069 Weighted 0.15 68 Weighted Manning's 'n' 0,150 Weighted Curve Number 68 Dstore Pervious (In) 0.15 Milton Drainage Design Proposed Conditions Total Area Area Name (sf) (acres) Flow Length Width (A/L) Slope (%) North Area 353410 8 11 500 706.82 2.5 Southern Area (MiddleArea and Pond) 565416 12.98 500 1130.832 2 75 Substation North 146804 3 370 200 734.02 1 Substation South 167329 3.841 250 669.316 1 Off-Site 743537 17.07 500 1487.074 2.75 ' Land Cover Type Curve Number Mannings N D-Store Pervious Pasture or Range 1 and, Poor Condition 68 0 15 0.15 Open Graded Aggregate Topping Over Compacted Base 76 0.024 0.05 ", Compacted Base Material 78 0 024 0 Pavement/Concrete 98 0.015 0 Roughness Coefficient and Curve Number Analysis Northern Area Description Iota)Area (act Manning's 'n' /ken CN A*CN Native 7.61 0.15 1.1416 68 517.5478 Driveway 0.50 0.024 0.0121 78 39.1/01 0 0.0000 0 0.0000 sum 1.1537 556 7179 Total Area (ac) 8.113 Weighted 0 1422009R5 68 61896947 Weighted Manning's 'n' 0.142 Weighted Curve Number 68.62 Dstore Pervious (in) 0.15 Substation Yard-North Description Total Area fact Manning's 'n' Mn CN A*CN Yard + Apron 3.37 0,024 0.0809 76 256.1319 sum 0.0809 256 1319 Total Area (ac) 3.170 Weighted 0.024 76 Weighted Manning's 'n' 0.024 Weighted Curve Number 76 Dstore Pervious (In) 0.15 Substation Yard-South Description Total Area (act Manning's 'n' Mn CN A*CN Yard + Apron 3.84 0.024 0.0922 76 291.9422 sum (1.0922 291 9422 Total Area (ac) 3.841 Weighted 0.024 76 Weighted Manning's 'n' 0.024 Weighted Curve Number 76 Dstore Pervious (In) 0.15 Southern Area Description Total Area (act Manning's'n' Mn CN A"CN Native 12,91 0.15 1,9363 68 877.7729 Driveway 0.07 0.024 0.0017 78 5.5957 sum 1.9380 883 3686 Total Area (ac) 12.980 Weighted 0.14930361 68.05526904 Weighted Manning's 'n' 0.149 Weighted Curve Number 68.06 Dstore Pervious (in) 0.15 Off Site Description Total Area (ac) Manning's 'n' Mn CN A*CN Native 17 07 0.15 2.5605 68 1160.7600 sum 2,5605 1160.7600 Total Area (ac) 17.070 Weighted 0.15 68 Weighted Manning's 'n' 0.150 Weighted Curve Number 68 Dstore Pervious (in) 0.15 Water Quality Feature Calculations Weld County Planning Services/Engineering Date ######## Enter Project Name : Milton Substation - Draining to Pond Enter Case Number: Surface Area (SF) Area (acres) % Impervious Roof 0 0.00 90% 0.9 Paved 0 0.00 100% 1 .0 Gravel/Crushed Asphalt 314,133 7.21 40% 0.4 Grass/Undeveloped 12.98 2% 0.02 Total Site (Acres) 20.19 Note: 1 ac = 43,560 sf Weighted Imperviousness (i) = 0.156 WQCV=a'(0 91i3-1. 1912 +0 78x) 6-hr drain time a = 0.7 12-hr drain time a = 0.8 — 24-hr drain time a = 0.9 40-hr drain time a = 1_0 Water Quality Calulation Volume (WQCV) = 0.0960 WoCU Required storage =I 1Z }Area) Required storage = 0.1616 acre*feet 7,039 to ft Design Procedure Form: Extended Detention Basin (EDB) Sheet 1 of 4 Designer: David Schield' Company: Del-Mont Consultants, Inc. Date: May 29, 2015 Project: Milton Substation Location: Weld County, CO 1. Basin Storage Volume A) Effective Imperviousness of Tributary Area, la la = 15.6 B) Tributary Area's Imperviousness Ratio (i = la! 100 ) i = 0.156 C) Contributing Watershed Area Area = 20.190 ac D) For Watersheds Outside of the Denver Region, Depth of Average d6 = 0.40 in Runoff Producing Storm Choose One E) Design Concept (Select EURV when also designing for flood control) IS Water Quality Capture Volume (WQCV) Q Excess Urban Runoff Volume (EURV) F) Design Volume (1.2 WQCV) Based on 40-hour Drain Time %/DESIGN= 0.194 ac-R (VOESION = (1.0 ` (0.91 ' 13- 1.19 ' 1`+ 0.78 ` 1)/ 12 ' Area ' 1.2) G) For Watersheds Outside of the Denver Region, VDESIGN OTHER= 0.181 ac-ft (Water Quality Capture Volume (WQCV) Design Volume (Vwocv OTHER = (do'(VDESION/0-43)) H) User Input of Water Quality Capture Volume (WQCV) Design Volume %/DESIGN USER= ac-ft (Only if a different WQCV Design Volume is desired) Choose One I) Predominant Watershed NRCS Soil Group O A QR QC/D 2. Basin Shape: Length to Width Ratio L : W = 2 0 1 (A basin length to width ratio of at least 2:1 will improve TSS reduction.) 3. Basin Side Slopes A) Basin Maximum Side Slopes Z = 10.00 ft / ft (Horizontal distance per unit vertical, 4:1 or flatter preferred) 4. Inlet A) Describe means of providing energy dissipation at concentrated inflow locations: Detention Pond Sizing_UD-BMP, EDB 5/29/2015, 8:07 AM Design Procedure Form: Extended Detention Basin (EDB) Sheet 2 of 4 Designer: David Schieldt Company: Del-Mont Consultants, Inc. Date: May 29, 2015 Project: Milton Substation Location: Weld County, CO 5. Forebay A) Minimum Forebay Volume VFMIN = 0.003 ac-ft NFMIN = 2% of the WQCV) B) Actual Forebay Volume VF = No Forebay ac-ft C) Forebay Depth DF = No Forebay in DF > DF MAXIMUM (DF = 18 inch maximum) D) Forebay Discharge i) Undetained 100-year Peak Discharge Q,00 = N/A cfs ii) Forebay Discharge Design Flow OF= #VALUEI cis (QF = 0.02 ' Qloo) E) Forebay Discharge Design Choose One Q Berm With Pipe (flow too small for berm wl pipe) Q Wall with Rect Notch O Wall with V-Notch Weir F) Discharge Pipe Size (minimum 8-inches) Calculated Do = in G) Rectangular Notch Width Calculated WN = in CA...,5e Oft 6. Trickle Channel No Trickle Channel ®Concrete A) Type of Trickle Channel Q Soft Bottom F) Slope of Trickle Channel S = 0.0100 ft /ft 7. Micropool and Outlet Structure A) Depth of Micropool (2 5-feet minimum) DM = 2.5 ft B) Surface Area of Micropool (10 f minimum) AM = 10 sq ft C) Outlet Type Choose One ®Orifice Plate O Other (Describe): O) Depth of Design Volume (EURV or 1.2 WQCV) Based on the Design H = 1.40 feet Concept Chosen Under 1.E. E) Volume to Drain Over Prescribed Time WQCV = 0.151 ac-ft F) Drain Time To = 40 hours (Min To for WQCV= 40 hours; Max To for EURV= 72 hours) G) Recommended Maximum Outlet Area per Row, (AD) A0= 0.47 square Inches H) Orifice Dimensions: i) Circular Orifice Diameter or D,x,rk0= 3 /4 inches f) Number of Columns nc = 1 number J) Actual Design Outlet Area per Row (A0) AD= 0.44 square inches K) Number of Rows (nr) n, = 4 number L) Total Outlet Area (A«) Aa = 1.9 square inches Detention Pond Sizing_UD-BMP, EDB 5/29/2015, 8:07 AM IDesign Procedure Form: Extended Detention Basin (EDB) Sheet 3 of 4 Designer: David Schieldt Company: Del-Mont Consultants,inc. Date: May 29, 2015 Project: Milton Substation Location: Weld County, CO 6 Initial Surcharge Volume A) Depth of Initial Surcharge Volume Des = 6.0 in ' (Minimum recommended depth Is 4 inches) C) Initial Surcharge Provided Above Micropool Vs 5.0 cu ft Lnoose one 9. Trash Rack IlD Circular (up to 1-1/4" diameter) A) Type of Water Quality Orifice Used Q Circular(greater than 1-1/4" diameter) OR Rectangular(2" high) B) Water Quality Screen Open Area: A, = Aol ' 38.5•(e-°°950) At = 67 square inches C) For 1-1/4"", or Smaller, Circular Opening (See Fact Sheet T-12): i) Width of Water Quality Screen and Concrete Opening (Wowing) W,ee,,,,9 = 12.0 inches ii) Height of Water Quality Screen (Hrn) HIR = 44.8 inches Choose One iii) f ype of Screen, Describe if"Other" Q 5,5. Well Screen with 60% Open Area` QOther (Describe): Choose One O Aluminum Arnico-Klernp SR Series (or equal) O Other(Describe): inches Detention Pond Sizing_UD-BMP, EDB 5/29/2015, 8:07 AM ( Design Procedure Form: Extended Detention Basin (EDB) Sheet 4 of 4 Designer: David Schieldt Company: Del- Mont Consultants, Inc. Date: May 29, 2015 Project: Milton Substation Location: Weld County. CO 10. Overflow Embankment A) Describe embankment protection for 100-year and greater overtopping: See design drawings B) Slope of Overflow Embankment Ze = ft / ft (Horizontal distance per unit vertical, 4:1 or flatter preferred) r'hnose One 11. Vegetation O Irrigated ® Not irrigated 12. Access A) Describe Sediment Removal Procedures Notes: Detention Pond Sizing_UD-BMP, EDB 5/29/2015, 8:07 AM Appendix D I SWMM Modeling Results Dm€ Milton Substation Drainage Report Milton Substation - Existing Conditions - 10 Year 1 Hour Project Description File Name Milton Exlsting.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Mar 16, 2015 00:00:00 End Analysis On Mar 18, 2015 00:00:00 Start Reporting On Mar 16, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff(Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 3 Nodes 3 Junctions 0 Outfalls 3 Flow Diversions 0 Inlets 0 Storage Nodes 0 Links 0 Channels 0 Pipes 0 Pumps 0 Orifices 0 Weirs .......................... 0 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (inches) 1 Rain Gage-01 Time Series 10YR-1HR Cumulative inches Colorado Weld 10 1.41 Florida DOT 1-hr Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (in) (in) (ac-in) (cfs) (days hh:mm:ss) I Northern 8.37 2.00 68.00 2.5000 729.00 0.0150 0.1500 1.41 1.2510 0.11 0.92 0.96 0 00:32:38 2 Off-Site 17.07 2.00 68.00 2.7500 1487.00 0.0150 0.1500 1 .41 1.2510 0.11 1.91 2.03 0 00:31:43 3 Southern 19.94 2.00 68.00 2.7500 1737.00 0.0150 0.1500 1.41 1.2510 0.11 2.23 2.38 0 00:31:43 1 Milton Substation - Existing Conditions - 10 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) (ft') (cfs) (ft) (ft) (ft) (days hh:mm) (ac-in) (min) 1 NE Out Outfall 4812.00 0.00 0.00 2 Off-SiteOut Outfall 4820.00 0.00 0.00 3 SouthernOut Outfall 4800.00 0.00 0.00 Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin Hydrology Subbasin : Northern Input Data Area (ac) 8.37 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 729.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soli/Surface Description (acres] Group Number 8.37 - 68.00 Composite Area & Weighted CN 8.37 68.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (In) 1.2510 Total Runoff (in) 0.11 Peak Runoff(cfs) 0.96 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:32:38 Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Northern Rainfall Intensity Graph 31 3 f 29 28 27 26 25 24 23 22 21 2 19 C 1_8 s c 17 — 1.6 �o 15 'ro' 1.4 o 1.3 1 .2 1 . 1 1 09 08 07 06 05 04 03 0.2 01 4. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 1 0 95 09 0 85 08 0 75 07 065 06 471 0 55 c 0.5 a 0.45 0.4 0 35 03 0.25 02 0 15 01 005 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Off-Site Input Data Area (ac) 17.07 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity(in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1487.00 Impervious Area Manning's Roughness 0.0150 ' Pervious Area Manning's Roughness ... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Sod/Surface Description (acres) Group Number - 17.07 - 68.00 Composite Area & Weighted CN 17.07 68.00 Subbasin Runoff Results Total Rainfall (In) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2510 Total Runoff (in) 0.11 Peak Runoff (cfs) 2.03 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:31:43 Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Off-Site Rainfall Intensity Graph 34 32 3 f 28 26 2.4 22 2 18 c 1.6 .� 0✓ 1 4 12 1 08 06 04 02 l 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 21 - 2 19 I 1B 17 16 15 14 13 av, 12 I 11 o t 1 C c 09 08 0.7 06 05 0.4 03 I \* 02 01 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Southern Input Data Area (ac) 19..94 Impervious Area (°/0) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1737.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 19.94 - 68.00 Composite Area & Weighted CN 19.94 88.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2510 Total Runoff (in) 0.11 Peak Runoff (cis) 2.38 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:31:43 Milton Substation - Existing Conditions - 10 Year 1 Hour Subbasin : Southern Rainfall Intensity Graph 34 32 3 f 28 26 24 22 2 1 .8 f° w 16 � I CE 1.4 1 .2 1 0.8 0.6 0.4 02 1 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 24 23 22 21 2 19 1 .8 17 16 15 1 4 U) O 1 .3 12 O C 11 1 09 08 07 06 05 04 03 02 01 0 2 4 6 6 10 12 14 16 18 20 22 24 26 26 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Existing Conditions - 100 Year 1 Hour Project Description File Name Milton Existing.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady Stale Analysis Time Periods YES Analysis Options Start Analysis On Mar 16, 2015 00:00:00 End Analysis On Mar 18, 2015 00:00:00 Start Reporting On Mar 16, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 3 Nodes 3 Junctions 0 Outfalls 3 Flow Diversions 0 Inlets 0 Storage Nodes 0 Links 0 Channels • C0 Pipes 0 Pumps 0 Orifices 0 Weirs 0 Outlets . .... 0 Pollutants 0 Land Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (inches) t Rain Gage-01 Time Series 100YR-1HR Cumulative Inches Colorado Weld 100 2.70 Florida DOT 1-hr Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (in) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Northern 8.37 2.00 68.00 2.5000 729.00 0.0150 0.1500 2.70 1.9350 0.72 6.01 7.85 0 00:25:10 2 Off-Site 17.07 2.00 68.00 2.7500 1487.00 0.0150 0.1500 2.70 1.9310 0.72 12.32 16.41 0 00:24:27 3 Southern 19.94 2.00 68.00 2.7500 1737.00 0.0150 0.1500 2.70 1.9310 0.72 14.40 19.17 0 00:24:27 Milton Substation - Existing Conditions - 100 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) (ft') (cfs) (ft) (ft) (ft) (days hhmm) (ac-In) (min) 1 NE Out Outfall 4812.00 0.00 0.00 2 Off-SiteOut Outfall 4820.00 0.00 0.00 3 SauthernOut Outfall 4800.00 0.00 0.00 I Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin Hydrology Subbasin : Northern Input Data Area (ac) 8.37 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope C/0) 2.5000 Equivalent Width (ft) 729.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness :.......... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soll/Surface Description (acres) Group Number - 8.37 - 68.00 Composite Area & Weighted CN 8.37 68.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (In) 0.0000 Total Infiltration (in) 1.9350 Total Runoff (in) 0.72 Peak Runoff (cfs) 7.85 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:25:10 Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Northern Rainfall Intensity Graph 6 5.8 r 56 5.4 52 5 4.8 46 4.4 4.2 4 38 36 s 34 v 32 To 3 c 28 tY 2 6 2,4 2.2 2 18 16 14 1.2 1 08 06 04 0.2 1 D 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 85 8 75 7 65 6 55 5 cn w " 45 w c 4 35 3 25 2 15 1 05 0 2 4 6 6 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Off-Site Input Data Area (ac) 17.07 Impervious Area (%) 2.00 Weighted Curve Number 66.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1487.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soli Curve Soil/Surface Description (acres) Group Number - 17.07 - 68.00 Composite Area & Weighted CN 17.07 68.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.9310 Total Runoff (in) 0.72 Peak Runoff (cfs) 16.41 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:24:27 Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Off-Site Rainfall Intensity Graph 62 6 5.8 j 56 54 52 5 4.8 46 44 42 4 36 s 36 34 3.2 To 3 28 (c 2.6 2.4 22 2 • 18 16 • 1.4 12 1 08 06 04 02 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 18 17 16 15 14 13 12 11 F. 10 U t 9 0 c CC a 7 6 5 4 3 2 I 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Southern Input Data Area (ac) 19.94 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1737.00 Impervious Area Manning's Roughness ... 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 19.94 - 68.00 Composite Area & Weighted CN 19.94 68.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.9310 Total Runoff(in) 0.72 Peak Runoff(cfs) 19.17 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:24:27 Milton Substation - Existing Conditions - 100 Year 1 Hour Subbasin : Southern Rainfall Intensity Graph 62 6 5.8 r 56 54 52 5 4.8 46 44 4.2 4 38 r 3.6 C 34 32 io 3 •2 28 cc 26 24 22 2 18 16 14 12 1 08 06 0.4 02 1 0 2 4 6 6 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Time (hrs) Runoff Hydrograph 20 19 18 17 16 15 14 13 12 11 v 10 C C z g 8 7 6 5 4 321 1 0 2 4 6 8 10 12 14 16 1S 20 22 24 26 28 30 32 34 36 38 40 42 44 46 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Project Description File Name Milton Proposed -With Pipes.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Mar 16, 2015 00:00:00 End Analysis On Mar 19, 2015 00:00:00 Start Reporting On Mar 16, 2015 00:00:00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 4 5 Nodes 10 Junctions 7 Outfalls 2 Flow Diversions 0 Inlets 0 Storage Nodes 1 Links 9 Channels .......... ...... ... .._ . ._ . . 2 Pipes 5 Pumps 0 Orifices 2 Weirs 0 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (inches) 1 Rain Gage-01 Time Series 10YR-1HR Cumulative inches Colorado Weld 10 1.41 Florida DOT 1-hr Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) 04) (ft) (in) (in) (in) (ac-in) (cfs) (days ►ih:mm:ss) I Northern 8.11 2.00 68.60 2.5000 729.00 0.0150 0.1500 1.41 1.2450 0.12 0.95 1.00 0 00:32:02 2 Off-Site 17.07 2.00 68.00 2.7500 1487.00 0.0150 0.1500 1.41 1.2510 0.11 1.91 2.03 0 00:31:43 3 SouthemArea 12.98 2.00 68.00 2.7500 895.00 0.0150 0.1500 1.41 1.1480 0.26 3.40 1.55 0 00:36:30 4 SubstatlonNorth 3.37 0.00 76.00 1.0000 735.00 0.0100 0.0240 1.41 1.0030 0.36 1.21 2.94 0 00:08:21 5 SubstationSouth 3.84 0.00 76.00 0.5000 500.00 0.0100 0.0240 1.41 1.0230 0.34 1.29 2.48 0 00:14:00 I Milton Substation - Proposed Conditions - 10 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (ft) (ft) (It') (cfs) (ft) (ft) (ft) (days hh:mm) (ac-in) (min) 1 NorthPipeOut Junction 4814.46 4820.46 4814.46 4820.46 0.00 2.93 4815.00 0.00 5.46 0 00.00 0.00 0.00 2 Pondlnlet Junction 4804.00 4810.00 4804.00 0.00 0.00 6.45 4804.23 0.00 5.77 0 0O00 0.00 0.00 3 PondOut Junction 4801.00 4801 .50 0.00 0.00 0.00 0.56 4801 .22 0.00 1.78 0 0000 0.00 0.00 4 SouthPlpeOut Junction 4812.20 4818,20 4812.20 4818.20 0.00 2.47 4812.53 0.00 5.67 0 00 00 0.00 0.00 5 Structure - (79) Junction 4815.05 4818.24 4815.70 4818.24 0.00 2.94 4815.59 0.00 2.65 0 00'00 0.00 0.00 6 Structure - (81) Junction 4815.91 4818.10 4815.91 4818.10 0.00 2.48 4816.24 0.00 1.86 0 0000 0.00 0.00 7 Structure - (84) Junction 4816.34 4818.05 4816.34 4818.05 0.00 2.94 4816.88 0.00 1.17 0 00.00 0.00 0.00 8 NE Out Outfall 4812,00 1.00 4812.00 9 SouthernOut Outlet' 4800.00 0.56 4800.21 10 Pond Storage Node 4804.00 4810.00 4804,00 0.00 6.45 4805.46 0.00 0.00 Mihon Substation-Proposed Conditions- 10 Year I Hour Link Summary SN Element Element From To (Ou0et) Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/ Peak Flow Peak Flow Peak Flow Total Time Reported ID Type (Inlet) Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Surcharged Condition Node Elevation Elevation Ratio Total Depth Ratio lit) ft) fti Ch) (m (ds) (ds (Iti'sec) (ft) (min) 1 Link-01 Pipe Pondlnlet Pond 101.65 4804.00 4804.00 0.0000 0.000 0.0150 6.45 0.00 0.00 0.00 0.00 0.00 0.00 2 OuOetPipe Pipe PondOut SouthemOut 70.00 4601.00 4800.00 1.4300 24.000 0.0150 0.56 23.43 0.02 3.01 0.22 0.11 0.00 Calculated I 3 Pipe-(82) Pipe Structure- (84) Structure-(79) 128.21 4816.34 4815.05 1.0100 18,000 0.0130 2`,94 10.55 0.28 5.12 0.53 0.36 0.00 Calculated 4 Pipe-(86) Pipe Structure-(79) NorthPipeOut 58.87 4815.05 4814.46 1.0000 18.000 0.0130 2.93 10.51 0.28 5.10 0.53 0.36 0.00 Calculated 5 Pipe-(89) Pipe Structure-(81) SouthPipeOut 74.58 4815.91 4812.20 4.9700 18.000 0.0130 2A7 23.42 0.11 8.61 0.32 0.22 0.00 Calculated 6 NorlhemChannel Channel NorthPipeOut Pondlnlet 220.00 4814.46 4804.00 4.7500 6.000 0.0390 2.90 12.83 0.23 2.71 0,22 0.44 0.00 7 SouthemChannel Channel SouthPipeOut Pondlnlet 300.00 4812.20 4804.00 2.7300 6.000 0.0390 2.45 9.73 0.25 2.13 0.23 0.47 0.00 8 BleedDown Orifice Pond PondOut 4804.00 4801.00 4.000 0.16 9 OverflowGrate Orifice Pond PondOut 4804.00 4801.00 24.000 0.40 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin Hydrology Subbasin : Northern Input Data Area (ac) 8.11 Impervious Area (%) 2.00 Weighted Curve Number 68.60 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 729.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number - 8.37 - 68.60 Composite Area & Weighted CN 8.37 68.60 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2450 Total Runoff (in) 0.12 Peak Runoff(cfs) 1.00 Weighted Curve Number 68.60 Time of Concentration (days hh:mm:ss) 0 00:32:02 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : Northern Rainfall Intensity Graph 31 3 29 28 27 2.6 25 24 23 22 2.1 2 19 tti 18 c 17 1 .6 is 1 .5 14 0_ 1 3 12 11 1 09 0.8 07 06 05 OA 03 0.2 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 1 05 1 095 09 0 85 08 0 75 07 0 65 0.6 055 " 0.5 0_ 045 04 0.35 03 0.25 0.2 0 15 01 0 05 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : Off-Site Input Data Area (ac) 17.07 Impervious Area (Wa) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1487.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness . 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number - 17.07 - 68.00 Composite Area & Weighted CN 17.07 68.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.2510 Total Runoff (in) 0.11 Peak Runoff (cfs) 2.03 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:31:43 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : Off-Site Rainfall Intensity Graph 34 32 3 2.8 26 24 22 2 1 .8 16 0_ 1 .4 12 1 08 06 04 0.2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 21 2 19 18 ik 17 16 15 14 1 .3 N 1.2 C) -- 1 .1 0 1 c IX o.9 0.8 07 06 05 04 03 02 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SouthernArea Input Data Area (ac) 12.98 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 895.00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness ... .... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 12.98 - 68.00 Composite Area & Weighted CN 12.98 68.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.15 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.1480 Total Runoff (in) 0.26 Peak Runoff (cfs) 1.55 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:36:30 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SouthernArea Rainfall Intensity Graph 34 32 3 26 26 2.4 22 2 L 8 16 Co 14 12 1 08 06 0.4 02 0 5 10 15 20 25 3(1 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 17 16 15 1.4 1 .3 12 11 1 0.9 c OS I tY 0.7 0.6 0.5 04 0.3 0.2 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubstationNorth Input Data Area (ac) 3.37 Impervious Area (°/c.) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 1.0000 Equivalent Width (ft) 735.00 Impervious Area Manning's Roughness ... .... .. ...... ...._ . 0.0100 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 3.37 - 76.00 Composite Area & Weighted CN 3.37 76.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.0030 Total Runoff (in) 0.36 Peak Runoff (cfs) 2.94 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:08:21 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubstationNorth Rainfall Intensity Graph 34 32 3 2.8 26 2.4 22 2 L 18 16 0; 1 4 12 1 08 0.6 04 02 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 29 - 28 27 26 25 24 23 22 21 2 19 18 17 4- 16 15 0 14 r 1 .3 12 11 1 0.9 08 07 0.6 05 04 03 02 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubstationSouth Input Data Area (ac) 3.84 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 0.5000 Equivalent Width (ft) 500.00 Impervious Area Manning's Roughness 0.0100 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number • 3.84 - 76.00 Composite Area & Weighted CN 3.84 76.00 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.0230 Total Runoff (in) 0.34 Peak Runoff (cis) 2.48 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:14:00 Milton Substation - Proposed Conditions - 10 Year 1 Hour Subbasin : SubstationSouth Rainfall intensity Graph 34 32 3 2.8 26 24 22 -- 2 L 18 To 16 1 .4 1 .2 1 08 0.6 0,4 0.2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 26 25 24 23 22 21 2 19 18 17 1 .6 N I5 o 14 t 1 3 0 S 12 11 1 09 08 07 06 05 04 03 kes 02 01 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 10 Year 1 Hour Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max) {Max) Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft) (ft) (ft) (ft) (n) (ft) (ft) (ft') (in) 1 NorthPipeOut 4814.46 4820.46 6.00 4814.46 0.00 4820.46 0.00 0.00 0.00 2 Pondlntet 4804.00 4810.00 6.00 4804.00 0.00 0.00 -4810.00 0.00 0.00 3 PondOut 4801.00 4801.50 0.50 0.00 -4801.00 0.00 -4801.50 0.00 0.00 4 SouthPipeOut 4812.20 4818.20 6.00 4812.20 0.00 4818.20 0.00 0.00 0.00 5 Structure- (79) 4815.05 4818.24 3.19 4815.70 0.65 4818.24 0.00 0.00 0.00 6 Structure - (81) 4815.91 4818.10 2.19 4815.91 0.00 4818.10 0.00 0.00 0.00 7 Structure - (84) 4816.34 4818.05 1.71 4816.34 0.00 4818.05 0.00 0.00 0.00 Milton Substation - Proposed Conditions - 10 Year 1 Hour Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cis) (cis) (ft) (ft) (ft) (ft) (ft) (ft) (days hh-mm) (days hh:mm) (ac-in) (min) 1 NorthPlpeOut 2.93 0.00 4815.00 0.54 0.00 5.46 4814,46 0.00 0 00:42 0 00'00 0.00 0.00 2 Pondlnlet 6.45 1.55 4804.23 0.23 0.00 5.77 4804.00 0.00 0 00:49 0 00:00 0.00 0.00 3 PondOut 0.56 0.00 4801.22 0.22 0.00 1.78 4801.08 0.08 0 02:33 0 00:00 0.00 0.00 4 SouthPipeOut 2,47 0.00 4812.53 0.33 0.00 5.67 4812.20 0.00 0 00:48 0 00:00 0.00 0.00 5 Structure - (79) 2.94 0.00 4815.59 0.54 0.00 2.65 4815.05 0.00 0 00:42 0 00:00 0.00 0.00 6 Structure - (81) 2.48 2.48 4816.24 0.33 0.00 1.86 4815.91 0.00 0 00:48 0 00:00 0.00 0.00 ' 7 Structure - (84) 2.94 2.94 4816.88 0.54 0.00 1.17 4816.34 0.00 0 00:42 0 00:00 0.00 0.00 Milton Substation - Proposed Conditions - 10 Year 1 Hour Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape Height Width Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert Invert Drop Slope Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset (ft) (fl) (ft) (ft) (ft) (ft) (%) (ft) (ft) (cfs) 1 NorthamChannel 220.00 4814.46 0.00 4804.00 0.00 10.46 4.7500 Trapezoidal 0.500 8.000 0.0390 0.5000 0,5000 0.0000 0.00 No 2 SouthemChannel 300.00 4812.20 0.00 4804.00 0.00 8.20 2.7300 Trapezoidal 0.500 8.000 0.0390 0.5000 0.5000 0.0000 0.00 No Milton Substation - Proposed Conditions - 10 Year 1 Hour Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (mm) (ft) (min) 1 NorthernChannel 2.90 0 00:43 12.83 0.23 2.71 1.35 0.22 0.44 0.00 2 SouthemChannel 2.45 0 00:49 9.73 0.25 2.13 2.35 0.23 0.47 0.00 Milton Substation - Proposed Conditions - 10 Year 1 Hour Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft) (ft) (ft) (ft) (It) [ft) (%) (in) (in) (cfs) 1 Link-01 101.65 4804.00 0.00 4804.00 0.00 0.00 0.0000 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 1 2 OutletFipe 70.00 4801.00 0.00 4800.00 0.00 1.00 1.4300 CIRCULAR 24.000 24.000 0.0150 0.5000 0.5000 0.0000 0.00 No 1 3 Pipe - (82) 128.21 4816.34 0.00 4815.05 0.00 1.29 1.0100 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 4 Pipe - (86) 58.87 4815.05 0.00 4814.46 0.00 0.59 1.0000 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 5 Pipe - (89) 74.58 4815.91 0.00 4812.20 0.00 3.71 4.9700 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 Milton Substation - Proposed Conditions - 10 Year 1 Hour Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cis) (It/sec) (min) (ft) (min) 1 Link-01 6.45 0 00:49 0.00 0.00 0.00 0.00 0.00 0.00 2 OutletPipe 0.56 0 02 33 23.43 0.02 3.01 0.39 0.22 0.11 0.00 Calculated 3 Pipe - (82) 2.94 0 00:42 10.55 0.28 5.12 0.42 0.53 0.36 0.00 Calculated 4 Pipe - (86) 2.93 0 00:42 10.51 0.28 5.10 0.19 0.53 0.36 0.00 Calculated 5 Pipe - (89) 2.47 0 0048 23.42 0.11 8.61 0.14 0.32 0.22 0.00 Calculated I r Milton Substation - Proposed Conditions - 10 Year 1 Hour Storage Nodes Storage Node : Pond Input Data Invert Elevation (ft) 4804.00 Max (Rim) Elevation (ft) 4810.00 Max (Rim) Offset (ft) 6.00 Initial Water Elevation (ft) 4804.00 Initial Water Depth (ft) 0.00 Ponded Area (ft2) 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : Ex. Pond Stage Storage Storage Area Volume (ft) (ft=) (ft') 0 6052 0.000 1 11800 8926.00 2 18310 23981.00 3 25920 46096.00 4 34350 76231.00 5 43834 115323.00 6 56520 165500.00 Milton Substation - Proposed Conditions - 10 Year 1 Hour Storage Area Volume Curves Storage Volume (1*°) 0 20,000 40,000 60,000 8•,000 100,000 120,000 140,000 160,000 . 5.8 . • - • - - - - 5.8 5.6 - --»- . . . . . 5.6 5.4 • . . if 5.4 ' • 5.2 . . . .. .....3 0 - 5.2 • • • . 5 • 5 t , r - • • • • 4.6 - ......•-... . . . . - • e •• H • 4.2 . . . . . . .. . . . . . . . . . . . . . . _ . . - . - • - • • . • I 3.8 ' - 3.83.6 • •• . 1 -• • ;- • 3.2 sa 4.1 Ct A Si V) 2.8 . . . . - • .J. . +• - • - . . . 2.8 y • . • • 2.6 '._ • '. 2.6 • • 2.4 ; i ; ;- 2.4 2.2 2 • • . • 1.8 ; J FJ1H1.8 :• • r •1.2 • • • • • . • • • 0.6 . . • - • 0.6 I • 1 • 0.4 ' 0.4 0.2 . . . . •• . - . . • 0.2 • • . , 10,000 15,000 20,000 25.000 30.00• 35,000 40,000 45,000 50,000 55,000 Storage Area (If) — Storage Area — Storage Volume ! , Milton Substation - Proposed Conditions - 10 Year 1 Hour Storage Node : Pond (continued) Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in) (in) (in) (ft) 1 BleedDown Side Rectangular No 4.00 1.00 4804.00 0.63 2 OverflowGrate Bottom Rectangular No 24.00 24.00 4805.40 0.63 Output Summary Results Peak Inflow (cfs) 6.45 Peak Lateral Inflow (cfs) 0.00 Peak Outflow (cfs) 0.56 Peak Exflltration Flow Rate (cfm) 0.00 Max HGL Elevation Attained (ft) 4805.46 Max HGL Depth Attained (ft) 1.46 Average HGL Elevation Attained (ft) 4804.57 Average HGL Depth Attained (ft) 0.57 Time of Max HGL Occurrence (days hh:mm) 0 02:33 Total Exfiltration Volume (1000-ft3) 0.000 Total Flooded Volume (ac-in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0.00 Milton Substation - Proposed Conditions - 100 Year 1 Hour Project Description Fite Name Milton Proposed - With Pipes.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method EPA SWMM EPA SWMM Infiltration Method SCS Curve Number Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On Mar 16, 2015 00:00:00 End Analysis On Mar 19, 2015 00.00.00 n' Start Reporting On Mar 16, 2015 00 00 00 Antecedent Dry Days 0 days Runoff (Dry Weather) Time Step 0 01:00:00 days hh:mm:ss Runoff (Wet Weather) Time Step 0 00:05:00 days hh:mm:ss Reporting Time Step 0 00:05:00 days hh:mm:ss Routing Time Step 30 seconds Number of Elements Qty Rain Gages 1 Subbasins 5 Nodes 10 Junctions 7 Duffells 2 Flow Diversions 0 Inlets 0 Storage Nodes 1 Links 9 Channels 2 Pipes 5 Pumps 0 Orifices . 2 Weirs 0 Outlets . 0 Pollutants 0 I and Uses 0 Rainfall Details SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall ID Source ID Type Units Period Depth Distribution (years) (inches) t Rain Gage-01 Time Series 100YR-1HR Cumulative inches Colorado Weld 100 2.70 Florida DOT 1-hr Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin Summary SN Subbasin Area Impervious Weighted Average Equivalent Impervious Pervious Total Total Total Total Peak Time of ID Area Curve Slope Width Area Area Rainfall Infiltration Runoff Runoff Runoff Concentration Number Manning's Manning's Volume Roughness Roughness (ac) (%) (%) (ft) (in) (in) (in) (ac-in) (cfs) (days hh:mm:ss) 1 Northern 8.11 2.00 68.60 2.5000 729.00 0.0150 0.1500 2.70 1.9130 0.74 5.99 7.93 0 00:24:42 2 Off-Site 17.07 2.00 68.00 2.7500 1487.00 0.0150 0.1500 2.70 1.9310 0.72 12.32 16.41 0 00:24:27 3 SouthernArea 12.98 2.00 68.00 2.7500 895.00 0.0150 0.1500 2.70 2.0180 1.49 19.34 15.78 0 00:28:08 4 SubstatlonNorth 3.37 0.00 76.00 1.0000 735.00 0.0100 0.0240 2.70 1.4880 1.17 3.93 9.91 0 00:06:26 5 SubstationSouth 3.84 0.00 76.00 0.5000 500.00 0.0100 0.0240 2.70 1.5140 1.14 4.37 9.67 0 00:10:48 Milton Substation - Proposed Conditions - 100 Year 1 Hour Node Summary SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time ID Type Elevation (Max) Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded Elevation Elevation Attained Depth Attained Flooding Volume Attained Occurrence (ft) (ft) (It) (It) (IN) (cis) (It) (It) (It) (days hh mm) (ac-in) (min) 1 NorthPipeOut Junction 4814.46 4820.46 4814.46 4820.46 0.00 9.83 4815.61 0.00 4.85 0 00:00 0.00 0.00 2 Pondlniet Junction 4804.00 4810.00 4804.00 0.00 0.00 29.83 4804.49 0.00 5.51 0 00:00 0.00 0.00 3 PondOut Junction 4801.00 4801 .50 0.00 0.00 0.00 19.58 4802.40 0.00 0.60 0 00:00 0,00 0,00 4 SouthPipeOut Junction 4812.20 4818.20 4812.20 4818.20 0.00 9.63 4812.87 0.00 5.33 0 00:00 0.00 0.00 5 Structure - (79) Junction 4815.05 4818.24 4815.70 4818.24 0.00 9.85 4816.20 0.00 2.04 0 00:00 0.00 0.00 6 Structure - (81) Junction 4815.91 4818.10 4815.91 4818.10 0.00 9.67 4816.58 0.00 1.52 0 00:00 0.00 0.00 ' 7 Structure - (84) Junction 4816.34 4818.05 4816.34 4818.05 0.00 9.91 4817.50 0.00 0.56 0 00:00 0,00 0.00 8 NE Out Outfall 4812.00 7.93 4812.00 9 SouthernOut Outfall 4800.00 19.58 4801.40 10 Pond Storage Node 4804.00 4810.00 4804.00 0.00 29.83 4806.33 0.00 0.00 r MiHon Substation-Proposed Conditions- 100 Year 1 Hour Link Summary SN Element Element From To(Outlet) Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow/ Peak Flow Peak Flow Peak Flow Total Time Reported ID Type (Inlet) Node Invert Invert Slope Height Roughness Flow Capacity Design Flow Velocity Depth Depth/ Surcharged Condition Node Elevation Elevation Ratio Total Depth Ratio (ft) (ft) (ft) (%) (in) (cfs) (cts) (ft/sec) (ft) (min) 1 Link-01 Pipe Pondlnlet Pond 101.65 4804.00 4804.00 0.0000 0.000 0.0150 29.83 0.00 0.00 0.00 0.00 0.00 0.00 2 OulletPipe Pipe PondOut SouthemOut 70,00 4801.00 4800.00 1.4300 24.000 0.0150 19.58 23.43 0,84 8.35 1.40 0.70 0.00 Calculated 3 Pipe-(82) Pipe Structure-(84) Structure- (79) 128.21 4816.34 4815.05 1.0100 18.000 O.0130 9.85 10.55 0.93 6.82 1.11 0.77 0.00 Calculated 4 Pipe-(86) Pipe Structure-(79) NorthPipeOut 58.87 4815.05 4814.46 1.0000 18.000 0.0130 9.83 10.51 0.94 6.77 1.11 0.77 0.00 Calculated 5 Pipe-(89) Pipe Structure-(81) SoulhPipeOut 74.58 4815.91 4812.20 4.9700 18.000 0.0130 9.63 23.42 0.41 12.61 0.65 0.45 0.00 Calculated 6 NorlhemChannel Channel NorlhPipeOut Pondlnlet 220.00 4814.46 4804.00 4.7500 6.000 0.0390 9.81 12.83 0.76 3.98 0.42 0.87 0.00 7 SouthemChannel Channel SouthPipeOut Pondlnlet 300.00 4812.20 4804.00 2.7300 6.000 0.0390 9.53 9.73 0.98 3.24 0.48 0.99 0.00 8 BleedDown Orifice Pond PondOut 4804.00 4801.00 4.000 0.21 9 OverflowGrale Orifice Pond PondOut 4804.00 4801.00 24.000 19.37 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin Hydrology Subbasin : Northern Input Data Area (ac) 8.11 Impervious Area (%) 2.00 Weighted Curve Number 68.60 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.5000 Equivalent Width (ft) 729,00 Impervious Area Manning's Roughness 0.0150 Pervious Area Manning's Roughness 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Sal/Surface Description (acres) Group Number 8.37 - 68,60 Composite Area & Weighted CN 8.37 68.60 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.9130 Total Runoff (in) 0.74 Peak Runoff (cfs) 7.93 Weighted Curve Number 68.60 Time of Concentration (days hh:mm:ss) 0 00:24:42 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : Northern Rainfall Intensity Graph 6 58 I 56 54 52 5 48 4.6 44 42 4 38 36 L 34 32 — 3 E 2.8 2.6 24 2.2 2 18 16 14 12 1 08 06 04 02 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 85 e 75 7 65 6 55 5 4.5 c 4 35 3 25 2 15 1 05 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : Off-Site Input Data Area (ac) 17.07 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 1487.00 Impervious Area Manning's Roughness . 0.0150 Pervious Area Manning's Roughness ........_. . .. ...... 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve SoiWSurface Description (acres) Group Number 17.07 - 68.00 Composite Area & Weighted CN 17.07 68.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.9310 Total Runoff(in) 0.72 Peak Runoff (cfs) 16.41 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:24:27 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : Off-Site Rainfall Intensity Graph 62 6 58 ' 56 54 52 5 48 46 44 42 4 38 3.6 L 34 C 32 w 3 2.8 Ili 2.6 2.4 22 2 18 1 .6 14 12 1 08 0.6 0.4 02 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Fydrograph 18 17 16 15 14 13 12 11 2 10 U t 9 0 c D 8 7 6 5 4 3 2 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SouthernArea Input Data Area (ac) 12.98 Impervious Area (%) 2.00 Weighted Curve Number 68.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (%) 2.7500 Equivalent Width (ft) 895.00 Impervious Area Manning's Roughness ... .... . .... 0.0150 Pervious Area Manning's Roughness .. .. . . ........ . .. 0.1500 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 12.98 - 68.00 Composite Area & Weighted CN 12.98 68.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.96 Total Evaporation (in) 0.0000 Total Infiltration (in) 2.0180 Total Runoff (in) 1.49 Peak Runoff (cfs) 15.78 Weighted Curve Number 68.00 Time of Concentration (days hh:mm:ss) 0 00:28:08 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SouthernArea Rainfall Intensity Graph 62 6 58 p 56 54 52 5 48 46 4.4 42 4 3.8 • 3.6 • 34 3.2 �v 3 •E 2.8 2.6 2.4 2.2 2 18 16 14 12 1 08 06 04 02 1 0 5 10 15 20 25 30 35 40 45 50 55 6[1 65 70 Time (hrs) Runoff Hydrograph 17 16 15 14 13 12 11 10 6 9 c 8 7 6 5 4 3 2 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubstationNorth Input Data Area (ac) 3.37 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope r/o) 1.0000 Equivalent Width (ft) 735.00 Impervious Area Manning's Roughness 0.0100 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) D.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve Soil/Surface Description (acres) Group Number 3.37 - 76.00 Composite Area & Weighted CN 3.37 76.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (in) 1.4880 Total Runoff (in) 1.17 Peak Runoff (cfs) 9.91 Weighted Curve Number . . ._ 76.00 Time of Concentration (days hh:mm:ss) 0 00:06:26 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubstationNorth Rainfall Intensity Graph 62 6 5.8 56 54 52 5 48 46 4.4 42 4 38 t 36 34 32 3 28 cc 2 6 24 2.2 2 18 16 14 1 .2 1 08 06 0.4 02 . 1 Q 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 105 10 9.5 9 85 8 75 7 65 6 I 5.5 t c 5 4.5 4 35 3 25 2 15 1 0.5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubstatlonSouth Input Data Area (ac) 3.84 Impervious Area (%) 0.00 Weighted Curve Number 76.00 Conductivity (in/hr) 0.1500 Drying Time (days) 7.00 Average Slope (°/0) 0.5000 Equivalent Width (ft) 500.00 Impervious Area Manning's Roughness 0.0100 Pervious Area Manning's Roughness 0.0240 Curb & Gutter Length (ft) 0.00 Rain Gage ID Rain Gage-01 Composite Curve Number Area Soil Curve SoWSurlece Description (acres) Group Number 3.84 - 76.00 Composite Area & Weighted CN 3.84 76.00 Subbasin Runoff Results Total Rainfall (in) 2.70 Total Runon (in) 0.00 Total Evaporation (in) 0.0000 Total Infiltration (In) 1.5140 Total Runoff (in) 1.14 Peak Runoff (cfs) 9.67 Weighted Curve Number 76.00 Time of Concentration (days hh:mm:ss) 0 00:10:48 Milton Substation - Proposed Conditions - 100 Year 1 Hour Subbasin : SubstationSouth Rainfall Intensity Graph 62 6 58 I 56 54 52 5 4.8 46 44 42 4 38 36 L 34 32 a 3 28 lY 2 6 24 22 2 18 16 14 12 1 08 06 04 02 . k 0 5 10 16 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Runoff Hydrograph 10 95 9 85 8 75 7 65 6 2 5.5 0 5 45 4 35 3 25 2 15 1 0.5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hrs) Milton Substation - Proposed Conditions - 100 Year 1 Hour Junction Input SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum ID Elevation (Max) (Max) Water Water Elevation Depth Area Pipe Elevation Offset Elevation Depth Cover (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft2) (In) 1 NorthPipeOut 4814.46 4820.46 6.00 4814.46 0.00 4820.46 0.00 0.00 0.00 2 Pondlnlet 4804.00 4810.00 6.00 4804.00 0.00 0.00 -4810.00 0.00 0.00 3 PondOut 4801.00 4801.50 0.50 0.00 -4801.00 0.00 -4801.50 0.00 0.00 4 SouthPlpeOut 4812.20 4818.20 6.00 4812.20 0.00 4818.20 0.00 0.00 0.00 5 Structure - (79) 4815.05 4818.24 3.19 4815.70 0.65 4818.24 0.00 0.00 0.00 6 Structure - (81) 4815.91 4818.10 2.19 4815.91 0.00 4818.10 0.00 0.00 0.00 7 Structure - (84) 4816.34 4816.05 1.71 4816.34 0.00 4818.05 0.00 0.00 0.00 u Milton Substation - Proposed Conditions - 100 Year 1 Hour Junction Results SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume Attained Occurrence (cfs) (cfs) (1t) (It) (ft) (It) (It) (It) (days hh:mm) (days hh:mm) (ac-in) (min) 1 NorthPlpeOut 9.83 0.00 4815.61 1.15 0.00 4.85 4814.47 0.01 0 00:42 0 00:00 0.00 0.00 2 Pondinlet 29.83 15.78 4804.49 0.49 0.00 5.51 4804.00 0.00 0 00:43 0 00:00 0.00 0.00 3 PondOut 19.58 0.00 4802.40 1.40 0.00 0.60 4801.10 0.10 0 01:03 0 00:00 0.00 0.00 4 SouthPipeOut 9.63 0.00 4812.87 0.67 0.00 5.33 4812.21 0.01 0 00:42 0 00:00 0.00 0.00 5 Structure - (79) 9.85 0.00 4816.20 1 .15 0.00 2.04 4815.06 0.01 0 00:42 0 00:00 0.00 0.00 6 Structure - (81) 9.67 9.67 4816.58 0.67 0.00 1.52 4815.91 0.00 0 00:42 0 00:00 0.00 0.00 7 Structure - (84) 9.91 9.91 4817.50 1.16 0.00 0.56 4816.35 0.01 0 00:42 0 00:00 0.00 0.00 Milton Substation - Proposed Conditions - 100 Year 1 Hour Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape Height Width Manning's Entrance Exit/Bend Additional Initial Flap ID Invert Invert Invert Invert Drop Slope Roughness Losses Losses Losses Flow Gate Elevation Offset Elevation Offset (It) (ft) (ft) (ft) (It) (ft) (%) (ft) (ft) (cfs) 1 NorthernChannel 220.00 4814.46 0.00 4804.00 0.00 10.46 4.7500 Trapezoidal 0.500 8.000 0.0390 0.5000 0.5000 0.0000 0.00 No 2 SouthernChannel 300.00 4812.20 0.00 4804.00 0.00 8.20 2.7300 Trapezoidal 0.500 8.000 0.0390 0.5000 0.5000 0.0000 0.00 No I w Milton Substation - Proposed Conditions - 100 Year 1 Hour Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 NorthernChannel 9.81 0 00:43 12.83 0.76 3.98 0.92 0.42 0.87 0.00 2 SouthernChannel 9.53 0 00:43 9.73 0.98 3.24 1.54 0.48 0.99 0.00 Milton Substation - Proposed Conditions - 100 Year 1 Hour Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial Flap No. of ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow Gate Barrels Elevation Offset Elevation Offset Height (ft) (ft) (ft) (f1) (It) (ft) (%) (in) on) (cfs) 1 Link-01 101.65 4804.00 0.00 4804.00 0.00 0.00 0.0000 Dummy 0.000 0.000 0.0150 0.5000 0.5000 0.0000 0.00 No 1 2 OutletPipe 70.00 4801.00 0.00 4800.00 0.00 1.00 1.4300 CIRCULAR 24.000 24.000 0.0150 0.5000 0.5000 0.0000 0.00 No 1 3 Pipe - (82) 128.21 4816.34 0.00 4815.05 0.00 1.29 1.0100 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 4 Pipe - (86) 58.87 4815.05 0.00 4814.46 0.00 0.59 1.0000 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No 1 5 Pipe - (89) 74,58 4815.91 0.00 4812.20 0.00 3.71 4.9700 CIRCULAR 18.000 18.000 0.0130 0.5000 0.5000 0.0000 0.00 No t I Milton Substation - Proposed Conditions - 100 Year 1 Hour Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged Number Condition Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 Link-01 29.83 0 00:44 0.00 0.00 0.00 0.00 0.00 0.00 2 OutletPipe 19.58 0 01:03 23.43 0.84 8.35 0.14 1.40 0.70 0.00 Calculated 3 Pipe - (82) 9.85 0 00:42 10.55 0.93 6.82 0.31 1.11 0.77 0.00 Calculated 4 Pipe - (86) 9.83 0 00:42 10.51 0.94 6.77 0.14 111 0.77 0.00 Calculated 5 Pipe - (89) 9.63 0 00:42 23.42 0.41 12.61 0.10 0.65 0.45 0.00 Calculated Milton Substation - Proposed Conditions - 100 Year 1 Hour Storage Nodes Storage Node : Pond Input Data Invert Elevation (ft) 4804.00 Max (Rim) Elevation (ft) 4810.00 Max (Rim) Offset (ft) 6.00 Initial Water Elevation (ft) 4804.00 Initial Water Depth (ft) 0.00 ' Ponded Area (ft2) 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : Ex. Pond Stage Storage Storage Area Volume (ft) (ft') (ft') 0 6052 0.000 1 11800 8926.00 2 18310 23981 00 3 25920 46096.00 4 34350 76231.00 5 43834 115323.00 6 56520 165500.00 Milton Substation - Proposed Conditions - 100 Year 1 Hour Storage Area Volume Curves storage Volume (ft) 0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 6 • i 8 5.8 r ; 5.8 • 5.6 .. 4 5.6 • 5.2 } - - • 5.2 . r 5 • • - • - - - - - r t -• r - - r- - 5 • • 4.8 -94.8 • • 1 • • 4.6 -. -. . I -,-- - - 4.6 • . • . • 4.4 J . . . .1 - . l .1-- - ' 4.4 • • 1 • • 4.2 • T 4- • • - ' 1• 4.2 . • . • • 4 4 . . 1 • . • . • • 1 1 . • • 3.8 - .. 4. .. . 4. A. • 3.8 3.6 J • .. .. .. . . . . . . .. . 3.6 • . 1 • • I I I 3.4 . . . . - . . . . . . . • i - ; r ••• • 3.4 • . . 3.2 - - -- --- - + • 4- • - 3.2 Ws a1 • 4? en 3 • • ; (Q I I b V! 2.8 - .• 2.$ t/) • 2.4 . f i � • i r -• •-• . 4• • - 2.4 • • ; ; • 2 • - - • a. . . . - • • 1.8 ; . J• •• r l • ' 1.8 1.6 i --- i r at - 4• • 1.6 II 4 1.2 • - V- -- 1.2 J I J 1 I 0.8 - - - - - --. }- - -. . 0.8 0.6 -- . . . - .- • - - 0.6 . . 0.4 -- • - 0.4 • 1 • 1 0.2 - - - - 0.2 0 t i 0 10,000 15,000 20,000 25,000 30.000 35,000 40.000 45.000 50.000 55.N0 Storage Area (ftl — Storage Area — Storage Volume Milton Substation - Proposed Conditions- 100 Year 1 Hour Storage Node : Pond (continued) Outflow Orifices SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient Diameter Height Width Elevation (in) (in) (in) (ft) 1 BleedDown Side Rectangular No 4.00 1.00 4804.00 0.63 2 OverflowGrate Bottom Rectangular No 24.00 24.00 4805.40 0.63 Output Summary Results ' Peak Inflow (cfs) 29.83 Peak Lateral Inflow (cfs) 0.00 Peak Outflow (cfs) 19.58 Peak Exfiitration Flow Rate (cfm) 0.00 Max HGL Elevation Attained (ft) 4806.33 ., Max HGL Depth Attained (ft) 2.33 Average HGL Elevation Attained (ft) 4804.62 Average HGL Depth Attained (ft) 0.62 Time of Max HGL Occurrence (days hh:mm) 0 01:03 Total Exfiltration Volume (1000-ft') 0.000 Total Flooded Volume (ac-in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0.00 Sec. 5-4-40 — Definition of terms. Competitive process: The term competitive process means any process described in this chapter that assures open and competitive bidding. This may include an invitation for bid, qualification based selection process or request for qualification, request for proposal, request for information and the related procedures. Sec. 5-4- Request for Information Procedure: A. Applicability: A Request for Information may be used for formal or informal purchases. B. Similar to a request for qualifications, and typically made during the project planning phase, the request for information (RFI ) shall be advertised by the Department of Purchasing. Its purpose is to collect written information regarding a supplier of services capabilities. If possible, the department needing the services shall identify requirements or expectations of the services that will be requested. It may request specific answers for how the vendor will meet the expectations of the project. The RFI will be used to create a list of vendors that could meet the various needs of the department, but an award of contract will not automatically follow. tit 41;3})irk 44 ' 4 fit kia de di pit li• FINAL DRAINAGE REPORT FOR THE RATTLESNAKE RIDGE ELECTRICAL SUB -STATION Prepared for: United Power, Inc . 500 Cooperative Way Brighton , CO 80603 Prepared by : Colorado Civil Group , Inc . 1413 West 29t" Street Loveland , CO 80538 JUNE 26 , 2015 COLORADO CIVIL GROUP, INC. . - COLORADO CIVIL GROUP, INC. F0¢wt0*4 Consultants June 26, 2015 Weld County Engineering Department 1111 H Street Greeley, CO 80632 Re: Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report To Whom it May Concern, We are pleased to submit this Final Drainage Report for the Rattlesnake Ridge Electrical Sub- Station project, This project is part of a larger transmission line project with Tri-State Generation and Transmission Association Inc. and United Power, Inc. This final drainage report has been prepared specifically for the proposed 10-acre Rattlesnake Ridge Electrical Sub- Station. This report was prepared based on current Weld County Storm Drainage Criteria. Please let me know if you have any questions or comments Sincerely, COLORADO CIVIL GROUP, INC. David A. Huwa, P. E. ENGINEER'S CERTIFICATION I hereby certify that this report for the final drainage design of the Rattlesnake Ridge Electncal Sub-Station was prepared by me (or under my direct supervision) in accordance with the provisions of the Weld County Storm Drainage Criteria for the applican _ j_ . , • • - rty thereof asp • kst `O 4A%- David A Hu >- Licensed Professional Engineer State of Colorado No. 40727 COLORADO CIVIL GROUP. INC . • 1413 W. 29" Street • Loveland. Colorado 80538 • 970.278-0029 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Table of Contents Introduction 1 1 General Location and Description 1 1.1 Location 1 1.2 Description of Property 2 2 Drainage Basins and Sub-Basins 3 2.1 Major Basin Description 3 2.2 Sub-Basin Description 3 3 Drainage Design Criteria 3 3.1 Regulations 3 3.2 Development Criteria Reference and Constraints 3 3.3 Hydrological Criteria 4 3.4 Hydraulic Criteria 4 4 Drainage Facility Design 4 4.1 General Concept 4 4.2 Specific Details 4 5 Conclusions 9 6 References 9 Appendix A: Existing Soil Properties .A Appendix B: Hydrologic Calculations B Appendix C: Swale Analysis C Appendix D: Detention Pond & Outlet Analysis D i Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Introduction The objective of this report is to present the proposed drainage design for the proposed Rattlesnake Ridge electrical sub-station . This report presents the undeveloped and developed condition hydrology and how surface runoff is collected and conveyed by means of surface facilities to a detention pond . This report was prepared in accordance with the Weld County Storm Drainage Criteria and also makes reference to the Urban Drainage and Flood Control District's ( UDFCD) Storm Drainage Criteria Manual . 1 General Location and Description 1.1 Location The project is located within the east half of Section 25, Range 65 West, Township 3 North , Weld County Colorado. More specifically, the site is located about one-half mile south of WCR 30 , and one-quarter mile west of WCR 49. A vicinity map showing the project site and location is provided below. Y7 ti MILTON RES. ,, 4_ ' C ,..J[ it E.. WCR 49 .g • - y �- ti _ 41 777 BOX ELDER ill ., _ _ = CREEK - 1 , 1;\ • ft * j. I I I ..aallift , . mi _ _ i c. _ i . WCR 30 _ - --``' ::: -46:4. ' : " WCR 30 F. 1 7.1, .� i1 - � ..41 fat . 30-ACRE SITE a � _ ... • c Y . l r - A l - W4 a AII t i 1 IP 1 - i, a A .... A • .i• . -A I i ' / • Q. i >. WCR 49 1 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 1.2 Description of Property The 30 acre property contains both irrigated and non-irrigated agricultural crops. In general the property slopes down from west to east with slopes ranging from 0.5% to 7% . Within the 30 acre property, a 10 acre electrical substation pad is and access road is being proposed . There are a few existing field access roads consisting of gravel surfacing , one well head , and multiple gas and electrical buried utilities. A majority of the property drains from west to east, but there is a portion located north of a ridge, that drains off-site to the north . Approximately 20% of the soils found on- site are classified Type C soil , with about 80% classified as Type A soil , based on the Natural Resources Conservation Service. The southeast corner of the 30 acre property is located within a FEMA 100 year floodplain for Box Elder Creek, the associated FEMA map is 0802660900C . The soils information, erosion potential and FEMA Firmette are found in Appendix A. A higher quality photo of the property is provided below for reference. 1 WCR 30 i- • z. . .t 1 II • I 30 Acre Site j Le - ,a e a 10 Acre Pad WCR49 Box Elder Creek - - — — ..- . --gam -- - . 2 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 2 Drainage Basins and Sub-Basins 2.1 Major Basin Description The property is not located within a master planned drainage basin , but is located within the 100-year FEMA floodplain for Box Elder Creek. Box Elder Creek is located east of the property, and all runoff from the property is conveyed east to Box Elder Creek. 2.2 Sub-Basin Description The existing drainage patterns observed on-site show surface runoff generally flowing from west to east. There is a large area along the eastern edge of the property with very mild slopes around 0 .5% . It is assumed that runoff from the west enters the large flat area and runoff infiltrates and ultimately continues to sheet flow to the east toward Weld County Road 49 and Box Elder Creek. There is a ridge that splits a smaller portion of the flow to the north , but ultimately flows continue east toward CR 49 and Box Elder Creek. It is estimated that 30. 1 acres to the west are tributary to the proposed improvements. 3 Drainage Design Criteria 3.1 Regulations Based on the proposed development's size, approximately 11 acres of improvements, the Rational Method outlined by Weld County and Urban Drainage was utilized for all undeveloped and developed hydrologic and hydraulic calculations. 3.2 Development Criteria Reference and Constraints As previously mentioned , the undeveloped and developed site has been analyzed following Weld County and Urban Drainage development criteria . The 2-year and 100- year rainfall events were used to determine basin discharge rates. Weld County requires stormwater detention , so the improvements will include a detention pond sized to detain 100-year developed runoff while releasing at the 10-year historic rate. The proposed detention pond has been located completely outside of the Box Elder Creek 100-year floodplain . The detention pond has also been located completely outside of the existing gas easement at the direction of the easement holder, which runs north- south along the eastern end of the 30 acre property. 3 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 3.3 Hydrological Criteria Drainage design and computations are based on Weld County and Urban Drainage & Flood Control District's Drainage Criteria Manuals. The Minor design storm for this development is based on the 2-year event, while the major design storm is based on the 100-year event. The required detention volume for the proposed improvements was determined based on the composite allowable unit release rate for 80% Type A soils and 20% Type C soils. The 10-year composite allowable unit release rate for the development is 0. 16 cfs/acre. Based on the proposed improvements, the composite allowable release rate is 1 .76 cfs. There are several different methods that can be used to model or predict the amount of surface runoff generated from precipitation events ranging from a 2-year to a 100-year storm event, but the Rational Formula Method was used for the proposed improvements. 3.4 Hydraulic Criteria Hydraulic Criteria within Urban Drainage manuals was utilized in sizing proposed drainage swales, the proposed detention pond , and the outlet works of the detention pond . The Modified FAA method was utilized for sizing the detention pond . 4 Drainage Facility Design 4.1 General Concept The following sections describe the drainage analysis for the developed site and discuss the design and recommendations for facility size and installation that will mitigate the effects of increased surface runoff caused by increased impervious areas. Design and recommendations for facilities installed with this project include drainage swales, a detention pond , and the detention pond outlet works. 4.2 Specific Details In order to provide recommendations for proposed drainage facilities, off-site and on-site hydrologic calculations were performed . An exhibit provided below identifies the off-site (black dashed line) and on-site (red shaded) areas for the project. The hydrologic calculations are discussed in detail below. Additionally, drainage facility designs are discussed below. 4 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 / <7' 1/1 / / i1 / i *111 r II risi el.3/4.aft eir,/ .... Z.o. `�i.4 .� .• e•a II Sy) 7 411 soft as II / i . / < X4 ‘ I 1 ../2/ 1 Ill LL % i.r.o�t_ ��,—.. LL x, \\ (1 , LLL tAL , I ,I ill 1��I 11 i i :ii. , 4 , \ ., _ ii - - , , � . 4 M M 11 I 11� .,` , .% a 1 I_ / /777-- -/ --7 /4 1 ( N \ )._____ __ ____. _ - / r-i- - -I- 2 % 7771L .-- 1 r Undeveloped Hydrologic Analysis - An undeveloped hydrologic analysis was performed for both on-site and off-site contributing areas. The portions of the 30 acre property considered on-site are those receiving improvements (red shading above) that increase the imperviousness. These portions are limited to the 20 foot wide access road and sub-station pad which will be finished with structural fill and gravel/rock, increasing the imperviousness. There are additional areas within the 30 acre property where the grading will be altered , however, those areas will be re-seeded and returned to an undeveloped state. As a result, any area west of the pad not receiving improvements that increase the imperviousness are considered off-site for the purpose of this evaluation . An undeveloped hydrologic calculation was performed for the off-site contributing area of 30. 1 acres, which includes areas west of the proposed sub-station pad and access road and is intercepted by the proposed improvements. A portion of the 30 . 1 acres lies within the 30 acre property and a portion is located west of the 30 acre property. The calculated 100-year undeveloped discharge from the 30. 1 acre off-site area is 27.8 cfs. This is less than the common assumption of 1 cfs/acre, but seems reasonable since the off-site soils are classified as Type A soils with high infiltration rates. 5 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 An undeveloped hydrologic calculation was also performed for the on-site portion of the 30 acre property. The on-site areas include the proposed 20 foot wide access road and sub-station pad . The proposed 20 foot wide access road and the sub-station pad total approximately 11 acres. The 100-year undeveloped discharge within the proposed 20 foot wide access road is 1 .6 cfs. The 100-year undeveloped discharge within the proposed sub-station pad is 8 .5 cfs. The total 100-year undeveloped discharge rate from the 20 foot access road and sub-station pad areas is 10 . 1 cfs. This is also less than the common assumption of 1 cfs/acre, but again seems reasonable since the soils are classified as Type A soils. All undeveloped hydrologic calculations are found in Appendix B . Developed Hydrologic Analysis - A developed hydrologic analysis was performed for the on-site portions of the 30 acre property which includes the proposed 20 foot wide access road and sub-station pad , and totals 11 acres. The 20 foot wide access road sheet-flows to the north and into a proposed roadside swale. This runoff does not reach the proposed detention pond , so it is released off-site undetailed . The 100-year developed discharge from the 20 foot wide access road is 3. 1 cfs. The sub-station pad drains into the proposed detention pond , and the 100-year developed discharge is 16.2 cfs. All developed hydrologic calculations are found in Appendix B . Drainage Swale Analysis - There are several different drainage swale configurations proposed with the construction of the 20 foot wide access road and sub-station pad . Each drainage swale with a different configuration has been identified with a cross- section description , i .e. Swale A-A. The UD-Channel software made available by Urban Drainage was used to run normal flow capacity calculations for each drainage swale configuration . The drainage swales mainly intercept off-site runoff and route it safely through the site. The drainage swale capacity calculations are found in Appendix C . 6 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Detention Pond Analysis - One stormwater detention pond is proposed for the project, and is located at the southeast end of the 30 acre property as shown by the grey shading in the exhibit below. The detention pond has been designed to collect the 100-year developed discharge from the sub-station pad and release runoff at the 10- year historic rate of 1 .76 cfs. The required stormwater detention volume is 1 . 1 acre- feet based on the Modified FAA method . The outlet of the detention pond is at an elevation of 4797 .43 and the 100-year water surface elevation is 4798.83 based on the Modified FAA method . The top of pond elevation is 4799.20, which provides 0 .37 feet of freeboard . Although this is less than one foot of freeboard , which is typical for new detention ponds, it still increases the ponds storage capacity by 46% to 1 .61 acre-feet. The 20 foot wide access road does not physically drain into the proposed detention pond , however, the sizing calculations assume that is does drain to the detention pond . The un-detained runoff from the proposed 20 foot wide access road is relatively small and considered negligible. The stormwater detention pond calculations are found in Appendix D. Li / i / I NINI ME EM tl� :� tan f 1 ` : . /), / 11 I A / `_ I ,` it 77 i �: , •/ / III — s. , i fr — ' . . - 9 sittLhuii 28 H, 0 1/ .. � a� 11u �' I�IIIIIIIIIIIII�IIIIIII�IIIIIIIII�IIIIIIIIIt- • _ I .. 1 I, L \ f"7 ` In some cases water quality control structures are incorporated into the detention pond and outlet structure design. Based on the proposed improvements and project location , it is believed that a water quality control structure would likely be ineffective. This is 7 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 based on several specifics to the site. First, the soils on-site and off-site are classified as Type A soils with high infiltration rates. Second , although the imperviousness of the site will increase, it increases with the addition of gravel surfacing which still allows infiltration as opposed to a paved surfaces which can transport pollutant liquids. The improved areas are proposed to drain into vegetated swales and a vegetated storm water detention pond which will provide some water quality benefit. Due to existing topography, the bottom of the detention pond will have a slope of approximately 0 . 15% , which will encourage significant infiltration with the Type A soils. Since the improved areas will remain pervious to some degree and all runoff is conveyed to vegetated swales and the detention pond , water quality will be improved prior to leaving the detention pond . Additionally, since the proposed sub-station is located in a rural area with minimal traffic at the site to maintain the outlet works, it is assumed that the small perforations typical with water quality control structures would easily and quickly plug from dry vegetation and wind-blown sand . Considering these issues, a water quality control structure will not significantly improve water quality and would likely hinder the performance of the outlet works and detention pond . Outlet Works Analysis - There are several components associated with the proposed detention pond outlet works, and include an orifice, outlet structure, and emergency overflow weir. Each is discussed in detail below. Orifice - The proposed detention pond will include an outlet structure with an orifice designed to restrict the discharge to the 10-year allowable rate of 1 .76 cfs. Based on the Urban Drainage orifice equation SO-15, the proposed orifice within the outlet structure is required to be no larger than 8-inches in diameter. An 8-inch PVC or HDPE pipe could be used for this orifice and simply formed into the outlet structure. Outlet Structure - The outlet structure will include a weir intended to intercept developed runoff once the detention pond exceeds the 100-year water surface elevation . The top of the outlet structure will be set at the 100-year water surface elevation of 4798 .83. At this elevation , runoff intercepted by the structure is in a weir condition . The outlet structure size is proposed to be 12 feet long by 3 feet wide, 8 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 which provides 30 feet for a weir when measured along all four sides of the structure. The outlet structure weir capacity up to the top of the detention pond (4799 .20) is 22 .5 cfs, which is greater than the 100-year developed discharge rate from proposed improvements. Emergency Overflow Weir - The proposed detention pond includes an emergency overflow weir in the event the outlet structure becomes plugged . The weir is located at the east end of the detention pond and includes the entire 75 foot berm . The emergency overflow weir elevation is 4799.00, while the top of the detention pond is 4799.20. The intent of the emergency overflow weir is to ensure runoff does not backwater onto the proposed sub-station or spill to the south of the 30 acre property. All outlet works calculations are found in Appendix D . 5 Conclusions The final drainage design for the Rattlesnake Ridge safely and effectively collects and conveys runoff and attempts to mimic undeveloped drainage patterns. There are a few instances where the proposed design does not meet Weld County's current criteria , however, based on the development type and project location these instances are a reasonable deviation from the criteria . Storm water control will be implemented with the use of grading techniques, drainage swales, and detention . Erosion control devices are identified to minimize erosion at the source and prevent sediment laden runoff from exiting the project area . 6 References Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volume 1-3, June 2001 . Weld County Engineering and Construction Criteria. Weld County Public Works Department, April 2012 . 9 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Appendix A : Existing Soil Properties A 23:i I 24 , 'y �/, ��, h+�h�,r a €l c I • Ir `.�j-� l v��c f f' a> K ` I LL w s--,, ,i7 _,a J ayiCsl i �)_�_` Yf )'1 ¢rt � tx bw'' 4{AS n Stt § iD �Tryx +nE• i .y≥R- r ,r ♦r 2=fr y w ;^ ��p� +z '(i,x I APPROXIMATE SCALE ra^ i<''G '..i Ya I-• '�w > yqr , .n T ' S .� t 4'}�+ Alf<\Z<4/ fn ozz I•(yt a+ `�1b"'v ! yt 6 S Zl/<N 0 t = } a4}H` rM7_ n ,M,.r+..�'�?y.c ✓rSs`Y vw$} - c ,+y'. —{ ( ; yytt.ry °qmow-. yS�i-� 'jt .t'd E ♦ F" 1 `+kty 12Y. c `"r ,at" ..„....._ .........___I E—� "____� Z I �_..,_.— _..__,_- i f 4Gt'I xctl �.�y {ry"< hrl• `NM `�3 i{• • fxyy i +y''e`,< iWy { -. �..___,..,.. __� ,r_.._.�_�..- e E '+ i !^Ri{rfii.ez: ♦r a Y' < fir ? K' k . 1r�,.Ya acF r ,. 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Ai, x h ry�' 1 Y ' i'Y. .i 1. ;f13v t q• �` , x rr w� t ti>e This is an official copy of a portion of the above referenced flood map. It i t ; ��r� 't � t,�, > •<� >) r <5.,fr,t/ was extracted using F-MIT On-Line. This map does not reflect changes l '1. e ; "• G rp«`� ' or amendments which may have been made subsequent to the date on the y.. ,_ ce • �y,+{� • pp$',,,," title block. For the latest product information about National Flood Insurance a J I , .• . l.'v -,. . � , ' r „ F A Program flood maps check the FEMA Flood Map Store at www.msc.fema.gov 4 Drainage Class—Weld County, Colorado, Southern Part N - (Drainage Class) A ° ° 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 40° 11'52"N Q il z, ill •, _ - 1•j • , 40° 11'52"N w .. ' f 'r r E, 1 • III"' i^ 1 1 ; . * ' O 4 , 1. l O I . t tl , r i '.. •, * r. No CO ar. so. i o erpezranistk;?, . .4 joi g Sid _ a . OIri , 4 17 O rN tn O1 40° 11'41"N I 40° 11'41"N 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 AMap Scale: 1:2,370 if printed on A landscape (11" x 8.5") sheet. Meters ° $ N 0 35 70 140 210 $ AFeet 0 100 200 400 600 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 1 of 3 Drainage Class—Weld County, Colorado, Southern Part (Drainage Class) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Excessively drained The soil surveys that comprise your AOI were mapped at 1 :24,000. Area of Interest (AOI) 0 Somewhat excessively drained Soils Warning: Soil Map may not be valid at this scale. Soil Rating Polygons D Well drained Enlargement of maps beyond the scale of mapping can cause Excessively drained O Moderately well drained misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting Somewhat excessively i0 Somewhat poorly drained soils that could have been shown at a more detailed scale. drained Well drained 0 Poorly drained Please rely on the bar scale on each map sheet for map Moderately well drained Very poorly drained measurements. Somewhat poorly drained InSubaqueous Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov Poorly drained p Not rated or not available Coordinate System: Web Mercator (EPSG:3857) El Very poorly drained Water Features Maps from the Web Soil Survey are based on the Web Mercator Streams and Canals projection, which preserves direction and shape but distorts i Subaqueous distance and area. A projection that preserves area, such as the Transportation Not rated or not available Albers equal-area conic projection, should be used if more accurate 4-4-4 Rails calculations of distance or area are required. Soil Rating Lines ti Interstate Highways ry Excessively drained This product is generated from the USDA-NRCS certified data as of US Routes the version date(s) listed below. • • Somewhat excessively drained Major Roads Soil Survey Area: Weld County, Colorado, Southern Part • • Well drained Local Roads Survey Area Data: Version 13, Sep 23, 2014 • • Moderately well drained Background Soil map units are labeled (as space allows) for map scales 1 :50,000 or larger. • • Somewhat poorly drained Aerial Photography Date(s) aerial images were photographed: Apr 22, 2011—Apr 13, • ♦ Poorly drained 2012 ,•4.45, Very poorly drained The orthophoto or other base map on which the soil lines were . Subaqueous compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting • • Not rated or not available of map unit boundaries may be evident. Soil Rating Points USDA Natural Resources Web Soil Survey 2/26/2015 Conservation Service National Cooperative Soil Survey Page 2 of 3 Drainage Class—Weld County, Colorado, Southern Part Drainage Class Drainage Class Drainage Class— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 19 Colombo clay loam, 0 to Well drained 5.3 18.8% 1 percent slopes 69 Valent sand, 0 to 3 Excessively drained 6. 1 21 .7% percent slopes 72 Vona loamy sand, 0 to 3 Well drained 3.7 13.2% I percent slopes 73 Vona loamy sand, 3 to 5 Well drained 13.1 46.3% percent slopes Totals for Area of Interest 28.3 100.0% Description "Drainage class (natural)" refers to the frequency and duration of wet periods under conditions similar to those under which the soil formed. Alterations of the water regime by human activities, either through drainage or irrigation , are not a consideration unless they have significantly changed the morphology of the soil. Seven classes of natural soil drainage are recognized-excessively drained, somewhat excessively drained, well drained, moderately well drained , somewhat poorly drained, poorly drained, and very poorly drained . These classes are defined in the "Soil Survey Manual." Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Hydrologic Soil Group—Weld County, Colorado, Southern Part N - (Hydrologic Soil Group) ° ° 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 40° 11'52"N Q - 7Y . , 'V i • , ..E 40° 11'52"N • �J 1 . 4 :60MAl+ / j L` E '1 ell r. Li SD - 1 • Ir Ei 1r� ` a4 ( tt Yk'1d'''!. �j(� cu® -- 3 ry u) - t , i ! . . O jilli llin.40° 11'41"N I I I I I 40° 11'41"N 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 AMap Scale: 1:2,370 if printed on A landscape (11" x 8.5") sheet. A Meters ° $ N 0 35 70 140 210 $ AFeet 0 100 200 400 600 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 1 of 4 Hydrologic Soil Group—Weld County, Colorado, Southern Part (Hydrologic Soil Group) MAP LEGEND MAP INFORMATION Area of Interest (AOI) p C The soil surveys that comprise your AOI were mapped at 1 :24,000. Area of Interest (AOI) ® C/D Warning: Soil Map may not be valid at this scale. Soils D Soil Rating Polygons Enlargement of maps beyond the scale of mapping can cause A p Not rated or not available misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting ND Water Features soils that could have been shown at a more detailed scale. Streams and Canals ■ B Transportation Please rely on the bar scale on each map sheet for map B/D measurements. 4-4-f Rails C ti Interstate Highways Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov C/D US Routes Coordinate System: Web Mercator (EPSG:3857) ■ D Major Roads Maps from the Web Soil Survey are based on the Web Mercator Not rated or not available projection, which preserves direction and shape but distorts Local Roads distance and area. A projection that preserves area, such as the Soil Rating Lines Background Albers equal-area conic projection, should be used if more accurate '` 01 A . Aerial Photography calculations of distance or area are required. ND This product is generated from the USDA-NRCS certified data as of B the version date(s) listed below. ti B/D Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 13, Sep 23, 2014 C Soil map units are labeled (as space allows) for map scales 1 :50,000 ,.� C/D or larger. 0%40 D Date(s) aerial images were photographed: Apr 22, 2011—Apr 13, • r Not rated or not available 2012 Soil Rating Points The orthophoto or other base map on which the soil lines were O A compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting ■ ND of map unit boundaries may be evident. ■ B ■ B/D USDA Natural Resources Web Soil Survey 2/26/2015 Conservation Service National Cooperative Soil Survey Page 2 of 4 Hydrologic Soil Group—Weld County, Colorado, Southern Part Hydrologic Soil Group Hydrologic Soil Group Hydrologic Soil Group— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 19 Colombo clay loam, 0 to C 5.3 18.8% 1 percent slopes 69 Valent sand, 0 to 3 A 6. 1 21 .7% percent slopes 72 Vona loamy sand, 0 to 3 A 3.7 13.2% I percent slopes 73 Vona loamy sand, 3 to 5 A 13.1 46.3% percent slopes Totals for Area of Interest 28.3 100.0% Description Hydrologic soil groups are based on estimates of runoff potential . Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission . Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential , soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material . These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 3 of 4 Hydrologic Soil Group—Weld County, Colorado, Southern Part Hydrologic Soil Group Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie-break Rule: Higher USDA Natural Resources Web Soil Survey 2/26/2015 all Conservation Service National Cooperative Soil Survey Page 4 of 4 Wind Erodibility Group—Weld County, Colorado, Southern Part N i (Wind Erodibility Group) ° ° 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 40° 11'52"N Q z, 40° 11'52"N No , # • • .l'•. .1" Y 4 f , -. 1• , + - .11 i' 0 3 a, . . - i t 4 , lf AI r ., Last No r.--. CO --� 7IFF r,, o/ ••s .1 O tril Ir : 17 x.- O 4 1 , sost-.., I. • g 40° 11'41"N I I i i I 40° 11'41"N 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 AMap Scale: 1:2,370 if printed on A landscape (11" x 8.5") sheet. Meters ° $ N 0 35 70 140 210 $ AFeet 0 100 200 400 600 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 1 of 3 Wind Erodibility Group—Weld County, Colorado, Southern Part (Wind Erodibility Group) MAP LEGEND MAP INFORMATION Area of Interest (AOI) 1 The soil surveys that comprise your AOI were mapped at 1 :24,000. Area of Interest (AOI) O 2 Warning: Soil Map may not be valid at this scale. SoilsCI 3 Soil Rating Polygons Enlargement of maps beyond the scale of mapping can cause - 1 p 4 misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting 2 0 4L soils that could have been shown at a more detailed scale. 3 O 5 Please rely on the bar scale on each map sheet for map 4 0 6 measurements. 4L ■ 7 Source of Map: Natural Resources Conservation Service 5 IIII 8 Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov Coordinate System: Web Mercator (EPSG:3857) 6 CI Not rated or not available Maps from the Web Soil Survey are based on the Web Mercator 7 Water Features projection, which preserves direction and shape but distorts Streams and Canals distance and area. A projection that preserves area, such as the ® 8 Albers equal-area conic projection, should be used if more accurate Transportation Not rated or not available calculations of distance or area are required. III Rails Soil Rating Lines •-••• Interstate Highways This product is generated from the USDA-NRCS certified data as of olio* 1 the version date(s) listed below. US Routes r ., 2 Soil Survey Area: Weld County, Colorado, Southern Part Major Roads Survey Area Data: Version 13, Sep 23, 2014 r • 3 Local Roads Soil map units are labeled (as space allows) for map scales 1 :50,000 " " 4 or larger. Background 4L Aerial Photography Date(s) aerial images were photographed: Apr 22, 2011-Apr 13, „ , 5 2012 6 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background .^%'' 7 imagery displayed on these maps. As a result, some minor shifting 8 of map unit boundaries may be evident. pawr r Not rated or not available Soil Rating Points USDA Natural Resources Web Soil Survey 2/26/2015 Conservation Service National Cooperative Soil Survey Page 2 of 3 Wind Erodibility Group—Weld County, Colorado, Southern Part Wind Erodibility Group Wind Erodibility Group Wind Erodibility Group— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618) Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 19 Colombo clay loam, 0 to 4L 5.3 18.8% 1 percent slopes 69 Valent sand, 0 to 3 1 6. 1 21 .7% percent slopes 72 Vona loamy sand, 0 to 3 2 3.7 13.2% I percent slopes 73 Vona loamy sand, 3 to 5 2 13.1 46.3% percent slopes Totals for Area of Interest 28.3 100.0% Description A wind erodibility group (WEG) consists of soils that have similar properties affecting their susceptibility to wind erosion in cultivated areas. The soils assigned to group 1 are the most susceptible to wind erosion, and those assigned to group 8 are the least susceptible. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie-break Rule: Lower USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Wind Erodibility Index—Weld County, Colorado, Southern Part N - (Wind Erodibility Index) ° ° 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 40° 11'52"N 1 • I I I I 40° 11'52"N ti- 1 rr ' i ii y. QV • day - . . O ti 1 AA; .. r 01 ' i- Li r Y: (r i 1 i • G Vii ' , ��i �; i In m . S ` . • ry -E •R 1111Lidirsaidarimonviwiessaiiiirrimimassissiallit No 40° 11'41"N I I I 40° 11'41"N 533000 533050 533100 533150 533200 533250 533300 533350 533400 533450 533500 AMap Scale: 1:2,370 if printed on A landscape (11" x 8.5") sheet. Meters ° $ N 0 35 70 140 210 $ AFeet 0 100 200 400 600 Map projection: Web Mercator Corner coordinates: WG584 Edge tics: UTM Zone 13N WGS84 USDA Natural Resources Web Soil Survey 2/26/2015 a Conservation Service National Cooperative Soil Survey Page 1 of 3 Wind Erodibility Index—Weld County, Colorado, Southern Part (Wind Erodibility Index) MAP LEGEND MAP INFORMATION Area of Interest (AOI) sow. 250 The soil surveys that comprise your AOI were mapped at 1 :24,000. Area of Interest (AOI) o.w, 310 Warning: Soil Map may not be valid at this scale. Soils • r Not rated or not available Soil Rating Polygons Enlargement of maps beyond the scale of mapping can cause IN 0 Soil Rating Points misunderstanding of the detail of mapping and accuracy of soil line IN 0 placement. The maps do not show the small areas of contrasting 38 soils that could have been shown at a more detailed scale. 9 38 48 CI 48 Please rely on the bar scale on each map sheet for map 56 measurements. O 56 86 Source of Map: Natural Resources Conservation Service 86 Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov 134 134 Coordinate System: Web Mercator (EPSG:3857) 160CI 160Survey Maps from the Web Soil are based on the Web Mercator 180 projection, which preserves direction and shape but distorts p 180 distance and area. A projection that preserves area, such as the 220 Albers equal-area conic projection, should be used if more accurate ® 220 El 250 calculations of distance or area are required. 250 ® 310 This product is generated from the USDA-NRCS certified data as of 310 the version date(s) listed below. Not rated or not available Not rated or not available Soil Survey Area: Weld County, Colorado, Southern Part Soil Rating Lines Survey Area Data: Version 13, Sep 23, 2014 Water Features 0 Streams and Canals Soil map units are labeled (as space allows) for map scales 1 :50,000 ,.o 38 or larger. Transportation 48 +-f-t Rails Date(s) aerial images were photographed: Apr 22, 2011-Apr 13, . • 56 2012 ti Interstate Highways • • 86 The orthophoto or other base map on which the soil lines were US Routes compiled and digitized probably differs from the background . • 134 Major Roads imagery displayed on these maps. As a result, some minor shifting . r 160 of map unit boundaries may be evident. Local Roads • • 180 Background 220 . Aerial Photography USDA Natural Resources Web Soil Survey 2/26/2015 Conservation Service National Cooperative Soil Survey Page 2 of 3 Wind Erodibility Index—Weld County, Colorado, Southern Part Wind Erodibility Index Wind Erodibility Index Wind Erodibility Index— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618) Map unit symbol Map unit name Rating (tons per acre Acres in AOI Percent of AOI per year) 19 Colombo clay loam, 0 to 86 5.3 18.8% 1 percent slopes 69 Valent sand, 0 to 3 220 6.1 21 .7% I percent slopes 72 Vona loamy sand, 0 to 3 134 3.7 13.2% percent slopes I 73 Vona loamy sand, 3 to 5 134 13.1 46.3% percent slopes Totals for Area of Interest 28.3 100.0% Description The wind erodibility index is a numerical value indicating the susceptibility of soil to wind erosion, or the tons per acre per year that can be expected to be lost to wind erosion . There is a close correlation between wind erosion and the texture of the surface layer, the size and durability of surface clods, rock fragments, organic matter, and a calcareous reaction. Soil moisture and frozen soil layers also influence wind erosion. Rating Options Units of Measure: tons per acre per year Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie-break Rule: Higher USDA Natural Resources Web Soil Survey 2/26/2015 Conservation Service National Cooperative Soil Survey Page 3 of 3 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Appendix B : Hydrologic Calculations B RATTLESNAKE RIDGE BASIN PARAMETERS Basin Categories and Areas (SF) Gravel Percent Imp. Soil Basin Area Basin I.D. Landscaped Areas Classification 26 401 (6 /100) (acres) OS1 1,311,048 0 2.0.6 A 30.10 EX1 35,877 0 2.01 A 0.82 EX2 441,579 0 2.Q6 A 10.14 DEV1 0 35,877 40.01 A 0.82 DEV2 0 441,579 40.0.6 A 10.14 RATTLESNAKE RIDGE TIME OF CONCENTRATION Runoff Coefficient Basin Parameters t 1� Percent Overland Flow le Concentrated Flow Basin I.D. Imperviousness Soil Classification Area t; t, Final t, C? iwil C100 Length Slope Length Slope Type of Land Surface t, tc Check (1 /100) (acres) (feet) (ft/ft) (minutes) (feet) (ft/ft) r (min.) (minutes) (minutes) O51 _ 26 A 0.00 0.00 0.22 30.10 300 _ 0.030 24.2 600 0.050 Short Pasture and Lawns 6.4 30.6 YES 30.6 EX1 26 A 0.00 0.00 0.22 0.82 20 0.030 6.2 0. 0.005 Short Pasture and Lawns 0.0 6.2 YES _ 6.2 EX2 21 A 0.00 0.00 0.22 10.14 180 0.030 18.7 500 0.005 Short Pasture and Lawns 16.8 35.6 YES 35.6 DEV1 401 A 0.19 0.25 _ 0.41 0.82 20 0.020 5.6 O 0.010 Nearly Bare Ground 0.0 5.6 YES 5.6 DEV2 401 A 0.19 0.25 0.41 10.14 210 0.010 22.7 S00 0.005 Nearly Bare Ground 11.8 34.5 YES 34.5 RATTLESNAKE RIDGE BASIN HYDROLOGY Time of _ Runoff Coefficients Rainfall Intensity Runoff Design Basin Area 2-Year 100-Yearp-Year 100-Year Basin ill Concentration Year 100-Year �1 Point C2 C100 12 1100O2 0100 (acres) (minutes) (in./hour) (in./hour) ft3/s) (ft3/s) OS1 OS 30.10 30.6 0.00 0.22 1.6 4.3 0.0 27.8 _ EX1 _ 1 0.82 6.2 0.00 0.22 3.3 8.8 0.0 1.6 EX2 1 10.14 35.6 0.00 0.22 1.4 3.9 0.0 8.5 DEV1 2 0.82 5.6 0.19 0.41 _ 3.5 9.2 0.5 3.1 DEV2 2 10.14 34.5 0.19 0.41 1.4 3.9 2.7 16.2 Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Appendix C : Swale Analysis C Normal Flow Analysis - Trapezoidal Channel Project: Rattlesnake Ridge Channel ID: Swale A-A F `• \NH .... Ito1 le' � - Z1 Z - B - Design Information (Input) Channel Invert Slope So = 0.0392 ft/ft Manning's n n = 0.035 Bottom Width B = 0.00 ft Left Side Slope Z1 = 4.00 ft/ft Right Side Slope Z2 = 4.00 ft/ft Freeboard Height F = 0.00 ft Design Water Depth Y = 1 .50 ft Normal Flow Condtion (Calculated) Discharge Q = 61 .37 cfs Froude Number Fr = 1 .39 Flow Velocity V = 6.82 fps Flow Area A = 9.00 sq ft Top Width T = 12.00 ft Wetted Perimeter P = 12.37 ft Hydraulic Radius R = 0.73 ft Hydraulic Depth D = 0.75 ft Specific Energy Es = 2.22 ft Centroid of Flow Area Yo = 0.50 ft Specific Force Fs = 1 .09 kip Swale A-A.xls, Basics 6/26/2015, 1 :01 PM Normal Flow Analysis - Trapezoidal Channel Project: Rattlesnake Ridge Channel ID: Swale B-B F AlI - T VZ2 V ; 1 I. lf°Z1 B Design Information (Input) Channel Invert Slope So = 0.0050 ft/ft Manning's n n = 0.035 Bottom Width B = 0.00 ft Left Side Slope Z1 = 4.00 ft/ft Right Side Slope Z2 = 50.00 ft/ft Freeboard Height F = 0.00 ft Design Water Depth Y = 1 .00 ft Normal Flow Condtion (Calculated) Discharge Q = 51 .12 cfs Froude Number Fr = 0.47 Flow Velocity V = '1 .89 fps Flow Area A = 27.00 sq ft Top Width T = 54.00 ft Wetted Perimeter P = 54. 13 ft Hydraulic Radius R = 0.50 ft Hydraulic Depth D = 0.50 ft Specific Energy Es = 1 .06 ft Centroid of Flow Area Yo = 0.33 ft Specific Force Fs = 0.74 kip Swale B-B.xls, Basics 6/26/2015, 1 :02 PM Normal Flow Analysis - Trapezoidal Channel Project: Rattlesnake Ridge Channel ID: Swale C-C F `• _ T 1' 1 I. yo 1 Z1 Z2 Design Information (Input) Channel Invert Slope So = 0.0050 ft/ft Manning's n n = 0.035 Bottom Width B = 0.00 ft Left Side Slope Z1 = 5.00 ft/ft Right Side Slope Z2 = 10.00 ft/ft Freeboard Height F = 0.00 ft Design Water Depth Y = 2.00 ft Normal Flow Condtion (Calculated) Discharge Q = 89.71 cfs Froude Number Fr = 0.53 Flow Velocity V = 2.99 fps Flow Area A = 30.00 sq ft Top Width T = 30.00 ft Wetted Perimeter P = 30.30 ft Hydraulic Radius R = 0.99 ft Hydraulic Depth D = 1 .00 ft Specific Energy Es = 2. 14 ft Centroid of Flow Area Yo = 0.66 ft Specific Force Fs = 1 .76 kip Swale C-C.xls, Basics 6/26/2015, 1 :06 PM Normal Flow Analysis - Trapezoidal Channel Project: Rattlesnake Ridge Channel ID: Swale D-D F AlI - T V ; 1 Z1 V B Design Information (Input) Channel Invert Slope So = 0.0050 ft/ft Manning's n n = 0.035 Bottom Width B = 0.00 ft Left Side Slope Z1 = 5.00 ft/ft Right Side Slope Z2 = 4.00 ft/ft Freeboard Height F = 0.00 ft Design Water Depth Y = 2.00 ft Normal Flow Condtion (Calculated) Discharge Q = 53.31 cfs Froude Number Fr = 0.52 Flow Velocity V = 2.96 fps Flow Area A = 18.00 sq ft Top Width T = 18.00 ft Wetted Perimeter P = 18.44 ft Hydraulic Radius R = 0.98 ft Hydraulic Depth D = 1 .00 ft Specific Energy Es = 2. 14 ft Centroid of Flow Area Yo = 0.66 ft Specific Force Fs = 1 .05 kip Swale D-D.xls, Basics 6/26/2015, 1 :06 PM Rattlesnake Ridge Electrical Sub-Station - Final Drainage Report June 2015 Appendix D : Detention Pond & Outlet Analysis D DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: RATTLESNAKE RIDGE Basin ID: DETENTION POND (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) r- , Determination of MINOR Detention Volume Using Modified FAA Method Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input): Design Information (Input): Catchment Drainage Imperviousness la= 40.00 percent Catchment Drainage Imperviousness la= 40.00 percent Catchment Drainage Area A= 11.000 acres I Catchment Drainage Area A= 11.030 acres Predevelopment NRCS Soil Group Type= A A,B,C,or D Predevelopment NRCS Soil Group Type= A A,B,C,or D Return Period for Detention Control T= 10 years(2,5,10,25,50,or 100) Return Period for Detention Control T= 100 years(2,5, 10,25,50,or 100) Time of Concentration of Watershed Tc= 35 minutes Time of Concentration of Watershed Tc= 35 minutes Allowable Unit Release Rate q= 0.16 cfs/acre Allowable Unit Release Rate q= 0.16 cfs/acre One-hour Precipitation Pi = 1.61 inches One-hour Precipitation Pi= 265 inches Design Rainfall IDF Formula i=C,"P,/(C2+Tc)^C3 Design Rainfall IDF Formula i=C1•P1/(C2+Ta)"C3 Coefficient One Ci= 28.50 Coefficient One Ci= 28.50 Coefficient Two C2= 10 Coefficient Two C2.= 10 Coefficient Three C3= 0.789 Coefficient Three C3= 0.789 Determination of Average Outflow from the Basin (Calculated): Determination of Average Outflow from the Basin (Calculated): Runoff Coefficient C= 0.30 Runoff Coefficient C= 0.41 Inflow Peak Runoff Op-in= 7.58 cfs Inflow Peak Runoff Op-in= 17.05 cfs Allowable Peak Outflow Rate Op-out= 1.80 cfs Allowable Peak Outflow Rate Qp-out= 1.80 cfs Mod. FAA Minor Storage Volume = 15.060 _cubic feet Mod.FAA Major Storage Volume= 48,260 cubic feet Mod. FAA Minor Storage Volume= 0.346 acre-ft Mod.FAA Major Storage Volume= 1.108 acre-ft 5 c Enter Rainfall Duration Incremental Increase Value Here(e.g.5 for 5-Minutes) Rainfall Rainfall Inflow Adjustment Average Outflow Storage Rainfall Rainfall Inflow Adjustment Average Outflow Storage Duration Intensity Volume Factor Outflow Volume Volume Duration Intensity Volume Factor Outflow Volume Volume minutes inches/hr acre-feet "m" cfs acre-feet acre-feet minutes inches/hr acre-feet "m' cfs acre-feet acre-feet (input) (output) (output) (output) (output) (output) (output) (input) (output) (output) (output) (output) (output) (output) 0 I_ 0.00 0.000 0,00 0.00 0.000 0.000 0 0:00 0.000 0.00 0.00 0.000 0.000 5 5.42 0.123 1.00 1.80 0.012 0.111 5 8.92 0.277 1.00 1.80 0.012 0.265 10 4.32 0.196 1.00 1.80 0.025 0.171 10 7.11 0.441 1.00 1.80 0.025 0.417 15 3.62 0.247 1.00 _1.80 0.037 0.210 15 5:96 0.555 1.00 1.80 0.037 0.518 20 3.13 0.285 1.00 1.80 0.050 0.235 20 5.16 0.641 1.00 1.80 0.050 0.591 25 2.78 0.315 1.00 1.80 0.062 0.253 25 4.57 0.710 1.00 1.80 0.062 0.647 30 2.50 0.341 1.00 _1.80 0:075 0.266 30 4.11 - 0.766 1.00 1.80 0.075 0.692 35 _ 2.28 0.362. 0:99 1.79 0.086 0.276 35 3.75 0.815 0.99 1.79 0.086 0.728 40 2.09 0.381 0.93 1.68 0.093 0.288 40 3.45 0.857 0,93 1.68 0.093 0.764 45 1.94 0.397 0.88 1.59 0.099 0.299 45 3.20 - 0.894 0.88 1.59 0.099 0/95 50 1.81 0412 0.85 1.52 0.105 0.307 50 2:99 0.928 0.85 1.52 0.105 0.823 55 1.70 0.426 0.81 1.47 0.111 0.315 55 2.80 0.958 0.81 1.47 0.111 0.847 60 1.61 0.438 0.79 1.42 0.117 0.321 60 2.64 0.986 0/9 1.42 0117 0.868 65 1.52 0.450 0.77 1.38 0.124 0.326 65 2.50 1.011 0.77 1.38 0.124 0.888 70 1.45 0460 0.75 1.35 0.130 0.330 70 2.38 1.035 0/5 1.35 0.130 0.905 75 1.38 0.470 0.73 1.32 0.136 0.334 75 2.27 1.057 0.73 1.32 0.136 0.921 80 1.32 0.479 0.72 1.29 0.142 0.337 80 2.17 1.078 0.72 1.29 0.142 0.936 - 85 1.26 0.488 0.70 1.27 0.148 0.339 85 2.08 1.097 0.70 1.27 0.148 0,949 90 1.21 0.496 0.69 _1.25 0.155 0.341 90 2.00 1.116 0.69 1.25 0.155 0.961 - 95 1.17 0.504 0.68 1.23 0.161 0.343 95 1.92 1.133 0.68 1.23 0.161 0.972 - 100 1.12 0.511 0.67 1.21 0.167 0.344 100 1,85 1150 0.67 1.21 0.167 0.983 105 1.09 0.518 0.66 1.20 0.173 0.345 105 1.79 1.166 0.66 1.20 0173 0.992 - 110 1.05 0.525 0.66 1.18 0.180 0.345 110 1.73 1.181 0.66 1.18 0.180 1.001 - 115 1.02 0.531 0.65 1.17 0.186 0.346 115 1.67 1.196 0.65 1.17 0.186 1.010 120 0.99 0.538 0.64 1.16 0.192 0.346 120 1.62 1.210 0.64 1.16 0192 1.018 125 0.96 0.544 0.64 1.15 0.198 0.345 125 1.57 1.223 0.64 1.15 0.198 1.025 _ 130 0.93 0.549 0.63 1.14 0.204 0.345 130 1.53 1.236 0.63 1.14 0,204 1.032 135 0.90 0.555 0.63 _1.13 0.211 0.344 135 1.49 1.248 0.63 1.13 0.211 1.038 140 0.88 0.560 052 1.12 0.217 0.344 140 1:45 1.260 0.62 1.12 0.217 1.044 145. 0.86 0.566 0.62 1.12 0.223 0.343 145 1.41 1.272 0.62 1.12 0.223 1.049 150 0.84 0.571 0.62 1.11 0.229 0.341 150 1:38 1.283 0.62 1.11 0.229 1.054_ 155 0.82 0.575 051 1.10 0235 0.340 155 1.34 1.294 0.61 1.10 0.235 1.059 160 0.80 0.580 0.61 1.10 0.242 0.339 160 1.31 1.305 0.61 1.10 0.242 1.063 165 0.78 0.585 0.60 1.09 0.248 0.337 165 1.28 1.315 0.60 1.09 0.248 1.068 170 0.76 0.589 050 1.09 0.254 0.335 170 1.26 1.325 0.60 1.09 0.254 1.071 175 0.75 0.594 0.60 1.08 0.260 0.333 175 1.23 1.335 0.60 1.08 0.260 1.075 180 0/3 0.598 0.60 1.07 0.267 0.331 180 1.20 1.345 0.60 1.07 0.267 1.078 185 0.72 0.602 0.59 1.07 0.273 0.329 185 1.18 1.354 0.59 1.07 0.273 1.081 190 0.70 0.606 0.59 1.07 0.279 0.327 190 1.15 1.363 0.59 1.07 0,279 1.084 195 0.69 0.610 0.59 1.06 0.285 0.325 195 113 1.372 0.59 1.06 0.285 1.087 200 0.68 0.614 0.59 1.06 0.291 0.322 200 1.11 1.381 0.59 1.06 0.291 1.089 205. 0.66 0.618 0.58 1.05 0.298 0.320 205 1.09 1.389 0.58 1.05 0,298 1.092 210 0.65 0.621 0.58 1.05 0.304 0.31_8 210 1.07 1.398 0.58 1.05 0.304 1.094_ 215 0.64 0.625 0.58 1.05 0.310 0.315 215 1.05 1.406 0.58 1.05 0.310 -1.096_ 220 0.63 0.628 0.58 1.04 0.316 0.312 220 1.03 1.414 0.58 1.04 0.316 1.097 225 0.62 0.632 0.58 1.04 0.322 0.310 225 1.02 1.421 0.58 1.04 0:322 1.099 - 230 0.61 0.635 0.58 1.04 0.329 0.307 230 1.00 1.429 0.58 1.04 0.329 ~1.101 - 235 0.60 0.639 0.57 1.03 0.335 0.304 235 0.98 1.437 0.57 1.03 0.335 1.102 240 0.59 0.642 0.57 1.03 0.341 0.301 240 0.97 1.444 0.57 1.03 0.341 1.103 - 245 0.58 0.645 0.57 1.03 0.347 0.298 245 _ 0.95 1.451 0.57 1.03 0.347 ~1.104 _ 250 0.57 0.648 0.57 1.03 0.353 0.295 250 0.94 1.458 0.57 1.03 0.353 1.105 255 0.56 0.651 0.57 1.02 0360 0.292 255 0.93 1.465 0.57 - 1.02 0.360 1.106 260 0.55 0.654 0.57 1.02 0.366 0.289 260 0.91 1.472 0.57 1.02 0.366 - 1.106 265. 0.55 D.657 0.57 1.02 0.372 0,285 265 0.90 1.479 0.57 1.02 0.372 1,107 270 0.54 0.660 0.56 _1.02 0378 0.282 270 0.89 1.486 0.56 - 1.02 0.378 1.107 275 053 0.663 0.56 1.02 0.385 0.279 275 0.87 1.492 0.56 - 1.02 0.385 - 1.108 280 0.52 0.666 0.56 1.01 0.391 0.275 280 0.86 1.498 0.56 1.01 0.391 1.108 285 0.52 0.669 0.56 1.01 0.397 0.272 285 0.85 1.505 0.56 1.01 -1 0.397 1.108 290 051 0.672 056 1.01 0403 0.269 290 0.84 1.511 0.56 _ 1.01 0.403 _ _ 1.108_ 295 0.50 0.674 0.56 1.01 0.409 0,265 295 0.83 1.517 0.56 I101 0.409 1108 300 0.50 0.677 0.56 1.01 0.416 _ 0.262 300 0.82 1.523 0.56 1.01 0.416 1 108 - Mod.FAA Minor Storage Volume(cubic ft.)= 15,060 Mod. FAA Major Storage Volume(cubic ft.)= 48.260 Mod.FAA Minor Storage Volume(acre-ft.). 0.3457 Mod. FAA Major Storage Volume (acre-ft.)= 1.1079 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.34, Released November 2013 Detention Pond.xls,Modified FAA 6/26/2015,12:54 PM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: RATTLESNAKE RIDGE Basin ID: DETENTION POND Inflow and Outflow Volumes vs. Rainfall Duration 1.6 1.4 1.2 • � � � � � � � • • • • • • • • • • • • • ♦ • • • • • • • • • • • • • • • 1 • • • • • • • • • • • 0.8 • 10 • d • • . 0.6 0.4 rev 0000 V COO OQ 00000 O 000000 ) V 0.2 0 0 50 100 150 200 250 300 350 Duration (Minutes) —Minor Storm Inflow Volume —Minor Storm Outflow Volume o Minor Storm Storage Volume r.—Major Storm Inflow Volume —w—Major Storm Outflow Volume • Major Storm Storage Volume UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.34, Released November 2013 Detention Pond.xls,Modified FAA 6/26/2015, 12:54 PM STAGE-STORAGE SIZING FOR DETENTION BASINS Project: RATTLESNAKE RIDGE Basin ID: DETENTION POND Side Slope Z iii Dam ------______Side Slope Z Dam Side Slapez A Flaw F7o� Dam 11/4. L Flow W 41/4 W� 4.._-4 W v iY Side Slope Z < )n < I -Y Siie Slope L Y Side Slope z I. Design Information (Input): Check Basin Shape_ Width of Basin Bottom. W = ft Right Triangle OR... Length of Basin Bottom, L = ft Isosceles Triangle OR... Darn Side-slope (H:V), Zd = ft/ft Rectangle _ OR... Circle / Ellipse OR... Irregular (Use Overide values in cells G32:G52) MINOR MAJOR Storage Requirement from Sheet 'Modified FAA': ! 0.35 I 1.11 acre-ft. Stage-Storage Relationship: Storage Requirement from Sheet 'Hydrograph': acre-ft. Storage Requirement from Sheet 'Full-Spectrum': 0.06 0.20 acre-ft. Labels Water Side Basin Basin Surface Surface Volume Surface Volume Target Volumes for WQCV, Minor, Surface Slope Width at Length at Area at Area at Below Area at Below for WQCV, Minor, & Major Storage Elevation (H:V) Stage Stage Stage Stage Stage Stage Stage & Major Storage Stages ft fUft ft ft ft2 ft2 User ft3 acres acre-ft Volumes (input) (input) Below El. (output) (output) (output) Overide (output) (output) (output) (for goal seek) 4797.43 (input) 40 0 0.001 0.000 ~ 4797.50 0.00 0.00 1 ,355 49 I 0.031 0.001 4798.00 0.00 I 0.00 30,383 7,983 0.697 0.183 4798.50 0.00 0.00 52.700 28,754 1.210 0.660 4799.00 0.00 0.00 62.212 57,482 1.428 1.320 4799.20 0.00 0.00 _ 67,385 70,442 1.547 1.617 #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #NIA #N/A #NIA #N/A #NIA #N/A #NIA #N/A #NIA__ #N/A #NIA #N/A #NIA #NIA #N/A #N/A #N/A #N/A #N/A i #NIA #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #NIA #N/A #NIA #N/A #NIA #N/A #N/A #N/A I #NIA #N/A #NIA Detention Pond.xls, Basin 6/26/2015, 12:54 PM STAGE-STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: STAGE-STORAGE CURVE FOR THE POND 6000.00 5000.00 - • ♦ ♦ ♦ ♦ 4000.00 - G) 3000.00 G) a, Ct co 2000.00 - 1000.00 - 0.00 0.00 0.20 0.40 0.60 0.80 1 .00 1 .20 1 .40 1 .60 1 .80 Storage (acre-feet) Detention Pond.xls, Basin 6/26/2015, 12:54 PM RATTLESNAKE RIDGE ORIFICE CALCULATION Urban Drainage Orifice Equation (SO-15) Q = CA(2gH)^0.5 Target Orifice Discharge 1.76 cfs Estimated Radius 4 inches Water Depth 1.4 feet C = 0.6 g = 32. 2 ft/sec^2 H = 1.066667 ft A = 0.349066 ft^2 Q = 1.735865 cfs RATTLESNAKE RIDGE WEIR CALCULATIONS Weir Flow Weir Flow Pond Top of Weir Width 100-Yearq Dept Elevation Elevation Berm Detention Pond ID Peak Inflow LW d L 4 (feet) (feet) (feet) (feet) (feet) OUTLET STRUCTURE 19.3 30 0.33 4798.83 4799.16 4799.20 EMERGENCY SPILLWAY 19.3 75 0.18 4799 4799. 18 4799.20 Weir Coefficient (Cw) = 3.33 c LEGEND f / si ♦ DRAINAGE BASIN BOUNDARY ♦ ` A BASIN ID o AREA (ACRES) Z N e ® ` 1 .42 ac ° w ♦ ` 2% IMPERVIOUSNESS (%) E ire ♦ 1 / r \ DESIGN POINT ��a Ng3 - III - ---- 100- YEAR FLOODPLAIN ♦ ♦ u, I- 0 r ♦ ♦ ♦ ♦ OS1 O ♦ <oJa) J ♦ o•D 2% J W ♦ W „ , < zz � o ♦ aQ O J = J O J - O � E o ` W OU � Z w � Z O CD fYO O Nr. 00 O d O C w v- O G 1 ® Lo N co ® I N. Z O Z N. t r Q a • / V VI V i I \--II ( 4::( / CO alit law •s aI WImEm W Q 1 ___: 1:".. ' \ / CV �.v y i� I EX 1 Ex I O �0/ 0 CO v / '\ \ \ 54. I 0.82 ac 6 Om oC0 / yVv I 2% � - 50.00' 1 LLI / 0 W W \ '�� - \ ` � W D` 11 \ � O N � I - Q J 0 c � L Z Z W CD / vv / v , ' � � Q j w � � � / / � / �.lI . ' L W W J W / / / I I- 0 / F W OS1 EX2 oG 30. 1 ac A y � / � 10.14ac Z yl 0) / \\ \\\ / II 1 / --X- ` - _ _ --- /FILE NAME: Q - 2 I \I/ /5I I/ // I il / DE5000�5 .0007. 00_RSR USR I ! \ i i i I EX2SNITEOPOWER DAH / I / / �` / CHECKED: / I �/ / �� \ , y Your Touchstone Energy. Partner I / / A�7DAH2/ \ / JOB NO: Ltr a /41-1/:di3131) 0005 .0007. 00 CALL THE UTILITY NOTIFICATION CENTER OF COLORADO0. N 7 j/1I ' SCALE: cu 1 ' f 1 e � 1", = 100' / / 7 11I i I I COLORADO 8111 DATE: I® s - �- __. �. a� a>_ a� a>_ �! m 0 100 200 JUNE 26 , 2015 1 � p /� N. Y� a m O 8 0 0 0 5 8 0 e, O m o m m m m m m el 3 DAYS BEFORE YOU DIG L // ,9� .o a zi v i a a T r. a a 811 OR 1-800-922-1987 SHEET: // scale i" = 100 feet O� www.UNCC.org // I I 1 // I I I I 1 of 3 0" 1" BAR IS ONE INCH ON ORIGINAL DRAWING ig.f LEGEND Fe I 4 \ I 1 DRAINAGE BASIN BOUNDARY LI I El EH BASIN ID z 0 0 I �' q II A AREA (ACRES) i I ci I • e I 1 .42 ac o w 1S-1 \ I y � I l 2% IMPERVIOUSNESS (�) ►yam , �♦I 9/ I / DESIGN POINT ‘ ii / ii l ► I I 1 v I I - III __- -- 100-YEAR FLOODPLAIN I ii ��► I / II 'ii ► i \ SWALE CONSTRUCTION TABLE ° J I` \ i / r I IA I o / , w Irk / m II = SWALE DESIGNATION BOTTOM WIDTH (W) zi Z2 SLOPE (%) DEPTH (D) I SWALE A-A 0 4 4 3.92 1 .5' / tb SWALE B-B SEE BELOW I IIv SWALE C-C 0 10 5 0.50 2.0' J t� fet op / SWALE D—D 0 4 5 0.50 2.0' : swim / s- you Q . ,," KZ CO CO \ \ / 50.00' m - P17-0 Th D _i O �\ NI--. q . C VARI� fl CO W Q / Ni � � I v v m I 0 2. C5UC7Z w2 c.y� - -- / A., \ — -I �� _ ,/ � �� es - _ 3oz , % % Ross.. 4�se. (7 pl � ® 7l ( � / . 6', . , °` ® SWALE DESIGNATION Z1 Z2 SLOPE (%) DEPTH (D) Z = U o / I A J �O n3. y v \ x k p,y,6- x SF- x x x x x x Ix x x x H Q B J �// 480039 � - FLi9n00 SWALE B-B 4 4 0.50 0.5' W N Z cp t 4800.82 ^^ --► 8 479 DEV1 I I x NOTE: -- Z -I N � PR. 20 FT DRIVE W/2% � ..tea o / / CROSS-SLOPE N- N. 4800 w CJ co o 00 00 / \ \ R3. 4eozo9 DEV1 \ 4am•"� 4801 RVG 4801.07 4797 ! 1 ,-479875 K 1 . DEPTH SHOWN ON DIAGRAM ABOVE INDICATES A Z j O J I srR + — t� 6 so.00 . X MINIMUM DEPTH OF SWALE. CATCH SLOPES CREATE U w J " / \ \ \ I A • 95 ` 082 at m \ —+� _ „ es m 4807 , � + 773.76 r " ' GREATER DEPTH ABOVE AMOUNTS INDICATED IN TABLES - ,I 0 = toRVG • (RVG) ABOVE. / \ V A �,� f�� s4 4907.88 480.5.9 e7 V . .e5 4803. < III :. .79798.� 7sno0 _ / 4809.,,E /' � 12: 4501.89 / PAp , . . . . �� iii EROSION CONTROL LEGEND / V A 48 a. 0 qo �0 , ��o 1.RIDGE) 1, t.ox per. "4 . . icy ° °■ i.mc % . 3: 1 x / O t =`< 58 0 it . l� LL lf.o / wit •` PR. 20 FT DRIVE W/2.'b v7 a.ax / t.27c ) 4� 1 �/ c c I / - y CROSS-SLOPE GRADEsF ® SILT FENCE / / i (DIP-3) OUTLET STRUCTURE WATTLE FILTER / � \ \ �� RVG ' I• �Y / � _ �9 .111I • �/ / / \ 801• WD v o / ' 4 / ` v � V 'iv wI WD WATTLE DIKE (STRAW) O OS � � `$ / DEVZ NNNN E 1 / � i : ; + RR RIPRAP Z K30. 1 ac \1\ "�� o3 ago" , � 10. 14 ac • ,•I I `• x _ t SR SURFACE ROUGHENING tit/ 0.9 . 2% \ 1 a 40% RD \ 53 .00' o LL 1 ,y1 ® (RVG) REVEGETATION • Om / \ �. 238.75' - T 178.75' 1 {208.75' 208.75`°' ( i x m W ( \ OS 1 3 �/-' / �� m �4,. RVG) \ r , /Ory \ / s * 4 nab 798.75 = � 7 /�� / � �� am r _ �/ u Y x ` NOTES -. N in w D N D • • —/ �I- � � \ _ \ a :. J - I.0 .SL lFr.-i _ ��— - .�� 795._/795.92 I IY� v I I SR o / o., — — _ o, ► _ 1 . CONTRACTOR SHALL FOLLOW ALL RECOMMENDATIONS OF THE w W Z (RVG ogt o Mel 1 7 793.7755 — — _ STORMWATER MANAGEMENT PLAN , AND A COPY OF THE PLAN \ o PAD c \ ( x•04 SHALL REMAIN ON -SITE AT ALL TIMES. U ( RE-ROUTED 10 FT ` ( , 0 1 DRIVEWAY ® GRADE / J RIDGE �y �, > 0 1. 2% CROSS-SLOPE Ce o ( / ��. �o o Ir +e5t.55 x , 2. OUTLET STRUCTURE CONSTRUCTION DETAIL FOUND ON SHEET 3 O �� \ c I . J. / / LL st<�aty sr ..:::. ... .:. .a,. , r:'.<:.: �[ �� OF 3. 0 CO (\ H 0 / � A I 1 "' I x 3. EROSION CONTROL BMP DETAILS FOUND ON SHEET 3 OF 3. 0 W0 / I '>�d X9]1 '2 // � 4799.78--� i--478D.2A 480129-� 47Y9.20� 4799.1 799. 9 If) / ' 4799.29 4790.19__y 1C-4798.34 J wY .02 1 - 4790.77 - I '-47963 V SR 4 4797. 4797. 799A0112.X3' 'w x / &°t m 479643 Gi G 4797.EII OUTLET SRUCTURE 79800 INV. = 4797.43 Z O FL J j7A (RVG) FL FL FL p't FL L DIP 3 v-479733 5 - 12" HDPE ® 1 .0� / 734 4)98 DEV2 ` 4797. 4: 11 INV. OUT=4797.33 x INV. IN=4797.43 ten CO / / / I I 75.2+ -4798 47p 7et:00 / 1 - 8" ORIFICE (PVC OR HDPE) Lou �Wj 47. _ 7s. _ e-- ® x x I x "` __ - - SF di 4 99 x 479 >A'i ` x x _x, >4 x CD I/ ' / . J X4799.78 4798.27--� 1--47 .52 I / �� \�i a m $ I 3. $iii ? m DETENTION POND ° 9 ; $ " I 100YR VOLUME = 1 .1 AC-FT I I Q f I 100YR WSEL = 4798.83 // I I I TOP OF POND = 4799.20 1 I I WEIR ELEV. = 4799.00 RELEASE RATE = 1 .76 CFS I Cie FREEBOARD = 0.37 FT - - cs o° / w � 7-k :CP O/ I� FILENAMEe0005 .0007. 00_RSR USR y / DESIGNED/ SNITEOPOWER DAH I� \ Your Touchstone Fncrgy. Farmer CHECKED: / \ DAH i JOB NO: 0005 .0007. 00 LCALL THE UTILITY NOTIFICATION CENTER OF COLORADO _ SCALE: f1 ' ", L COLORADO, 811 . DATE: 1 = 100 0 100 200 KNOW WHAT ' S BELOW. GALL you oiu . ip IJUNE 26 , 2015 3 DAYS BEFORE YOU DIG scale r' = 100' feet 811 OR 1-800-922-1987 SHEET: www.UNCC.org / I -. Jo" 1" BAR IS ONE INCH ON ORIGINAL DRAWING / 2 OF 3 r Z cr 6 Z V O ,n N w > O cZ z cZ 0 w c Surface Roughening (SR) EC-1 Silt Fence (SF) SC-1 SC-1 Silt Fence (SF) 0 CWA A -SIGN • S � w SF—� — If--I 174" x I r4" SF SuT FENCE INSTALIATION NOTES �. o (RECOMMENDED) WOODEN 1 . SILT FENCE MUST BE PLACED AWAY FROM THE TOE OF THE SLOPE TO ALLOW FOR WATER �\ 3.1 / TRACKING OR FENCE POST WITH 10' MAX PONDING. SILT FENCE AT THE TOE OF A SLOPE SHOULD BE INSTALLED IN A FLAT LOCATION S -- IMPRINTING SPACING AT LEAST SEVERAL FEET (2-5 FT) FROM THE TOE OF THE SLOPE TO ALLOW ROOM FOR / -z-- PONDING AND DEPOSITION. riH 8'x8' MIN. `I�``- ^; ��. SILT FENCE 2. A UNIFORM 6° X 4" ANCHOR TRENCH SHALL BE EXCAVATED USING TRENCHER OR SILT ��, J L� GEOTEXT LE 3:1 3:1 FENCE INSTALLATION DEVICE. NO ROAD GRADERS, BACKHOES, OR SIMILAR EQUIPMENT SHALL SEE VEHICLE TRACKING ` ≥ BE USED. CONTROL DETAIL FOR DESIGN OF PAD 3. COMPACT ANCHOR TRENCH BY HAND WITH A "JUMPING JACK° OR BY WHEEL ROLLING. A COMPACTION SHALL BE SUCH THAT SILT FENCE RESISTS BEING PULLED OUT OF ANCHOR / 3:1 TRENCH BY HAND. -`� COMPACTED v- _ '�' BACKFILL 4. SILT FENCE SHALL BE PULLED TIGHT AS IT IS ANCHORED TO THE STAKES. THERE SHOULD BERM BE NO NOTICEABLE SAG BETWEEN STAKES AFTER IT HAS BEEN ANCHORED TO THE STAKES. 5. SILT FENCE FABRIC SHALL BE ANCHORED TO THE STAKES USING 1 " HEAVY DUTY STAPLES _ PLAN VIEW �" MA FLQW� 36"-48" OR NAILS WITH 1 " HEADS. STAPLES AND NAILS SHOULD BE PLACED 3" ALONG THE FABRIC 12°_ BERM AROUND PERIMETER TYP. DOWN THE S7AXE. GROUND SURFACE EXISTING 7 i - - 6. AT THE END OF A RUN OF SILT FENCE ALONG A CONTOUR, THE SILT FENCE SHOULD BE / 21-0° MIN. GROUND i TURNED PERPENDICULAR TO THE CONTOUR TO CREATE A "J-HOOK." THE "J-HOOK" _ - --- _ _ I � FURROWS 2" TO 4" DEEP 6" MIN ` EXTENDING PERPENDICULAR TO THE CONTOUR SHOULD BE OF SUFFICIENT LENGTH TO KEEP _�_��-_ - 12' MIN. 1 RUNOFF FROM FLOWING AROUND THE END OF THE SILT FENCE (TYPICALLY 10' - 20' -�- _- 2" TO WITH 6" MAXIMUM SPACING k ( ) 4" DEEP �� PAR I Fl TO CONTOURS t j 18" 7. SILT FENCE SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING ACTNATIES. AT LEAST 10" MIN COMPACTED EMBANKMENT 8'x6' MIN. .. r CO SILT FENCE MNNTENANCE NOTES MATERIAL TYP 3:1 OR FLATTER 0 (n CO LM SR- 1 . SURFACE ROUGHENING •TAIL" SHALL BE 4" MIN OF SILT FENCE OR ASREOUIREDTO SIDE SLOPES i J Z Z O FOR STEEP SLOPES (3:1 OR STEEPER) BURIED 1 . INSPECT OMPs EACH WORKDAY, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITION. �� CONTAIN WASTE CONCRETE MAINTENANCE OF BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS Q CO POSSIBLE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE O_ 1 EROSION, AND PERFORM NECESSARY MAINTENANCE. SECTION A - J O 2. FREQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN BMPs IN (n L~L Q EFFECTIVE OPERATING CONDITION. INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE CONCRETE WASHOUT AREA INSTALLATION NOTES40OR TILLING ,! � -- DOCUMENTED THOROUGHLY. 1. SEE PLAN VIEW FOR LOCATIONS OF CONCRETE WASHOUT AREA ° Z I W 0 OR TILLING 1 � , � Lr 11--- - SILT FENCE _ O � O \` �� / D. WHERE BMPs HAVE FAILED, REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON 2. THE CONCRETE WASHOUT AREA SHALL BE INSTALLED PRIOR TO ANY / / POSTS SHALL OVERLAP DISCOVERY OF THE FAILURE. - O / .. AT JOINTS SO THAT NO GAPS CONCRETE PLACEMENT ON SITE. Ur O) 2,/_____------ , JOIN EXIST IN SILT FENC 4. SEDIMENT ACCUMULATED UPSTREAM OF THE SILT FENCE SHALL BE REMOVED AS NEEDED 3. VEHICLE TRACKING CONTROL IS REQUIRED AT THE ACCESS POINT. Z = N FIRST TO MAINTAIN THE FUNCTIONAUTY OF THE BMP, TYPICALLY WHEN DEPTH OF ACCUMULATED € �' o O p SEDIMENTS IS APPROXIMATELY 6". 4. SIGNS SHALL BE PLACED AT THE CONSTRUCTION ENTRANCE, AT THE WASHOUT AREA, AND W N Z CO ELSEWHERE AS NECESSARY TO CI FARLY INDICATE THE LOCATION OF THE CONCRETE W < r--- ROTATE ■■ 5. REPAIR OR REPLACE SILT FENCE WHEN THERE ARE SIGNS OF WEAR, SUCH AS SAGGING, WASHOUT AREA TO OPERATORS OF CONCRETE TRUCKS AND PUMP RIGS. Z - I N '/ SECOND �■I TEARING, OR COLLAPSE. - W 5. EXCAVATED MATERIAL SHALL BE UTILIZED IN PERIMETER BERM CONSTRUCTION F 0 CO > POSTS SHALL BE JOINED AS 6. SILT FENCE IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED Z r' THEN ROTATED 180 DEG. THICKNESS OF GEOTE%TILE HAS, AND APPROVED BY THE LOCAL JURISDICTION, OR IS REPLACED BY AN EQUIVALENT PERIMLILH CONCRETE WASHOUT AREA MAINTENANCE NOTES - or- SHOWN, IN DIRECTION SHOWN AND DRIVEN BEEN EXAGGERATED, TYP SEDIMENT CONTROL BMP. W I r J " / INTO THE GROUND 1. THE CONCRETE WASHOUT AREA SHALL BE REPAIRED AND ENLARGED OR CLEANED OUT AS Nit ..---- 7. WHEN SILT FENCE IS REMOVED, ALL DISTURBED AREAS SHALL SE COVERED WITH TOPSOIL, NECESSARY TO MAINTAIN CAPACITY FOR WASTED CONCRETE. J ROUGHENED ROWS SHALL BE 4" TO 6" SEEDED AND MULCHED OR OTHERWISE STABILIZED AS APPROVED BY LOCAL JURISDICTION. 4" TO 6° DEEP WITH 6" MAXIMUM SPACING PARK I FI SECTION A 2. AT THE END OF CONSTRUCTION, ALL CONCRETE SHALL BE REMOVED FROM THE SITE AND DISPOSED 9E DEEP TO CONTOURS (DETAIL ADAPTED FROM TOWN OF PARKER, COLORADO AND CITY OF AURORA NOT AVAILABLE IN AUTOCAD) OF AT AN APPROVED WASTE SITE. SR- 2. SURFACE ROUGHENING NOTE: MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY FROM UDFCD STANDARD DETAILS. 3. WHEN THE CONCRETE WASHOUT AREA IS REMOVED, COVER THE DISTURBED AREA WITH TOP SOIL, FOR LOW SLOPES (LESS THAN 3:1) 5F- 1 . SILT FENCE CONSULT WITH DIFFERENCES ARE LOCAL NOTEDJURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHEN DRILL SEED AND CRIMP MULCH OR OTHERWISE STABILIZE IN A MANNER APPROVED BY THE LOCAL JURI4. INSPECT WEEKLY, DURING AND AFTER ANY STORM EVENT. DETAIL BASED ON DETAILS PROVIDED BY DOUGLAS COUNTY Urban Drainage and Figure C3-2 November 2010 Urban Drainage and Flood Control District SR-3 November 2010 Urban Drainage and Flood Control District SF-3 SF- Urban Drainage and Flood Control District November 2010 Flood Control District g g g Drainage Criteria Manual (V.3) CONCRETE WASHOUT AREA Urban Storm Drainage Criteria Manual Volume 3 Urban Storm Drainage Criteria Manual Volume 3 Urban Storm Drainage Criteria Manual Volume 3 Z O STAKES SHOULD BE DRIVEN THROUGH THE STAKES SHOULD BE DRIVEN ACROSS FROM 4 •4 x� o o 4r�" 5-12" HDPE CULVERTS MIDDLE OF THE WATTLE. LEAVING 2 — 3 EACH OTHER AND ON EACH SIDE OF THE ` � ' • . �� `{ `• `< _ INCHES OF THE STAKE PROTRUDING ABOVE WATTLE. LEAVING 4"-6" OF STAKE / � �' �,, ` GENERAL NOTES Q Vii THE WATTLE. A HEAVY SEDIMENT LOAD WILL PROTRUDING ABOVE THE WATTLE. BAILING TEND TO PICK THE WATTLE UP AND COULD WIRE OR NYLON ROPE SHOULD BE TIED TO '- 1 . ALL STRUCTURES SHALL BE 4200 PSI COOT CLASS P CONCRETE. mmomm PULL IT OFF THE STAKES IF THEY ARE THE STAKES ACROSS THE WATTLE. STAKES A A DRIVEN DOWN TOO LOW. IT MAY BE OR SHOULD THEN BE DRIVEN UNTIL THE BAILING L D I 2. ALL CONCRETE WALLS SHALL BE 6" THICK MINIMUM. T T- ./;� �� T u V NECESSARY TO MAKE A HOLE IN THE : ilk �/_■�i /i WATTLE WITH A PICK END OF YOUR MADDOX WIRE OR NYLON ROPE IS SUFFICIENTLY SNUG I-- Z IN ORDER TO GET THE STAKE THROUGH THE TO THE WATTLE. PIPE FLARED— ND—SECTION TRICKLE/VALLEY PAN 3D MIN. 3. ALL EXPOSED CONCRETE CORNERS SHALL BE CHAMFERED V4 IN. W STRAW. WHEN STRAW WATTLES ARE USED \ . o' =Z� �`Z �`1 4. REINFORCING BARS SHALL BE EPDXY COATED AND DEFORMED #4, I■■■■�■■■■' FOR FLAT GROUND APPLICATIONS, DRIVE THE � ,♦� ♦ STAKES STRAIGHT DOWN; WHEN INSTALLING AND SHALL HAVE A MINIMUM 2" CLEARANCE FROM CONCRETE FACE. w 0 ', • `♦� � tn WATTLES ON SLOPES, DRIVE THE STAKES o . •• �o � • � • CUT OR BEND AROUND PIPES AS REQUIRED BY M & S STANDARD S 6 PERPENDICULAR TO THE SLOPE. t, t. ♦. ♦, , � .i PLAN NO. M-601-11 . I■■■■' * ,■■■� O.C.' .�1 I , , 5. TOP OF BOX SHALL REMAIN OPEN WITH NO TRASH RACK. M 6" BURIED RIPRAP 6. DETAIL NOT TO SCALE. I■■■■' ■■��■' V O A FLOW A (TYPICAL) • VARIES I■■■■ z ■■■■' 0 St OUTLET STRUCTURE TABLE O PLAN VIEW WITH TRICKLE/VALLEY PAN t 1 • t-POINT B 1 \ • ♦ • \ N.T.S. BOX DESC. ELEV. 1 ELEV. 2 ce V POINT A • ' POINT A ;I, , ♦ �•♦, 4A. * ;% ntas , OUTLET STRUCTURE 4797.43 4798.83 PLAN VIEW � ' /I /y.�♦/,,'♦ �.'� 6" HORIZONTAL SPACING W cc / ,, ',, 0♦, �! ! 8" PVC OR HOPE ORIFICE F. ) . • CE H . � ! A • . . illil A Z Z 1 2 - N Z VI vv • t D _ Ie ♦ Ie _ .I� _ .INS eOA LA OA_OA OA LA OA IDA CFLARED— ND—SECTION o� Vii•♦�i1♦�i•j�� •�-- 3D MIN. \ \ PLAN VIEW WATTLE /AKII ♦ 60e ELEVATION2 u (1O" MIN. DIA.) ��. �t, e"T, 3• POINT A POINT A • ° �o` - 6" / reap ♦s�♦., c , . �•. \•:.!. ,IYY• •/ •/ � •/ �L. �L. • I �Io/ IoI ELEVATION 2 — O.C. POINT B BURIED RIPRAP ^ ^ ///'''�� (TYPICAL) • VARIES • / \ 12^ HD E LVERYs \ / \ �/ ENTRENCH 3" 6- • / , 1 • �aaL POINTS A MUST BE HIGHER THAN POINT B O.C. PLAN VIEW 12" VERTICAL SPACING 12 I I 12" SECTION A- A N.T.S. O.C. / 1 0C 3 5-12" HDPE 8" DIA. ORIFICE OUTLET PIPES I I WATTLE DIKE • BURIED RIPRAP O INV. IN 79743 I 1 .5 x d5O DEPTH INV. OUT=4797.33 ` I DITCH INSTALLATION • • ' • ' • "D ) D TRICKLE/OR VALLEY PAN Low • IRECTIsN ELE ANN U OR • PIPE 1 FLARED-END-SECTION DETENTION POND � �� III \ • • • MAINTENANCE NOTES: axi --__- 8" PVC OR HOPE ORIFICE 1. THE CONTRACTOR SHALL INSPECT DIKES EVERY TWO WEEKS AND AFTER SIGNIFICANT STORM (FILENAME: EVENTS AND MAKE REPAIRS OR CLEAN OUT UPSTREAM SEDIMENT AS NECESSARY. SIDE VIEW ` 0005 .0007. 00_RSR USR 2. SEDIMENT ACCUMULATED UPSTREAM OF DIKES SHALL BE REMOVED WHEN THE UPSTREAM , - l ., ' /.'. - 4 5 We_,'.'.-44 Y 6" HORIZONTAL SPACING FRONT VIEW SEDIMENT REACHES 1 /2 OF THE DESIGN DEPTH. - - " - - - 3. DIKES ARE TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA IS STABILIZED AND DESIGNED: GRASS COVER IS ACCEPTED BY THE TOWN. SECTION VIEW A-A DAH 4. WHEN REINFORCED ROCK BERMS ARE REMOVED, ANY DISTURBED AREA SHALL BE SEEDED, N.T.S. BEDDING MATERIAL I CRIMPED AND MULCHED OR OTHERWISE STABIUZED IN A MANNER ACCEPTED BY THE TOWN. 4" MINIMUM DEPTH <CHECKED: STRAW WATTLE DIKE DETAIL RIPRAP DETAIL OUTLET STRUCTURE DETAIL DAH / <JOB NO.: 0005 .0007. 00 ( I I (-SCALE HORIZONTAL: N /A VERTICAL: N /A 9 <DATE: JUNE 26 , 2015 SHEET NO. : 3 OF 3 414 1 COLORADO CIVIL GROUP, INC. (! TRISTATE Generation and Transmission Association, Inc. A Touchstone Energy`Cooperative ....._ projEctn SouthweSt wel dEx ansio p ii s •N killitr 0 0 — . . ,. a • • • . • fr Pi . , ii.r.. ... ., 4 kJ . . S r - Y • -'1.110c .11 0 ' 44 r r Ill Ill ti . 'L . ( „ri. . , ...„ . ► la r v; r' r *1 F `� ` fir` 1 • L. it<••r , I• - ' 0 ` O n 4 I .� .ia - •dr �' �'M �� 4 _ ! 11l. I 111 _ IT IS. .. FA; Di It .o, i .. — F ' •F 1 Iw •� . ./ i • .. _ • i 0 C • i _. a t, Ulf y i4 fro h1/4406:IL • IP idi f•� 1‘:‘ ifillt, a: / - r 4 st'; it t . - till 1 rit .thi ,, . . , .� ,�i .'"_. : ��}� IL lc�+ X14_ - a 140i ,10 4 t- sir i • p . •TiN ... .. ,r . ... _A _ , i, tail - „ • , . ... •* I It el _ `, ', rte_ ail _.sr. ; r • - lidillii : r"be _, \ It;iik • ,r0 rale be - a "--- 4 or i•w 40. lit - Pt _- t 1 t. _ \ e, . lr c • i :Ncitt ids _nir .e " "41 * 4. Oft ' 'MN Utiffirlivi? U.11 Rs t .64 7�= D/y tit. r k 401 � i ‘rt.. il • PRePaRed By: '� TETRA TE . ,. _ �, .. - __ 1 tr ansmission routing study May 2014 Southwest Weld Expansion Project Transmission Routing Study Contents Page 1 . Introduction 1 1 . 1 Purpose and Need 1 1 .2 Project Components 1 1 .2. 1 New Substations 2 1 .2.2 Substation Modifications 5 1 .2.3 Transmission Lines 6 2. Route Selection Process 8 2. 1 Existing ROWs and Opportunities for Collocation 8 2.2 Definition of Study Area 9 2.3 Data Collection and Resource Mapping 9 2.3. 1 Land Use 10 2.3.2 Jurisdiction 18 2.3.3 Water Resources 18 2.3.4 Biological Resources 19 2.3.5 Socioeconomic and Community Resources 22 2.3.6 Cultural Resources 22 2.3.7 Aesthetics 22 2.4 Field Reconnaissance 23 2.4. 1 January 16, 2014 23 2.4.2 March 6 and 7, 2014 23 2.5 Routing Objectives 24 3. Identification of Route Alternatives 25 3. 1 J.M. Shafer Substation to Greenhouse Substation Alternatives 25 3.2 Greenhouse Substation to Henry Lake Substation Alternatives 26 3.2. 1 Route 1 26 3.2.2 Alternative Routes 26 3.2.3 Considered but Eliminated 27 3.2.4 Comparative Analysis 27 3.3 Greenhouse Substation to Davis Tap 28 3.3. 1 Route 1 28 3.3.2 Alternative 28 3.3.3 Considered but Eliminated 29 3.3.4 Comparative Matrix 29 3.4 Davis Substation to Wheeler Lake Substation 29 3.4. 1 Route 1 30 3.4.2 Alternative Routes 30 3.4.3 Considered but Eliminated 31 3.4.4 Comparative Analysis 31 May 2014 i Southwest Weld Expansion Project Transmission Routing Study 3.5 Wheeler Lake Substation to the Firestone Trail Tap 32 3.5. 1 Route 1 32 3.5.2 Alternative Routes 33 3.5.3 Considered but Eliminated 33 3.5.4 Comparative Matrix 33 3.6 Greenhouse Substation to Colfer Substation 34 3.6. 1 Route 1 34 3.6.2 Alternative Routes 35 3.6.3 Considered but Eliminated 35 3.6.4 Comparative Analysis 35 3.7 Colfer Substation to Rattlesnake Ridge Substation 36 3.7. 1 Route 1 36 3.7.2 Alternatives 37 3.7.3 Considered but Eliminated 37 3.7.4 Comparative Analysis 38 3.8 Rattlesnake Ridge Substation to Neres Canal Substation 38 3.8. 1 Route 1 38 3.8.2 Alternatives 39 3.8.3 Considered but Eliminated 40 3.8.4 Comparative Analysis 40 3.9 Neres Canal Substation to South Kersey Substation 41 3.9. 1 Route 1 41 3.9.2 Alternatives 42 3.9.3 Considered but Eliminated 42 3.9.4 Comparative Analysis 43 4. Summary and Next Steps 43 5. References 45 Appendices Appendix A: Resource Maps Appendix B: Preliminary Route Segments Appendix C: Alternative Routes Appendix D: Sheet Maps Appendix E: Comparative Matrix ii May 2014 Southwest Weld Expansion Project Transmission Routing Study Tables Table 2-1 : Appendix A Figure List 9 Table 2-2: Airports in Project Area 17 Table 2-3: Federal Special Status Species 20 Table 2-4: State Special Status Species 20 Table 2-5: Routing Objectives 24 Table 3-1 : Greenhouse to Henry Lake Comparative Data 27 Table 3-2: Greenhouse to Davis Tap Comparative Data 29 Table 3-3: Davis Tap to Wheeler Lake Comparative Data 32 Table 3-4: Wheeler Lake to Firestone Trail Tap Comparative Data 34 Table 3-5: Greenhouse to Colfer Comparative Data 36 Table 3-6: Colfer to Rattlesnake Ridge Comparative Data 38 Table 3-7: Rattlesnake Ridge to Neres Canal Comparative Data 41 Table 3-8: Neres Canal to South Kersey Comparative Data 43 Figures Figure 1 : Project Area 3 Figure 2: Route Selection Process 8 Figure 3: Project Study Area 11 May 2014 iii Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. iv May 2014 Southwest Weld Expansion Project Transmission Routing Study List of Acronyms and Abbreviations CNHP Colorado Natural Heritage Program FAA Federal Aviation Administration GIS Geographic Information System kV Kilovolt NRHP National Register of Historic Places NWI National Wetlands Inventory PCA Potential Conservation Area Project Southwest Weld Expansion Project PD Planned Unit Development PVREA Poudre Valley Rural Electric Association ROW Right-of-Way Tri-State Tri-State Generation and Transmission Association, Inc. USFWS U .S. Fish and Wildlife Service May 2014 v Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. vi May 2014 Southwest Weld Expansion Project Transmission Routing Study 1 . Introduction Tri-State Generation and Transmission Association , Inc. (Tri-State) is analyzing the Southwest Weld Expansion Project (Project) for potential transmission line routes to interconnect five new substations to three existing substations in southwestern Weld County, Colorado, to serve facilities proposed to be built by Anadarko Petroleum Corporation and DPC Midstream Partners for Tri-State's member cooperatives, United Power and Poudre Valley Rural Electric Association , Inc. (PVREA). Tri-State is a wholesale electric power supplier owned by the 44 electric cooperatives that it serves. Tri-State generates and transmits electricity to its member systems throughout a 200,000-square-mile service territory across Colorado, Nebraska, New Mexico, and Wyoming. Tri-State owns, operates, and maintains an extensive transmission system in these four states consisting of more than 5,300 miles of transmission lines, 135 substations, and switchyards. United Power is a rural electric cooperative, providing electric service to homes and businesses throughout Colorado's northern Front Range. The service territory extends from the foothills to Brighton , Hudson, and Keenesburg . United Power is governed by a member- elected board of directors who direct the operations of the cooperative and oversee needed rate changes. PVREA is a distribution cooperative owned by the members that it serves. PVREA covers 2,000 square miles of service territory in Larimer, Weld, and Boulder counties and more than 3,600 miles of overhead, underground and transmission line combine, serving approximately 35,000 consumers. PVREA is governed by a member-elected board of directors. 1 . 1 Purpose and Need The Project is needed to serve facilities proposed to be built by Anadarko Petroleum Corporation and DPC Midstream Partners for Tri-State's member cooperatives, United Power and PVREA. The need for the overall improvement Project is to ensure that United Power and PVREA can continue to reliably supply electricity to its customers given the rapid increase in oil and gas development occurring in the region. Additional infrastructure is required both for Tri-State to supply more wholesale electricity to United Power and PVREA and for the members to distribute this electricity to their customers. 1 .2 Project Components The proposed Project consists of the following components: Five new substations to be sited and permitted : Greenhouse (Tri-State), Wheeler Lake (Anadarko), Colfer (Anadarko), Rattlesnake Ridge (Anadarko), Neres Canal (DCP Midstream ) May 2014 1 Southwest Weld Expansion Project Transmission Routing Study Modifications to three existing Tri-State substations: Davis, Henry Lake, South Kersey Less than 1 mile of new single-circuit 230-kilovolt (kV) transmission line between the existing J . M . Shafer Station and the new Greenhouse Substation Approximately 7 miles of new single-circuit 23OkV transmission line between the new Greenhouse Substation and the existing Henry Lake Substation Approximately 16 miles of new single-circuit 115kV transmission line connecting the new Greenhouse Substation with the existing Davis Tap, new Wheeler Lake Substation , and the Firestone Trail Tap along the existing Rinn Valley—Del Camino transmission line Approximately 9 miles of new 23OkV transmission line (initially operated with one circuit at 115kV) between the new Greenhouse Substation and the new Colfer Substation . Approximately 7 miles of new 23OkV transmission line (initially operated with one circuit at 115kV) between the new Colfer Substation and the new Rattlesnake Ridge Substation Approximately 5.5 miles of new 23OkV transmission line (initially operated with one circuit at 115kV) between the new Rattlesnake Ridge Substation and the new Neres Canal Substation Approximately 5.5 miles of new 115kV transmission line between the new Neres Canal Substation and the existing South Kersey Substation This Project would originate at the proposed Greenhouse Substation and radiate out to the substation interconnection points. Routes would be presented and studied on a segmented basis between Greenhouse Substation and each of the interconnection points. The Project area and proposed interconnection points are shown on Figure 1 . 1. 2. 1 New Substations Five new substations are proposed as part of the Project. New substations were sited primarily by Anadarko and DCP Midstream based on property ownership and oil and gas facility configuration. Substation siting is not addressed by this routing study. 1 .2.1 .1 Greenhouse Substation The proposed Greenhouse Substation would be located southeast of the existing J .M . Shafer Generation facility in an area that previously contained multiple greenhouse buildings and that is currently owned by Tri-State. This location was selected because of its proximity to the generation station and the availability of Tri-State-owned property. 2 May 2014 • I l l ji I � _ Project Area 1. N .•— LARIMER COUNTY . Milliken V ?b- to Salle Loner CR•50 WELD COUNTY I Evans-i'llz Lathan; • cn Legend f h `� a! in U a IP (:) • LJJ .� _ I ' - - - - ate CR 46 New Substation Johnstown �I� �i , Existing Electric Transmission IPirrand Generation I CR46 I - CR46 O (Digitized from NAIP 2013 Aerial) Baron I Lakece / �, 8 Substation Lake -- V n I / " J Generation Facility ''. nr- ce ei Nero-, ^ • v I / 34.5kV Transmission Line 1..1� CR42 Sut stat.un CR42 • t CR 42 • Gilcrest / ' • • 115kV Transmission Line N - r`, I a Berthoud • I ``\ • CR 401 • / CR 40 CR40 CR 40 • 230kV Transmission Line / • 230kV Double-Circuit Transmission Line Z �, Mead ` / rn .._.._l OR-38 I 1 / M 0 x • 230kV/115kV Double-Circuit Transmission Line w ) • i I / _ U U O Z N / U cr / !J CR 36 CR 36 • II / V n lI N �allMilmaallia It*. CR-34 L� I 1!ilrorr & ` I I L V I I 'MEEK a Reservoir MM ce a Z Luke — 1� a o rhrrmns F ' I' ADAMS AV CR=32 I ,/ Et Ali I 1/»lli,urr 'r Q M — - - — I 9p 'Reservoir _ V Cl i Rattlesnake 4 _= vDS Substation i over a.. li Culhius ',Alf), IIL.Tr I ill: , CR28 Luke' 1 l 4: e tiett tt t ruin 1 I`L �`` L -\ CR 26 I :Longmont Firestone _II a. I ' ` I .- IL �� II, _ - 119— - - - - ., -r• FIRES° ONE=BD �� _ ) (jta r t�if�r ,� al l: li ce 25 ,c-z- r I , Ili) t•pL,eti CR-22 co �� ` - , cc Ila mil di Z _ a' _ l II - 20 - : • CR 20 IIIIII �aa Z Substation T `�'Ce CR-18 76 rr - - YCg calI `o Frederick 9 1 111 y ��"ata� rs --- al:M -- CR16 I E ® Ill— Shafer green o�use rd—, . rE_Il j SuE>stationI 9 c _ i� dell!.ce,rr IN CR1a • 0 1 .5 3 — — — — — — — — — I — — — — i ; 76 v /_urd I I I I II • sitackfma. IFort,lupton,. — I� Miles - v Rescr,uu ■■ff�� - - Revised: 5/22/2014 • 1 • ca ®� I f� \ — I Path: P:W929 SW_Weld_ExpansIonlGlSlLayouts\RoutingStudyProject Area.mxd _ V 0411la �� ( 0, .alt.a..... .at J.Irs =, t, -e- -"E •, ul ..� 25 Hudson.cv80 ar, MiliMilli E trt JJ I I re n a tor t�1 G, �� a at a� a� ass a aim Dainam a a I-\ I' re 18 uv allelin 1� 1 _w. U v • CR 10 — -v - J- ; -,: co ZIP- M 85 h ■ , Weld County n ,n F—::: Erie I� ` \` - , Z: Oa , LEON=A=Wt1RL==PY — M • CR 8 (, =8 ce . O Q U co U • : • aL 25 —I L—-. I & i6 I J W CR=6 — �o e mot_—�, GR 6 d. CR 6 Iin —. it a�i__a� r�I�a Its aa. : __ a�is as -� V l S.: aat aat aat S S A .� —CRr4 Lochbuie CR 4 • /'rrspee'r , 70 , 70 II Keu rrroir O Broomfield 168TH•AV••— 168TH=AV •�- o° I ..- -- -.._..-.._..-.._. ._.. -•• •• ...— TRI-STATE ) ,,,„, . r, , i,— WE COUNTY_ NE RD I Horse Creek v Cala ar%ant tranami •or kW r / / \ I .Mc y jTho1nton 1 : �,-arn Brighton DAMS. COUNTY Reservoir �,}} Figure 1 : Project Area Southwest Weld Expansion Project Transmission Routing Study 1 .2.1 .2 Wheeler Lake Substation The proposed Wheeler Lake Substation would be constructed on property acquired by Anadarko for construction of the Mead Compressor Station . Wheeler Lake Substation would be located east of Wheeler Lake, south of Weld County Road 28, and west of Weld County Road 21 .5 on previously irrigated agricultural property. 1 .2.1 .3 Coffer Substation The proposed Colfer Substation would be located near United Power's existing Hudson Substation and Anadarko's Hudson Compressor Station north of 35th Avenue west of Weld County Road 49. 1 .2.1 .4 Rattlesnake Ridge Substation The proposed Rattlesnake Ridge Substation would be located near Weld County Road 49 and Weld County Road 30. United Power plans to build two new 69kV transmission lines out of the proposed Rattlesnake Ridge Substation. 1 .2.1 .5 Neres Canal Substation The proposed Neres Canal Substation would be located in the vicinity of Weld County Roads 49 and 42. 1.2. 2 Substation Modifications Modifications to three substations and one transmission line tap are proposed as part of the Project. 1 .2.2.1 Davis Substation The existing Davis Substation is located adjacent and east of the existing Anadarko's Lancaster Plant off Weld County Road 22, just east of Weld County Road 31 . Tri-State proposes to expand the Davis Substation on the northern side of the property to accommodate the transmission interconnection . 1 .2.2.2 Henry Lake Substation The existing Henry Lake Substation is located at the intersection of Weld County Roads 4 and 33. This substation area is congested with transmission lines and pipelines entering and exiting the substation from the north. The substation would be modified to include additional equipment within the existing fence line in the northwestern corner where the proposed transmission line would interconnect. 1 .2.2.3 South Kersey Substation The South Kersey Substation is located at the intersection of Weld County Roads 50 and 51 . The substation is located adjacent to and south of DCP Midstream's Lucerne Plant. An 115kV transmission line is currently exiting this substation and heading north . May 2014 5 Southwest Weld Expansion Project Transmission Routing Study 1 .2.2.4 Firestone Trail Tap The existing Rinn Valley to Del Camino 115kV transmission line is partially located along the Firestone Trail. The proposed Wheeler Lake to Firestone Trail Tap transmission line would interconnect with the Rinn Valley to Del Camino transmission line at a point north of the underground—to-overhead transition structure located near the intersection of Weld County Roads 26 and 15. The existing pole at the location of the new Firestone Trail Tap would be reconfigured to accommodate the interconnection. 1. 2.3 Transmission Lines The entire Project comprises nine sections, each of which is described below. 1 .2.3.1 J . M . Shafer Generation Facility to Greenhouse Substation The proposed single-circuit 230kV transmission line between the existing J . M . Shafer Generation Facility and the proposed Greenhouse Substation would be approximately 0.25 mile. This area is located east of Weld County Road 31 and south of Weld County Road 16, also known as Barley Avenue in the city of Fort Lupton . The J . M . Shafer Generation Facility is located south of Barley Avenue and east of Weld County Road 31 . The proposed Greenhouse Substation site is located to the south and east of the J . M . Shafer Generation Facility. Both are located within the boundaries of the city of Fort Lupton . 1 .2.3.2 Greenhouse Substation to Davis Tap The proposed single-circuit 115kV transmission line between the proposed Greenhouse Substation and the existing Davis Tap would be approximately 5 miles. This section of the Project traverses lands within the city of Fort Lupton and Weld County to the existing Davis Tap structure located north of Weld County Road 18 and east of Weld County Road 31 . The proposed Greenhouse Substation site is located to the south of Barley Avenue and east of Weld County Road 31 . Several existing utility corridors are located near the proposed Greenhouse Substation area and it may be possible to parallel these corridors for the Greenhouse to Davis section of the Project. 1 .2.3.3 Davis Substation to Wheeler Lake Substation The proposed single-circuit 115kV transmission line between the existing Davis Substation and the proposed Wheeler Lake Substation would be approximately 10 miles. A route in this area would head north toward Platteville and have to cross the South Platte River, U .S. Highway 85, and the Union Pacific Rail Road. The Davis Substation is located north of Weld County Road 22 and east of Weld County Road 31 adjacent to an existing oil and gas facility. The proposed Wheeler Lake Substation is located southeast of Wheeler Lake, south of Weld County Road 28 and east of Weld County Road 21 . 1 .2.3.4 Wheeler Lake Substation to Firestone Trail Tap The proposed single-circuit 115kV transmission line between the proposed Wheeler Lake Substation and the Firestone Trail Tap would be approximately 5 miles. A route for this 6 May 2014 Southwest Weld Expansion Project Transmission Routing Study section of the project would have to cross the town of Firestone parcels, depending on final alignment. The proposed Wheeler Lake Substation is located southeast of Wheeler Lake, south of Weld County Road 28 and east of Weld County Road 21 . Two possible locations have been identified for the Firestone Trail Tap along the Firestone Trail ; the first is located on the Firestone Trail southwest of the intersection of Weld County Roads 15 and 26, the second is located on the northeastern side of this same intersection and along the Firestone Trail. 1 .2.3.5 Greenhouse to Henry Lake The proposed single-circuit 230kV transmission line route between the proposed Greenhouse Substation and the existing Henry Lake Substation would be approximately 6.5 miles. A route for this section of the project would have to traverse land that has an existing transmission and pipeline corridor oriented north-south from the Henry Lake Substation . The proposed Greenhouse Substation site is located to the south of Barley Avenue and east of Weld County Road 31 . The existing Henry Lake Substation is located on the northwestern side of the intersection of Weld County Roads 4 and 33. The Henry Lake Substation is located in the city of Brighton . 1 .2.3.6 Greenhouse to Coffer The proposed double-circuit 230kV transmission line between the proposed Greenhouse Substation and the proposed Colfer Substation would be approximately 10 miles. A route for this section of the project could parallel Public Service Company of Colorado's, dba Xcel Energy (Xcel Energy), existing Fort Lupton to Pawnee transmission line to the north before turning east where it parallels Xcel Energy's existing Fort Lupton to Hudson transmission line before it turns south to reach the proposed Colfer Substation. The proposed Greenhouse Substation site is located to the south of Barley Avenue and east of Weld County Road 31 . The proposed Colfer Substation site is located just north of the Hudson Correctional Facility and west of Weld County Road 49. The route passes the Platte Valley Airpark and occurs partially within the city of Fort Lupton as it exits the Greenhouse Substation . 1 .2.3.7 Colfer to Rattlesnake Ridge The proposed double-circuit 230kV transmission line route between the proposed Colfer Substation and the proposed Rattlesnake Ridge Substation would be approximately 9 miles and may parallel Weld County Road 49 for some length of the route. The proposed Colfer Substation is located near the Hudson Compressor Station and west of Weld County Road 49. The proposed Rattlesnake Ridge Substation would be located in the vicinity of Weld County Road 49 and Weld County Road 32. 1 .2.3.8 Rattlesnake Ridge to Neres Canal The proposed double-circuit 230kV transmission line between the proposed Rattlesnake Ridge Substation and the proposed Neres Canal Substation would be approximately 6 miles and parallels Weld County Road 49 for some length of the route. The proposed Rattlesnake Ridge Substation would be located in the vicinity of Weld County Road 49 and Weld County May 2014 7 Southwest Weld Expansion Project Transmission Routing Study Road 32. The proposed Neres Canal Substation would be located near the intersection of Weld County Roads 49 and 42. 1 .2.3.9 Neres Canal to South Kersey The proposed double-circuit 115kV transmission line between the proposed Neres Canal Substation and the existing South Kersey Substation would be approximately 5 to 10 miles, depending on final alignment and would be located in agricultural land and oil and gas extraction areas. The proposed Neres Canal Substation would be located near the intersection of Weld County Roads 49 and 42. The existing South Kersey Substation is located on the northwestern corner of the intersection of Weld County Roads 51 and 50. The proposed transmission line would have to pass by the Easton/Valley View airport. 2 . Route Selection Process Routing new transmission lines requires an open and comprehensive process that balances various factors including electric system planning ; economics; the natural, cultural , and environment; public involvement; regulatory requirements; land rights; and engineering. The route selection process for the Project was carried out by utilizing a multi-phase, multi-step approach as shown in Figure 2. Preliminary Route Route Comparison and Public Review and Route Identification Refinement Refinement STEP 1 . Define the project STEP 1 . Conduct a STEP 1 . Present routes to area based on required comparative analysis of the local government. interconnection points route segments and end-to- stakeholders and landowners end routes to obtain feedback STEP 2. Obtain resource data and conduct field STEP 2. Adjust or remove STEP 2. Identify a preferred reconnaissance route segments based on the route and a select number of results of the comparative feasible alternatives for STEP 3. Identify preliminary analysis permitting route segments L Figure 2: Route Selection Process 2. 1 Existing ROWs and Opportunities for Collocation There are several existing transmission line corridors within the Project area that may offer opportunity for collocation . North of the proposed Greenhouse Substation there are three existing transmission lines that run north and south : the Fort St. Vrain to Riverdale double circuit 230kV owned by Xcel Energy; the Fort St. Vrain to Green Valley single circuit 230kV; and the Vasquez to Fort Lupton 115kV. The Fort St. Vrain to Green Valley single circuit 230kV turns from the north and south corridor and runs east to west in the eastern portion of the Project area. There are two single circuit 230kV transmission lines owned by Xcel Energy 8 May 2014 Southwest Weld Expansion Project Transmission Routing Study that run east to west in the eastern portion of the Project area: The Fort Lupton to Pawnee 230kV; and the Fort St. Vrain to Green Valley single circuit 230kV. South of these two transmission lines there is a single circuit Xcel Energy owned Hudson to Fort Lupton 115kV transmission line. South of Fort Lupton between the proposed Greenhouse Substation and the existing Henry Lake Substation there are two transmission lines: the Fort St. Vrain to Riverdale double circuit 230kV owned by Xcel Energy; and the Platte Valley to Fort Lupton single circuit 115kV owned by Xcel Energy. Some of these existing corridors are constrained by surrounding residential and oil and gas infrastructure development but would be utilized to the extent possible during route identification to avoid creating new linear disturbances. 2.2 Definition of Study Area The study area was determined by the Project interconnection points and to allow adequate area to identify multiple routes between each for analysis. The study area is located in southwest Weld County, Colorado, located in the northeast part of the state. The southern boundary of the Project area is located north of the Weld-Adams county line, also marked by Baseline Road/East 168th Avenue. The southwestern boundary is Interstate 76 and the municipality of Hudson . The western boundary is roughly the town of Firestone and the Del Camino Substation location . The northern boundary is Colorado State Highway 66. The Project study area is shown on Figure 3. 2.3 Data Collection and Resource Mapping Publicly available data were obtained from multiple sources to identify resources within the Project area and to populate the comparative matrix that was used to calculate potential impacts as part of the alternatives analysis. Data were compiled in a geographic information system (GIS) database and mapped ; the resulting resource maps are included as Appendix A. The list of figures included in Appendix A are summarized in Table 2-1 , including the sources of the resource data. Some data were digitized from aerial imagery, such as residences. Table 2-1 : Appendix A Figure List Figure Figure Title Data Source Number Figure A-1 2013 Aerial NAIP (2013) Aerial Figure A-2 Jurisdiction CoMap (2011 ), State Land Board (2013), National Conservation Easement Database (2013) Figure A-3 Land Use/Land Cover Colorado Vegetation Mapping v8 Figure A-4 Zoning Weld County (2013) Figure A-5 Potential Conservation Areas Colorado Natural Heritage Program (2013) Figure A-6 Development Colorado Department of Education (2011 ), U.S. Census (2010), Weld County (2013) Figure A-7 Game Species Habitat Colorado Parks and Wildlife (2013) May 2014 9 Southwest Weld Expansion Project Transmission Routing Study Table 2-1 : Appendix A Figure List Figure Figure Title Data Source Number Figure A-8 Avian Species Habitat Colorado Parks and Wildlife (2013) Figure A-9 Transportation BTS and CDOT (2013) Figure A-10 Surface Water National Hydrography Dataset (2010), Playa Lakes Joint Venture (2010), National Wetland Inventory (2010) Figure A-11 Historic Places National Register of Historic Places updated through (2012) Figure A-12 Water Wells Colorado Division of Water Resources (2014) Figure A-13 Oil and Gas Wells Colorado Oil and Gas Conservation Commission (2013) Figure A-14 Mines Colorado Division of Reclamation Mining and Safety Figure A-15 Topography USGS Figure A-16 Slope Derived from USGS 10-meter DEM Figure A-17 Utilities Ventyx (2013), Tri-State (2013) Figure A-18 Communications Federal Communications Commission (2012) Figure A-19 Prime Farmland NRCS SSURGO (2006) Figure A-20 Soil Erodibility NRCS SSURGO (2006) 2.3. 1 Land Use Land use in the Project area is mostly agricultural uses with residential and oil and gas development. A high density subdivided residential development is located north of Lochbuie, in Fort Lupton , north of the J . M . Shaffer Generation Facility and the proposed Greenhouse Substation location. Areas of low density residential development are northeast of Fort Lupton, in the U .S. Highway 85 corridor and near Frederick. Pasture/hay is found throughout the Project area, row crops on the western and extreme northern ends of the. Some fields are maintained as small grains or fallow. Center pivots are present throughout the area; however, they are more densely populated on the eastern side of the Project area. Land use and land cover are shown on Figure A-3. Farmland of statewide importance is present in the Project area. Farmland of statewide importance includes those that are nearly prime farmland and that economically produce high yields of crops when treated and managed according to acceptable farming methods. Some may produce as high a yield as prime farmlands if conditions are favorable (NRCS 2014). Farmland of statewide performance is shown on Figure A-19. Farmland of local importance is present in the Project area. In some local areas, there is concern for certain additional farmlands for the production of food , feed, fiber, forage, and oilseed crops, even though these lands are not identified as having national or statewide importance. Where appropriate, these lands are to be identified by the local agency or agencies concerned (NRCS 2014). 10 May 2014 H �� I CR52 rl U \ '\ JtV ' y r - LARIMER COUNTY ig, r;,Milliken �01�1 V b ��■��I dill. 34 Legend Ilk.La Salle !-r ' 'r'�' 1 CR 50 `— .1 - WELD COUNTY — — •-- —"—' _ .. I `, Evans o�.3e - Lr„hur» i �; '1/4=4.1 r) Reservoir In IX 0 Ili Iii — — — — ,� t tv- _ v CR 48 ' Study Area Johnstown 1 I V CR 46 I / • CR 46 New Substation Nevato ii I I Existing Electric Transmission O Kuc»n ; LakeI Lo tahu O to to CR-4a—cc I and Generation —�— (Digitized from NAIP 2013 Aerial) r, / ^ `U I f85j 11 N-r-sCanal 1In — ` CR42 Su•s . i•n CRaz SubstationCLI I cR 42 Gilcrest j' 1 — ^I Generation Facility oNkL 1 U Berthoud I j 34.5kV Transmission Line I \`"� � CR 401 CR 40 CR 40 CR 40 1 I 115kV Transmission Line Z IM Mead I o, I ..—.._v v ) — CR 38 I M I 1 230kV Transmission Line CC LEJz ` cc x 0 cc ''� i " U 1 U • 230kV Double-Circuit Transmission Line O It CR 36 J I r CR36 • f U ! 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(iw q Au.; tr r.m^ m„•u' 41) In :Thornton 1 Brighton Knerrff oir L # • , I II i -_ Figure 3: Project Study Area Southwest Weld Expansion Project Transmission Routing Study Some areas are designated as prime farmland if drained and either protected from flooding or not frequently flooded during growing season , prime farmland if irrigated , and prime farmland if irrigated and the soil credibility is suitable for agriculture. Prime farmland is shown on Figure A-19. An organic diary operation , Aurora Organic Dairy Farm , is present located south of State Highway 66 and west of U .S. Highway 85 in the Project area. Per the U .S. Department of Agriculture, the Organic Foods Protection Act enacted under Title 21 of the 1990 Farm Bill , establishes uniform standards for organic foods. The presence of transmission lines are not recognized as a concern for organic certification (Midwest Energy News 2013). Another dairy operation is located along Weld County Highway 55, between Weld County Roads 48 and 50. Several egg and poultry farms are located in the Project area. The Sparebow Egg Farm is located northwest of Hudson . The Project area generally has low to moderate erodible soils. Areas of highly erodible soils are present near the Del Camino Substation and northwest of Hudson . Soil erodibility for the Project area is shown on Figure A-20. Several active mines or quarries are present in the Project area, located west of the U .S. Highway 85 corridor and north of Firestone. One additional active mine or quarry is located at the intersection of Weld County Roads 12 and 35, north of Lochbuie. Mines present in the Project area are shown on A-14. A portion of the Firestone Trail is located in the Project area. This section of the trail is not paved and the formally designated trail ends at Weld County Road 26 (Traillink 2014). The trail is an old train track bed more than 12 miles long. It connects a variety of neighborhood and regional parks, the Saint Vrain Legacy Trail, and the Colorado Front Range Trail (Firestone 2013). The formally designated trail stops at Weld County Road 26, but the old railroad bed continues in a northeasterly direction toward Greeley. 2.3.1 .1 Land Cover The Project area land that is not used for agriculture is predominantly classified as mid to tall grass prairie with some areas of short grass prairie. Some areas are classified as shrub/scrub, land, mostly in the western side of the Project area. Some areas are classified by the Colorado Vegetation Mapping dataset as riparian grasses surrounding the South Platte River and the Saint Vrain Creek. Land use and land cover are shown on Figure A-3. Vegetation in the Project area is a mix of agricultural cover, grasses, and riparian plants in areas surrounding surface water. The western part of the Project area covers the riparian corridors of the Saint Vrain Creek and the South Platte River. The river corridors have riparian shrubs and sub-alpine/meadow riparian grasses, but are directly surrounded by cultivated pasture, hay, and row crops. The western part of the Project area that is not a riparian corridor is cultivated land with areas of mid to tall grass prairie and short grass prairie. Noxious and invasive weeds were observed during the field observation trips. Much of May 2014 13 Southwest Weld Expansion Project Transmission Routing Study this area deals with weed issues and Weld County has implemented a spraying , mowing , and reseeding program to help control growth (Weld County 2014b). The eastern part of the Project area is cultivated crop and center pivot irrigation , although in areas not irrigated, mid to tall grass prairie is the predominant vegetation cover. Vegetation cover is shown on Figure A-3. 2.3.1 .2 Weld County Comprehensive Plan The majority of the Project area is zoned as Zone A—Agricultural, with several areas zoned as Zone PD—Planned Unit Development (PD), near Lochbuie and Firestone. In addition, one small area south of Fort Lupton is zoned as Zone R-1 —Low Density Residential, while another area surrounded by the municipality of Fort Lupton is zoned as Zone C-3—Business Commercial. Two parcels north of the Del Camino Substation are zoned as Zone R-5—Mobile Home Residential. Zoning is shown on Figure A-4. Per the Weld County Code, the Agricultural Zone District is established to maintain and promote agriculture as an essential feature of Weld County. The Agricultural Zone District is intended to provide areas for the conduct of agricultural activities and activities related to agriculture and agricultural production without the interference of other incompatible land uses (Weld County 2008). The PD District is established to encourage flexibility and variety in the development of land to promote its most appropriate use, improve the design , character and quality of new development, facilitate the adequate and economical provision of public and private services, preserve the natural and scenic features of the development area, encourage an integrated planning approach, and ensure compatibility with the Weld County Code (Weld County 2008). The purpose of the R-1 Zone District is to provide areas in the county for single-family residential use that are located , designed , and developed in compliance with the Weld County Code and adopted master plans of affected municipalities (Weld County 2008). The purpose of the C-3 Zone District is to establish and preserve areas for activities that provide goods or services for the benefit of the general public or which require large amounts of space or high traffic volumes for generating business. The C-3 Zone District is to be located, designed , and operated in a manner that minimizes the undesirable impacts on the area in which they are located (Weld County 2008). The purpose of the R-5 Zone District is to provide areas in the county for mobile homes used for single-family residential occupancy. These areas are intended to be located, designed, and developed in compliance with the Weld County Code and the master plans of affected municipalities. 14 May 2014 Southwest Weld Expansion Project Transmission Routing Study The Weld County Comprehensive Plan , Chapter 22 of the Weld County Code, serves as the foundation of all land use and development regulations in the county (Weld County 2008). Per Chapter 23 Article 3 of the Weld County Code, utility service facilities are a use by right in the A (Agricultural) Zone District, the R- 1 Zone District, the C-3 Zone District, and the R-5 Zone District. A site plan review may be required if the proposed Project crosses the PD- zoned land because as utility service facilities are not considered a use by right. 2.3.1 .3 Development Southwestern Weld County is experiencing a boom in development due to oil and gas extraction activities. Oil and gas development is discussed in detail in Section 2.3. 1 .7. Oil and gas wells are shown on Figure A-13. Weld County's population is rapidly expanding and was one of the fastest growing counties in the nation during the past decade, with an average annual growth rate of 3.7 percent, twice the statewide average (Upstate Colorado Economic Development 2014b). Residential areas are located within the entire Project area, with the largest concentrations being within municipalities such as Lochbuie, Brighton , Fort Lupton, and Firestone and in subdivided county land. Subdivided land is located mainly around municipalities, although some subdivided land is located in unincorporated Weld County. The densest areas of subdivisions in unincorporated Weld County occur north of Fort Lupton. Many rural residences are located in the Project area, especially in the northern Project area south of the South Kersey Substation , south of Fort Lupton and north of Brighton , and east of Frederick and Firestone. Fewer rural residences are located just north of the existing Davis Substation . Development is shown on the Figure A-6. 2.3.1 .4 Public Facilities Public facilities in the Project area include schools, hospitals, and parks. The public facilities are generally located near the population centers, and are therefore centered on Fort Lupton. Public facilities associated with other towns are located outside of the Project area. No hospitals are located in the Project area. No state parks are located in the Project area; several local parks are located within the municipal boundary of Fort Lupton. The following parks are within Fort Lupton : Lancaster Park, Cannery Park, Koshio Park, and Lone Pine Park. Several schools are located within Fort Lupton in the Project area: Fort Lupton High School, Aims Community College, Twombly Elementary School, and Fort Lupton Middle School. Public Facilities are shown on the Figure A-6. 2.3.1 .5 Utilities Water wells are abundant in the Project area and may be used for domestic water supply or as a water supply associated with oil and gas wells. Water wells are concentrated in the May 2014 15 Southwest Weld Expansion Project Transmission Routing Study southern part of the Project area, especially around municipalities, subdivisions, and the U .S. Highway 85 corridor. Many transmission lines are present in the Project area due in part to the energy requirements of consumers in Weld County. Distribution lines mainly follow county roads in the rural pads of the Project area. The existing transmission lines provide electricity to the various substations throughout the Project area and can be described generally by corridor. The area near the Henry Lake Substation is the most congested in the Project area. The north-south corridor between Henry Lake and the proposed Greenhouse Substation siting area has a double circuit 230kV and 115kV transmission lines. A double circuit 230kV/115kV transmission line runs east to west just north of the Henry Lake Substation . North of Fort Lupton, a transmission corridor that runs north-south along Weld County Road 31 that has double circuit 230kV and 115kV transmission lines with additional 115kV and 230kV transmission lines paralleling the corridor for some length . A 230kV transmission line also runs from the proposed Greenhouse Substation siting area to the Davis Substation, and another 115kV line runs south from the Davis Substation along the same corridor for some of its length . Two additional 230kV transmission lines run east-west north of Weld County Road 22—one originates at the Davis Substation while the other originates at the Fort Saint Vrain Substation north of the Project area boundary. Near Hudson, there is a substation and a 115kV transmission line going east and west from the substation along Weld County Road 18, and south of Weld County Road 20, respectively. Communications facilities are present throughout the Project area but more abundant near municipalities and utility facilities. Some of the communications towers have guy wires that are used to stabilize the towers. Because the towers represent a relatively small and noncontiguous tract of land , they can be avoided during the routing phase of the Project. Utilities are shown on Figure A-17. Communication towers are shown on Figure A-18. 2.3.1 .6 Transportation There are several small private airports located in the Project area (Table 2-2). Easton/Valley View Airport is located just south of the South Kersey Substation ; Beaugh field is located southeast of the South Kersey Substation ; the Platte Valley Airpark is located just west of Hudson; the Tonga Airport is located northwest of the Davis Substation ; and the Kaufman heliport is located east of Firestone. A Notice of Proposed Construction or Alteration (Form 7460- 1 ) must be submitted for structures over 200 feet tall or for structures fewer than 200 feet tall that extend into regulated air space near an airport or as otherwise required under 14 CFR 77 Subpart B, Section 77. 9. 16 May 2014 Southwest Weld Expansion Project Transmission Routing Study Table 2-2: Airports in Project Area Airport Name Private/Public Use Nearest Project Section Platte Valley Airpark Public Greenhouse Substation to Colfer Substation Tonga Private Davis Substation to Wheeler Lake Substation EastonWValley View Airport Public Neres Canal Substation to South Kersey Substation Beaugh Field Private Neres Canal Substation to South Kersey Substation Major highways and roads in the Project area include U .S. Highway 85, which runs in a north- south orientation bisecting the Project area. Colorado Highway 52 is also located in the Project area in an east-west orientation and bisects U .S. Highway 85 in Fort Lupton . Colorado Highway 66 forms the northern boundary of the Project area. Paved county roads in the Project area are oriented in a grid pattern typical of rural areas. In addition to the many paved roads, dirt county roads are present in the Project area. A Union Pacific Railroad is located in the Project area and parallels U .S. Highway 85.Transportation infrastructure is shown on Figure A-9. 2.3.1 .7 Oil and Gas Development Weld County is the second leading area in Colorado in the production of oil and gas (Weld County 2014a). Oil and gas activity has occurred for decades in Weld County, which is located in the Denver-Julesburg Basin and sits above the Wattenberg Field (Discover Weld 2014). It is estimated that there are 20,000 oil and gas wells in Weld County as of 2014 (Discover Weld 2014). In November 2011 , an announcement from Anadarko Petroleum Corporation stated that results from early drilling indicate that the company could produce the equivalent of 500 million to 1 .5 billion barrels of oil, natural gas liquids, and natural gas from a the Niobrara formation within the Wattenberg Field boundaries located in Weld County (Weld County 2013). Oil and gas wells are abundant throughout the Project area, although they are more prevalent in the northern part of the Project area. Dense oil and gas development is present throughout the Project area, with the exception of the area to the south of Colorado Highway 52 and within municipal boundaries. Oil and gas extraction companies use sound- and light-reducing walls around some oil well operations. These appear as two-story-tall temporary walls that screen operations from nearby residences. These temporary walls may also be constructed from hay bales. Many oil and gas wells operate 24 hours under some circumstances necessitating the mitigation measure. Figure A-13 shows oil and gas well locations and status. 2.3.1 .8 Pipelines Natural gas and oil pipelines are abundant in the Project area due to the prevalence of oil and gas development. In addition , there are many fiber optic and water pipelines throughout the May 2014 17 Southwest Weld Expansion Project Transmission Routing Study Project area. Smaller diameter pipelines generally parallel county roads and connect active producing oil and gas wells to collector and processing stations. Several larger pipelines in the utility corridor north of the Henry Lake Substation—at least five that run north-south through the Project area generally east of Weld County Road 33. There is an additional large pipeline located along Weld County Road 18 and west of Weld County Road 49. Accurate and complete mapping of gas pipeline locations was not readily available. During the routing and transmission line design phases, oil, gas, water, and fiber optic pipelines would be located to confirm accurate location, size, and right-of-way (ROW) width . A gas processing plant and receiving points are located adjacent and west of the Davis Substation ; a gas processing plant is adjacent and south of the Colfer Substation ; and several receiving points are located near the proposed Greenhouse siting area . Publicly available data for pipelines are shown on Figure A- 17. 2.3. 2 Jurisdiction The Project area is located in Weld County and parts of the municipalities of Hudson, Lochbuie, Brighton, Fort Lupton, Firestone, and Platteville. Within the Project area, there is land managed by the Colorado State Land Board located in Lochbuie, east of the proposed Greenhouse Substation, and in the northern part of the Project area south of South Kersey Substation . A parcel of land located south of Fort Lupton, just east of U .S. Highway 85 is owned by the Denver Water Board. This land appears to be used as a quarry. No federal lands, county-owned parcels, state parks, wildlife management areas, or school district- owned lands are present within the Project area. No known conservation easements are present in the Project area. The jurisdictions are shown on Figure A-2. 2. 3.3 Water Resources Several water features are present in the Project area including the South Platte River, Saint Vrain Creek, and numerous small reservoirs. 2.3.3.1 Surface Waters Surface waters occur infrequently in the Project area; agricultural land in the Project area is irrigated and has many reservoirs for farming . Surface waters in the Project area are located along the South Platte River, Saint Vrain Creek, Box Elder Creek and Reservoir, and the various reservoirs in the Project area. Many intermittent streams and irrigation ditches are present in the Project area. Several playa lakes may be present in the eastern portion of the Project area. These probable playas are associated with small reservoirs in the area. 18 May 2014 Southwest Weld Expansion Project Transmission Routing Study Transmission line structures can generally be placed outside of surface waters and the lines designed to span smaller open waters. Most surface waters within the Project area can likely be spanned by a transmission line. Surface waters are shown on Figure A-10. 2.3.3.2 Wetlands The best available wetland data were obtained from the U .S. Fish and Wildlife Service (USFWS) National Wetland Inventory (NWI ). NWI mapped wetlands in the Project area are located along the South Platte River and Saint Vrain Creek and are associated with the various reservoirs in the Project area. Wetlands are a protected resource under Section 404 of the Clean Water Act and transmission structures placed in wetlands constitute a permanent impact. Generally, wetlands and surface waters can be avoided through careful pole placement and spanning the transmission line across wetland areas. Wetlands are shown on Figure A-10. 2.3.3.3 Floodplains Digital Federal Emergency Management Agency (FEMA) floodplain data were not available for the Project area. Floodplain maps were available on the Weld County Department of Planning Services website and were reviewed as part of the data collection and mapping phase of routing . Floodplains surround waterbodies; in the Project area this includes the South Platte River, St. Vrain Creek, Box Elder Creek, and small reservoirs (Weld County, 2014c). Tri-State would consult with Weld County if construction of the Project is proposed to be within a floodplain regarding any required permitting processes. 2.3.4 Biological Resources The sections that follow describe the special status species, fish and wildlife resources, vegetation , and potential conservation areas in the Project area. 2.3.4.1 Special Status Species The Endangered Species Act of 1973 defines the term "critical habitat" for a threatened or endangered species as specific areas within the geographical area occupied by the listed species on which are found physical or biological features that are essential to the conservation of the species and that may require special management considerations or protection; and specific areas outside the geographical area that are occupied by the listed species that are essential for the conservation of the species. Development within designated critical habitat is evaluated on a case-by-case basis. Habitat assessments should be conducted prior to permitting to determine potential issues related to special status species. The following federal special status species shown in Table 2-3 occur within Weld County. Bald Eagle occurrences are discussed in the avian species section below. No critical habitat for special status species is present within the Project area (USFWS 2014b, 2014a). May 2014 19 Southwest Weld Expansion Project Transmission Routing Study Table 2-3: Federal Special Status Species Common Name Scientific Name Status Birds Whooping Crane Grus Americana Experimental Population, Non-Essential Bald Eagle Haliaeetus leucocephalus Recovery American Peregrine Falcon Falco peregrinus anatum Recovery Mexican spotted owl Strix occidentalis lucida Threatened Piping Plover Charadrius melodus Threatened Least tern Sterna antillarum Endangered Flowering Plants Colorado Butterfly plan t Gaura neomexicana var. coloradensis Threatened Ute ladies'-tresses Spiranthes diluvaialis Threatened Mammals Black-footed ferret Mustela nigripes Experimental Population, Non-Essential Preble's meadow jumping mouse Zapus hudsonius preblei Threatened Source: USFWS (2014a) Colorado State Statute 33 (CRS Ann . Section 33-2 to 102-106) directs the Colorado Department of Parks and Wildlife to keep a list of threatened and endangered species for the state. The following state special status species shown in Table 2-4 occur within Weld County. Table 2-4: State Special Status Species Common Name Scientific Name Status Birds Ferruginous Hawk Buteo regalis Special Concern Mountain Plover Charadrius montanus Special Concern Long-billed Curlew Numenius americanus Special Concern Bald Eagle Haliaeetus leucocephalus State Threatened Mammals Black-tailed Prairie Dog Cynomys ludovicianus Special Concern Swift Fox Vulpes yelox Special Concern Black-footed Ferret Mustela nigripes State Endangered Meadow Jumping Mouse Zapus hudsonius preblei State Threatened Mollusks Cylindrical Papershell Anodontoides ferussacianus Special Concern Fish Northern Redbelly Dace Chrosomus eos State Endangered Source: CNHP (2013) 20 May 2014 Southwest Weld Expansion Project Transmission Routing Study 2.3.4.2 Fish and Wildlife Resources The sections that follow describe game, avian , and fish species habitat in the Project area. 2.3.4.2. 1 Game Species Habitat Game species that have habitat in the Project area include wild turkey, white-tailed deer, and mule deer. Most of these species habitats occur in the South Platte River and Saint Vrain Creek riparian areas. Wild turkey have winter range and winter concentration areas in the South Platte River west of U .S. Highway 85 and east of Firestone, and the Saint Vrain Creek riparian areas northeast of Firestone and overlapping the existing Del Camino Substation . White-tailed deer have winter range and concentration areas within the riparian corridor surrounding the South Platte River and Saint Vrain Creek. Mule deer have migration corridors along the South Platte River riparian corridor, and have severe winter range along the riparian corridor surrounding the South Platte River and Saint Vrain Creek. Game species habitat areas shown on Figure A-7. 2.3.4.2.2 Avian Species Habitat Avian species that have habitat in the Project area include Great Blue Heron and Bald Eagle. The Great Blue Heron has foraging areas located in the South Platte River and Saint Vrain Creek riparian areas. The Bald Eagle has nest sites located along Weld County Road 37 east of the proposed Greenhouse Substation location and east of the existing Davis Substation. Bald Eagle roost sites are also located along the South Platte River and Weld County Road 22and at Milton and Lower Lathum reservoirs, which are located just outside of the Project area near the South Kersey Substation . Bald Eagle winter concentration areas are located in the South Platte River and Saint Vrain Creek riparian areas. Avian species habitat areas are shown on Figure A-8. 2.3.4.2.3 Fish Species Habitat No data were available for fish species habitat within the Project area. No special status fishes occur in Weld County. 2.3.4.3 Potential Conservation Areas The area surrounding the South Platte River through the Project area is designated as a potential conservation area (PCA) by the Colorado Natural Heritage Program (CNHP). The CNHP tracks and ranks Colorado's rare and imperiled species and habitat and provides scientific information and expertise to promote the conservation of Colorado's wealth of biological resources (CNHP 2013). Potential conservation areas were identified as such due to their biodiversity significance. No federal or state regulations prohibit the placement of transmission lines within PCAs, but they are considered to be sensitive areas because they may be utilized for conservation purposes. Data for PCAs within Colorado were obtained from the CHNP and are shown on Figure A-5. May 2014 21 Southwest Weld Expansion Project Transmission Routing Study 2.3.5 Socioeconomic and Community Resources Weld County's majors industries are oil and gas exploration and production , agriculture, manufacturing , and renewable energy (Upstate Colorado Economic Development 2014a). Oil and gas development is discussed in Section 2.3. 1 .7. Weld County leads the state in the production of sugar beets, grains, and beef cattle. The county is also a leader in the production of dry beans, potatoes, poultry and eggs, milk, and other dairy products (Discover Weld 2014). The county is consistently one of the top 10 economically producing agricultural counties in the entire United States (Weld County 2008). Weld County has a strong manufacturing sector, and many of the manufacturing businesses are agriculture related . No wind farms are located in the Project area. A large Vestas wind turbine blade and nacelle manufacturing plant is located at Weld County Road 8 and Denver Avenue, south of Fort Lupton . The plant is located adjacent to the Union Pacific Railroad to facilitate moving products to other destinations. According to U .S. Census Data, the 2012 population of Weld County was 263,691 . Weld County experienced a 4.3 percent growth between April 2010 and July 2013 (U .S. Census Bureau 2014). 2.3. 6 Cultural Resources Two historic places in the Project area are listed on the National Register of Historic Places (NRHP): Fort Vasquez and the Ottesen Grain Company Feed Mill. The Fort Vasquez Trading Post was constructed in 1835 and was the first permanent structure located along the South Platte River (History Colorado 2014). Traders used the fort for trade with Cheyenne and Arapahoe tribes. The fort was abandoned in 1842 and in the 1930s the Platteville community spearheaded an effort to reconstruct the adobe outpost with assistance from Weld County and the federal Works Progress Administration . The fort underwent a restoration in 2005. The fort was added to the NRHP in 1970 (#70000169).The fort complex now serves as a museum with permanent exhibits, Cheyenne tipi, store, information center, and a roadside marker that makes up the complex. The Ottesen Grain Company Feed Mill (#98001320) is another NRHP-listed site in the Project area. The site is located in Fort Lupton at the intersection of 7th Street and Main Street. The Ottesen Grain Company Feed Mill was added to the NRHP in 1998, and now operates as a restaurant (GoHistoric.com 2014). Historic places are shown on Figure A-11 . 2. 3. 7 Aesthetics Weld County is generally flat with slopes between 0 and 10 percent in the majority of the Project area. There are some areas with steeper slopes, but these are located along the riparian corridors of the South Platte River, Saint Vrain Creek, and Box Elder Creek. 22 May 2014 Southwest Weld Expansion Project Transmission Routing Study Sensitive receptors could include rural residences, subdivisions, and municipalities. There are substantial vistas of the foothills and Rocky Mountains from Weld County. Homebuilders typically orient views from homes west toward the mountains. However, there are many existing industrial visual elements from the substantial oil and gas and development (well heads, drilling equipment and collector stations) and many transmission lines and substations in the area. 2.4 Field Reconnaissance Three field reconnaissance trips were conducted by Tetra Tech in the Project area on January, 16; March, 6; and March 7, 2014. Tri-State staff has completed additional field trips and meetings with stakeholders and agencies that supplemented the information gathered by Tetra Tech. 2.4. 1 January 16, 2014 Tetra Tech conducted an initial field reconnaissance trip on January 16, 2014. During this trip the routing team obtained visual confirmation of the resources that were mapped for routing . The first leg of the field reconnaissance took place between the town of Hudson and the South Kersey Substation, located along Weld County roads 47, 49, 50, 51 , and 53. Generally, this area is developed with oil and gas extraction infrastructure, water pipelines, electrical transmission and distribution , center-pivot irrigation, gas pipelines, above-ground gas pipeline valves, buried fiber optic cables, residences, and other outbuildings. The second leg of the field reconnaissance took place in the southern part of the Project area between Hudson and the Adams-Weld county line (Baseline Road/168th Avenue) and north to the Henry Lake Substation . Similar to the first area that was visited, this area is developed with oil and gas extraction infrastructure, water pipelines, electrical transmission and distribution , center-pivot irrigation, gas pipelines, aboveground gas pipeline valves, buried fiber optic cables, residences, and other outbuildings. The third leg of the field reconnaissance trip included the areas north and west of Fort Lupton, the areas east and west of U .S. Highway 85, and the Davis and Del Camino substations. This area has several rivers and water reservoirs. The South Platte and Saint Vrain rivers are oriented north to south in this area. Many small reservoirs in the area are used to supply water for residential, agricultural , and industrial uses. In particular, there are many center-pivot irrigation operations and ditches in this part of the Project area. 2.4. 2 March 6 and 7, 2014 Tri-State and Tetra Tech conducted a second field reconnaissance trip on March 6 and 7 to explore preliminary routes that were identified after the initial field reconnaissance. During this trip, the routing team reviewed the preliminary routes to identify any additional constraints and/or route modifications. The team also reviewed an area that was added to the Project area after the initial reconnaissance trip. This area is located to the south and east of the May 2014 23 Southwest Weld Expansion Project Transmission Routing Study South Kersey Substation and provided space for additional route alternatives a further distance from the Easton/Valley View Airport and Beaugh Field . The first day of field reconnaissance took place on the eastern side of the Project area between the existing South Kersey Substation, the proposed Neres Canal Substation , the proposed Rattlesnake Ridge Substation , the proposed Colfer Substation , the proposed Greenhouse Substation and south to the existing Henry Lake Substation. The second day of field reconnaissance took place between on the western side of the Project area between the proposed Greenhouse Substation, the existing Davis Tap location , the existing Davis Substation , the proposed Wheeler Lake Substation , and the existing Firestone Trail Tap location . During this field reconnaissance, the routing team identified new oil and gas facilities that were recently built or are under construction , verified the location of residences, and identified pinch points where preliminary routes may need to be modified . 2.5 Routing Objectives The routing objectives for the Project are summarized in Table 2-5. Table 2-5: Routing Objectives Land Use Objectives Avoid oil and gas flare and vent facilities by 75 feet for height clearance Avoid gas pipelines by 75 feet. Avoid gas and water wells by 200 feet Parallel existing transmission lines where possible, while maintaining appropriate clearance Minimize number of transmission line crossings Favor routing transmission line through areas with existing and future land uses that are compatible with transmission lines such as industrial, commercial, and agricultural land uses. Avoid areas with existing and future land uses that are not compatible such as residential developments and high density land use Where they exist and are not constrained by crowding, parallel existing linear corridors (roads and transmission lines) Avoid occupied structures and other buildings Avoid homes and buildings, and other industrial structures such as oil and gas wells, so that the ROW is kept clear of existing structures Avoid impacts to local airports, both private and public Transportation Objectives Favor paralleling existing state highways and county and local roads where possible Land Cover Objectives Transmission line spans are approximately 700 feet to 800 feet; therefore, avoid surface water or other land features such as ditches that are greater than 800 feet in width that cannot be spanned Minimize impacts to sensitive resources that exist in wetlands by spanning wetlands or routing around wetlands or through careful pole placement 24 May 2014 Southwest Weld Expansion Project Transmission Routing Study Table 2-5: Routing Objectives Existing Utility Infrastructure Objectives Assess feasibility of routing along existing transmission and distribution lines and existing pipelines Cultural and Historic Resources Objectives Avoid potential degradation of NRHP-listed sites by routing transmission line away from such sites Work with local county and municipalities to identify culturally sensitive landmarks or sites and avoid routing transmission line within these sites Biological Resources Objectives Reduce potential impacts to sensitive species habitat by identifying a Platte River crossing with existing disturbance (e.g., road or transmission line crossings) Minimize impacts to avian species by avoiding nesting areas 3 . Identification of Route Alternatives Preliminary route segments (Appendix B) were identified based upon location of proposed and existing substation endpoints, the initial field reconnaissance trip, review of available data and a desktop analysis. The route alternatives were reviewed by segment during the second round of field reconnaissance trips and refined based up on observed on-the-ground conditions. End-to-end route alternative routes for each section of the Project are shown in Appendix C. Detailed sheet maps are included as Appendix D. The segments were then combined and compared using a comparative matrix. A comparative matrix was populated with key resource data on route segments and end-to-end route combinations (for each substation-to-substation section of the Project area) were created using a GIS database. The comparative matrix also incorporated routing criteria including length following existing linear features, number of residences in proximity to route segments, length crossing specific types of land cover and land uses, biological resources, and cultural resources. Potential impacts to resources were quantified and compared on a segment and end-to-end basis for each of the criteria. The complete data matrix showing the comparison of end-to-end routes is provided in Appendix E. Based on data presented in the comparative matrix, segments were further modified , removed from consideration, or added for further review. Route 1 described in the sections below refers to the route that performed the best in the comparative matrix, and the alternatives represent additional routes to be carried forward in the permitting process. 3. 1 J . M . Shafer Substation to Greenhouse Substation Alternatives The J . M . Shafer Generation Facility Substation is located 1 ,500 feet to the northwest of the proposed site for the Greenhouse Substation. Alternative routes were not included in the comparative matrix for this section of the Project area. May 2014 25 Southwest Weld Expansion Project Transmission Routing Study 3.2 Greenhouse Substation to Henry Lake Substation Alternatives The preliminary routes for the proposed Greenhouse Substation to the Henry Lake Substation were identified along existing transmission lines and pipelines in the area as well as field lines. An existing utility corridor, which is located directly north of the Henry Lake Substation and going north toward Fort Lupton , presented an opportunity for routing , although a communication facility is located within the corridor and another transmission line running east-west that crosses the corridor. This route along the central utility corridor was adjusted slightly to accommodate separation to the communication facility and crossing of the existing transmission line. An additional route was identified to the west that makes use of less populated areas and field lines to proceed north to the proposed Greenhouse Substation site. The city of Fort Lupton has planned for a new road to the southeast of the proposed Greenhouse Substation site. The new road , oriented north-south , would be located between 9th Street and Colorado Highway 52. There may be an opportunity to parallel this future road with the proposed Greenhouse to Henry Lake segment of the Project; Tri-State would consult with the city of Fort Lupton to assess this opportunity. 3. 2. 1 Route 1 Route 1 makes use of the existing utility corridor between the Henry Lake Substation and the southern Fort Lupton area. At the proposed Greenhouse Substation site, Route 1 proceeds south and then east along the southern property line. The route parallels the southern property line, and then turns south approximately 0.4 mile east of Northrup Avenue and follows a road alignment proposed by Fort Lupton for approximately 0.5 mile to 9th Street/Weld County Road 14. The route then proceeds south mid-field toward Colorado Highway 52. The route continues south in this alignment and angles to the southeast toward the existing utilities corridor and continues south for approximately 4 miles toward the existing Henry Lake Substation . In the 4-mile length, the route angles out to the west to accommodate separation requirements for a 200-foot communications tower located just south of Weld County Road 6. After angling back to the east, the route continues south approximately and into the northwestern corner of the Henry Lake Substation site. 3.2. 2 Alternative Routes The Greenhouse Substation to Henry Lake Substation section of the Project has one end-to- end alternative (Alternative Route 2) and other segments that use parts from Route 1 , Alternative Route 2, and connector segments to create additional alternatives. Alternative Route 2 starts at the Greenhouse Substation and goes directly south out of the substation site, paralleling Weld County Road 31 for a short distance, and turns east to parallel the northern side of 9th Street/Weld County Road 14. Alternative Route 2 then turns south mid- field for approximately 2 miles. The route angles southeast to avoid a residence and outbuildings before continuing south for 0.8 mile. The route then turns west and parallels a property line for 0.3 mile before continuing south approximately 1 .5 miles mid-field. The route turns east to parallel the northern side of Weld County Road 4 and into the Henry Lake Substation from the western property line. 26 May 2014 Southwest Weld Expansion Project Transmission Routing Study Connector segment C7 is located in an east-west orientation approximately one section to the north of Weld County Road 6. This connector segment attaches the southern parts of Route 1 and Alternative Route 2. Connector segment C6 is located along 9th Street just south of the proposed Greenhouse Substation site and would allow either Route 1 or Alternative Route 2 to enter the site by two different approaches. Connector segment C3 is located to the west of Northrup Avenue and would provide additional options for either Route 1 or Alternative Route 2 to enter the proposed Greenhouse Substation site by two different approaches (either C3 or C1 ). Connector segment O11 is located along 91 Street, southeast of the proposed Greenhouse substation site. Segment O11 can be used to provide additional alternatives to connect into the eastern corridor of segments C6 and C9. 3. 2.3 Considered but Eliminated The possibility of identifying a route on the eastern side of the existing transmission line and pipeline utility corridor was explored in the preliminary phases of routing . A route in this area would have to cross the existing utility corridor twice and would be in closer proximity to an existing subdivision and was not explored further 3. 2.4 Comparative Analysis Seven end-to-end routes were analyzed in the comparative matrix. Route 1 , Alternative Route 2 and Alternative Route 3 were the top routes and generally follow the same alignment with slight variations. For the purpose of this analysis, three distinct route alternatives were chosen from the comparative matrix. Route 1 (segment combinations of C2, O10, C4, C6, and C9) has the shortest length and has the highest percentage of its length adjacent to existing linear features. Route 1 also has the fewest number of oil and gas wells within 200 feet of the centerline and the fewest number of center pivots within 75 feet of the centerline. Route 1 also has the fewest residences within 200 feet and 500 feet and the fewest number of parcels within the 150-foot ROW. Route 1 also has the fewest number of communications facilities within 200 feet of the centerline. Alternative Route 2 consists of segments O1 , C11 , C6, and C9. Alternative Route 3 consists of segments C9, C7, C5, and C1 . Segments are shown on maps in Appendix B and the three alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-1 . The full comparative matrix is included in Appendix E. Table 3-1 : Greenhouse to Henry Lake Comparative Data Alternative Alternative Comparative Criteria Route 1 Route 2 Route 3 Engineering Factors Overall length (miles) 6.18 6.25 6.21 Percent length adjacent to linear features—roads, rail, 60.28% 54.87% 18.29% transmission and distribution lines May 2014 27 Southwest Weld Expansion Project Transmission Routing Study Table 3-1 : Greenhouse to Henry Lake Comparative Data Alternative Alternative Comparative Criteria Route 1 Route 2 Route 3 Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 0 0 0 Jurisdiction/Land Use Factors Center pivots within 75 feet 0 0 1 Residences and Other Structures Residences within 75-200 feet of centerline 0 0 1 Total residences within 500 feet of centerline 0 2 4 Number of parcels within 75 feet of centerline 18 20 22 Number of communication facilities within 75-200 feet of 2 2 2 centerline 3.3 Greenhouse Substation to Davis Tap The area between the Greenhouse Substation site and the Davis Tap is heavily congested with existing gas pipelines, electric transmission line, subdivided residential, and oil and gas wells and facilities. Portions of the preliminary routes for the Greenhouse Substation to Davis Tap were identified along the existing Davis to Fort Lupton transmission line. An additional route segment was identified to the east that uses a less populated area away from the subdivision on the eastern side of Fort Lupton . Several other options along property lines may exist in this area. Tri-State would conduct further research into underground utilities and hold landowner meetings to determine feasibility and preference for routing in this area as alternatives to Route 1 described below. 3. 3. 1 Route 1 Route 1 begins at the proposed Greenhouse Substation site and heads due south for a short distance before turning east and heading across open field approximately 1 .5 miles before turning north and following existing oil and gas well access roads. Route 1 proceeds north for approximately 0.8 mile on the eastern side of Grant Street, adjacent to the existing transmission line, before making a slight jog to the east and back to the existing transmission alignment to avoid an oil and gas well facility. Route 1 proceeds an additional 0.9 mile north along the eastern side of Grant Street to the Davis Tap location . 3. 3. 2 Alternative Alternative Route 2 utilizes parts of Route 1 with slight variations. Instead of turning north along existing oil and gas well access roads to parallel the east side of Grant Street, Alternative Route 2 continues east for 0.5 mile before turning north along an existing gas well pipeline corridor and back to the east to rejoin the same alignment as Route 1 . Alternative Route 2 continues north for 0.8 mile before turning back to the west and rejoining Route 1 . 28 May 2014 Southwest Weld Expansion Project Transmission Routing Study 3.3.3 Considered but Eliminated No segments have been eliminated from consideration in the Greenhouse to Davis Tap section of the Project. 3.3.4 Comparative Matrix Two end-to-end routes were analyzed in the comparative matrix, and the Alternative Route 2 is made up of portions of Route 1 with slight variations. Route 1 (segment combinations of D1 , D2, D5, D6, and D7) is the shortest length and has the most percentage of its route adjacent to existing linear features. Route 1 also has the shortest length of the route in municipal land and the fewest parcels within 75 feet of the centerline. Neither route had any residences within 75 feet of the centerline. Both routes had one residence within 200 feet of the centerline. Alternative Route 2 consists of segments D1 , D2, D3, D4, D6, and D7. Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-2. The full comparative matrix is included in Appendix E. Table 3-2: Greenhouse to Davis Tap Comparative Data Comparative Criteria Route 1 Alternative Route 2 Engineering Factors Overall length (miles) 3.65 4.55 Percent length adjacent to linear features—roads, rail, transmission and distribution lines 63.94% 51 .23% Jurisdiction/Land Use Factors Length in municipal land (miles) 0.79 0.94 Residences and Other Structures Number of parcels within 75 feet of centerline 11 12 3.4 Davis Substation to Wheeler Lake Substation The preliminary routes from the existing Davis Substation to the proposed Wheeler Lake Substation were identified primarily along existing pipelines, roads, and field lines in the Project area. An existing natural gas pipeline corridor that runs directly north out of the Davis Substation presented an opportunity for routing . Alternatives were chosen along field lines to the south and paralleling U .S. Highway 85. Routes were developed along county roads and other linear facilities to cross U .S. Highway 85 and the South Platte River. Routes were also developed to avoid impacts to the private Tonga Airport located south of Weld County Road 26 and east of U .S. Highway 85. May 2014 29 Southwest Weld Expansion Project Transmission Routing Study 3.4. 1 Route 1 Route 1 (made up of segments B17, B15, B14, B13, B6, B5, and B1 ) begins at the existing Davis Substation off of Weld County Road 22 and east of Weld County Road 31 . Route 1 proceeds directly north out of the northeastern corner of the substation site and proceeds west across open field between existing oil and gas facilities. Route 1 proceeds north , paralleling an existing gas pipeline corridor, approximately 1 .5 miles to and turns west to parallel Weld County Road 26 for approximately 3.2 miles until it crosses U .S. Highway 85 and proceeds another 1 .5 mile west on the western side of U .S. Highway 85. Weld County Road ends at this point, but the route continues along the same westerly alignment to cross the South Platte River. After crossing the South Platte River, the route continues west along the same alignment before turning northwest and following the western side of a ditch and property/field lines to the proposed Wheeler Lake Substation site. 3.4. 2 Alternative Routes This section has two end-to-end route alternatives that share some common segments to create alternatives. Alternative Route 2 consists of segments B17, B16, B14, B12, B11 , B20, B19, B4, and B2, and is the northern alternative to Route 1 . Alternative Route 2 shares the first part of the route with Route 1 and begins at the existing Davis Substation off of Weld County Road 22 and east of Weld County Road 31 . Alternative Route 2 proceeds directly north out of the northeastern corner of the substation site and proceeds west and then north along the existing gas pipeline corridor until it joins up and follows the Route 1 alignment to Weld County Road 26. The route then proceeds north approximately 0.5 mile to and turns west to parallel the section line north of Weld County Road 26. Alternative Route 2 proceeds west along this section line for 2.5 miles. The route then jogs to the south and then west along property lines and a canal to avoid center pivot irrigation and continues west to the U .S. Highway 85 corridor. Alternative Route 2 parallels the U .S. Highway 85 corridor on the east side for approximately 0.4 mile. Alternative Route 2 crosses U .S. Highway 85 on the south side of Weld County Road 28. Alternative Route 2 then parallels Weld County Road 28 for approximately 2 miles to the west toward the proposed Wheeler Lake Substation site. The route crosses the road several times in this distance to accommodate residences, oil and gas wells, and other outbuildings along Weld County Road 28. At Weld County Road 21 '/2, Alternative Route 2 turns southwest and follows property lines into the proposed Wheeler Lake Substation site. Alternative Route 3 (made up of segments B7, B5, and B1 ) begins at the Davis Substation and proceeds south of the site and around the existing Anadarko facility to the south of the existing substation site. Alternative Route 3 turns west and follows a section line for approximately 3.5 miles due west to the U .S. Highway 85 corridor. This alignment makes a jog to avoid an oil and gas facility east of Weld County Road 31 . Alternative Route 3 then turns northwest along the eastern side of the Union Pacific Rail Road ROW and proceeds northwest along this alignment for 2.5 miles to Weld County Road 26. Alternative Route 3 then joins Route 1 at Weld County Road 26 and shares the same alignment to the west and 30 May 2014 Southwest Weld Expansion Project Transmission Routing Study across the South Platte River. After crossing the South Platte River, the route continues west along the same alignment for another 0.5 mile before turning northwest and following the western side of a ditch and property lines to the proposed Wheeler Lake Substation site. 3.4.3 Considered but Eliminated Segments B3, B18, B9, and B8, and B10 were eliminated after the preliminary comparative analysis. Segment B18 was originally located along Weld County Road 28 between Weld County Road 33 until it reaches segment B8, approximately 2.5 miles to west. Segment B8 was located in a north-south orientation connecting segments along Weld County Road 28 to segments to the south . Segment B8 was eliminated after the other segments along Weld County Road 28 and east of U .S. Highway 85 were eliminated from further consideration because a connector segment was no longer needed. Segment B18 was eliminated because two better alternatives were available to the south along Weld County Road 26 and along section lines that did not interfere with the Weld County Road 28. The areas surrounding Weld County Road 28 are very congested with development. Segment B9 was located going north of Weld County Road 26 and connecting to Alternative Route 2 to the north. This segment was no longer needed to create additional alternatives in the area. Segment B3 was located along an existing 35kV transmission line and connected segments to segments along Weld County Road 28. This segment was no longer needed to create additional alternatives in the area and was eliminated . 3.4.4 Comparative Analysis Ten end-to-end routes were analyzed in the comparative matrix. For the purpose of this analysis, three distinct route alternatives were chosen from the comparative matrix. All of the routes analyzed in the comparative matrix had very similar characteristics when quantified . Route 1 (segments B17, B15, B14, B13, B6, B5, and B1 ) ranks the second best in its proximity to oil and gas wells and residences, is the shortest route, but does not have the most percentage of its route adjacent to existing linear features. While the comparative matrix reports three oil and gas facilities within 200 feet for Route 1 , these can be avoided with detailed routing and , depending on the well owner and operator, a closer distance for the setback could be negotiated . Segments are shown on maps in Appendix B and the alternatives are shown on maps in Appendix C. Select data from the comparative matrix are included in Table 3-3. The full comparative matrix is included in Appendix E . May 2014 31 Southwest Weld Expansion Project Transmission Routing Study Table 3-3: Davis Tap to Wheeler Lake Comparative Data Alternative Alternative Comparative Criteria Route 1 Route 2 Route 3 Engineering Factors Overall length (miles) 8.99 9.39 9.49 Percent length adjacent to linear features—roads, rail, 65.74% 73.15% 49.12% transmission and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 3 2 6 Oil and gas other facilities within 200 feet 1 8 3 Water wells within 75 feet 2 2 5 Jurisdiction/Land Use Factors Center pivots within 75 feet 1 7 0 Distance to closest airport (private) (miles) 0.46 0.93 1 .13 Residences and Other Structures Total residences within 200 feet of centerline 5 7 2 Total residences within 500 feet of centerline 7 12 6 Number of parcels within 75 feet of centerline 36 48 48 Natural Resources Number of intermittent waterway crossings 1 2 2 Number of ditch crossings 10 10 9 3.5 Wheeler Lake Substation to the Firestone Trail Tap The preliminary routes for the proposed Wheeler Lake Substation to the Firestone Tap line were identified along existing roads and mid-field . Routes were identified to avoid populated and subdivided areas and town of Firestone municipal land . The alternative routes share some common segments. Two endpoints for this section of the Project are possible because the Firestone Trail Tap could be constructed at various locations along the existing 115kV transmission line depending on the final route identified . 3.5. 1 Route 1 Route 1 is made up of segments A11 , A3, A7, A6, A4, and Al . As Route 1 leaves the proposed substation site, it heads west along segment A11 , which is comment to all alternatives. Route 1 then follows field lines to the south for approximately 0.25 mile before turning west along section lines between Weld County Roads 26 and 28. Route 1 follows this section line approximately 2 miles to the west. Route 1 turns south and follows section line 0.5 mile to Weld County Road 17 and follows this road south for approximately 0.5 mile. Route 1 then turns west and follows field lines for approximately 1 .25 miles to a point along the Firestone Trail where it would tap into the existing transmission line. 32 May 2014 Southwest Weld Expansion Project Transmission Routing Study 3.5. 2 Alternative Routes Alternative Route 2 consists of segments All , A3, A2, and Al and is the most southern of the three alternatives. Alternative Route 2 shares the same initial segments with Route 1 (A11 and A3), which begins on the western side of the proposed Wheeler Lake Substation site and follows field lines to the south for approximately 0.25 mile to the south . Alternative Route 2 then continues south along the same alignment, following field lines for approximately 1 mile. This section of segment A2 has a slight jog to the east near Weld County Road 26 to avoid an existing substation. Approximately 0.5 mile south of Weld County Road 26, the Alternative Route 2 turns west and follows field lines for approximately 2 miles before rejoining the proposed route to a point along the Firestone Trail where it would tap into the existing transmission line. Alternative Route 3 consists of segment Al 1 , A9, and A8. Alternative Route 3 begins at the proposed Wheeler Lake Substation site and runs north along the western edge of the property line for approximately 0.5 mile before turning west and following Weld County Road 28. Alternative Route 3 follows Weld County Road 28 for approximately 2.3 miles to the west. The route follows the road around Wheeler Lake, on the southern side, and makes several other jogs along the 2.3 mile length to avoid residences and municipal land . At Weld County Road 17, Alterative Route 3 turns southwest to join the Firestone Trail corridor for approximately 1 mile to a point along the Firestone Trail where it taps into the existing transmission line. 3.5.3 Considered but Eliminated Two segments were eliminated from consideration on the Wheeler Lake to Firestone Trail Tap section of the Project. Segments A5 and A10 were eliminated because it was originally a connector segment that was not needed after the three alternative routes were identified . 3.5.4 Comparative Matrix Six end-to-end routes were analyzed in the comparative matrix and three were included in this analysis. Route 1 and Alternative Route 2 share some common segments. Route 1 (segment combinations of Al 1 , A3, A7, A6, A4, and Al ) is not the shortest length , nor does it have the most percentage of its route adjacent to existing linear features; however, Route 1 has the fewest oil and gas facilities within 75 feet and within 200 feet of the centerline. Route 1 also has the fewest residences with the ROW within 200 feet and within 500 feet of the centerline. Alternative Route 2 consists of segments All , A3, A2, and Al and Alternative Route 3 consists of segments All , A9, and A8. Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-4. The full comparative matrix is included in Appendix E. May 2014 33 Southwest Weld Expansion Project Transmission Routing Study Table 3-4: Wheeler Lake to Firestone Trail Tap Comparative Data Alternative Alternative Route 1 Route 2 Route 3 Engineering Factors Overall length (miles) 4.89 4.96 4.24 Number of road crossings 3 4 5 Length adjacent to roads (within 75 feet) (miles) 0.61 0.12 2.18 Percent length adjacent to linear features—roads, rail, transmission 41 .29% 64.82% 58.20% and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 75 feet 0 0 3 Oil and gas wells within 200 feet 2 2 7 Oil and gas other facilities within 75 feet 0 0 6 Oil and gas other facilities within 200 feet 4 5 16 Jurisdiction/Land Use Factors Center pivots within 75 feet 5 2 4 Length in municipal land (miles) 0.26 0.76 0 Residences and Other Structures Residences within 75 feet of centerline 0 0 1 Residences within 75-200 feet of centerline 1 2 6 Total residences within 200 feet of centerline 1 2 7 Total residences within 500 feet of centerline 3 9 13 3.6 Greenhouse Substation to Coffer Substation The preliminary routes for the existing Greenhouse Substation to the proposed Golfer Substation were identified along existing transmission lines, roads, and field lines in the area. An existing 115kV transmission line corridor running east-west presented an opportunity for routing. Alternatives were chosen along field lines to the north and paralleling Colorado Highway 52 to the south to provide alternatives that avoids Platte Valley Airpark, a public airport east of Fort Lupton. 3. 6. 1 Route 1 Route 1 consists of segments E1 , E2, E3, E4, E5, E6, E10, E13, and E14. Route 1 begins at the proposed Greenhouse Substation site and proceeds mid-field to the east approximately 1 .5 miles before it turns north and jogs east to Weld County Road 35. Route 1 then follows the existing 115kV transmission line approximately 5 miles to the east toward the proposed Colfer Substation site. This segment makes a jog near Weld County Road 39 to avoid a center pivot and residence and then continues east. Route 1 then turns south at an existing 34 May 2014 Southwest Weld Expansion Project Transmission Routing Study access road and goes south for approximately 0.4 mile before ending at the proposed Golfer Substation site. 3. 6. 2 Alternative Routes Alternative Route 2 consists of segments E1 , E2, E3, E4, E5, E7, E9, E12, and E14 and is the northernmost alternative of the three in this section of the Project. Alternative Route 2 shares segments E1 , E2, E3, E4, and E5 with Route 1 , but splits off and continues north 0.5 mile at the point where Route 1 turns east and parallels the existing transmission line. Alternative Route 2 continues north along property lines to Weld County Road 20 where it turns east and follows the road for approximately 5 miles. Segments E7 and E9 of Alternative Route 2, located along Weld County Road 20 jogs to the north and south across the road to avoid oil and gas facilities, residences, and other structures. Alternative Route 2 then turns south and follows property lines to the proposed Golfer Substation site. Alternative Route 3 (made up of segments El , E2, E11 , E13, and E14) is the southernmost of the three route alternatives in this section of the Project. Alternative Route 3 follows the same segments (El and E2) as the other two routes out of the proposed Greenhouse Substation site and east toward Weld County Road 35. Alternative Route 3 continues east 0.5 mile toward Weld County Road 35 where it turns south and follows the road for approximately 1 mile. Alternative Route 3 then turns east and follows Colorado Highway 52 for approximately 3.5 miles. The route then turns north and follows section lines approximately 0.5 mile to the east of Weld County Road 41 . Alternative Route 3 then goes north and northeast for approximately 3 miles to the existing transmission line corridor. Alternative Route 3 then shares segments E13 and E14 with Route 1 into the Colfer Substation . 3. 6.3 Considered but Eliminated Segment E8 was eliminated after the preliminary comparative analysis. Segment E8 was originally located along Weld County Road 39 and connected the middle route (Route 1 ) to the northernmost route (Alternative Route 2). Segment B11 was eliminated because it was no longer needed to create additional alternatives in the area. 3. 6.4 Comparative Analysis Five end-to-end routes were analyzed in the comparative matrix. For the purpose of this analysis, three distinct route alternatives were chosen from the comparative matrix. Route 1 was the shortest route and had the fewest oil and gas facilities within 200 feet of the centerline. Route 1 is the closest to Platte Valley Airpark, but because an existing transmission line is there, and based on input received from the owner of Platte Valley Airpark, it is anticipated that a successful Federal Aviation Administration (FAA) filing for the Project could be developed in this corridor. Route 1 also has the fewest residences within 75 to 200 feet of the centerline and within 500 feet of the centerline. None of these routes has any residences within the ROW . May 2014 35 Southwest Weld Expansion Project Transmission Routing Study Alternative Route 2 consists of segments El , E2, E3, E4, E5, E7, E9, E12, and E14. Alternative Route 3 consists of segments El , E2, E11 , E13, and E14. Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-5. The full comparative matrix is included in Appendix E. Table 3-5: Greenhouse to Colfer Comparative Data Alternative Alternative Route Route 1 Route 2 3 Engineering Factors Overall length (miles) 9.52 10.49 11 .03 Percent length adjacent to linear features—roads, rail, 80.71 % 78.58% 70.84% transmission and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 4 14 6 Jurisdiction/Land Use Factors Distance to closest airport (public) (miles) 1 .33 1 .89 1 .52 Residences and Other Structures Residences within 75-200 feet of centerline 0 2 7 Total residences within 500 feet of centerline 5 5 16 Natural Resources Length crossing wetlands (miles) 0.08 0 0.90 3.7 Colfer Substation to Rattlesnake Ridge Substation The preliminary routes for the proposed Colfer Substation to the proposed Rattlesnake Ridge Substation were identified along existing transmission lines, roads, and field lines in the area. This section of the Project has three alternative routes. The future land use of the Weld County Road 49 corridor is uncertain due to work associated with the Weld County Road 49 Corridor Improvements Plan. Safety improvements may result in the road being expanded ; however, final construction schedule and engineering details are still being worked out. Currently, Weld County Road 49 is very congested and not ideal for routing . 3. 7. 1 Route 1 Route 1 consists of segments Fl , F2, F4, F6, F7, and F15. Route 1 begins at the proposed Colfer Substation site and proceeds north along an existing access road for approximately 1 mile before turning east and following field lines for approximately 2 miles. Approximately 0.25 mile west of Weld County Road 49, Route 1 turns north and parallels an existing 115kV transmission line for approximately 1 mile and then , at Weld County Road 22, the route turns east and continues to parallel the existing transmission for transmission line another mile. At Weld County Road 51 , the route turns north and proceeds along the existing transmission 36 May 2014 Southwest Weld Expansion Project Transmission Routing Study line, existing access roads, and field lines for approximately 4 miles. The route then turns back to the west toward Weld County Road 49 and follows field lines for approximately 1 mile until it reaches Weld County Road 49. Route 1 then parallels the western side of Weld County Road 49 north for 0.5 mile into the proposed Rattlesnake Ridge Substation area. 3. 7. 2 Alternatives Three alternatives were developed for this section of the Project. The alternatives share common segments F1 , F2, and F15 and the same beginning and end of route. Alternative Route 2 consists of segments F1 , F2, F4, F5, F11 , F17, F18, and F15. The route begins at the proposed Colfer Substation site and proceeds north along an existing access road for approximately 1 mile before turning east and following field lines for approximately 1 mile. The route then turns north and follows section lines for approximately 3.6 miles, making a jog to avoid an oil and gas facility. The route then turns northeast to avoid a center pivot circle before continuing north for approximately 1 mile to Weld County Road 30. The route then turns east along Weld County Road 30 for approximately 0.5 mile and ends at the proposed Rattlesnake Ridge Substation area. Alternative Route 3 consists of segments F1 , F2, F3, F10, F13, F18, and F15. Alternative Route 3 begins at the proposed Colfer Substation site and proceeds north along an existing access road for approximately 1 mile before turning east and following field lines for approximately 0.5 mile. The route then turns to the north and proceeds north along an existing access road for approximately 1 . 1 miles past Weld County Road 22, and then turns northwest. The route proceeds northwest midfield for approximately 1 mile before turning west and then turning north to cross an existing transmission corridor. The route follows section and field lines for approximately 3 miles to the north to Weld County Road 30. The route then turns east and parallels Weld County Road 30 for approximately 2 miles, making two jogs across the road to avoid oil and gas facilities. The route reaches Weld County Road 49 and turns north to follow the western side of the road into the proposed Rattlesnake Ridge Substation area. 3. 7.3 Considered but Eliminated Four segments were considered but eliminated from further study. Segment F14 was eliminated after the preliminary comparative analysis. Segment F14 was originally located along field lines and existing access roads and connected the western route alternatives into the proposed Rattlesnake Ridge Substation site. Segment F14 was eliminated because it was no longer needed to create additional alternatives in the area. Segments F8 and F12 were located along Weld County Road 49 and were considered but eliminated because of uncertainty about the future expansion of the road and potential to develop a transmission line in the area. Segment F16 connected segments to the west of Weld County Road 49 to segments along Weld County Road 49. Since the segments along Weld County Road 49 were eliminated, connector segment F16 was not needed anymore. May 2014 37 Southwest Weld Expansion Project Transmission Routing Study 3. 7.4 Comparative Analysis Six end-to-end routes were analyzed in the comparative matrix. For the purpose of this analysis, three distinct route alternatives were chosen from the comparative matrix. Route 1 was not the shortest route, but it has the most adjacency to existing linear facilities, and it has the fewest oil and gas facilities and residences within 200 feet. Route 1 has the fewest residences within 500 feet of the centerline. None of these routes has any residences within the proposed ROW distance. Route 1 consists of segments F1 , F2, F4, F6, F7, and F15. Alternative Route 2 consists of segments Fl , F2, F4, F5, F11 , F17, F18, and F15. Alternative Route 3 consists of segments F1 , F2, F3, F10, F13, and F15. Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-6. The full comparative matrix is included in Appendix E. Table 3-6: Colfer to Rattlesnake Ridge Comparative Data Route 1 Alternative Route 2 Alternative Route 3 Engineering Factors Overall length (miles) 10.20 8.13 8.59 Percent length adjacent to linear feature—roads, rail, 71 .05% 58.55% 61 .19% transmission and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 0 5 1 Oil and gas other facilities within 75 feet 0 0 0 Oil and gas other facilities within 200 feet 4 2 7 Jurisdiction/Land Use Factors Center pivots within 75 feet 1 7 4 Residences and Other Structures Total residences within 200 feet of centerline 2 2 4 Total residences within 500 feet of centerline 3 3 11 3.8 Rattlesnake Ridge Substation to Neres Canal Substation The preliminary routes for the proposed Rattlesnake Ridge Substation to the proposed Neres Canal Substation were identified along existing roads and field lines in the area. This section of the Project has four alternatives. Weld County Road 49 is also located in this section of the project but is less congested in some areas than in the Colfer Substation to Rattlesnake Ridge Substation area. 3.8. 1 Route 1 Route 1 consists of segments G1 , G3, G5, G6, G10, and G14. Route 1 begins at the proposed Rattlesnake Ridge Substation site and proceeds north along the western side of 38 May 2014 Southwest Weld Expansion Project Transmission Routing Study Weld County Road 49 for approximately 0.5 mile. At the intersection of Weld County Roads 49 and 32, Route 1 angles to the northeast across open land for approximately 0.5 mile to the half section line. The route continues north along the half section line for approximately 0.75 mile and again angles for approximately 0.25 mile to the northeast to avoid oil and gas wells. The route continues straight north through open field for approximately 0.75 mile to Weld County Road 36. At Weld County Road 36, the route turns west and parallels the southern side of the road for approximately 0.5 mile to Weld County Road 49. At Weld County Road 49, the route turns north and parallels the eastern side of the road , crosses over to the western side to avoid a residence and oil and gas facilities and crosses back to the eastern side. The route continues north and crosses to the western side of the road again to avoid a residence on the eastern side of Weld County Road 49. The route continues on the western side of the road for approximately 1 .5 miles and makes a jog around oil and gas facilities north of Weld County Road 40. North of Weld County Road 40, the route crosses back to the eastern side of the road and continues north into the proposed Neres Canal Substation site. 3.8. 2 Alternatives Four distinct route alternatives were developed for this section of the Project because of uncertainty surrounding the future expansion of Weld County Road 49. The alternatives share segment G1 . Alternative Route 2 consists of segments G1 , G2, G6, G10, and G14. Alternative Route 2 shares much of the same alignment with Route 1 . Alternative Route 2 begins at the proposed Rattlesnake Ridge Substation area and proceeds north along the western side of Weld County Road 49 for approximately 5.5 miles. The route begins on the eastern side of the road and proceeds north for approximately 1 . 15 miles and crosses to the western side just south of Weld County Road 34 to avoid homes. The route continues on the western side of the road for approximately 0.9 mile and then crosses to the eastern side again to avoid oil and gas wells. The route parallels the eastern side of the road for approximately 0.8 mile, crosses over to the western side to avoid a residence and oil and gas facilities, and crosses back to the eastern side. The route continues north and crosses to the western side of the road again to avoid a residence on the eastern side of Weld County Road 49. The route continues on the western side of the road for approximately 1 .5 miles and makes a jog around oil and gas facilities north of Weld County Road 40. North of Weld County Road 40 the route crosses back to the eastern side of the road and continues north into the proposed Neres Canal Substation site. Alternative Route 3 consists of G1 , G3, G7, G11 , and G15. Alternative Route 3 shares some of the same segments with Route 1 . Alternative Route 3 begins at the proposed Rattlesnake Ridge Substation site and proceeds north along the western side of Weld County Road 49 for approximately 0.5 mile. At the intersection of Weld County Roads 49 and 32, Alternative Route 3 angles to the northeast across open land for approximately 0.5 mile to the half section line. The route continues north along the half section line for approximately 0.75 mile and again angles for approximately 0.25 mile to the northeast to avoid oil and gas wells. The May 2014 39 Southwest Weld Expansion Project Transmission Routing Study route continues straight north and northwest through open field for approximately 3.6 miles to avoid residences and oil and gas facilities. Just south of Weld County Road 42, the route turns west and northwest and continues into the proposed Neres Canal Substation site. Alternative Route 4 consists of segment G1 , G4, G12, and G15 and is the easternmost route. Alternative Route 4 begins at the proposed Rattlesnake Ridge Substation site and proceeds north along the western side of Weld County Road 49 for approximately 0.5 mile. The route turns east along the southern side of Weld County Road 32 for approximately 0.9 mile and turns north , crosses Weld County Road 51 , and parallels the eastern side of Weld County Road 51 for 0.3 mile. The route then angles to the northeast and continues to the east of Weld County Road 51 for approximately 0.5 mile to avoid a feed lot operation. At Weld County Road 34, where Weld County Road 51 ends, the route turns west and continues north . Alternative Route 4 continues north for approximately 3 miles and makes a jog to avoid a center-pivot circle. At Weld County Road 40, the route turns west for about 0.5 mile before turning north and continuing north and northwest through open field to the proposed Neres Canal Substation site. 3.8.3 Considered but Eliminated Segments G8 and G13 were originally connector segments between the western and central route alternatives. These two segments were eliminated after the preliminary comparative analysis. Segments G8 and G14 were eliminated because they were no longer needed to create additional alternatives in the area. 3. 8.4 Comparative Analysis Eight end-to-end routes were analyzed in the comparative matrix. For the purpose of this analysis, four distinct route alternatives were chosen from the comparative matrix. Route 1 is not the shortest, nor does it have the most adjacency. Route 1 has the fewest oil and gas wells within 200 feet and also has the fewest residences within 75-200 feet of the centerline and within 200 feet of the centerline and has the second fewest residences within 500 feet. None of these routes has any residences within the ROW. Route 1 consists of segments G1 , G3, G5, G6, G10, and G14. Alternative Route 2 consists of segments G1 , G2, G6, G10, and G14. Alternative Route 3 consists of segments G1 , G3, G7, G11 , and G15. Alternative Route 4 consists of segments G1 , G4, G12, and G15. Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-7. The full comparative matrix is included in Appendix E. 40 May 2014 Southwest Weld Expansion Project Transmission Routing Study Table 3-7: Rattlesnake Ridge to Neres Canal Comparative Data Alternative Alternative Alternative Route 1 Route 2 Route 3 Route 4 Engineering Factors Overall length (miles) 6.35 5.56 6.15 7.52 Percent length adjacent to linear features—roads, rail, 51 .38% 82.35% 8.59% 39.65% transmission and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 0 0 0 4 Oil and gas other facilities within 200 feet 7 5 2 7 Jurisdiction/Land Use Factors Center pivots within 75 feet 0 0 0 2 Residences and Other Structures Residences within 75-200 feet of centerline 0 3 0 2 Total residences within 200 feet of centerline 0 3 0 2 Total residences within 500 feet of centerline 12 20 11 14 3.9 Neres Canal Substation to South Kersey Substation The preliminary routes for the proposed Neres Canal Substation to the existing South Kersey Substation were identified along existing roads and field lines in the area. This section of the Project has three alternatives. The EastonNalley View Airport, which is located approximately 1 .5 miles from Weld County Road 51 , adds some uncertainty related to the analysis because of the FAA 7460-1 filing and approval process that would be required for a route near the airport. It is not clear whether the FAA would approve a route along Weld County Road 51 , so an alternative segment is discussed to the segment in this area. 3. 9. 1 Route 1 Route 1 consists of segments H1 , H3, H4, H15, H13, H18, H23, H24, and H21 . Route 1 begins at the proposed Neres Canal Substation site and goes northeast across Weld County Road 42 and back southeast toward the intersection of Weld County Road 51 and Weld County Road 42. The route was developed in this way to avoid a center pivot circle, residences, and oil and gas facilities. The route then turns north and parallels the western side of Weld County Road 51 for approximately 0.5 mile before crossing the road and paralleling the eastern side of the road for 0.3 mile to Weld County Road 44. Route 1 then parallels the northern side of Weld County Road 44 for approximately 0.5 mile and turns north to run along property lines for approximately 2 miles. The route turns west at Weld County Road 48 and parallels the northern side of the road for approximately 0.25 mile and then turns north and follows field lines for approximately 0.5 mile. The route then turns west again and follows a property line and goes mid-field for approximately 0.3 miles to Weld County Road 51 . The route parallels the eastern side of Weld County Road 51 for May 2014 41 Southwest Weld Expansion Project Transmission Routing Study approximately 0.5 mile, crosses Weld County Road 50 and proceeds northwest to the South Kersey Substation site. Segment H23 is located within 0.3 miles of a private airstrip called Beaugh Field . Tri-State will conduct landowner consultation to determine detailed routing in this area. 3. 9. 2 Alternatives Alternative Route 2 consists of segments H1 , H2, H12 , H2O, H24, and H21 . Alternative Route 2 goes north out of the proposed Neres Canal Substation site and continues north along Weld County Road 49 for approximately 1 mile, starting on the eastern side, crossing over to the western side to avoid oil and gas wells, and turns back to the road alignment to parallel the road on the western side to Weld County Road 44. At Weld County Road 44, the route turns to the east and parallels the southern side of the road , and then crosses and parallels the north side of the road to avoid oil and gas wells. Once the route reaches Weld County Road 48, it crosses the road and turns to the north . This route continues north along the eastern side of Weld County Road 51 for approximately 1 mile before crossing and paralleling the western side of the road for 1 mile. This route makes some jogs to avoid residences and oil and gas facilities. The route continues north along Weld County Road 51 from Weld County Road 44 to Weld County Road 50, approximately 3 miles. Alternative Route 3 consists of segments H1 , H3, H5, H7, H9, H14, H17, H19, and H21 and is the easternmost alternative that was created to maximize distance between the proposed transmission line and the Easton/Valley View Airport. Alternative Route 3 begins at the proposed Neres Canal Substation site and goes north and then east along Weld County Road 42. Route 3 goes northeast across Weld County Road 42 and back southeast toward the intersection of Weld County Road 51 and Weld County Road 42. The route was developed in this way to avoid a center pivot circle, residences, and oil and gas facilities. The route parallels Weld County Road 42 for approximately 3 mile until it reaches Weld County Road 55, where it turns north and proceeds for 0.25 mile and then turns east for another 0.25 mile and follows existing field lines. The route then turns to the north and continues along field lines for approximately 1 .75 miles with a jog around a center pivot circle. At Weld County Road 46, the route turns east and parallels the southern side of the road for approximately 0.25 mile before turning north again along existing field lines. The route continues north along this alignment for approximately 2 miles making two large jogs to the west to avoid oil and gas facilities. At Weld County Road 50, the route turns west and parallels the southern side of the road for 0.5 mile, crosses the road for 1 .0 mile and makes a jog to the south to avoid an oil and gas well. The route continues west and crosses back to the southern side of the road and , at Weld County Road 51 , it turns northwest to enter to existing South Kersey Substation. 3. 9.3 Considered but Eliminated Segments H6, H8, H10, H11 , H16, and H22 were originally connector segments between the eastern route and other route alternatives further to the west. These segments were eliminated after the preliminary comparative analysis because they were no longer needed to create additional alternatives in the area. 42 May 2014 Southwest Weld Expansion Project Transmission Routing Study 3.9.4 Comparative Analysis Eight end-to-end routes were analyzed in the comparative matrix. For the purpose of this analysis, three distinct route alternatives were chosen from the comparative matrix. Route 1 has the second shortest length ; however, as mentioned in Section 2.2. 1 .6, it may not be feasible due transmission structure height restrictions based on the proximity of the Easton/Valley View Airport. Route 1 and Alternative Route 2 have the fewest residences within 200 feet of the centerline, but Route 1 has fewer residences within 500 feet of the centerline. Route 1 consists of segments H1 , H3, H4, H15, H13, H18, H23, H24, and H21 . Alternative Route 2 consists of segments H1 , H2, H12, H2O, H24, and H21 . Alternative Route 3 consists of segments H1 , H3, H5, H7, H9, H14, H17, H19, and H21 . Segments are shown on maps in Appendix B and the alternatives are shown on maps Appendix C. Select data from the comparative matrix are included in Table 3-8. The full comparative matrix is included in Appendix E. Table 3-8: Neres Canal to South Kersey Comparative Data Route 1 Alternative Route 2 Alternative Route 3 Engineering Factors Overall length (miles) 6.17 5.41 10.37 Percent length adjacent to linear features—roads, rail, 39.18% 73.52% 45.82% transmission and distribution lines Oil and Gas and Industrial Factors Oil and gas wells within 200 feet 1 1 5 Oil and gas other facilities within 200 feet 9 15 18 Jurisdiction/Land Use Factors Center pivots within 75 feet 6 3 15 Distance to closest airport (public) (miles) 1 .67 1 .33 2 Residences and Other Structures Total residences within 200 feet of centerline 6 6 12 Total residences within 500 feet of centerline 17 22 36 4 . Summary and Next Steps This Routing Study documents the process used to develop route segments for the Project including : C Data collection and resource mapping ❑ Identification of routing objectives May 2014 43 Southwest Weld Expansion Project Transmission Routing Study Field reconnaissance Preliminary route identification Comparative analysis matrix Elimination of segments As reflected in the route identification section above, some routes that were designated as the top route in the comparative analysis were not the shortest in length nor did they have the most adjacency to existing linear features. In some areas, being adjacent to roads is not ideal due to existing residential and oil and gas development. Deviations around those areas or non-adjacent alternatives can result in additional length. Tri-State will choose a preferred route based on the results of the comparative matrix and other qualitative information such as future land use plans, and discussions with city and county planning departments and landowners. The next step in the routing process is to present the routes and obtain feedback from local government officials and the planning department within Weld County. This consultation would allow Tri-State to determine whether additional information that has not been captured in publically available documentation, such as road improvements, residential developments, rezoning , and presence of sensitive resources, should be considered . The proposed Project would require permits from Weld County, the city of Fort Lupton , the city of Brighton , and possibly the city of Firestone prior to construction . Consultation with local stakeholders would take place to determine comfort level with the routing options near the subdivisions, agriculture operations, and oil and gas facilities. Public outreach should be conducted for the residents in proximity to the route alternatives to determine any issues with the routes that Tri-State may not be aware of and to ensure the route development process is transparent. 44 May 2014 Southwest Weld Expansion Project Transmission Routing Study 5 . References CNHP (Colorado Natural Heritage Program ). 2013. CNHP Conservation Status Tracking Lists. Available Online: http://www.cnhp.colostate.edu/download/list.asp. Accessed April 25, 2014. Discover Weld . 2014. About Weld County. Available Online: www.discoverweld .com/aboutweldcounty.html. Accessed Jan . 22, 2014. Firestone, Town of. 2013. 2013 Financial Plan and Five Year Capital Improvement Program . Available Online: http://www.ci.firestone.co.us/DocumentCenter/View/154. Accessed Feb. 11 , 2013. GoHistoric.com , 2014. Ottensen Grain Company Feed Mill. Available Online: http://gohistoric.com/places/ottesen-grain-company-feed-mill-fort-lupton . Accessed Jan. 21 , 2014. History Colorado, 2014. History of the Fort. Available Online: www.historycolorado.org/museums/history-fort. Accessed Jan. 20, 2014. Midwest Energy News, 2013. "As a Power line moves in , and organic farm ponders its future. Available Online: http://www.midwestenergynews.com/2013/03/15/as-a-power-line- moves-in-an-organic-farm-ponders-its-future/. Accessed Jan. 28, 2014 NRCS (Natural Resources Conservation Service). 2014. Prime Farmland. Available Online: http://www. nres. usda.gov/wps/portal/nres/detail/ak/soils/surveys/?cid=nres142p2 035 988 Accessed Jan. 22, 2014. Traillink.com , 2014. Firestone Trail. Available Online: https://www.traillink.com/trail/firestone- trail.aspx. Accessed Feb. 11 , 2013. Upstate Colorado Economic Development. 2014a. Key Industry Sectors in Weld County. Available: http://www.upstatecolorado.orq/siteselection/keyindustrysectors-page.php Accessed Feb. 6, 2014. . 2014b. Why do Business in Weld County? Available Online: http://www. upstatecolorado.org/. Accessed Feb. 6, 2014. U .S. Census Bureau . 2014. State & County Quickfacts: Weld County. Available Online: http://quickfacts.census.gov/qfd/states/08/08123.html Accessed Feb. 7, 2014. USFWS (U .S. Fish and Wildlife Service). 2014a. Critical Habitat for Threatened & Endangered Species, Critical Habitat Mapper. Available Online: http://ecos.fws.gov/crithab/ Accessed May 13, 2014. May 2014 45 Southwest Weld Expansion Project Transmission Routing Study . 2014b. Weld County, Colorado Species Report. Available Online: http://ecos.fws.gov/tess public/countySearch !speciesByCountyReport.action?fips=08 123 Accessed Jan. 23, 2014. Weld County. 2014a. About Weld. Available Online: http://www.weldgov.com/AboutWeld/index.html Accessed Jan. 21 , 2014. . 2014b. Weld County Department of Public Works Department, Weed Management. Available at: http://www.co.weld .co.us/Departments/PublicWorks/Weed Management/ Accessed May, 13, 2014. . 2014c. Weld County FEMA Floodplain Maps. Available Online: http://www.co.weld.co. us/Departments/PlanningZoning/FloodplainManagement/FEM AFloodplainMaps.html Accessed May 21 , 2014. . 2013. 2013 Budget Plan. Available Online: http://www.co.weld.co.us/assets/7dCdAD190b06aDd902B8.pdf Accessed Jan. 23, 2014. . 2008. 2008 Weld County Comprehensive Plan . Available Online: http://colocode.com/weld/weldnoindex/weld 22 toc.pdf Accessed Jan. 22, 2014. 46 May 2014 Southwest Weld Expansion Project Transmission Routing Study Appendix A : Resource Maps Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. IPIPI Cit.- ,I or • • 81 ibis/ .' S.C.8 A ge 4a ik -'` w CR 52 S .�u • 'We lib'' t'`�-'{ • , 3 •ii '(�� tiVr - , ,� ---• S- -1. ♦. - -*s l -1 U., I / �' ..�'�iC t 2013 Aerial 9 c . .. ` `lf' i� Iv IP •veriaI .t14 'r•"' ■ I" 'P, Milliken '. �1 �� — _ - �.�.' �-' I I-).4 i t ' . A.-6:.I 66 . V. 1 . � 9 1 • ._.- • tt34t X•— 60 v — ilr v .4 i - { ��, ," I i i i y :at -- 'V' We * I t � c dGRg9 La Salle . — l.,w r �� ' Legend-� _ �f� j` •'r'S1�a `. , �' •' ' Evans #a `_., /.athant S N .-`i t.q7 . _•♦ fn��,,,�...,,,,,pt�., I6} ••1 e• ,(a, - I _ - rte'. a i 1 3iU1:(IP., �Y' "T--' !. I� •'tief� ,+ - .6%.: 257 _ • ± , - r ` - - }� 0' ' � ' i 1 r►'. �t - ______ �_as '� ARP r- r - ' �' r v. (q;103�--�' c 3Ql ' �' Study Area ,.. if. r. 4�j ~� _ so Die, WIPP r 04 4. 1 r •Thrill ! 4to;n 17 'rte aw, 9 er l • ,iiiitill• and Generationn .�, ill 4 1 , : � .. iii- Ni (Digitized from NAIP 2013 Aerial) N. .� Y ' , . , '.? '► �. 1 �� retk U 1 Substation �. U �. + I 85 r t i• v' Gtt t are* lit t' b • 'P •. 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I,: mod LII ' I r------I city — I Substation O. i \ 1 0 - - lover ' I I Conservation Easements I i i Re\CrcOil' ' r-arnino I • — --- 28 28 (National Conservation Easement Database, 2013) i .,lhr,;, - I 8,1' I Wheeler Mao I X 1,...c _ i ,a '-' -- 1 I Substation I Conservation Easement Leh ' l f . 1 Lt: I t� a l I — __ . L. CR26 ' L� ' . ' r- I _ � I — T I - 1• Fi�estorie � { `1 . , S L ► �� —5 1 1 - -I ' I ! I I r— I— 85 ' I St. Vrain I t r i y Longmont I = . State c I 70-i>. — ii . - � --A FIRESTONE-BD r•te , _Park,. SS _ • I ^f; I O �•.st•�- 4• , err, -�_ —.rl 25 _ t , / I i_ MI I — I --CR=22-DIM ' m) t lio w i ce ( I - - � � ►L CR20 W ii + CR 20 z r? 'L : I v 1 : : - ' Substatiot�Ifr U _l f - C R=18 i = -I CR•18ill - -y- i s 71 ' + ; I t i I 0 I - ;mag Ail 1 I 17 _ :.-fir I r I ' i i t /... 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' . � Fallow (84) � � � Fireslone — �� _ � C� �� . � ' � ec� �. lll ' _ Urban/ Rec Gresses (85) i' n Longmono '� _ _ - _ � Shrub - Ripafian (513) � . a -tis > - ��' FleE5TONE-Zq � p ' � � � � ` II � . � i III � 1 Shru6 - Eastem Sandhills Sagebrush (518) � �� JL 1 „,�'° Shm6 - Eastem Plains (519) � �� . � . 'k — _ � � � � � � Gress - Ri arian 713 P ( ) G� � �� ?� t eexa � ' .e ,:e l � ' � y :a� ' - �, , ; . ' �, � . � Gress - Shortgrass Prairie (714) ? L �• ' Grass - Mid/Tall Grass Prairie 715 m 'rl , + T .; — . . . 1e� � � - . ( ) \ p . t ' v � � ,: � � � � e - - n — tia=tsp._,)��- p r II� � � � §II II1I w ' I IlFred�O�- - li� ='h�,��.Cxti�CGLt�n,43 � ` - . V . caie 1�.;�'.._.IL . �_ . b�u � r � , �� ' � � � � � as ' � � ,rt., � � �� . � � . ; .. , . I � __ � ._ :,� .��_ � ,_5 3 � ��_" . �lL dli � � �+� � : ' .yi ., �Ha i I I I i ♦ _ �� r �y . 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M . �� ' .. � � � � � � � LocFbule � �� . ° � �� r i � I d' � l( I '4 .r,� � � � �w II — II .. _ _ —..— _ —.. _ .. _ - - -- — —.. _..— .. — — . _ _ —, R - ' Thom[on .�. .�. • �� __.' _ � .�. _ �� _ _ _ .�� nbl � N . . .. - .. � .._.._.._.._' ^ � . � � ___ ..__—�_ !i �' '_' � � Bri9nton �� • T . � T �t � � I�6i ',hAV — ' —• �l � — .. _ � _.._. _ > II,. . _ _ . -. . - .. . . - Figure A-3 : Land Use/Land Cover s . 1, ..� r ' CR 52 ,1 > 'i�d, , i t.0 r ' + ert N `r • Zoning i g `r ' - ` r I ... ksk, n t •r ? \ -AV I L/�RIMER COUNTY ..---- -� .' Ply _z �i 1 ll tixt 34S 1 i 1 I �J � � ., �,. 3I �y -;. Evans La Salle-� vv �d uN rY � ' ' "cR ll :a Legend 4 I is.'if , / 1t' \\ M Kr'cr'rrnlr _ E W . i - -arr.,-,,,c_ v= -- CR 4a L Study Area al Johnstown .., 1 1 \ New Substation I'. �+�. ' �`` M I I� _ Existing Electric Transmission CR as Milliken CR ' , O I \, ,,r,, r ,y+% and Generation I / /.,rGr L; N ' (Digitized from NAIP 2013 Aerial) + T :. II,° / lif rt j810 •r•s+ re ' 1 fCR42SU•St•tl_>.:! tri - ` .. •` CR 42 Gilcrest ' ., , • Zoning / , o (Weld County, 2013) fir I 70 �' 1 -% CR 40 �; CR 40 Y 'r CR-40 CR 40 q1 A: Agriculture '1>< _ MI Z I P� Mead Arlia...., i• n C-1: Neighborhood Commercial I-- -o - GR;38 _ I I 4 z ,�' ,/, Z.1‘64 t 1 N Uif, J ' C-2: General Commercial cD F. - .» • 0 Ti , • )1 1 C-3: Business Commercial Z CR 36` _ CR 36 ; . I.,.: & ` I _ o `' r� _ 111111 U c, .j • , 1 I C-4: Highway Commercial Is T GR=34 tlrla,,; I I E: Estate I linen vi. r- 0 ,�'= _ . '• it gel x 11 : Industrial1 '� r rte '• Y 1U I z -.in ., " 1 fru,r<r. 1I . ! I ADAMS AV ll - GR=32 I Pi ! 1-2: Industrial2 ' I!v , . t I 13: Industrial 3 Q Itt � �j - ,e Su•s .t • irm PUD: Planned Unit DevelopmentCI— LT ll 1 R-1: Low Density Residential 9 2o CR28 �( Wh I•r Lake I 1 R 2: Duplex Residential / \ Su•st.ti•n �t ��\ r • R-3: Medium-Density Residential in l I Firetone.�r �`1111S � , J i � CR 2s l (.85) I R-5: Mobile Home Residential Longmont ;� % FIRE TiON�E�B�D _ e I J I O i.e.- `�•T' z5 i41 • _ I,1% , i CR=22 � o ( I w ' CR 20 I la 1 _ Golfer I Z. i, �i Substation h �= 2y - 1 CR=183 _ ` CR•18 - I; Ucc �` �� ea- Hudson' �l ,?6 %K enesburg • OFrederick 1 �°--u , CR 16 I b n. n Ii d_IGr• =nh•us- (' " '1 j85 S •s .ti•n , • 1 r 0 1.5 3re, E�— it rz / CR 14 I I I IL Fort Lupton V—_ Miles Ulli __-- 52_c —� - Revised: 5/23/2014 ro „ �I 474 ! -�' Path: P:14929 SW_Weld_ExpansionlGIStayouts1Resource_MapslZoning.mxd II , 25 �:. --=L===- 1 WY 111 r so ' �1 I 180 80 NE V U ' _ U tr C R 10 c, I Dacono • : {1 1 ,n 1. . ] ' i' - U Z I } ,_ .r 85 _ Weld County I , i_ U 1 cc' •_ h 47 Z _ - LEON=A=WURL=PY - //// CR 8' - 1 — CR`8 �_ U Erie c cc W I _o 7 1 76 �' v I ' I I Ill W _.�r' _ _—h' 1JS,'_ I�6R=6 CR o 1 / v CR 6 ; � ~ y II 03I ----=-' ) if;E: Broomfield I L tryaa I .. - CR 4 I 4 ,C Lochbuie R 4 - I • .,mss K. In nV@r i O -- T�11�w�I �t �w.1•�:�1:� V"PI �' COUNTY . —...17:. /.i7)__-.•—••—••—•__.. —••—••—••—..—••--•— TRI-STATE — •—i7 — •a—Z— — -- ---�—••— — —••—••—••—••_168TH-AV •--�BASELINERD -•'�=�•----'----- •- -•-•_---------•- °' I COUNTY �# Ull J I Brighton Thornton Figure A-4: Zoning j J '•eeieeieiei''ieeeiei�'eies!ie� 1 ire;:' - CR52 .+e.ee.......e!'+.• Potential Conservation Areas - i ' ra++eeee+eee• .�.+ �+ Ir a z 7 ♦♦ N\LNs LARIMER COUNTY ., I / • , I ♦+++++i ++ � �++� . ' �+� a � 3 V �� ee Evans R a lei `La Salle e� I Kal CR:50 ,. WELD COUNTY I li 1�eeeeee+ee c 39 I L lhax. xi •eeeee♦ i .� ixrl,',`,,,ee• [Si. �, Legend t -771 � I ,;4� r I I eeeeee_-. `;Resemn,i. ce cc W h - 1 . _ ,..';eeeee; •�.b It o �A • CR 48 I L - Study Area I -.-eeeeee .., Johnstown �eeeeee� ' .�e�l�eeeeeee�eee�� New Substation vex eee- . . CR46 Milliken �eei�►eee CR46 Existing Electric Transmission •eee ►ee O �• - !! I I and Generation I r6e _ U — _In eeeee ' (Digitized from NAIP 2013 Aerial) I ' I ' eeee�l CR=44- I L1 - - - - - - - ., eeeee eeeee U r sreeee, Substation .... , ♦eeeee I 85 ,i :� ti v eeeeee Ners C-anal G # Berthoud �eeeeeeeeee� Su.st-ii•n f'4 � I�eeeee�� CR42 CR42 CR42 J Generation Facility ^ ++++e+i Gilcrest I ' Potential Conservation Areas CL. ,vwee:ee� • eeeee l i r' eel j — 0� (CO Natural Heritage Program, 2013) �e+,, eej cR ao cR ao cR ao ' cR ao I k.. a A Potential Conservation Area L �eee e�gee I ' z I m Mead "l" 11��e+ ee Z t ' U TI , O Z CR 36' _ CC Ir CR 36 ,�e�e e Udi/ & ' E; lee ►eee. 0 • p0 { ' I ' eeeee . 'NW' • - ►o; �eeeeeeeee� r tie* a CR-34 �� eeeee+ee�� A+e .V,lrr,n ♦' 0 1 e eeeee � V Keser�nir • al � +o++� .L,,I,e ♦eeee! Z llw,nu.s� a eeeee, �� eeeee ADAMS AV � �.eeeee � I CR=32 �♦+e+e+++� ' ee ♦eeeeee ►.►eee I . ,;r,lli ct,r ►•�!.� .e+eeeee+e®+. ',t �... I li , Q kr,el VII il - �e-e� I CI ►�e�e�es Substation L.L _ _ 66 lenr r„ n, 1 re o e+eeeel ,� Kc Xaorvaa ' ' iarnino eeeee I +•s•�`' . ,ieieeeie� CR 28 hi HI CrYt ' • • • Lake , eeeeeo' / \eI al,e Su•st.ti• e+e� ' 1. I1I ‘\ l , ;tir, � , Ii'l Ff: CR 26 w 1. �� Firestone ' ►e �♦ 8's 0ei ieiei �r ' —'�„Longmont - ,�, FIRESTONE=BD - a ee' f c I Nit Soo � � ' ee eee� i ►ieeei�. �, ...A. . ® +�eeeeeeee� I O : eeeee ii ►, 1 fee®®eeee� N �r -CR=22-� w +eeeeee. .eee� I mil ►teeeee�� 4 eeeeee z CR 20 I CR 20 W eeeee.� i- eeeee Colf-r ci • ;T i �'' Substation c-3 ��♦ewe CR 18 C R=18 I a a +•+e++'�� = " S =Keenesburg 0 �eeeeee� 0 Hudson I '�eee+eee�'� eeeee. �' Frederick +eoe+eo� J M ,I CR 16 �eee� Sh-f-r'G Greenhouse a�L ee��X85• ,_e`er ;ry r � � � ' 0 1 .5 3 CR14 9 _ _ _$f4FortLuPton ss• /cr ,e; roil- Miles N III Revised: 5/23/2014 :.�. 1 N en ��;• ' ,1� �`- �� '•.� Path: P:14929_SW_Weld_Expansion1GISlLayouts\Resource_Maps1PCAs.mxd - •eli - - - - -� - - z5 W r r� i ' i v U aglillig 18 s Iq t . l f '� ♦ \ • , {� ` eee'I \ I - -- - U rc CR 10 rr - 1. . Dacono I eeeeee � I cy to CO z + ee ' I Weld County LEON=A=WURL=PY = CR 8 CR=8 U • M U �: 2s 080/ e+e+e�r, a n 1 �_'=cc Erie �eeeeee�� w W I o �e+++e+e+y. z I _. __. 76Ill ��CR_6 �� o I CR 6 II. CR 6 i.�.0Ca IY Broomfield I arta I Pr'na,oc • _ CR 4 - — - - CR 4 Kr,rrnir76 70 i _ 70 ` >ee �� Lochbuie ' O I �rY,'.,e ______ �� WELD COUNTY ive!, _ TRI-STATE - 3) I - - - ----..-..-..-..-..-.. -. :� . --,_.-..-..-_--•.-.._.._ _..-.--•• - — ---- 168TH•AV— — BASELINE RD C J I - y Thollnton eee ADAMS COUNTY Key ;�„], OI r ►ee �/ Brighton Figure A-5: Potential Conservation Areas i7 • - - j�GR52 �t.v f. i+ • D i I \ , • Development mho i ma LARIMER COUNTY yy � �� NLN-43 V 601 1 Y l�' Evans 390.4 „ LaSalle /.uner s3° sue' �C1,50. ■ -�'= r' ' +1• WELD COUNTY cR clrrnlrn, an N >i Legend IL " .c-_ /' M //('$('7'1•!)11' ■ y ,z4 ■ °° 1 1 1 I' W , ti !,„ I „ Li •° ° a2I eRlaa.—t—f Mill Study Area al Johnstown = - 1®% s °17 ° ,� � New Substation ; / ■ ■ l CR46 — Milliken — - 1. °- -■ 1-°-_ ° CR46 ■. Existing Electric Transmission Bacon , la � r,� and Generation a r /'"F°' r' 7' (Digitized from NAIP 2013 Aerial) 1 /,aFi ,11 rI e+ a.p CR=44— ;' ■■ ce L.L�` ,° Substation • • i r oA SW __ CRa2 IL Ncres Canal Berthoud Generation Facility ear S t t_ti•n - Ct2420. I - - t.. cR a2 Gllcrest, I Structures ..� .r ( ce! ■ (Digitized from NAIP 2013 Aerial) CR40 CR40 • CR40 --r -• c s` -CR40 > ,l y II ❑ Residence•I M Mead l' rn _ _ 1 ` ` '■ in Schools ..___ —th U CR=38 M in � - 1 s car 1 (CO Department of Education 2011) O W U r. Z In `, + 1 School 1� _ 1 b T ced Z CR 36' 1`ep�r�y CR 36 U - c " D rL; N - r = • z I !_ .7/77; r ' v Parks `- ; _'-^ �, (Census, 2010) 1 !�l� '1 V f i C,R_34 ,�i1 ••. it Wilton1 r °� �-a y -�- ° I .I ° I ;� State Park Reservoir r:t.IVr • , : r• LuI.E' v ° ' firk /7{or»rr, --i ° I Subdivisions Z ADAMSAW. I- CR=32 °° - - ■■ 1 (Weld County, 2013) y s j ■, t/"/us!!7r - - I ° I Subdivision - 0. ==T— - ll - —c �� _ � � � � rRattl•snake n Iii ll r . . .* 85 r � H s _ � � � �i 'i ° �` olO.,tt'rc cc ■ Rc',<rrnir l r ti re , PPP r- ■ p a� - - ■ P -Iu-23—�I--4-- rk — —■ • I -■- - - ; ° - WO ■ CR 28 ■ ( ui!•in, ■ ■ I • •`` { 1 Xi .1 ■ ir r - � —� a , — I SCR 26— a ■ ■ I ■ ■ a in I Firestone 1 J ■ ■ y a ■ ■ ■ 1 _ ■ ■ ii- Longmont =_�-:- �`_- •i n.3I - ■ . i{ �1 �i ■ • ■ I :, 119: „ _"�'� Li Vail iBD _ —_— - _ {■■ / T -■ ■ ■ ``vs ■. ■ O 1 ,: L { ' • ! SCR-22 ■ i i ■■: ■ e ■ 1 O I e • i MI O _ S . y ■ 2 i • i■ ■ r ? i _ $____,___a ■■� �' ■• ■ *CR 20 c m ■ ■ r ' IL 1 i —CR-20—i- } r I ■ d ■ Z Lill � { ° _ - a ■ c a Golfer p tl ° i 1 U I I ■■ •ta■ • N- ,. Substation n �,� -=CR=18- - - ..s_----__,L— _ _ z �„ CRe16� T 1 v �1 �� T j ❑ _ ' Keeriesburg- = - Hudsonr rederik1 — . . -11 ' C 16 1b r� i Sh-f•r G Greenhouse I I j 85 - Substation �r _ 0 0 1 .5 3 9 _. -y— Hit _ _� 3 C R 14 I I I I I — ( fFLIt; -- ton ' r r.rd 1j _ lcr „ir Miles -s- Revised: 5/23/2014 rM ' Path: P:14929 SW_Weld_ExpansanlGlSlLayouts\Resource_MapslDevetopment mxd NCe CV cc ti -- li i r. nilir2a5 ilIll.IIIII la it ... _ s l _ tC 0) ILO 72 2P P I , J! rthhIhahuiIhhhhhi v cc ce CR10 cr c CO z in ss i ---' .) I Weld County F •® _.. LEON=A=WURL=PY i il CR 8 1 a • ■ r ' ■ • r ■ ■ CR:8_ 0v `` 2s =I_(3 Erie SI In i - U z ■ — II—CR_6 — o ■_LrU__k �R,,6.-�_ __I 2L 'rCe CR 6 f.�. ° 0Cl Broomfield • ■ 1 __ 1 Prlspccr = I--== ■ X76 - - . % CR 4 - - CR4 : -I Resen;l,ir 70 70 Lochbuie= 1 O �� '__. ••_ -r- riwSires w „!„.,! b� _ WELD COUNTY �,.,.,• TRI-STATE ____—.._..—.._.._.._.. 168TH'AVBABELINERD AMS CQ '-t_ .•_ a v •AD UNTY' !'cl,rnir J I j / / Thornton I_,;� Brighton II # Figure A-6: Development •��% t-�' �� ,% .vim��,/ i ': I �. I r i Ll. - - �`� . \1� "�• �''% - dir4 .-- . — < . 3 . �� . �, Game Habitat • tm l -- ---- H CR:52; - --- - i. I ' `T-. �` ``\ ti - - - -- ._ ■/�lY /I �. / � —I � �: . ti, . f �.F.:-->> • Species a atH ' y /� �r•�f�� Ire '�. /� I V , J ; r . ti , �,.y.;>'Y r ' - _ iARIMER 'CQUNTY ' _ �`�C''N s :' z iM ? ''- 34., , i +� � ti a ti` Y 7mw V . . _ _'� _ .i �. �Jr ..�. �\\\ 4Aiciet ' r �� `+ �• \� g r ,` y♦> Lowerwham ' GR`50 > > ihe WELD COUNTY `� 4., . �' '.• yti, �r. �_. ,. ,Evans .,Gti�4 ��A `a La7Salle: Legend as,N.._,, _ _,. - - j - --.. .- IE -an. .,r,` ;ti.� * .l _ V _ - CR48 .' LudYArea M u jr ele La + Illllllil e. teafial Johnstown .� ' �• ' ' \ New Substation f CR46 — . :' / r. '`•'' - • CR46 Existing Electric Transmission r� Milliken Bacon)•�rI \ewe Lc) �� t , and Generation O i ��rali Like,U '1/4 N (Digitized ) — , Di itized from NAIP 2013 Aerial "4, 1- /r !! .`._��' J CR=44— ' c�i L..L I� ,� ' • Substation jC : .. .�Y. 85 ry}�i . �1�'- `• • �• ` ` }trill' '•\ •i 1 aT :-S� Berthoud U ,` %_ CR az "S ti.n I G cR az J Generation Facility ^ �, �`�. . ,� iT.. '_ i. CR a2 Gilcrest , • I r �,. �/ • Lt . _ US�tpliY (Colorado Parks and Widlife, 2013) — , CR 40 CR 40 CR 40 I CR 40 , I �,• li I .`,ti t' . Ring-necked Pheasant Concentration Area ' ,•�, Mead " I ' Wild Turkey M M el,..�:'ro�� U f� 1 CR=38 fce �.W i 1 0 " " , Winter Range Z N 'J 1 cD J K , . , • ' I i . Production Area Z CR 36' _3 _.'. CR 36 ..• ' U d' • I o t--- I ��ry 1i I) r • ' .. I Winter Concentration Area `` IF' t___ I 1• 130 'lc' White-tailed Deer �+ f CR-34 f ,t t Wiltonl/ik Reservoir 4. o ti yI Highway Crossing /.alit' I l `4' ./r 'U pii 1 ADAMS AV /humus �� 1 CR=32 Winter Range / Concentration Area Illlli••un � ' l'I — -:L.% _ ' Itistrrnir � � � �� sJs s � � � � � � � � � � � � r � � � � � rRattlesna a U ,� �+ ;;� , ' \ct7 • , RicJge I Pronghorn • re ++4 .Ir Substation l`t `rt'r ' \ c> �` � . '• . 1V ' ' Severe Winter Range I [__, , � ti `+$ �� t } CR28 , Winter Concentration uit , ,,„t„, Wh• •I•r Lake Si ' ` ! r,l,r > . Su•st.ti.n �•+� �� ; t' I l } I �, 1 .� } _ •+, 1 �/ Winter Range 1 l " ' w I t' ' ICR26 Firestone iflL - - A_ _- ( 8— MuleDeer Longmont :�S% 4. } Highway Crossing _� FIRE TLON�E�rD� �I } \� ' , , .�' •��` �2 0 s` I ,_ _ '4I Migration Corridor Q IA • cc- - MI Orr ove Die cR=z2- ' ' r op Severe Winter Range l-tt; �. .` elI _ HI �:� '• I +�►� Winter Concentration Area lirz \ \ I CR 20 -- +yf �+ ' cR 20Concentration Area W .. , o I o '' �� ` ,y �\ ,T2 I M t -fa'i J s Black Bear ��t �\\�` U _ , " �+�' , s K enesburg SummerConcentration Area I o Hudson, ++ , o � r ��ll I : �, r I ,�+o� ,, ..�• _ \��1��LC a+'1OverallRange�� Frederick r�,+ �!. ,��`‘‘\� \\\\ Z\\ Al„ f b —y / G Greenhouse 1/:.:44:4:17,.:4:::::: \` ire •. leass..\:i .. � r,�Y; �, cR is I 1 l5 I 3Iatti J Fort Lupton �s . , \ 9nrrl ��Alt �. Miles .•�\ . Kttrrni, �� \• ��p��`;`• Revised: 5/23/2014 �� . N r � �y }.�� \s t \-1 i �'` II { Path: P14929_SW_Weld_ExpansionlGlSlLayouts1Resource-Maps1Game_Species_Habitat mxd '��4 N JFL 0 .?-'2_cc ii ii0iil NIIIIIIIIIIIII ll n :Iti• �` ` - I r i ' - I C0-`\' .` �' ... :,.._'i+� �• ' �41`�.,'y ,��\ \\ -i30 25 0 80}♦ %. ♦ . •1)\ •tti �- . �\ (9} ..��'' ' Dacono 1 ` .i,. I i' ' CCU c�i CO H }ir\ CC Ill 5 _ I. \, Weld County 1 O I D LEON-A-WURL=PY = r CR 8 t?4 -- I ' ) CR 8 @ � . \` 25 'r Z�= _V" `_ ,c Erie 1� ti� r. - ell raj ,1 �f _i 1 I�CR_6III-11:11 I- o C s v B — I 6 r �' /•or �m I ,,o•/ i, Broomfield I t Lake I �., J •y - CR4 — f i�\' 4• ., a". • P.rnspect�r 76 Reservoir• 70 s nver '° /� I it re A Lochbuie ' e I , `\� •��• `M• J ? • = i� lt4 ' O 4, WELD COUNTY �!r"" _ + • in -•—••—•--..—..—..—..—..—..�..—.._168TH-AV_.._.:� BASELIN pp�SSMtInk I -•— R«'`';,;, — = — —.. RI STA T TE coc.....nion_arksmns.IncII ADAMS COUNTY,f �� , Thornton rf i--{y ,`"-, Brighton ♦ rt � i_ )'{Lt � lli PSG -, 1 s Tia to nit berA•C a re �.. Figure A-7: Game Species Habitat ►,��, I I - es L_I _� _ � '. CR52vI - I :v • Saudi to Avian Species HabitatH �. . , �' r IIIIIIIIIII, III- III Illllllll, Illlllllll, Illlllllll' r l .L 34 j LARIMER COUNTY ' ,� O-- �� 3 V �- ••--• •- •fir, Evans 3gn La'S'alle. L«„er CR=50 'c -n WELD (COUNTY I ��. i : t ,� cR �1 �, Legend 1i I M Luihuui n � i WI I " (,.. Krsr„nn cc c _ 0 Study Area • I -yep' ,„an, Soma' " cR 48 1 S dy Johnstown- ilij: New Substation I ri- � i 1Ct246 Milliken - ! CR46Existing Electric Transmission1 p I \r„ell "11Srr. and Generation /!«rein : "Ae in I : r l«kr ! . I �"�4, u1 (Digitized from NAIP 2013 Aerial) cc ft I - . r - Substation �,. « 85 Net Canal 1 Berthoud ce f.• _j S(s' Substation J Generation Facility I J ~ J + - CR 42— - CR 42 CR 42N. 1 Gilcrest 1 0,1 I �i �, <<�tie' ''�r'� - Species Habitat � (; 1 (Colorado Parks and Wildlife, 2013) - V •- d CR 40 CR 40 - -- CR 40 CR 40 I , / I `'� I I Osprey c,, Mead 44 / rn ._I r, CR=38 �- ar rmi r�i i cri 1 I Y Nest Site CC .._. Cu 41 1 z .. t, U O 1 N Foraging Area r M I 1 jC 3s cR 3s i I Great Blue Heron O - 1 v 10 — • Nest Site cc u 1 r a CR-34 1 :. J I• ` 1/rlr«n \, U V l r X41, I _ r o L I �'� I rr:�r„r,r� 1 II Foraging Area L I ' s 1 Z ADAMS AV rl,r,;,,,,. , > E ' Ill / kt _ Bald Eagle GR=32 I r ,� i`, `� I�11 � ii 1 :8it: J t S I v V Substation0_ / ,,not 0 Communal Roost P /{i.crrrap. 1 1 _ 4- / } CR-28 Winter Concentration Area \/ Hi ( , ;;,;. - Lake 11X..///,,,,, ' • . I . • tl 1' \\ „ FirestonI e tom. �„ti�it l/ruurCf6 — , i ��Al• 1 CR 26 w I Longmont — — — k { - �► 9 �� tRESjT.ONijBD� { , I ) C3 _ )1 cc Pi I Cs—.. ? I CR20 - -- I CR 20 ii- I I la ce Golfer 1 Substation p J I M — — C12-18 i �h — CR=18 � U c 1 1 I o Hudson s%'Keenesburg I' I 1 I Jrd Frederick�� , ` Greenhouse cR ,s Gc\\ 0 1 .5 0 3 f 1_ CR 14 I I I I I • — Yi Fort Lupton , /le,,l , � i f Kr ,r Miles f 52im- Revised. 5/23/2014 rr 1. 1, N N r \ \` Path: P:14929_SW_Weld_Expansion1GISlLayouts\Resource_MapslAvian_Species_Habitat.mxd r' I 0 V 1 l � � _ �\ W-� 1l1 °, L.N2r_aplliIllMillIl 180 o v Milin j� , t 1re (> L T r irr V . - .I , 1 I U • + CR10 7 P it : - Dacono I ` we i , II ,- CC co - J z I F 85 I �� I Weld County 1O LEON=A=WURL=PY = 1� CR 8 _- 1 = CR=8 I 0 0 1 > U M U 25 �_�=O Erie I 0 cc `- ` i W I 1 z I ' �"�' � is li It —1 I Iii _ II—CR=6 1 -O CR 6 41 I -- -- - - - e CR6 • - s..-•. 0 a O I F) r3- s m I `` Broomfield I r Lake I prospect + i6 11\l cl CR 4 CR4 Rese voir 70 170 Lochbuie 1 O 1I , WELD COUNTY_ Ic„err — _i —..—..—..—..=- — — — — —..— Ca TRI-STATE - Z — ---.. II._ —..—..—.._.._...._.._168TH-AV_.._.. BABELINpp�� :� -- '._.._.--_'ADAMS COUNTY . .r. , iiiillW I /) Thornton �� I� Brighton i c i Figure A-8: Avian Species Habitat I- • • l .�- 9 Transportation LARIMER COUNTYzI i i t ,• \ NI l'i I. t t . rj , i 1 Il V .. 63:71, 60 � ' ! Evans R•39A "La Sa.11e� /.une, CR•50 i I WELD COUNTY �uJ ' • ,4,) 1:I} c crrinun, 1Reservoir ci Legend • WI b . - • - - �, FRONTIER HELICOPTERS f �, v,rj M o o �, �� cc 1 ©EAUGH cR as ' L i Study Area co Johnstown ' -•'�'. o ~ 60 I- - • i `� .---. -- -71:210-., 60 �` 1 Q 1 _\ New Substation r �" a�'~ j EASTONNALLEY cR as Milliken - VIEW! CR-a6 O �' Existing Electric Transmission Newt!! r 1 1 ;„ . ,,, ; .•, and Generation !ahe + Lake 4` �' 1 (Digitized from NAIP 2013 Aerial) - - 1 N • _____714i: p ' 1 l� SubstationIsta L.L. ,/ ,� ` t' t 85 Ic�i Ner-s Canal Berthoud 1 U — CRaz - -- substati°" CRa2 J Generation Facility ^ • . / CR a2 J ' CL i , folGiraligli �1 • �' �/ r R""� Transportation ' / s �� 1 1 (BTS and CDOT, 2013) SKYLANE RANCH `• 1 i CR40 • CR40 - -- - - •CR:40 ' CR40 © bf I Q Public Airport Z Mead o / I M G en 1 r, ._..:..o CR.38 f' �. ,n 1 Balloon Port w / i U U ' O 21 ! CC '� M I I Q Private Airport r, f jCR 36 .✓�` CR 36 ¢ m - U I 0 N I Q Heliport re 4 ?Cr) I I Interstate I ^ CR•34 * r /ilrurc 1 — — - V1 It a1 Re•,re, rui, U.S. Highway I Late . ' Z • ADAMS AV l! """' _ ' — - State Highway - 1 CR32 I • k� © RANCHO ©KUGELSTRONG 1 Major Road %lnd/i «n DE AEREO 1 ' x.66 ! — rtisc•,��,ie Q — -r _� S � _ _ _ __ _ _ _ _ _ _ _ � - - _ _ _ r Rattlesnake _ _ i Local Road AG-AIR � a__ ..... rn 86 Ridge W INC Su•s .ti• 0. — (( - r rower � • `� � � � � � � � Rail • 1 _ Reservoir ' U t 1 CR28 • C rl,,ins ' Wh ler Lake — I •� Lukr u•stati•n _ 1 ti�.itl -- r •\ ..' \v .._i .• CR26 al - x� Firestone j TONGA ' I ) 85 3: 1 ralli Longmont $ �+ ' a — . — — 1119. — .-.•-i5,--. FIRES NEiBD r . a 1 r f' co 1 I� Q 1 c `� 25 I1j I t ,f `\` �1 �_, KAUFFMAN a ; CR•22 • I �°'� MI MURPHY - IP 1 f/ Z .', - - - CR20• - -- 1 CR 20 / _, FREDERICK-FIRESTONE 111 F F.S. #2 Golf rz co I I m O ! I Substation v RHOA'DS . . • —' CR 180 -� co CR 18 rierrr' •L_ l z rrKeenesburg j c� O � ua� I I ' Hudson — -.� r� f 1 `' 4 PLATTE ' VALLEY CR 16 ��`"--$°-'- • { 111 I WINGS.N*THINGS I M AIRPARKM--� Sh.f r o Gre nh.use AIRPARK Q I & MUSLIM' i . - ___ _ _ Substation • r' • ir LAND 0 1 .5 3 : ..� __ _ -• _Frederick /' I CR 14 I I I 1 I (30 - _---C � — • 1 p t Fort Lupton — — — - —� — I i fin/ Miles — — — sue__ s .— f f Reservoir nir Revised: 5123!2014 Nen — L52F Path: P:14929_SW_Weld_Expansion1GISlLayouts\Resource_MapslTransportation.mxd © PARKLAND 41 cz 'b �� ' ,_ I - — --�__. — — �' 25 . illIllIllIll illi 1 I u°i 80 0 w Mein h SLlCKLA C •� a ie FARMS — V I CR 10 ro l I-- I t3s 1 Weld County I O r LEON A WURL^PY '' - I cc ›- ' r-, . Dadoho .1) . ii CR 8 11 CR.g,� Win .1 CC -. �f/ Q U N U is i6.....„,! ..1,(:),, Erie ' w cc v- i a —I J .. Ill - CR..6._. L _ p CR 6 - IX a, CR 6 f.d. ! O • m Broomfield �\ I>� 1 Proved !EI ----- 6 :1/ CR 4 CAA- Kevrroir 70 _ 7e HOLEr. Lochbuie , O PZiERIE ; 1 _ .- / Horse ; MUNI •" _ f TJ� � �� WELD COUNTY ,.eek TRI-STATE - ••.,••-•—•irt us•• 1 —•168THeAVALose. � .. IBASELINERD �....�... .-... ..r....... ..S.. S ••SIn SM.••.�..i..men...a •• a ••• ' J -Tr 1 COUNTY lrc �ccni, ,, . / s I I f P Brighton ADAMS Thonton I I F Figure A-9: Transportation •I .1 '` . - ; 1- 1, • 't •. '. I e _, i+i -1:27.7'12---1/4±:' ' •' .i• f• 1 ,. • 1 - - - - '- ACR 52$ — —r=-- . - - - �— - - - - ,n • i ; �-, .- ./ ,. i f ; .14 1=�� ; Surface Water _ LARIMER COUNT f ? 7' ;;, , : , ` _ U ir0Ft— •--••—• I t + ` �: Evans a ( Ile -Lower e CR50 r WELD COUNTY _ :. c��9 ' + S . , Legend } I I Lathan; a �rn i .._ . _ _ i ' .�."`�� - - �I i' kJ.' r— :— -��. I ' M Reservoir cc' ' I el 1 i l ~ liter.,� -. �� , V U L i Limo u — F -� U to Area • CR 48 Study A Johnstown —"� --NS - I 'I New Substation en ,ili* .� a CR46 ` ' ' - J r CR46 Existing Electric Transmission Milliken -� • A y ' and Generation O _ l≥ur'r+„ I /.akr t."i _II if) _ f� I ' I - t (Digitized from NAIP 2013 Aerial)ii _ - " CR=44— �— o t F v ' • Substation Ce I-- • f `t / ,11 r 85 ,...._ re Berthoud) I Neres@MO 2.1 Generation Facility n I - — - -- Sut�station I L.L �� CR 42 CR 42 CR 42 Gilcrest if '�' , -r 1 m r N. �� Hydrology II •is / 1`L Rw�,( -- i I (National Hydrography Dataset 2010) i • �/ CR 40 CR 40 i ' I -.. CR 40 t A - •-t '` CR 40 I Perennial Stream , Z M Mead "' ,' �� r• y Intermittent Stream ce M in .._.,._o� eR=38 ` ce en 0- - -- in ' Waterbody I O N...ei - ..,„ I/ c.) • t•)1 Playa Lakes jCR 36 , ' r CR 36 tit ;' • V ' (Playa Lakes Joint Venture 2010) 0 1 N U` ' U• i Probable Playa I a, 1 - CR-34 I yin,in I (re 9 Wetlands • ! II Resrnnil' N. (National Wetland Inventory 2010) 1 /r,ke itre I NWI Wetland Z ► lltU„lfr.1 r ADAMS AV CR=32 • I ' ` � '=- ; 1 j ' `Digital FEMA floodplain data not 01irrui rrrr • . LII I available for project area.kfilbaje I Lie t' L { Substation r 0_ ' / ru, ; V { - _ Re.ceI't'rr; ' ii.arn in YY ,� • D - : - j � —�.� r � i CR-28 — - t t! ,r' - l4 _ 1 l l l'r';liu C I , .....4011 r c —_I CR 26 • 1. Firestone ' I W 1J l 1 ^ �. •fir I 1 3 85 - I� I 4 Longmont . , FIRESTONE=BD ', II• I r -. {3 r o 1 _ a { mil • - ≤ 1 r Or 1 t!'I' C'r " 1 [CR42 ' 9 I t NI Iz . t al t CR 20 I CR 20 la 9 l : Z •_ . .4Golf-r ,. . ( ~� •• r ,, Substation ' te - C 18\ f2-1.1r_ _ 77�r >»> C � , a v t Ufr cc Hudson �� 7 s Keenesburg t I Frederick ni L 7M �.I , cR 16 I .,-,:f ' bF—' LG Greenhouse • / I � � � � � � ;85 7� � � �� 0 1 .5 3 d1-1---- - — — CR14 9 J Fort Lupton 7. I nrd I I I 1 I I /cr „;'7'r,i, Miles — m- Rised. 5/23/2014I7 , 1j ro ` i Path: P:14929 SW_Weld_ExpansanlGlSlLayouts\Resource_MapslSurface_Water.mxd I ji 1 •- kinizrapliallillill ILI li ..'"Illillio rto- n In CC F7759i.� N. se" \1\ U d to tp - I N v , ` ; I I c U CR10 o to C� } : Daconoo z + f ss I Weld County LEON=A=WURL=PY - CR 8 CR=g cc Y. -. AIQV NV25 �_ _O"' Erie �a) W ` .' Ill 0 • I—CR_6 LA' CR 6 ' t ce a CR 6 • f.-,, ix r--' a) I ` Broomfield Lake I Prreper'r - + 76 ll\` I 3 CR 4 ' - — - - CR 4 Ke.erlair 70 S _ 70 ' i' Lochbuie O i �' Horse — ',�,��wa � WELD COUNTY _ flTRI-STATE `�_/ - -• -•--..-..-. —..—.. _..-168TH•AV—..—.. B,ANERD -•—••— —• _. _ _ _ (7_i!. _ 1 ADAMS COUNTY ReCel ,,,r, c 2 Thornton I Brighton I Figure A-10 : Surface Water finis Swanson, Gustav l r 1 r and Annie, Farm I CRsz Historic Places J s rBrush! d�� Om 1 � LARIMER COUNTYaY Jared G�,I °: , imi aa3 U I60ff u .._---..� L., Barn 59a . " Lower ' CR=50 CL �. I WELD 'COUNTY Evans Lasalle `� Legend W Reservoir�� fir,,,ii scs Johnstown --_ � 1 g1 Study Area U • CR48 MIN Anders•n Parish, Barn Harvey ' ' New Substation IJ., House Daniels ISchool CR46 CR46 Existing Electric Transmission Milliken , O I \race// a — • - • ' 1 Lt) _ r rs and Generation ' (Digitized from NAIP 2013 Aerial) LuGc' !e in y L,r/r' 0 Little Thompsonus I t b River � -:A „ CR=44 ' • SubstationCe t . 85 / ,11 ' G 'el ::61 Neres r Generation Facility II Berthoud - --1= L_ — - Substation I�� CR 42 CR 42 CR 42 Gil1rest V,.\ ok- R �� Historic Places I / \ ' ce o (National Register of Historic Places, updated through 2012) IHist,� CR 40 '. ( CR 40 - -- -CR;40 - CR 40 I t �) ' oric Place } I M Mead " rn ' 1 II M M ' ....._o CR=38 M in U O lG 0 U ZIn I N J a r ' ii- ei Z CR 36 CR 36 a K N ' V ' United Church of cc j Christ of I Hig hlandlake ( I CR-34 I Hilton I I V 1 Reservoir r cC U II Lurie• 0 ADAMS AV Lltutuu. �jj ' CR=32 ' +Halligan WI Oa WateffErn‘ I CD ttll o t; Substatic n L.L l ucrr ,I in Cc ' c.) Fort „ Vasquez ' CR 28 u/;,in. I ' Wheeler Lake A ' x 1[7]. ! rrl,r I. ►ubstation L ' P.f) 1, ' — CR26 w Firestone I El I,_ r 85 C Longmont _ ',i --College4.„.--� 119—..„-------.... '--- - IRESSTTOONEE:3iD - V, r Ilir_Lo Igmont I 1 ' Q �r is I I J 0 cc I IF 2 1 CR20 I CR20 W J r` re ' I €olf•r ' m v "T I' I Substation I,- 0 y ' M CR=18 CR•18 I a co ° f I Hudson / 7 # Keenesburg I in— c 16 Frederick , t t_ Greenhouse , IlII +anYudi 1 G bc;y 89Il 0 1 .5 3 i CR 140 C 7• U r of t Fort Lupton Miles Ottesen Grain Comnee rfr r; voir �� 52I��= � Revised. 5123/2014 { r N iM I:eB„ \ Path: P:14929_SW_Weld_Expansion1GISlLayouts\Resource_Maps1Historic.mxd U ��MiUI � � � � � �� _ — _ - ni2M5mil:Willi, W CC � V In rc CO Dacono U s i Weld County Llncolh `,, �� 'tr) J V School f� t l r nur. U LEON=A=WURL=PY = CR 8 CR=8 0 s \ -. c, el U 25 � , Erie I �' I _ _ ` I— ct o v I Q I I�CR=6 o CR 6 'flyix CR 6 _. • f`a) O Iill Broomfield I Lake Illi'rrrspref +.. 7e J W % ti - - - l . - - CR 4 ' CR 4 Reset'i•nir 70 S _ 70 =p.I Lochbuie 0 ',�,�� WELD COUNTY flTRI-STATE Horse c_•a% � _ - —.. •- —••—• —..—.. -168TH•AV— B'ABELINER� .. i_ l• 'fir' II COUNTY Ra'ar,nr, ... --11 j i f t Brighton •ADAMS .. , Thornton t Figure A-11 : Historic Places . . ::, :•7 d' a -- - ° - - - I - ° ' 7CR52. • 0' 0fill a •rJ _■ Ih,. t-r °° • ° uri >'.i a ieir";. :i: 0 ...„ ..!:LARIMER COUNT .._..�:: _ i' L , '° E .0 we!'" :, ■_ sr~..-, I�,i, °, . 3a 9 /.wirer `CR=50 p U WELD COUNTY• �' ® Evans • �F;F3 Lea Stalle = `ill _ ' - : ° ❑ rLegend;. H. (ttlrrrnr �, � 1 ... , ® a ,.� . - .�, - .. _ 0:; :e;z::D,;, 0 L:•. c`:;_; 4,. _ .. ::0 GI is - - -am ' - V I -Ll• V ; W :�° i u : u:tation • V — CR 48 L. 2::::40.,:::. - •■ 5 r rl •• n �.,•;.� }. - O CR,. I '•�S'' ,,, •1 tA`' CR46 ; .a■ E p Milliken '�j 0 :: c' :•:. ;1 Existing Electric Transmission I ��',rr'// E d. .. v • CI ® . �� lir! and Generation — — ! ❑ • 5> '/ - ° • 0 n ids-y,, � E 'Si (Digitized from NAIP 2013 Aerial) • ❑' ° �, © .. . . :<:�DR'II ..,:• ® a , - SubstationCY �' o a ,;emu jfNeresirnfl ! 1. J Generation Facility — • Berthoud •■ ❑ r ^.. ;:® ;c; ;::•;:a S°; tj?_ • CR42 — L ;_.: Substation. O ';6•R 42 rte: `lit hJ CR 4 : GIICreSt + 8• :.....:•' 0 u : 4.• ® Le ■ ® :1■ � .:;� ;• o �: • : £' - _(.1 ■ = Water Wells � ' a : u ®il; . (CO Division of Water Resources, 2014) t: _ _ ' A C. ' C :. ' _ i E a „:\-<.-.- F. `'3 i` CR 40 . ' C CR'40� , -' =8CRI[40L ;_ _: � ® �+ CFA()40 :P 1 _ :, ;, ~'III rai .. _ 0 Application Denied, Unacceptable, or Withdrawn Z c:__ M Mead E ° ■ tsu • - d * ;, ` _• • Permit Canceled or Expired '-'■ . _ " �; CR=3s • O. ■� ac t': 'at'' � �;,, ;U; ��IA •• ® ■ - ;� � U a Permit Issued or Extended C ,'`• °• Well Abandoned Z CR 36 CR 36 • ( �•❑ u • crIfi : �o :�• `; �� ;' >y= r ' ,: '• tI Well ConstructedMMEMMEM °it • r ° J ' '* '' ,o� ® Unknown E Ac. OW-34 ❑ r.•. C • ) v • A p .� - ReNerrar- ■ L r . _ tx aJ v •` ADAMS AV• //rrurxrs ■ 11 :'-t GI8 Si®CIM 7� -,0 : — F Ih'serroil- ' E l�� i atU-snake 0 ® v �❑ ■a- • ;5 r I ❑ cr. Y �i ■ Subs'. ticn: -;_r! • Ail g'. C 0 ..;. //Omer, <../. ::. ,., <•:,_ 0 5.:. - r;;.:-Ill-':::;::::::";0_ ::: - °()37) • '777Ai Il r _8 �''' C 1!j ij 11!'i(S I't: ■• Y Ni ® .� 0`, \ r , :.'� �>` * -lE • � • ■ ,�1• '� ' (_ ® ■ � i t t _ CR 26ek: " it _ 'J, IA■ AALLI . ■ • Firestone • rr a �_- P - .» ' , El‘Id• IL Longmont E T ":453;4 „.".•' r:; __ Il■ ■ 9 is g; ® l ( ■ :A _ "-t" 0 :,Ns ' ; X113. ••. rcE _ FIRESTONE BD I�{ ':',.; t•: •=:• Ef-' "I<l ' ■ C L ■iiu ..is o „s ■ :9 0it• Iti:t' E E f7 © rZ� •• .ICI • , r °e a''■ B = `` • A hi` 0- mil W Sif7 E 1:10 0 O II••S •'•. ;4.-. ■, ' _ 0.;;.:E:0: 4f ; E O - r.] 0 rrrt r41 O x-t> - • C TA■ :RR. 20. _ E ❑ p ® - CRE20 EEILI 9. �• • of er : ' c 4a i "i Q si , ,_r7e_ E • 1?a41 r.:• ' l Stlbstaiion :a■ rr EO 0 h ■ I' E ■ E E `. :; i45 0 ® 9s3;,. E] C:^ r • c•Uit . . I _ �, - �` ';;. �q` ; ■ - • •• c •. - b '..'-CR-18 ; ,L❑' ° U Ill �hCj^ , r CR=1s `LLr '� �� r®`.� ''' i t' 3 U ilit's.;;:;:litiri3 '❑ ® ❑' � E�� r.•E ■ :o J ?� G :p o :r:• H ® _ �k enesburg: ._. - •;S: d 44 • •• •,; ,r c t • udson l - — .• G' I Ems' ., �, L7r•` • 8 - .- _ _ _ I_ ■ . . r .^ • C - 'JM ' ,.cm • ' 'r - -9-;:� CR 1fi- �� /4. $1 . '`�'. o 1 ■' E FrederickE]i I '' ::fL c c A ■ f •," o.;414I:' o Sh-f•r G Gre-nh.use ;:. 4E r E ( 1 as �. ► E Substation j ❑ it d. ® E E O ■ — _•� —E 7 — _ . • 9 :. ®t , ®: • ''' 6:-..:: [1.. ® O ® 7 ram ,^ y ' CR=14 ❑• t I I I I I 0 I I!: J. ' •0 hJ -E E _ -.•• i. • O ]- .:. - • I•i:'fy• Fort Lu ton ❑ l: :.`:: '>i1 c t•' E '■C •■ ]. U _ • ' ! •Al • l.(ii•rl -_: © ■ © II I. P u ° ;c: c'. -::. 1:1 ,4, E A ■ C3 ❑ ;: ° SA;. Hews-rah Miles N . a• : .fir'. {,t..} ■ {�-.: e ■ -, ;;N7 Revised: 5123!2014 E ,;L,,}y • 1 ❑ to :.•;' ' lam. :r- ;: .] Path: P:\4929_SW_Weld_ExpansanlGlSlLayouts1tResource_MapslWater_Wells.mxd E ° = B N NCC Ct-i .& 7 4 a a C'i ° • . ,. .,. _ a : f-. c_ a, C3'. PIM n lin..- im,.. Mill - - , •ls,V t iP .`#• '■ E =cf: Gi. E C. _ C = C ® 0. ;:•': IE .. 1 J ;z7 n 80 0 r;'c-• r ' i •f)\-: 4 :;:.`"ER C' M-• Y4 `# ►-.' ��. ; te _ ;:� ❑ _. l�ta ■ rte;=:_• ' E a° c' _ _ _ " © Weld County I.`z'' t G ® ° , .�`s`■'•: 1A:- - L•' r ... • • .• C N _.`> '' •h - .1 L'i _ - , i,-. _ • U C• _ r'�1 4 y-.. •S:: �. LEON A 1N.l1RL—PY - ❑ CR:a — A ) ,:•i• ;w;: —, •— ;C.R 8: ,-••;-t•:+dt• • E • �:,:Kr. . .� . t1z]'` U.I = ./� u u = n E ® ❑ :L] :' e > e 7° ,-.� 0 0 e)< ■. : .u ." , �"_, _ r,._. C v •V :_;.. M e� 2s • O/ a rnait, :; :a t' om / 4; ' ° :AF- _ ' 0 _t� 1 W I 0 .■ E E ® �. 4_ �G :a'• t :. a•wrap •■E ., Div ■- 4p/.•: p er, `I _ ;?. 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' , Ra lesnake • . . _l Ci �.' I 4 .. r ~� r ' Subst.lionI. / • J, 71 ----1 r 11+7..1 r2-'J7d f ( i • Inakje sMir ME -J•J ai• y�,;� _ y� p' •__ �K--_ I. _Z�-_ .-• -Irt_ L_�_ I _ •_ --__ _- _. _. t _ _ t-. _ ._ 1 iii , - , . . II7 .. "1- , • OLif , ... 1 . ,_ _...!:a ir,... tan .t Awe ca t I- _ . — .• � . ? , ` Substation I - _ 1 + �` c�itillR 3 t+YlfSki 1 / \ Ne It' r • , 7 i I LI )t t • 1 1- - t , 1 \--.% It-_..„ ..--, i 1 I \ Air — in . . • Ai.% tr.,_a . . . O4-- pi I ‘ ) 4.. l . , t • - 0 . ! ,,.0, milli ' rall7iii IIIP a FAMIMII6 ‘--.....= Par . 1.--..,1c3_, ! - it to , sm. IK: I ; 1 --\, ill 14.---, elpiThilill.. L, I ..t .1' laSSIS a i • e Iret, \ c i ,. _ a -1 .. sir '-r, 1 _A. Lazy z.7 , „.„--4 ' :, , I __ 0 ' - a lball,lejelt ......r. re., 11111 MIS Mr I LIIIIISSIII -. , RI ---cv\r, III liti 1 , , [ 4. 1 . ' ursi _ k 4; 1, 4 1 a .C.1--.--;: _ sipett..... ..- - et• ..- --- ..• rit • II , I ,-. a Jr .-- -0.0 Ilistliaglit_ 41111111111- o� W ll 1I Ip••n•f �. % - A t . [� - _ ?t•••rN VI/rr ' .••. ( A ~ % , '�� . ,` e Z l'. •' , . r •1 ~ , $U•_St-tf o 14040, 1 E EZ at g cm im / . _ _i_IT* �_ _e/ in rt!WE amp err=:� a;, OM —. t .44sc.., ha_- P- ---. f-' V .. �: i0 1 .5 3 0 Shaf-r -• A ''!' � � ? .Xti irtital � ito . ■�� I.G-iG�=@nho US- Y ` -/ ?1 -.`••• _L' ✓', E 1+ IIM j1 l :, ! , - . - . .� ylay Substation ! �', 1 1i' 1'1rM1 • .. . � � �T- iti7raiA11 �L _ I 111 �.r p1 1 , , 7 . ,+ r )-� IrOICi<f t'. 4iiiik G */ I ' . � : , : ''- �=/� ( ; ' I \ � ' tiy+1' ; r..w • Ngt) i ^` _ • , IIMiles Ii1 i , J �. p r' I , t • . .. y :` Revised. 5/22/2014 a /t. ' .r f `, � Ili � t � _' i IIIIIrirnalragIMPAIMPTIIIIIIc- n'r Path P'14929_SW_Weld_ExpansionlGlSlLayoutsVResource_MapslTopographymxti lAril 11.1. I -III lb t k f�>�Y c �� W\‘__ i .:..- -6-- c - 150" .....“.• r :r! ,st.- \ ' 1.-II' . • ° el.c 7,,,,. ap, . - 17. , --'. 80 .........N. le. NE , ` 1y �' rata `' I Vic• . *• L OM !)I �� i1S - � .. . _ _ rl •4t 4 — ` : I • _. }/ Weld Count 1 •4•1"6 • -'14>t '-e - 4 li ilitail . is o � � �3-7V2 r• tibia li i A 42 FM. y\ + II rill I i ) Ibli I M j .141,_ :.t ►` ♦:. .^" I- Ifir ••-A SE IllrN^~_ I IIt�III lllllllllt.:�r . - f -_-' �71.3 r 76 c~_ - r ts, .i(t):" ii,ill Jams •v- —4 — ; . 44 k . , I: • s. Ir tu-- ''ro..� ; _ .I ` yy� �' 1 ! I Ins;1 li J T '' Denver ` x A• 1 — >� •I f,' t - � 141 1 Q'� ' tioc•i•Ie•n• "; r ,..• `Z t � ill: » T R I - STATE O ill' Val I c iiik vtSlflEb !- i r,_ / r , '- l • rt. t I tom. . ..y�lj • ^r ' :ill __'Y • M':.r. lea !. ,,'diet'• ,. I .,r' -J •.,/,-yy!-... r iIll : 4 - Copyright t;2013 NatioInal Geographic Society Figure A-15: Topography 1or 7 „3 ,_ it r ,f_ ion • .r “).#4 10 Slope I— r i •. S se • 1 lir i 1 I ;8. N\'LA ' IME ' e o u TI �r •:z 7 ! � j' i _ .. r n south i le s4 V LaSalle `` . 4 Evans,; All i� i r 1 Lo couNTY .� 1 A �.� .. �. Legend a. Latham I • , ,ilsa,`.'!fl s ii if * 3 _4, t •: I y r ! f' -me /" ' raj Kew/Toil ' & tr w_ % t.. Ia b U ev w II r� •r. ;, ' l^ j rY +� / I mi. Study Area I �' al N ' I1 — / � CR,48 �- 4 •hns •wn �� i If aAY u; % / 4 ' \ New Substation ---- - 1 ' . _ _ ?' Existing Electric Transmission C34� . , / Millrr ♦ ' cg as I Newell ` : , - 1 - 1 is I and Generation O _ fk ' ' , . (Digitized from NAIP 2013 Aerial) -' f.oriml_- - - - _ "' - , / AI CR=aa c • Substation v i , i I "�i. . . ; is! r 85 `� •rs o�� y ' .. LU Generation Facility n�_� Berthoud /, /�'" /' = CR42 Su•st.ti.n cR42 an • IIIP' . 'c , ' '�' . fa,,,h 11 _ ' Slope ' .. n�;�� ` • ! q- I 0' (Derived from USGS 10-meter DEM) �� / °�� °�40 ' CRP4U 0 - 5°/�,0 o Z r - - , �I0, f Mead ,�,, - 47;'' • I 5 10% O CR - _ 1 , I n U e - _ • H r t_..: ' •.1 �•� _ '~ :4• .i ' I > 20%C.j t4 } WWI;OW /t('S t'fl iii, 'r. Lake • MI:,:,____ f v ADAMS AV Iholm!, • '- =C R=32 'Iii I 14 II - 6s I Lk A . A r ci. i L i ce I 10 Gaminc"r v F � � J � ' , - ' {Wheeler lean _ hl, c r`� \/ Substation I /\ r 1. ittt,Vrcii t C3m 1; Firest•n= `a _ a I Lorigmont =1 :.. - I IIf : ti ` •1�4 il 9' �.f. LESJTONiBD i !• ' , rI t .. r I �. , . • I _ r _.s _ • illuj'. _ ' Rm u @m� W 11 0 lit'chi I = C• = C: .'I - •`s CR 1d___): -. r itr•♦ r - . . - _ IIII Frederick�� I �.. - ® t393 :�.. • II b{ ;� G Gr h.0 - rIIMI • FEM.' ( .. . .. _ .� � � as_ i h a1 . aid � � I• I 0 1 .5 3 „ 1 a (12.03 I 1 i I I 9 itiFort Lupton 52 _ ' Resu,(,, Miles 0 ��- ... �, „� — . = J Revised: 5/23/2014 M. /.ord. N en -ti. �( 1' , Path: P:14929_SW_Weld_Expansion1GIStayouts\Resource_MapslStope.mxd . CC - - ' W fa 8ii ao -1: ' I Hudson 180 NE I. 1 'r, • Dacono • I g g g E ,.� ,__ __ I CO Weld County , � _ I LEON=A=WURL=PY = �•" _ °( 8 t = R-S •in - ZS Ui/f Erie o, � ' I E2j I I-I ' , 'I' I h Ste+ • v • z' v. _ >ill I-LIFIJI DM } Y C o CRu I - __ r. ce •'� :*_ °�" {� - � ._ -- . w r ` G^ Broomfield e I _ + ` --.r- P 4 .. h = 11MI i A► \l ' a C°33a /r — Reservoir .,T �' _ S river '' �� Lochbuie I"' , • .64 Cli i _ l i lle/-. / ;. .rte :,)r—,..-;_E D o Y � T0�RI STATE sil- � — - - - 168T AV ^-- /BASEL'INp��M r � _ _.. • 'es rvnrr� �J ' ITholnt_on Brighton D • MS COU _ T � 6i�ow .1n " !` ' +• A Ti.wlKr+.r belA•Garasre _+ Figure A-16: Slope Ir CR 52 to ■ —i I Utilities z ,, LARIMER COUNTY / 3 V — — - 60 - ;1 I 3gAy< WELD 'COUNTY Evans .ScR is Salle L „n,,,, 1 CR:50cc • r Legend �� _ �� _ .. ,. Nt srrrnir '• ' '-- ` „� h iI iMin 1 L 1 Stud Are in a rn _. . U CR 48 Y Johnstown -(6Q- — -w 1 _ I / / 11 . New Substation CR46 Milliken It- - - _ / ' - CR-46 t Existing Electric Transmission Bacon • L // I / I and Generation O • Lake x 1I /.akr• _ / _' (Digitized from NAIP 2013 Aerial) in 1,_:2 I j�,; I " a Substation Ce Berthoud1 `� Nerestr � • F Generation Facility / CR42 Substation - CR42 CL I CR 42 GIICC@8t 1' . 1I t- N..„ Riri' �� 34.5kV Transmission Line �` I F. I us 115kV Transmission Line I i CR 401 ® ;'Q CR 40 CR 40 - CR•40 • • M Mead // i• r 1 4 I 230kV Transmission Line M 230kV Double Circuit Transmission Line 1 \ : ' . i ' - O } (! / U MI ' • 230kV/115kV Double-Circuit Transmission Line j CR 36' . CR 36 11 • I - j Ill - N O i 1 tea_ ` /� .. J 1 Existing Natural Gas Infrastructure 1 �� .i _/ ��; l —�ai �c�a s:>■�I ; I (Ventyx2013) V ) CR 34 ©Q--' 1/ikon �1`' II "nt 1 / © Receipt Delivery Point f II Reservoir• I n. P lis =ma Lake (IL I " • 1 ® Processing Plant Z ADAMSAv. !humus - il 1 . I CR=32 1 ;tiaik•,arr i ! 1 10" Diameter I • 1 Q IKr,rrt twit- — _ _ _ I + Rattlesnake 1 " — — — —1 -- — f _ _�• - 6s. -- — — — — — ss Ridge i 11 20 Diameter ii I II I Substation r ci. 21-30" Diameter • L,. . Cam # I Size Unknown CR28 I f „1,,• S b tati• II r �i pr';tirr ' • I I Firestone I I CR 26 w Longmont iii - awaspesener1 / I I \ y - t9 FIRESTONiiiD� •'I� • 1 M \_i I r \�� - '�- Sir : ` \. •. li O I1 ; \, t r � u CR-22 I �� ceII/.)• ( 111120 ' i ! J I I 2 \ � CR 20-- -Ti 1 W zt , Coffer O y 1I�� _ Substation 0 V — •-CR I I ii- __ . CR18 v� I U v � . i I Hudson ,000H--------:- I �— I � : nesbu �FZI S Cfl —�r ,1 .: 1 _— �F� CR16 �`�+ leri iii'= s' rya - �_ :_ s rihm •I IFr-aenckallEillitill N _ _ �. _ • I/- � a - -Shafer G kopuse - _ g5 -� Substatt n '� I 1 I 0 1 .5 3_ _ lg.�; / l N !� in CR 14 -1 , I I I I (20 Fort Lupton - _ - .___ 'I P I 1 C It .: r — :., 52 — ' —J %% /rt cr'r t•ui, Miles 1 I I ■ ■ ,: N ` ; �■ ' � // 4 - Path: _ _ExpansanlGlSlLayouts\Resource MapslUtilities.mxd ■ / Revised' 5123!2014 P•14929 SW Weld ■i tt�lr:Ss s..: is was mu ea Ira CC�t6 —III T' z5illIllIllil W F I •. °'I I Pitt I I I I MCC I In lh' I . - U ce al Ellrn �i ��S s=7� I; 1� �. I �1 v v CR10 v j Dacono I. f I / c' CO .Jr_. I I r � / .1 Weld County IJ _ O 1. 1 I-i . t - , n to is LEON=A=WURL=PY ` ` CR 8 - I CR-8 o : -. G N i Erie rn 01 + `. r re W.... /_ CR.6 o CR,6 \ N CR6 -. •r - allia ma= :t=■a�r� s 1�==��■ �__� (J�.1:= =Ja■ a� ��[:s === pus« ■re - . O I an_� r`� Henri + y el m Broomfield 1 1 !; 1 Pro y,ect • - r�� 76 70 I0 -. -.■!: - - — — - GBr4c `/ CR4 - Re,crroir 70: _ o �1! I Lochbuie N • Yet= 4 _ _ __ _ _ II T�w�w�l � � 1 VkiELa COUNI�m`f < r, r� TRI STATE —168TH AV— BASELINE RD I - jI• — =i ' — — — ( — —jkmoJmnton ._..—.._ _..—.. Brighton ADAMS COUNTY L Figure A-17: Utilities %CR52 I. CC Communications i— i ..,kei . i - LARIMER COUNTY -71 �6 Lirtaish V — 60 — — ..�.. s g9A�� , �'�C Lu„cr ' . N� -CR=50 � WELD COUNTY Evans GR La/Salle . Legend W .�-�_J r,� /wham Kr�srrrnrrI i � � f 1 . L 1 Study Area I k. !1 - • - * -� ,� U— CR 48 Yf NJ- ir Johnstown j I New Substation I ' l CR46Mllllken CR46it-I* Existing Electric TransmissionOj Newe / ssii��(((( , and Generationlie!( r,q Nratis * '/ / ' z (Digitized from NAIP 2013 Aerial) / ,/Lr I U in !4 * r" I Cr I • � � CR-44— Substation t ir .. C.) r G r /r✓ rY..t.. 1 G 85� 1 @ il ' J Generation Facility Berthoud) - � Substation I CR 42 CR 42 CR 42 ' eiL Gilcrest , .� I * ica Communications Facilities • \, c) (Federal Communications Commission, 2012) ICR40 CR40 CR;40 ' CR40 ' et �,, f I I E3 AM Radio Transmitter } I Mead ..."/ M I in A Antenna Structure Registration IL.�.._o� cc r, CR=38el in cc cctaicc Z " I U 0 BRS and EBS Transmitter O lb U } I j CR 36' ® = CR 3s " I Cellular Tower N U Cr i I ® FM II c,n GIRL-341///ern,, I o , O Land Mobile Commercial U A I /reset 'r d. /-,e>E, ® or I • LaobileBroadcast TransmitterADAMSAV //tonnes ; Q ' Private PM Oa WateffErn I • Microwave Tower Q '� 6 CD BS • r '' {�l Substation * • Paging Tower XCL 1 ee lti sr r,v,ir I ' CR 28 itl TV NTSC cerl u/hin, Wheeler Lake Ak / „/,, .ubstati.n { 1 e0 TV Digital 1. { I 1 -III I peen „ � ` _ '' L 1' Firestone ' * CR 26 w CM ' y 1 Longmontf t19- 'I ' -- aagiEt JTiCN 3Dt� ' {----Mir _ ^t: _II IV DES t1j t 1;O2' IS n --CR=22�— I ,Oco , mil I I IF I * CR 20 I CR 20 7.i Vil la ~w' I I I le Golfer I l* aikaltitilia p U - : III CR=18� — U - . - ill — CR-181 —.:, * I * ofEr el • a Hudson • Kecc enesburg I O Frederick It - ,. * , CR 16 d' ^ Sh.f r4 Greenhouse r: ( 85 Substation � � �, T - lar .A * r CR 14 ° 1 30 Fort Lupton / tit it I t t 5 t I N u, ,r, roil. Miles I i=-0_— * Revised: 5/23/2014 co cc t r st --Ak._ —_ -_ 0 _ Path: P:14929_SW_Weld_Expansion1GiS1Layouts\Resource_Maps1FCC.mxd v N N cc 5 la 2 I 18 :., , in , IN. v 'V . _ 1 , v U CR10 ._ U ro I ir ' iz - Dacono `} izI CO z i c• * ,,A_ * as� I I a Weld County '.Z Dz .� I V vii �C ' __ O LEON=A=WIIRL=PY = • CR 8 CR=8 J1c> • Erie I�_I_O �' W , i � LU * I—CR-6 o CR 6 a, CR 6 1.'.cc* 1 � _NNW U Ca I Broomfield .pg,Lake I T PI r,?;,,'f, + �e l I Lam''! CR4 - — - - CR4 Kr,r; rrn; 70 - !1 - 70 A I * J Lochbuie ' O Honor ',�,�� WELD COUNTY _ flTRI-STATE liarntiF -168TH-AV— ji„,. QBELINERDWIPP * '�''�" „ ADAMS,COUNTY l,�n Oil W l• c el Tho IlntNakr on .�,t 1 4r Brighton I > A# Call wAr Figure A-18: Communications - C.. si 3 Prime Farmland ...I i } LARIMER COUNTY _ airJ ,. /� as. -- — — 80 -- —_ -- --- a ��.. 1 - , i• .R 0A Lu.r['r -- - cR=50 • - �� t' _�. EL o CO,U o : L _' IJiL ' s. Latham I s 3 La Salle ' ege�..• ` _ - 4. L i '. ~h LI Study Area•F J•hnst awn> T �� e I �,. - I ,I} a i ` ) rk -, _\ New Substation Zt -- '-rte ' ' , '� 4I1;;. ' ! <n � I F �., - - �r = - Miihken I — -CR.46 .. Existing Electric Transmission Yore!! _., '"^ - `` , __ Hi: 1 �, ' a . } •�Sk.. -it and Generation O Lrrkr •• Luke _ 1 ��•�1 ii 4 f..i \ i .1� I ' ' 'till' (Digitized from NAIP 2013 Aerial) •• -.' - � -y1 .I il r _ , n. _� i�• ` 1 �, _ ! r _" I _ CR=44 t -7.1711 a I U SubstationCY '• ill � -I r % N- T r. • ` i 4 ' � 1 ' t eves Canal ' I Generation Facility i i i. =� ,Uf ` Tr^ r CR42 /i• CR42 1 SUbStatl n CR.42 ' ' • r� is �j`o t' `" I . . #a 4,. - Prime Farmland • r J 1 �M ±"-',.\�'� ~ �{ ,� ' ' •' , � (NRCS SSURGO, 2006) i ''• , . 7 � _ _.) 1~ ' • '.. ' // / a - 1. r e• '�\�, CR4ol -CR40 r .} y+! cgao, = cg>4o ' Farmland of Local Importance • I j4 .. t:,T i I - / IL ' Farmland of Statewide Importance M� s'. � �.CR38- �L �4. � = = I I / ��t(�� "', a ' ' ' ► �frr _ 1:319i1;11::: tow- ��" I - ! r ` o • 1 t1 Not Prime Farmland -T I' ra c ' 1 '.' " ` I Prime Farmland if Drained and Either Protected z .� �. CRm ` �� " i s : ,,- r ` • ' ` From Flooding or Not Frequently Flooded During _ ri ,. // N { r w 1 1 the Growing Season 0 " ire- �'—(-` �1 4i r / �~ - l• ry �l: ' ` o,~ I Prime Farmland if Irrigated - • r llikwr 1 -�� •_ „ `� ' ~ f t , - 1 /tr }r .r,i lµ s2 �� .yl 1 Prime Farmland if Irrigated and the Product '� ,� of I (Soil Erodibility) x C (Climate Factor) T s - I a _ 1 r . N� a 1� •. f I Does Not Exceed 60 /cikc \ 1 " •. • 1 �i� _ ' it ,,.sir ".117.--4 • - ADAMS ,- -- -- - - ilifinr«s ) �r CR-32 -ir ,qt 1 Z J '_ by—MINS IC i� csufolr '• t [ � � � � � � � � a.*� � � � � � � � � � T � 1♦ r -attl �T� ;p rn i' 85 : t. Ridg: � � , Ii. ° 1 _ / \' 1 I SUa St.tl•fl? ;polo%ILT-_='n UM ,I 41 I •1",I — rte:. / rLc/t,r 1 rz U /•-• l r tCR 28 1 '1 t - , ... te Is Reservoir I I-4`t a.. , (a/,ins� I>-�-( il - `. I -: P Wheeler a - 3 * - x ► tithe - -- _Ai Substation J - ' -. �, 1 Vie ' /' 11 1t t' ' r 1�`1 ti ' ;e 1 itit 1/4 , la. i "�'� uAl i -- ..11:41-.04.0 ,tl . y 1.•... CR-26 • tr—lin• Firestone. - ~`' c 1 ,� yt .� sts ;,ft I %it . 1 At A , . , il— -- — = — __-ifF7c.Longmont t"e ' 1 — « — FIRE" : _',f;, D r . '4 t I _.- Sig io \?..), 1 - r•• t . r -4,-- t- Sbe, ( 1 'ISA 46 • CR 22: L' I c _ aJ f 1 l r. 1 i I .4.Ifreare - ��'�� ... 1 ,tom .. W lI Y. U Ityot -� Qc) - s .- - CR=18 ,•• .1, , 4-11 I • irlir I - 0.c . y.� - - --^.r.._ 'w • _r_: � —`;F ?8 - II — `- - kY r`; . i.111*Atw +� k v t •j � �• co / 1 ' I A ,edit �r P - Cf>r • IF _ =� �' 0 f,-- till) - r' - _:®6'cif' ill% _ �uuj Ifier ., « Frederick ra t M. - , , 4. 1 ' . r ` fir 1� aa■�jci . �" 85 ) u's ti'"'-, - '� 0 1 .5 3 Eli • Le, - of glis" - @l7114 I — - �`- - - 1 ; ~ . jft -" -g,� s - �" tkil Fort Lupton c?,'Rr. r - �s f „r ' U - 1.,,,rl �j p. _ _ _ ! . � \ 1. -44e. , �G, Miles IA �+I , — ; .-}-•_-•`_ 52 f , I Revised: 512312014 I _. • l 1 I F ... .. ,--=5.` 1 ! *Cl ,N '. - - r _ /t -SEI '� Path: P:14929_SW_Weltl_ExpansionlGlSlLayouts'.Resource Maps t Prime_PamNantl.mxtl t' % ev O7eck ♦ 1 le 1 �• Prmi to W L I r1r ,' � y 1`� �.►- ` ��f.�IF`•t ,i'. ' —.a 1 - J — I - i '• h � — -.r' �'' ' Hudson •i� Q � ,lic S e.�� • ., '' NE e tpic, .ra. _ . ' ! rr , 1 GLAD -1 .1 1 ) - • : i . '„ I. - 7'1_ (}85� 8 ,, . ti + 13,:r. �� W- I . C . umy yr:ioic �..i LEON=AWUFitiRYs t Cok. �� CR=c = Elif ♦' gel ter.! Y5 0 4:,..orefe• oiscaraerii014- . I iu # ' I ecru, iii il__-°Eile_b -I .' ,i - . 7 .- , ) i . , ail X 1 i,., . - , . it '. , *f Ifilia-S__41 * .4 lit.@120 -- . i ., ,.:ffiirt_tilt,,. , . . ]... H 116\I ( gillilli ,44 , ,, , ... .. A'•4� i� � — — CR z CR 3 +Ke�Pl lrou 'may m C Den 7r A ' 1 f'� en. Lochbuie 1 Ijf a / t 1 , - — — — --- C' �NT'Y. ._ `�_r';._ _ "`_ !.? _ TRI -STATE L.- . - — — — -• -- - •- �T68-PWAV•..—.. BABELIN pp��IM� � . - °- N �..� IP v �- I� )�' ADAMS`COUNTY . `e A0100410.0.' •4141 ..,a Kccry rnir _J I / ,Thornton _r Iii, L,rr Brighton , r• I � j\' \Y t L•wlf-r+fr Ereep'l Figure A-19: Prime Farmland �` ■ ■ ■ ■ I_f - -- -� , Iz-; CR52Ai, it19 —;. } r . ii -.4., - - T cc Soil Erodibility - LARIMER COUNTY -- - r II - if% / „ J� r �� l _� WELD c R.50 �COUNTY ' a, r Evans R°3 La:Salle:'031` �` Legend ,./,,, ,,, p I lit li J; n `714. 1 ;yr ,, —� Les en Nrscrrnir ccii �° Iii } �' _ _l:- 1— _. 4�-� '_ _ _ _ - - - I ...,,, — - _ cR 48 IMill L - Study Area.._.I� j Johnstown A •� - 1 New Substation CRas +• _ Milliken cRa6 '- I _ . / I Existing Electric Transmission ��s, rf 0I y / , 1 and Generation O -Bacon 1 • • 'take. I 1 1 lido' •- e, j Y {„ �' (Digitized from NAIP 2013 Aerial) cv _ art. G g2 n ii �I I-. r �, la Substation • , ,L�" v . / • 85� `c�i N-r-sGanal • I , Berthoud t_ su.st.ti•n cRa2 1 J Generation Facility 1-�•� i ,I 1- ;ICI ,N-• i. n �; CR42 CR42 * SJ fr 10 , 1 cR ao ' • (NRCS SSURGO, 2006) •I �Y� r j +/• ,1,� CR 40 CR 40 I LOW :Krf� •- \ ■ O iIri Mead ti ll �, • M 1 • ce . M + _ r, _ _: vie �.. I M 1 I Moderate z' ,t N . ' High O >- AIL 1 ji . . , ki► �L_ e- 3. hilt, " de -. CR36' 0 � ' 1 . 1 • ilillisilll m c • 1 No Data d r I/ n ce • ` !!ikon I h r , YJ • ltltcl•rvuir ' 'Se .- - i tiff ' r 1 - i �`• • mu I z I •'_ = ADAMS AV — I • . '!III - CR=32 . o4 • L_ \ - Mulligan vs`-.q U. t �l t i . :t:= 1 f' ly,ir � Its.) it;.: _ i9 I Q ( 11:S�YIzi .�Z - -_, � � � � _ � � � � � � � � � � � � � I• � � � r - .ttl-sn.k- __ � i Res:, „III _as1 ip--' FT U , 1111iihr am..— = —�; — _ _ $U•st.ti•nO. �s / a + r' —_t CR 28 ) Ii. Calkinsillik � l— a s7jlL j ' °� lake' , -ti• I. 1 -CR 26 - w Firestone .,ti!1 - - I - - - . ,85 - II< I r is ' Longmont — - _ FIRESTONE-BD - ' -- ,,,= tilt SS it ,t - It • 0 25 :�! 1 1 O il Dods 6 LOR--22 • I . -4, ' cro I Z' _7 . _ �. i CR20 - CR 20 It 1 W Golfer I Z v I j; ,, • Substation co— �4 4-". 16` .,- - CR=18- t --r -��. -\ - CR•18— - r - - - - - - - I � , �� —J.M. Imo" cR is , Frederick Sh.f-r Greenhouse ,11: • , 85 ) Substation ' - II ; _ _..i. :,,... . CR14 — — - .-.t0 1 .5 3 0 mid — — — - — — — 1 I{ r4 _ ,, r IlFort Lupton — —' 76 a l i;rrl I I I I I I _ I _ = — — — I lrl ,l, ,ni, Miles _ �� — 52. Revised. 5/23/2014 ' ( en 1 Path: P:14929 SW_Weld_Expansion1GISlLayouts\Resource Maps1Erodibilitymxd cc III tie I II Hudsonr Lulnign5 ›— Dacono ` r fI o o= cc CR10 cc en CO II I Weld County r+ �'/ ..'•LS 85 U !f- - - ,: _ 1 CR=811 o: O I'� LEON A WURL PY CR e r en v 2s Oti e 1 '•� Erie t1, I 7 Q W W I; l, 1' ' I .. __. 76 Q in 11 .✓ .._�, U w J, _! MGR=6 — o CRC 1 - - - - - ce JK, n, CR 6 I f,� -',rosiest Broomfield • . ; tpflioN_ P-Mk ,r; l..:r1r + 0 If, in L I 6 , _. .- - - — CR 4 I - CR4 -- - I(r,r';'i'!„r 70' x , 70 ►• 4 Lochbuie ' ?I * J. O ILI ', ' 7' IIlil:11' I LD TRI- TAT I -..-..-..-.. -.. T�� - - --- •--• WE �CAOUNTY— _— c ; l /, .— : _ —..—..-- — -STATE -168TH-AV- --1BASELINERD -- -. ,' iii iiIF 11r,c•rrnu' C Thorntonit ) i� r Brighton ADAMS COUNTY �wowCantion�uo�.t'` / H—Hi '~'� c Tuwlrtrnt been'i arcente 04,14 Figure A-20: Soil Erodibility Southwest Weld Expansion Project Transmission Routing Study Appendix B : PreliminarySegmentsRoute Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. V • � �' Shafer Greenhouse to Henry Lake F- 8422 5 v amuse= i - • 14TH ST CR 14.5 O I e CR 14.5 ■ � � � � � mekitat - ��2 ��,p Legend • z W �� i LLB~ • e L - Study Area • ..i, a� , Ci'3 C4 A New Substation OD • 14 Q SQL • o tu ' , 1 9TH ST CO RO1r4 CR • S 14 Substation O , = Y 85 _ > / P el J Generation Facility I 6TH STS > -Z _ Route Segment Y 4TH ST 0_Q� w Fort Lupton ,r, Ce 3RD ST �_ _CO - °' 'it cc �=-0 o O Natural Gas Receipt Delivery Point ^ • " s2 - - Existing Transmission L.L o II _ LI 9y- • 115kV Transmission Line i o 9L ` 230kV Transmission Line Z • 230kV DC Transmission Line >• I III�e 0 COvELD COUNTY ROAD 12. in WELD COUNTY ROAD)1�2• �i KAHIL ST CO RD 12.0 • • a o o1.0Z • 230/115kV DC Transmission Line u. N N ii+i,�ial„+ Lateral Ditch I �� 35kV Transmission Line Natural Gas Pipelines (') 4_, I I C Gas Pipeline, Size Unknown I N I i. EAGLE DRZ C ce 6 re N CLARA LEE ST I 1-10" Diameter Gas Pipeline O 1 z "' 11-20" Diameter Gas Pipeline i 1 05 a —m I , 21-30" Diameter Gas Pipeline a oIA. N n pit e- J 0 CR 10 r•', w CR 10 CR 10 Bic I Q-.- -_ a if Burlington Extension Ditch V FAIR LN z /a I W 1 Z -1 850 850 Cl) Y Q V6 I 1 5I 85 I I MI I I CR 8 I I C.O_RD_8 CR.8 CR 8 1 a co o I > I' 1INTOSt v: IN �J¢ 3 a Iw a of I Q N - - • - • • - - - C•-7 M:I _w I W a V FQ I LLitmanlua Hutton+ UilcL I Q C� ~ 0 0.5 1 e • I I I I I I il CO RD 6.25 RD Miles I Revised:6/2272014 II Path:PAb929 SW Wettl Espansion4G4S1Layouts1Reute SectiensCreenhouse Hemytake.mxd 1 _ CR 6 ._y z5 W C'O_RD6 CR6 ''x, is so 4 _te 1.1.11111 I 09 I co a -2 - - • I'• - _' Weld County I I zs _ ce 08 _ U I Lochbuie 1 �! 425 I w £- J I cncr /i j. , { a e 1 4 I lie' 70 I--N enver 0 CR 4 J fl _ 1, 1 f •: •. II. CR_4r__ - a ZANTE WY ' t I b OTRI-STATE rIBrighton • 1 IG.--O•7.-, ..-.1 „n .,.,.. in 4 1 M 400 AV \ JA CI I / t v _ Figure B-1 : Greenhouse Substation to Henry Lake Substation • H Greenhouse to Davis Tap • • � l U i Legend • W _. \ Study Area �' _. New Substation —,1• Substation • � O0 G Generation Facility • ® Route Segment Ce • • I Natural Gas Receipt Delivery Point ^ • I Existing Transmission (� • 115kV Transmission Line • CR 18 230kV Transmission Line Z • (;1 230kV DC Transmission Line • \(� MORRIS AV �� 230/115kV DC Transmission Line • II / 35kV Transmission Line • I DALE AV I Natural Gas Pipelines in • Gas Pipeline. Size Unknown • ( NANCY AV _ 1-10" Diameter Gas Pipeline • II 11 -20" Diameter Gas Pipeline • i , II CAROLINE AV I I 21 -30" Diameter Gas Pipeline • 0. MARY AV y cp. cn LLI V ail LL >< CoTr.) o cc cc cc cc o Q cc O, ` W Dt CASLER ,/ CI LAMB AV , IMII COLEMAN AV COLEMAN AVE 7 W e. cn D4 GOOD AV H' GOOD AVE w Z p' u_ Q LL' --) CR16= CO RD 16 r- - - - - 4 l \ • • , ; • • • i • • ..—f� — 0 0.125 0.25 9 I I Miles 1 I Revises:5/22/2014D5Path;P 14929 SW WeW_Expansinn\GS:laot Is1Rwte Sectlms\Greenhnuse DavIsTap.mxd I 111 ma== l 7 WY d _ �� _ — _ 0 16' 80 NE CO • • Weld County • I o Fort Lupton t • 2s O S •s . i.n G _• • � . Orr w r • • • /i ti D2 .. • -f� Denver " � I.__ uvi / I r • D 3 O . • TRI-STATE carob=swi trt a• 0Assoasbon.Inc Figure B-2 : Greenhouse Substation to Davis Tap CR 30 30 H Platteville I I 4, Davis to Wheeler Lake I U I 85 I , Legend I 1 N 7o I " IL ' Study Area re IN I 0 0 A New Substation tl • 11 I Substation o • P1a,, t ai Generation Facility t • iii. 4 , Route Segment ,/fir, B4 Jv2 1' Gael B18 CR 28, BIM, a" ' O Natural Gas Receipt Delivery Point• -_ v. i ctka7I t ` Substati•n I • B'8 C Natural Gas Processing Plant s Existing Transmission l� • 115kV Transmission Line 'U alli0 8,3CL - - 230kV Transmission Line Z • C .N gn Bti1 N i 620 O 85 B12 • 230kV DC Transmission Line • • 35kV Transmission Line B9 Natural Gas Pipelines CR 26in A CR 26 1 CR 26 ale ' Gas Pipeline, Size Unknown 435......... 66 1-10" Diameter Gas Pipeline Z I 21-30" Diameter Gas Pipeline • Q Meadow Island Ditch Number 2 N • 0- y 2450 2450 P i Most, Davis B 14 Reser•vair X • 1 Number 2 4 it ■ in. _ • • • • CR-24 to l/t1,xe ��• 1 • U) Davis • N Lake CI • • • r • B15. J • W • 2250 \N-N-‘—\\Th l\ F B1` 6 il • l p? B17 • CR 22 -�' per 0 0.25 0.5 l in i • re I I i 0 • o • -V Miles 0 11 Revised:5!2212014 Path:P1W929 SW Weltl Expansion4GIS%Layouts\Reute Sectians1Davis WheelerLake,mxd • • • z5 W • 18 80 • el N 6.7 I t r al d 1 C* J Weld County . 1' • 2020 •- • • 4WL 1 ?6 SO 1 A • 1I 1 D 76 _i CR 20 CR 20 - I 1 - - • • ,j o I I 1 m �o N • Denver O Platte Valley Ditch to • II 7c, • C 1'� QTRI_STATE 0 • 4 I N • CZ V • • t I C.991•1110•and bon Assoca .IinRW10r• • N o • 1850 •L • • • • • • • • , - • • • • 1 • • • 4 L•.lreane Ersrr'carent 4t , Figure B-3: Davis Substation to Wheeler Lake Wheeler Lake to Firestone Tap H lJ Legend W L Study Area O) A New Substation N Q' N. IP Substation o x o 1 Generation Facility ii Route Segment Existing Transmission a 115kV Transmission Line A8 n----4 CR ?/�— • n$Yek•r • 230kV DC Transmission Line Lake � Z 35kV Transmission Line cR�a A9 Natural Gas Pipelines Z61° // O 21 30" Diameter Gas Pipeline u ,will C`n� Yd`�f1kY a . , Suo _t.tf•n A10 • - A3 AktkP LP A6 A•7 Q coo d' 4 U • ■ WI I • • • • • _ _ CRR..2`6 A15 ZINNIA AV C I i CR 26 IMI W • . • ADEN LN l Q. T 0 0.125 0.25 e • y I I I • • • Miles CO fl 1 Revised:5!22!2014 w I I"� Pain:R'14929 SW_WHtl Expansion.GiSlLoyaWs1Route_SecumstWheelerLake_Fireslnre.mxd J W J I J v % r4 7 WY ? o ,e. 8a NE---N- - I— s = w o � `nty _: LL Firestone 1 • A ' • a FIRESTONE BD p,/ CR 24 • • • • • 4-, 7 -rte " Denver O ■ � � ti• � � ti• � � � � It♦ � � It♦ � � It♦ � � I>♦ � � I>♦tx-e. IMP 0 TRI-STATE ul Figure B-4: Wheeler Lake Substation to Firestone Tap N M Greenhouse to Colfer H M Mcr U ;1 • CR22 V �:'i :I Legend ea r 0 17\2 NewStudy SuArbstation I , I. � • Substation O IJ Generation Facility ' 4 , Route Segment Ce • • O Natural Gas Receipt Delivery Point• ^^ M, CR+2o ,,�E�.�� CR 20rit f , CR�E9 e �J Natural Gas Processing Plant Existing Transmission • N. ES E12 • 115kV Transmission Line Z 230kV Transmission Line I _ • • _ • • _ _ • • 3 _ 8JI.u.uuiuup,phlhl% - - - - E6 - - - - Ez1�p. - - ET1t3 • 230kV DC Transmission Line 0 L 4 �— 230/115kV DC Transmission Line 114 c- • 35kV Transmission Line • Colt Natural Gas Pipelines �J Substatio \ • 5THA V CR 18 it • CR 18 C ff �CR 18 T Gas Pipeline, Size Unknown Z MORRIS AV f T AV E 1-10" Diameter Gas Pipeline DALE r5 NANCY AV _ ) 11-20" Diameter Gas Pipeline I— U) ' 21-30" Diameter Gas Pipeline N cn I— 144 . Hudson O Q rr x cc- tz c.) is a O al_ = g 0I ' E4 LAMB AV 3 COLEMAN AV COLEMAN AVE ui GOOD AV I GOOD AVE CR 16- CO RD 16 M_ - - - -— ---- • / U • _NN ' E'3 _ ..Y.....: MI , Sh:f•r Gnn�____JJ�-- \i -4 �\�o vt,<�, c,t,,, la �`''°= E2 r _ _ _ _ _ _ _ _ _ _ . Fort Lupton • ' • 1 • .,�.. I 9TH ST _ CORD14 CR14 � • ' 0 0.25 0.5 r I M I I l e /// v Miles ' V Revised:6/22/2014 ihei,„____, 1 Path:P 4929 SW WHtl EupansionlG4S5LayoutslRoute SectiansCreenhouse Gdlecmxd I E11 I 25 W S -CR,12.5 su WY ,- 52 - - I \ �o ;8 80 NE" �pG*, I O4 Co - ' co X42' Weld County• rx ore x YJ WELD COUNTY ROAD 12 `�' WELD COUN�T�Y.RO�1Di12>, Evf U Q� - M r = A. o ' FIFTH �` _ 0 I Brighton intend Ditch `' t . al � d' • cS' rn U z :- / 2'�Q-� Se 2 I U) 0 W Denver O EAGLE DR W FIRST AVI m *OXTAIL DR DR OTRI-STATE N. aCLARA LEE ST I I 4- AS in WYATTv C9 N, `i' I REre• Figure B-5: Greenhouse Substation to Coffer I Colfer to Rattlesnake H 1 �FL1,4 - -tti sn.k. "` V 1 Ridg Legend Su.s . i.n v W mil F15 L i Study Area New Substation J . F=113 Fi18 � .r.--;---------- a 1 Substation o IG Generation Facility Ic Route Segment Ce IExisting Transmission 1 Unknown Voltage L1- I115kV Transmission Line CR 28 a 0 F121 -� 230kV Transmission Line Z F-1'7 I Natural Gas Pipelines I21 -30" Diameter Gas Pipeline O I IIM I I LP I z CR26 P.I7 I Fs1'6 I Q I st cc I O F 1 1 1 �/ /� 1 I w re,, • CR 24 = E9 MugF8--• I I take Q i I .I cc o I W I F3 � I e CR 22 F-5 _ - - - - - - CR 22 I r 1 • 1 1 • 1 0 0.25 0.5 9 i (1) I Miles • Revised:5/22/2014 I Path:P 14929 SW_WeW_Ez 1w pension\GISILoyoulsRte_SectimsCel!er Rattlesnake.rnxd ' WY W F6 1 0 NE C 20FF2 c CR 204 ins in I , ii Weld County -: I is x I �' II M • c.> , '`' T I r 7O a/ Denver O CR 1s suss . i•n� 35TH AV cRls TRI—STATE • • • _ _ - _ 'Hudson • - • I , O G•hwtnn Assoosi rsnvrrwor ca.Figure B-6 : Colfer Substation to Rattlesnake Ridge I ( r Ln I CR42 CR42 Rattlesnake Ridge to Neres 1 I 1 Substati.n I C...)1 I 1 Legend _ in 1 G 1 5 1 M Study Area Tr I I New Substation re o I G14 I Substation o II 6 Generation Facility 1 t; 1 ® Route Segment Ce `n CR 40 v_ vCR40 1 G-1�3 — G I Natural Gas Pipelines ^ II 21 -30" Diameter Gas Pipeline u- 1 G10 G11 I I I z I ��G8 G9� I I I O I I to I I en t� CR 38 I CR 38 0 1 U, ce I I I n z rz I G6 G7 " 1 Q I 1 I I 0 I I X I o I U I 36 I LU I II /R I CI I I I 1 �I I3450 _ I \ I 1 1 W 1 1 1 I G`2 1 I Tr 3 I ll Milton I 1 0 0.25 0.5 e Reservoir I 1 I I U) I Miles Revises:5/22/2014 I 1 Path:P 14929 SW-WeW_ExpansionkGIS%Layouts\Reute SectiamIRateesnake_Neres mxd 1111 1i/ 7 WY 118. .80 NE I I Co I I I Weld County IJCR 32 I Iz5 I ' 76 . . - ---- I I G1 1 Box'Elder Creb I I MI I I -it Denver 70.1'...\ 0 . IRattlesnake I \ O -idge __ TRI-STATE I Su°s ' I°n I . J *nmmwr Aitgp{ppn.IM i ♦tithe,re Frx.r.'G.rrrrnt 7 hi Figure B-7 : Rattlesnake Ridge Substation to Neres Canal Subsation SI ►South u 1 Neres Canal to South Kersey II I U al H21 I Legend � CR50 CR50 H119 1 � Study Area ' New Substation H24 ' Ill Substation 1 0 Ial Generation Facility N. ' ii Route Segment a f I Natural Gas Pipelines H23 1 H20 I I 21-30" Diameter Gas Pipeline I � z "U- I OVH22 CR 48� � I ' n I in H18 I re o in co z to tocc cc I U 0 I I I CR46icb H12 cRas H1:6 segas• H1�70✓ I Iw 1 N i III CI N. H13 H14 ma- ce W O H11 I I I CR44 H1t5 • H-1�0 — I �, H22 in I 0 0.25 0.5 I 1 i I 0 Miles 0 I Revised:5(22/2014 H9Path:P:14929_SW Weld Expansion\GIS1Layouts%Route Sectlana\Neres SouchKersey mxo ao hi, T. WY 1110111 W � 1 H'4to el HH8 co re 0 I H7 ' I. 78 Weld County 25 H6 I 1 p ' 7 H5 CR 42 I cRa2 H3 m '° H1 ® - nver IO \N. Substation I 0 TRI-STATE O (nation and onitvanv,,.wr I '. Lath..,a Fr.ny+'t agratis Attie Figure B-8: Neres Canal Subsation to South Kersey Substation Southwest Weld Expansion Project Transmission Routing Study Appendix C : Alternative Routes Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. N I l4 � GSM N Gr - - nh • us - t • H - nryL . k - 85 W Sh.f r Greenhouse I es II Substation V v CR 14.5 14TH ST U CR 14.5 O Legend i l a w in z a a 0L III Study Area 2 LL > a, I y q .X New Substation Ia > � �� C1 • o,4 a Q • tu � PS � 9TH ST 1 1 CO RD.14 CR 14 Substation O I ■r ■-2 a a i J Generation Facility Delivery Point!E5TIs11__s T 0 a w Fort Lupton ,n�� w m C7; Existing Transmission a : o ^^ ___-- ce et O — _ -- _ - - -- s - - _ _ _ - - - - _ _ _ - - - _ • � 115kV Transmission Line 9y,- .. —4w— 230kV Transmission Line i 9` • 230kV DC Transmission Line Z i z■=mot: : 230/115kV DC Transmission Line e ti in KAHIL ST CO RD 12.0 WELD COUNTY ROAD 12 en WELD COUNTY ROAD)1y2� O • a z 35kV Transmission Line iU. N N I Natural Gas Pipelines Thigh+uu Lateral )>ircA Size Unknown Us) 1 Gas Pipeline, I1-10" Diameter Gas Pipeline N EAGLE DR a I CL N CLARA LEE ST I 11-20" Diameter Gas Pipeline o I �� o r) = I 21-30" Diameter Gas Pipeline C • r` s I 1 � LL —m 1 Preliminary Transmission Routes Q I ri N 1 0_ hj1 II , Route 1 Bic CR 10 M W CR 10 CR 10 I Alternative ` ' lfst Burlington Extension Ditch X FAIR LN I a Eliminated From Further Consideration Lrf ' W I �r Z 1 850 (1 850 to 1 y+, I WY 85 I 1 ki O `- I I I W CR 8 C.O_RD_8 C ' = CR 8 1 I � ?Q L 1 I > > 40 I �: I y "PINTO ST a Lai 3 a 1 --t I W N v+ + I I = a a M II I o U ,�, a w I w Lupton Bottum Ditch I I I 0 0.5 1 e p CO RD 6.25 RD I I I I I I Revised:5/23/2014 Miles 1 I Path:P 4929 SW Weltl Espansion4GiS\LayoutslReutingStudylRouteMapskGreenhouse-HenryLake.rnxd 1 CR 6 y 2-iW C''O_RD6 CR6 so I is so m, . ..f_i 1I a C 0 i 1 I I Weld County z'. 1 iv) 1 ./ s.- . I. 76 I 3 Lochbuie I 425isi 1 ca n �f u m 1 �0 Denver 7U a CR4 — _ II►�' CR4 - O _U - yZANTE WY I b TRI—STATE Brighton 1 I /157 IM Opt AV �%` Figure C-1 : Greenhouse Substation to Henry Lake Substation • Greenhouse to Davis Tap • l.). 4 • • • 41 • 4 • • • - Legend L 2 Study Area I A New Substation Substation cc 0 O ai Generation Facility Natural Gas Receipt Delivery Point Ce 0 • Existing Transmission , -- • —•— 115kV Transmission Line • 230kV Transmission Line • CR 18 •— 230kV DC Transmission Line Z MORRIS AV \ D 7 :::: sL:n:sion Line O Natural Gas Pipelines , DALE AV i Gas Pipeline, Size Unknown ^ 1-10" Diameter Gas Pipeline V • NANCY AV 11-20" Diameter Gas Pipeline Z 21-30" Diameter Gas Pipeline CAROLINE AV Preliminary Transmission Routes • C ) Route 1 (5) a. m y i- MARY AV 0 Alternative (2) cr) U. LL X cc o et z 4 0 U re V z = O W D . CASLER CI r, LAMB AV IMII NI COLEMAN AV , COLEMAN AVE W III i- I II GOOD AV Ht GOOD AVE w D Z CI UV CR16 CO RD 16 r . _ — _ _ I l ■ • • • • 1 0 0.125 0.25 . ,.r I I I 9 �' r�'�7— Miles CIO RevheE:5123!2014 D5Path:P14929 SW_WHd ExpanalonketS5Layouts1RwtlngStudyyRouteMapMGreenhouse_DavieTap.mxd _ iii; 25_ _. Milliell W no. 8° a J.M. Sh.f•r Co El Weld County • e.. r ilmGreenhouseCI Fort Lupton zs O Su.s . I.n O — =a _i 9.4 M / ii D • D3 Denver ' O f TRI-STATE 0 Cs..ot.on man( Aaoo.o•n.l..( ik Tt..h.a. t r....-/c..f.,-h, Om Figure C-2: Greenhouse Substation to Davis Tap - I CR30 30 Davis to Wheeler Lake I I Platteville I I t i 85 Legend N X73 I '" I 1 Study Area re U IN I 0 New Substation I tl • 1 I Substation 0 G Generation Facility t � • Natural Gas Receipt Delivery Point 11 r..•••2 Backer Ditch ` CR 28• 6410 B18 • Natural Gas Processing Plant substati•n i Existing Transmission • % B8 . -- 115kV Transmission Line • 1 • M; z • \ l _ - .. 230kV Transmission Line U a B3 4 s \ . • 11 • • 230kV DC Transmission Line N N B20 35kV Transmission Line O ' 85 B1►2 Natural Gas Pipelines • B9 I Gas Pipeline, Size Unknown CR 26 CR 26 1 CR 26 a 1-10" Diameter Gas Pipeline 21 -30" Diameter Gas Pipeline Z S Preliminary Transmission Routes • �, Meadow Island Ditch .Number ' i04 Itn 1 • N\ _ C } _ Alternative y 2450 2450 0_ 'i e♦' ose Davis '• XEliminated From Further Consideration ill , i Reservoir X • Number 2 ■ <r W • ‘ \ • • • CR-24 _ li ' l/H't -- 3I - �— e • 1O t)ari\ I N Lake CI • • • • M I • 9 • B15 —1 I • • 2250 • - • i Il • ' ' = 17 I CR 22 —1.-- l • to N • x Dab ,y. 0 0.25 0.5 • I I I 0 Miles • '—1 Revised:5/2312014 Path:P1W929 SW_Wdd Expansion\GIS1Layouts\RoutingStudy5RouteMapalDavls WheelerLake.mxd • • z W - •• • SD IMIMIIIII • • Y 18 80 B7la 1 CO i Weld County • r 202o I z5 • ' WL •' el —, SO • 1 • CR 20 I CR 20 _ ) ii I • I ' c.; '� m Denver 70 N • Platte Valley Ditch • • O �+ • ,l U N I • OTRI—STATE ce I • l ws.=..•r•rrrnw,t a r ce • 1 f c avraoo•ooa.kW • I 1850 • - 4 Taiwan Er4+e�.'C•re-,rn< 7(.111 • ie • • • • • • • • iii • . • • _ • Figure C-3: Davis Substation to Wheeler Lake Wheeler Lake to Firestone Tap H U Legend L W Study Area A New Substation N ce o Substation ce 2J Generation Facility . Existing Transmission Ce • —o- 115kV Transmission Line • ' 230kV DC Transmission Line ' • ,\ CR ?� __- — --0 • Wheeler 35kV Transmission Line Lake �N. • Natural Gas Pipelines Z X28 21 -30" Diameter Gas Pipeline '153s> Preliminary Transmission Routes O Suo _t.ti•n Route 1 A10 - '�11 1 Alternative in Eliminated From Further Consideration A3 Z A6 , � 0 CO LO • 41 CL o cc • U X • • WI I • • • • • • • CR.26 1 Q A5 ZINNIA AV �� CR 26 1 // IMI W • ♦ / • • ADEN LN • Q , _ l k 0 0.125 0.25 0 • y I I I I ) Miles I- FA I . r Revised:5/23/2014 (A N Path;P 14929 SW Weltl ExpansinnkGIS1Loyouls1ReutingStudy1RouteMaps\WeeelerLake Firestone awl W J CO M Q WY U i 0 Z of • 18, ao NE f CO • z • Weld County O LL 425 ' Firestone I • is -_ 76 FIRESTONE BD CR 24 • • • • • + -rte Denver " N O ■ _ BM • TRI-STATE o ' _. G•� A.,Q a oanvrrww .�1.Inc AOWw6 Figure C-4: Wheeler Lake Substation to Firestone Tap M Greenhouse to Colfer H n M U firt,N CR 22 V -I Legend IJ Study Area New f at , 0 Li.t.." I , Substation Substation O IJ Generation Facility MI O Natural Gas Receipt Delivery Point f NIA - I • ® Natural Gas Processing Plant • /�E�, \ CL • CR 20��/ - '�- CR 20 — • Existing Transmission M, c 115kV Transmission Line • E8 RE 230kV Transmission Line Z • 230kV DC Transmission Line • tr _ • • • _ • . . • _ j � . E� 1 E�� if • 230/115kV DC Transmission Line O - 35kV Transmission Line * O' E 4 Natural Gas Pipelines I ^1 Golfer Gas Pipeline, Size Unknown v • t- _ u.st.tion0\ CR 18 CR 8 _r-CR-18 r 35TH AV l 1-10" Diameter Gas Pipeline Z -__-- MORRIS AVry \ 11-20" Diameter Gas Pipeline _--- DALE AV - NANCY AV 21-30" Diameter Gas Pipeline N H . Preliminary Transmission Routes a H O N 1A—= CO • f t Hudson O a cr w CO x -z a—q re v '' Route 1 ' —_ � �'_ = 3 < Alternative X LAMB AV ' ' ' Eliminated From Further Consideration CO IEMAN AIV COLEMAN AVE w GOOD AV i GOOD AVE ^' CR 16 -_-_ CO RD 6 I - �' 1 �� 0�, .a,r _1 E3 O ��, Sh. -r G ® k• MI Ac 11n 11ll95tition o r \<,< , can: W W Fort Lupton ' 1 Nol I 9TH ST CORD14 CR14 CR14 ll - ' 0.25 0.5/i' I M 0 " Miles in ' V Revised:6,23/2014 \ Path:P14929 SW Wettl ExpansionlGtSlLayouts1RoutingStudyiRouteMapakGreenhouse Cotler mad 4 I 25 W ^,, - - CR 12.5 �' so 18 80 % I \ ,,� i Weld County • ' rx o, \J 25 WELD COUNTY ROAD 12 M WELD COUNTY ROA1Dr12>_ gra L) v r U JFIcAt-=-=- - 76o Brighton Lateral Ditch I 7G Q� �`�� N V = CO 0 �r a m a-� 2 ' .J_W Denver '° O W U W EAGLE DR I w FIRST AVI m N OXTAIL JJD TDR TRI-STATE CLARA LEE ST ' r ii- �O� Car�,..�e ra,wfnwor ,n WYATTv C7 '``w and I f IRE*\+ Taileb etbe.e+'c..rent St), Figure C-5: Greenhouse Substation to Coffer I Colfer to Rattlesnake Ridge H 1 kJ F14 R-ttl •sn•k= v 1 Ridg _ ` Legend Su=s i.n v W F15 y1 Study Area MN CR 30 New Substation `✓ �� ti � � � � � � � � � � � • i = = F1�3� F1/8 I IN Substation o IGeneration Facility ( i I I Existing Transmission I Unknown Voltage Ce 0. I 115kV Transmission Line M / I 230kV Transmission Line 1 cR 28 F1 0 F12z F17 I Natural Gas Pipelines I 21-30" Diameter Gas Pipeline O I Preliminary Transmission Routes 1 < , Route 1 < < Alternative 1 Ln I Eliminated From Further Consideration CR26 4Ic PU I Z `FA6 I I Q a, I w I0 POil 1 I I al • • CR24 - - - • • • __ F9 • - •S - • • • • fj 1 • ♦ i • - • _ • {. •I..Je _ --is •1 • • •O' • a ....b • . •� •N ♦i • te to ;• L ip• °• CI Lalihke I F8• - • c7,k, I .I ( cc 0 I W I F3 I CR22 ,ffe• t - - , CR22 I I I I- 1 0 0.25 0.5 0 I I Miles N Revised:5!2312014 IPath:P 14929 SW-Wed_Expansion\GtS%Layouts1ReutingStudy1RouteMapalCotter_Rattlesnake.mxd z 7 WY110.111 W F • I ,6 80 Illa C zo F2 F ' • cR 20 in CO 1 U cc imisWeld 1 25x I1 F1 Al D LC)• • • • • • • • • _ _ • • • • o Syr, .O -1 f`ul << . 1• • 1Denver� O C 1S Suss . ian�, 35TH AV CR�8 TRH—STATE _ _ • _ • • 1Hudson • • • 1 caution and IT:. A•W W60n. Figure C-6: Colter Substation to Rattlesnake Ridge CR42 U CR42 Rattlesnake Ridge to Neres 1 >I ( ill) I 1 Substatien 1 I U I 1 Legend I 1 I Study Area l.1.1 II New Substation 1 I G1 , I Substation cD 1 I G Generation Facility 1 i 1 Natural Gas Pipelines Ce en I CR40 re G13 CR40 U I p re 21 -30" Diameter Gas Pipeline U 1 I Preliminary Transmission Routes I G100 G,11 I c Route 1 Ii 1 r i Alternative Z IG8 ��G ' I Eliminated From Further Consideration I 1 Q I I I 1 in M 1 CR 38 I CR 38 ce v U in I I Z I I` I I G . G7 3 1 U I 1 I \ I 0. I I X I 0 I U I 1 LU 1 U it G5 X 36 I I I CI I I 1 IMI I3450 iI \ I I G4 I Lill I I I 1 I In _ CR34L1 I In I Wt G3 I I— Milton 1 1 0 0.25 0.5 I 0 Reservoir I `1 I I N Revised:5!2712014 Miles I I Path:Pi4929 SW_WNU_Expansion.Gs)Laouls1ReutingSmCy1RouteMaps1Rattksrake Neres.mze // 80 7 WYW I 1 181 so NE---N- I 1 Co I I Weld County I %R 32 I 25 I I 't 0 76 I Box Elder Creb I I cl 1 II '-ft Denver 70.1'...\ IRattlesnake I O -idke __ TRI-STATE I I . canintionAao and OsnvnKtpr Aitgp{ppn•IM (1) i ♦Towhee,re F,..r.'(..r e rn< 4.tTJ Figure C-7 : Rattlesnake Ridge Substation to Neres Canal Subsation MI H m‘.-..,South 1 Neres Canal to South Kersey I I o U I Legend CR 50 1 k CR 50 I L 1 Study Area W II New Substation H24 I II Substation I I 0 I al Generation Facility 1 Natural Gas Pipelines LL fl 21-30" Diameter Gas Pipeline 0 1 Preliminary Transmission Routes H2O 1 1 Route 1 (9) I 1 1 Alternative (9) Z I Eliminated From Further Consideration (6) , -----.... ( CR 48 e. H22 0 I I H10 I Ce I z M tO It) U U CC I I I I 7 A I >C CR 46 H12 N, CR 46 1 in 1 1 I p SI H1 � I ma- cc 1 W O H11 I I I CR 4,j____-- 43C_ • , ___H1.0---......_eI �, I 0 0.25 0.5 I I iI O Miles 1 Revised:5123/2014 H^ Path:P:14929_SW Weld ExpansionlGIS1Layouts%RoutingSWdy1RouteMaps\Neres SouthKersey.mxd y I 'KT . WY W I 18 H4 H8 cc U 1 Co_________€_ I Weld County \ I I 25 LH6 5 I CI 76 I CR 42CtbllCM %\ Q; CR 42 I I70 c - nver 70 ores C�G1E➢ O \v Substation I 0 QTRI_STATE CY c.nnaten a'4 tearrvrivu,r UI M.ocuia Int • Figure C-8: Neres Canal Subsation to South Kersey Substation Southwest Weld Expansion Project Transmission Routing Study Appendix D : Sheet Maps Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. it Index Map H 1 4. j`_- fi• I fi• fi• f1• fi• r7 7[ i t„,r _. - • as LARIMER COUNTY ,,, '�25 t �, i , f WELD 'COUNTY •• •• �, Evans Rae Lasalle OCR.5: Legend — I' rr� • �G I- Lower Reervoir whar N_ . . Oil and Gas Wells ,.., I� - - ' Lin,, CR48J ' L . StudCation ActiWell New Temporarily Abandoned CR 46 liken r CR-4s -- - Route 1 • . MII �— ' — I y Unknown I \ ,t ' /' i ' Alternative O al", • ' I 0 Eliminated From I Other Oil and Gas Facility cc „� — — up r CR_aaI __ Further Consideration Oil and Gas Well " I 200ft Buffer f I . rt - 85 N r' s�G•n.l i Existing Transmission Structures, Schools, NRHP _J- CR 42 1 • / CR 42 �tl ° " �CR-a2= INI Substation E^ �' Be`ithoud' ;; Gilcrest.' �_ j ❑ Residential L� 1 JO a ; I;i, It<L CC CC [al Generation Facility ❑ Other o :� U UI 34.5kV Transmission Line CR 40 CR 40 -I-- CR40 CR 40 c : School z -,0 d I 115kV Transmission Line f Historic Place Z 1 Mead �! -I III' } M , M en 230kV Transmission Line Center Pivot o eR 3s X in 0-- ' X ' ■ 230kV Double-Circuit 0I on t% N Subdivision O r U ' Transmission Line cri ■ 230kV/115kV Double-Circuit Residence 75ft Buffer c� 4' cn ' Transmission Line ■ ■ • �L at' • • • • • *-- 67,-4-77-4r\ J N1 � Existing Natural Gas Mines CR-34 « `°`i'"" j un Processing Plant Active / Ln •_',� ' 11-20" Diameter E Inactive "aAt if re (..) L In a is • J 1 Application Withdrawn, z • ADAMS AV Ilrrrnur's • - _ _ �� _ =CR=32 - - ,� - - ' Transportation ® Denied, Revoked a5 • I or Terminated • • +r,ru,,«,r T ' = Private Airport �Re,c•r „„ 1 • — __.66 , _' - - - - - - f>• f1. 11• fi• fi• w 1 fi• f1• it• ■ • fi• it _ _ —L__ _ it• i © Heliport Water Wells Y or �' I II I •„.....„--, Application Denied, • • • u • • • u d Hydrology Unacceptable, or Withdrawn Rc.unw , cR z8 ,. ' 4 ' Probable Playa ê Permit Canceled or Expired t ,ll.r,:, ' WI'tee. , ake 1 /-rfi 0 J..Substatio raga" `'`�C �-\ ' - — NWI Wetland Permit Issued or Extended X Longmont I ° — !! s-• r ' . Well Abandoned I ej;zs FCC Well Constructed Firestone s5I. ' I • E3 Communication Facility Unknown I �- --�- r 1-__-�- -�='119 • Oil - - STONibis( irD� • • r _ • 1 • • Sep ! �• ! �� ♦ O O °� ,- toi f • • I Jurisdiction 0 . i • \ ,, • —CR 2r—n2 L 4 --..;=. Municipality _ • d I • ///1 / • 1 • I I / / ,l Denver Water Board MI cc Liu_? '' cR 20 1� u = G ' ��j-- 1 I CR 20 State Land Board W 1I1 r'" • I • • - `-ter' - I °If•r I « Z v 1� Su°st.ti.n I I Qy J I - =CRs18 f, I - V v "_,� _ _ —CR.18- :7 7 4... UH ❑ K enesburg cli N _ c� / Hudson [ (/ •- N I , I. A �'. Frederick • • L— o = �� - ✓' CR 1s D. • d « Sh.f•r Gre•tili.M s• o _ } « .stiti•n - I 0 � � �, •. 0 1 .5 3 _ _ _ h r ---_ I m, ., w ■• I I I I I 0 Fort Lupton < ci LMiles (1) I }— I ` — — — �--�f— 52_ II 7 Revised: 5/29/2014 en \ '�Oe — •• i _ -i. Path: P:14929_SW_Weld_ExpansionlGlSlLayouts1RoubngStudy\Sheetmapsllndex_Map.mxd I 40ii . w d' I •, � 25 W I f I I CD lid,ao L\ .1ao Erie • C I, r w v •• CS tr • • ■ -• • • i .,,11- . I I 0 CC - v 0 CR10 M : `•+'Dacono .r ' .. 0 a CO CC M \1 =� J Weld County �D j =LEON=A=WURL=PY = •_-___. CR 8 yi 1 CR=8 ce • ccc NN 25. I CJ w * • • I 0. .. N. � 0 •• • U z J V 76 • •rIll • CR-6�1 _ — -i o CR • e CC • r i iii ..l.tc . 1 Broomfield i �� I Proved 7s " I • .CRI4• - - CR4 ••'•� Reserrnir 70 Denver 70 " f1 • Ochbuie 'lb . I _ x CI ' (reel, TR I TA 168TH•AV----- 85 Lunwr.7.7npanieje EHors WELDCOUNTY - 5 TE �"� -. •-_-._.._----•�.168THAV—•- --I'----� —.._- .._. „k�: _ I • . r. At - — -- —�le�irrn�r•• ADAMStCOUNTY Thornton � t +� Brighton I" IT - k# / I II Figure D-1 : Sheet Map Index ` -Jr. ,.y� . • V s —... - , � Sheet #1 t et Silir— sas: . ' . - b. 44 '16. s U --• ' _ - - - - - -_- - ; — -CR20 i - " i) it . I it I , �•'' Legend I rti t - 4t r " ` -t (SeeL index map for complete list of legend items) ' ' I • . I . t -t 1 W , ( , , , , , ,_ Study Area en 1 ., s New Substation ...— r,A. AI I r o „ Sili, L I t • , Route 1 0 i ` V 40 -- • 1 ' 4 — s 7. . . ____ _ ;_r_.;* ,,‘ i, • ' Alternative ' . S te, e S• ._ _rillEliminated From Further Consideration ;Ilk i -- " - 1' _ - •, i + ' �j' it � � 1001 Existing Electric Transmission rfri - r - - — E.• and Generation _ �_«� ��ar to (Digitized from NAIP 2013 Aerial) ra I •• • hi. + Substation a lik• ' -a 'f G Generation Facility • f. �. f 34.5kV Transmission Line illt • 115kV Transmission Line • taLif, I I - .■. .■.� ` • — ina ��_ i4 t-' r 230kV Transmission Line w K• R • if 40 �: { ti .w.�., r R • ' ■ -. 0 a 230kV Double Circuit Transmission Line t. Ap 4 i,...-• li cry."' -IIIIIIC..q..r Pr R: • - _ J 1+$ — .._ •--�• 230kV/115kV Double-Circuit Transmission Line 'GR-18 t . a_,7 71 f _ Existing Natural asInfrastructure J . �� _ :MORRIS .a v. I 1 f _ • .• -• t . �' S - ❑ ❑ ❑ J J 2 r ❑ • : e11. _ r - - L.— •' 'I (Ventyx 2013) • — . - - • ---4- n * lik 751.- �_4P • _� .. =f 0 0 I oµ �` _. ❑ . 4,1 I e' _w _ M 1� - , d•—•••••"IF Receipt Delivery Point or Processing Plant ,.i r I !, l _ t » ,�` ,. • lir - . -- , , 0 i _ L, _i D. - '15 1 mPlaT cr. i . W= :f ,..._1_-_--$ 11 -20" Diameter 1. 3 I J c iit . it la • ' "..". a.....i 4 X 0 (=ii - ■ L ❑ 0 Q , L .. j it ai • Y_ ., i ., pi' \4%❑' ❑ • Crt7 1 Mt:: - AV' ". .tot 0D , IP __ Iii 0 O___, .7 • rzx- El . ' •J , , .mot 7 • O li • iS ' . ‘ - n 1, r J J C I. T\ •-. . ." .1.,J -,-'� LAMB AV 1=: i rte--• �... �tJ. s ❑_ 3 _Q _ W t� . - _ - a:._... a.- COLEMAN'AV _-.,. _ - oLEMAN •V3 7-1--I O ❑ J J -I Li U O -1.. J J - i ' O 0 , J _ O Et ,. N . 4- - i J J ❑ Si, 1 J y - E. O J D . "•,1 - 1' �. _ • 1� *---- - _ p GOOD AV - y .ri - G000.. 0 1 I , s�• re o -I ] ❑ ] I 'I I J U - • - irrilei g - _ 0 w �-- -1 ❑ Q`r,� J ❑ J- J J J O .❑ ,❑ : w v.- . « I _ Afar — n - — _ _ :r V■ s; '-.c ._ g-ja In COrRD -CO RD 16 �.4c.r ....._......4.2- S� +�u�r _� £3 E t -t—T'_ _ Mtn_— ] 1 IIMI —� , s • '� • y II: a >j/' . 0 0.175 0.35 Iel. a w .k. Da .',»g , -- ~-• •J` e '1. Miles _._to 1 • - , ktt - - PO- 0 �. Revised:5/28/2074 1 Path: P:14929_SW ExpansanlGlSlLayoutslRoutingStudylSheetmapslSheetrnaps.mxd ,_ , , ... . _ �+ W ilti 0 @ra in, . _ _ . _ . .1 ,..4 if,),3, Rte`1:? ,): .ti_ i ,.. _ re 4. .... *„.., :Fort Lupton , /I y it ��I •C) I 19- ta; - _._ ar .a :. / . sr - .411 all• o / 1/-:'E1=D:1 C.1;0. D2 _ D:' -• z " _ s f / I - , Ili III • (11 0 ..� • , .. • Fort Lupton — r I 4 0 _ ; - til*Hiti • ` �'�� i c . �II- 1-Jr, TRI -STATE \IS ,a--Asiochi.s..., ..-t.on, ,,,,,,,i,...„..,- •.` ir- 4." ' e t- met _AIS: : •- - •� i '-.7..\" t �•, a }lam a ....1 T...F..•.<,<Fr ,•� ,.,orn< ifetrt A N Figure D-2 : Sheet Map 1 oAK:ST ii.• ■ 2-- --1 !_ w✓: I i . q-r,-� �H�E� �S' • , �Q ♦ ° .r-- .....m..... T. Sheet #2 I— ' • o` m T.�n = l Ital. r�7 , r = " le1S JD 3 pl� � ; s. �'°� `' „hp ' � ■ ; Legend n a -< �-1 C Zo ❑ ❑ ' ' I �I ❑ 9TH ST •C s , + T �� (See index map for complete list of legend items)o ❑ /Ills.. . I� ,, .' r y, i Study Area 0 4 _;:al,......H! .., , .• ❑3 ( 1.40„ I -- i • " _ - . Y New Substation _�l!, i O 5 lip: I ill 1 - • 7.1] Fort Lupton IIIIIIH7.. y , toil '' ��4116. ' ' Route 1 ED E3 n a e rnh ❑ ;10• —i . ' ::• I . Alternative �/ • �F 7 I ..ft - Eliminated From Further Consideration a �4, REEK DR J ❑ ,� -is?lig? la. - A ° u? aik -ail '~ O° o • -4.-4... E14 • ` ; ,, Existing Electric Transmission • ' _ e' ; . _.1._ -11!"1 • • b . ■ J and Generation _, - _ _ -i�s�.-.1 .---i -� �r - - 52 _ VI �- — — _ (Digitizedfrom NAIP 2013Aerial)_ .$x' _� � a: iQ ■ i +.� ` Substationet% tip JJI73 ❑ CIO ❑ 3d • ! , — - t - iii _ .t , i' 'girl O ❑ ❑❑ SIL�LERADOJ JN ,11, _ �+ r -` .�• `<,.,' 34.5kV Transmission Line r } ❑ a- . i - - . - \ - t ] ] � 1 . � ■, . •} ■1•+r.• \ 115kV Transmission Line t '` ••2 am.:.„ . ` • ,'; IJ 'T �� +r ft ° `` 230kV Transmission Linemis t I ip 1 4. ii -a / d �'• , ■ f ; • �• - ��t N 230kV Double Circuit Transmission Line _ 1 ' 1- :f -,:J -',ice =i1 230kV/115kV Double Circuit Transmission Line =,♦ .. RI _ WELD COUNTY Ri * CO3RD 12:0 ` _ .. .: �- �_ I • v ,�r P .', • a ,fit , • : >• •� LV , r, .;,,5 • . � Existing Natural Gas Infrastructure h �\5 ■ .. ~ .r. L •� � . (L ; (Ventyx 2013) i .�4 / • . r _�� a•+ . -' ,t 1 Receipt Delivery Point or Processing Plant• se . -4.2 ' r IS . lia .. 11 -20" Diameter I . a - rysilint, itif • . _,. . ,. ., ) • 'IN , • a • d - - y *6 C $ PL'<i a - EAGLE DR � . . i Asa _ I ❑ �. M h y � ^ - I r - ti`s, ( '1. �, • «• r • ( i I r . ai u o E I CI • • 's ■ • �r ( '"�'� t WREN s , .. ,, qc:i l •a .S P. f •I . aq _ jt .- , a4b .„ W _ • �, u� ■.•• � „motel ti W Are, t - _ - . I )• • .Q. ' + �M LL . a - . � �jam, ' _ , r 1� - ;�- ' _ - • - • - I• ' 1 ad • Jews. _ 1' ,.-. ._W• ti' "•+��' - � '"•. ems__ '� +f- • r.. - r - 1 S — 1 ♦• i . ,,- •>a+ , " ;1ft t • 0 0.175 0.35 RI., • S. ik >+ Y / (") % • : Miles - . • 4 • IIn . I Revised:5/28/2014 - Path: P:14929 SW Weld ExpansioniGIS\LayoutslRoulingStudy\Sheetmaps\Sheehnaps.mxd i, _ W ' , l - - ! 'sits ` -v ❑ Fort Lupton 1 L .N 1 ,e- hIs 72 • 110,•-r 11 k kalf • -• , _Jr • I., \ i 1 ik II!Ill • . I . � , I r7,i . F. ..„... V y i • . (r . i_ r, �� .c. ,,, Lochbuie••• , 2 0 I ali Is I 4: C i — %Dime lita � t , �. I , f-SRI -STAT E — ` moisFigure D-3 : Sheet Map 2 - - -- - - Sheet #3 • i - . . U 0 I 3 0 p• tte% st .° .! Legend ! - el. r s y - . , ' . (SeeL index map for complete list of legend items) ' , t • oo Uo_ - • .ter. -....- C 3O - - �-.r - . CR.8 -- 1 1 1 . - i ❑ 4_ Study Area•�— t�� \\\ - iF �� - w ::srtion rrmmelar t. • • sb • —, i I D IFiFi O I r„�,• _I i �J II ❑ Alternative:40_ _ 1>R`• Reservoir t � . ► ❑ �� - a • K , , t' '• Eliminated From Further Consideration !Y . : +• Number • • ' ' Ca L: t' t `�_ ; jiii • �. ._: : , /, r i • Existing Electric Transmission W _ •• Ii and Generation ,r , . - - w r. _ - '' (Digitized from NAIP 2013 Aerial) t if alillir Substation / • I I. _ L, . 1 <; Generation F ilit �.�� \ ,, _ �' a � o n. Facility ' / - - • • -- 34.5kV Transmission Line O_ _ _ ta-ilihr-- 115kV Transmission Line • 4. ' 230kV Transmission Line'A 0010.0011' _ —_,, ' R s,rvorr 1 .11157017 k"�7 all liAla II I! . 230kV Double-Circuit Transmission Line .s : r, tlk • 1 ,!: 230kV/115kV Double Circuit Transmission Line IF-4 s �_ �} Mg r 'Oa- th - � - Existing Natural Gas Infrastructure tea-• _ C:1141.11R'6 . _ 11 /r. y, .� M h (Ventyx 2013) __Brighton ,. - I - i', • ! re • - Receipt Delivery Point or Processing Plant • . '` . ._ el + f 11 -20" Diameter +i9 . 7iiii.illir _•� i 1 ik . -if ri).7, _ILA:r 114041.8. IS K. ,..,! da. il so _ ' a/ws: i . \ . \ ' . . . IIIP /1 ,r Ecr leak . • t Ii - M - eat. ,4 a o, - - Her ,� • ' • .t 'Ire.,.". �'f_ 1 k' Lak . . �_.- -_. • r - . _•, , a , } „fit, gg e i tf 41 y ' — — C'�. �. �t F r r -- — ❑ ❑ 0 0.175 0.35 0"ror • .'L, ■,, � f. • , 1- ❑ Miles 0 1 ❑ ❑ Revised:5/28/2014. , Alk 1, , •- - ❑❑ — Path: P:14929 SW Weld ExpansbnlGlStayouts1RoutingStudylSheetmaps1Sheebnaps.mxd =t: W • PIjii • 112 Imo. .6 i — --- lit) a ❑ �� , lel/. , '_ f.�� 1 Sib- , 4 • rillillie + ❑ - • el Lochbuie0 • . Ip - i , 0 0 3( Ncrtur I _ + s 7 .❑ I�al Ule n r, t nit 0 7 ST. B 31 �� . Awnet � - ] 0 ] Hg 37:t ' '��4 I ji g —fit r ® _ �J �',f� _ �� Brighton• IL), ❑ ❑ . ❑ JA DE AV = i i f t❑ �w �w �P . g ''1 \-74 --;: a i At t i ❑ ❑ > I.JtiE.ATITE-LN • r3_ _ W, -2g- Pend Z B O 3 c �co w • al ❑� N-., TA _ -r TRI -STATE 1 • ! .� - Q ill_ _ �I�, It OACH-O Z PRAIRIE-AV0 y ] Lit ] RR O L-71 r. y, ❑ I `R' n �uotwaa+.inc Figure D-4: Sheet Map 3 • r Sheet #4 !. . ' ; '16441% — " `i . - r y• Le end U ,� X141 tj /)Maiyierelv / / _ - r_~� — (See index map for complete list of legend items) in f '• • • - - - 1111111111111 VIII, ... ,- aue _ f , -al- _ ' .ts. _ r Study Area ` - " 1 ` • t New Substation i. \ �r Fab' � ti O ,. — j t Route 1 ... _. .� war c � >` •cM-• -� f t • f Alternative a �- rl• �/ - I Eliminated From Further Consideration !: ' ',� Existing Electric Transmission • : _ yI c'• and Generation • - -�r �- "' ' � _ _ •� - N het :._ � (Digitized from NAIP 2013 Aerial) Illp • - Substation I Irk ; . .�;:, ' • re -� ' �- Generation Facility • It '' '0 • - .4_ 4. kV Transmission Lin r. % -..;#• '*1 �_. �,% 3 5e f. ti y t a • — y • + '� 4 S . — 115kV Transmission Line %. flipi•' t � SP# t ' F `, lis — 230kV Transmission Line ' ' r0 •*. �. cif °Mit ' Tr; t ' •IN 230kV Double-Circuit Transmission Line ■ V , ipitLy li 1 ..IL` •�■ � �1f ; • q� ,� NI 1 `Ina + ` � 230kV/115kV Double-Circuit Transmission Line ' - ■r fit'Z L $ I!' !, i P • ,� - _ :lir, , � s��.�.�--�: CRf22 — • a ■ I z I • + lea -- = — t 1 S •;; Or ■ 1 !. �� • ,,� iti ,� i ,• t Existing Natural Gas Infrastructure - ■ - - _ _ = - • , , . _ ;� T+ /�, I1 --- t_ . . t..4 -� 1 { . `• (Ventyx 2013) I. ' �: ,1' Receipt Delivery Point or Processing Plant 4 . _ .. . _ _4,-- - I __a .3 . ✓ s 1... . Sr • % . , i II I 11 -20 Diameter - 4110 . W ,,, . I i , . law. - , i - • *'_ _ r - ` - I,ENk.., .. , ellappill' - - - -I 0 0 I i1•ltl 1 ' C It a r - i, ILI •� . it 1 i 4�_ >{-• . I r-G. al lAti �_ . 0 0.175 0.35 0 a pr '� x ` . .i. a1 '� �' 4 y r .. I I I „ o i ` Miles _ • in � : ; 1 1■ - , - t ,� . i Revised:5/28/2014 �, 4 .* Path: P:14929_SW Weld Expansan1GlSlLayouts1RoutingStudy1Sheetmaps1Sheetmaps.mxd All i- ,� ill s W It � r _ If 5.. Ati :: t+ll yi \:iii ar 10-i ■, -- -_� 1� •, _ 10 ..b., . - q . ., ... ► 10• _ iii,.� _ rl y 3i n i ii ?1 , • i _ „ . t. �� f.--.•--.= i ..� �'y-� • r f _ 1 TRI -STATE -a,y--_ , '�i P+'F` • ~ I ,'' ' , , - - -'. a■.:ann.. .10. 1436 I - -. •Is. • 4, • J p - - 1 ■ - • - ■ ■_.. • A •�■. ■�� .fir. �6 ... i- - A(M1OC4bM.IK Figure D-5: Sheet Map 4 LS@ - . y'I ; �: 0 Sheet #5 I- . I I� a _ _ \ UN " • i ,7" %1/4'' IILegend U M t celn;xmaPforcomPletellstofle9endltems) ' , t 1 , alga r I • ~. , i Study Area cr h'I ?it/ t ,� , r j New Substation Si o t 4 4\164 � 13,iir • - I Route 1 O w r. fit' p. '.4 ! - ' ` ■ . ;�, Alternative a i I l - -_ ' f..` liimot. _ _ __-f,. v Eliminated From Further Consideration ' Existing Electric Transmission • , .4: i � a. �` - 1 and Generation • � ' 1 (Digitized from NAIP 2013 Aerial) � • _ 1 . , d Substation '�„ I 1 Generation Facility r , 1• ; 4 • 34 5kV Transmission Line 0 H ENDENt1 J - milt . 7 ‘ 115kV Transmission Line -T -kit tri4Mk; 1 • r1 - 230kV Transmission Line.1 I ■�.' re -�` " w �_ —`� �wQ�r• i -.,. �l = at►. s 230kV Double-Circuit Transmission Line in At t w : 1� •11 + -.. ' �► ' ' �f`. � ( 7 :241 - ��; � 230kV/115kV Double Circuit Transmission Line • J 'SjIZea 1 11 .• I `1 { ,fif L l , 1'r ;` -I•�v -� 11 4. I" •:ti " f i G`1�, -�' �� ► '` �• -- i , ; Existing Natural Gas Infrastructure •• il S ‘4. -�' ■ , �` it 1 '' ! - (Ventyx 2013) a ' , _*• ., __' , • _ ; "� 4 ; ' ';. ~` • ,, Receipt Delivery Point or Processing Plant ,¢.. ,, ii -" `,0 • —�f' 11 -20" Diameter 4 J..• \\ •s I Mr 31 . ii I P . • 1 i I . - .r • 1-fir z� ' `/�' � 1 t. - `.1 �' -JAN • •I 4 . I W 4., • . e0-.. r , II_ . 1. i -'4 ,, 1 . . ' , , Wt. . i a • 1 • ‘. 1 3 f ' • . • f it avn, ... 4, AIL.../ ,, 0. 1 '1 .• ....4,74440 • . .. -I * ow- • 0 * � �_ I _. t -ilk _ • $. -a LL • -.- I .... _Apt e A +I r ' ! - • j�t�•: 410*. i:it_ . • ...) I • .. w \NI* - , . 111 ! ' ' ems fil i F e'''''' At -,- . I App • it I . , t ....— .. - .10 _ . . • lb •I — - i \i ,fri i ty 0 _ ` ,,a _ _ wn -� 'F Fo ' .'i - �' 0 0.175 0.35 f — u 1 l�I, �a I I I Y 4 . it- iiiM1M1M1 t •, �/ MilesCo s - Revised:5/2!1/2014 fki'l• is a �Idlia y1/4 1' • f' Path: P:14929 SW Weld_ExpansionlGISlLayouts\RoutingStudy\Sheetmaps\Sheebnaps.mxd.. ll. V. ''. lb lir-- \ • ‘ / irk;. ILI L4K c i • _ _ Cl2,22 . . , - � .' 1 •♦ io • __.r - - -- ' t, Jr OR 22 1• rallir—ri - • --• 0 , _ . a` • �_ 5 '4 l !• -, ,_1 mot. - : _ #: n \ il4 ` / r —�+ , `. . N` - - _ P , 1, 4.. �,� �� I - ;l • ` z-- � ail �t 1 �� ti I 1 if tat -alien .7 • l Y � ' ® • _=• =- ... s'talt 4-00 't _ ¢' r <rs - ' `' ,'r" ► I I y TRI -STATE I -STAT E LEI k _ Cal; r, +' r_ 1� _ti I Iti IMP WI in • '• 1 �►r:i�♦` ift A'�ki "%law- :I i s . • -- T.•.F...,•MFr�I�'( ,.•orn< A Figure D-6 : Sheet Map 5 .it � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Il . � � .. i� Sheet # 6 .-itiok___ + D ■, _ 1 . -red• .� "1116 � — k - _ '" 8" _ • t z — Legend U (See index map for complete list of legend items) tam -*w lh - L �, -r _ Study Area +I �1tif • �' •iliiir New Substation _� • ► :,• ° I .� ill A •_ Route 1 O `� . %••• , Alternative s 4 ' I _ __ - - Eliminated From Further Consideration !.Y ie • t. ! IIPP I 4 i • Orjall.411 i • Existing Electric Transmission and Generation � �^� r , 40 • / (Digitized from NAIP 2013 Aerial) '1/4, _ .tiIli vi 1 7. a • i f N �� • l"4 . ! , , I I it a , Substation r air , - - .; • f . M Generation Facility +r „ , 34.5kV Transmission Line liba-- ' w ,�� ,M F j ill°,, .. I' 1, * f iV .L 1' , l�I r I --------‘ 115kV Transmission Line i , 1 , ' ' irs t. •` t i 230kV Transmission Line i : '-, \we tN 230kV Double Circuit Transmission Line . 44 it_,--1, .,,.�„ '71� !'_ � • .�! ■ •.,1/4. L,' _� � 230kV/115kV Double-Circuit Transmission Line - -- — - —- _ Al `e, 1,4 1 VI - �;� • ' !:' Existing Natural Gas Infrastructure . I r ,. r, ' el + (Ventyx 2013) a 71A i - 1 i ,, _i iI Receipt Delivery Point or Processing Plant 4 i � .7_,, �1 . 1 11 -20" Diameter gli(------ „- 4 ., • _ , , . _ . _._ _ _. . , Ilia .. _ ,.. . . ,Tido, 1 lii, x .... • • am\ :,.. : iiii i . . \ w isi , • ... ....a. ik v• a , I .. \AC* nsfq r ,k —� - - - at 91- - .. . _ . ... _ \\ I \ siiii% ll 1 + ,• "Bii / 1 yIf _ • W -- — c D9a= - — _ _. — 0 '�,. �-�-- .�.� 9 �� ter-- — :� lit Si rIlkI 0 0.175 0.35 0 l N • 10 \. I I I I I `�`� / ,:' Miles 1 . j / Revised:5/28/2014 i � ' • 1 I �. ., Path: P:14929_SW Weld Expansion\GlStayautslRoutingStudy\Sheetmaps\Sheetrnaps.mxd Ihtii r �+ W 1j v� . ilIv .1 - i el • i �To G . �` �- B14 i • 1 7 R�.? - Wil‘iii\ I 1 6 = • ....,_ _ .. , r n . I aka MTh* ilk ,. 41 , 1 . s ry rr • Ua i,„ �,, �� 1------‘44 5_ ,I- I i , \ 4 , p0,..., H I , : , ak,„ s. ... ., . ... . ... ._ . f4 ,tm,41. T • j ... 4 . . _ N.,.... ve . IS�' �. T R I -STAT E Y! • )_ la K..,tie Emery"'4. a.rorn< OA Figure D-7: Sheet Map 6 4airr ' 1 �:- ,a - w • ' Tom / , ! 11 , ♦ 1,' ' _ ! ' . `.'. 11 . %.*- v i MARION AV i , , ' ' - : , Sheet #7 H �', es P � � • , .,. �. , r + ' N �� c,' • - t. <FNS CI GOODRICH CT :caw ( '" ; 4 rWill I�yr • ( it IL,....) ' r • , '. , 3 S ' a• x GOODRICH AV Is � , aNti yr . t ; � �;, . Allifi �;-, ' r Y� Legend . O X+� y� ' .4 . , �� CHERRY AV Q, lir- _ _ _ _ -� r 1 !i (See index map for complete list of legend items) ' . t IIrr al' . r i `• ' r +•- y�a' !� . , �"'O ` ' 0 PIERCE AV 'mil W j' 1 . 'tl ; , ti_ I L .. Study Area Fn- ,�Nc: en �;y� r. i ≥ j w) 1- ff yy �'r - - New Substation Lt- �. 4t .� -:a n t LSouth.V I y La 40 ' Route 1 O ` x Middle SChOOIC7 ' l r I. , •Or f l lbive7 BYERS AVI ill., ' ' Alternative ,� r �; . !�' a / k l'= ='i Eliminated From Further Consideration !y striI SALISBURY AV 41 �✓ ' I' I F l o Platteville 1 l♦, N _ �" a4. eia �5� �� , ' School I .� Platteville _ _ � I t 7 hl <pe e , _ as I' �` Existing Electric Transmission a. � � ism=if r and Generation • °� . 1 (Digitized from NAIP 2013 Aerial) I. Aisl t BELLA 7 ./ 3, r � ' 1 • ' t o•�, , ° , ,> D :J.- ( `':a • ' x ':< • Substation ' ' , ,i 4 tic.; N, : , _ W L'D ]� • ■ 4t. !� aft. _ - tont. , . a__A a It f J Generation Facility .Y�pi-► Ill ;,,j._ , CR 30,.r- Imo'{ "^_°'- 34.5kV Transmission Line �. �j I `•'� - - i ', rl -•• r .41 amt J ; � �'� , � I rk I Y ! .SIT f O �a. c� �iy w` (' , , f •�. ' , tt ae j l ., Y- � - `. —•-- 115kV Transmission Line wits n- 7 •s r .• •! lis �► • Is , ' , ti �,It i' • w _ , . �� 230kV Transmission Line • 230kV Double-Circuit Transmission Line tl� i ' ,,.; ' ;• °�`_ ? � ( ` s. �, 1 . , •• , • `' 'r +. ' ' ` f_ hf*f'# -Li ....,.. 4` se • 230kV/115kV Double Circuit Transmission Line 7---b--I0 IN.;�,. jai r '� "' `�� r �;'. ;. R��' 1 WI - •tip Existing Natural Gas Infrastructure -1'. It t tI+1 y. 1'1�. ' ' : � �� 4•� l 1�Z • "�` �' I 1 - (VentyX 2013) ti . ' _ ♦ �' �,� r .�. .N •�1' , f i`! 'r ; rte! - I• a '., ' , i ' 1 ' ^� % {cif' ' -J Receipt Delivery Point or Processing is �..-'' .Sa%le 4 ; � ` . • ' 1t. t�;� t . 4 --,e- e Plant it tc, 'f+" 3,`t�`' Iry ;. :'' .: • 11-20" Diameter • 4. • x - r> • 13 Fs_oft • 1I. N 74 irr. IN 'Vatq Vez 1, �;I * ' I .17 • •,,, ' Tit • 2 i, . (7, • I _.._.. .....minill r 5 - t6' . -.. .- \. -- I. r I f • ,� • 'L'= ; f A\t:-. 1 4 :Ikk- :a. . " .b. \k.' . _ '.,1 _ 4 .. jam_ Q 1 i A9 Pr• - �: 62 -_— __ . 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O4ice. j ..I - �, • ry 0 o4 TR I-STATE sal •. , y , V t, { i , Genre'torn ant ".arrur.woe t'r ! •j < F rn' Ilit Figure D-8: Sheet Map 7 MI at ,I ,,,AAlt - r Mead . •r h ...-= ; y WiNk 71'1'14 "40:i� `. •. R • '�. 1 . t ,7 .,., S ins. _ i III��` 'llrpf - ' tre• le r lam. . .. ..,. J [ • t • e♦ 1 Pe % •.# r to ; jr . - i ',V,'l , tillid Legend ~`rte, — : ,r ' =I'` -.~ • ' . Is - • •.� �i t ip ; ;yr.,_ ` •- ;`, ;'t . _ . j ' ' ir‘ 1 (See index map for complete list of legend items) fl •wl•_ .rte_ E :DiFISIMMi.:— . • !' . =1ri ir A. , I 1► WI - , .n. __ L. 1 LI Study Area ,. '� 1 `,a ...........7......i . \� , • - 1.' '` .—.•• ,, a '641�' N • ,fit _ '— New Substation • �: k4. .�. . _ • -' • ' 1 r! �±t� f �"' '.' r • Route 1 • ♦ r_.y� 4 ' 1 ,r- -a.•, 1 •. ,a I yam•• I 'I -,, Lt. _� 7 ' : -_. a ,N I . . f r I . ._ ,. , Alternative I. • '1 =T,{, . .:9-01... 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(8B I o . „0„ ii: _ r' • r s , 7 t I in �• �•r« ar. it, -6- v ,►moi ' !II it: 12 Hudson/11 A 4 _ , i, ift m's . i. , - .iir difr . _ i. ___, - V . • , . „se _,1 or 1 ri I e It , or • AdLie . - i k... 1 1 (r TRI -STATE � _ _.' i-—• _.SS _MI _ _ _ (M1 A O C 4M b .Inc EL► C0UN ROAD s .. mar ,u — _ i ' : .� t.k m . A F.� '� , � -..,< R Figure D-10 : Sheet Map 9 I y - 4 _ - '- III( «I • _ ' ' _ r Sheet #10 I— •f"---ell-- .............‘.......sy 111jotili, sr Er e� t• — r �, , 11t.4 , •• - ■y ). ,/' "`'- -,: ` Legend L. — — - - j YII. • t a f . ... • Y1 - , , • ; /}' •a.*p.Aa�a�►.u.{1 1 ! , E •�, • ill '� I • . . ... ... t -. (See index map for complete list of legend items) ' , t _ 1 1 1 i .•► • 1 t - y • yr M Stud Area riiiiit.- R • 1` 1 - - New Substation® • � r r_a. .pi. .. .. . . 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' er � •� 4 •L - AL•OK4t0.1.1 IRPARK Figure 0-11 : Sheet Map 10 Laf A. : ? / _ Sheet #�� I- 4 t -IP Legend r / t i Ike7: ,+ • _ IS gi ii f _� N. ntillti t ,� ;�' . ' Y (See index map for complete list of legend items) ' , t fli 4141004. 41,. . 1 i i ... . Study Area 4, , , .2.- /::: . . a_ xi. New Substation., . a�.., I . .. . . Ifl: , a _ :° 1 .�, \, l ) Route 1 O . it • . - . \ , , I \ ' .,,\ • LI•• - I Alternative �' Eliminated From Further Consideration !Y • �' _ Existing Electric Transmission / a. r Q 7 and Generation titl ' ` _ ' s Alt (Digitized from NAIP 2013 Aerial) ' IA111 . Substation ..at-1• ` - 1: \ ,',`v -fir III ii$ dt• • ♦ • 7. � • : 1ft 1eR G L J Generation Facility • —.C. 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Expansan5GlSlLayouls1RoutingStudy1Sheetmaps1Sheetmaps.mxd - - W It i 12 , 1., • I _ tki i ....i...A .• 414:1-4 ♦ •� 11 . 2 . - 1 ' i , _, it 1) I lit r leril I a 9 li —{ / Hudson [111.N - • - TRI -STATE ill • ' As, 4to1 IN 'n ,, i1 ' - • �/ - '. - =�+w_ r el1le- 1 r - - • .- -_ _ - Frmry�'1 ,.horn< 1. S[�' is/ Figure D-12 : Sheet Map 11 tRescr,ir W' `` , Sheet #sz 1�ti, _Dlk . .. . I . . si _takil.,y: ...ssit• a __lb ....c Legend U iv ' r �► �- 4 ` , , .01 ) '` (See index map for complete list of legend items) ID 4 if• .AlleN/ al 4.. . .: - , . p ••, - i - _ �i i i � , -__- . #0 ! Study Area lit . ••• •_if •• �� _ AID .. i , New Substation Illii-I --I ilk; r : %iiti C. sir . ,�- I ' " ,� ,. ;VII 4 �!.. 1 ( • Route 1 w�. �t I .: F1r4IL 1 � N''w�� • �-- _ +�,_ ' ,�.i'1 _ I a Rattl `ake I!a� . '�•:1: : : illsi Alternative el 4•1 -'4' . I ,,.ry Ridge 1 ' • , . 1:: • ,, ' I I Eliminated From Further Consideration � Substation, � i �• f • 1 III '• I 3 s - 41t • • `--- " 1 . 11 ._. _ ? Existing Electric Transmission Y• 1 . I t and Generation 1 - ' _ I • i -• -• .;4 /";� %,C `t ' �' 'L ) (Digitized from NAIP 2013 Aerial) • Substation Si i 4, . ', ) r" • ..... , . - : : :•. : ; '. It .0 I : i 4 �� jt •' ,r et ;} illi E .� J Generation Facility. ■• Li 1 tie iiii �x_1MI MIMI j - ► ®, ■ :� ( +,..... )... „......... ......_; �t act ► 34.5kV Transmission Line If . • ri_ 01101 I.+ i. is._ "` CR"30 ! _ — .�- --` •r em* II YH 115kV Transmission Line a• _.� . =• C;3tl� , s. ail 230kV Transmission Line �' r. ' 1- "' ° t" III —• 230kV Double Circuit Transmission Line Illt - . ' 40 _ — - — : . i �� : : �j e ail . -allir—Td ) 230kV/115kV Double Circuit Transmission Line°el. . 1� .- . . J 41 i r .. , ' ?' ?� 't , Existing Natural Gas Infrastructure 0 .. .� .r. 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Route 1 I - O I �\ I • t f Alternative ahr; YI ' ~( Eliminated From Further Consideration !Y $ _ 1 - Existing Electric Transmission I , . _ ----- r and Generation w (Digitized from NAIP 2013 Aerial) e�X ■� 4 ii + l Substation +` •� y I Z.r: lire • ji G Generation Facility 11 i / '� . - ,R, 34.5kV Transmission Line al. _, i ...L .. t 115kV Transmission Line I , - I{ - -_ - + 230kV Transmission Line 1444 in , I lb -40, j- * N 230kV Double Circuit Transmission Line ir lam' %' — 11, all ., • , . A, : . • , _lit ir. fr .1* • r � • 230kV/115kV Double Circuit Transmission Line 1al I lel Existing Natural Gas Infrastructure 1 ( (Ventyx 2013)011 1 !� Receipt Delivery Point or Processing Plant 1 '} .rt L ' ' . . 11 -20" Diameter 1 • , 41!y Isar G. _ ._ 3450 — . @ ` 'J ••. rt. L ' _; 'I: - '� 1#�`•i)t<1► ., I�ti�L r /3 X ogii • liP - 41 ,.. . 1 ill _ 1 q._ i41)t -. • , 444 _. ,,,k.:• . 'I s . CI mit .- ..\iv_ a. ., II - d, 1 ,%it —ii , , ' ►. W - 1 .. 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' =.-y • � '•. • TRI -STATE• L • Figure D-15: Sheet Map 14 —jili arl-isrr- 0 ■:'i ,� ��r`irr � • _�! •{� ,5 .� ' ' . t{, s■mi � r1 Jr , it Sheet #15 . 11/44-1110 0,.. -. * • , . . . , ...... _ Ili . I It0 0 . . ;� IP, 4 �,_ �' • 7. ` • Legend 1 . ■ . ;� "' �tr -' �',� : �•_:® F`- N.44 t • , (See index map for complete list of legend items) :(t - .0. ...4 1.... - . . • • _. • .1• • I • ' . h `�® -,' i ' Study Area vv. ` t ° 1 •• ' ` • `Y r■ i C 4 • "�S" - — — �. •�3� ill• .■' II .• ' :fit . r / A EEi :tatio -, I _ . _ , at A fla - t Es. ; i i i44 I. # Alit'sa. ' ' .x _- - -.1 * [K.- ■S • •• rl Eliminated From Further Consideration LL si 1 , • ` . ' ' ' ..■. I - ' \ r . .. t'` .44' ' ,: wit�.'i ' �: l �= " .';~` ' "y ( Existing Electric Transmission i - ♦ t - ► 2 ' fs's • ■ • ta. .:... 1 1r and Generation ` ' \ 4-* \` • 4. 4. r --. Pr • r. `S` e (Digitized from NAIP 2013 Aerial �` { zr, y t • ' Substation GIN41. . . . . ■*.. •• a r. .7 J S■ '♦ •.ID`11 S • - _ -- '• _• ■ _ •��, ,. 'w. y.�'■ ' / — 1 ' T+ ` _ r`' k H 1'6—cR as �;— CR 46 Z .. 1 , . ; r , �. i ;■�• r air • I_ :' jilt, i` ,y 1 ( .. n J Generation Facility it-• ■iI, ei, - se. s . .. . , • 1 r _ f .�.r .— { ° 34.5kV Transmission Line: et. i at•_r • I _ • -, 4M4Of it ,• ;0 ) O it. 115kV Transmission Line a , 1 111 • h _ — I • • ' ,r t " 14 I•f f A• 1 �� - _ _ . { 1 Ilk +�"� •' `, • ^�� ' ... ' • " � �'`� _ ` • 230kV Transmission Line • • •' WA ~�` + „M ra t r" ' �— 230kV Double Circuit Transmission Line �' G , . 'sMir .,.� . . . -,. . 1 '. .• ��1 ,• ` ✓..4. '� fir. �� - ' VI)r * . till+ 4.; } ' �— 230kV/115kV Double-Circuit Transmission Line • . vLet7II-1 - . • t Z 1 r..♦ V i �r Y — - •. • r ' - _ 'fie+• III.. `. . , Existing Natural Gas Infrastructure :� w d., r T - +f>R • ■al re 1 t, - (Ventyx 2013) _ .. LO —�•-a• 77 IP t' i .. •... :. X •• }`' • v' +_ • ,�' ®" " �. _« Receipt Delivery Point or Processing Plant. .si/ _-- __ ■ t °■ e = 11-20" Diameter Ill, WI r • P. ),„\ ' .r 4. ., n,•�� *rte , 4. _ .t - Illi : 4., 1. . _ ci, f 1. . , . ID iti 4. or. .,. _ _ . . ., , , .. .•• _... or , i • .4,4% . -.91,144t; ti.'LL: - • .i , O trr• t....41 .7. � i,. rJ • � H1'l) _..4,__ __ ,...t. _ .�i _ _-� r ? — SCR 44 M. St 1 . CR44 ■- Piet% 4111 b " • 49046.140..._< 1 • _. ... Mil .....•. • ..�.. • atilt '+ '� • r •1 , 1. / • a rte_..._..„.. . )♦/fir ; • A 1• ILI Lpy,itt.:. ...,-ire& 'tit,.. ore. , . - - 14 : •: ; is • s , . • • • , _. "OIL A . . ... 4 .. i • ., 41 Sii -- . it,: 1 1 I -...'• ; -- • - - .. . rSI ' -H9' - tit ik 4 . - . . . . . • 4 t - • 4.. , . .._ , .241•.:_j. • 1 EPA I t_ .. . 7: ..•1 !I .0•- "Ij- .."‘-- . , .••• • jt•. 0' ° k• 4 I • . • p r 0 0.175 0.35 0 ._ _• ' w�. # rs. i• ' . 'i 1 r`,r mil •!k! I ._ 1 �'�'. y + . 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Ill ....,.:1, :: • 1 • t, kil:0% 419 > • r a . .Ay ,", TRI —STATE •lb _ i i -4 • it it . , • . .• . . in •. •- - l• _..- ill!.1. . I :. 'dr I , . . . . . . . illi • .), _. .. .. : . . . . , . . . *II i- • Figure D-16: Sheet Map 15 ,�; J . '� - 7 ' -� ,. i? � Sheet #16 • ice/" 4 �. I, �: - 1 i- � I . � • JO , ` : (• ii ,t1 i !' �, r --- 1 Legend U '�. r • s .1 • IirVf-- 1: • 0 ,: • • ' t • I : ' �1i'." �� (See index map for complete list of legend items) r • _ t 1 , Study Area • r ___ - �- _ 6 -- ^.• f ^ New Substation i 0 , r' (`I -.- 1• . I Route 1 it • A a . F '- I • O / �" � '�► Alternative �' I. 44) . �/ r� N. ye., �. O • t { sy i9'te - _ _ Eliminated From Further Consideration !: f iL�' -�•�'� � -t S�--- - - _ _ _ - -_:._-�►,• _ _Rd, - ■�a - - -- - - Transmission — '_ am �, I :r �. •f ':. , "r, .,. Existing Electric % 1 i 1 i '`'� ■, �..•,c• Y, ., --- and Generation X • _ r ',L : ■• . ,•9. •y' p (Digitized from NAIP 2013 Aerial)Pr R •► _ , ■ ilt — �,- -- . , ` Substation L • jyralit n -� at �> • �; " � — tit -c , ' • P! ' �•� ■ G Generation Facility 0 4... _ y■ ■ d �. 34.5kV Transmission Line ' "� 71. • . ■_ ir . ...., 2.. . = st 115kV Transmission Line . 4 . _ ' GM i.„, ft ' ' ' F /'" • disi D. -_ _ _ `! _: ;;. •• —•— 230kV Transmission Line. I .�{'�`•�'r'" ■ ■ �■ ■! ■ ' r 1 • _- 1: _. if r t� 230kV Double Circuit Transmission Line �1, , ■ ' ra , 230kV/115kV Double-Circuit Transmission Line +aIllr . . 1 v Existing Natural Gas Infrastructure dG. • i - — - . J -a r (Ventyx 2013)viilliilliiii 4 + � 7; it • ali . II•. Il ! Receipt Delivery Point or Processing Plant x • • ` `� 1 11 -20" Diameter i ii • • — 1 • . 4 ' , ).. .• • i _ _ glib _A 0 x .. t p . ." cc It -- - 0.. gill .. a . . i tL...4. ihrint.7";* 'IMS, �� t Iii all I 4011441111t• ‘ 4i Li , - -ft 4! til - •�4 ass-r_ __ I ' i •wrr ii ;- a- , .-.....in I i *lap =• 40 , t \ (W ill i v • . at psi . y I - 0 • *it w 4.-77 : .. vs ., . • 4 4ii Ie.: # it PI 41 e"" 0 . a ill el •!1,1°1/4.,_i : 1 r 1 �` Y 1 •tr• /.IP-� ■: - -1 ;� _� • �� s i-� ' 9 ■see■. �� . . � � ,Y = • ! 'L/ �•� .r • �• • r. 3:■ � �• i 1J 1 , • 1.lip• • ,. . , , , ic _ .. for • ils , tr- J1 ' •'7 4 V7\1 \ r ... I 4. 6" Ed • at ;it . - 40 . _ g; R ' •. „„ v' , : a �" � 0 0.175 0.35 0 I Jr,. s • Miles Co t .r + ea , pules __., _ • Revised:5/28/2014 r4;1_ ` III:j: •.. • :ra:• •t Path: P:14929 SW Weld Expansion1GlSlLayoutslRoutingStudylSheetmaps1Sheetmaps.mxd i `t '�.. I'i 4 4 In iWait. . ; Kersey . . \ . I 4 - . 4., V N.s_i i'. i . I .7 ? - cm- a- 411„,./. , • .4, ill \ IN . Ilik• ' . . l' I 41 4b: ; ;Iiii _ 16 40 i in I lei% _ 1 + 'ale*� r. Ist - • '� • \ _,y' ... r iy• 04 i . rl t• - _ 60 ■ ` a I S;'a'," • ■.., - f I . �'. , . ^ I I .cam • . . . - / • ._ ti ,E AirI „rensr ■ 1 ep � ilfr s � ' -� 14 11 , kaill ' I r- 1 — J TRI —STATE .v a tear A44.004011 IN 'AL., � • !1 Y — . __ _ _o••Eli •- • '' ■ '��r'�` �N 3+• . ar• . fit.- - CR 4.6�'!L" - - H 1, 1 ,9� .. _ . _ �...%.'"------•-.26. .114461 � _ .'�;y j , - - _ - H`�`� 1�' ra e Figure D-17: Sheet Map 16 Southwest Weld Expansion Project Transmission Routing Study Appendix E : Comparative Matrix Southwest Weld Expansion Project Transmission Routing Study This page intentionally left blank. Greenhouse Substation to Henry Lake Substation Route A Route B Route C Route D Route E Route F Route G Selected Routes Alternative Route 2 Alternative Route 3 Route 1 Segments C9, C6, C11, C3, C2 C9, C6, C11, Cl C9, C7, CS, C3, C2 C9, C7, CS, Cl C8, CS, C3, C2 C8, CS, Cl C9, C6, C4, C10, 2 Overall length (miles) 6.18 6.2.5 6.14 6.2.1 7.05 7.15 6. 8 Rank (Low Best) 2 5 1 4 6 7 3 Number of road crossings 5.00 5.00 5.00 5.00 5.00 5.00 5,n Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to U.S. Highways(within 150 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.08 Rank(High Best) 1 1 1 1 1 1 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 0.00 0.0' 0.09 Rank (Low Best) 1 1 1 1 1 1 1 Length adjacent to State Highways (within 75 ft) (miles) 0.03 0:03 0.03 0.03 0.03 0.03 0.0 Rank(High Best) 1 1 4 4 4 4 1 Number of State Highways crossings 1.00 1.00 1.00 1.00 1.00 1.0C 1.66 Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to roads(within 75 ft) (miles) 0.60 1.03 0.14 0.58 0.83 1.27 0.1 Rank (High Best) 4 2 6 5 3 1 7 Length adjacent to parcel lines (within 75 ft) (miles) 1.12 1.53 1.90 2.30 2.37 2.77 1.18 Rank(High Best) 6 5 4 3 2 1 7 Length adjacent to existing transmission line (within 75 ft) (miles) 0.06 0.06 0.47 0.47 0.38 0.38 0.0. Rank(High Best) 5 5 1 1 3 3 5 Number of existing transmission line crossings 2.00 2.00 3.00 3.00 2.00 2.00 2.00 Rank (Low Best) 1 1 6 6 1 1 1 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles) ' 3.41 3.16 0.71 0.47 1.17 0.93 3.58 Rank(High Best) 2 3 6 7 4 5 1 Number of natural gas or oil pipeline crossings 1 17.00 17.00 11.00 11.00 7.00 7.00 17.00 Rank(Low Best) 5 5 3 3 1 1 5 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.08 Rank (High Best) 1 1 1 1 1 1 1 Number of railroad crossings 0.00 0.00 0.0_0 0.00 0.00 0_._00 0.88 Rank(Low Best) 1 1 1 1 1 1 1 Total length adjacent to linear features (miles)2 3.37 3.43 1.07 1.13 1.72 1.78 3.73 Rank(High Best) 3 2 7 6 5 4 1 Percent length adjacent to linear features 54.46% 54.87% 17.48% 18.29% 24.42% 25.06% 60.28 Rank(High Best) 3 2 7 6 5 4 1 lin Total Score 35 35 44 45 35 33 37 1 F Overall Rank 2 2 6 7 2 1 5 ll I Wand Gas and Industrial Factors airaNallW Oil and gas wells within 75 ft 0.00 0.00 0.00 0.00 0.00 0.0 ' 0.66 Rank(Low Best) 1 1 1 1 1 1 1 Oil and gas wells within 200 ft 0.00 0.00 0.00 0.00 _ 2.00 2.00 0.8 Rank(Low Best) 1 1 1 1 6 6 1 Oil and gas other facilities within 75 ft 0.00 0.00 0.00 0.00 0.00 0.0C 0.08 Rank (Low Best) 1 1 1 1 1 1 1 Oil and gas other facilities within 200 ft 0.00 0.00 1.00 1.00 1.00 1.0C 0.66 Rank(Low Best) 1 1 4 4 4 4 1 Water wells within 75 ft 0.00 0.00 0.00 0.00 0.0C 0.00 0.II Rank(Low Best) 1 1 1 1 1 1 1 Mines within 75 ft 0.00 0.00 0.00 0.00 _ 0.00 0.00 0.' Rank(Low Best) 1 1 1 1 1 1 1 E Total Score 6 6 9 9 14 14 6 • S Overall Rank 1 1 4 4 6 6 1 nikilliallagirs Center pivots within 75 ft 0.00 0.00 1.00 1.00 1.0C 1.00 0.66 Rank(Low Best) 1 1 3 3 3 3 1 Leng_thon_state land board (miles) 0._0_0 0.00 0.00 0.00 O.Cp 0.00 0.8 8 Rank(High Best) 1 1 1 1 1 1 1 Length in municipal land (miles) 1.87 1.94 1.42 1.49 1.62 1.68 1. Rank (Low Best) 6 7 2 3 4 5 1 Length in subdivision (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.66 Rank(Low Best) 1 1 1 1 1 1 1 Distance to closest school (miles) 1.60 1.46 1.60 1.46 1.60 1.44 1...6 Rank(High Best) 1 4 1 4 1 4 1 Distance to closest airport(public) (miles) 3.19 3.07 3.07 3.07 3.07 3.62 3.0' Rank (High Best) 2 3 3 3 3 1 3 Distance to closest airport (private) (miles) 5.06 5.05 5.06 5.05 5.06 5.05 5.0 Rank (High Best) 1 4 1 4 1 4 1 Total Score 13 21 _ 12 19 14 19 9 Overall Rank 3 7 2 5 4 5 1 rResidences and other Structures Ai Residences within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.8 0.08 Rank(Low Best) 1 1 1 1 1 1 1 Residences within 75-200 ft of centerline 0.00 0.00 1.00 1.00 1.00 1.0C 0.08 Rank(Low Best) 1 1 4 4 4 4 1 Total residences within 200 ft of centerline 0.00 0.00 1.00 1.00 1.00 1.0C 0.01 Rank (Low Best) 1 1 4 4 4 4 1 Total residences within 500 ft of centerline 0.00 2.00 2.00 4.00 3.00 5.0C _ 0.06 Rank(Low Best) 1 3 3 6 5 7 1 Other structures within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.0C 0.8 Rank(Low Best) 1 1 1 1 1 1 1 Other structures within 75-200 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 Number of parcels within 75 ft of centerline 18.00 20.00 2_0.0.0_ 22.0.0 27.00 29.00 18.08 Rank(Low Best) 1 3 3 5 6 7 1 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.66 Rank(Low Best) 1 1 1 1 1 1 1 Number of communication facilities within 75-200 ft of centerline 2.00 2.00 2.00 _ 2.00 _ 4.00 4.00 2.n Rank(Low Best) 1 1 1 1 6 6 1 Total Score 9 13 19 24 29 32 9 Overall Rank 1 3 4 5 6 7 1 PR sou Length crossing wetlands (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.n Rank(Low Best) 1 1 1 1 1 1 1 Length crossing S. Platte River (miles) _ 0.00 0.00 0.00 0_.0_0 0.0_0_ 0_.C_K 0.08 Rank (Low Best) 1 1 1 1 1 1 1 Number of perennial waterway crossings (excluding S. Platte) 0.00 0.00 0.00 0.00 0.00 0.00 0.0' Rank (Low Best) 1 1 1 1 1 1 1 Number of intermittent waterway crossings 0.00 0.00 0.00 0.00 _ 0.00 0.00 0.8hl Rank(Low Best) 1 1 1 1 1 1 1 Number of ditch crossings 0.00 0.00 1.00 1.00 1.0C 1.00 0.n Rank(Low Best) 1 1 4 4 4 4 1 Length crossing probable playa (miles) 0.00 0.00 0.00 0.00 0.00 0.0C 0.08 Rank (Low Best) 1 1 1 1 1 1 1 length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.08 Rank (Low Best) 1 1 1 1 1 1 1 Length crossing important game species habitat(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.08 Rank(Low Best) 1 1 1 1 1 1 1 Length crossing important avian habitat(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.0v Rank(Low Best) 1 1 1 1 1 1 1 Total Score 9 A 9 12 12 12 12 9 1 Overall Rank 1 1 •' 4 4 4 4 1 1 Cultural Resour Numberof NRHP sites within 1/4 mile 0.00 0.00 0.00 _ 0.00 0.00 0.6i 0.08 Rank (Low Best) 1 1 1 1 1 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery. Greenhouse Subsation to Davis Tap Route A Route B Selected Routes Route 1 Alternative Route 2 Segments D1, D2, D5, D6, D7 D1, D2, D3, D4, D6, D7 Engineering Factors _ Overall length (miles) _ 3.65 4.55 Rank (Low Best) 1 2 Number of road crossings 1.00 _ 1.00 Rank (Low Best) 1 1 Length adjacent to U.S. Highways (within 150 ft) (miles) 0.00 0.00 Rank (High Best) 1 1 Number'of U.S. Highways crossings _ 0.00 _ 0.00 Rank (Low Best) 1 1 Length adjacent to State Highways (within 75 ft) (miles) 0.00 0.00 Rank (High Best) 1 1 Number of State Highways crossings 0.00 0.00 Rank (Low Best) 1 1 Length adjacent to roads (within 75 ft) (miles) 0.03 0.03 Rank (High Best) 1 1 Length adjacent to parcel lines (within 75 ft) (miles) 1.31 1.34 Rank (High Best) 2 1 Length adjacent to existing transmission line (within 75 ft) (miles) 1.00 1.00 Rank (High Best) 1 1 Number of existing transmission line crossings 3.00 3.00 Rank (Low Best) 1 1 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles) 1 0.60 0.59 Rank (High Best) 1 2 Number of natural gas or oil pipeline crossings 1 8.00 8.00 Rank (Low Best) 1 1 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 Rank (High Best) 1 1 Number of railroad crossings 0.00 0.00 Rank (Low Best) 1 1 Total length adjacent to linear features (miles) 2 2.33 2.33 Rank (High Best) 1 2 Percent length adjacent to linear features 63.94% 51.23% Rank (High Best) 1 2 Total Score 16 18 Overall Rank 1 2 Oil and Gas and Industrial Factors Oil and gas wells within 75 ft 0.00 0.00 Rank (Low Best) 1 1 Oil and gas wells within 200 ft 4_.00 4.00 Rank (Low Best) 1 1 Oil and gas other facilities within 75 ft 0.00 0.00 Rank (Low Best) 1 1 Oil and gas other facilities within 200 ft 0.00 0.00 Rank (Low Best) 1 1 Water wells within 75 ft 0.00 0.00 Rank (Low Best) 1 1 Mines within 75 ft 0.00 0.00 Rank (Low Best) 1 1 Total Score 5 5 Overall Rank 1 1 Jurisdiction/Land Use Factors a Center pivots within 75 ft _ 0.00 0.00 Rank (Low Best) 1 1 Length on state land board (miles) _ 0.00 0.00 Rank (High Best) 1 1 Length in municipal land (miles) 0.79 0.94 Rank (Low Best) 1 2 Length in subdivision (miles) 0.00 0.00 Rank (Low Best) 1 1 Distance to closest school (miles) 1.28 0.88 Rank (High Best) 1 2 Distance to closest airport (public) (miles) 2.21 1.82 Rank (High Best) 1 2 Distance to closest airport (private) (miles) 3.95 3.95 Rank (High Best) 1 2. Total Score 7 11 Overall Rank 1 2 Residences and Other Structures Residences within 75 ft of centerline _ 0.00 0.00 Rank (Low Best) 1 1 Residences within 75 - 200 ft of centerline 1.00 1.00 Rank (Low Best) 1 1 Total residences within 200 ft of centerline 1.00 1.00 Rank (Low Best) 1 1 Total residences within 500ft of centerline _ 3.00 3.00 Rank (Low Best) 1 1. Other structures within 75 ft of centerline 0.00 0.00 Rank(Low Best) 1 1 Other structures within 75 - 200 ft of centerline 0.00 0.00 Rank (Low Best) 1 1 Number of parcels within 75 ft of centerline 11.00 _ 12.00 Rank (Low Best) 1 2 Number of communication facilities within 75 ft of centerline 0.00 0.00 Rank (Low Best) 1 1 Number of communication facilities within 75 - 200 ft of centerline 0.00 0.00 Rank (Low Best) 1 1 Total Score 9 1 a 10 a Overall Rank 1 I ' 2 Natural Resources _IL_ Length crossing wetlands (miles) 0.00 0.00 Rank (Low Best) 1 1 Length crossing S. Platte River (miles) 0.00 0.00 Rank (Low Best) 1 1 Number of perennial waterway crossings (excluding S. Platte) 0.00 0.00 Rank (Low Best) 1 1 Number of intermittent waterway crossings 0.00 0.00 Rank (Low Best) 1 1 Number of ditch crossings 0.00 0.00 Rank (Low Best) 1 1 Length crossing probable playa (miles) 0.00 0.00 Rank (Low Best) 1 1 Length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 Rank (Low Best) 1 1 Length crossing important game species habitat (miles) 0.00 0.00 Rank(Low Best) 1 1 Length crossing important avian habitat (miles) 0.00 0.1.3 Rank (Low Best) 1 2 Total Score 9 10 Overall Rank 1 2 Cultural Resources Number of NRHP sites within 1/4 mile _ _ 0.00 0.00 Rank (Low Best) 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery. Davis Substation to Wheeler Tap Route A Route B Route C Route D Route E Route F Route G Route H Route I Route J Alternative Alternative Selected Routes Route 1 Route 2 Route 3 617, 815, 614, B17, 615, B14, B17, 615, 614, 817, 615, 814, 617, B16, 614, B17, B16, 614, 817, 615, 614, B17, 615, B14, B12, 611, B9, 613, 69, 68, 612, B11, 68, B13, B6, B5, 63, 612, 611, 620, B12, B10, B18, B13, B9, 619, Segments B13, B6, B5, B1 66, 85, B1 B18, B4, 62 B18, B4, 62 B2 619, B4, 62 87, BS, B1 B7, B5, 63, 82 64, 62 84, B2 Engineering Factors Overall length (miles) 8.99 10.04 9.15 9.32 9.19 9.39 9.49 9.69 9.33 9.06 Rank(Low Best) 1 10 3 5 4 7 8 9 6 2 Number of road crossings 6.00 9.00 13.00 14.00 10.00 10.00 6.00 10.00 16.00 9.00 Rank(Low Best) 1 3 8 9 5 5 1 5 10 3 Length adjacent to U.S.Highways (within 150 ft) (miles) 0.08 0.08 0.08 0.08 _ 0.08 0.08 0.47 0.47 0.08 0.08 Rank (High Best) 3 3 6 6 3 9 1 1 6 9 Number of U.S. Highways crossings 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Length adjacent to State Highways(within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 Rank(High Best) 1 1 1 1 1 1 1 1. 1 1 Number of State Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 1 1 Length adjacent to roads (within 75 ft) (miles) 3.24 0.94 5.37 3.03 4.38 2.06 0.51 1.65 5.48 4.41 Rank(High Best) 5 9 2 6 4 7 10 8 1 3 Length adjacent to parcel lines (within 75 ft) (miles) 4.66 5.49 5.94 6.20 5.44 5.66 5.19 5.98 5.76 5.25 Rank(High Best) 10 6 3 1 7 5 9 2 4 8 Length adjacent to existing transmission line (within 75 ft) (miles) 0.05 1.05 0.05 1.05 0.05 1.05 0.13 0.13 0.08 0.05 Rank (High Best) 7 1 7 1 7 1 4 4 6 7 Number of existing transmission line crossings 2.00 4.00 2.00 4.00 2.00 4.00 5.00 5.00 4.00 2.00 Rank(Low Best) 1 5 1 5 1 5 9 9 5 1 Length adjacent to existing natural gas or oil pipeline(within 75 ft) (miles)1 0.09 0.42 0.09 0.42 0.09 0.82 0.09 0.09 1.33 0.09 Rank (High Best) 5 3 5 3 5 2 9 9 1 5 Number of natural gas or oil pipeline crossings 1 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Length adjacent to railroad(within 75 ft) (miles) 0.07 0.07 0.03 0.03 0.07 0.03 1.84 1.84 0.03 0.03 Rank(High Best) 3 3 6 6 3 9 1 1 6 9 Number of railroad crossings 1.00 1.00 1.00 1.00 1.00 1.00 3.00 3.00 1.00 1.00 Rank (Low Best) 1 1 1 1 1 1 9 9 1 1 Total length adjacent to linear features (miles)2 5.91 4.95 6.67 5.71 6.44 6.87 4.66 5.19 8.81 6.72 Rank(High Best) 6 9 4 7 5 2 10 8 1 3 Percent length adjacent to linear features 65.74% 49.31% 72.94% 61.34% 70.12% 73.15% 49.12% 53.61% 94.50% 74.24% Rank(High Best) 6 9 4 7 5 3 10 8 1 2 Total Score 47 57 50 54 49 57 75 69 51 55 Overall Rank 1 7 3 5 2 7 10 9 4 6 =" and Gas and Industrial Factors - _- Oil and gas wells within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Oil and gas wells within 200 ft 3.00 3.00 0.00 0.00 3.00 2.00 6.00 6.00 0.00 2.00 Rank(Low Best) 6 6 1 1 6 - 4 9 9 1 4 Oil and gas other facilities within 75 ft 1.00 1.00 3.00 3.00 2.00 2.00 2.00 3.00 2.00 2.00 Rank (Low Best) 1 1 8 8 3 3 3 8 3 3 on and gas other facilities within 200 ft 6.00 5.00 _ 13.00 10.00 10.00 _ 8.00 3.00 _ 7.00 _ 15.00 10.00 Rank(Low Best) 3 2 9 6 6 5 1 4 10 6 Water wells within 75 ft 2.00 2.00 2.00 - 2.00 1.00 2.00 5.00 4.00 2.00 2.00 Rank(Low Best) 2 2 2 2 1 2 10 9 2 2 Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Total Score 13 12 21 18 17 15 24 31 17 16 Overall Rank 2 1 8 7 5 3 9 10 5 4 Jurisdiction/Land.Use Factors - - Center pivots within 75 ft 1.00 6.00 5.00 7.00 1.00 7.00 0.00 0.00 2.00 4.00 Rank(Low Best) 3: 8 7 9 3 9 1 1 5 6 Length on state land board(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 1 1 1 1 Length in municipal land (miles) 0.00 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 1 1 Length in subdivision(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Distance to closest school (miles) 2.33 2.16 1.35 1.35 1.81 1.35 2.33 1.81 135 1.35 Rank (High Best) 1 3 6 6 4 6 1 4 6 6 Distance to closest airport(public)(miles) 3.67 3.67 3.67 3.67 3.67 3.67 3.33 3.33 3.67 3.67 Rank (High Best) 1 1 1 1 1 1 9 9 1 1 Distance to closest airport(private) (miles) 0.46 0.62 0.46 0.98 0.46 0.93 1.13 1.13 1.48 0.46 Rank(High Best) 7 6 7 4 7 5 2 2 1 7 Total Score 15 21 24 23 18 24 16 19 16 23 Overall Rank 1 6 9 7 4 9 2 5 2 7 Residences and Other Structures Residences within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 1 1 Residences within 75 - 200 ft of centerline 5.00 _ 3.00 10.00 8.00 8.00 7.00 2.00 5.00 10.00 9.00 Rank(Low Best) 3 2 9 6 6 5 1 3 9 8 Total residences within 200 ft of centerline 5.00 3.00 10.00 8.00 8.00 7.00 2.00 5.00 10.00 9.00 Rank(Low Best) 3; 2 9 6 6 5 1 3 9 8 Total residences within 500 ft of centerline 7.00 6.00 18.00 15.00 16.00 12.00 6.00 15.00 19.00 15.00 Rank(Low Best) 3 1 9 5 8 4 1 5 10 5 Other structures within 75 ft of centerline 1.00 1.00 0.00 0.00 0.00 0.00 1.00 0.00 0.00 0.00 Rank (Low Best) 8 8 1 1 1 1 8 1 1 1 Other structures within 75-200 ft of centerline 0.00 0.00 2.00 2.00 3.00 2.00 0.00 3.00 3.00 2.00 Rank (Low Best) 1 1 4 4 8 4 1 8 8 4 Number of parcels within 75 ft of centerline 36.00 44.00 50.00 53.00 44.00 48.00 48.00 56.00 51.00 43.00 Rank (Low Best) 1 3 7 9 3 - 5 5 10 8 2 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Number of communication facilities within 75-200 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Total Score 22 20 42 34 35 27 20 33 48 31 Overall Rank 3 1 9 7 8 4 1 6 10 5 Length crossing wetlands(miles) 0.16 0.16 0.10 0.10 0.19 0.10 0.16 0.19 0.10 0.10 Rank(Low Best) 6 6 1 1 9 1 6 9 1 1 Length crossing S. Platte River(miles) 0.05 0.05 0.04 0.04 0.05 0.04 0.05 0.05 0.04 .0.04 Rank(Low Best) 5 5 1 1 5 1 5 5 1 1 Number of perennial waterway crossings(excluding S. Platte) 0.00 0.00 0.00 0.00 0.00 0.00 1.00 1.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 8 8 1 1 Number of intermittent waterway crossings 1.00 1.00 2.00 2.00 2.00 2.00_ 2.00 _ 3.00 2.00 _ 2.00 Rank(Low Best) 1 1 3 3 3 3 3 9 3 3 Number of ditch crossings 10.00 11.00 9.00 10.00 12.00 10.00 9.00 11.00 10.00 9.00 Rank(Low Best) 3 7 1 3 9 3 1 7 3 1 Length crossing probable playa a (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas (miles) 1.26 1.26 1.20 1.20 1.42 1.20 1.26 1.42 1.20 1.20 Rank(Low Best) 5 5 1 1 8 4 5 8 1 4 Length crossing important game species habitat(miles) 1.71 1.71 1.75 1.75 2.41 1.75 1.71 2.41 1.75 1.75 Rank(Low Best) 1 1 4 4 8 4 1 8 4 4 Length crossing important avian habitat(miles) 0.61 0.61 0.66 0.66 0.61 0.66 0.88 0.88 0.66 0.66 Rank(Low Best) 1 1 4 4 1 4 8 8 4 4 Total Score 24 28 17 19 45 22 38 63 19 20 Overall Rank 6 7 1 2 9 5 8 10 2 4 Cultural Resources Number of NRHP sites within 1/4 mile 0.00 _ 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 _ 0.00 0.00 Rank(Low Best) 1 1 1 1 1 1 1 1 1 1 1 Pipeline data are incomplete;these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features(roads, rail,transmission,distribution,ditches)was digitized based on 2014 aerial imagery. Wheeler Lake Substation to Firestone Tap Route A Route B I Route C Route D Route E I Route F Selected Routes Alternative Route 3 Route 1 Alternative Route 2 Segments All, A9, A8 All, A9, A10, A6, A5 All, A9, A10, A6, A4, Al All, A3, A7, A6 ,A5 All, A3, A7, A6 ,A4, Al All, A3, A2, Al Engineering Factors 4 Overall length (miles) _ _ 4.24 4.68 5.50 _ 4.07 _ 4.89 4.96 Rank (Low Best) 2 3 6 1 4 5 Number of road crossings 6.00 6.00 _ 5.00 4.00 _ 3.00 _ 4.00 Rank (Low Best) 5 5 4 2 1 2 Length adjacent to U.S. Highways (within 150 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 _ 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to State Highways (within 75 ft) (miles) 0.00 0.00 0.00 0.00 _ 0.00 0.00 Rank(High Best) 1 1 1 1 1 1 Number of State Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to roads (within 75 ft) (miles) _ 2.18 2.37 1.97 1.01 _ 0.61 0.12 Rank(High Best) 2 1 3 4 5 6 Length adjacent to parcel lines (within 75 ft) (miles) 3.54 4.13 4.95 3.85 4.67 4.58 Rank (High Best) 6 4 1 5 2 3 Length adjacent to existing transmission line (within 75 ft) (miles) 0.04 0.04 0.05 0.04 0.04 0.06 Rank (High Best) 4 5 2 6 3 1 Number of existing transmission line crossings 2.00 2.00 2.00 2.00 2.00 2.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles)` 0.16 0.16 0.16 0.03 0.03 0.03 Rank (High Best) 1 1 1 5 5 4 Number of natural gas or oil pipeline crossings - 1.00 1.00 1.00 1.00 1.00 1.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Number of railroad crossings 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total length adjacent to linear features (miles)z 2.47 2.82 3.04 1.80 2.02 3.22 Rank (High Best) 4 3 2 6 5 1 Percent length adjacent to linear features 2 58.20% 60.14% 55.21% 44.17% 41.29% 64.82% Rank(High Best) 3 2 4 5 6 1 Total Score 32 30 _ 27 37 33 30 Overall Rank 4 2 1 6 5 2 Oil and Gas and Industrial Factors Oil and gas wells within 75 ft 3.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 6 1 1 1 1 1 Oil and gas wells within 200 ft 7.00 3.00 4.00 1.00 2.00 2.00 Rank (Low Best) 6 4 5 1 2 2 Oil and gas other facilities within 75 ft 6.00 4.00 4.00 0.00 0.00 0.00 Rank (Low Best) 6 4 4 1 1 1 Oil and gas other facilities within 200 ft 16.00 15.00 15.00 4.00 4.00 5.00 Rank (Low Best) 6 4 4 1 1 3 Water wells within 75 ft 8.00 5.00 5.00 0.00 0.00 0.00 Rank (Low Best) 6 4 4 1 1 1 Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total Score 25 17 18 5 6 8 Overall Rank 6 4 5 1 2 3 Jurisdiction/Land Use Factors Center pivots within 75 ft 4.00 8.00 9.00 4.00 5.00 2.00 Rank (Low Best) 2 5 6 2 4 1 Length on state land board (mites) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Length in municipal land (miles) 0.00 0.55 0.26 0.55 0.26 0.76 Rank (Low Best) 1 4 2 4 2 6 Length in subdivision (miles) 0.00 0.13 0.01 0.13 0.01 0.53 Rank (Low Best) 1 4 2 4 2 6 Distance to closest school (miles) 1.48 1.48 0.97 1.48 0.97 0.97 Rank (High Best) 1 1 4 1 4 4 Distance to closest airport (public) (miles) 10.47 10.47 10.47 10.34 10.34 9.83 Rank (High Best) 1 1 1 4 4 6 Distance to closest airport (private) (miles) 3.79 3.79 3.79 3.79 3.79 3.79 Rank (High Best) 1 1 1 1 1 1 Total Score 8 17 17 17 18 25 Overall Rank 1 2 2 2 5 6 Residences and Other Structures Residences within 75 ft of centerline 1.00 1.00 1.00 0.00 0.00 0.00 Rank (Low Best) 4 4 4 1 1 1 Residences within 75 - 200 ft of centerline _ 6.00 8.00 6.00 3.00 _ 1.00 2.00 Rank (Low Best) 4 6 4 3 1 2 Total residences within 200 ft of centerline 7.00 9.00 7.00 3.00 1.00 2.00 Rank (Low Best) 4 6 4 3 1 2 Total residences within 500 ft of centerline 13.00 18.00 15.00 6.00 3.00 9.00 Rank (Low Best) 4 6 5 2 1 3 Other structures within 75 ft of centerline 0.00 0.00 2.00 0.00 2.00 2.00 Rank (Low Best) 1 1 4 1 4 4 Other structures within 75 - 200 ft of centerline 0.00 2.00 3.00 1.00 2.00 2.00 Rank (Low Best) 1 3 6 2 3 3 Number of parcels within 75 ft of centerline 33.00 44.00 47.00 33.00 36.00 44.00 Rank (Low Best) 1 4 6 1 3 4 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Number of communication facilities within 75- 200 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total Score 21 32 35 15 16 21 Overall Rank 3 5 6 1 2 3 ural Resources,-,_k Length crossing wetlands (miles) 0.00 0.07 0.10 0.07 0.10 0.09 Rank (Low Best) 1 2 5 2 5 4 Length crossing S. Platte River(miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Number of perennial waterway crossings (excluding S. Platte) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Number of intermittent waterway crossings 0.00 1.00 1.00 1.00 1.00 0.00 Rank (Low Best) 1 3 3 3 3 1 Number of ditch crossings 11.00 7.00 6.00 5.00 4.00 2.00 Rank (Low Best) 6 5 4 3 2 1 Length crossing probable playa (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length crossing important game species habitat (miles) 1.64 0.19 0.00 0.19 0.00 0.00 Rank (Low Best) 6 4 1 4 1 1 Length crossing important avian habitat (miles) 1.62 0.17 0.00 0.17 0.00 0.00 Rank (Low Best) 6 4 1 4 1 1 Total Score 24 22 18 20 16 12 Overall Rank 6 5 3 4 2 1. Cultural Resources a Number of NRHP sites within 1/4 mile _ 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail,transmission, distribution, ditches)was digitized based on 2014 aerial imagery Greenhouse Substation to Colfer Substation Route A Route B Route C Route D Route E Selected Routes Alternative Route 3 Route 1 Alternative Route 2 El, E2, E3, E4, E5, E6, E10, El, E2, E3, E4, ES, E6, E8, El, E2, E3, E4, ES, E7, E8, El, E2, E3, E4, E5, E7, E9, Segments El, E2, Ell, E13, E14 E13, E14 E9, E12, E14 E10, E13, E14 E12, E14 Engineering Factors Overall length (miles) 11.03 _ 9.52 10.55 10.08 10.49 Rank (Low Best) 5 1 4 2 3 Number of road crossings 3.00 4.00 6.00 4.00 8.00 Rank (Low Best) 1 2 4 2 5 Length adjacent to U.S. Highways (within 150 ft) (miles) _ 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Length adjacent to State Highways (within 75 ft) (miles) 3.47 0.00 0.00 0.00 0.00 Rank (High Best) 1 2 2 2 2 Number of State Highways crossings 2.00 0.00 0.00 0.00 0.00 Rank (Low Best) 5 1 1 1 1 Length adjacent to roads (within 75 ft) (miles) 0.09 0.13 0.58 0.21 2.30 Rank (High Best) 5 4 2 3 1 Length adjacent to parcel lines (within 75 ft) (miles) 5.18 4.24 4.66 4.31 6.19 Rank (High Best) 2 5 3 4 1 Length adjacent to existing transmission line (within 75 ft) (miles) 0.89 2.57 0.22 2.60 0.11 Rank (High Best) 3 2 4 1 5 Number of existing transmission line crossings 2.00 6.00 6.00 7.00 4.00 Rank (Low Best) 1 3 3 5 2 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles)' 2.57 0.67 0.67 0.67 0.67 Rank (High Best) 1 2 2 2 2 Number of natural gas or oil pipeline crossings' 12.00 10.00 10.00 10.00 10.00 Rank(Low Best) 5 1 1 1 1 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 Number of railroad crossings 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Total length adjacent to linear features (miles)2 7.81 7.69 8.47 8.25 8.24 Rank (High Best) 4 5 1 2 3 Percent length adjacent to linear features 70.84% 80.71% 80.31% 81.78% 78.58% Rank (High Best) 5 2 3 1 4 Total Score 37 32 31 29 30 Overall Rank 5 4 3 1 2 Oil and Gas and Industrial Factors Oil and gas wells within 75 ft _ 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Oil and gas wells within 200 ft 6.00 4.00 13.00 4.00 14.00 Rank (Low Best) 3 1 4 1 5 Oil and gas other facilities within 75 ft 0.00 0.00 1.00 0.00 1.00 Rank (Low Best) 1 1 4 1 4 Oil and gas other facilities within 200 ft 5.00 2.00 6.00 4.00 7.00 Rank (Low Best) 3 1 4 2 5 Water wells within 75 ft 3.00 0.00 1.00 0.00 1.00 Rank (Low Best) 5 1 3 1 3 Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Total Score 13 5 16 6 18 Overall Rank 3 1 4 2 5 Jurisdiction/Land Use Factors Center pivots within 75 ft _ 4.00 3.00 4.00 3.00 4.00 Rank (Low Best) 3 1 3 1 3 Length on state land board (miles) 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 Length in municipal land (miles) 0.78 0.79 0.79 0.79 0.79 Rank (Low Best) 1 2 2 2 2 Length in subdivision (miles) _ 0.12 0.00 0.00 0.00 0.00 Rank (Low Best) 5 1 1 1 1 Distance to closest school (miles) 0.50 1.28 1.28 1.28 1.28 Rank (High Best) 5 1 1 1 1 Distance to closest airport (public) (miles) _ 1.52 1.33 1.41 1.33 1.89 Rank (High Best) 2 4 3 4 1 Distance to closest airport (private) (miles) 3.14 3.14 3.14 3.14 3.14 Rank (High Best) 1 1 1 1 1 Total Score 18 11 12 11 10 Overall Rank 5 2 4 2 1 Residences and Other Structures Residences within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Residences within 75 - 200 ft of centerline 7.00 0.00 2.00 0.00 2.00 Rank (Low Best) 5 1 3 1 3 Total residences within 200 ft of centerline _ _ 7.00 0.00 2.00 0.00 2.00 Rank (Low Best) 5 1 3 1 3 Total residences within 500 ft of centerline 16.00 5.00 7.00 6.00 5.00 Rank (Low Best) 5 1 4 3 1 Other structures within 75 ft of centerline _ 1.00 0.00 0.00 0.00 0.00 Rank (Low Best) 5 1 1 1 1 Other structures within 75 - 200 ft of centerline 1.00 0.00 0.00 0.00 2.00 Rank (Low Best) 4 1 1 1 5 Number of parcels within 75 ft of centerline 44.00 29.00 34.00 33.00 35.00 Rank (Low Best) 5 1 3 2 4 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Number of communication facilities within 75 - 200 ft of centerline 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Total Score 32 9 18 12 20 Overall Rank 5 1 3 2 4 Natural Resources a Length crossing wetlands (miles) 0.90 0.08 0.08 0.08 0.00 Rank (Low Best) 5 2 2 2 1 Length crossing S. Platte River (miles) 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1. Number of perennial waterway crossings (excluding S. Platte) _ 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Number of intermittent waterway crossings 0.00 1.00 1.00 1.00 0.00 Rank (Low Best) 1 3 3 3 1 Number of ditch crossings 4.00 3.00 4.00 3.00 4.00 Rank (Low Best) 3 1 3 1 3 Length crossing probable playa (miles) 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Length crossing important game species habitat (miles) 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 Length crossing important avian habitat (miles) 0.54 0.00 0.00 0.00 0.00 Rank (Low Best) 5 1 1 1 1 Total Score 19 12 14 12 11 Overall Rank 5 2 4 2 1 Cultural Resources Number of NRHP sites within 1/4 mile 0.00 0.00 _ 0.00 _ 0.00 _ 0.00 Rank (Low Best) 1 1 1 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery. Colfer Substation to Rattlesnake Ridge Substation Route A Route B Route C Route D Route E Route F Selected Routes Alternative Route 3 Route 1 Alternative Route 2 Fl, F2, F4, F5, Ell, F16, Fl, F2, F4, F5, Ell, F17, Segments Fl, F2, F3, F10, F13, F15 Fl, F2, F3, F10, F14 F12, F15 Fl, F2, F4, F6, F8, F12, F15 Fl, F2, F4, F6, F7, F15 F18, F15 Engineering Factors Overall length (miles) 8.59 9.16 8.46 8.58 10.20 8.13 Rank (Low Best) 4 5 2 3 6 1 Number of road crossings 3.00 2.00 2.00 5.00 4.00 2.00 Rank (Low Best) 4 1 1 6 5 1 Length adjacent to U.S. Highways (within 150 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to State Highways (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Number of State Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length adjacent to roads (within 75 ft) (miles) 1.37 0.92 1.09 2.91 0.68 0.50 Rank (High Best) 2 4 3 1 5 6 Length adjacent to parcel lines (within 75 ft) (miles) 4.11 5.05 5.06 5.35 7.09 4.32 Rank (High Best) 6 4 3 2 1 5 Length adjacent to existing transmission line (within 75 ft) (miles) 0.10 0.10 0.10 0.15 1.61 0.10 Rank (High Best) 3 3 5 2 1 5 Number of existing transmission line crossings 3.00 3.00 3.00 5.00 5.00 3.00 Rank (Low Best) 1 1 1 5 5 1 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles) ' 0.00 0.03 0.03 0.03 0.03 0.03 Rank (High Best) 6 4 4 2 2 1 Number of natural gas or oil pipeline crossings 1 0.00 1.00 1.00 1.00 1.00 1.00 Rank (Low Best) 1 2 2 2 2 2 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Number of railroad crossings 0.00 0.00 0.00 0.00 0.00 _ 0.00 Rank (Low Best) 1 1 1 1 1 1 Total length adjacent to linear features (miles) 2 5.26 5.47 5.76 5.90 7.24 4.76 Rank (High Best) 5 4 3 2 1 6 Percent length adjacent to linear features 61.19% 59.67% 68.07% 68.80% 71.05% 58.55% Rank (High Best) 4 5 3 2 1 6 Total Score 38 34 30 31 34 34 Overall Rank 6 3 1 2 3 3 Oil and Gas.and Industrial Factors Oil and gas wells within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Oil and gas wells within 200 ft 1.00 2.00 3.00 3.00 0.00 5.00 Rank (Low Best) 2 3 4 4 1 6 Oil and gas other facilities within 75 ft 0.00 0.00 1.00 1.00 0.00 0.00 Rank (Low Best) 1 1 5 5 1 1 Oil and gas other facilities within 200 ft 7.00 7.00 4.00 4.00 4.00 2.00 Rank (Low Best) 5 5 2 2 2 1 Water wells within 75 ft 3.00 3.00 4.00 5.00 0.00 0.00 Rank (Low Best) 3 3 5 6 1 1 Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total Score 12 13 17 18 6 10 Overall Rank 3 4 5 6 1 2 Jurisdiction/Land Use Factors Center pivots within 75 ft 4.00 4.00 13.00 7.00 1.00 7.00 Rank (Low Best) 2 2 6 4 1 4 Length on state land board (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 Length in municipal land (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length in subdivision (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Distance to closest school (miles) 3.34 3.34 3.34 3.34 3.34 3.34 Rank (High Best) 1 1 1 1 1 1 Distance to closest airport (public) (miles) 3.34 3.34 3.34 3.34 3.34 3.34 Rank (High Best) 1 1 1 1 1 1 Distance to closest airport (private) (miles) 3.14 3.14 2.98 2.61 2.61 2.98 Rank (High Best) 1 1 3 5 5 3 Total Score 8 8 14 14 11 12 Overall Rank 1 1 5 5 3 4 Residences and Other Structures_ Residences within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Residences within 75 - 200 ft of centerline 4.00 5.00 2.00 1.00 2.00 2.00 Rank (Low Best) 5 6 2 1 2 2 Total residences within 200 ft of centerline 4.00 5.00 2.00 1.00 2.00 2.00 Rank (Low Best) 5 6 2 1 2 2 Total residences within 500 ft of centerline 11.00 10.00 4.00 6.00 3.00 3.00 Rank (Low Best) 6 5 3 4 1 1 Other structures within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Other structures within 75 - 200 ft of centerline 1.00 1.00 0.00 0.00 0.00 0.00 Rank (Low Best) 5 5 1 1 1 1 Number of parcels within 75 ft of centerline 42.00 45.00 31.00 37.00 46.00 29.00 Rank (Low Best) 4 5 2 3 6 1 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Number of communication facilities within 75 - 200 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total Score 29 31 14 14 16 11 Overall Rank 5 6 2 2 4 1 Natural Resources Length crossing wetlands (miles) 0.11 0.11 0.00 0.00 0.04 0.00 Rank (Low Best) 5 5 1 1 4 1 Length crossing S. Platte River (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Number of perennial waterway crossings (excluding S. Platte) 0.00 0.00 0.00 2.00 6.00 0.00 Rank (Low Best) 1 1 1 5 6 1 Number of intermittent waterway crossings 0.00 0.00 0.00 2.00 5.00 0.00 Rank (Low Best) 1 1 1 5 6 1 Number of ditch crossings 5.00 5.00 2.00 2.00 2.00 2.00 Rank (Low Best) 5 5 1 1 1 1 Length crossing probable playa (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Length crossing important game species habitat (miles) 0.00 0.53 0.44 1.95 1.95 0.44 Rank (Low Best) 1 4 2 5 5 2 Length crossing important avian habitat (miles) 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 Total Score 17 20 10 21 26 10 Overall Rank 3 4 1 5 6 1 Cultural Resources _ Number of NRHP sites within 1/4 mile 0.00 0.00 0.00 _ 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery. Rattlesnake Ridge Substation to Neres Canal Substation Route A Route B Route C Route D Route E Route F Route G Route H Selected Routes Alternative Route 2 Alternative Route 3 Route 1 A ternative Route 4 61, 63, 65, 66, 610, 61, 63, 67, 68, 610, 61, 63, 67, 611, 613, 61, 64, 69, 611, 61, G4, G9, G11, Segments 61, 62, 66, 610, 614 61, 63, 67, 611, 615 614 614 G14 61, 64, 612, 615 615 615 Engineering Factors Overall length (miles) 5.56 6.15 6.35 6.20 6.34 732 7.70 7.64 Rank (Low Best) 1 2 5 3 4 6 8 7 Number of road crossings 11.00 6.00 9.00 7.00 9.00 6.00 9.00 6.00 Rank (Low Best) 8 1 5 4 5 1 5 1 Length adjacent to U.S. Highways (within 150ft) (miles) 0.00 0.00 _ 0.00 _ 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 1 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length adjacent to State Highways (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 1 1 Number of State Highways crossings 0.00 0.00 _ 0.00 _ 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length adjacent to roads (within 75 ft) (miles) 3.81 0.58 2.49 1.16 1.53 1.48 2.43 1.48 Rank (High Best) 1 8 2 7 4 6 3 5 Length adjacent to parcel lines (within 75 ft) (miles) 4.08 2.87 3.26 2.39 2.99 5.80 5.91 5.26 Rank (High Best) 4 7 5 8 6 2 1 3 Length adjacent to existing transmission line (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 1 1 Number of existing transmission line crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length adjacent to existing natural gas or oil pipeline (within 75 ft) (miles) 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 1 1 1 Number of natural gas or oil pipeline crossings ' 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length adjacent to railroad (within 75 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (High Best) 1 1 1 1 1 _ 1 1 1 Number of railroad crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Total length adjacent to linear features (miles) 2 4.58 0.53 3.26 1.67 1.59 2.98 4.04 2.12 Rank (High Best) 1 8 3 6 7 4 2 5 Percent length adjacent to linear features 82.35% 8.59% 51.38% 26.88% 25.06% 39.65% 52.46% 27.71% Rank (High Best) 1 8 3 6 7 4 2 5 Total Score 25 36 30 38 36 29 29 31 Overall Rank 1 6 4 8 6 2 2 5 Oil and Gas and Industrial Factors Oil and gas wells within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Oil and gas wells within 200 ft 0.00 0.00 0.00 0.00 0.00 4.00 4.00 4.00 Rank (Low Best) 1 1 1 1 1 6 6 6 Oil and gas other facilities within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.0.0 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Oil and gas other facilities within 200 ft 5.00 2.00 7.00 4.00 3.00 7.00 8.00 5.00 Rank (Low Best) 4 1 6 3 2 6 8 4 Water wells within 75 ft 1.00 1.00 0.00 0.00 1.00 5.00 5.00 4.00 Rank (Low Best) 3 3 1 1 3 7 7 6 . Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Total Score 10 7 10 7 8 21 23 18 Overall Rank 4 1 4 1 3 7 8 6 Jurisdiction/Land Use Factors Center pivots within 75 ft 0.00 0.00 0.00 0.00 0.00 2.00 2.00 2.00 Rank (Low Best) 1 1 1 1 1 6 6 6 Length on state land board (miles) 0.94 0.00 0.94 0.52 0.03 0.00 0.03 0.00 Rank (High Best) 1 6 1 3 4 6 4 6 Length in municipal land (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length in subdivision (miles) 0.80 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 8 1 1 1 1 1 1 1 Distance to closest school (miles) 6.95 6.95 6.95 6.95 6.95 6.95 6.95 6.95 Rank (High Best) 1 1 1 1 1 1 1 1 Distance to closest airport (public) (miles) 2.69 2.69 2.69 2.69 2.69 2.69 2.69 2.69 Rank (High Best) 1 1 1 1 1 1 1 1 Distance to closest airport (private) (miles) 3.88 3.78 3.88 3.88 3.88 3.78 3.88 3.78 Rank (High Best) 1 6 1 1 1 6 1 6 Total Score 14 17 7 9 10 22 15 22 Overall Rank 4 6 1 2 3 7 5 7 Residences.and Other Structures Residences within 75 ft of centerline 0.00 0.00 0.00 _ 0.00 0.0.0 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Residences within 75 - 200 ft of centerline 3.00 0.00 0.00 0.00 0.00 2.00 2.00 1.00 Rank (Low Best) 8 1 1 1 1 6 6 5 Total residences within 200 ft of centerline 3.00 0.00 0.00 0.00 0.00 2.00 2.00 1.00 Rank (Low Best) 8 1 1 1 1 6 6 5 Total residences within 500 ft of centerline 20.00 11.00 _ 12.00 11.00 11.00 14.00 14.00 12.00 Rank (Low Best) 8 1 4 1 1 6 6 4 Other structures within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 Rank (Low Best) 1 1 1 1 1 6 6 6 Other structures within 75 - 200 ft of centerline 0.00 1.00 0.00 0.00 1.00 2.00 2.00 2.00 Rank (Low Best) 1 4 1 1 4 6 6 6 Number of parcels within 75 ft of centerline 32.00 32.00 28.0. 0 _ 27.00 33.00 35.00 33.00 33.00 Rank (Low Best) 3 3 2 1 5 8 5 5 Number of communication facilities within 75 ft of centerline 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Number of communication facilities within 75 - 200 ft of centerline 0.00 0.00 0.00 0.00 0.00 1.00 1.00 1.00 Rank (Low Best) 1 1 1 1 1 6 6 6 Total Score 32 14 13 9 16 46 43 39 Overall Rank 5 3 2 1 4 8 7 6 NaturalResources Length crossing wetlands (miles) 0.00 0.00 a00 0.00 0.00 0.11 0.11 0.11 Rank (Low Best) 1 1 1 1 1 6 6 6 Length crossing S. Platte River (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Number of perennial waterway crossings (excluding S. Platte) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Number of intermittent waterway crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Number of ditch crossings 1.00 1.00 1.00 1.00 1.00 7.00 7.00 7.00 Rank (Low Best) 1 1 1 1 1 6 6 6 Length crossing probable playa (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length crossing important game species habitat (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Length crossing important avian habitat (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 Total Score 9 9 9 9 9 19 19 19 Overall Rank 1 1 1 1 1 6 6 6 Cultural Resources. Number of NRHP sites within 1/4 mile 0.00 0.00 0.00 0.00 0.00 _ 0.00 0.00 0.00 Rank (Low Best) 1 1 1 1 1 1 1 1 1 Pipeline data are incomplete; these numbers based on Ventyx 2013 data. 2 Length adjacent to linear features (roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery. Neres Canal Substation to South Kersey Substation Route A Route B Route C Route D Route E Route F Route G Route) H Selected Routes Alternative Route 2 Route 1 Alternative Route 3 H1, H2, H12, H20, H24, H1, H3, H4, H12, H20, H1, 143, H4, HIS, H13, H1, H3, H4, H1S, H13, H1, H3, H4, H15, H10, H1, H3, HS, H7, H9, H14, H1, H3, HS, H6, H11, H1, H3, HS, H7, H8, H11, Segments H21 H24, H21 H18, H23, H24, H21 H16, H17, H19, H21 H14, H17, H19, H21 H17, H19, H21 H19, H21 H19, H21 Engineering Factors a Overall length(miles) 5.41 5.25 6.17 10.43 10.33 10.37 11.5I. 11A7 Rank(Low Best) 2 1 3 6 4 5 8 7 Number of road crossings 13.00 9.00 7.00 25.00 19.00 17.00 23.00 21.30 Rank(Low Best) 3 2 1 8 5 4 7 6 Length adjacent to U.S. Highways(within 150 ft) (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(High Best) 1 1 1 1 1 1 . 1 Number of U.S. Highways crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to State Highways(within 75 ft)(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank (High Best) 1 1 1 1 1 1 1 Number of State Highways crossings 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to roads(within 75 ft) (miles) 3.35 3.00 1.51 4.56 3.73 2.39 3.92 3.69 Rank(High Best) 5 6 8 1 3 7 2 4 Length adjacent to parcel lines(within 75 ft) (miles) 3.58 2.95 _ 4.03 7.38 6.57 6.91 8.26 8.39 Rank(High Best) 7 8 6 3 5 4 2 1 Length adjacent to existing transmission line(within 75 ft)(miles) 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 0.30 Rank (High Best) 1 1 1 1 1 1 1 Number of existing transmission line crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to existing natural gas or oil pipeline(within 75 ft) (miles)` 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(High Best) 1 1 1 1 1 1 . 1 Number of natural gas or oil pipeline crossings' 0.00 0.00 0.00 0.00 0.00 0.0 0 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Length adjacent to railroad(within 75 ft)(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank (High Best) 1 1 1 1 1 1 1 Number of railroad crossings 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 : 1 Total length adjacent to linear features (miles)z _ 3.97 3.40 2.42 5.26 5.23 4.75 6.35 6.58 Rank(High Best) 6 7 8 3 4 5 2 1 Percent length adjacent to linear features 73.52% 64.69% 39.18% 50.41% 50.53% 4522% 55.17% 57.39% Rank(High Best) 1 2 8 6 5 7 4 3 Total Score 33 34 36 31 31 35 3:. Overall Rank 5 6 8 2 1 2 1 7 • i., - and Industrial Factors la - OH and gas wells within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.30 Rank (Low Best) 1 1 1 1 1 1 8 1 Oil and gas wells within 200 ft 1.00 1.00 1.00 1.00 1.00 5.00 9.00 5i30 Rank(Low Best) 1 1 1 1 1 6 8 6 Oil and gas other facilities within 75 ft 0.00 1.00 1.00 4.00 2.00 1.00 1.00 1.30 Rank(Low Best) 1 2 2 8 7 2 2 2 Oil and gas other facilities within 200 fi 15.00 16.00 9.00 25.00 18.00 18.00 24.00 21.30 Rank(Low Best) 2 3 1 8 4 4 9 6 Water wells within 75 ft 0.00 0.00 1.00 6.00 6.00 8.00 8.00 15 00 Rank (Low Best) 1 1 3 4 4 6 6 8 Mines within 75 ft 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank (Loy,: Best) 1 1 1 1 1 1 1 Total Score 6 8 8 22 17 Overall Rank 1 2 2 6 4 _weadorsa_ ili ril M I 11 i I I S. Center pivots within 75 ft 3.00 3.00 6.00 17.00 15.00 15.00 17.00 16.00 Rank(Low Best) 1 1 3 7 4 4 7 6 Length on state land board(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(High Best) 1 1 1 1 1 1 : 1 Length in municipal land(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Length in subdivision(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Distance to dosest school (miles) 6.27 6.27 6.27 6.27 6.27 6.27 6.27 6.27 Rank(High Best) 1 1 1 1 1 1 _ 1 Distance to dosest airport(public)(miles) 1.33 1.33 1.67 1.92 2.00 2.00 2.00 2.bo Rank(High Best) 7 7 6 5 1 1 _ 1 Distance to dosest airport(private)(miles) 0.54 0.54 0.28 0.51 0.51 0.51 0.5: 0. 1 Rank(High Best) 1 1 8 3 3 3 3 3 Total Score 13 13 21 19 12 12 15 Overall Rank 3 3 8 7 1 6 dances and Other Structures Residences within 75 ft of centerline 0.00 0.00 _ 0.00 0.00 0.00 0.00 0.00 0.30 Rank (Low Best) 1 1 1 1 1 1 . 1 Residences within 75-200 ft of centerline 6.00 6.00 6.00 15.00 12.00 12.00 15.00 14 Rank(Low Best) 1 1 1 7 4 4 ' 6 Total residences within 200 ft of centerline 6.00 6.00 6.00 15.00 12.00 12.00 15.00 14 Rank(Low Best) 1 1 1 7 4 4 1 6 Total residences within 500ft of centerline 22.00 20.00 _ 17.00 42.00 43.00 36.00 40.00 39.70 Rank(Low Best) 3 2 1 7 8 4 6 5 Other structures within 75 ft of centerline 0.00 0.00 _ 0.00 1.00 1.00 1.00 1.00 1.30 Rank (Low Best) 1 1 1 4 4 4 4 4 Other structures within 75- 200 ft of centerline 4.00 2.00 4.00 7.00 7.00 10.00 14.00 12 00 Rank(Low Best) 2 1 2 4 4 6 8 7 Number of parcels within 75 ft of centerline 43.00 36.00 _ 33.00 68.00 _ 67.00 67.00 73.00 74.)0 Rank(Low Best) 3 2 1 6 4 4 • 8 Number of communication facilities within 75 ft of centerline 0.00 0.00 _ 0.00 0.00 _ 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 . 1 Number of communication facilities within 75 - 200 ft of centerline 2.00 0.00 0.00 0.00 0.00 0.)0 100 0.00 Rank(Low Best) 8 1 1 1 1 1 : 1 Total Score 21 11 10 38 31 29 4:! Overall Rank 3 2 1 6 5 4 E '". Length crossing wetlands(miles) 0.03 0.03 0.03 0.00 0.00 0.00 0.00 0.10 Rank(Low Best) 6 6 6 1 1 1 : 1 Length crossing S. Platte River(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1. 1 1 1 1 1 _ 1 Number of perennial waterway crossings(excluding S. Platte) 0.00 0.00 0.00 1.00 1.00 1.00 1.00 1.10 Rank(Low Best) 1. 1 1 4 4 4 4 4 Number of intermittent waterway crossings 2.00 3.00 3.00 1.00 2.00 0.00 0.00 0.00 Rank (Low Best) 5 7 7 4 5 1 1 Number of ditch crossings 3.00 3.00 4.00 9.00 6.00 6.00 12.00 12 00 Rank(Low Best) 1. 1 3 6 4 4 7 Length crossing probable playa(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1. 1 1 1 1 1 1 Length crossing CNHP Potential Conservation Areas(miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Rank(Low Best) 1. 1 1 1 1 1 1 Length crossing important game species habitat(miles) 0.00 0.00 0.00 0.00 _ 0.00 0.00 0.00 0.00 Rank (Low Best) 1. 1 1 1 1 1 1 Length crossing important avian habitat (miles) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.30 Rank(Low Best) 1 1 1 1 1 1 1 Total Score 18 _ 20 22 20 -11= 19 15 yS ,: Overall Rank 2 6 8 6 5 1 Qidtural,:---.• •r . z Number of NRHP sites within 1/4 mile 0.00 0.00 0.00 0.00 0.0.0 0.00 0.00 0.30 Rank (Low Best) 1 1 1. 1 1 1 1 1 Pipeline data are incomplete;these numbers based on Ventyx 2013 data 2 Length adjacent to linear features(roads, rail, transmission, distribution, ditches) was digitized based on 2014 aerial imagery rTRI - STATE GENERATION AND TRANSMISSION ASSOCIATION , INC. HEADQUARTERS : P.O . BOX 33695 DENVER , COLORADO 80233 -0695 303 -452 -6111 Electric and Magnetic Fields (EMF ) Electric and magnetic fields (EMF) are found wherever there is a flow of electricity, such as in the use of electric lights, appliances, computers, power lines, home wiring and any other devices that carry or use electricity. The Earth itself also creates natural EMF in varying amounts. Therefore , we are all continuously exposed to EMF as a result of living in a society that so heavily relies on the use of electricity as a source of energy. Some members of the public have raised concerns about EMF and health issues. We at Tri- State Generation and Transmission Association are aware of these concerns and we wish to express our position on EMF and our commitment to this matter. Over the past four decades, thousands of scientific studies on EMF have been conducted around the world . This very large body of research has been evaluated by leading public health organizations , such as the World Health Organization (WHO) and the U . S . National Institute of Environmental Health Sciences (NIEHS). The WHO currently concludes that "despite extensive research , to date there is no evidence to conclude that exposures to low level electromagnetic fields is harmful to human health ." The U . S . NIEHS reached a similar conclusion in an earlier report, finding only "weak" and "marginal" evidence that EMF from electric power could affect health . The U . S . government has not recommended the standards for public exposures to electric power EMF . The WHO has endorsed the exposure limits adopted by the International Commission on Non-Ionizing Radiation ( ICNIRP) and the International Committee for Electromagnetic Safety ( ICES) . These limits are 2 , 000 mG ( ICNIRP) and 9 ,040 mG ( ICES ) . The EMF levels that members of the public could experience from Tri-State power lines are well below these recommended exposure limits. Tri-State recognizes its responsibility to provide wholesale electric service at the lowest possible cost in a manner that is safe, reliable and environmentally sound . This responsibility includes designing and locating our facilities in accordance with the National Electric Safety Code and applicable federal , state and local regulations . In addition , even though electric power EMF have not been shown to cause adverse health effects, we will continue where reasonable and practicable to design and operate new facilities in a way that will lower EMF from those facilities. Tri-State continues to support credible scientific research on EMF as a sponsor of the EMF research program of the Electric Power Research Institute. We will continue to monitor the results of these and other scientific studies, will provide information about EMF issues to our member systems, our employees and our electric consumers and will respond promptly to inquiries. 5/2012 Hello