The URL can be used to link to this page

Browse Search

Home My WebLink About20200834.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE: AMOUNT $ APPLICATION RECEIVED BY DATE RECEIVED. CASE # ASSIGNED: PLANNER ASSIGNED: PROPERTY INFORMATION (Attach additional sheets if necessary.) Is the property currently in violation? • No / Site Address: N\A Yes Violation Case Number: Parcel Number: 0 4 3 - 2 6 - 0 _ 0 0 _ 0 1 1 Legal Description: NWSW Section: 26 , Township 12 N, Range 63 W Zoning District: A Acreage: 158 Within subdivision? l■1 No / If yes. subdivision or townsite name: N"A 1 Yes Townsite? I i No / Yes Floodplain Is] No / 7 Yes Geological Hazard E] No / [ i Yes Airport Overlay L1 No / PROPERTY OWNER(S) (Attach additional sheets if necessary.) Name: John L and Sharon A Peters Yes Company: Name of proposed business: Phone #: 970-895-2305 Email: Street Address: PO Box 37 City/State/Zip Code: Hereford, CO 80732 Name: Company: Phone #: Email: Street Address: City/State/Zip Code: APPLICANT/AUTHORIZED AGENT (Authorization must be included if there is an Authorized Agent.) Name: Doug Dennison Company: HighPoint Operating Corporation Phone #: 970-353-0407 x6015 Email: ddennison@hpres.com Street Address: 33105 WCR 33 City/State/Zip Code: Greeley. CO 80631 I (We) hereby depose and state under penalties of perjury that all statements. proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our) knowledge. All fee owners of the property must sign this application. If an Authorized Agent signs. an Authorization Form signed by all fee owners must be included with the application. If the fee owner is a corporation, evidence must be included indicating the signatory has the legal authority to sign for the corporation. Signature Doug Dennison 11/14/19 Date Signature Date Print Print 7/29/2019 7 DEPARTMENT OF PLANNING AND BUILDING DEPARTMENT OF PUBLIC HEALTH AND ENVIRONNMENT 1555 NORTH 17TH AVENUE GREELEY, CO 80631 AUTHORIZATION FORM FOR BUILDING, PLANNING AND HEALTH DEPARTMENT PERMITS AND SERVICES John L and Sharon A Peters Doug Dennison (HighPoint Resources; I, (We), , give permission to (Owner — please print) (Applicant/Agent — please print) to apply for any Planning, Building or Health Department permits or services on our behalf, for the property located at: Parcel 004326000011 SW4 26 12 63 00 Legal Description: of Section , Township N, Range W Subdivision Name: Property Owners Information: 970-895-2305 Phone: E-mail: Lot Block Applicant/Agent Contact Information: 970-353-0407 x6015 ddennison@hpres corn Phone: E -Mail: Email correspondence to be sent to: Owner l l Applicant/Agent D Both n Postal service correspondence to be sent to: (choose only one) Owner l !_ Applicant/Agent Additional Info: 0 Owner Signature: Owner Signature: Date: /O —1, -- / Date: 1 0 ^ ( - ( 7/29/2019 9 HighPoint RESOURCES USR QUESTIONNAIRE FOX CREEK 26 Compressor Station Planning Questions: Planner on Call 970-400-6100 1. Explain. in detail, the proposed use of the property. Include. at a minimum, the following: a. Type of use for which the application is being made. HighPoint Operating Corporation (HPOC) is proposing to construct a compressor station in the Agriculture (A) zone district in the NWSW Section 26. T 12N. R 63W. The station will be located on property owned by John L. Peters and Sharon A. Peters. The station will be permitted for up to three natural gas -powered compressors. In addition. associated equipment such as production equipment, tanks and meters will be installed at the site. The station will be fenced to keep livestock and unauthorized individuals out and will be equipped with lights that can be controlled so that they are on only when personnel are present during nighttime hours. b. Current or previous use of the land, if any. The proposed facility will be located on lands that are currently non -irrigated rangeland located in a rural area with existing oil and gas activity. The placement and size of the facility will allow for the current agricultural to persist. c. Include a statement delineating the need for the proposed use. Ongoing development of oil and gas resources in the area surrounding the proposed compressor station necessitates the need for additional compression to serve two purposes. The first purpose is for gas gathering in that HPOC must compress gas to a pressure that is required by third -party gathering companies. Without this additional compression, HPOC would be unable to sell the produced gas to these gathering companies which would result in wells being shut in. The second purpose for the additional compression is for gas lift, which is a technique where gas produced in wells is pressurized and reintroduced into the wells to facilitate lifting liquids, oil and water. to the surface without the need for mechanical pumping units. By centralizing compression on a single location such as is proposed for the Fox Creek 26 Compressor Station. HPOC is able to eliminate compressors on individual well sites which reduces the overall impact to neighboring properties. When this compressor station is in operation. HPOC will be able to remove a compressor on a well site that is in close proximity to the residence of John and Sharon Peters. d. Describe the uses surrounding the site and explain how the proposed use is compatible with them. The proposed Fox Creek 26 Compressor Station is surrounded by agricultural properties and is located in an area with existing oil and gas activity. The compression of natural gas is a necessary component of the oil and gas industry: therefore, the proposed use is compatible to the surrounding land use. e. Describe the proximity of the proposed use to residential structures. There are no residential structures within 3.600 feet of the proposed Fox Creek 26 Compressor Station. f. Describe the hours and days of operation (e.g. Monday thru Friday 8:00 a.m. to 5:00 p.m.) The facility will operate 24 hours a day. seven days a week. However, typical access in and out of the facility will occur during daylight hours except during maintenance situations in which the station is not operating at peak efficiency or other situations that could require immediate attention. g. Describe the number of shifts and the maximum number of employees per shift. After construction has been completed. the station will be unmanned. The station will be monitored and operated remotely, and personnel will visit the station on an as - needed basis. h. Describe the maximum number of users, patrons, members. buyers or other visitors that the use by special review facility is designed to accommodate at any one time. As noted above, the station will be unmanned. so no personnel will work at the station on a full-time basis. HPOC and contractor personnel will visit the station intermittently and. excluding off -normal situations. primarily during daylight hours. During the construction phase, upwards of 20 personnel could be on site at peak construction times. The construction phase is slated to last approximately 19 weeks. During operations phase. the station will be visited by up to 2 people (pumper. mechanic) each day for maintenance for short periods. In addition, at least once a month. for a period of two to three days. the site would be visited by approximately three trucks for schedule monthly maintenance. Approximately one tanker truck per day will visit the station to transport oil. List the types and maximum numbers of animals to be on the site at any one time (for dairies, livestock confinement operations. kennels, etc.). Not Applicable. List the types and numbers of operating and processing equipment to be utilized. At full build -out. the following equipment will be located on this facility - - 3 natural-gas powered compressors in skid -mounted buildings - 3 combustors 2 fuel -gas scrubbers - 1 air compressor with possible building Meters with possible building 1 knockout drum - 3 840 -barrel oil tanks - 1 840 -barrel water tank - 2 inlet slug catchers - 1 heater treater - 1 flash -gas scrubber - 3 2 -phase separators 3 filter coalescers - 1 vapor recovery tower (VRT) 4 vapor recovery units (VRU) k. List the types, number and uses of the proposed structures to be erected. Each of the 3 natural-gas compressors will be contained in pre -fabricated (Resolution 35 certified) skid -mounted steel frame buildings. It is possible that the air compressor and meters will be housed in small buildings, and the appropriate permits for these buildings will be obtained from Weld County. Describe the size of stockpile. storage or waste areas to be utilized. if any. See below under -Environmental Health Questions" for detail of how wastes will be managed. m Describe the method and time schedule of removal or disposal of debris, junk and other wastes associated with the proposed use. As noted below under ,.Environmental Health Questions contractors will be utilized to empty/replace dumpsters and other waste containers on a regular basis. n. Include a time table showing the periods of time required for the construction of the operation The following is a general time table for the major phases of construction - - Civil/dirt work — 1 week - Delivery and installation of equipment — 16 weeks - Commissioning — 2 weeks o. Describe the type of lot surface proposed and the square footage of each type (e g. asphalt. gravel. landscaping. dirt, grass. buildings). All access roads and the compressor station site an associated equipment area will be surfaced with road base or gravel. p. How many parking spaces are proposed? How many handicapped (ADA) parking spaces are proposed? Not applicable. q. Describe the proposed screening for all parking and outdoor storage areas. Not applicable. r. Describe the existing and proposed landscaping for the site. All access roads and the compressor site and associated equipment area will be surface with road base or gravel. No vegetation will be within the station footprint for safety (fire hazard) reasons. s. Describe the type of fence or other screening proposed for the site. The facility will be surrounded by a barbed-wire fence to preclude livestock from entering the facility. No screening is proposed at this time. t. Describe reclamation procedures to be employed as stages of the operation are phased out or upon cessation of the Use by Special Review activity. If the station is removed in the future. HPOC would reclaim the site to its original state. u. Describe the proposed fire protection measures. This facility will be constructed with equipment that will detect conditions where fire or explosion could occur. This equipment includes LEL (lower explosive limit) meters and fire eyes that will be configured to immediately and automatically shut the facility down if a dangerous situation is present. Additionally, appropriate fire extinguishers will be installed throughout the facility and BBC personnel will receive regular training on the maintenance and use of the extinguishers. The primary fire response agency for this facility will be the Pawnee Fire Protection District. Prior to operation of the facility, HPOC will provide an emergency response plan to the fire district and conduct a walk-through of the facility with district personnel to familiarize them with the facility. 2. Explain how this proposal is consistent with the Weld County Comprehensive Plan. HPOC has reviewed the Comprehensive Plan as outlined in Chapter 22 of the Weld County Code and believes this project is consistent with its guiding principles. Section 22- 2-10(D) emphasizes extraction of natural resources as an important part of the economy and should minimize impacts to agricultural lands. The proposed facility will be located on lands that are currently non -irrigated rangeland located in a rural area with existing oil and gas activity. The placement and size of the facility will allow for the current agricultural to persist. 3. Explain how this proposal is consistent with the intent of the zone district in which it is located. (Intent statements can be found at the beginning of each zone district section in Article III of Chapter 23.) The natural gas compressor station is classified by Weld County as an Oil and Gas Support and Services facility. Section 23-3-40.A.2 of the Weld County Code states that these facilities are uses allowed to be constructed. occupied. operated and maintained in the A (Agricultural) Zone District only upon approval of a Use by Special Review permit in accordance with the requirements and procedures set forth in Article II. Division 4 of Chapter 23. 4. Explain how this proposal will be compatible with future development of the surrounding area or adopted master plans of affected municipalities. The surrounding area is used for agricultural (dry -land grazing) and oil and gas production. The facility will be constructed and maintained to limit the impact to agricultural operations. The facility is a key component to existing and future oil and gas development in this area. 5. Explain how this proposal complies with Article V and Article XI of Chapter 23 if the proposal is located within any Overlay Zoning District (Airport. Geologic Hazard. or Historic Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps officially adopted by the County. The proposed Fox Creek 26 Compressor Station location is not located within and Overlay Zoning District. 6. If the proposed use is to be located in the A (Agricultural) Zone District. explain your efforts to conserve prime agricultural land in the locational decision for the proposed use. The location for the proposed Fox Creek 33 Compressor Station is classified as High Potential Dry Cropland — Prime if they Become Irrigated. At the current time, there are no plans for these lands to be irrigated and the lands likely will continue to be used for livestock grazing. The location for the compressor station was chosen to be in close proximity to an existing well pad to limit the overall impact to ongoing agricultural operations and the station will be fenced to prevent livestock from being able to access the facility. 7. Explain whether this proposal interferes with the protection of the health. safety and welfare of the inhabitants of the neighborhood and the County. Because of the rural and relatively isolated location proposed for this compressor station, it will not interfere with the protection of the health. safety and welfare of neighbors and the County. Environmental Health Questions: 970-400-2702 1. What is the drinking water source on the property? If utilizing a drinking water well include either the well permit or well permit application that was submitted to the State Division of Water Resources. If utilizing a public water tap include a letter from the Water District, a tap or meter number, or a copy of the water bill. Because the site will be unmanned, no drinking water source is required. Personnel who visit the station will be provided with bottled water. 2. What type of sewage disposal system is on the property? If utilizing an existing septic system provide the septic permit number. If there is no septic permit due to the age of the existing septic system, apply for a septic permit through the Department of Public Health and Environment prior to submitting this application. If a new septic system will be installed please state "a new septic system is proposed." Only propose portable toilets if the use is consistent with the Department of Public Health and Environment's portable toilet policy. The station will be equipped with a portable toilet that will be serviced by a licensed contractor. 3. If storage or warehousing is proposed, what type of items will be stored? No storage or warehousing is proposed. 4. Describe where and how storage and/or stockpile of wastes. chemicals. and/or petroleum will occur on this site. HPOC maintains a corporate Waste Management Plan that covers the management of wastes typically associated with our operations. This plan is used to determine how to manage common wastes. The objective of the plan is to ensure that generation of wastes is minimized and materials are reused or recycled whenever possible. When that is not possible. the plan is utilized to ensure that wastes are managed in accordance with all Local. State. and Federal regulations. HPOC personnel are trained on waste management practices. HPOC anticipates that the following wastes will be generated at the site: • Used oil • Used antifreeze (ethylene glycol) • Tank bottoms • Spent filters • Light bulbs • Spent batteries • Rags and absorbent socks and pads • Hydrocarbon impacted oil from minor leaks and vehicle traffic • Used packaging material, including cardboard, scrap lumber from crates, metal strapping. etc. A small dumpster will be placed on site and municipal solid waste will be managed by Waste Management Incorporated or similar company. The dumpster will be emptied weekly or bi-weekly. A RCRA Universal Waste program will be set up and managed by Clean Harbors Incorporated for the proper management or recycling of universal wastes such as spent batteries and light bulbs. Used oil. antifreeze. filters. and rags and pads will be managed by either January Environmental Services Incorporated or Tri-State Oil Reclaimers. When necessary. tank bottoms will be removed and sent to an authorized disposal facility. This activity will be coordinated by Clean Harbors Incorporated. In addition. a licensed contractor will provide portable toilet service on location Spills and releases will be managed in accordance with the facilities SPCC Plan and HPOC's Emergency Response Plan. Hydrocarbon impacted soils will be removed from the facility as needed and disposed of at Waste Management Incorporated's landfill in Ault, Colorado. In the event a change in contractors is necessary in the management or disposal of waste, a state authorized provider would be utilized. Oil and produced water that are separated from the natural-gas stream on this location will be stored in 840 -bbl tanks prior to being transported from the location. These tanks will be surrounded by a steel -ring and synthetic liner secondary -containment system. The oil and water will be transported from the location periodically via tanker truck. 5. If there will be fuel storage on site. indicate the gallons and the secondary containment. State the number of tanks and gallons per tank. Not applicable. 6. If there will be washing of vehicles or equipment on site. indicate how the wash water will be contained Not applicable. 7. If there will be floor drains, indicate how the fluids will be contained. Not applicable. 8. Indicate if there will be any air emissions (e.g. painting, oil storage. etc.). The Fox Creek 26 Compressor Station will have air emissions associated with the proposed equipment. The facility will be permitted through and subject to the regulations promulgated by the Colorado Department of Public Health and Environment (CDPHE). 9. Provide a design and operations plan if applicable (e.g. composting, landfills. etc.). Not applicable. 10. Provide a nuisance management plan if applicable (e.g. dairies. feedlots. etc.). Not applicable. 11. Additional information may be requested depending on type of land use requested. Not applicable. Public Works Questions: 970-400-3767 1. Include a traffic narrative with the information below. A traffic impact study may be required. Improvements to adjacent streets/roads may be necessary to provide adequate safe and efficient transportation to and from the site. An Improvements Agreement may be required. a. The projected number of vehicle trips (average per day, maximum per day, peak hour data) to and from the site and the type of vehicles (passenger. semi -truck, etc.). Post -construction traffic will consist of 2-3 round trips per day for passenger vehicles (pickup trucks) and one round trip per day for a semi -truck. The peak hours for this traffic will vary but will generally be between the hours of 8 a.m. and 5 p.m. b. Describe how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups. Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = 1 trip in and 1 trip out of site). Post -construction traffic at the station will consist of 2-3 round trips per day for vehicles (pickup trucks) and one round trip per day for semi -trucks. c. Describe the expected travel routes for site traffic. All traffic accessing the station will travel west of WCR 71 on WCR 136.5 to a new access point to be permitted with Weld County. d. Describe the travel distribution along the routes (e.g. 50% of traffic will come from the north, 20% from the south, 30% from the east, etc.). 100 percent of the traffic will come from the west of WCR 71 as described above. It is estimated that approximately 90 percent of the traffic on WCR 71 will come from the south with the remainder corning from the north. e. Describe the time of day that you expect the highest traffic volumes to and from the site. The majority of traffic will occur during the hours of 8 a.m. to 5 p.m. 2. Describe where the access to the site is planned. Proposed access to the site will be from WCR 136.5 at a new access point to be permitted with Weld County. 3. Drainage Design: Design and construction of a detention pond as described in an approved Drainage Report is required unless the project falls under an exception to stormwater detention requirements per code. (See below.) Does your site qualify for an exception to stormwater detention? If so. describe in a drainage narrative the following: a. Which exception is being applied for? Include supporting documentation. b. Does the water flow onto the property from an offsite source? If so. from where? c. Describe where the water flows to as it leaves the property. d. Describe the direction of flow across the property. e. Describe the location of any irrigation facilities adjacent to or near the property. f. Describe any previous drainage problems with the property. HPOC has prepared a Drainage Report for the proposed site; it is included in the application package and includes the above requested information demonstrating the exception to stormwater detention requirements. 4. If your site does not qualify for an exception. the following applies: a. A Drainage Report summarizing the detention pond design with construction drawings and maintenance plan shall be completed by a Colorado Licensed Professional Engineer and adhere to the drainage related sections of the Weld County Code. b. The Drainage Report must include a certification of compliance. which can be found on the Public Works website. stamped and signed by the PE. c. See the attached Drainage Report Review Checklist. Not Applicable — see attached Drainage Report. Building Questions: 970-400-6100 1. List the type, size (square footage), and number of existing and proposed structures. Show and label all existing and proposed structures on the USR drawing. Label the use of the building and the square footage. Each compressor will be housed in a metal framed building of approximate dimensions of 22' x 40' x 16.5'. All facilities are shown and labeled on the USR drawing included in this USR Permit Application Package. It is also possible that the air compressor and meters will be housed in small buildings that will be permitted through Weld County. 2. Explain how the existing structures will be used for this USR. There are no existing structures at this location. 3. List the proposed use(s) of each structure. As noted above, each compressor will be housed in a metal framed building. It is also possible that the air compressor and meters will be housed in small buildings that will be permitted through Weld County. Weld County Treasurer Statement of Taxes Due Account Number R6782159 Parcel 004326200009 Legal Description NW4 26.12-63 LOT B REC EXEMPT RECX I2-0092 EXC MM Situs Address Account: R6782159 PETERS 313 RANCH INC PO BOX M CARPENTER, WY 82054-0397 Year Charges 2018 Tax Billed 5376.92 Payments $376.92 Balance $0.00 Grand Total Due as of 10,21/2019 $0.00 Tax Billed at 2018 Rates for Tax Area 1204 - 1204 Authority Mill Levy WELD COUNTY 15 .0380000 SCHOOL DIST RE12 9.0320000 PAWNEE FIRE 11500000 AIMS JUNIOR COLLEGE 6 3050000 HIGH PLAINS LIBRARY 3.2520000 WEST GREELEY CONSERVATION 0.4140000 Taxes Billed 2018 • Credit Levy Amount 5160.61 596.47 513 35 567.34 S34.73 54.42 352910000 $376.92 Values AG -DRY FARM LAND AG -GRAZING LAND AG -WASTE LAND Total Actual S34,341 $2,453 5,4 Assessed $9,960 5710 $10 $36,808 S10,680 ALL TAX LIEN SALE AMOUNTS ARE SUBJECT TO CHANGE DUE TO ENDORSEMENT OF CURRENT TAXES BY THE LIENHOLDER OR TO ADVERTISING AND DISTRAINT WARRANT FEES. CHANGES MAY OCCUR AND THE TREASURER'S OFFICE WILL NEED TO BE CONTACTED PRIOR TO REMITTANCE AFTER THE con2 • rn ass en .. A fl Weld County Treasurer's Office 1400 N 17th Avenue PO Box 458 Greeley, CO 80632 Phone: 970-400-3290 Pursuant to the Weld County Subdivision Ordinance, the attached Statement of Taxes Due issued by the Weld County Treasurer are evidence that as of this date, all current and prior year taxes related to this parcel have been paid in full. Date: /0/il/i'? WELD COUNTY, COLORADO Drainage Report HIGHPOINT OPERATING CORPORATION FOX CREEK 26 SW COMPRESSOR SITE DRAINAGE REPORT SECTION 26, TOWNSHIP 12 NORTH, RANGE 63 WEST, 6TH P.M. COUNTY ROAD 136.5, WELD COUNTY, COLORADO Prepared For: HighPoint Operating Corporation Contact: Doug Dennison 33105 WCR 33 Greeley, CO 80631 Phone: (970) 353-0407x6015 Prepared By: Uintah Engineering & Land Surveying, LLC Christopher J. Clark, PE 85 South 200 East Vernal, UT 84078 Phone: (435) 789-1017 UINTAH ENGINEERING 6 LAND SJRVt Uintah Engineering & Land Surveying. LLC 85 South 200 East, Vernal. Utah 84078 Fox Creek 26 SW Compressor Site Drainage Report TABLE OF CONTENTS Table of Contents Certification ii 1. INTRODUCTION 1 II. General Location and Description 1 A. Location and Existing Conditions 1 B. Proposed Development 1 III. Drainage Basins and Subbasins 2 A. Major Basin Description 2 B. Offsite Drainage Basins 2 IV. Drainage Design Criteria 3 V. Drainage Facility Design 4 A. On -site Drainage — Western Pad Area 4 B. Water Quality and Detention 4 C. Conveyance Calculations (Hydrologic Capacities) 5 VI. conclusion 5 VII. Appendix 6 Appendix A — Vicinity Map 6 Appendix B — Drainage Basin Plans 8 Appendix C — Flood Plain Map - FIRM Map Panel 11 Appendix D — Hydrologic Soil Group 13 Appendix E - NOAA Atlas 14 — Precipitation Values 18 Appendix F — Rational Method Runoff Calculations 20 Appendix G — Conveyance Calculations 26 Appendix H — Detention Pond Calculations 34 November 12, 2019 CERTIFICATION OF COMPLIANCE ENGINEERING DESIGNED TO WELD COUNTY CODE STANDARDS AND CRITERIA I Christopher J. Clark, PE , Consultant Engineer for HighPoint Resources ("Applicant"), understand and acknowledge that Applicant is seeking land use approval of Fox Creek 26 SW Compressor ("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) VARIANCE REQUEST l ) 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 Fox Creek 26 SW Compressor Site Drainage Report I. INTRODUCTION The purpose of this report is to present the proposed storm drainage improvements for the HighPoint Operating Corporation's proposed Fox Creek 26 SW Compressor site located in the NW1/4 SW 1/4 of Section 26, T12N, R63W, 6th P.M. With the development of a site, it can be expected to increase the impervious ground cover and thus, an increase in peak storm water runoff. This report examines the undeveloped flow patterns of off -site and on -site drainage basins and the proposed storm water facilities designed to mitigate the downstream impact of increased storm water runoff. The contents of this report are prepared in accordance with the Weld County Code for a Drainage Report in conjunction with a Use By Special Review submittal. II. GENERAL LOCATION AND DESCRIPTION A. LOCATION AND EXISTING CONDITIONS The proposed Fox Creek 26 SW Compressor site is located on an approximately 31.3 Acre parcel located south of WCR 136.5 and west of WCR 71 in Weld County. A vicinity map of the proposed site is included in Appendix A. This site is zoned Agricultural and is Non -Urbanizing. The existing land use is considered rangeland. HighPoint Operating Corporation is seeking to permit this development to operate an oil and gas compressor facility. Drainage at the proposed site currently sheet flows to the southeast across the range land. The head of a drainage, which is a tributary of the Little Crow Creek, begins to the west of the proposed site. A roadside drainage ditch flows west to east along WCR 136.5. The off -site drainage plan for the site is included with this report in Appendix B. PROPOSED DEVELOPMENT The improvements will include the development of a compressor site south of WCR 136.5. The proposed use area will be approximately 8.61 Acres in size and will include (3) three compressors and ancillary equipment including scrubbers, storage tanks, filters and separators. A topsoil stockpile will be located on east side of the pad. The site will include constructing a new access road to the north of the pad that accesses WCR 136.5. The vehicle travel areas of the site will be surfaced with gravel. There will be one detention pond located in the southwest corner of the proposed site. Offsite stormwater runoff will be collected into diversion ditches and will discharge through a riprap apron before being released into the historic drainage basin. Stormwater on the proposed pad will be collected into a series of ditches and will be conveyed into a detention basin located at the southwest corner of the site. The detention pond is sized to accommodate the 100 -year runoff volumes from the newly developed areas and will release the stormwater at a rate equivalent to the 10 -year historic (pre -development) runoff rate. The release rate will be managed by the use of an outlet structure with an orifice plate to treat and manage the Water Quality Capture Volume and then a second stage will discharge through an outlet pipe that is outfitted with a restrictor plate. The offsite drainage plan and developed drainage plan have been attached to this report in Appendix B. November 12, 2019 1 Fox Creek 26 SW Compressor Site Drainage Report III. DRAINAGE BASINS AND SUBBASINS A. MAJOR BASIN DESCRIPTION The subject property is located in rural Weld County and is surrounded by agricultural land to the north. and east and rangeland to the west and south. Several mineral. oil and gas facilities operate in nearby vicinity, including a facility (3MUSR18-13-0002) to the northeast of the proposed compressor facility, a facility (USR16-0032) to the south and a gravel mining operation (USR-721 & USR-817) to the west. The project site lies in a FEMA designated area, Zone X: "areas determined to be outside the 0.2% annual chance floodplain". The development site is located in Flood Insurance Rate Map (FIRM), Community Panel No. 08123C 0400E. attached to this report as Appendix C. According to the NRCS Web Soil Survey. the off -site basin consists of Ascalon fine sandy loam, 0 to 6 percent slopes. The on -site soils consist of Ascalon fine sandy loam, 0 to 6. The Ascalon fine sandy loam have high infiltration rates (low runoff potential) when thoroughly wet. The hydrologic soil group types at the compressor pad are Type B. Refer to the web soil survey reports included with this report in Appendix D. B. OFFSITE DRAINAGE BASINS The off -site drainage basin (0S-1) flows from the northwest of the site, across WCR-136.5 and to the north side of the site. The runoff from OS -1 is collected into Off -site Ditch -1. Off -site Ditch -1 conveys the runoff into Culvert - 2. From Culvert -2, the runoff is conveyed in the diversion ditch to a riprap apron, where it released into the historic drainage basin. The existing roadside drainage ditch conveys runoff into Culvert -1, which is located near WCR-136.5 and crosses the proposed access road. The existing roadside drainage ditch is shallow and will only collect a portion of the offsite runoff. Culverts 1 and 2 were sized to accommodate the full off -site runoff which is more conservative. Runoff coefficients are calculated for each site soil type using the methods detailed in the Urban Storm Drainage Criteria Manual, Volume 1, Ch. 5. The Rational Method will be used to analyze the historic peak flows. The time of concentration for the basin was estimated using the methods detailed within the Urban Storm Drainage Criteria Manual, Volume 1, Ch. 5. Peak flows for the 5 -year and 100 -year storm events for the off -site drainage basin have been provided in the table below. Table 1 - Off -site Drainage Basin Peak Runoff Flows. Basin ID Basin Size (Ac) Peak Flow 5-Yr (cfs) Peak Flow 100-Yr (cfs) Design Point OS -1 119.3 5.0 46.5 1 A Drainage Plan is included with this report showing the boundary of the off -site Drainage Basin. Reference the Off -site Drainage Plan in Appendix B. November t_', 2019 Fox Creek 26 SW Compressor Site Drainage Report IV. DRAINAGE DESIGN CRITERIA This report is prepared in compliance with the Urban Storm Drainage Criteria Manual. Volumes 1, 2, and 3; Weld County Code; and the Weld County Storm Drainage Criteria Addendum to the Urban Storm Drainage Criteria Manuals Volumes 1, 2. and 3. Based on this criterion. a 100 -year storm is used as the major storm event and a 5 -year storm is used as the minor storm event when evaluating existing and proposed drainage facilities. Runoff Calculations: For drainage basins less than 160 acres in area, the Rational Method was used to calculate the stormwater runoff. The time of concentraction for the basins was estimated using the methods detailed within Urban Storm Drainage Criteria Manual. Volume 1. Ch. 5. The hydrologic runoff calculations and time of concentration calculations are included with this report in Appendix F. Rainfall Data: Site rainfall depth information was obtained from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14, Volume 8. Version 2. Precipitation -Frequency Atlas of the United States (2013). This data supersedes the default rainfall depth information provided in the Urban Storm Drainage Criteria Manual. The current NOAA data was used for the determination of the point rainfall data. The NOAA data formed the basis of the inflow -duration -frequency (IDF) calculations for other storm frequencies and durations using Urban Drainage methods. Rainfall data is presented in Appendix E. Pipe and Culvert Sizing: Site storm infrastructure capacities have been evaluated using Manning's Equation. The culverts on -site were sized to convey the 5 -year storm event. The storm drain piping was also sized to convey the 5 -year storm event. Additionally. the outlet pipe from the detention pond is sized for a specific release rate of the 5 -year historic flow with the use of a restnctor plate. Erosion control devices will be provided at all culvert and swale outlets to protect against downstream erosion. Culvert sizes were determined using Hydraflow Express software Pipe sizing calculations were determined using Hydraflow Express software, The hydraulic calculations for Pipe and Culvert Sizing are included in this report in Appendix F. Drainage Channel Sizing: Irrigation ditch, diversion ditch, or swale capacities have been evaluated using Manning's Equation The channels are sized to convey the 5 -year storm event runoff flows. They were checked to ensure that their capacities are capable of conveying the 100 -year storm event runoff. The channel capacities were calculated using Hydraflow Express software. The hydraulic calculations for the Drainage Channels are included with this report in Appendix F. Detention Pond Sizing: The detention pond volume has been determined using the UDFCD's Detention Design — UD-Detention v2.34 spreadsheet. Detention Ponds A and B are sized to detain the 100 -year developed storm event runoff from the site's drainage basins (refer to the drainage basin plans in the appendix). The detention ponds will be configured to release no more than the 10 -year historic flow at the points of analysis in accordance with Weld County criteria A minimum of one foot of freeboard will be provided for the detention pond. The required water quality capture volume will be contained within the detention volume for the detention pond. An emergency spillway, in the form of a concrete weir and armored slope, is proposed to convey the 100 -year flow rate under a plugged orifice condition with a maximum water depth of 6 inches. Detailed detention pond calculations have been provided in Appendix G. Water Quality Pond Sizing: Water quality ponds are required prior to releasing stormwater runoff from the November 12, 2019 1 3 Fox Creek 26 SW Compressor Site Drainage Report development. The ponds will include a water quality orifice plate on the outlet structure in accordance with the Urban Storm Drainage Criteria Manual. The volume added to the detention pond to account for water quality was determined following UDFCD's Detention Design - UD Detention v2.34 spreadsheet. Detailed water quality pond sizing information is presented in Appendix G. V. DRAINAGE FACILITY DESIGN A. ON -SITE DRAINAGE - WESTERN PAD AREA The compressor facility stormwater management will include the construction of a detention pond, which will collect the runoff from the two on -site basins. Drainage Basin A includes the northwest portion of the compressor site. The runoff from Basin A is collected into Pad Ditch -1, which runs along the edge of the facility and then discharges into the detention pond. Basin B includes the southeastern portion of the facility, the topsoil pile and the detention pond. Pad Ditch -2, which runs along the eastern and southern edges of the site. will collect stormwater runoff and then discharge it into the detention pond. Table 2 — On -site Drainage Basins Runoff Flows Basin ID Basin Size (Ac) Peak Flow 5-Yr (cfs) Peak How 100-Nr (cfs Design Point A 2.00 1.2 4.2 2 B l 5.14 2.9 10.8 3 The 5 -year runoff flows were used to calculate the catchment ditch depths to convey the runoff to the Detention Pond. B. WATER QUALITY AND DETENTION The proposed water quality feature for the site is a water quality capture pond. The water quality for the detention pond was sized in accordance with the Urban Storm Drainage Criteria Manual, Volume 1, 2. and 3. The water quality feature is designed to handle the runoff from the developed portions of the site. Developed runoff flows are designed to route through the water quality feature. Per Urban Storm Drainage standards, 120% of the water quality volume will be provided. The proposed water quality volume drain time is 40 hours. An orifice plate is proposed as the water quality feature affixed to the pond s outlet structure. The WQCV is included in the detention pond volume for the drainage basins. WQCV calculations are presented in Appendix G. A storage volume summary is provided in the table below. As mentioned previously, there is a detention pond designed to collect runoff from the developed site The detention ponds collects the runoff and discharges to the outfall point at a rate that does not exceed the 10 - year historic runoff rate. The following tables presents a summary of the Detention Pond sizing. November 12, 2U 1 9 4 Fox Creek 26 SW Compressor Site Drainage Report Table 4 - Detention Pond Summary Detention Pond Calculations Drainage Area (acres) % Impervious of Drainage Area Time of Concentration (minutes) Water Quality Capture Volume (ac -ft) Total Storage (ac -ft) 7.14 34.15 18 0.11 0.53 Additional detention pond calculations, including WQCV orifice plate design. outlet pipe restrictor plate design, and emergency spillway design! are included in Appendix H of this report. C. CONVEYANCE CALCULATIONS (HYDROLOGIC CAPACITIES) The conveyances will consist of pad ditches that will collect the runoff from the pad slopes tributary to the ditch. These pad ditches will convey the runoff around the edges of the pad (perimeter) and discharge into detention pond before they outfall to the historic drainage The hydraulic calculations for the ditch and culvert conveyances are included with this technical letter in Appendix G. The geometric and hydraulic details are shown in the table below. Table 3 - Conveyance Geometric and Hydraulic Details Convet?ance Geometric Details 11 in. Slope (%1 5-Yr Peak Runoff Flow (cfs) Depth at Design Flow (ft) Pad Ditch - 1 3:1 V -Ditch 12"D Min. 0.25% 1 1.2 0.5 Pad Ditch - 2 3:1 V -Ditch 12"D Min. 0.25% 2.9 0.7 Off site Ditch - 1 3:1 V -Ditch 12"D Min. J 0.5% 5.0 0.8 Culvert - 1 18"CMP 0.5% 5.0 1.2 Culvert - 2 18" CMP 0.5% I 5.0 1.2 The culvert outlets will be armored with a rip rap apron to dissipate energy and reduce erosion at the outfall locations. Based on the flow and velocities from the culverts and diversion ditches, the rip -rap will consist of a Type VL rip -rap (D5o — 6"). The aprons will be 6 feet wide (or to a horizontal plane at 1' depth) by 6 feet long by 12" thick. The rip -rap aprons were sized according to the Section 8.1.1 of the Urban Storm Drainage Criteria Manual. Volume 1 method. Refer to the Drainage Plans in Appendix C for apron locations. VI. CONCLUSION This report was prepared in compliance with the Weld County Code and the Weld County Storm Drainage Criteria Addendum to the Urban Storm Drainage Criteria Manual Volumes, 1, 2. and 3. The proposed drainage system for the improvements to the Fox Creek 26 SW Compressor site will provide detention for the areas section of the site, releasing flows at the 10 -year historic rate. Releases are as near to the points of design as practical and are not expected to increase or cause adverse impacts on downstream property owners. This Drainage Report is being submitted to Weld County for review and approval. November 12, 2019 5 Fox Creek 26 SW Compressor Site Drainage Report VII. APPENDIX APPENDIX A - VICINITY MAP ti ovember 1 ?, 2019 V 22 23 I 24 R 63 W 54 PROPOSED ACCESS 393' +/- EXISTING PIPELINE 25 27 26 / 25 � / (0.8 M I . +/-) . CO ROAD 136.5 r O ,---, + \PROPOSED EXISTING PIPELINES (2)j p 2 LOCATION: FOX Ix in EXISTING PIPELINES (2)1 O a CREEK 26 SW PRODUCTION \ SHARON A. & JOHN L. PETERS- K O � 4.5 MI. +1-) HEREFORD \ C.---\) so— / 36 35 34/ s'0)'1 s400 �-� _ r T 12 N ) . �; r ITliN] -f =4,, J.N., i 2 ______ 3 1 I REV: I I0-2__-1 9 J.l'. ( RFMOVF ACCESS ROAD NOTE: PARCEL DATA SHOWN HAS BEEN OBTAINED FROM VARIOUS SOURCES AND SHOULD BE USED FOR MAPPING, GRAPHIC AND PLANNING PURPOSES ONLY. NO WARRANTY IS MADE BY UINTAH ENGINEERING AND LAND SURVEYING (UELS) FOR ACCURACY OF THE PARCEL DATA. LEGEND: HIGHPOINT OPERATING CORPORATION N EXISTING ROAD - - PROPOSED ROAD FOX CREEK 26 SW PRODUCTION FACILITY PAD - EXISTING PIPELINE NW 1/4 SW 1/4, WELD SECTION 26, T12N, R63W, COUNTY, COLORADO 6th P.M. ,fik UELS, LLC SL RVEYED WV J.B. 08-17-18 SCALE Corporate Office * 85 South 200 East DRAWN B\ L.K. 09-11-18 1 : 24 000 V' N Vernal, UT 84078 * (435) 789-1017 ACCESS ROAD MAP TOPO B ENGINEERING 8 LAND SURVEYING Fox Creek 26 SW Compressor Site Drainage Report APPENDIX B - DRAINAGE BASIN PLANS 1. Off -Site Drainage Plan — D-1 2. On -site Drainage Plan — D-2 November 12, 2019 I T112N R63W) i 27N:\__,,, 0 Proposed Fox Creek 26 SW Compressor Site cL----_-c-___;_n IT MIN. SWALE DEPTH (MIN.) TYPICAL PAD DITCH TYPICAL OFF -SITE DIVERSION DITCH LEGEND: IYMP,NINO • I ANn SURW Wln me DIRECTION OF FLOW ARROW 4 OUTFLOW — — a DRAINAGE BASIN BOUNDARY UELS, LLC Corporate Office • 85 South 200 East Venal, UT 84070 • (435) T09-1017 SYMBOL LEGEND DESIGN POINT DRAINAGE BASIN DESIGNATION 5-YR WEIGHTED RUNOFF COEFFICIENT DRAINAGE BASIN AREA (ACRES) SUMMARY RUNOFF TABLE DESIGN POINT RUNOFF 5-YR («s) PEAK 100-YR () IIIGHPOINT OPERATING CORPORATION FOX CREEK 26 SW COMPRESSOR 26, TI2N, R63W, 6TH P.M. WELD COUNTY, COLORADO DRAWN BY: S.G.T SCAT E I" = 75(7 DATE DRAWN I -I2-2019 REVISED OFF -SITE DRAINAGE: PLAN QI • • • • • • • • • • • • • ♦ • • ♦♦ II ♦♦ - —II - -II--II-- ♦ - ♦ t a kis SOS 53, JOS 3435 50O9 5433 Sel Det 'Gai Pond Retained Vat 23.110 CF Btrn Dims: 45' r 140' BM 8 5429.7 Crest 8 5434.0' Splway 8 5433.0' I I II — 11 • • I1 —III'-11� `Easing oitd, -11-- -11 —II 1 11— —II— —II— —II— —II— Culvert-1 It Dia r 6P CMP 05% an Slope OFFSITE DITCH -1 DEPTH - 12' MN. II II— —II— —II— —II- 3'I SIDE SLOPES. SLOPE MIN. 0.5% - 5YearFlan-5.0CFS II- -II— —II— -II I l PAD DITCH -1 DEPTH - 12• IAN. 31 SIDE SLOPES. SLOPE MN. 0.25% V -DITCH 5 Year Roo -12 CFS A 2.00 INV-54 0.29 r 0• C C Ci a>• Proposed Fox Creek 26 SW Compressor Sale -11- ti II - - II- -II- - -II .4, U • 5439 II I I r 11 B 5,14027 sQ,fc,1/4b'r4,4,� s `% it 11 —11 4 •1• sea 49 I I A 11 At OO OO I1 1 3436 yh NV.544022 —II— QMs1-2 �18'Dia:47CW —0.5% Alit Skye I — - PAD DITCH -2 DEPTH - 17 MIDI 31 SIDE SLOPES. SLOPE MIN. 0.25% V -DITCH — 11 — 5Year Flow - 2.9 CFS X A SYMBOL LEGEND SUMMARY RUNOFF TABLE A DESIGN POINT DRAINAGE BASIN DESIGNATION 5-YR WEIGHTED RUNOFF COEFFICIENT DRAINAGE BASIN AREA (ACRES) DESIGN POINT BASIN AREA (Ac) RUNOFF 5-YR («s) PEAK 100-YR Ws) 1 119.32 5.0 1.2 29 46.5 4.2 10.8 LEGEND: ty DIRECTION OF FLOW ARROW RD OUTFLOW DRAINAGE BASIN BOUNDARY F NC:INFFRINCI • l ANO Sure UELS, LLC Corporate Office • 85 South 200 East Vernal, LT 84078 • (435) 789-1017 2 3 2.00 5.14 HIGHPOINT OPERATING CORPORATION FOX CREEK 26 SW COMPRESSOR 26. TI2N, R63W, 6TH P.M. WELD COUNTY, COLORADO DRAWN BY: S.G.T. DATE DRAWN. 11-12-2019 SCALE I- = 100' REVISED: ON -SITE DRAINAGE PLAN U- 2 Fox Creek 26 SW Compressor Site Drainage Report APPENDIX C - FLOOD PLAIN MAP - FIRM MAP PANEL November 12, 2019 NOTES TO USERS IM ••ePr ' . e„-* vas= LEGEND PffSll IIN0O1rY1.•Ilb NW IY.M.19Y11 IN OM • Y h M 44 UMW a yr N twin rler.r.rrrl'• awe Ii.M•.Y 11....a•wrNr w ems / dine M1 •.e w�•..w.•www•r w•w rlr• asM l• rP•gila 1. rY Are r/ ti./Y.•LM 'sari.. It r•• CI r.#.014 rlam .«u rstr.w.o. w• .s . I. no . .r'_•ws. w. 'SO fora .'air • e.. w._ air s Y %.sarn W W SWF.. _S law rr• array MOM at sea •a re .rawer was ••.wr1 .r•ae r a.e.era r . .. r •r•.• `Art re -1 '.Irw1 "`T I'Y AM !,•w WWI (•0 ` V)* ... ' " M Af• elan. gist ♦•<CC ♦ - _ f • - - _"y-. • - .• I � w ; _ .. • ..♦ j'� r "•1/ ^ yV - - �' .J °,f. • • 4 i nrom sirs•• Wes r Wwl was wart.+.• sew ••w.••. W IY•/Owr•w M• sr:sew aw . wIMO OM r. .r•wwePrerrw rarer.r.a ASV •••/••e. O sY •••• •••• ••••••.. M •.'/ 4 •.• IS 010141 f• 1 ••••••«1 r Y •r r•Y Y••Pr.. MOOS OY eras twee a YAW t Sea es 01•1•0101( re N rlor W*wr Y.r. / la' 111N•1 N r•••1.r•. 01.1 Y.11 .we On w OW ~dm) rtl•4M •Y. » N .0. ..g rr r...•a:�. \. .I - - _ ... + t' _ t • - • ^ <. . \1 rlrlln.nr. �\ • • \\\., ! ••• ` �‘r r'' • . . S •�� J .^-> ow swum I .r awn nos awe. M ~MI r gill �ww/.r)r•'e�•l.ar•. rr awr..)rI'.. r.r.ww...r Irel rl.•r.•».rr•rrlr•arw w_. �•IYI'a• r/OI.•1 r•. •• N✓w•m •d awe ~Wit'11O,I MO sod girl.•.11•n.em .ela • r nl nuns Was r NNW w w/• S.. w• MO Air a aw..•n was sneer sea•••••• •�« 1d ,. .f/ 1 14-x_ I r«.gnipi..1•i Ilfr\ pr ;II. `\\ , 1 / :..__. . I Jul i1'�. R 1 ••r/Yu.lt W r •••• r•IS COMPS Yr• sew arrM111r .•.r on a..01 a ..I 011••.1 Wile '••s use y w film am •••••• 4w inns swat 0•••••• .e •W "YM an I . 4 r.. MIS err. 1. N gist w ►rw7I YM as •••••• /••Yw.4. see sm. .yn•✓.w._r gin i •r I !r , • !" 11 S r •• - - • _ " • .. • • Y - •, ____-1- - • �- _ • 16 .w " ! 1• \" V . (:1.. 1 I 'arse ass n ar.....••r ru y�SOO.*r easels a• Ili r.•aya w..e..rw.rr•..rlr:.r.w.. rare ICI mwo w M - sari•/ .. . te•Pr• . r new •1a. 11.•r r w - Lase r ti.•r al•- wins'tl.elriNIa e..re4.41 r e••. •r r r ma. ••••• r• e• •'rte rrrarn..r ~MI MINIM ".______• w• M a w•e M Oa I.wrr•• a —. apses ....my. e•.•rr.Ib Warr I r 401'.•0101 • r•r•Ir ern rr...w.r 1�I........, r... •err iii FS N•M u oar m _Yarn• r F•. seam or wl.�••rwoo . se •••• • •••••••• Maer. er Wee 'ft Wenn WI %Woe SP, ass saw we a rinse. 'rata• r nrlrwl 5 1. Psalms •w mounds nuns •rlrw rani -U••. Nflea amnia boar ••••••• _ rYMwave, ••r w nee• I. In Y•Mpllrl 4s/ �,• _• �1 FOX CREEK 26 SW ONO _.•.••a..w••n.e s•••••00a noel•w.•I.I..•sr_ r •r. -Or'''. . •• I r -. • - a ' r.i .� 1 1�< -- • • t - \ •yyn;•- Cr.' es se n %ea0Iww.101M Use .•. •• parse ere saws Lagers' *Win Ws. 3••Va0•rrw Yew' rear me le... 1®M 1 con I WOMAS a Is Wades ••r r•Ir.rl a WSMw.rw.'cones Ti. 'T✓. 011 ..�/\A.•. /.••W sew/1. •... wee gill' �I�rw.s r.a.wrIsewarer}• r w - • .• -1- ( 11 - /girl n w fl —. • M MI WS Lamina III... q{LY) w. I) I» I.erleer Y... MD W C.0. Ii in...l Irn___r• N. I inN ay n•M 1 _ - -•l - ♦ I• -.. • ..- . - •• ' S I .Ii ._ ". 7. .. y.^� i. - • A' 1 �� -1 - v • - •'1 • , - t • �' _ - 1 /4s••••••••••••••••••••• s•. rnw. UN* ••••• ins . II•. sear > IRY• b SOW WOW. •w .N. • Or rows /r _r•_Yb••—_____•W.irr 1W New. .••• ••n .rY. a•w.••H eve Wing rarer• ate+• Wane marl eV ••• IOW .See Pl.r.1•.Yr•r•M•w..IrrNww'•rwa.'wnaltwr ••e• nee W •er••.• ti r e•••+• Y Wiles s N earl r• r.... r,...r..rr.rrr MI N WSW I•wYva 400111.11,400111.11,WIN (USN ITS WU as w 14••••14r w We .was .lane. r••••••••sass r•rn w NOW Cass same Oen • l» was N •.N nt.'s - - - _ _ h,01.P - • 1. r .. 1' - r. _ J _ WNW Bien r • Sr l0.10.31Q•elr Own .r see.*. 1illiI•QdJ•a/I - .•w.rw"MOO flee. r.nrN Ww• iO.rw(i•w.wre./NS •• *AM •r••..r.s Sew.i M101.r►N.N. 1n.r.I na •sire• •••• el Memo* r- •..Ia • realls WOOS 9. rats.... ... -•_�'+ "' *MI 016 Vas e1K ••L•M •••••""•••'141' . y r - 2 .-•' • —_— +r.w.1•r. b••IP1 Nsr )M r• NO 1..: eleu l• %eler erne.. b/r•..n ass .. . - - - - - _ - '. ._- f • .. ) . - • - • .: C • '^1 ). ' a , �_' I••.endsaw•'w.rrnrrlrr. rrwY..e.. afaa5, uti/�. w`"rsoft• nos sus ..... w..-•. r•e•rr. ••••• se w01•aw• as Om ••• ••err r..'elm rear. r.. m Was SU OM Ammo- soya Sys • tee rumen w •.w vat» •Isar. era+ r. www.. Mn.Y•0 O. laws •Iw•r sea ~OS (aims 'hies. a INll ell Wl r w rwoo . 1r1fmANIY4•• •r NW i•.l••q YV•• w orgyn • • tr•I.r• . •ese•••.- 0040•40040•4101•0040•410 webs ails wanes Ins. M* in-, its. PO) O Q tonsw sand r raw rrrr sins sat M 01stw•r•s r•.Na•r 'myna ••••••• • NIP 4. 4.•••:re ea N sari.•••I seta Mir r .ate wtV••• Oft WU •••••••w• as as awn,♦.+e.• v N law C •I war 8 -._ r a71a•�v .earl». •r..r New IM—•Ws ass Weed . ,M••• ewe '54— frsyll•. r..•e•.• , wens rins• Ds sae us• ion n }I -�-« • 4 _ - 1. ,1. 4 N' .` ,. .IN 1... r."". '•Y • , - - R I -4..w. M •w •••••••• N•row 1111.1 bas wines t "saw011 s)Y Aerie Cm I IP Y • .•.w 1.•••••• •ess we ea err) N •w Nabs.. Ms w Mars 1 rN rue us m• •••••=1 seas ar ...not www r a• an.Iw•4 w... • I••• es aural '.leas. .• ••• N a✓• 1 •sari •••, • wl•w•r•1f1 .a.• New•••• r. OMP Ma 1..arcs__ le 004414•1101 nIIEI•larUfl 4 1M M r ew MaeaM •nl••If4VO.w 10 ••' .or. •..01••4 in se. .law Ma• w 1._•._ Vrw• . v r• w rarer .••• •••bw /• awe • slang miss r Ns .. snow a•••••Wa• 102•We s •,a Sue • Ws I .. _ 3 : / I '1 Ia _ 1 - .a/ .'liar 1 :" j'1'RI r• •.li . • ,'fi J�. /1NMI I I f. .!•l` M I. Kist 1 tt '1 i1 . ' -1" 1 1 I L- 6 Ie®rl en le.te.r rN/1 dews er.r.Worn r rnap C.•a•t gI11•a.w•r w.1•sew►New rear••'IN.•rs r wads. be <nn•M• r r ewer* w sw.w. new ». O•Ir WI e• •r •w1 rare • rY 1•rr1 n••.rrr w•ell.•I row, ware l .we two snores Ise rate• Are wooer w ISO Ise•• r r N •.•real ••••1 • sass...• ..sari rwY /n lrY a PIS r..•••• owes Wow f •.. • -� or•. M «air VW Paw. •1r�11 •sire • •• .- - + 11 I I -' 1, III 411 r. - .. u- I `• .1... I'- jV I1 I _� •. _'-. .' r� -_ t j ~l2 S_ 1: - CT i• .. I% • NOON 122 ..,•,.....„.... e•.•I•a a Ss •• r•a.•.I•r a soli,Sr a rlrr.••Y_ 014 sear. aria.•. L owe smut sews OS r ea• •r N was _vw• cwe .KI .e•• • Ire Send war r a+• gamma r.w.—.w_ ••• go... w•••.••• r. l• ••••••a• a ax wadspw•Yua rem La . s ISO is • Neislaw fr• l•••••I I MO. N --..r NOV Ore m r 1•20• O PISA unloosed a 0 4tiat. • w 'wars a'ee. s1 •M we r w r I'•••en a w wise rest a N •rap vM•) IBA OM, I? eU.q• VYse a • w Ware Mn *Alenpl r .• N I•W ¶ in. i ia^ • u . - •. 4 !1 •I,..� sew issmilmi Mtn •• • • r r .- Ii dr Patin o•ooe -sew •r *1st „Ise I 1 �.'.- ,7' 010 _ •� la, .- � !�•' ,�. .•. MINIM0 ! PIP •i W ++yam� AIL ca r m FIRM I FLOOD INSURANCE RATE MAP NF:1.1)((n,NT1. ( DI.OR4UU AND IS( IMNM)N 1111) �Ni \y a••0•>r7/• •la !.MiwSW ..IVw lrlww.wrtr ; GVFra seeE/Yi WOW is. wry r .r... Pao was .w. w .0•••••••44 114•41•1 SPY 4•1•. rrarY P -w� •"'t I .. -! ..- _ ........a .--riVir - 'M/fl J , N 0141/ l`•5 1 na.allnrlbd.\rel. Ilau:66 „- a' '• - -4 a._ "' L l ' - - ^, 'Ie-•• .q _ - 1• .-,. _+. _. •- -_ i Ala N. •^lp,n _ — _- n AK W 1 - --1,11 • "] 3 I ••is ••• g.' 7-' .) x -rW .• a - .. ..• ,.'�, w w -� -_ e -4 .Y • llt«., b 11 t V. 11�\ 4 • .� li,e.;� • I i \\ " Tat Lat.] - •� a I i. } i A :II `-i.l—:__ 1 - :t - . )/ e• w — _.�. 1 - ' ,. •" - +. -.,•f�` - . :�I . I - IN II •• Si A - w . .rwra.+ r w .real I .I ' • I. ..✓was 01)lJCOd00E �,}'MAP NUMBER C 4144., EFFECTIVE DATE JA% • u$ l0,1016 It I s.q..n et.rrne... e.._.. - .a .•• :. qIOg u v ... ..•01 Ft NNW r. .. ... ... •a. Fox Creek 26 SW Compressor Site Drainage Report APPENDIX D - HYDROLOGIC SOIL GROUP November 12, 2019 13 40° 58' 49" N 40° 58' 39' N 104° 24 34' W 546670 A N S N p 549723 54971 Hydrologic Soil Group —Weld County, Colorado, Northern Part Map Scale: 1:2,130 if punted on A landscape (11" x 8.5") sheet. 30 60 120 Meters 180 A Feet /V 0 100 200 400 6000 Map pro}ectan: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 USDA Natural Resources a Conservation Service Web Soil Survey National Cooperative Soil Survey X 560120 40° 58'49"N I I I 560020 560070 59012) rn N 8 10/29/2019 Page 1 of 4 40° 58 W N Hydrologic Soil Group —Weld County, Colorado. Northern Part MAP LEGEND MAP INFORMATION Area of Interest (AOl) Area of Interest (AO() Soils Soil Rating Polygons • A A/D B B/D C f-1 C/D MI D Not rated or not available Soil Rating Lines . ♦ A r:r A/D ti. B .ti,i B/D . r C C/D .tie D • , Not rated or not available Soil Rating Points A ® ND ■ B B/D O • s 0 C The soil surveys that comprise your AOI were mapped at 1:24,000. C/D D Not rated or not available Water Features Streams and Canals Transportation to Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography Warning Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area- Weld County, Colorado. Northern Part Survey Area Data: Version 14. Sep 13, 2019 Soil map units are labeled (as space allows) for map scales 1 50,000 or larger. Date(s) aerial images were photographed: Oct 22, 2014 —Oct 2, 2017 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. usim Natural Resources Web Soil Survey al Conservation Service National Cooperative Soil Survey 10/29/2019 Page 2 of 4 Hydrologic Soil Group —Weld County. Colorado, Northern Part Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 4 j Ascalon fine sandy loam. 0 to 6 percent slopes B 15.8 99.2% 51 Peetz gravelly sandy loam. 5 to 20 percent slopes A 0.1 0 8% Totals for Area of Interest 15.9 100.0% 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 (AID 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 Conservation Service National Cooperative Soil Survey 10/29/2019 Page 3 of 4 Hydrologic Soil Group —Weld County, Colorado, Northern Part Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie -break Rule: Higher USDA Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/29/2019 Page 4 of 4 Fox Creek 26 SW Compressor Site Drainage Report APPENDIX E - NOAA ATLAS 14 - PRECIPITATION VALUES November 12, 2019 1$ 5/15/2019 Precipitation Frequency Data Server NOAA Atlas 14, Volume 8, Version 2 Location name: Grover, Colorado, USA* Latitude: 40.9724°, Longitude: -104.4466° Elevation: 5477.63 ft** • source: ESRI Maps " source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Cad Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration 1 2 5 10 25 50 100 200 500 1000 5 -min 0.256 (0.198-0.333) 0.307 (0.237-0.399) 0.398 (0.307-0.520) 0.482 (0.369-0.631) 0.608 (0.455-0.835) 0.714 (0.521-0.990) 0.828 (0.584-1.17) 0.951 (0.645-1.38) 1.13 (0.735-1.68) 1.27 (0.804-1.91) 10 -min 0.375 (0.290-0.487) 0.450 (0.347-0.585) 0.583 (0.449-0.761) 0.706 (0.540-0.924) 0.890 (0.667-1.22) 1.05 (0.763-1.45) 1.21 (0.855-1.72) 1.39 (0.944-2.03) 1.65 (1.08-2.46) 1.86 (1.18-2.79) 15 -min 0.457 (0.353-0.594) 0.548 J(0.423-0.713) 0.711 (0.547-0.928) 0.860 (0.658-1.13) 1.09 (0.813-1.49) 1.27 (0.930-1.77) 1.48 (1.04-2.10) 1.70 (1.15-2.47) 2.01 (1.31-3.00) 2.27 (1.44-3.40) 30 -min 0.605 (0.468-0.786) 0.727 (0.562-0.946) 0.945 (0.727-1.23) 1.14 (0.874-1.50) 1.44 (1.08-1.97) 1.68 (1.23-2.33) 1.95 (1.37-2.76) 2.23 (1.51-3.24) 2.63 (1.72-3.92) 2.96 (1.87-4.44) 60 -min 0.730 (0.564-0.949) 0.892 (0.689-1.16) 1.18 (0.906-1.54) 1.43 (1.10-1.88) 1.82 (1.36-2.49) 2.13 (1.56-2.95) 2.47 (1.74-3.50) 2.83 (1.92-4.12) 3.35 (2.18-4.98) 3.76 (2.38-5.64) 2 -hr 0.855 (0.669-1.10) 1.06 (0.826-1.36) 1.41 (1.10-1.82) 1.73 (1.34-2.23) 2.20 (1.66-2.97) 2.58 (1.90-3.53) 3.00 (2.13-4.19) 3.44 (2.354.92) 4.06 (2.67-5.96) 4.55 (2.92-6.74) 3 -hr 0.922 (0.726-1.18) 1.15 (0.902-1.46) 1.54 (1.21-1.97) 1.89 (1.48-2.43) 2.42 (1.84-3.25) 2.85 (2.11-3.86) 3.31 (2.374.58) 3.80 (2.62-5.40) 4.49 (2.98-6.54) 5.04 (3.25-7.40) 6 -hr 1.08 (0.857-1.35) 1.32 (1.05.1.66) 1.75 (1.39-2.21) 2.13 (1.68-2.70) 2.71 (2.09-3.60) 3.19 (2.40-4.28) 3.71 (2.69-5.08) 4.26 (2.97-5.98) 5.04 (3.39-7.25) 5.67 (3.70-8.21) 12 -hr 1.28 (1.03-1.59) 1.52 (1.23-1.89) 1.95 (1.57-2.43) 2.33 (1.87-2.92) 2.91 (2.28-3.82) 3.40 (2.59-4.49) 3.92 (2.88-5.29) 4.47 (3.16-6.19) 5.26 (3.58-7.46) 1 5.90 (3.89-8.42) 24 -hr 1.51 (1.23-1.85) 1.75 (1.43-2.15) 2.18 (1.77-2.68) 2.57 (2.08-3.17) 3.15 (2.494.07) 3.65 (2.81.4.75) 4.17 (3.11-5.56) 4.75 (3.39-6.47) 5.56 (3.82-7.76) 6.21 (4.15-8.74) 2 -day 1.71 (1.42-2.07) 2.01 (1.66-2.43) 2.51 (2.07-3.06) 2.96 (2.42-3.61) 3.59 (2.864.55) 4.11 (3.20-5.26) 4.65 (3.49-6.08) 5.21 (3.76-6.98) 6.00 (4.16-8.23) 6.61 (4.47-9.17) 3 -day 1.89 (1.58-2.28) 2.20 (1.84-2.65) 2.73 (2.27-3.29) 3.18 (2.63-3.86) 3.83 (3.07-4.80) 4.36 (3.41-5.52) 4.90 (3.71-6.34) 5.47 (3.97-7.25) 6.24 (4.37-8.49) 6.85 (4.66-9.42) 4 -day 2.05 (1.72-2.45) 2.36 (1.98-2.83) 2.89 (2.42-3.47) 3.35 (2.78-4.04) 4.01 (3.23-4.99) 4.53 (3.57-5.71) 5.08 (3.86-6.53) 5.64 (4.12-7.44) 6.42 (4.51-8.67) 7.03 (4.81-9.60) 7 -day 2.39 (2.03-2.83) 2.73 (2.32-3.24) 3.30 (2.79-3.92) 3.78 (3.18-4.51) 4.46 (3.63-5.48) 5.00 (3.97-6.21) 5.54 (4.26-7.04) 6.11 (4.50-7.94) 6.87 (4.88-9.16) 7.47 (5.16-10.1) 10 -day 2.68 (2.29-3.16) 3.06 (2.60-3.60) 3.67 (3.12-4.33) 4.18 (3.53-4.95) 4.89 (4.00-5.95) 5.45 j (4.35-6.71) 6.01 (4.64-7.56) 6.58 (4.88-8.48) 7.34 (5.24-9.70) 7.93 (5.51-10.6) 20 -day 3.51 (3.04.4.08) 3.99 (3.454.63) 4.76 (4.09-5.53) 5.38 (4.61-6.28) 6.22 (5.14-7.43) 6.86 (5.54-8.30) 7.48 (5.84-9.24) 8.10 (6.07-10.2) 8.90 (6.42-11.5) 9.49 (6.68-12.5) 30 -day 4.22 (3.684.85) 4.79 (4.17-5.51) 5.69 (4.94-6.57) 6.41 (5.53-7.43) 7.36 (6.12-8.70) 8.06 (6.56-9.65) 8.74 (6.87-10.7) 9.39 (7.08-11.8) 10.2 (7.41-13.1) 10.8 (7.66-14.1) II L45 -day l 5.12 (4.50-5.85) 5.81 (5.10.6.64) 6.89 (6.03-7.89) 7.73 (6.73-8.89) 8.82 (7.37-10.3) r 9.60 I (7.85-11.4) 10.3 (8.17-12.5) 11.0 (8.35-13.6) 11.8 (8.64-15.0) 12.4 (8.85-16.1) 60 -day 5.91 (5.22-6.71) I 6.70 (5.92-7.62) 7.93 (6.97-9.03) 8.87 (7.76-10.1) 10.1 (8.44-11.7) 10.9 (8.96-12.8) 11.7 (9.27-14.0) 12.4 (9.42-15.2) 13.2 (9.65-16.6) 13.7 (9.83-17.6) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAH Atlas 14 document for more information. _ Back to Top https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=40.9724&Ion=-104.4466&data=depth&units=english&series=pds 1/4 Fox Creek 26 SW Compressor Site Drainage Report APPENDIX F - RATIONAL METHOD RUNOFF CALCULATIONS 1. Drainage Basin Runoff Calculations November 12, 2019 UINTAH Weld County l{ng neenng h ('onstrvcttan Cnuna Table 3-3 Recommended Percentage Imperviousness Values L'UhI'lJ Vol 1 - table 6-3 Rr. o n)nrnded Pemnsage lmtpernonwn Values Impervious WEIGHTED IMPERVIOUS SURFACE CALCULATIONS Undeveloped Areas Historic Flow Analysis 2% Greenbelts, Agricultural 2% Off -site flow analysis (Land Use Not Defined) 45% Streets Paved Gravel Recycled Asphalts 100% 40% 75% Developed Areas Concrete Driveways 90% Sidewalks 90% Roofs 90° %I IS('. Single -Family Res. 0.75-2.5 Acres 20"/ Parks Pond Area 0 Berms/ Cut/Fill Slopes/ Landscaping 10 11/13/2019 Basin Area (Ac) Area (Ac) ♦ Area (Ac) Area (Ac) Area (Ac) r Area (Ac) Area (Ac) Area (Ac) Area (Ac) Area (Ac) Area (Ac) Area (Ac) Area (Ac) Total Area (Ac) Percent Ira pen. OS- I 119 32 I I 9 32 2.00% :1 1 91 0.09 _' 00 38 29% 13 3 73 n 2(, 1.15 5 14 34 53% 0 00 0.00% 0 00 0.00% u OD 0.00% 0 00 0.00% 0.00 0.00% 0.00 0.00% 0.00 0.00% 0.00 0.00% 0.00 0 00% 0.00 0 00% (10(1 0 00% I 0(.0 I .'.(, -Ih USDCM Vol 1 - Section 6 0 Runoff Page I U I NTAH WEIGHTED RUNOFF COEFFICIENT VERSUS WATERSHED IMPERVIOUSNESS METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO) CA=KA+(1.31i3- 1.4412+ 1.1351 - 0.12) for CA > or = 0, otherwise CA=0 CB = (CA + CCDY2 Co) = Km + (0.8581 3 - 0.786:2 + 0.774, + 0.04) : = % imperviousness/100 expressed as a decimal KA = Correction factor for Typc A soils Ka) = Correction factor for Type C and Type D soils (RO-6) (RO-7) Soil Type A Correction Factors, KA & Ken Storm Return Period 2 -Year 5 -Year 10-Yr 100 -Year 0.00 -0.08, • 0.09 -0.14/ r 0.17 -0.25: , 0.32 CorD 0.00 -0.10, + 0.11 -0.181 + 0.21 -0.39: + 0.46 11'1 ; '019 Basin ID % Imperv. i Soil Type Correction Factors, KA & Ka) Runoff Coefficients, C Basin Area Total Area (Ac) Weighted Runoff Coefficients, C r soil I 'I,e 5 -Year 10 -Year 100 -Year 2 -Year 5 -Year 10 -Year 100 -Year (Ac) 2 -Year 5 -Year 10 -Year 100 -Year fl °„ A 0.09 0 1 r 0.12 0.00 0.00 0.07 0.22 0.00 OS -1 2.00% 0.02 B - - - 0.03 0.08 0.17 0.36 119.32 119.32 0.03 0.08 0.17 U 36 CorD 0 II 0.21 0.35 0.06 0.16 0.26 0.51 000 A 0 06 0 12 0 27 0.18 0.24 0 29 0.40 0 00 A 38.29% 0.38 Il - - - 0 22 0.29 0 35 0 49 2 00 2.00 0.22 0.29 0 35 0 4') C or 1) 0.07 0.14 0 31 0.27 0.34 0 41 0 58 0.00 A 006 012 024 1).13 0727 0.28 0.39 0 O B 34.53% 0.35 B - - - 0.20 0.27 0.34 0.48 5 14 5.14 0.20 U 27 0 5•I 0 18 C or D 0.08 0.15 0.33 0.25 0.32 0.40 0 57 0.00 ► A 0.09 0.17 0.32 0.00 0.00 0.0! 0.20 0700 0 0.00% 0.00 B - - - 0.02 0.08 0.15 0.35 0.00 0.00 . CorD 0.11 0.21 046 0.04 0.15 0.25 0.50 0.00 k 0.09 0.17 0 32 0.05 0.05e 0.05 TM 0.00 0 0 00% 0.00 B - - - 0.05 0.10 0.15 0.35 0.00 0 00 C or D 0 II 0 21 0.6 0.04 0.15 0.25 0.50 0.00 .r.......b 017 012 i,ft b.00 (Sits 11716 00-0 0 000% 0.00 B - - . 0.02 0.08 0I5 0.35 000 0 0 C or D 0 11 0 21 0 •16 0.04 0.15 0 25 0 50 0 00 A 0 091 0 17 0 12 t t't 0 on 0 mi 0 7-0 0.00 0 0.00% 0.00 B - - - 002 00K 0V 0 ;5 000 000 CorD 011 021 016 001 015 025 050 0.00 A 009 017 03? 000 000 005 020 0.00 000°0 0.00 li - - 002 008 0 I S 0.35 0.00 n00 Corti U I I 021 0-16 004 015 0 2S 050 0.00 1di•. A 0 09 0 1? 0 +7 0 00 0 00 0.05 0 20 b.6b 0.00% 0.00 li - - - 002 008 0.15 035 0.00 000 C or I) 0 I 021 016 004 0 IS 025 050 000 100% A 0.(h) 0.17 0.32 000 0.00 005 020 0.00 0.00% 0.00 13 - - - 0 02 0 08 0 15 0.35 0.00 0 00 C or Q UII 0.21 0.46 0 04 0.15 0.25 0.50 0.00 100% A 009 0.17 132 O0 0.00 0.05 0.20 0.00 si 0.00% 0.00 B - - - 0.02 0.08 0.15 0.35 0.00 0 00 _ C or D DII 0.21 0.46 0.04 0.15 0.25 0.50 0.00 100% 0.00% 0.00 A B 0 00 - 0 17 - 032 - oto 0.00 0 02 0 08 003 0 1 5 0.20 0.35 0.00 0 00 0 0(I C or D 0_11 0.21 0.46 0.04 0 15 0 25 0.50 0 0(I 100% C 0.09 0.17 0 37 (00 0.00 0 05 0 20 0 W - 0.00% 0.00 B - - - 0 02 0.08 0 15 0 35 0 00 0 UU C or Q 0 1 I 0.21 0.16 0.04 0.15 0_25 O 50 0.00 ,n;. C 0.09 0 I 037 000 000 0.03 020 0(10 0.00% 0.00 B - - - 0 02 0 08 0.15 0 35 0.00 0 00 CorD 01I 0.21 046 004 0 15 0.25 050 0.00 USDCM Vol 1 - Section 6.0 Runoff Page 2 iffsk uIKTAH awn*.cr amn • taeo ntjavr v*40 STANDARD FORM SF -2 TIME OF CONCENTRATION METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO) NRCS Conveyance Factors, K I leavy Meadow 'I'il lagc/Field 2.50 Short Grass Pasture & Lawns 5.00 Nearly Bare Ground 7.00 Grassed Waterway 15.00 10.00 Paved Area & Shallow Gutter 20.00 Is the basin Urban or Non -Urban? Non-lirbaP' 11/13/2019 Design Point Sub -Basin Data Non -Urban - Eqn 6-3 Initial/Overland Time T(' ) Non -Urban - Eqn 6-4 Travel Time 1(t) Non -Urban Urbanized Basin T c) . Check Flo« Length (Overland) Drainage Basin Area (Ac) C(5) Length (ft) Slope (%) T(1) min Length (ft) Slope (%) Coefi (K) Velocity (fps) T(t) (min) Comp. T(c) Total Length Eqn 6-5 T(c) Final c) (min) I OS -1 I I 0 : ' 0.08 500 0.6 48.7 10225 00 u ;9 440.0 488.7 10725 194.0 OK 194.0 -1 ' ;II 0.29 9 0 3 6.5 t)39 10 nu 0 „ 28.6 35.1 948 25.7 25 7 OK i li , 14 0.27 4: 0 5 12.9 985 a 7, 0+ 0 71 23.2 I 36.1 1032 24.3 OK '4 , ., 0.00 ,00 1.0 100 1.0 I 400 OK OK OK OK OK OK OK OK OK OK OK Ho) r, 0.00 300 I.0 10' I.0 10 ,!! 400 10.0 0.00 300 1.0 100 1.0 10 00 400 10.0 s 0 00 100 1.0 100 1.0 , 50 400 10.0 , 0.00 300 1 0 IOU 1.0 10.00 400 10 0 iii 0.00 300 10 1110 1.0 1000 400 IU.0 IT 0.00 300 I0 100 10 I0.01 4Uu 10.0 12 0.00 300 I.0 IOU 1.0 10.00 400 10.0 13 0.00 300 1.0 100 1.0 10.00 400 10.0 14 0.00 30u 1 0 10u 1 U 10.00 400 10.0 15 0 00 300 100 10.00 400 10.0 USDCM Vol 1 - Section 6.0 Runoff Page 3 rk V I NTAH STANDARD FORM SF -3 5-1/11 RUNOFF - RATIONAL METHOD METHOD AS DETAILED IN URBAN STORM DRAINAGE CRI'T'ERIA MANUAL VOL. 1 (COLORADO) 5- Fr !lain/till Depth-l>unman-I•rcqucncy (l -hr/ 1.18 imhr 11/13/2019 Deign Storm: 5 Year BASIN INFORMATION DIRECT RUNOFF TOTAL RUNOFF Design Runoff T(c) I Q T(c) Sum I Q Point Drainage Basin Area (Ac) Coeff. (min) C x A (in/hr) (cfs) (min) C x A (in/hr) (cfs) R r\I A R K S 1 OS -1 119.32 0.08 194.0 9.73 0.51 3 A 2.00 0.29 25.7 0.58 2.02 4 13 5.14 0.27 24.3 I.39 2.09 5 0.00 6 0.00 7 0.00 e 8 0.00 9 0.00 10 0.00 II 0.00 ■ 12 0.00 13 0.00 1.1 0.00 I .R 0 00 .- f;Sl)CM Vol I - Section 6.0 Runoff Page 4 101%, uI N TA H -H,,N[6 notch a LAND MINVII VINO STANDARD FORM SF -3 100-YR RUNOFF - RATIONAL METHOD METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO) 100-Yr Rainfall Depth -Duration -Frequency (1 -hr) 2.47 inihr 11/13/2019 Design Storm: 100 Year BASIN INFORMATION I)IRECT RUNOFF TOTAL RUNOFF n Runoff T(c) I Q 'no Sum 1 Q 1'c i n t Drainage Basin Area (Ac) Cceff (min) C x A (in/hr) (cfs) !min) C x A (in/hr) (cfs) ?�i,1 R K S RFMARKS I OS -1 119.32 0.36 194.0 43.22 1.08 40 A 2.00 0.49 25.7 0.98 4.23 _ 4 I B 5.14 0.48 24.3 2.47 4.38 l ': 0.00 6 0.00 7 0.00 8 0.00 9 0.00 10 0.00 11 0.00 12 0.00 13 0.00 14 0.00 15 0.00 USDCM Vol 1 - Section 6.0 Runoff Fox Creek 26 SW Compressor Site Drainage Report APPENDIX G - CONVEYANCE CALCULATIONS November 12, 2019 Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk. Inc PAD DITCH 1 - 5 YEAR Triangular Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope (%) N -Value Calculations Compute by: Known Q (cfs) Elev (ft) 5445.00 5444 50 5444.00 5443.50 5443.00 5442.50 = 3.00. 3.00 = 1.00 = 5443.48 = 0.25 = 0.020 Known Q = 1.20 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth. Yc (ft) Top Width (ft) EGL (ft) Tuesday, Nov 12 2019 = 0.53 = 1.200 = 0.84 = 1.42 = 3.35 = 0.40 = 3.18 = 0.56 0 1 2 3 4 5 6 7 8 Depth (ft) 1.52 1.02 0.52 0.02 -0.48 -0.98 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. PAD DITCH 1 - 100 YEAR Triangular Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope (%) N -Value Calculations Compute by: Known Q (cfs) Elev (ft) 5445.00 5444.50 5444.00 5443.50 5443.00 5442.50 = 3.00. 3.00 = 1.00 = 5443.48 = 0.25 = 0.020 Known Q = 4.20 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Tuesday, Nov 12 2019 = 0.84 = 4.200 = 2.12 = 1.98 = 5.31 = 0.66 = 5.04 = 0.90 0 1 2 3 4 5 6 7 8 Depth (ft) 1.52 1.02 0.52 0.02 -0.48 -0.98 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. PAD DITCH 2 - 5 YEAR Triangular Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope (%) N -Value Calculations Compute by: Known Q (cfs) Elev (ft) 5446.00 - 5445.50 5445.00 5444.50 5444.00 5443.50 5443.00 5442.50 = 3.00. 3.00 = 2.00 = 5443.48 = 0.50 = 0.020 Known Q = 2.90 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Tuesday, Nov 12 2019 = 0.64 = 2.900 = 1.23 = 2.36 = 4.05 = 0.57 = 3.84 = 0.73 0 2 4 6 8 10 12 14 16 Depth (ft) 2.52 2.02 1.52 1.02 0.52 0.02 -0.48 -0.98 Reach (ft) Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. PAD DITCH 2 - 100 YEAR Triangular Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope (%) N -Value Calculations Compute by: Known Q (cfs) Elev (ft) 5446.00 5445.50 5445.00 5444.50 5444.00 5443 50 5443.00 = 3.00, 3.00 = 2.00 = 5443.48 = 0.50 = 0.020 Known Q = 10.80 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft's) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Tuesday, Nov 12 2019 = 1.05 = 10.80 = 3.31 = 3.27 = 6.64 = 0.96 = 6.30 = 1.22 i 5442.50 - 0 2 4 6 8 Reach (ft) 10 12 14 16 Depth (ft) 2.52 2.02 1.52 1.02 0.52 0.02 -0.48 -0.98 Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. OFF -SITE DITCH 1 Triangular Side Slopes (z:1) Total Depth (ft) Invert Elev (ft) Slope (°/0) N -Value Calculations Compute by: Known Q (cfs) Elev (ft) 5445.00 5444.50 5444.00 5443.50 5443.00 5442.50 = 3.00, 3.00 = 1.00 = 5443.48 = 0.50 = 0.020 Known Q = 5.00 Section Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth. Yc (ft) Top Width (ft) EGL (ft) Wednesday, Nov 13 2019 = 0.79 = 5.000 = 1.87 = 2.67 = 5.00 = 0.71 = 4.74 = 0.90 AIM 0 1 2 3 4 Reach (ft) 5 6 7 8 Depth (ft) 1.52 1.02 0.52 0.02 -0.48 -0.98 Culvert Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. CULVERT 1 Invert Elev Dn (ft) Pipe Length (ft) Slope (%) Invert Elev Up (ft) Rise (in) Shape Span (in) No. Barrels n -Value Culvert Type Culvert Entrance Coeff. K,M,c,Y.k Embankment Top Elevation (ft) Top Width (ft) Crest Width (ft) 5440 CO 5439 00 5438 00 = 5439.53 = 64.00 = 0.50 = 5439.85 = 18.0 = Circular = 18.0 1 = 0.013 = Circular Corrugate Metal Pipe = Projecting 0.034. 1.5. 0.0553, 0.54. 0.9 = 5442.00 = 50.00 = 10.00 CULVERT 1 Calculations Qmin (cfs) Qmax (cfs) Tailwater Elev (ft) Highlighted Qtotal (cfs) Qpipe (cfs) Qovertop (cfs) Veloc Dn (ft/s) Veloc Up (ft/s) HGL Dn (ft) HGL Up (ft) Hw Elev (ft) Hw/D (ft) Flow Regime Tuesday, Nov 12 2019 = 5.00 = 5.00 = (dc+D)/2 = 5.00 = 5.00 = 0.00 = 3.35 = 4.77 = 5440.71 = 5440.71 = 5441.24 = 0.93 = Inlet Control He Depth IR _.0 .ei 3C 35 4C 45 Embank 111 le: con:roe ,. 75 80 85 Reach i 3 15 215 1 15 0 15 -0 85 -1 35 Culvert Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc. CULVERT 2 Invert Elev Dn (ft) Pipe Length (ft) Slope (%) Invert Elev Up (ft) Rise (in) Shape Span (in) No. Barrels n -Value Culvert Type Culvert Entrance Coeff. K,M,c,Y,k Embankment Top Elevation (ft) Top Width (ft) Crest Width (ft) 5439.44 42.00 = 0.50 5439.65 18.0 Circular 18.0 1 0.013 = Circular Corrugate Metal Pipe Projecting 0.034, 1.5. 0.0553, 0.54. 0.9 = 5442.19 = 24.00 = 10.00 Calculations Qmin (cfs) Qmax (cfs) Tailwater Elev (ft) Highlighted Qtotal (cfs) Qpipe (cfs) Qovertop (cfs) Veloc Dn (ft/s) Veloc Up (ft/s) HGL Dn (ft) HGL Up (ft) Hw Rev (ft) Hw/D (ft) Flow Regime Tuesday, Nov 12 2019 = 5.00 = 5.00 = (dc+D)/2 = 5.00 = 5.00 = 0.00 = 3.35 = 4.77 = 5440.62 = 5440.51 = 5441.04 = 0.93 = Inlet Control Reed+ It) Fox Creek 26 SW Compressor Site Drainage Report APPENDIX H - DETENTION POND CALCULATIONS November 12, 2019 DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Basin ID: (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) 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 mpernousness , = 34 15 cecer: Catchment Drainage imperviousness 1, = 34 15 cer�. -e..,: Catchment Drainage Area A = ' 140 acres Catchment Drainage Area A a 7 140 acres Predevelopment NRCS Sal Group Type = B A 8, C, or D Preoevelopment NRCS Soil Group Type t B 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 Te = 18 minutes rime of Concentration of Watershed Tc = 18 minutes Allowable Unit Release Rate q = 0 45 ctsfacre Allowable Unit Release Rate q = 0 49 cfslacre One -hour Precipitation P. _ • 43 nches One -hour Precipitation P. = 2 47 inches Design Rainfall IDF Formula i = C.' P,l(C:+Tj(•C, Design Rainfall IDF Formula I • CC Pyl(Ci+TJ'C, :oe!t+cient One C, a 28.50 Coefficient One C. = :s f - Coefficient Two C: = - Coefficient Two C; = 10 Coefficient Three C. _ -. ^-oefr'nent Three C, = 0.789 Determination of Average Outflow from the Basin (Calculated): Determination of Average Outflow from the Basin (Calculated): Runoff Coefficient C. 0.33 Runoff Coefficient C = 0.48 Inflow Peak Runoff Op -in = 6.93 cM inflow Peak Runoff Opin a 17.40 cfs Allowable Peak Outflow Rate Op -out = 3.50 der Allowable Peak Outflow Rate Op -out = 3.80 cis Mod. FAA Minor Storage Volume • 4,442 cubic het Mod. FAA Major Storage Volume • 23,105 cubic bet Mod. FAA Minor Storage Volume • 0102 acre -ft mod. FAA Major Storage Volumes 0.830 acte-ft 5 <- Emer Randall Duration Incremental increase Value Here ie g S for 5 -Minutest Rainfall Duration minutes (input) Rainfall Intensity inches f N (output) Inflow Volume we -feet (output) Adjustment Factor "m' (output) Average Outflow der (output) Outflow Volume we -feet (output) Storage Volume acre-feet (output) Rant -we Duration minutes (input) Rainfall inutility inches / hr (output) inflow Volume acre-feet (output) ;apsonertt Factor 'm' (output) Average Outflow cfe (output) Outflow Volume acre-feet (output) Storage Volume sore feet (GISMO 0 0.00 0.000 0.00 0.00 0.000 0 000 0 0.00 0.000 000 0 00 0.000 0000 5 4.81 0.078 100 3.50 0.024 0 054 5 8.31 0.198 100 350 0.024 0172 10 3.83 0.124 1.00 3.50 0048 0.076 10 6.82 0.313 1.00 350 0048 0.204 15 3.22 0 157 1.00 350 0.072 0084 15 555 0.383 t 00 3.50 0.072 0321 20 278 0 181 095 332 0.092 0.069 20 4.81 0454 095 3.32 0 092 0.363 25 2.47 0 200 086 301 0104 0096 25 4.26 0503 0.86 3.01 0104 0399 30 222 0.218 080 280 0 116 0.100 30 3.83 0543 060 2.80 0118 0.427 35 202 0230 0 78 2.65 0128 0 102 35 3.49 0577 0.76 2.85 0.128 0.449 40 186 0242 0 73 254 0140 0102 40 3.21 0807 073 2.54 0140 0.487 45 1 73 0.252 0 70 245 0152 0.100 45 2.90 0.833 0.70 2.45 0152 0482 SD 1.81 0.261 0 68 2.38 0184 0 098 50 2 78 0.857 0.86 2.38 0.164 0493 55 1.51 0270 _ 088 232 0178 0.094 55 2 81 0678 0.00 232 0.178 0503 60 1.43 0.278 0 65 2.27 0188 0.090 80 2.48 0.898 085 2.27 0168 0510 85 1.35 0285 064 2.23 0200 0085 85 233 a716 084 123 0200 0518 70 1.28 0292 063 2.20 0212 0080 70 2.22 0.733 083 2.20 0.212 0521 75 1n 0.298 0 62 2.17 0.224 0.074 75 2.11 0 749 062 217 0.224 0 525 80 1 17 0304 0 61 214 0.236 0068 80 2.02 0.783 061 2.14 0236 0.527 85 1.12 0.309 0 61 2.12 024e 0 061 85 1.94 0.m 081 2.12 0248 0 529 90 108 0315 0 80 210 0280 0054 90 1.88 0.790 080 2.10 0.260 0530 '95 1.04 0.310 0 59 2.08 0.272 0.047 95 1.79 0803 059 2.08 0.272 0530 100 100 0 324 0 59 2.05 0 284 0.040 100 1.73 0014 059 2.08 0.284 0.530 105 096 0.329 0 59 2.05 0296 0.032 105 1.87 0.826 0.59 2.05 0.298 0 529 110 093 0333 0.58 204 0306 0025 110 1.81 0836 058 2.04 0308 0525 115 090 0 337 0.58 202 0320 0017 115 158 0.847 058 2.02 0320 0526 120 088 0.341 0.58 2.01 0333 0.008 • 120 1.51 0657 0.58 201 0.333 0 524 125 085 0.345 0.57 2.00 0.345 0.000 125 1 47 0.866 0.57 2.00 0.345 0.522 130 083 0.348 057 1.89 0357 -0.006 130 1 43 0 875 057 1.99 0 357 0.519 135 0.80 0.352 057 198 0369 -0 017 135 1.39 0.884 0.57 198 0.389 0 516 140 0.78 0355 056 1.97 0.381 -0.025 140 1 35 0.893 056 1.97 0381 0.512 145 0.76 0.350 056 1.97 0.393 -0.034 145 1.32 0.901 0.56 1.97 0.393 0.508 150 0.74 0 362 056 198 0.405 -0 043 150 1.28 0.909 056 190 0.405 0504 155 0.73 0365 058 1.95 0.417 -0.052 155 1.25 0917 056 1.95 0.417 0500 180 0 71 0 368 058 1.95 0.429 -0.061 180 122 0924 055 1.95 0.429 0.495 165 089 0 371 055 1.94 0 441 -0070 165 120 0.932 055 1.94 0441 0481 170 066 0.374 0.55 1.93 0.453 -0.079 170 1.17 0 939 055 1.93 0453 0.486 175 0.66 0 370 0.55 1.93 0465 -0.089 175 1.14 0 948 0.55 1.93 0.465 0481 180 0.89 0 379 0.55 1.92 0.477 -0.098 180 1 12 0.953 M55 1.92 0.477 0475 185 064 0362 055 1.92 0489 -0 107 185 1 10 0.959 055 1.92 0.489 0.470 190 062 0.384 0.55 1 92 0501 -0.117 190 108 0.966 Q55 1.02 0.501 0.464 195 0.81 0.387 0.55 1.91 0.513 -0.128 195 1.08 0.972 055 1.91 0513 0459 200 0.80 0.389 0.55 1.91 0.525 -0 136 200 104 0178 055 111 0.525 0.453 205 059 0392 0.54 190 0.537 -0 148 205 1 02 0.984 0.54 1.90 0.537 0.447 2* 3 0.58 0.304 0.54 1.90 0.549 -0.155 210 1.00 0990 054 1:90 0 549 0 441 215 057 0398 0.54 1.90 0561 -0.165 215 098 0.996 0.54 1.90 0 561 0 434 220 0.59 0.399 0.54 169 0.573 -0 175 220 016 1.001 0.54 1 89 0 573 0.428 225 055 0 401 0.54 1.89 0.568 -0 165 225 095 1.007 054 180 0.588 0.421 230 054 0403 0.54 189 0.598 -0 195 230 0 93 1.012 0.54 1.89 0.598 0.415 735 0.53 0.405 0:54 1.88 0.610 -0.205 235 0.92 1.018 054 1.88 0610 0.406 240 052 0.407 0.54 1.88 0822 -0.215 240 0.90 1.023 0.54 1.88 0.822 0.401 245 0.51 0.409 0.54 188 0.634 -0.225 245 0.69 1.028 054 1.88 0834 0.394 250 0 51 0411 0.54 188 0.648 -0.235 250 0.88 1 033 054 1.88 0 646 0.387 255 050 0.413 0.54 1.87 0658 -0.245 255 0.86 1 038 054 1.87 0658 0.380 280 049 0415 053 1.87 0 670 -0 255 260 085 1 043 053 1.67 0 670 0 373 283 048 0 417 0.53 187 0652 -0 215 265 0.84 1.048 0.53 167 0662 0.368 270 048 0419 053 1.87 0694 .0275 270 083 1 052 053 1.87 0894 0 358 275 0.47 0.421 0.53 1.66 ens -0285 275 061 1 057 0.53 _ 1.86 0706 0 351 280 046 0.422 0.53 1.88 0 718 -0.298 280 0.60 1061 0.53 tee 0.716 0.343 285 0.48 0.424 0.53 186 0.730 -0.306 285 0.79 1.086 053 1.88 0730 0.336 290 0.45 0.426 0 53 1 86 0.742 -0.318 290 0.76 1.070 0.53 1.86 0.742 0326 295 045 0 428 0 53 1 86 0754 -0.326 295 0.77 1.075 0.53 1.88 0.754 0320 300 044 0429 0 53 185 0768 -0.337 300 076 1.079 0.53 1.85 0.788 0313 Mod. FAA Minor Storage Volume (cubic ft) • 4,442 Mod FAA Major Storage Volume (cubic ft) - Mod. FAA Minor Storage Volume (acre -ft) = 0.1020 Mod FAA Major Storage Volume (acre -ft ) • UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2 34, Released November 2013 23,108 0.5384 UD-Detention v2 34 (2), Modified FAA 1111312019, 1215 PM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Basin ID: Inflow and Outflow Volumes vs. Rainfall Duration I Volume (acre-feet) 12 1 0.8 0.6 0.4 0.2 0 0 • • • • • ,• �•OOOp O • OOpOpOpOpp OO O 50 100 150 200 Duration (Minutes) 250 300 sit alto. M•w Volume etas Son Omm-•- WS co Vasa awe a•n•• Wang - . - -• ----—'a,. s,: ,.. . — . - • • •, 5 350 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2 34, Released November 2013 UD-Detention v2.34 (2), Modified FAA 1111312019. 12 35 PM STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: Design Information (Input): Width of Basin Bottom, W = Length of Basin Bottom. L = Dam Side -slope (H:V), 4 = Stage -Storage Relationship: Dim > Silt Sloe L ft ft ftft L Usage Z Check Basin Shape Right Triangle OR Isosceles Triangle OR. Rectangle OR Circle / Ellipse OR. Irregular (Use Ovende values in cells G32:G52) MINOR MAJOR Storage Requirement from Sheet 'Modified FAA: 0.10 Storage Requirement from Sheet 'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum' 0.53 acre -ft acre -ft acre -ft Labels for WQCV, Minor & Major Storage Stages (input) Water Surface Elevation ft (input) Side Slope (H:V) ft/ft Below El. (input) Basin Width at Stage ft (output i Basin Length at Stage ft (output) Surface Area at Stage ft2 (output Surface Area at Stage ft2 User Overide Volume Below Stage its (output) Surface Area at Stage acres (output) Volume Below Stage acre -ft (output) Target Volumes for WQCV. Minor, & Major Storage Volumes (for goal seek) 5429.20 0 0 0.000 0.000 5429 40 0.00 0.00 866 87 0.020 0.002 5429.60 0.00 0.00 3.122 485 0.072 0.011 5429.80 0.00 0.00 5,463 1,344 0.125 0,031 5430.00 0.00 0.00 6.646 2,555 0.153 0.059 5430.20 0.00 0.00 6.872 3,906 0.158 0.090 5430.40 0.00 0.00 7,100 5,304 0.163 0.122 5430 60 0.00 0.00 7.331 6,747 0.168 0.155 5430.80 0.00 0.00 7.564 8,236 0.174 0.189 5431.00 0.00 0.00 7.800 9,773 0.179 0.224 5431.20 0.00 0.00 8.037 11,357 0.185 0.261 543140 0.00 0.00 8.277 12,988 0.190 0.298 5431 60 0.00 0.00 8.519 14,668 0.196 0.337 5431.80 0.00 0.00 8.764 16,396 0.201 0.376 5432 00 0.00 0.00 9.010 18,173 0.207 0.417 5432.20 0.00 0.00 9.259 20,000 0213 0.459 5432.40 0.00 0.00 9.510 21,877 0.218 0.502 5432.60 0.00 0.00 9,764 23,805 0.224 0.546 100-YR WSEL 5432.80 0.00 0.00 10.019 25,783 0.230 0.592 SPILLWAY 5433 00 0.00 0.00 10.277 27,813 0.236 0.638 5433 20 0.00 0.00 10.538 29,894 0.242 0.686 5433 40 0.00 0.00 10.800 32,028 0.248 0.735 5433 60 0.00 0.00 11.065 34,214 0254 0.785 5433 80 0.00 0.00 11.332 36,454 0260 0.837 5434 00 0.00 0.00 11.601 38,747 0.266 0.890 IN/A SN/A #N/A IN/A IN/A IN/A #WA *N/A #WA SNUA IN/A #WA IN/A IN/A IN/A SN/A #N/A IN/A #N/A IN/A #WA *NA IN/A IN/A #WA /N/A /NIA *N/A IN/A #WA IN/A #WA IN/A *NIA #N/A IN/A IN/A IN/A UD-Detention_v2 34 (2). Basin 11/13/2019, 12:35 PM i _ STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: 5435.20 5434.20 5433.20 a) a) + 5432.20 C) t, to (!) 5431.20 5430.20 STAGE -STORAGE CURVE FOR THE POND 5429.20 _ 0.00 0.10 0.20 0.30 0.40 0 50 0 E60 0.70 0.80 0.90 1.00 Storage (acre-feet) UD-Detention_v2.34 (2), Basin 11/13/2019, 12:35 PM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: Basin ID: WQCV Desian Volume (Input): Catchment Imperviousness, I = Catchment Area. A = Depth at WQCV outlet above lowest perforation. N = Vertical distance between rows h = Number of rows. NL = Onfice discharge coefficient. Cc _ Slope of Basin Trickle Channel. S = Time to Drain the Pond = Watershed Design Information (Input Percent Soil Type A = Percent Soil Type B = Percent Soil Type C/D = Outlet Design Information (Output): 33 1 7 14 2 800 300 067 0004 40 1 99 0 percent acres Diameter of holes. D = feet Number of holes per row N = inches ft/ ft hours 04 Height of slot H = Width of slot. W Water Quality Capture Volume, WOCV = Water Quality Capture Volume (WOCV) = Design Volume (WQCV / 12Area • 1.2) Vol Outlet area per row, A0 = Total opening area at each row based on user -input above. A0 Total opening area at each row based on user -input above. A0 0 885 1 Lia inches inches inches 0 157 watershed inches 0.094 acre-feet 0.112 acre-feet 0 61 square inches 0 62 square inches 0 004 square feet O 0 O O o 0 0 0 0 O O O O 0 O 0 O O O O O O O 0 O O O 0 o O O O O O O O 0 • o O o o 0 Perforated Plate Examples Central Elevations of Rows of Holes In fest E Flow Row 1 Row 2 Row 3 Row 4 Row S Rowe Row 7 Row 8 Row 9 Row 10 Row 11 Row 12 Row 13 Row 14 Row 15 Row 1e Row 17 Row 18 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23 5429.20 1 5429.87 1 5430.53 I I IIIII . 1. I I I_ M 1 I I I I Collection Capacity for Each Row of Holes in efs 5429 20 0.0000 0.0000 0.0000 0.00 5429.40 0.0103 0.0000 0.0000 0,01 5429 60 0.0145 0.0000 0.0000 0.01 5429.80 0.0178 0.0000 0.0000 0.02 5430.00 0.0205 0.0083 0.0000 0.03 543020 0.0230 0.0132 0.0000 0.04 5430 40 0 D252 0.0167 0.0000 0.04 5430 60 0.0272 0 0198 0.0061 0.08 5430 80 0.0291 0.0222 0.0119 0,06 5431 00 0.0308 0 0244 0 0158 0.07 543120 0.0325 0.0285 0.0188 0,08 5431.40 1 0.0341 0 0284 ! 0 0214 008 5431 80 0.0356 0 0302 0 0238 0.09 5431 80 0.0370 0 0319 0 0259 0,09 5432.00 0.0384 0.0335 0.0279 0.10 5432-20 0.0398 00351 0.0297 0.10 5432 40 0.0411 0.0385 0.0314 0.11 5432.60 0.0424 0.0380 0.0331 0,11 5432 80 0 0436 0.0393 0.0348 0.12 5433.00 0.0448 0.0406 0-0361 0.12 5433.20 0.0460 0.0419 0.0375 0.13 5433.40 0,0471 0.0432 0.0389 0.13 5433.60 0.0482 0.0444 0 0403 0.13 5433.80 0.0493 0.0455 0.0415 0.14 5434.00 0.0503 0.0467 0.0428 0.14 IN/A ON/A ON/A IN/A NIA IN/A **VA ON/A NIA IN/A ON/A ON/A *NA RNA ON/A NN/A ON/A *NIA SN/A *NIA ON/A IN/A IN/A ON/A *NIA ON/A *NIA *OA IN/A NIA AlN/A *NIA IWA SN/A IN/A S /A IN/A SN/A NWA SN/A ON/A IN/A IN A _ IN A ON/A IWA IN/A IN/A ON/A IN/A NIA IN/A ON/A IN/A IN/A IN/A IWA ON/A IWA MIA IN/A IN/A ON/A ON/A IWA ON/A IWA _ INA SN/A *1/A ON/A MA IN/A ON/A ON/A ONIA Override Area Row 1 Overnde Area Row 2 Overnde Area Row 3 Override Area Row 4 Override Area Row 5 Override Area Row 6 Override Area Row 7 Override Area Row 8 Overnde Area Row 9 Overnde Area Row 10 Override Area Row 11 Overnde Area Row 12 Override Override Area Area Row 13 Row 14 Override Area Row 15 Overnde Area Row 16 Override Area Row 17 Override Override Area Area Row 18 Row 19 Overnde Area Row 20 Override Area Row 21 Overnde Override Override Area Area Area Row 22 Row 23 Row 24 uD-Detenoon_v2 34 (2), WQCV 11/1312019, 12:35 PM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project Basin ID. STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE 5436 00 5434 00 5432 00 5430 00 Stage (feet, elev.) 5428.00 5426.00 5424 00 5422 00 5420.00 0.00 0.02 0 04 0.06 0 08 Discharge (cfs) up Detenoon_v2 34 (2), WOCV 010 0'2 0.14 0.16 11113/2019, 1235 PM RESTRICTOR PLATE SIZING FOR CIRCULAR VERTICAL ORIFICES Project: Basin ID: Dia. To X O 0 / 0 0 \ o G \_O O Sizing the Restrictor Plate for Circular Vertical Orifices or Pipes (Input) Water Surface Elevation at Design Depth PipeNertical Orifice Entrance Invert Elevation Required Peak Flow through Orifice at Design Depth PipeNertical Orifice Diameter (inches) Orifice Coefficient Full -flow Capacity (Calculated) Full -flow area Half Central Angle in Radians Full -flow capacity Calculation of Orifice Flow Condition Half Central Angle (0<Theta<3.1416) Flow area Top width of Orifice (inches) Height from Invert of Orifice to Bottom of Plate (feet) Elevation of Bottom of Plate Resultant Peak Flow Through Orifice at Design Depth Elev WS = Elev• Invert = Q= Dia = Ce _ Af = Theta = Qf = Percent of Design Flow = Theta = A0 = To = Yo = Elev Plate Bottom Edge = Q0 _ Width of Equivalent Rectangular Vertical Orifice Equivalent Width = Centroid Elevation of Equivalent Rectangular Vertical Orifice Equiv. Centroid El. #1 Vertical Orifice #2 Vertical Orifice 5.433.00 5,429.20 390 100 055 0.55 3.14 4.4 114% 2.25 0.48 7.79 0.68 5,429.88 3.9 0.71 5,429.54 feet feet cfs inches sq ft rad cfs rad sgft inches feet feet cfs feet feet UD-Detention_v2.34 (2), Restrictor Plate 11/13/2019, 12:35 PM STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: Basin ID: Design Information (input): Bottom Length of Weir Angle of Side Slope Weir Elev for Weir Crest Coef for Rectangular Weir Coef for Trapezoidal Weir Calculation of Spillway Capacity (output): L= Angle = EL Crest = C;, _ C. _ 22.00 68.20 5.433 00 300 3.00 Water Surface Elevation ft. (linked) Rect Weir Flowrate cfs (output) Triangle Weir Flowrate cfs (output) Total Spillway Release cfs (output) Total Pond Release cfs (output) 5429.20 0.00 0.00 0.00 0.00 5429.40 0 00 0 00 0.00 0 00 5429.60 0 00 0 00 0.00 0 00 5429.80 0.00 0.00 0.00 0.00 5430.00 0 00 0.00 0.00 0 00 543020 000 0.00 000 000 5430.40 0 00 0 00 0.00 0 00 5430.60 0 00 0.00 0.00 0.00 5430.80 000 000 000 000 5431.00 0 00 0.00 0 00 0 00 5431.20 000 000 0.00 000 5431.40 0 00 0 00 0 00 0 00 5431.60 0 00 0.00 0.00 0 00 5431.80 0 00 0 00 0 00 0 00 5432.00 0 00 0 00 0.00 0 00 5432.20 000 000 000 000 5432.40 0.00 0.00 0.00 0 00 5432.60 0 00 0 00 0 00 0 00 5432.80 0 00 0 00 0 00 0.00 5433.00 0 00 0.00 0 00 0 00 5433.20 590 0.13 604 604 5433.40 16.70 0 76 17 46 17.46 5433.60 30.67 2.09 32 77 32.77 5433.80 47 23 4 29 51.52 51.52 5434.00 66.00 7 50 73 50 73 50 #N/A #NIA #N/A #N/'A #N//A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NSA #N/A #N/A #N/A #N/A #N,A #NIA #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #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 #NrA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #NIA #NIA #N/A #N/A #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 #NA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NA #N/A #NrA #N/A feet degrees feet 100-YR 17 4 CFS UD-Detention_v2.34 (2), Spillway 11/13/2019, 12:35 PM STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: Basin ID: r STAGE -STORAGE -DISCHARGE CURVES FOR THE POND Stage (feet, elev.) 0 5435.2 5434.2 5433.2 5432.2 5431.2 5430.2 5429 2 0 Storage (Acre -Feet) 0.2 0.4 0.6 0.8 1 10 20 30 40 50 Pond Discharge (cfs) 60 70 80 p TOTAL DTANRr SPILLWAY rci, ND SIDRAGE J UD-Detention_v2.34 (2), Spillway 11/13/2019, 12:35 PM HighPornt RESOURCES EMERGENCY RESPONSE PLAN FOX CREEK 26 SW COMPRESSOR STATION NW 1/4 SW 1/4 OF SECTION 26, TOWNSHIP 12 NORTH, RANGE 63 WEST OF THE 6th P.M. COUNTY OF WELD, STATE OF COLORADO DRAFT REVISION - NOVEMBER 20191114 HighPoint RC' UURCC) 1.0 INTRODUCTION 1 2.0 FACILITY -SPECIFIC INFORMATION 1 3.0 EMERGENCY COMMUNICATIONS PROCEDURES 2 3.1 HPR INCIDENT LEVELS 2 3.2 HPR INCIDENT MANAGEMENT CHAIN OF COMMAND 3 3.3 COMMUNICATION TECHNIQUES 5 3.4 MEDIA COMMUNICATIONS 6 3.5 NOTIFICATION OF EMPLOYEE'S FAMILY 6 4.0 ON -SCENE INCIDENT COMMAND 6 5.0 PRESERVATION OF EVIDENCE AND SITE SECURITY 6 6.0 EMERGENCY RESPONSE SCENARIOS 7 6.1 RESPONSE TO AN INJURY OR ILLNESS 7 6.2 RESPONDING TO A LEAK OR SPILL (Coordinate with SPCC Plan as applicable) 8 6.3 RESPONDING TO A FIRE 9 6.4 RESPONDING TO A H2S RELEASE 6.5 RESPONDING TO INCLEMENT WEATHER 6.6 RESPONDING TO A BOMB THREAT OR TERRORIST ACTIVITY .13 6.7 RESPONDING TO UNAUTHORIZED VISITORS / PROTESTORS 15 FIGURE FIGURE 1 APPENDICES APPENDIX A APPENDIX B APPENDIX C APPENDIX D APPENDIX E APPENDIX F 9 FOX CREEK 26 SW COMPRESSOR STATION PLOT MAP HPR CONTACT INFORMATION EMERGENCY SERVICES CONTACT INFORMATION EMERGENCY MEDICAL FACILITY DIRECTIONS AGENCY CONTACT INFORMATION HELICOPTER LANDING ZONE PLAN REVIEW LOG ii 12 HighPoint -RESOURCES- 1.0 INTRODUCTION Serious incidents. unless properly and effectively managed, can result in loss of life and damage to public or private property. Serious incidents can also generate complex technical, legal, and public relations problems. It cannot be overemphasized that the best way to handle emergency situations is to prevent their occurrence. However, when incidents do occur. prompt and proper response can mitigate damage and minimize business interruption and financial impact. This Emergency Response Plan (ERP) is designed to help HighPoint Operating Corporation (HPR) field personnel respond quickly and effectively to the problems presented by serious incidents. Within this ERP you will find guidance for responding to emergency incidents and descriptions of the duties that must be accomplished when a serious incident occurs. This ERP provides field personnel with tools and procedures for handling such incidents effectively. This ERP is for the Fox Creek 26 SW Compressor Station. and was prepared: To serve as the basis for an organized action plan in dealing with emergencies and spills of all magnitudes: 2. To spell out responsibilities and priorities in countering an emergency situation or major spill 3. To provide information on the means for handling serious incidents and provide the tools to properly document incidents and incident response: and 4. To tabulate the contact information for the personnel and agencies that must be notified in order to promptly and properly respond to an emergency incident. Prompt action is mandatory. For this reason, the content of this ERP must be understood and readily available to all HPR field personnel. All involved employees should be informed to take quick action to protect life and property and to immediately report the incident. The ERP will require modification from time to time, as field personnel change, as technologies advance, and as experience indicates improvements. The ERP is to be reviewed annually by Environment, Health, and Safety (EH&S) and operations staff to ensure that it is up to date. This ERP is not intended to replace existing Spill Prevention, Control, and Countermeasures (SPCC) plans or other required plans. but rather its purpose is to be a supplement providing general guidelines for emergency situations. 2.0 FACILITY -SPECIFIC INFORMATION This ERP has been developed for the HPR Fox Creek 26 LOCATED IN THE NW 1/4 SW 1/4 OF SECTION 26. TOWNSHIP 12 NORTH, and RANGE 63 WEST OF THE 6th P.M. COUNTY OF WELD, STATE OF COLORADO The HPR Fox Creek 26 Compressor Station consists of separation equipment, and compressor buildings used for treatment and compression of gas for sale. HighPoint RESOURCES The entire facility is equipped with an Emergency Shut -Down (ESD) system that will incorporate both manual and automatic compressor and gas supply shut -downs. The ESD system will incorporate gas detection equipment in the compressor buildings to actuate automatic ESD of the facility. All electrical equipment installed will comply with appropriate hazard class locations or accepted industry practice in order to minimize fire and explosion potential associated with this equipment. Equipment will have guard posts installed when the potential for traffic impact with the equipment is likely. Pressure relief valves will be in place on the compressors, the slug catcher, the fuel gas scrubber. and the filter separators. These will minimize the potential for hazardous pressure build-up and explosion. The entire site will be fenced and will be a no smoking area. All appropriate hazard warning signage will be in place on the site entrance and applicable equipment. 10-. 20-. and 30 -pound rated fire extinguishers will be located in key locations throughout the site. 3.0 EMERGENCY COMMUNICATIONS PROCEDURES Prompt reporting of EHS incidents is critical to ensure HPR Management and EHS staff have been informed of an incident so they can provide guidance and resources as necessary. Prompt reporting is also necessary to ensure that all appropriate regulatory agency notifications are made in a timely fashion. 3.1 HPR INCIDENT LEVELS HPR has created criteria to classify incidents by level of severity so appropriate and uniform notifications and response actions can be taken. The criteria presented below are to be utilized to determine if an incident is a Level 1. 2, or 3 incident. The level of the incident will then determine what notifications are necessary and by what means incidents are to be communicated within the HPR organization. Level 1 - Lowest Level: 1. An incident without fire. recordable injuries, public involvement, or adverse media involvement, typically reported as a near miss or a first aid incident. 2. Any reportable spill that does not reach water or a drainage feature.* 3. _ Minor unplanned and uncontrolled gas or vapor release. 4. Vehicle accident without injury and/or damage less than $5,000. 5. Property damage less than $5.000. *Note: Any spill of any level should be reported to EH&S. Level 2 - Intermediate Level 1. Incidents involving recordable or serious injury to employees, contractors, or the public. 2. Gas or vapor release requiring employee or contractor evacuation. 3. A fire that can be managed with internal resources immediately controlled and extinguished. 4. Any spill to water. 5. Vehicle accident with injury and/or damage greater than $5,000 but less than $10,000. HighPoint RESOURCES 6. Property damage greater than $5,000 but less than $50,000. 7. Significant Notices of Violation. fines, penalties. administrative orders, etc. received from any government agency. Level 3 - Highest Level I. Incidents involving death or multiple injured employees, contractors. or the public. 2. Gas or vapor release requiring evacuation of third parties. 3. Major spills. toxic gas releases. or other significant environmental damage. 4. Blowouts. 5. Fires not immediately controlled and extinguished. typically fires that involve third -party emergency response. 6. Vehicle accident with damage greater than $10.000. 7. Property damage greater than $50.000. 3.2 HPR INCIDENT MANAGEMENT CHAIN OF COMMAND When an emergency is identified. immediate notification must be made as soon as possible in accordance with the guidance presented in this ERP. The first person to identify the emergency will report it to their supervisor. If a person's supervisor cannot be immediately reached with the known contact information (i.e., telephone numbers of office. mobile phone. home. or pager) then the next person in the chain of management must be notified. The supervisor or the first person ultimately notified by the employee discovering the incident will initiate the appropriate HPR emergency incident notification tree in accordance with the diagrams below. HighPoint •' URCES= HPOC Incident Communication EMPLOYEE 0ISCOVEAI NG I t;aDENT DRIIJNG OR CCIMPUT►ON :CTT.TT'e DP.ILt.G CCPvWPLETOt.S M&MGEA IMMEDIATE SUPERVISOR } 911 r;I' appropriates FOREMAN APED:OP AREA SUPERINTENDENT T PRODUCTION MANAGER. T COO SENIOR DIRECTOR. P1IODUCTION HUNAN RESOURCES Murl'.% new; 4 } GENERAL COUNSEL t _ Eft REPRESENTATTvE T DIRECTOR. EHE5 } REGULATOR( AGENC ES HighPoint RESOURCES - 3.3 COMMUNICATION TECHNIQUES The following guidance will be followed when making any notifications regarding an incident. 1. Communication must be through a two-way confirmed means. Use of messages on voice mail or sending e-mail does not constitute notification. Level 1 incidents not involving a spill may be communicated via e-mail. In all instances. a message may be left, but the next person up the chain of command must also be contacted. 2. Supervisors or others dealing with the incident may delegate reporting responsibilities as appropriate. However, when delegating these responsibilities, always instruct the person to report back to you. 3. Make sure the person you are communicating with understands you. This can be done by asking them to repeat the key parts of your discussion. 4. If you are calling someone you do not frequently talk to, make sure you identify yourself and where you can be reached. 5. If working with radio communication, call out the person you want to talk to followed by your name (e.g.. "Kurt, this is Greg, do you read me?") Wait long enough for a response. The person may be away from the radio and may need some time to get back. 6. If calling by telephone, let the phone ring at least six times before hanging up. 7. Do not hesitate to call above your supervisor if your supervisor is unreachable. 8. Have relevant information available before starting notification. This does not mean a complete report of everything but has the following at a minimum. a. Location or facility and call back phone number. b. Type of emergency. c. Time and date first noticed. d. The magnitude of emergency (e g., size of fire or spill, the number of people involved, injuries. if other properties or companies are involved). e. What you have done prior to making your notification. f. What your plans are in responding to the emergency. g. What are the weather conditions? h. What, if any, outside notifications have been made. What assistance you need. j. When you will call back with a subsequent report. A.b) HighPoint _ RESOURCES 3.4 MEDIA COMMUNICATIONS Communications with media and local government officials are best handled by persons trained in dealing with the media. All media inquiries should be directed to the Legal Department unless the specific direction is given by these groups to individual personnel. Estimates or speculations as to the cause or size of the problem must never be made. Assume any camera or recorder in the area is ON at all times (it just may be). Encourage the media to speak with Legal Department personnel in the Denver office for any detailed information. 3.5 NOTIFICATION OF EMPLOYEE'S FAMILY All notification of family in the event of serious illness or injury will be the responsibility of the Human Resources Department. with the assistance of the Area Superintendent. It is important that family notification not be made prematurely and that certain facts are gathered before notification. 4.0 ON -SCENE INCIDENT COMMAND Refer to Section 3.2. 5.0 PRESERVATION OF EVIDENCE AND SITE SECURITY In the aftermath of a serious incident, it becomes necessary to investigate the incident in order to determine the cause and corrective actions. Perhaps the most important aspect of this investigation is determining the facts, and as such. the preservation of the evidence is of great importance. With the assistance of field personnel involved at the incident scene, the evidence can be preserved and a more beneficial investigation performed. The following are basic guidelines which should be followed. Secure the Area Rope off or otherwise control access into the incident site. Access by non -company personnel (including contractor personnel even if involved in the incident) is NOT allowed unless specific management approval has been obtained. Establish a gate guard and ensure that a sign -in sheet is maintained so anyone who entered the facility can be identified at a later date. ALWAYS ask agency personnel to present identification and try to get a business card. The only exception is necessary to access by emergency medical rescuers and firefighters. Preserve the Evidence As much as possible. do not disturb objects relating to the incident. If unavoidable, stake or mark its location and record what was there. preferably by taking a series of photographs that show the object in question and nearby permanent landmarks so the scene can be recreated if necessary. Never allow evidence to leave the scene without approval. HighPoint RESOURCES Document the Evidence Take notes. photographs. and or voice notes about EVERYTHING. You cannot create too much documentation. Remember. you are documenting site conditions for reference YEARS in the future. Take immediate steps to protect all documentation and immediately provide any documentation to the leader of the incident investigation team after the initial emergency response actions have concluded. Identify Witnesses If persons who witnessed the incident cannot remain on the scene to be interviewed during the investigation. get their names and pertinent information so they can be located later. 6.0 EMERGENCY RESPONSE SCENARIOS 6.1 RESPONSE TO AN INJURY OR ILLNESS 1. Shut down all work activity. 2. Assess the situation and severity. If safe to do so. remove or mitigate any immediate hazards that could further injury or cause injury to other emergency responders. 3. Contact 911 /Emergency services (as needed). • Follow the instructions of the operator at all times. • Provide as much information as possible to the operator. 4. Send a designated person to the nearest county road or street intersection to wait for emergency services. If you think a helicopter evacuation may be necessary, direct an individual to establish a landing zone. 5. The employee(s) at the scene who is/are most qualified to do so will render first aid or assistance and assign field personnel to initiate HPR emergency notification protocol. Notification will include, at a minimum, the following. • Date and time of the incident. • Location of incident (with directions to the site). • Description of incident and nature of injuries. • Location where injured employee was moved to. • The identity of emergency services present at the site. • Other considerations (media attention. regulatory agencies at the site, etc.) 6. All unneeded field personnel. contractors. and visitors who are not assisting the victim should be evacuated from the site by directing them to assemble at the facility's designated primary area. HighPoint RESOURCES 7. Area Superintendent or Foreman (or designee) will complete the appropriate incident report form and submit to local Health and Safety (H&S) coordinator or EHS Manager. 8. EHS Manager or designee will notify appropriate regulatory agencies and the Legal Department in accordance with the HPR incident communication protocol. 6.2 RESPONDING TO A LEAK OR SPILL (Coordinate with SPCC Plan as applicable) 1. Shut down all work activity. 2. Evacuate all unneeded field personnel, contractors. and visitors from the site. • Send all unneeded persons to appropriate muster area. • Keep all persons uphill and crosswind from the chemical source. 3. Assess the situation and severity. If safe to do so, take actions to safely stop the release. contain it to the location. and prevent the spill from reaching surface water. 4. Contact 911 /Emergency services (as needed). • Follow the instructions of the operator at all times. • Provide as much information as possible to the operator. 5. Send a designated representative to the nearest county road or street intersection to wait for emergency services. 6. Notify the appropriate supervisor who will, in turn, initiate the HPR incident communications protocol. Provide details of the estimated volume spilled, the status of discharge. and other details that will facilitate response and cleanup. 7. The Area Foreman will mobilize material, equipment, and manpower to stop, contain. and clean up the discharge of the spill. The Area Foreman will also complete the appropriate HPR incident reporting forms. 8. EH&S personnel will: a. Notify appropriate regulatory agencies and the Legal Department: b. Complete the appropriate agency incident reports: and c. Provide remediation guidance. Notes: a. For the guidance of the proper handling and disposal of wastes generated during spill response and cleanup. contact EH&S Dept. b. All spills (crude oil. condensate, produced water, hazardous chemicals, or exploration and production waste) greater than one barrel or any volume that affects surface water or groundwater needs to be reported to the Area Foreman and the EH&S Department immediately. HighPoint c. What is "surface water"? In addition to ponds. lakes. streams. and rivers. "surface water (or navigable waters) " can be defined as dry ditches. irrigation canals. wetlands, sloughs, and any other natural or man-made surface feature that contains water at least part of the time. 6.3 RESPONDING TO A FIRE 1. Shut down all work activity. 2. Evacuate all unneeded field personnel. contractors. and visitors from the site. a. Send all unneeded persons to appropriate muster area. b. Keep all persons uphill and crosswind from the chemical source. 3. Assess the situation and severity. If safe to do so. take actions to safely extinguish the fire and/or eliminate the fuel source. Attempt to fight the fire if: • You know what is burning. • You have adequate training to fight a fire, • You have the adequate tool to fight a fire. and • You have a safe exit out. 4. Contact 911 /Emergency services (as needed). • Follow the instructions of the operator at all times. • Provide as much information as possible to the operator. 5. Send a designated representative to the nearest county road or street intersection to wait for emergency services. 6. Notify the appropriate supervisor who will, in turn, initiate the HPR incident communications protocol. Provide details of the incident and other details that will facilitate response. 7. Control access to the site - only allow approved personnel and emergency services to enter the site. 6.4 RESPONDING TO A H2S RELEASE 1. Refer to the hydrogen sulfide (H2S) safety program for complete details on working with H2S safely. 2. Prior to beginning work. establish roles and responsibilities for crews working on job sites that may contain H2S. H2S MONITORING/CLIMATIC CONDITIONS TEAM — Responsible for monitoring ambient air concentrations or hazardous gases near a leak area. calculating H2S radius of exposure. and monitoring climatic conditions (wind direction, wind velocity. HighPoint RL>()UP: E, etc.). The team coordinator will keep the Communications Team advised of the monitoring results and any changes that occur. b. ROAD BARRICADE — Responsible for establishing roadblocks in areas affected by a potentially hazardous leak. Team members may be assisted by the sheriffs department and/or the Department of Public Safety. c. PUBLIC RELATIONS. COMMUNICATIONS. AND DOCUMENTATION TEAM - Responsible for coordinating teams. communications between team members. and coordinating duties of public safety officials. The team will document a record of events and the safety and control measures taken during the incident. The coordinator of this team will keep the Superintendent up to date on leak events relating to public relations with the news media, public. and various public safety/fire officers. Safe areas will be established as appropriate. d. EVACUATION TEAM (FIELD) — Team members will be responsible for notifying and evacuating residents from a hazardous area to a place of safety. 3. Response Team Members and Duties Form will be completed by Operations personnel for all H2S operations activities. 6.4.1 When an H2S Leak Occurs 1. Shut down all work activity. 2. Evacuate all unneeded persons from the site. a. Evacuate uphill and crosswind from a chemical source. b. Be conscious of wind. c. Send all unneeded persons to appropriate muster area. Keep all persons uphill and crosswind from a chemical source. Assess the situation and severity. d. Take actions to safely stop the release. Follow respiratory protection guidelines. 3. Contact 911/Emergency services (as needed). a. Follow the instructions of the operator at all times. b. Provide as much information as possible to the operator. c. Send a person to the nearest county road or street intersection to wait for emergency services. 4. Administer First Aid/CPR to any affected persons. • Follow First Aid/CPR guidelines. 5. Control access to the site. • Only allow approved personnel and emergency service to enter the site. 6. You may be required to establish a landing area for a helicopter. HighPoint RESOURCES= • Follow the helicopter landing guidelines. 7. Follow the HPR incident reporting procedure. 6.4.2 Responding to H2S Leaks A leak may be detected and/or reported by various individuals/the public. HPR personnel. contractors, public safety officials, etc. 1. Once a leak has been determined to be from an HPR facility, the following information will be obtained and relayed to the Superintendent/Area Foreman/designee: • Type of leak. • Personal injuries. • Location and magnitude of the leak. • Direction and velocity of the wind. • Residents, businesses. and highways located downwind of the leak. • Your action and/or advice concerning the evacuation of nearby residents and businesses or establishing roadblocks. • The action being taken to alleviate the situation. • Time emergency occurred or was reported. • Estimate of damage to date and potential future damage. 2. The Superintendent/Area Foreman or designee will be in charge of the actual on -site operations. 3. The Superintendent/Area Foreman or designee will assign someone to monitor the company radio frequency. Carry a 2 -way radio or bring a company truck with radio as close as safely possible and maintain communications with response personnel. 4. The highest ranking HPR employee will be in charge of all actions until the Superintendent/Area Foreman or designee arrives. Personal protective equipment (PPE) should be used as appropriate. 5. Operating personnel will attempt to determine the seriousness of the situation and notify immediately other field personnel in the area. 6. Gather all field personnel, contractors, and visitors at the rendezvous point, depending on the release location. 7. Recall employees if the emergency happens off -hours. (Numbers are listed in the contact information section of this ERP.) 8. Contact EH&S personnel. 9. Maintain a log of all contacts with residents. regulatory and law enforcement agencies, other operators. etc. HighPoint RESOURCES - 10. Determine whether assistance is needed from public safety officials. 11. Operating personnel should attempt (from a safe area) to shut-in the leak and be alert for chemical and/or liquid hydrocarbon run-off. If chemicals are involved in a fire. think of the consequences before you use water on the fire. It may be better to contain the fire and let the chemicals incinerate. Close off the area. If you do not have the necessary equipment, appropriate heavy equipment contractors should be contacted. 12. If injuries have been sustained, start first aid procedures and call for ambulance service if needed. organize search and rescue if anyone is still unaccounted for. 13. If gas escape cannot be safely shut-in, stopped. etc., and presents a hazard to residents, field personnel, or property, the following steps should be taken. Determine if the sour gas being released should be safely ignited to protect residents. The appropriate agency should be contacted for approval prior to any flaring of sour gas. b. Initiate Evacuation Procedure. 6.5 RESPONDING TO INCLEMENT WEATHER If weather becomes severe to the point it threatens the safety of workers. it is a best practice to evacuate or "cab up" until safe to return to work. 1. Contact supervision to determine the severity of the storm. 2. Shut down all work activity. 3. If possible, shut-in wells and production equipment. 4. Evacuate all unneeded persons from the site. 5. Assess the situation and severity of the situation. TORNADO - It may not be best to evacuate. Use the best judgment if a tornado is in sight. Go to the lowest point possible (i.e.. ditches. culverts. creek bottoms). Do not stay in a vehicle! Lay face down and cover your head with your hands. Keep all PPE on; this can help protect you from flying debris. Wait for the storm to pass. THUNDER/LIGHTNING — When you see lightning or hear thunder. `cab up" in a vehicle for 30 minutes from the last sighting. If lightning or thunder continues for more than one hour. shut crews down and contact your supervisor. HIGH WINDS — Do not work at heights. If a crane is being utilized, shut it down when winds become higher than 25 miles per hour (mph). -Cab up" and wait for the wind to stop. Keep all PPE on while in high winds. PPE can help protect from flying debris. HighPoint ES _. SEVERE RAIN — If driving and severe rain occur. pull to the side of the road and wait for the rain to pass. Pull as far to the right as possible. Turn on hazard lights. If on a work sight, "cab up" until the rain passes. FLOODING — If you are in an area that is prone to flooding, never attempt to stay on location when flooding occurs. Find the best route to high ground and remain until safe. Never drive through standing water. HAIL — If hail occurs while on site. keep PPE on at all times. PPE can help protect you from falling ice. Seek shelter in a building or vehicle until the storm passes. WINTER WEATHER (Blizzards and severe snow storms) — If severe winter weather occurs while on site, contact the National Weather Service. listen to the radio or television, or communicate with your supervisor to monitor the storm. Avoid unnecessary driving and seek shelter immediately. 6. Contact 911 /Emergency services (as needed) If you're trapped by floods or there is an injured person. ▪ Follow the instructions of the operator at all times. • Provide as much information as possible to the operator. • Send a person to the nearest county road or street intersection to wait for emergency services. 7. Administer First Aid/CPR to any affected person as needed. • Follow First Aid/CPR guidelines. 8. Control access if the site is not safe. • Only allow approved personnel and emergency services to enter the site. 9. You may be required to establish a landing area for a helicopter. 10. Follow the HPR incident reporting procedure. 6.6 RESPONDING TO A BOMB THREAT OR TERRORIST ACTIVITY Bomb threats have become fairly common place. You may be confronted with this situation at any time. Bomb threats are frequently for the purpose of annoyance rather than destruction. However, each situation must be approached as though the bomb threat is a reality. Approach a bomb situation calmly, cautiously. deliberately, and without delay. Be alert: it may be a highly dangerous situation or merely a prank: therefore, avoid the hysterical or excited approach. If evacuation appears to be desirable, limit the alarm and evacuation to the area probably affected. Don't use cellular phones (turn them off) or communication radios if a call comes in. This could detonate certain types of devices. The bomb type may be incendiary or an explosive device used for material destruction, disruption of normal activities, or to disturb employee morale. A bomb threat may be received by anyone in the company. It is important that a call of this nature HighPoint - RESOURCES be handled in accordance with an established plan. Be sure to obtain the necessary information and notify your supervisor. 1. SUPERVISOR'S RESPONSIBILITY • In order to detect. prevent, or minimize the effect of sabotage. each supervisor should critically analyze their situation with respect to vulnerability to sabotage and make appropriate improvements to protect against sabotage. 2. ACTIONS a. Immediately safeguard personnel — including any other affected parties (other offices, or residents). b. If it is a telephone threat. remain calm and get as much information as possible. Time of call. As close as possible to the exact wording. Sex and age of caller (if identifiable) (young, old, etc.). Foreign or identifiable accents. Distinguishable background noise. Bomb location (specific as possible). When the bomb is supposed to detonate. Kind and size of the bomb. How the bomb got into the facility. c. Assemble all non -essential personnel at the staging area and ensure that Sight Security accounts for everyone. Evacuate to a safer location if necessary. d. Plan to combat the emergency and minimize damage. e. Notify Building Management. f. Notify the sheriff's department (911). 6.6.1 Unknown Location of Bomb 1. As field personnel sweep their assigned areas. have them look for anything out of the ordinary. 2. Any suspicious item may be a bomb. DO NOT TOUCH THE DEVICE. REPORT THE LOCATION TO THE INCIDENT COMMANDER 3. If the location is determined, evacuate the immediate area. (Size of area evacuated determined by the hazards) 4. Notify upper Management and sheriffs department. 5. Assist sheriffs department as necessary HighPoint RESOURCES - 6. Establish a hot zone 6.6.2 Exploded Bomb 1. Preserve any evidence if possible! 2. Assist any injured personnel in the safest possible manner. 3. Protect the rescuers so there are not more victims. 4. Notify the sheriff's department and fire department if necessary. 5. Notify the hospital of patient status and help them decide if more response is necessary. 6. React correctly to any fire problems to minimize hazards and equipment damage. 7. Notify management. 6.6.3 Extortion Threats 1. If money is mentioned. collect all the information listed in step 6.6. 2. Advise the caller that all requests for money must go through management personnel. 3. Transfer the call, ensuring you do it properly. and await instructions from supervisors. 6.7 RESPONDING TO UNAUTHORIZED VISITORS / PROTESTORS You may be confronted with unauthorized visitors and/or protestors at any time. Approach the situation calmly. cautiously, deliberately. and without delay. Be alert: it could develop into a highly dangerous situation; therefore, avoid the hysterical or excited approach. If evacuation appears to be desirable, limit the alarm and evacuation to the area probably affected. A civil protest will usually take the form of an organized public demonstration of disapproval or display disagreement with an idea or course of action. It should be noted that in many cases. protests such as marches. meetings. picketing. and rallies will be peaceful and non -obstructive. A protest should not be disrupted unless one or more of the following conditions exists as a result of the demonstration: • Disruption of the normal operations of the HPR facility. • Obstructing access to offices, buildings. or other HPR facilities. • The threat of physical harm to persons or damage to HPR facilities. • Willful demonstrations within the interior of any HPR building or structure, except as specifically authorized and subject to reasonable conditions imposed to protect the rights and safety of other persons and to prevent damage to property. • Unauthorized entry into or occupation of any HPR room. building. or area of the campus. including such entry or occupation at any unauthorized time. or any unauthorized or improper use of any HPR property, equipment. or facilities. 1. IMMEDIATE ACTION AND DECISION MAKER(S) ,9%) HighPoint - RESOURCES - If any of the above conditions exist, the local police or sheriff's department should be notified. Depending on the nature of the protest, the appropriate procedures listed below should be followed. a. Peaceful, Non -Obstructive Protest Generally, peaceful protests should not be interrupted. Protestors should not be obstructed or provoked and efforts should be made to conduct HPR business as normally as possible. If protestors are asked to leave but refuse to leave. arrangements may be made by HPR management to treat the violation of regular operating hours as a disruptive protest. b. Disruptive Protests In the event that a violent protest in which injury to persons or property occurs or appears imminent. the following will occur. 2. ACTIONS a. Immediately safeguard personnel — including any other affected parties (other offices. or residents) b. Assemble all non -essential personnel at a staging area and ensure that Sight Security accounts for everyone. Evacuate to a safer location if necessary. c. Plan to combat the emergency and minimize damage. d. Notify facility management. e. Notify the sheriffs department (911). Efforts should be made to secure positive identification of protestors in violation to facilitate later testimony. including photographs if deemed advisable. Additionally. efforts should be made to videotape any police action for future reference. 1. SUPERVISOR'S RESPONSIBILITY • In order to detect, prevent, or minimize the effect of sabotage. each supervisor should critically analyze their situation with respect to vulnerability to sabotage and make appropriate improvements to protect against sabotage. HighPoint FIGURE 1 FOX CREEK 26 SW COMPRESSOR STATION PLOT PLAN _ , .._..- I i I_ w — %W ea. ♦ • I • I-' . • 40 • ♦ J r _CSamss I • • • ♦ • • • • • I r a.a...0 M yl roe tope MOO r atereeedo -r .M*CT LCCATUI/ I f VAS SO as r r a: It as aa. as- La ear) • - •I I. 7as OAL aR6L1M01A 'Cm llwR�aa.1- KIIISss a- — 1.._ has a YAM r Sae sI VICINITY MAP S AEI W as a.a 1 lag RESOURCES - T I —II— — J — .aaar..— : — — • !.J N ---St - - I - -I -♦ I st togas -.. aaa Va.. •.- sea a I • II' • I p II ran r r. 4.� 'Is — 1 ,1 ao+RY 'i. pip a/ p a S D tI,J R' f • Ili fi ,.^.{; — I I �K. ?sale' ----tri. I v' 4 �j 1 a.w:.. 1:19 �!�1yy i J © s -nuns.: • COMPRESSOR PAD O `•�; .MZ"' 4 ` d `Tpge SPa..aas�MS flan wet. Rein M1 -err OW SEA IS 10116: - ales a vs . S a aaaaal — Sip WW1 Itur cis VMS ..— al(W '++•a---- PSIS ti -a► aa'a - - �+--- ICJ- R U R ale r' • nut pC.MTv YAP L.: ‘Xte lea0631". ate sae. 000110.. PARCEL BOUNDARY MAP At :ii -' _. r2....... 24 S1 :maw - -� - � I -r '5 — 34 lCTOM a 77 141$6„ T17. MIL SNP al I I I r I I re rI r or g It i e 1- V HighPoint APPENDIX A - HPR CONTACT INFORMATION HPR CONTACT LIST OFFICE MOBILE Toll -Free 24 -Hour Emergency Number: 1-800-880- 6359 Rusty Frishmuth —Director, EH&S 303-312-8718 303-518- 2290 Doug Dennison — Director, Community Affairs 970-353-0407 ext. 970-270- 6015 2853 Dustin Watt — Sr. EHS Specialist 970-353-0407 ext. 303-656- 6005 1838 Scot Woodall — Chief Executive Officer & President 303-312-8610 Paul Geiger — Chief Operating Officer 303-312-8787 Ken Wonstolen — SVP, General Counsel 303-312-8170 Mike Jury — Maintenance Foreman 970-353-0407 ext. 6018 970-319- 6184 Brett Paben — Area Superintendent 970-353-0407 ext. 6003 970-319- 4690 Scott Rippy — Production Foreman 303-294 7810 Dustin Stransky — Production Foreman 303-294- 7805 Michael Herricks — Construction Foreman 970-353-0407 ext. 970-987- 6016 3827 RESOURCES HighPoint RESOURCES APPENDIX B - EMERGENCY SERVICES CONTACT INFORMATION ALL Emergencies 911 DJ BASIN - COLORADO EMERGENCY SERVICES PHONE LIST LAW ENFORCEMENT Colorado State Patrol — District 1A. 3C 303-239-4501 Weld County Sheriff 970-304-6467 Greeley Police Department 970-356-4015 FIRE Briggsdale Fire Department 970-350-9600 x4 HOSPITALS Cheyenne Regional Medical Center — West Campus 307-634-2273 Greeley- North Colorado Medical Center 970-352-4121 Flight for Life 720-321-3900 CONTRACTORS Custom Environmental Services, Inc. 303-423-9949 HighPoint - RESOURCES APPENDIX C - EMERGENCY MEDICAL FACILITY DIRECTIONS Driving directions from Fox Creek 26 SW Compressor Station to Cheyenne Regional Medical Center - West Campus Head east on County Road 136.5 toward County Road 71 Unpaved Road Turn left onto County Road 71 Road name changes to County Road 147 Continue on Chalk Bluff Rd. Take Rd 209/Campstool Rd and 1-80 W to E 23rd St in Cheyenne Turn left onto Chalk Bluff Rd Turn right onto County Rd 138 Continue onto Co Rd 138 Continue onto Rd 209/Campstool Rd Turn left to merge onto 1-80 W toward Laramie Turn right onto I-180 N/1-25BL/US-85 N (signs for Central Ave) Drive to E 23rd St Cheyenne Regional Medical Center - West Campus, 214 E. 23rd St., Cheyenne. WY 82001 Driving directions from Fox Creek 26 SW Compressor Station to North Colorado Medical Center Head east on CR 136.5/Weld County Rd 136.5 toward Co Rd 71 23 ft Turn right onto Co Rd 71 0.5 mi Turn left onto CR 136/Weld County Rd 136 Turn right onto Co Rd 77 27.0 mi Continue onto CO -392 W Turn left onto Co Rd 47 Slight right toward E 8th St Slight right onto E 8th St 3.1 mi Turn left onto US -85 S Turn right at the 1st cross street onto 13th St Turn left onto 21st Ave Turn left Sharp right, destination will be on the right. North Colorado Medical Center, 1801 16th Street Greeley. Colorado 80631 0.8 mi 2.8 mi 28.8 mi 9.5 mi 1.2 mi 2.5 mi 8.6 mi 5.2 mi 1.6 mi 459 ft 2.9 mi 18 mi 3.7 mi 213 ft. 0.5 mi 1.7 mi 0.3 mi 325 ft. 187 ft. HighPoint - RESOURCES APPENDIX D - AGENCY CONTACT INFORMATION REGULATORY AGENCIES COGCC 303-894-2100 CDPHE 877-518-5608 WELD COUNTY O&G LIASON 970-304-6496 x4395 NATIONAL REPORTING CENTER (NRC) 800-424-8802 EPA Region V111800-277-8917 FED EPA: CO. UT. WY 303-312-6312 OSHA -CO 303-530-6901 Weld County Office of Emergency Management. Attn: Roy Rudisill Office 970-304-6540 Cell 970-381-0417 HighPoint — RESOURCES — APPENDIX E — Helicopter Landing Zone Landing Zone (LZ) Criteria 100' Wide X 100' Long Level with a firm surface Clear of sand, gravel and other debris No power lines trees. poles, buildings or other overhead obstructions near or in the area No vehicles or people within the zone Avoid sloped areas ?Sill 1 � r L Inn _ Marking the Landing Zone (LZ) Weighted construction cones Two vehicle8 with headlights crossed at the center of the LZ Smoke canisters during daylight operations Battery operated strobe lights Cylume Chem-lite Sticks Markings such as barrier tape. flag tape etc should not be used .s. nom Casea LZ Coordinator Responsibilities Command and secure the LZ Establish radio contact with aircraft Assist pilot in locating the LZ Keep all bystanders 100' away form the LZ Keep everyone away from the tail rotor Contact pilot after landing to determine any safety issues Helicopter Safety !to 1i tap _J HighPoint RESOURCES Approach and depart the aircraft from the side only Never walk around the tail rotor Shield your eyes from rotorNash during landing and takeoff Do not carry anything above your head Do not approach the helicopter while the blades are turning unless instructed by the CareFlite crew Do not run towards the aircraft, approach in a calm and slow manner No smoking anywhere in the vicinity of the aircraft The pilot and/or medical crew control activity around the aircraft Secure loose items such as hats. clothing, stretcher sheets. and any other object light enough to be blown into the rotor blades APPENDIX F — Plan Review Log All Site personnel, with their signature below, acknowledge they have been briefed on the above Emergency Response Plan and are familiar with its provisions. They also acknowledge that they have received the appropriate safety training pertaining to their job functions. Name 'fide Orlaniiatiun Date Signature Fox Creek 26 SW Compressor Pad Noise Modeling Report October 31, 2019 Prepared for: HighPoint Resources 33105 WCR 33 Greeley, CO 80631 Prepared by: Behrens and Associates, Inc. 13806 Inglewood Avenue Hawthorne California, 90250 r3s/ii/ Carol Colby Acoustical Engineer Jason Peetz Engineering Manager Corporate Office: Hawthorne. California Carson. California - Aledo, Texas - Napa California - Longmont. Colorado - McDonald, Pennsylvania 800-679-8633 www.environmenial-noise-control.com www.drillingnoisccontrol.com Behrens and Associates, Inc. Environmental Noise Control 1. Introduction The following report provides a noise modeling assessment of the proposed Fox Creek 26 SW Compressor Pad operated by HighPoint Resources in relation to the commercial zone allowable noise limits found in Colorado Revised Statutes (CRS) 25-12-103 noise regulations per the Developmental Standards of the Use by Special Review (USR) permit application with Weld County. The noise modeling includes currently proposed mechanical equipment identified in the plan drawings dated 9/14/19. The Fox Creek 26 SW Compressor Pad Facility (40°58'44.31"N, 104°24'24.63"W) is located on Weld County Road 136 '/ approximately 4,400 feet west of County Road 71 in Weld County, Colorado. Figure 1-1 identifies the pad location. To assess the predicted noise levels of the proposed operations, manufacturer sound level data of proposed equipment was used when available. File sound level data previously measured and typical of the equipment was used when manufacturer sound level performance data was not available. The equipment sound level data was used to construct a noise model using SoundPLAN 8.0 software. The following is provided in this report: • A brief introduction of the fundamentals of noise. • A review of the applicable CRS 25-12-103 noise standards and US R noise limits. • Discussion of noise modeling methodology and results. • An assessment of the predicted noise modeling results Figure 1-1 Compressor Station Location Introduction 1 Behrens and Associates, Inc. Environmental Noise Control 2. Noise Fundamentals Sound is most commonly experienced by people as pressure waves passing through air. These rapid fluctuations in air pressure are processed by the human auditory system to produce the sensation of sound. The rate at which sound pressure changes occur is called the frequency. Frequency is usually measured as the number of oscillations per second or Hertz (Hz). Frequencies that can be heard by a healthy human ear range from approximately 20 Hz to 20,000 Hz. Toward the lower end of this range are low-pitched sounds, including those that might be described as a "rumble" or "boom". At the higher end of the range are high-pitched sounds that might be described as a "screech" or "hiss". Environmental noise generally derives, in part, from a combination of distant noise sources. Such sources may include common experiences such as distant traffic, wind in trees, and distant industrial or farming activities. These distant sources create a low-level "background noise" in which no particular individual source is identifiable. Background noise is often relatively constant from moment to moment but varies slowly from hour to hour as natural forces change or as human activity follows its daily cycle. Superimposed on this low-level, slowly varying background noise is a succession of identifiable noisy events of relatively brief duration. These events may include the passing of single -vehicles, aircraft flyovers, screeching of brakes, and other short-term events. The presence of these short-term events causes the noise level to fluctuate. Typical indoor and outdoor A -weighted sound levels are shown in Figure 2-1. ut COMMON OUTDOOR SOUND LEVELS .:. '1� 1. B-747-200 Takeoff at 2 mi. Gas Lawn Mower at 3 ft. Diesel Truck at 150 ft. DC -9-30 Takeoff at 2 mi. Noisy Urban Daytime B-757 Takeoff at 2 mi. Commercial Area Quiet Urban Daytime Quiet Urban Nighttime Quiet Suburban Nighttime Quiet Rural Nighttime D NOISE LEVEL COMMON INDOOR dB (A) SOUND LEVELS 110 Rock Band 100 Inside Subway Train (New York) 90 Food Blender at 3 ft. 80 Garbage Disposal at 3 ft. Shouting at 3 ft. 70 Vacuum Cleaner at 10 ft. Normal Speec 60 at 3 ft. 50 40 30 20 10 Large Business Office Dishwasher Next Room Small Theatre, Large Conference Room (Background) Library Bedroom at Nig t Concert Hall (Background Broadcast & Recording Studio 0 Threshold of Hearing Figure 2-1 Typical Indoor and Outdoor A -Weighted Sound Levels Noise Fundamentals 2 Behrens and Associates, Inc. Environmental Noise Control 3. CRS 25-12-103 Noise Standards The modeling analysis was developed to predict operational noise levels at adjacent properties and verify compliance of operations with the CRS 25-12-103 noise standards. The CRS code establishes permissible sound levels by type of property and hours of the day. The measurement location is defined in Section 25-12-103(1) as "Sound levels of noise radiating from a property line at a distance of twenty-five feet or more therefrom in excess of the dB(A) established for the following time periods and zones shall constitute prima facie evidence that such noise is a public nuisance." With regards to the applicable zoning noise limits for the proposed Fox Creek 26 SW Compressor Pad, Note 18 of the USR Permit — Development Standards provided on Sheet C002 of the Use by Special Review Submittal Plans for the HighPoint Resources Fox Creek 26 SW Compressor Pad states "the facility shall adhere to the maximum permissible noise levels allowed in the Commercial Zone District, as delineated in Section 25-12-103 C.R.S". Based on the specifications of CRS 25-12-103 and the USR Permit Development Standards, the commercial noise level limits listed in Table 3-1 are applicable to the site and will be used to assess the noise impact of the site. Table 3-1. Colorado Noise Related Statues 25-12-103 (1) — Maximum Permissible Noise Levels Zone Maximum Noise (dBA) 7:00 am to next 7:00 pm Maximum Noise (dBA) 7:00 pm to next 7:00 am Residential 55 dBA 50 dBA Commercial 60 dBA 55 dBA Light Industrial 70 dBA 65 dBA Industrial 80 dBA 75 dBA CRS 25-12-103 Noise Standards Behrens and Associates, Inc. Environmental Noise Control 4. Fox Creek 26 SW Compressor Pad Facility Noise Modeling 4.1 Noise Modeling Methodology The noise modeling was completed with use of three-dimensional computer noise modeling software. All models in this report were developed with SoundPLAN 8.0 software using the ISO 9613-2 standard. Noise levels are predicted based on the locations, noise levels and frequency spectra of the noise sources, and the geometry and reflective properties of the local terrain, buildings and barriers. SoundPLAN 8.0 software simulates light downwind conditions in all directions to ensure conservative assessments. The predicted noise levels represent only the contribution of the proposed compressor station operations and do not include ambient noise or noise from other facilities. Actual field sound level measurements may vary from the modeled noise levels due to other noise sources such as traffic, other facilities, other human activity, or environmental factors. The equipment sound level data used in the Fox Creek 26 SW Compressor Pad modeling was sourced from equipment manufacturer data, calculated data, and archived file data. If equipment specifications were not available or provided, data from similar or typical equipment was utilized. The modeling results predicted are dependent on equipment and mitigation orientation as indicated in this report. Figure 4-1 shows the Fox Creek 26 SW Compressor Pad plot plan and mechanical equipment layouts utilized in the study. Table 4-1 lists the equipment included in the modeling based on project designs current to the writing of this report. Table 4-1 Equipment Modeled for Fox Creek 26 SW Compressor Pad Quantity Equipment Type Proposed Equipment Data Source Source Sound Power Level (Lw dBA) 3 3 3 3 4 Compressor Engine Compressor Engine Exhaust Cooler Fan Intake Cooler Fan Discharge VRU Waukesha 7044GSI S5 Waukesha 7044GSI with 900H Series Hospital Grade Silencer (Appendix B) AXH 132FF2 AXH 132FF2 Quincy QR-5120 Manufacturer Data Manufacturer Data Manufacturer Data Calculated Data Manufacturer Data 102.7 71.1 100.6 90.6 98.5 4.2 Noise Sensitive Receptors The noise sensitive receptors have been chosen to be consistent with the requirements of the CRS 25-12-103 noise standards and proposed property boundaries. The standards indicate that "sound levels of noise radiating from a property line at a distance of twenty-five feet or more therefrom in excess of the dB(A) established for the following time periods and zones shall constitute prima facie evidence that such noise is a public nuisance." As such, receptor locations were chosen at 25 feet from the proposed site boundary of the Fox Creek 26 SW Compressor Pad to represent potential regulatory measurement points should a complaint be made. Figure 4-2 shows the dBA noise sensitive receptor locations. Fox Creek 26 SW Compressor Pad Facility Noise Modeling 4 Behrens and Associates, Inc. Environmental Noise Control an • ....• a I -.N -. ..0 I I a Ca .. -. - 4. . 1 - - �.•- - - "E ' - - - t _ - - .•.�. - r-. ....- _ _ _ ..v 1• - r.LL I...... _ - PLL I....• . - - - -'. T . - ' fiLL r..-- • r- -ra . -t _ _ I-- -I6 . 1 - - - aL .- - _.- . t - ♦ _ I._ . I.- - a r.. - Ms • I,- - a r••I _ - ILL - - •- - 14.17 L d lit- - - '- - NM I. .r tP - - - - - K.! TIC -!I .+T I..il - _ . .r• R. . . .4- 1....•- r- ✓ i ` i —. - - R. it t .-.? - - ♦ L . ' XI • pt•w.. _ - .--f 'C.•.T - r•• Claw• - I - .-t.i'6..4. - r./.... - - RUE. -lt r . - Ric t I_ O - . t -u. I IN. In _ - RUE -IL I . . La I. F. CT - _ M- _ .•T- t . - - MA 1r■l I* 44 _ t - n -. r © CI 0J0J LDOp f_10D i .._, .,•- ._-1.J .ac.—•. .w • W+. T 12 t 4 •• .0 (/ ,1 ��// or-r.r«I. I. .I . . FDti r 4EEk 26 3. cOts‘ P(NOP Pa ''L)T PLAN Ins ..... t HI Olt •r .4 c r_A• t, r - . '.G[. »Wit ,1 NO11 M I'.r.. . .- -I I t r Ell- c .c "I • r -. • •— - 1'r- r 11 w _ at - igure 4-1 Fox Creek 26 SW Compressor Pad Plot Plan (Plot Date 9/14/19, Drawing # FC-26SW-PP-101 — REV. B) Fox Creek 26 SW Compressor Pad Facility Noise Modeling 5 Behrens and Associates, Inc. Environmental Noise Control Receptor 5 Figure 4-2 Noise Sensitive Receptor Locations (dBA) dBA Compliance Assessment Locations Fox Creek 26 SW Assessed Boundary Receptor 2 Fox Creek SW 26 Compressor Pad Fox Creek 26 SW Compressor Pad Facility Noise Modeling 6 Behrens and Associates, Inc. Environmental Noise Control 4.3 Noise Modeling Results N _ A noise model was created to represent the site operations as described in Table 4-2. The results of the noise modeling are presented in Table 4-3. The locations in the tables correspond to the receptor locations identified in Figure 4-2. The results of the noise modeling are also shown as a noise contour map in Figure 4-4. The noise contours are provided in 5 dB increments with the color scale indicating the sound level of each contour. Table 4-2 Modeled Scenarios Modeled Scenario Description Unmitigated Scenario Compressor skids are modeled with 3 Waukesha 7044GSI S5 compressor engines enclosed in a sound transmission class (STC) rated building of approximately 32 per the building data provided by HighPoint and four Quincy QR-5120 VRUs. The Waukesha 7044GSI exhausts are modeled with a hospital grade series 900H silencer having an attenuation shown in Appendix B. All three compressor cooler fans are facing south Table 4-3 Noise Modeling Results (dBA) Receptor Location Description Unmitigated Scenario Location 1 North Boundary Location 2 East Boundary Location 3 Proposed South Boundary Location 4 Proposed Southwest Boundary Location 5 Proposed West Boundary 52.9 51.5 53.7 52.3 51.6 Allowable Noise 25 ft. from the property line of potential noise Level complainant. 60.0 Day / 55.0 Night The numerical and graphical noise modeling results for the unmitigated scenario indicate that the proposed operations of the Fox Creek 26 SW Compressor Pad are predicted to comply with the commercial CRS noise limits at all the receptors. Fox Creek 26 SW Compressor Pad Facility Noise Modeling 7 Behrens and Associates, Inc. Environmental Noise Control I. - - _.l I r 1 r 1 Tr U - I l - I 1 .T.1 [.T ICI - iF- n- H iF 11 i � _ I R ! I F . C .CC.. J L J r' L ■u _ _ _.�� oo■ - I i tot I F cot { Ut i� 11 in Figure 4-3 Modeled Equipment Layout (Plot Date 9/14/19, Drawing # FC-26SW-PP-101) Fox Creek 26 SW Compressor Pad Facility Noise Modeling 8 Figure 4-4 Unmitigated Scenario Noise Contour Map (dBA) Behrens and Associates, Inc. Environmental Noise Control Noise Level, dBA = 30.0 = 35.0 = 40.0 = 45.0 = 50.0 = 55.0 = 60.0 = 65.0 = 70.0 = 75.0 = 80.0 = 85.0 = 90.0 250 500 750 feet Fox Creek 26 SW Compressor Pad Facility Noise Modeling 9 Behrens and Associates. Inc. Environmental Noise Control 5. Conclusion N _ Predictive noise models were created to represent the proposed operations at the proposed Fox Creek 26 SW Compressor Pad operated by HighPoint Resources. Noise sensitive receptor locations included in the models were placed in compliance with the noise standards of CRS 25-12-103 and Fox Creek 26 SW Compressor Pad USR Development Standards and the proposed boundaries suggested by HighPoint Resources. The numerical and graphical noise modeling results for the unmitigated scenario indicate that the proposed operations of the Fox Creek 26 SW Compressor Pad are predicted to comply the commercial CRS noise limits at the proposed site boundaries supplied by Highpoint Resources. Conclusion 10 Behrens and Associates. Inc. Environmental Noise Control Appendix A Glossary of Acoustical Terms Glossary of Acoustical Terms 11 Behrens and Associates, Inc. Environmental Noise Control Ambient Noise The all -encompassing noise associated with a given environment at a specified time, usually a composite of sound from many sources both near and far. Average Sound Level See Equivalent -Continuous Sound Level A -Weighted Decibel Scale The human ear is more sensitive to some sound frequencies than others. It is therefore common practice to apply a filter to measured sound levels to approximate the frequency sensitivity of the human ear. One such filter is called the A -weighted decibel scale which emphasizes sounds between 1,000 and 5,000 Hertz by discounting the frequencies outside of this range. As the human ear is less sensitive to low frequency noise, the A -weighted decibel scale begins to increasingly discount noise below 500 Hertz. Measurements conducted utilizing the A -weighted decibel scale are denoted with an "(A)" or "A" after the decibel abbreviation (dB(A) or dBA). The A -weighted scale is nearly universally used when assessing noise impact on humans. C -Weighted Decibel Scale High level low frequency noise can propagate large distances from its source. Although not always audible, high levels of low frequency noise can induce vibrations in objects or structures which could become evident in ways that might be annoying to humans (e.g., rattling of windows). The C -weighted decibel scale, which was developed to estimate human ear sensitivity to high noise levels, is a flatter filter that does not discount low frequency noise as much as the A -weighted decibel scale. As a result, a C -weighted decibel measurement could be significantly higher than an A -weighted decibel measurement if the noise being measured contains a heavy low frequency content. Measurements conducted utilizing the C -weighted decibel scale are denoted with an "(C)" or "C" after the decibel abbreviation (dB(C) or dBC). C -weighted noise level limits are sometimes included in noise regulations as a way to address low frequency environmental noise issues. Community Noise Equivalent Level (CNEL) A 24 -hour A -weighted average sound level which takes into account the fact that a given level of noise may be more or less tolerable depending on when it occurs. The CNEL measure of noise exposure weights average hourly noise levels by 5 dB for the evening hours (between 7:00 pm and 10:00 pm), and 10 dB between 10:00 pm and 7:00 am, then combines the results with the daytime levels to produce the final CNEL value. It is measured in decibels, dbs. Day -Night Average Sound Level (Ldn) A measure of noise exposure level that is similar to CNEL except that there is no weighting applied to the evening hours of 7:00 pm to 10:00 pm. It is measured in decibels, dB. Glossary of Acoustical Terms 12 Behrens and Associates, Inc. Environmental Noise Control Daytime Average Sound Level The time -averaged A -weighted sound level measured between the hours of 7:00 am to 7:00 pm. It is measured in decibels, dB. Decay Rate The time taken for the sound pressure level at a given frequency to decrease in a room. It is measured in decibels per second, dB/s. Decibel (dB) The basic unit of measurement for sound level. Direct Sound Sound that reaches a given location in a direct line from the source without any reflections. Divergence The spreading of sound waves from a source in a free field, resulting in a reduction in sound pressure level with increasing distance from the source. Energy Basis This refers to the procedure of summing or averaging sound pressure levels on the basis of their squared pressures. This method involves the conversion of decibels to pressures, then performing the necessary arithmetic calculations, and finally changing the pressure back to decibels. Equivalent -Continuous Sound Level (Leq) The average sound level measured over a specified time period. It is a single -number measure of time - varying noise over a specified time period. It is the level of a steady sound that, in a stated time period and at a stated location, has the same A -Weighted sound energy as the time -varying sound. For example, a person who experiences an Leq of 60 dB(A) for a period of 10 minutes standing next to a busy street is exposed to the same amount of sound energy as if he had experienced a constant noise level of 60 dB(A) for 10 minutes rather than the time -varying traffic noise level. It is measured in decibels, dB. Fast Response A setting on the sound level meter that determines how sound levels are averaged over time. A fast sound level is always more strongly influenced by recent sounds, and less influenced by sounds occurring in the distant past, than the corresponding slow sound level. For the same non -steady sound, the maximum fast sound level is generally greater than the corresponding maximum slow sound level. Fast response is typically used to measure impact sound levels. Field Impact Insulation Class (FIIC) A single number rating similar to the impact insulation class except that the impact sound pressure levels are measured in the field. Glossary of Acoustical Terms 13 Behrens and Associates, Inc. Environmental Noise Control Field Sound Transmission Class (FSTC) A single number rating similar to sound transmission class except that the transmission loss values used to derive this class are measured in the field. Flanking Sound Transmission The transmission of sound from a room in which a source is located to an adjacent receiving room by paths other than through the common partition. Also, the diffraction of noise around the ends of a barrier. Frequency The number of oscillations per second of a sound wave Hourly Average Sound Level (HNL) The equivalent -continuous sound level, Leq, over a 1 -hour period. Impact Insulation Class (IIC) A single number rating used to compare the effectiveness of floor/ceiling assemblies in providing reduction of impact -generated sound such as the sound of a person's walking across the upstairs floor. Impact Noise The noise that results when two objects collide. Impulse Noise Noise of a transient nature due to the sudden impulse of pressure like that created by a gunshot or balloon bursting. Insertion Loss The decrease in sound power level measured at the location of the receiver when an element (e.g., a noise barrier) is inserted in the transmission path between the sound source and the receiver. Inverse Square Law A rule by which the sound intensity varies inversely with the square of the distance from the source. This results in a 6dB decrease in sound pressure level for each doubling of distance from the source. Ln Percentile Sound Level The noise level exceeded for n% of the measurement period where n is between 0.01 % and 99.99%. Usually includes a descriptor i.e. A -weighting. Common Ln values include LA 10, LA50, and LA90 levels. LA 10 would represent the A -weighted sound level that is exceeded for 10% of the measurement period. Masking The process by which the threshold of hearing for one sound is raised by the presence of another sound. Maximum Sound Level (Lmax) The greatest sound level measured on a sound level meter during a designated time interval or event. Glossary of Acoustical Terms 14 Behrens and Associates. Inc. Environmental Noise Control NC Curves (Noise Criterion Curves) A system for rating the noisiness of an occupied indoor space. An actual octave -band spectrum is compared with a set of standard NC curves to determine the NC level of the space. Noise Isolation Class (NIC) A single number rating derived from the measured values of noise reduction between two enclosed spaces that are connected by one or more partitions. Unlike STC or NNIC, this rating is not adjusted or normalized to a measured or standard reverberation time. Noise Reduction The difference in sound pressure level between any two points. Noise Reduction Coefficient (NRC) A single number rating of the sound absorption properties of a material. It is the average of the sound absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest multiple of 0.05. Normalized Noise Isolation Class (NNIC) A single number rating similar to the noise isolation class except that the measured noise reduction values are normalized to a reverberation time of 0.5 seconds. Octave The frequency interval between two sounds whose frequency ratio is 2. For example, the frequency interval between 500 Hz and 1,000 Hz is one octave. Octave -Band Sound Level For an octave frequency band, the sound pressure level of the sound contained within that band. One -Third Octave The frequency interval between two sounds whose frequency ratio is 2^(1/3). For example, the frequency interval between 200 Hz and 250 Hz is one-third octave. One -Third -Octave -Band Sound Level For a one -third -octave frequency band, the sound pressure level of the sound contained within that band. Outdoor -Indoor Transmission Class (OITC) A single number rating used to compare the sound insulation properties of building fa�ade elements. This rating is designed to correlate with subjective impressions of the ability of fa�ade elements to reduce the overall loudness of ground and air transportation noise. Peak Sound Level (Lpk) The maximum instantaneous sound level during a stated time period or event. Glossary of Acoustical Terms 15 Behrens and Associates, Inc. Environmental Noise Control Pink Noise Noise that has approximately equal intensities at each octave or one -third -octave band. Point Source A source that radiates sound as if from a single point. RC Curves (Room Criterion Curves) A system for rating the noisiness of an occupied indoor space. An actual octave -band spectrum is compared with a set of standard RC curves to determine the RC level of the space. Real -Time Analyzer (RTA) An instrument for the determination of a sound spectrum. Receiver A person (or persons) or equipment which is affected by noise. Reflected Sound Sound that persists in an enclosed space as a result of repeated reflections or scattering. It does not include sound that travels directly from the source without reflections. Reverberation The persistence of a sound in an enclosed or partially enclosed space after the source of the sound has stopped, due to the repeated reflection of the sound waves. Room Absorption The total absorption within a room due to all objects, surfaces and air absorption within the room. It is measured in Sabins or metric Sabins. Slow Response A setting on the sound level meter that determines how measured sound levels are averaged over time. A slow sound level is more influenced by sounds occurring in the distant past that the corresponding fast sound level. Sound A physical disturbance in a medium (e.g., air) that is capable of being detected by the human ear. Sound Absorption Coefficient A measure of the sound -absorptive property of a material. Sound Insulation The capacity of a structure or element to prevent sound from reaching a receiver room either by absorption or reflection. Glossary of Acoustical Terms 16 Behrens and Associates, Inc. Environmental Noise Control Sound Level Meter (SLM) An instrument used for the measurement of sound level, with a standard frequency -weighting and standard exponentially weighted time averaging. Sound Power Level A physical measure of the amount of power a sound source radiates into the surrounding air. It is measured in decibels. Sound Pressure Level A physical measure of the magnitude of a sound. It is related to the sound's energy. The terms sound pressure level and sound level are often used interchangeably. Sound Transmission Class (STC) A single number rating used to compare the sound insulation properties of walls, floors, ceilings, windows, or doors. This rating is designed to correlate with subjective impressions of the ability of building elements to reduce the overall loudness of speech, radio, television, and similar noise sources in offices and buildings. Source Room A room that contains a noise source or sources Spectrum The spectrum of a sound wave is a description of its resolution into components, each of different frequency and usually different amplitude. Tapping Machine A device used in rating different floor constructions against impacts. It produces a series of impacts on the floor under test, 10 times per second. Tone A sound with a distinct pitch Transmission Loss (TL) A property of a material or structure describing its ability to reduce the transmission of sound at a particular frequency from one space to another. The higher the TL value the more effective the material or structure is in reducing sound between two spaces. It is measured in decibels. White Noise Noise that has approximately equal intensities at all frequencies. Windscreen A porous covering for a microphone, designed to reduce the noise generated by the passage of wind over the microphone. Glossary of Acoustical Terms 17 Behrens and Associates, Inc. Environmental Noise Control Appendix B Exhaust Silencer Attenuation Exhaust Silencer Attenuation 18 Behrens and Associates, Inc. Environmental Noise Control Table of Typical Maxim Exhaust Silencer Insertion Loss Values (dB 31Hz 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz Insertion Loss 21 30 42 44 40 39 36 35 32 TYPICAL ATTENUATION CURVE 900H SERIES SILENCER OCTAVE BAND J W CO U W O3 in O Z O p a W 2 V_ 2:41 O O 4) cc 50 40 30 20 10 0 63 125 250 500 1000 2000 4000 8000 CENTER FREQUENCY, Hz Exhaust Silencer Attenuation 19 Hello