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(it-,-,,,..- MEMORANDUM
TO: Lin Dodge, Planning Services DATE: October 4, 2010
FROM: Clay Kimmi, P.E., CFM"ilk
COLORADO SUBJECT: USR-1747, Conquest C7 Injection Facility Grading Permit
Public Works received a set of updated drawings from the Planning Department on September 29, 2010 for review. The
drawings were stamped, signed, and dated by Paul Sorenson, P.E. #23679.
The grading plan and sediment and erosion control plan appear to be acceptable to Public Works. Once the final plat
has be submitted for recording and the improvements agreement/collateral has been accepted by the BOCC,the
grading permit can be released.
Original & Email: Lin Dodge, Planning Services Ward County Planning Department
pc: USR-1747 GREELEY OFFICE
cc: Kim Ogle, Planning Services
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M:\PLANNING—DEVELOPMENT REVIEW\USR-Use by Special Review\USR-1747 Conquest C-7 Site\USR-1747 Grading Permit 10-4-10.DOC
cGtENVIRONMENTAL SEW1CL., ft ke � i , [ �
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August 24, 2010
IMr. David Bauer, PE, CFM ' �� r-% - /
Weld County Engineer
I PO Box 758
Greeley, CO 80631 ° - Y PUBLIC WORKS WEPT
Subject: Letter of Variance
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Conquest C7 Produced Water Treatment Facility
Weld County USR-1747
Final Drainage Report
I Proposed Retention Facility
CGRS Project No. 1-8019-12439aa
IDear Mr. Bauer:
On behalf of Conquest Oil Company, CGRS, Inc. (CGRS) is submitting with this letter a Use By Special
I Review Permit Application for the above-referenced proposed Conquest C7 Produced Water Treatment
Facility. The Site Plan Review and the Preliminary Drainage Report were revised in accordance with
review comments by Mr. Clay Kimmi,Weld County Department of Public Works. Because of site
I constraints, Mr. Kimmi agreed that a retention facility at this location represents the most practicable Best
Management Practice (BMP), and accordingly would be acceptable for this location.
The applicant(Conquest Oil Company) understands that the Weld County Code generally requires the
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installation of a detention pond for water quality control and for off-site discharge control in order to
minimize impacts associated with any development within Weld County. The Applicant and the
Applicant's engineer understand that this variance request is not precedent setting, and requests this
Ivariance to allow a retention facility for this site for the following reasons:
• The very flat grade at this site renders the installation of a detention pond with a water quality
I outlet unfeasible because such an outlet would be below existing grade and below the down-
gradient culvert which conveys runoff to the downstream receiving water, Crow Creek;
• The very flat ground at this location would require an outlet channel with a maximum flow depth of
I 0.25 feet, requiring an excessively wide channel of over 60 feet;
• The sandy, very permeable soils at this site facilitate rapid drainage allowing complete drainage
from the retention pond of the 100-year 1-hour precipitation event runoff within a 72-hour period;
I and
• The retention facility as proposed is designed to reduce impacts of the development on
neighboring downstream properties by reducing storm water flows from the development.
IRetention facilities in Weld County are generally sized to retain 1.5 times the runoff volume modeled by
the 100-year 24-hour precipitation event with 1 foot of freeboard. However, in accordance with a verbal
agreement with Mr. Clay Kimmi, 1.5 times the 100-year 1-hour design storm formed the basis for sizing
Ithe retention facility. The applicant understands that the use of the 100-year, 1-hour event is not
' P.O. Box 1489 Fort Collins, CO 80522 T 800-288-2657 F 970-493-7986 www.cgrs.com
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precedent setting, and will not be utilized again on other sites. The 1-foot freeboard that is provided is an
excessively large area due to the incorporation of an existing natural closed basin defined by the 1-foot
' freeboard contour, as shown on the Site Plan attached to the Preliminary Drainage Report. Weld County
criteria require that a minimum retention pond bottom be size to accomplish on complete drainage of the
facility within a 72-hour period. Calculations presented in the Preliminary Drainage Report show that the
' retention pond as designed provides a much larger bottom area and a corresponding much more rapid
drainage that the maximum allowed 72-hour period.
' The conceptual drainage design as described in this Drainage Report was prepared by me in accordance
with provisions of the Weld County storm drainage criteria for Conquest Oil Company and presents all
hydrologic and hydraulic calculations and corresponding assumptions used to develop an effective
drainage plan for this site.
Please do not hesitate to contact me directly if you have any questions or require additional information
' regarding this conceptual drainage design.
Sincerely,
CGRS, Inc.
' Paul Sorensen, P.E.
Project Manager/Engineer
ec: Mr. Jim Goddard, Conquest Oil Company
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CJSGENVIRONMENTAL SE a`•OC
August 24, 2010
' Mr. Kim Ogle
Weld County Department of Planning Services
North Weld Building
918 101h Street
Greeley, CO 80631
Subject: Conquest C7 Produced Water Treatment Facility
Use by Special Review Permit Application
Weld County USR-1747
Site Plan Review
Final Drainage Report
CGRS Project No. 1-8019-12439aa
fDear Mr. Ogle:
On behalf of Conquest Oil Company, CGRS, Inc. (CGRS) is pleased to submit for your review the above-
referenced revised Site Plan Review and Final Drainage Report for the proposed Conquest C7 Produced
Water Treatment Facility. The Site Plan Review and the Final Drainage Report have been prepared in
' accordance with your comments of April 23, 2010, subsequent comments by Mr. Clay Kimmi, and on
Preliminary Drainage Report Comments of June 28, 2010. The conceptual drainage design as described
in this Drainage Report was prepared by Mr. Paul Sorensen, P.E. in accordance with provisions of the
Weld County storm drainage criteria for Conquest Oil Company and presents all hydrologic and hydraulic
calculations and corresponding assumptions used to develop an effective drainage plan for this site.
As shown in the attached report, Conquest Oil requests a variance from Weld County Drainage Criteria
for the approval of a retention facility at this location. This variance is requested as discussed with Mr.
Kimmi because site conditions do not allow for the installation of a conventional detention basin.
Justification for this request is thoroughly documented in the attached report.
' Please do not hesitate to contact me directly if you have any questions or require additional information
regarding this conceptual drainage design.
Sincerely,
CGRS Inc.
' Paul Sorensen, P.E.
Project Manager/Engineer
ec: Mr. Jim Goddard, Conquest Oil Company
P.O. Box 1489 Fort Collins, CO 80522 T 800-288-2657 F 970-493-7986 www.cgrs.com
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FINAL DRAINAGE REPORT
' CONQUEST OIL COMPANY
C-7 FACILITY
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IPrepared for:
Conquest Oil Company
I 8207 W. 20th St., Suite B
IGreeley, Colorado 80634
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IPrepared by:
CGRS, Inc.
I PO Box 1489
I Fort Collins, CO
I August 24, 2010
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FINAL DRAINAGE REPORT
1 CONQUEST C-7
PRODUCED WATER TREATMENT FACILITY
I hereby certify that this report for the conceptual drainage design of the Conquest C7 Facility
was prepared by me in accordance with the provisions of the Weld County storm drainage
criteria for the owners thereof.
O9 DREG%sl.
Paul C. Sorensen, P.E. :ap
Registered Professional Engineer eg •'A6.4
SOMA aEa
State of Colorado No.23679
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FINAL DRAINAGE REPORT
CONQUEST C-7
PRODUCED WATER TREATMENT FACILITY
WELD COUNTY USR-1747
I. General Location and Description
' A. Location
Conquest Oil Company proposes to construct and operate a Produced Water Treatment
Facility in Weld County. The proposed site is located in the Southeast '/ of the
Southeast %, Section 34, Township 7 North, Range 63 West. Weld County Road 74 is
' adjacent to the property on the south and Weld County Road 69 is adjacent to the
property on the east. Colorado Highway 392 is adjacent to the southeast corner of the
property, running diagonally across the southeast corner in a southwest to northeast
direction. Figure 1 is a General Vicinity Map of the Conquest C7 facility which identifies
the up-stream off-site drainage area flowing onto the proposed development and the
general drainage patterns. The nearest open water is Crow Creek, located
approximately 1,500-feet southeast of the property, flowing in a southwesterly direction.
Coal Creek, a minor intermittent tributary to Crow Creek, is approximately 1,500-feet
west of the property, flowing south under WCR 74 to Crow Creek. There are no other
major open channels, lakes, streams, irrigation or other water resource facilities within
or adjacent to the proposed project site. The surrounding ground is agricultural in
nature, and no other developments or municipalities are in the vicinity. Unincorporated
Cornish, Colorado is located east of the proposed project site, across WCR 69 and
Colorado State Highway 392.
B. Description of Property
The proposed project site is approximately 11.68 acres in size configured as shown on
the Site Plan, attached herewith inside the back cover. Native grasses cover the site,
and site soils consist of Sandy Loam soils, described as "well drained and somewhat
' excessively drained, moderately rapidly permeable soils on smooth to dissected plains
(Soil Survey of Weld County, Colorado, Northern Part, United States Department of
Agriculture Soil Conservation Service and Forest Service, August, 1982). A copy of the
SCS Map (Sheet No. 37, Soil Survey of Weld County, Colorado, Northern Part) and
corresponding soils information are included herein in Appendix A. The proposed site is
' very flat, sloping gently to the southeast at an average slope of approximately 0.2%.
There are no major open channels on the proposed project property.
The proposed project is generally described as a produced wastewater treatment facility
that will receive produced water from oil and gas well production facilities in Weld
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 2
County for treatment and disposal. Produced water will be delivered to the facility by
truck where the produced water will be collected from the truck and processed in the
treatment facility. Following treatment to required discharge levels, the treatment
process effluent will be disposed of by deep well injection at an injection well to be
Ilocated on the project site.
Ownership information for the subject property and for properties within 200 feet of the
property is provided on the Site Plan. The property is owned by Mr. Rodney Wilson
(Weld County Parcel No. 071334000004). There are no irrigation facilities on or within
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200 feet of the subject property.
Five (5) soil borings were advanced into the subsurface on March 18, 2010 to describe
Iboth soils and groundwater characteristics at the property. Boring locations are
depicted on the Plot Plan provided with the USR Permit Application. As shown in the
boring logs (Appendix B), the soils are generally described as fine to very fine grained
sandy silt overlying fine to medium grained sand at depths of 8 to 10 feet below ground
surface (bgs). Groundwater was encountered in the borings at depths ranging from
I 17.8 feet to 19.5 feet bgs. Soil and groundwater quality samples were collected from
borings TH-3, TH-4, and TH-5 and delivered to Technology Laboratory, Inc. in Fort
Collins, Colorado for analysis. The soil samples were analyzed for benzene, toluene,
ethylbenzene, total xylenes (BTEX), gasoline range organics (GRO — also referred to as
Total Volatile Petroleum Hydrocarbons or TVPH), and diesel range organics (DRO —
I also referred to as Total Extractable Petroleum Hydrocarbons or TEPH). Groundwater
quality samples were analyzed for BTEX. Analytical results show non-detectable levels
for the soil samples for all constituents sampled. Analytical results for the water
I samples show a total xylenes concentration in the sample fromTH-3 of 0.002 mg/L
(method detection level is 0.001 mg/L); all other constituents are documented at less
than detection levels. Tables 1 and 2 present Soil Analytical Data and Groundwater
Analytical Data, respectively. Furthermore, geotechnical soil samples were obtained
from soil borings TH-1 through TH-3 to provide geotechnical information necessary for
I facility engineering/design. The Geotechnical Report documenting subsurface
conditions is included with the USR submittal.
II. Drainage Basins and Sub-Basins
A. Major Basin Description
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 3
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There is no Weld County Master Drainage Plan for this area. A database search for
I FEMA Flood Insurance Rate Maps (FIRM) in Weld County identified an unpublished
FIRM Map Panel (08026600525c) which covers the subject property area. This is an
unpublished map panel because there is no floodplain in this area.
ISurface topography on and around the subject property is extremely flat, gently sloping
I to the southeast at an approximate slope of 0.2%. The Site Plan provides on-site
contours at 1-foot vertical intervals, and shows both existing contours and proposed
contours as required to accomplish adequate site drainage, including the on-site storm
I water retention facility. The applicant understands that Weld County does not generally
approve retention facilities (as opposed to a Detention Basin). However, because this
site is extremely flat, has very well-drained soils, and because the elevation drop does
Inot allow for a conventional detention facility, the applicant requests a variance for the
approval of a retention facility. Major drainage basin characteristics are summarized in
IAppendix C, Hydrologic Computations.
B. Sub-Basin Description
I The subject property and adjacent properties historically drain to the south/southeast to
Crow Creek located approximately 1,500 feet southeast of the property. Crow Creek
flows in a southwesterly direction. The subject property slopes gently to a 15-inch
Idiameter culvert in the southeast corner of the property under Weld County Road 69,
and thence across the abandoned Union Pacific Railroad right of way to a 24-inch
diameter culvert under Colorado State Highway 392, discharging to Crow Creek
approximately 1,500 feet to the southeast. Crow Creek flows to its confluence with the
South Platte River approximately 10 miles to the southwest.
Off-site drainage flow patterns include Coal Creek, an intermittent tributary to Crow
Creek located approximately 1,500 feet west of the property that flows to the southwest.
IThere is a slightly-defined drainage divide approximately 350 feet west of the subject
property between Coal Creek and the subject property. Drainage from the subject
property and the ground directly to the west is generally to the east, split to the
southeast or northeast, ultimately flowing to the aforementioned 15-inch diameter
culvert under WCR 69. A 15-inch diameter CMP culvert is proposed at the facility entry
I driveway to convey runoff from the west to the aforementioned 15-inch culvert under
WCR 69.
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 4
As indicated above, the overall site is very flat and generally produces correspondingly
' slow runoff patterns. This flat slope coupled with permeable soils, generally consisting
of "8 to 10-feet of silty sand over slightly silty to gravelly sands to the depths explored
(CTL Thompson, Geotechnical Investigation, Conquest Oil C7T, April 1, 2010)," result in
' minimal runoff production in response to most precipitation events. The drainage
design herein described provides a retention facility in the southeast portion of the
subject property that is sized to retain runoff from the developed site produced by the
1 100-year, 1-hour precipitation event, as modeled by the Urban Drainage and Flood
Control District (UDFCD) Colorado Urban Hydrograph Procedure (CUHP), Version
1 1.3.3. Because of the extremely flat site, and in accordance with a verbal agreement
with Mr. Clay Kimmi of the Weld County Public Works Department (telephone
conversation, June 2, 2010), a retention facility with no outlet works is proposed that is
sized to retain 1.5 times the runoff volume produced by the 100-year 1-hour
precipitation event, plus 1-foot of freeboard. The Applicant understands and agrees that
use of this methodology is not precedent setting and is use for this site condition only.
CUHP parameters are presented in the Appendix C, Hydrologic Computations.
Retention facility design details are discussed below and summarized in the Appendix
' D, Hydraulic Computations.
III. Drainage Design Criteria
A. Development Criteria Reference and Constraints
As stated above, the Weld County Master Drainage Plan does not encompass the
subject property or adjacent properties. No other previous drainage study of the subject
property has been completed. Accordingly, the proposed drainage design will not be
influenced nor will it have an influence on previous drainage studies for the area.
Existing site constraints of very flat sloping ground influence the drainage design by the
requirement of importing a modest amount of fill material in order to establish positive
drainage of the site to the aforementioned 15-inch culvert in the southeast corner of the
property. No streets, utilities, existing structures, or irrigation ditches are present on-site
or in the immediate area that would pose constraints on the proposed drainage plan.
I B. Hydrologic Criteria
An on-site storm water retention facility is proposed based on the UDFCD CUHP model.
Weld County Drainage Criteria indicate that a retention facility must be sized to retain
runoff volume produced by the 100-year 24-hour precipitation event. However, Mr. Clay
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 5
IKimmi of the Weld County Public Works Department, indicated that the retention facility
for this project may be sized to contain the runoff volume produced by the 100-year, 1-
hour precipitation event falling on the developed site as modeled by the UDFCD CUHP
model, plus 1-foot of freeboard (telephone conversation with Mr. Kimmi, June 2, 2010).
I The Applicant once again reiterates that this methodology is not intended to be
precedent setting, and is being used for this site only. The retention facility does not
I include an outlet channel; rather it is designed to drain the total runoff volume within a
72-hour period — readily accomplished due to the very permeable nature of soils in this
area. Due to limited grade availability for a spillway, no pond berm or corresponding
I spillway are proposed for this facility (hydraulically, such a spillway would be at a higher
elevation than there is available elevation on this site). Rather, because there is no
retention pond berm, the retention pond is to be constructed by on-site excavation
I which may be more generally equated to an increase in basin depression storage. If
the pond (depression storage) should overtop, the affect would be simply an increase in
I pond surface area that would encompass the subject property (below the elevated
grade for the Conquest facility) and not overtop the adjacent roadways. The UDFCD
CUHP model printouts are provided in Appendix C, Hydrologic Computations. UDFCD
spreadsheets and other calculations provided in Appendix C include the following:
• Map of Colorado Hydrologic Zones showing the project site to be in Hydrologic
IZone 1;
• Intensity-Duration-Frequency (IDF) Table for Zone One in the State of Colorado;
• Calculations for sizing the retention facility inlet channel based on the UDFCF
CUHP model for the historic 100-year 1-hour precipitation event for undeveloped
drainage basin (167 acre drainage basin); and
I • Calculation of the Runoff Volume (retention facility required capacity) based on
the UDFCD CUHP model for the 100-year, 1-hour precipitation event falling on
Ithe developed site (11.68 acre site).
Rainfall data given on NOAA Atlas 2, Volume III for the 6-hour and 24-hour precipitation
events with 2-year, 5-year, 10-year, 25-year, 50-year, and 100-year return period were
entered on the UDFCD IDF Table for Zone One in the State of Colorado in order to
develop the1-hour storm rainfall depth. Corresponding copies of the NOAA Atlas 2
maps are provided in Appendix C. The UDFCD IDF Table is provided in Appendix C
showing the 5-year and 100-year, 1-hour events rainfall depths of 1.49-inches and 2.86-
inches, respectively. Hydrologic data used in the UDFCD models are based on a
drainage basin area of 11.68 acres and 27% impervious ground for post-development
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 6
' conditions and a drainage basin of 167 acres assuming 0% impervious ground for the
current (historical) conditions. Existing soils in this drainage basin are Hydrologic Soil
Type B, and the corresponding initial infiltration rate, final infiltration rate and Horton
decay coefficient of 4.5 inches/hour, 0.6 inches/hour, and 0.0018 1/sec are assumed,
respectively.
' The CUHP model for the 100-year, 1-hour precipitation event for the developed site
(11.68 acre) shows a peak runoff volume of 83,288 cubic feet (cf). In accordance with
Weld County requirements, the retention facility is designed to retain the total runoff
volume of not less than 1.5 times that produced by the 100-year, 1-hour precipitation
event, or a total of 124,932 cf.
Due to the extreme flat nature of the proposed project site, improvements associated
with the Conquest facility will be slightly elevated with imported fill material to an
elevation of 4714 feet. As shown on the Site Drainage Plan (inside back cover), the
existing roadway elevation on the south side of the facility (WCR 74) is approximately
4717 feet, with the grade along the southeast and east sides (WCR 69) at
approximately 4716 feet. The up-gradient basin remains at an elevation of 4714 feet or
less for the extent of the site survey completed for this project. Accordingly, ponding in
response to large precipitation events will extend to the north and west of the site and
not overtop the adjacent county roadways.
C. Hydraulic Criteria
On-site runoff to the proposed retention facility is via sheet flow, and as such no specific
channel or ditch exists to deliver surface runoff to the retention facility. Retention facility
' requirements of Weld County are that it must retain 1.5 times the total runoff volume
produced by the 100-year 24-hour precipitation event. During a June 2, 2010 telephone
conversation with Mr. Clay Kimmi, it was agreed that the retention pond for this facility
only may be sized based on 1.5 times the total runoff produced by the 100-year 1-hour
precipitation event (non-precedent setting assumption). The inlet channel to the
retention facility must be sized to pass the runoff produced by the historic drainage
basin (167 acres) for the 100-year 1-hour precipitation event. A trapezoidal inlet
channel is proposed for the corresponding peak runoff rate of 150 cubic feet per second
(cfs). The resulting inlet channel is designed with a 47-foot base width, a channel
bottom slope of 0.004 ft/ft, and 4:1 side slopes. The required 1-foot of freeboard is
provided by lowering the channel bottom by 1-foot, as shown on the Site Drainage Plan.
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Conquest Oil C7 Site
Final Drainage Report
August 24, 2010
Page 7
The inlet channel provides added runoff storage capacity in addition to that provided by
' the excavated retention basin. Design calculations are provided in Appendix D.
IV. Drainage Facility Design
' A. General Concept
The subject property is divided roughly in half, with the western (topographically higher)
portion to contain the Conquest C7 project development, and the eastern half to remain
open and contain the retention facility. Structural fill material will be imported to the site
in order to slightly elevate the Conquest facility entry driveway off of WCR 74, facility
buildings, associated other structures, and to facilitate site drainage on this very flat
property.
A retention facility capacity of 129,383 cubic feet is proposed as required to retain runoff
from the 100-year 1-hour event (exceeding the required volume of 124,932 cf). Design
calculations and the area-capacity table are presented in Appendix D. Construction of
the retention facility will require site excavation/earthwork to provide the required
capacity. Minor site grading will be accomplished to facilitate site drainage to the
retention facility, including up-gradient runoff onto the property. The property will drain
' to the on-site retention facility and into the subsurface through the porous soils that exist
at this location. The entire runoff volume from the design storm will percolate out within
the required 72-hour time period. In fact, based on the measured percolation rate of
25.5 minutes per inch (High Plains Engineering and Design, March, 2010), a minimum
bottom area of the retention facility of 5,253 square feet would provide for total drainage
' of design runoff volume in a 72-hour period. The retention facility as designed provides
a bottom area of 15,625 square feet, nearly three times the required minimum bottom
area, providing a very conservative design for this facility, and one that will accomplish
' total facility drainage well within the 72-hour time period criteria. The site will be
revegetated as discussed below to provide long-term erosion control that will serve to
maintain existing permeability of the soils present there. Until vegetation is re-
established, sediment accumulation in the inlet channel and retention pond and the
corresponding impact of reduced infiltration rates will be controlled through the
implementation of erosion and sediment control best management practices as
discussed below. There are no known off-site runoff considerations and constraints with
respect to this project.
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Conquest Oil C7 Site
1 Final Drainage Report
August 24, 2010
Page 8
1 The applicant understands that Weld County generally does not approved retention
1 facilities. However, due to site conditions as described herein, the applicant requests a
variance from the Weld County Storm Drainage Criteria for the approval of the retention
facility at the Conquest C7 site.
1 B. Specific Details
1 Design storms used for this drainage plan analysis are based on NOAA Atlas 2, Volume
III Isopluvials of the 2-Yr, 5-Yr, 10-Yr, 25-Yr, 50-Yr, and 100-Yr 6-Hr and 24-Hr
precipitation events. Runoff peak rate and total runoff volume were modeled by the
1 Urban Drainage and Flood Control District (UDFCD) Colorado Urban Hydrograph
Procedure (CUHP). The peak runoff flow rate was estimated based on the 100-yr, 1-hr
event for the historic drainage basin (167 acres), and the retention facility required
1 volume was estimated based on the 100-yr, 1-hr event for the proposed drainage basin
(11.68 acres). As previously stated, the applicant understands and confirms that the
1 use of the 100-year 1-hour event will be limited to this site only and is not intended to be
a precedent-setting approach to site design.
1 Extremely flat sites of this nature present design challenges that can limit drainage
control options. For example, this site does not allow for the construction of a
conventional detention basin because adequate grade does not exist to allow for water
1 quality controls (i.e. orifice plate outlet works), nor does down-gradient elevation drop
allow for a reasonably sized outlet channel. However, the highly permeable soils that
1 exist at this location provide reasonable site conditions wherein a retention facility can
effectively provide runoff controls, both in regard to discharge rate and water quality
controls.
Maintenance of runoff control structures will be minimal. Once native grasses are
established within the retention facility and inlet channel, periodic mowing may be
1 required to maintain adequate retention facility volume. Upon completion of the
retention facility excavation and final grading, the site will be revegetated with a mixture
1 of native grasses. All disturbed areas aside from the treatment facility and access drive
will be stabilized by revegetation. Topsoil will be stripped and stockpiled during
retention facility and site grading, and will be replaced or the remaining soil will be
1 amended as needed in the top 6-inches of final grade to facilitate plant growth. Sod-
forming, native, perennial grasses will be planted in accordance with UDFCD
recommendations, as revised specifically by Weld County. For a Range Site defined by
1 the Soil survey of Weld County, Colorado, Northern Part (USDA Soil Conservation
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Conquest Oil C7 Site
Final Drainage Report
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' Service and Forest Service, August, 1982) as "Loamy Soils on Plains, Adjacent Stream
Terraces, and Upland Ridges," and the corresponding Weld County Range Site "Loamy
Plains, Clayey Plains, Loamy Slopes," a seed mix including, but not limited to, the
following, is recommended:
' COMMON NAME RECOMMENDED % IN SEEDING
' VARIETIES MIX RATEIDRYLAND
lbs of Pure Live
Seed (PLS)/acre
' Western wheatgrass Arriba, Barton, Rosana 20 to 45 8.0
Sideoats grama Vaughn, Butte, Niner, El 20 to 40 4.5
Reno, Haskell
' Blue grama Hachital, Lovington 10 to 25 1.5
Green Needlegrass Refer to local seed dealer for Up to 30 5.0
' recommendations on variety
Needleandthread Refer to local seed dealer for Up to 15 7.5
recommendations on variety
' Switchgrass Grenville, Nebraska 28, Up to 20 2.5
Blackwell, Pathfinder
Big bluestem Kaw Up to 10 5.5
' Little bluestem Pastura, Cimmarron Up to 10 3.5
Buffalograss Texoka, Sharps Up to 10 Bur: 8.0
Improved Floret: 3.0
' Yellow Indiangrass Llano, Hlt, Cheyenne, Up to 10 5.0
Oto
' The final selected seed mix will be based on the above seeding options, and will be
determined in accordance with Weld County specifications. For example, the rate of
' seeding of Western wheatgrass would be determined as follows:
1. Seed at a rate of 8.0 PLS/acre at 30% in the seed mix;
2. 30% x 8.0 = 2.4 pounds of Western Wheatgrass in the mix per acre;
3. 2.4 x 5 acres (approximate disturbed area requiring revegetation) = 12
' pounds of Western Wheatgrass in the overall mix.
The combination of species chosen will result in a selected seed mix that will equal
100%. Seed mixtures will be sown at the proper time of year at the recommended
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Conquest Oil C7 Site
1 Final Drainage Report
August 24, 2010
Page 10
1 seeding rate. Whenever possible, the seeds will be drill-seeded, and mulched following
1 seeding.
A Construction Stormwater Discharge Permit Application (COR03-0000) has been
1 submitted to the Colorado Department of Public Health and Environment (CDPHE). A
copy of the permit application is provided herein in Appendix E.
1 V. Conclusions
1 A. Compliance with the Weld County Code
With an approved variance for a retention facility, this preliminary drainage design will
meet applicable Weld County Code.
' B. Drainage Concept
1 As proposed, the drainage plan is designed to prevent damage from stormwater runoff
to both the Conquest facility and to adjacent properties. The on-site retention facility will
mitigate runoff peaks in response to a 100-year, 1-hour precipitation event. Because
1 there is no Weld County Master Drainage Plan for this area, there are no related
recommendations that would influence or be influenced by the proposed project. There
will be no negative effect on irrigation companies or other property owners in the
1 vicinity. The drainage design is based on runoff calculations computed through the
UDFCD Colorado Urban Hydrograph Procedure (CUHP).
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References
' 1. Bedient, Philip B., and Huber, Wayne C. Hydrology and Floodplain Analysis,
Addison-Wesley Publishing Company, 1988
' 2. Colorado Urban Hydrograph Procedure (CUHP), Version 1.3.3., Urban
Drainage and Flood Control District, Denver, CO., January 21, 2008.
3. Soil Survey of Weld County, Colorado, Northern Part, United States
' Department of Agriculture, Soil Conservation Service and Forest Service,
August 1982.
4. Urban Storm Drainage Criteria Manual, Urban Drainage and Flood Control
District, Denver, CO., June 2001, Revised April 2008.
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' FIGURE 1
■ SITE VICINITY MAP
I COLORADO CONQUEST C7 FACILITY
NI WELD COUNTY ROAD 74/HWY 392
BRIGGSDALE, COLORADO
I SCALE 1:24000 PROJECT NO. PREPARED BY
CG • ENVIRONMENTAL
1250 0 1250 12439 AFG COMPLIANCE
• QUADRANGLE DATE REVIEWED BY a
I LOCATION
FEET 5/11/2010 "'
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ITable 1
SOIL ANALYTICAL DATA
Proposed Conquest Oil C-7 Facility
'
WCR 69 and WCR 74
Briggsdale, Colorado
ICGRS Project: 1-8019-12439aa
ISample ID Depth Date Benzene Toluene Ethyl-Beaaeue Kylenes TVPH TEPH
(t). (m8/K8) (m8/KB) @mSIKB) (m6/KS) (mi/KS) (m6/K81
ITH-3 15 03/18/10 <0.01 <0.01 <0.01 <0.01 <0.5 < 10.0
TH-4 15 03/18/10 <0.01 <0.01 <0.01 <0.01 <0.5 <10.0
ITH-5 15 03/18/10 <0.01 <0.01 <0.01 <0.01 <0.5 <10.0
MDL 0.01 0.01 0.01.. :0.01 0.5 10.0
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CDLE/0PS-RBSL/TPH Threshold 0.26 170 190 260 500 500
COGCC Allowable Concentration for 0:17 85 100 175 500 500
sensitive area
INotes:
Concentrations exceeding Tier I RBSLs,500 mg/Kg TPH threshold value or CGOCC allowable
concettrations expressed in bold face
I
TVPH=Total Volatile Petroleum Hydrocarbons
TEPH=Total Extractable Petroleum Hydrocarbons
RBSL=CDLE/OPS-Tier 1 Risk Based Screening Level
I TPH=total petroleum hydrocarbons
MDL=Method Detection Limit
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TABLE 2
' GROUNDWATER ANALYTICAL DATA
Proposed Conquest Oil C-7 Facility
' WCR 69 and WCR 74
Briggsdale,Colorado
CGRS Project: 1-8019-12439aa
1
D
Sample ID Date waiter Depth TO
BenzeneEthyl-
Toluene Remene Xylenes
{ft) (mg/L) (m¢/L) (mg/L) {mglL)
' TH-3 03/18/10 20.82 <0.001 <0.001 <0.001 0.002
TH-4 03/18/10 21.72 <0.001 <0.001 <0.001 <0.001
' TH-5 03/18/10 22.55 <0.001 <0.001 <0.001 <0.001
COGCC Allowable - 0.005 0.56 0.7 1.4
Concentration for sensitive area
MDL - 0.001 0.001 0.001 0.001
Notes:
Depth to groundwater is measured from the top of the temporary monitoring well casing,which is
approximately 3 feet above ground surface.
Values in bold face exceed MCLs
TVPH=Total Volatile Petroleum Hydrocarbons
TEPH=Total Extractable Petroleum Hydrocarbons
MTBE=Methyl Tertiary Butyl-Ether
MCL=Maximum Contaminant Level
MDL=Method Detection Limit
' 1 of 1
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I VI.Appendices
A. Soils Map and Information
IB. Soil Boring Logs
C. Hydrologic Computations
I D. Hydraulic Computations
E. CDPHE Stormwater Discharge Permit Application and Stormwater
Discharge Permit Certification - Permit No. COR03G682
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IAppendix A
ISoils Map and Information
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IInside back cover:
SCS Soil Survey of Weld County, Colorado, Northern Part
ISheet 37
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I82 Soil survey
I B2t-5 to 17 inches; brown (10YR 5/3) sandy loam, dark 3 to 5 when moist, and it has chroma of 2 to 4. It is
brown (10YR 4/3) moist; weak coarse prismatic mildly alkaline or moderately alkaline.
structure; slightly hard, very friable;very few thin
I clay films on faces of pads and lining interstitial Treon series
pores; mildly alkaline; clear smooth boundary.
Cica-17 to 32 inches; light olive brown (2.5Y 5/4) The Treon series consists of shallow, well drained,
loamy sand, olive brown (2.5Y 4/4) moist; single moderately rapidly permeable soils on dissected plains,
I grain; loose; strongly effervescent; moderately upland ridges, and escarpments. These soils formed in
alkaline; clear wavy boundary. calcareous loamy residuum derived from sandstone.
C2r-32 inches; calcareous sandstone. Slope is 5 to 20 percent.
These soils are loamy, mixed, mesic, shallow
Thickness of the solum ranges from 15 to 29 inches. Torriorthentic Haplustolls.
I Depth to free carbonates ranges from 12 to 20 inches. Typical pedon of Treon fine sandy loam, 5 to 20
The profile is 0 to 15 percent coarse fragments. Depth to percent slopes, 1,800 feet west and 600 feet south of
sandstone ranges from 20 to 40 inches. The A horizon the northeast corner of sec. 35, T. 12 N., R. 64 W.
has value of 5 to 7 when dry and 3 or 4 when moist, and
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it has chroma of 1 to 3. The B horizon commonly Is 9 to Al-0 to 7 inches; brown (10YR 5/3) fine sandy loam,
18 percent clay. It is neutral or mildly alkaline. The C dark brown (10YR 3/3) moist; moderate fine and
horizon is moderately alkaline or strongly alkaline. medium granular structure; soft, very friable; strongly
effervescent; mildly alkaline; clear smooth boundary.
I Thedalund series C1ca-7 to 11 inches; very pale brown (10YR 7/3) fine
sandy loam, dark brown (10YR 3/3) moist; massive;
The Thedalund series consists of moderately deep, slightly hard, very friable; disseminated lime; violently
well drained, moderately permeable soils on fans, upland effervescent; mildly alkaline; abrupt smooth
I ridges, and plains. These soils formed in calcareous boundary.
C2r loamy residuum derived from fine-grained sandstone, —11 Inches; calcareous fine-grained sandstone.
shale, and siltstone. Slope is 0 to 9 percent.
These soils are fine-loamy, mixed (calcareous), mesic Thickness of the mollic epipedon ranges from 7 to 12
I Ustic Torrlorthents. inches. Depth to free carbonates ranges from 0 to 4
Typical pedon of a Thedalund loam in an area of inches. The profile is 0 to 10 percent coarse fragments.
Thedalund-Keota Imams, 3 to 9 percent slopes, about Depth to sandstone ranges from 10 to 20 inches. The A
600 feet north and 2,340 feet west of the southeast horizon has value of 4 or 5 when dry and 2 or 3 when
I corner of sec. 15, T. 15 N., R. 61 W. moist, and it has chrome of 2 or 3. It is neutral to
moderately alkaline. The C horizon commonly is fine
A1---0 to 3 inches; grayish brown (10YR 5/2) loam, dark sandy loam, but in some pedons it is sandy loam. It is
grayish brown (10YR 4/2) moist; moderate fine mildly alkaline or moderately alkaline.
I granular structure; soft, very friable; slightly
effervescent; mildly alkaline; clear smooth boundary. Vona series
AC-3 to 13 inches; brown (10YR 5/3) loam, grayish
brown (10YR 5/2) moist; weak coarse angular The Vona series consists of deep, well drained and
I blocky structure; slightly hard, friable; strongly somewhat excessively drained, moderately rapidly
effervescent; moderately alkaline; gradual smooth permeable soils on smooth to dissected plains. These
boundary. soils formed in calcareous sandy alluvial or eoiian
C1-13 to 25 inches; light brownish gray (10YR 6/2) material. Slope is 0 to 9 percent.
I loam, grayish brown (10YR 5/2) moist; weak fine These soils are coarse-loamy, mixed, mesic Ustollic
and medium subangular blocky structure; slightly Haplargids.
hard, friable; violently effervescent; moderately Typical pedon of Vona sandy loam, 3 to 9 percent
alkaline; abrupt smooth boundary. slopes, about 1,000 feet west and 5 feet north of the
I C2r-25 inches; calcareous siltstone. southeast corner of sec. 19, T. 10 N., R. 64 W.
Depth to free carbonates ranges from 0 to 4 inches. Al—0 to 6 inches; brown (10YR 5/3) sandy loam, brown
Content of siltstone fragments in the profile ranges from (10YR 4/3) moist; weak medium granular structure;
I 0 to 15 percent but commonly is less than 10 percent. soft, very friable; mildly alkaline; clear smooth
Depth to bedrock ranges from 20 to 40 inches. The boundary.
control section commonly is loam, but in some pedons it 821-6 to 10 inches; brown (10YR 5/3) sandy loam, dark
is very fine sandy loam or light clay loam. It is 18 to 35 brown (10YR 4/3) moist; weak coarse prismatic
I percent clay and 15 to 45 percent sand that is fine or structure; slightly hard, very friable; mildly alkaline;
coarser. The A horizon has value of 5 to 7 when dry and clear smooth boundary.
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IWeld County, Colorado, Northern Part 83
1 83-10 to 15 inches; yellowish brown (10YR 5/4) coarse inches. The A horizon has value of 4 or 5 when dry and
sandy loam, brown (10YR 5/3) moist; weak coarse 2 or 3 when moist, and it has chrome of 2 or 3. The B
prismatic structure; soft, very friable; mildly alkaline; horizon commonly is sandy clay loam, but in some
I gradual wavy boundary. pedons It is light clay loam or loam. It is 18 to 35 percent
C1-15 to 30 inches; light yellowish brown (10YR 6/4) clay and is 20 to 65 percent sand. The B horizon Is
loamy sand, yellowish brown (10YR 5/4) moist; neutral or mildly alkaline. The C horizon is moderately
massive; soft, very friable; strongly effervescent; alkaline or strongly alkaline.
I moderately alkaline; clear smooth boundary.
C2ca-30 to 60 inches; very pale brown (10YR 7/4) Weld series
loamy sand, yellowish brown (10YR 5/4) moist;
massive; soft, very friable; common fine irregularly The Weld series consists of deep, well drained, slowly
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shaped seams and soft masses of lime; strongly permeable soils on smooth plains. These soils formed in
effervescent; moderately alkaline. calcareous, loamy eolian material. Slope is 0 to 6
percent.
Thickness of the solum ranges from 15 to 35 inches. These soils are fine, montrnorillonitic, mesic Aridic
I Depth to free carbonates ranges from 8 to 24 inches. Paleustolls.
The A horizon has value of 5 or 6 when dry and 3 to 5 Typical pedon of Weld loam, 0 to 6 percent slopes,
when moist, and it has chroma of 2 or 3. It is sandy loam 300 feet west and 500 feet south of the northeast corner
or loamy sand. The B horizon commonly is sandy loam, of sec. 23, T. 8 N., R. 56 W.
I but in some pedons it is fine sandy loam. It is neutral or A1-0 to 7 inches; brown (10YR 5/3) loam, very dark
mildly alkaline. The C horizon is moderately alkaline or grayish brown (10YR 3/2) moist; weak medium
strongly alkaline. prismatic structure parting to weak medium and
coarse subangular blocky; slightly hard, very friable;
I Wages series neutral; clear smooth boundary.
The Wages series consists of deep, well drained, A2--7 to 9 inches; pale brown (10YR 6/3) fine sandy
loam, brown (10YR 4/3) moist;weak fine and
moderately permeable soils on dissected plains and
alluvial fans. These soils formed in calcareous loamy medium prismatic structure parting to weak fine and
I alluvium. Slope is 0 s l ercent. medium subangular blocky; slightly hard, very friable;
P P neutral; abrupt smooth boundary.
These soils are fine-loamy, mixed, mesic Acidic B21t-9 to 14 inches; yellowish brown (10YR 5/4) clay,
Argiustolls. brown (10YR 4/3) moist; strong fine and medium
Typical pedon of Wages fine sandy loam, 6 to 9 prismatic structure parting to strong fine and
I percent slopes, 220 feet west and 700 feet north of the southeast corner of sec. 34, T. 11 N., R. 65 W. medium angular blocky; hard, firm, sticky and plastic;
common moderately thick clay films on faces of
peds; neutral; clear smoothboundary.
A1-0 to 4 inches; grayish brown (10YR 5/2) fine sandyo
loam, very dark grayish brown (10YR 3/2) moist; B22t-14 to 18 inches; yellowish brown (10YR 5/4)
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moderate fine granular structure; slightly hard, very heavy clay loam, brown (10YR 4/3) moist; strong
fine and medium angular blocky structure; hard, firm,
friable; neutral; abrupt smooth boundary. sticky and plastic; few thin clay films on faces of
B2t-4 to 14 inches; grayish brown (10YR 5/2) sandy peds; neutral; clear smooth boundary.
I clay loam, very dark grayish brown (10YR 3/2)moist; moderate medium prismatic structure parting Baca-16 to 22 inches; pale brown (10YR 6/3) silty clay
loam, brown (10YR 4/3) moist; moderate fine and
to moderate medium and coarse subangular blocky; medium subangular blocky structure; hard, friable,
hard,firm; many thin clay films on faces of peds; sticky and plastic; strongly effervescent; strongly
I mildly alkaline; abrupt wavy boundary. alkaline; clear smooth boundary.
Clca
-22 ca-14 to 29 inches;very pale brown (10Th 7/3) light a-22 to 28 Inches; very pale brown (10YR 7/3)
loam, brown (10YR 5/3) moist; weak medium loam, brown (10YR 5/3) moist;weak medium and
subangular blocky structure; slightly hard, friable; coarse subangular blocky structure; slightly hard,
I violently effervescent; moderately alkaline; gradual very friable, slightly sticky and slightly plastic;
wavy boundary. violently effervescent; strongly alkaline; clear smooth
C2ca-29 to 60 inches; very pale brown (10YR 7/4) boundary.
loam, yellowish brown (10YR 5/4) moist; massive; C2ca-28 to 60 inches; light yellowish brown (10YR 6/4)
I soft,very friable; common fine slightly oblong seams loam, yellowish brown (1OYR 5/4) moist; massive;
of lime; violently effervescent; moderately alkaline. soft, very friable; violently effervescent; strongly
alkaline.
Thickness of the solum ranges from 12 to 15 inches.
I Thickness of the mollic epipedon ranges from 7 to 15 Thickness of the solum ranges from 18 to 34 inches.
inches. Depth to free carbonates ranges from 10 to 14 Thickness of the mollic epipedon ranges from 7 to 14
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I144 SoII survey
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' Appendix B
Soil Boring Logs
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I
IBOREHOLE NUMBER
CGRS FIELD BOREHOLE LOG TH-1
PROJECT NUMBER: 1-8019-12439aa TOTAL DEPTH: 10'
PROJECT NAME: Conquest Oil C-7 TOP OF RISER:-
' (with cap removed)LOCATION: Briggsdale, CO STATIC WATER LEVELS(BGS)
DRILLING CO: Drilling Engineers, Inc.
' DRILLING METHOD: HSA Time
DRILLER: Sean Date
LOGGED BY: TJ Grisel
I
Water Level
START: 3/18/2010 COMPLETED: 3/18/2010 Casing Depth
I c
_ z
ki —
o
I
Notes LITHOLOGY
Z DEPTH DESCRIPTION (FPm)
a) a) 0
� a) m
a_
cn a E co E
i co
E
co cn
I _- - _--_
SANDY SILT: Brown, fine to
very flue-grained, stiff, moist
(SM) - - -
I - - __
CAL 1 15 18 18 0.0@2'bgs --
! CAL 2 21 18 18 0.0@4'bgs -
I --5
! - _
I SAND: Brown,fine to medium-
grained, sub-angular, medium
dense, moist(SW) 0.0 @ 9' bgs
CAL 3 16 18 18
-10
\End of Boring @ 10'bgs I
I
IBOREHOLE NUMBER
CGRS FIELD BOREHOLE LOG
TH-2
1 PROJECT NUMBER: 1-8019-12439aa TOTAL DEPTH: 25'
PROJECT NAME: Conquest Oil C-7 TOP OF RISER:-
' (with cep removed)LOCATION: Bnggsdale, CO
DRILLING CO: Drilling Engineers, Inc. STATIC WATER LEVELS(BGS)
1 DRILLING METHOD: HSA Time
DRILLER: Sean Date
• LOGGED BY: TJ Grisel Water Level
START: 3/18/2010 COMPLETED: 3/18/2010 Casing Depth
I c
I
$' DEPTHce DESCRIPTION Notes LITHOLOGY
U w o
a 3 co co
E E
o
°p c°n ca
v1
SANDY SILT: Brown,fine to
very fine-grained, very stiff, . . —...
moist(SM) --.. _=
ICAL 1 30 18 18 V
'_5 0.0@5' bgs
I CAL 2 36 18 18 _ ..'_
-10
SAND: Brown, fine to medium 0'Q e° 10'bgs
grained, sub-angular, very
-
I
_ dense, moist to wet @ 15' bgs
to saturated @ 20'bgs; No
CAL 3 45 18 18 - Recovery @ 20'bgs(SW)
' -15 0.0@15'bgs
CAL 4 50+ 18 0
-20 NM @ 20' bgs
ICAL 5 50+ 18 4 - 0.0 @ 25' bgs
— -25
\EndOf Boring @ 25' bgs /
FIELD BOREHOLE LOG BOREHOLE NUMBER
CGRS TH-3
PROJECT NUMBER: 1-8019-12439aa TOTAL DEPTH : 30'
PROJECT NAME: Conquest Oil C-7 TOP OF RISER :-
I LOCATION : Briggsdale, CO (with cap removed)
DRILLING CO : Drilling Engineers, Inc. STATIC WATER LEVELS(BGS)
I DRILLING METHOD : HSA Time 0950 1050 1239
DRILLER : Sean Date 3/18/2010 3/18/2010 3/18/2010
I LOGGED BY:TJ Grisel Water Level 20.90 20.84 20.82
START: 3/18/2010 COMPLETED : 3/18/2010 Casing Depth 32.25 •
c
y >-
I
8. I NOTES O WELL WELL
ZDESIGN DESCRIPTION (pprn) = CONSTRUCTION
a) a) o oa) = F-
Era £ o E E 0-
uj
' rn rn m n to
I _ Stick-Up(-3
ft)
—0 —
SANDY SILT:Gray,fine-grained, . _ - •
. _
stiff,moist(SM) •
.� 6',`-
CAL 1 18 24 9 — --
--5 - :4
0.0 @ 5'bgs ,fir
,it Vi.
ICAL 2 18 24 3 _ -1 C " ''
0.0@10'bgs " '~ ‘,,t......
;
SAND: Brown,fine to medium-
grained, sub-angular,medium- - a '
_ dense,moist to very moist @ 14' ,.;t,
bgs ; Natural 4t'
CAL 3 15 24 7 ;^. ' s
`-15 SILTY CLAY:Wet,brown, rather 0.0 @ 15' (�-� "
I
J r V -V1 r .-;;
_ `stiff,some fine sand(CL) Retained
°•.,.� s,;
/ Retained for :•] '" '
ilr
Analysis
SAND: Brown,fine to medium-
CAL 4 50+ 24 0 - grained,sub-angular,medium
-2C dense to very dense;wet to
NM @ 20'bgs : 1"Sch.40
- saturated @ 20'bgs;No recovery : PVC Riser
@ 20'bgs . 10/20 Silica -
I - Sand filter
CAL 5 50+ 24 21 —-2F
SILTY SAND:Brown,fine-grained,
0.0 @ 25'bgs T T;r T_ 1"Sch/e�dule
I
TTrr.T.r T:- 40 PVC
sub-angular,very dense, T+.1--r T- screen#10
T-r T.T_
saturated(SM) T. r r'T T._ slot
-1" 7-
T.rr..,_H:7,
r.'I
I
CAL 6 50+ 24 24 - 0.0 @ 30'bgs „Tr,.r..T.T.TT
3
End of Boring @ 30'bgs /
I
LOG BOREHOLE NUMBER
CGRS FIELD BOREHOLE TH-4
1 PROJECT NUMBER : 1-8019-12439aa TOTAL DEPTH : 20'
PROJECT NAME : Conquest Oil C-7 TOP OF RISER :
I LOCATION : Briggsdale, CO (with cap removed)
Drilling Engineers, Inc. STATIC WATER LEVELS(BGS)
DRILLING CO: g
I DRILLING METHOD : HSA Time 1149 1259
DRILLER: Sean Date 3/18/2010 3/18/2010
I LOGGED BY:TJ Grisel Water Level 22.25 21.72
START: 3/18/2010 COMPLETED : 3/18/2010 Casing Depth 23.20
I —c c
` t j (DO0
>-
O
N
I NOTESWELL WELL
E
j DESCRIPTION (ppm) _..i DESIGN CONSTRUCTION
a) a) o a) a) I I-
E a
E a
Lu
a
•
Stick-Up(-3
_ ft)
I -0 SANDY SILT:Brown,fine-grained, - _-
medium-stiff, moist;Clay tense @ '�-" •- r:-...,.. --
_ 14'bgs(SM) _ =_
I - : =
ypY
. ?rev
-
SB 1 7 18 12 —
I _5 ..
0.0 @ 5'bgs _ Natural
- Backfill . � i:
w
- _ `M.Y
SB 2 14 18 14 _ 1"Sch.40
I
-1 C — _77...
_ PVC Riser
0.0@10'bgs --
1 -
I SB 3 10 18 11 SAND: Brown,fine to medium-
_
-15 grained,sub angular,loose,wet 0.0 @ 15' . 10/20 Silica
Increasing fine-grained sand with bgs;Sample •. : Sand filter
depth(SW) Retained for
I Analysis •
: 1"Schedule -
40 PVC
screen#10
I SB 4 32 18 8 0.0 @ 20'bgs :•:•:-:•:.:-:•:•:,
' slot
� 2 /- End of Boring @ 20'bgs
I
I C G RS FIELD BOREHOLE LOG BOREHOLE NUMBERI
PROJECT NUMBER:1-8019-12439aa TOTAL DEPTH : 20'
I PROJECT NAME : Conquest Oil C-7 TOP OF RISER :
LOCATION : Briggsdale, CO (with cap removed)
STATIC WATER LEVELS(BGS)
DRILLING CO: Drilling Engineers, Inc.
DRILLING METHOD : HSA Time 1228 1325
DRILLER : Sean Date 3/18/2010 3/18/2010
I LOGGED BY:TJ Grisel Water Level 23.29 22.55
START: 3/18/2010 COMPLETED : 3/18/2010 Casing Depth 23.55
n
Z o' NOTES r WELL DESIGN WELL
D ,- y DESCRIPTION CONSTRUCTION
F- Z � � � (PA n1) �
Ol N ct 00 I I
Ti 15. i— J
E E O E E Lin
1 co Cn m C!3 g O
- Stick-Up(-3
ft)
I -0 't "
SAND: Brown,fine-grained,
- medium dense to dense @ 15 bgs
very dense @ 20'bgs,moist to
Ito
- wet @ 18'bgs to saturated @ 20' —
bgs(SP) '==
SB 1 9 18 9 `1 ` `
I
--5 0.0 •:•:•:•:•:•:•:::•: s
@ 5'bgs Natural backfill . , �".-
=i': fix
J vr- 7'77
I SB 2 9 18 18 - : 1"Sch.40
— -1C : PVC Riser
0.0 •:•:•:•:•:•:•:•:•:
@ 10'bgs i..:'
I _
I SB 3 22 18 10
-1F. 0.0 @ 15' • 10/20 Silica
- bgs;Sample Sand filter -
Retained for •••• -
' _ Analysis •
: 1"Schedule "'
40 PVC
. screen#10
t SB 4 40 18 12 --
0.0 @ 20'bgs : slot
2 I t End of Boring @ 20'bgs
I
I
I
IAppendix C
tHydrologic Computations
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I
Hydrologic Computations
I As required, hydrologic computations make basic assumptions regarding land use on
adjacent properties. The property is bordered on the south by Weld County Road 74,
on the east by Weld County Road 69, and by undeveloped pasture land on the north
I and west sides. No developed land exists adjacent to the subject property, with the
exception of the area southeast of the subject property. In that direction is the
abandoned UP Railroad right-of-way and Colorado State Highway 392.
IStorm runoff computations are based on the UDFCD CUHP model for the historic/
I undeveloped (167 acres) 100-year, 1-hour and the developed (11.68 acres) 100-year,
1-hour precipitation events for sizing the inlet runoff channel and the retention facility,
respectively. The applicant recognizes that use of the 100-year 1-hour precipitation
I event is being done for this project site only, and that it does not represent a precedent-
setting assumption for such projects in Weld County. The site drainage plan is based
on the requirement to retain 1.5 times the 100-year, 1-hour precipitation event runoff
Ivolume and sized to facilitate retention facility total emptying (via subsurface
percolation) within a 72-hour period. Assumptions and input values used for UDFCD
Imodels are summarized below.
UDFCD Model Input Values and Hydrologic Assumptions
I I. CUHP 100-YEAR,1 HOUR PRECIPITATION
(Inlet Channel Sizing) EVENT
100-Year, 1-Hour Precipitation Depth 2.86 in
I Drainage Area 167 Acre= 0.26 Square Miles
Average Slope 0.012 ft/ft
Distance to Centroid 0.71 mi
I Drainage Length 1.42 mi
Percent Impervious 0.0%
Pervious Depression Storage 0.40 in
I Impervious Depression Storage 0.10in
Initial Infiltration Rate 4.50 in/hr
Horton's Decay Coefficient 0.0018 1/sec
' Final Infiltration Rate 0.60 in/hr
RESULTS:
Peak Discharge 150 cfs
Time of Concentration 70.0 minutes
III. CUHP 100-YEAR,1-HOUR PRECIPITATION
(Retention Facility Volume) EVENT
100-year, 1-Hour Precipitation Depth 2.86 in
I Drainage Area 11.68 Acres= 0.018 Square Miles
Average Slope 0.002 ft/ft
Distance to Centroid 0.076 mi
I Drainage Length 0.152 mi
Percent Impervious 27%
I
I
I
Pervious Depression Storage 0.40 in
Impervious Depression Storage 0.10 in
Initial Infiltration Rate 4.50 in/hr
Horton's Decay Coefficient 0.0018 1/sec
Final Infiltration Rate 0.60 in/hr
' RESULTS:
Discharge Volume 83,288 cubic feet
Time to Peak 45.0 minutes
Peak Runoff Flowrate 23.0 cfs
As shown on the UDFCD spreadsheet printouts, the historic (167 acre drainage
basin)100-year, 1-hour event will produce a peak discharge rate of 150 cfs (used for
inlet channel design), and the developed (11.68 acre drainage basin) 100-year, 1-hour
event will produce a runoff volume of 83,288 cubic feet. As required, the retention
facility is designed to retain a total runoff volume of 1.5 times the 100-year, 1-hour event
runoff, or a total of 124,932 cf, plus 1-foot of freeboard.
As required, the following copies of UDFCD spreadsheets for the CUHP printouts are
' attached:
• Hydrologic Zones in the State of Colorado;
• Intensity-Duration-Frequency (IDF) Table for Zone One in the State of Colorado;
• One-Hour Rainfall Depth Design Chart;
• UDFCD Colorado Urban Hydrograph Procedure printouts for the historic and
developed 100-Yr 1-Hr precipitation events, including:
➢ CUHP 2005 Project Summary;
➢ New Catchment Setup Table;
➢ Printouts for User Selected Storm Hydrographs and Unit Hydrographs;
I ➢ Summary of Unit Hydrograph Parameters Used by Program and
Calculated Results (Version 1.3.3);
➢ Summary of CUHP Input Parameters (Version 1.3.3); and
' ➢ Copies of UDFCD Drainage Criteria Manual, Tables RO-6 and RO-7
specifying Depression Losses and Horton's Equation Parameters used,
respectively.
I
I
HYDROLOGIC ZONES IN THE STATE OF COLORADO
I
IIdentify the hydrologic zone for your project site: Zone 1, 2, 3 or 4.
Zone 1: South Platte, Republican, Arkansas, and Cimarron River Basins
Zone 2: San Juan, Upper Rio Grande, Upper Colorado, and Gunnison River Basins, and
I Green River Basin below Confluence with the Yampa River
Zone 3: Yampa and Green River Basins above confluence of Green and Yampa Rivers
Zone 4: North Platte River Basins
IDefinition of these four zones:
-109 109 07 ---q. .------ It- -W- 10. 101 IM
r T t
3 i
4
I
.c
f i
I H.
I _
I I
1I I
2
t 1
I
I , I i I iH
I
II
I COLORADO w- ,MY
Ir l-- r1i9..n
z-.=�===
I ��:°"'_...-,�".:. i�w...e 1. ..e,.. .,,n••w soar
I - I
109 1a b) I9 10S i0i 101 ---- 102
IDesign Parameters for Various Zones
I
Zone 1 - Hour 2- hour 3- Hour
a b c d e f m n r q
1 0.2180 0.7090 0.0000 1.8970 0.4390 -0.0080 0.3420 0.6580 0.5970 0.4030
2 -0.0110 0.9420 0.0000 0.4940 0.7550 0.0000 0.3410 0.6590 0.5690 0.4310
I 3 0.0190 0.7110 0.0010 0.3380 0.6700 • 0.0010 0.2500 _ 0.7500 0.4670 0.5330
4 0.0280_ 0.8900 0.0000 0.6710 0.7570 -0.0030 0.2500 0.7500 0.4670 0.5330
IDuration in minutes 5.00 10.00 15.00 ' 30.00 Ratio to one-hr Depth 0.29 0.45 0.570.79
I12439 2010 0524 UD-RainZone v1.01a, ZONES 8/25/2010, 3:28 PM
I
I
' IDF TABLE FOR ZONE ONE IN THE STATE OF COLORADO
' Zone 1: South Platte, Republican, Arkansas, and Cimarron River Basins
Project: Conquest C7 Drainage Report
IEnter the elevation at the center of the watershed: Elev= 4,714 (input)
I 1. Rainfall Depth-Duration-Frequency Table
Enter the 6-hour and 24-hour rainfall depths from the NOAA Atlas 2 Volume III in rightmost blue columns
Return Rainfall Depth in Inches at Time Duration
Period 5-min 10-min 15-min 30-min 1-hr 2-hr 3-hr 6-hr 24-hr
I (1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
output output output output output output output input input
2-yr 0.30 0.47 0.59 0.82 1.04 1.16 1.25 1.40 1.70
5-yr 0.43 0.67 0.85 1.18 1.49 1.61 1.70 1.85 2.20
I
10-yr 0.52 0.80 1.02 1.41 1.79 1.93 2.03 2.20 2.60
25-yr 0.63 0.97 1.23 1.71 2.17 2.33 2.46 2.65 3.00
50-yr 0.73 1.13 1.44 1.99 2.52 2.65 2.75 2.90 3.40
I 100-yr 0.83 1.28 1.63 2.26 2.86 3.04 3.18 3.40 3.80
Note: Refer to NOAA Atlas 2 Volume Ill isopluvial maps for 6-hr and 24-hr rainfall depths.
2. Rainfall Intensity-Duration-Frequency Table
I Return Rainfall Intensity in Inches Per Hour at Time Duration
Period 5-min 10-min 15-min 30-min 1-hr 2-hr 3-hr 6-hr 24-hr
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
I output output output output output output output output output
2-yr 3.60 2.80 2.36 1.64 1.04 0.58 0.42 0.23 0.07
5-yr 5.18 4.02 3.40 2.35 1.49 0.81 0.57 0.31 0.09
10-yr 6.22 4.83 4.08 2.83 1.79 0.96 0.68 0.37 0.11
I 25-yr 7.54 5.85 4.94 3.42 2.17 1.17 0.82 0.44 0.13
50-yr 8.77 6.81 5.75 3.98 2.52 1.33 0.92 0.48 0.14
100-yr 9.94 7.71 6.51 4.51 2.86 1.52 1.06 0.57 0.16
I
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I
1 12439 2010 0524 UD-RainZone v1.01a,Z-1 8/25/2010, 3:28 PM
I
I
' One-Hour Rainfall Depth Design Chart
3.00 I- T--
I2.86 ♦
I2 5 ---_. i_._ . . __2.52 ♦I i
2.17 ♦
I
' 2.00 - ,- ___1 I
e I 1.79
o
a 1.50 _ II•. 1.49 tI
o
o I
c
cc
1.00 t04 4
,
0.50 jLI I
• -
0.00 . ..._1-___ - _ ...i.__._ _- _ __._._._ -._—_ L__
1 2 3 4 5 6
Return Period
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I12439_2010_0524_UD-RainZone v1.01 a, Z-1 8/25/2010, 3:28 PM
I
I
IDRAINAGE CRITERIA MANUAL(V. 1) RUNOFF
ITable RO-5--Runoff Coefficients,C
Percentage
Imperviousness Type C and D NRCS Hydrologic Soil Groups
I
0% 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr
0.04 0.15 0.25 0.37 0.44 0.50
5% 0.08 0.18 0.28 0.39 0.46 0.52
I
10% 0.11 0.21 0.30 0.41 0.47 0.53
15% 0.14 0.24 0.32 0.43 0.49 0.54
20% 0.17 0.26 0.34 0.44 . 0.50 0.55
25% 0.20 0.28 0.36 0.46 0.51 0.56
I 30% 0.22 0.30 0.38 0.47 0.52 0.57
35% 0.25 0.33 0.40 0.48 0.53 0.57
40% 0.28 0.35 0.42 0.50 0.54 0.58
I 45% 0.31 0.37 0.44 0.51 0.55 0.59
50% 0.34 0.40 0.46 0.53 0.57 0.60
55% 0.37 0.43 0.48 0.55 0.58 0.62
60% 0.41 0.46 0.51 0.57 0.60 0.63
I
65% 0.45 0.49 0.54 0.59 0.62 0.65
70% 0.49 0.53 0.57 0.62 0.65 0.68
75% 0.54 0.58 0.62 0.66 0.68 0.71
80% 0.60 0.63 0.66 0.70 0.72 0.74
I
85% 0.66 0.68 0.71 0.75 0.77 0.79
90% 0.73 0.75 0.77 0.80 0.82 0.83
95% 0.80 0.82 0.84 0.87 0.88 0.89
I 100% 0.89 0.90 0.92 0.94 0.95 0.96
TYPE B NRCS HYDROLOGIC SOILS GROUP
0% 0.02 0.08 0.15 0.25 0.30 0.35
5% 0.04 0.10 0.19 0.28 0.33 0.38
I
10% 0.06 0.14 0.22 0.31 0.36 0.40
15% 0.08 0.17 0.25 0.33 0.38 0.42
20% 0.12 0.20 0.27 0.35 0.40 0.44
I
25% 0.15 0.22 0.30 0.37 0.41 0:46
30% 0.18 0.25 0.32 0.39 0.43 0.47
35% 0.20 0.27 0.34 0.41 0.44 0.48
40% 0.23 0.30 0.36 0.42 0.46 0.50
I
45% 0.26 0.32 0.38 0.44 0.48 0.51
50% 0.29 0.35 0.40 0.46 0.49 0.52
55% 0.33 0.38 0.43 0.48 0.51 0.54
60% 0.37 0.41 0.46 0.51 0.54 0.56
I 65% 0.41 0.45 0.49 0.54 0.57 0.59
70% 0.45 0.49 0.53 0.58 0.60 0.62
75% 0.51 0.54 0.58 0.62 0.64 0.66
I
80% 0.57 0.59 0.63 0.66 0.68 0.70
85% 0.63 0.66 0.69 0.72 0.73 0.75
90% 0.71 0.73 0.75 0.78 0.80 0.81
95% 0.79 0.81 0.83 0.85 0.87 0.88
I100% 0.89 0.90 0.92 0.94 0.95 0.96
I
I 2007-01 RO-11
Urban Drainage and Flood Control District
I
1
CUHP 2005 Project Summary
1 CUHP Version: CUHP 2005 1.3.3 rel. 2/8/2010
System Information OS:Windows(32-bit) NT 5.01, Excel Version: 12.0
1 Project Title: Conquest C7 100-Yr 1-Hr Precipitation Event
Project Comment: Retention Pond "Pass Through" Rate
1 Run Date: 7/16/2010 16:43
Input Workbook: Cuhp133_1
Output Database: C:\Documents and Settings\paul\My Documents\C7 100-Yr Historic
1 Output Workbook: C:\Documents and Settings\paul\My Documents\C7 100-Yr Historic
SWMM File: <None>
SWMM Start Time: <None>
1
1
1
1
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1
1
1
1
1
1
1
1
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i
' Printouts for User Selected Unit Hvdrographs
flow in cfs
v
N O
1 N
C N
E
c �
y c
' £ o
a. V
5 12.79
10 37.82
' 15 64.52
20 84.09
25 96.51
' 30 101.53
35 101.05
40 98.74
45 94.68
' 50 88.87
55 81.31
60 74.50
' 65 70.47
70 66.44
75 62.41
' 80 58.38
85 54.36
90 50.54
95 48.28
100 46.02
105 43.76
110 41.49
' 115 39.23
120 36.97
125 34.71
' 130 32.44
135 30.18
140 27.92
' 145 25.66
150 23.39
155 21.13
160 19.84
165 19.09
170 18.33
175 17.58
' 180 16.83
185 16.07
190 15.32
' 195 14.56
200 13.81
205 13.05
210 12.30
' 215 11.55
220 10.79
225 10.04
' 230 9.28
235 8.53
240 7.78
■ 245 7.02
250 6.27
255 5.51
260 4.76
265 4.00
270 3.25
275 2.50
280 1.74
285 0.99
290 0.23
295 0.00
i
i
Printouts for User Selected Storm Hvdrozraohs
flow in cfs
v g
2
c u
' c u
'd v
E o
- u
5 0.00
10 0.00
15 0.00
20 0.00
25 0.62
30 10.12
35 31.99
40 60.97
45 89.24
50 113.08
55 130.31
60 140.99
65 147.42
70 150.02
75 148.51
80 143.00
85 135.51
90 128.36
95 121.23
100 114.09
105 106.97
110 99.91
115 93.16
120 87.68
125 82.94
130 78.52
135 74.33
140 70.29
145 66.37
150 62.56
155 58.85
160 55.15
165 51.47
170 47.78
175 44.09
180 40.45
185 37.47
190 35.16
195 33.21
200 31.47
205 29.88
210 28.40
215 27.02
220 25.74
225 24.50
230 23.26
235 22.03
240 20.81
245 19.58
250 18.35
255 17.12
260 15.89
265 14.66
270 13.43
275 12.20
280 10.97
285 9.75
290 8.52
295 7.29
300 6.06
■ 305 4.83
310 3.60
315 2.40
320 1.54
325 1.02
330 0.66
335 0.41
340 0.23
345 0.11
350 0.03
355 0.01
360 0.00
365 0.00
W O
Z O
y 6
E
0 -
0.
O
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ca as :n-
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N U 6
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U W C
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a
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' CUHP 2005 Project Summary
' CUHP Version: CUHP 2005 1.3.3 rel.2/8/2010
System Information OS:Windows(32-bit) NT 5.01,Excel Version: 12.0
' Project Title: Conquest C7 100-Yr, 1-Hr"Developed
Project Comment: Retention Pond Volume
' Run Date: 7/16/2010 16:30
Input Workbook: Cuhp133_1
Output Database: C:\Documents and Settings\paul\My Documents\C7 100-yr 1-Hr Developed
Output Workbook: C:\Documents and Settings\paul\My Documents\C7 100-yr 1-Hr Developed
SWMM File: <None>
SWMM Start Time: <None>
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10 0.02
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20 0.88
25 3.18
30 12.10
I 35 20.06
40 23.22
45 23.34
I 50 22.38
55 20.94
60 19.49
65 18.38
I70 16.73
75 14.75
80 12.66
I 85 10.74
90 9.31
95 8.18
100 7.22
I105 6.35
110 5.56
115 4.81
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120 4.10
125 3.36
130 2.59
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140 1.35
145 1.00
150 0.74
I 155 0.55
160 0.40
165 0.29
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170 0.20
175 0.15
180 0.12
185 0.10
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190 0.08
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200 0.04
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20 14.52
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40 7.77
45 6.72
50 5.68
55 4.63
60 3.63
65 3.28
70 2.93
75 2.58
80 2.23
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90 1.53
95 1.18
100 0.83
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' RUNOFF DRAINAGE CRITERIA MANUAL(V. 1)
' in Figure RO-A6 in Appendix A at the end of this chapter.
3.2.2 Depression Losses
Rainwater that is collected and held in small depressions and does not become part of the general
surface runoff is called depression loss. Most of this water eventually infiltrates or is evaporated.
' Depression losses also include water intercepted by trees, bushes, other vegetation,and ail other
surfaces. The CUHP method requires numerical values of depression loss as inputs to calculate the
effective rainfall. Table RO-6 can be used as a guide in estimating the amount of depression (retention)
losses to be used with CUHP.
Table RO-6—Typical Depression Losses for Various Land Covers
(All Values in Inches. For use with the CUHP Method)
Land Cover Range in Depression(Retention)Losses Recommended
Impervious:
' Large paved areas 0.05 0.15 0.1
Roofs flat 0.1 -0.3 0.1
Roofs-sloped 0.05-0.1 0.05
Pervious:
Lawn grass 0.2 -0.5 0.35
1 Wooded areas and open fields 0.2 -0.6 0.4
When an area is analyzed for depression losses,the pervious and impervious loss values for all parts of
the watershed must be considered and accumulated in proportion to the percent of aerial coverage for
each type of surface.
3.2.3 Infiltration
The flow of water into the soil surface is called infiltration. In urban hydrology much of the infiltration
occurs on areas covered with grass. Urbanization can increase or decrease the total amount of
infiltration.
Soil type is the most important factor in determining the infiltration rate. When the soil has a large
' percentage of well-graded fines, the infiltration rate is low. In some cases of extremely tight soil, there
may be,from a practical standpoint, essentially no infiltration. If the soil has several layers or horizons,
' the least permeable layer near the surface will control the maximum infiltration rate. The soil cover also
plays an important role in determining the infiltration rate. Vegetation, lawn grass in particular, tends to
increase infiltration by loosening the soil near the surface. Other factors affecting infiltration rates include
1 slope of land, temperature,quality of water, age of lawn and soil compaction.
As rainfall continues, the infiltration rate decreases. When rainfall occurs on an area that has little
' antecedent moisture and the ground is dry, the infiltration rate is much higher than it is with high
' RO-20 2007-01
Urban Drainage and Flood Control District
I
IRUNOFF DRAINAGE CRITERIA MANUAL(V. 1)
1 Table RO-7—Recommended Horton's Equation Parameters
NRCS Hydrologic Infiltration (inches per hour) Decay
I Soil Group Initial—f Final—f0 Coefficient—a
A 5.0 1.0 0.0007
B 4.5 0.6 0.0018
I C 3.0 0.5 0.0018
D 3.0 0.5 0.0018
I To calculate the maximum infiltration depths that may occur at each time increment, it is necessary to
integrate Equation RO-8 and calculate the values for each time increment. Very little accuracy is lost if,
instead of integrating Equation RO-8, the infiltration rate is calculated at the center of each time
Iincrement. This"central"value can then be multiplied by the unit time increment to estimate the
infiltration depth. This was done for the four NRCS hydrologic soil groups, and the results are presented
I in Table RO-8. Although Tables RO-7 and RO-8 provide recommended values for various Horton
equation parameters, these recommendations are being made specifically for the urbanized or urbanizing
watersheds in the Denver metropolitan area and may not be valid in different meteorologic and climatic
Iregions.
Table RO-8—Incremental Infiltration Depths in Inches*
I NRCS Hydrologic Soil Group
Time in Minutes** A B C and D
5 0.384 0.298 0.201
I 10 0.329 0.195 0.134
15 0.284 0.134 0.096
20 0.248 0.099 0.073
25 0.218 0.079 0.060
30 0.194 0.067 _ 0.052
35 0.175 0.060 0.048
40 0.159 0.056 0.045
_ 45 0.146 0.053 0.044
I
50 0.136 0.052 0.043
55 0.127 0.051 0.042
60 0.121 0.051 0.042
I 65 0.115 0.050 0.042
70 0.111 0.050 0.042
75 0.107 0.050 0.042
80 0.104 0.050 0.042
I 85 _ 0.102 0.050 0.042
90 0.100 0.050 0.042
95 0.098 0.050 0.042
100 0.097 0.050 0.042
105 0.096 _ 0.050 - 0.042
110 0.095 0.050 0.042
115 0.095 0.050 0.042
120 0.094 0.050 0.042 _
I *Based on central value of each time increment in Horton's equation.
*+Time at end of the time increment.
I RO-22 2007-01
Urban Drainage and Flood Control District
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' Appendix D
Hydraulic Computations
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Hydraulic Computations
' The drainage plan for this project does not involve the use of an outlet culvert nor a
storm sewer inlet. Accordingly, no such design details are provided. The retention
facility for the proposed project is designed to retain the total runoff volume of at least
' 1.5 times the runoff produced by the 100-year, 1-hour precipitation event for the
developed (11.68 acre) site of 124,9322 cubic feet. The corresponding retention facility
volume provided is 129,383 cf at the projected 100-year, 1-hour runoff flood stage which
' exceeds the minimum required volume. When including the additional retention
capacity provided by the 1-foot of freeboard to the existing 4,713 contour, and including
the capacity provided by the inlet channel, the corresponding retention storage volume
is estimated at 205,174 cubic feet — exceeding of the minimum required storage
volume, and also well in excess when including an additional 7,000 cf of retention
' storage that may be required for water quality considerations.
A trapezoidal inlet channel is designed to convey storm water runoff for the entire up-
gradient drainage basin with a peak design flow of 150.0 cfs as shown by the CUHP
model for the historic 100-year event. The inlet channel will convey runoff from the
northwest portion of the property to the retention facility at a design slope of 0.4%. This
is a trapezoidal channel with 4:1 side slopes, bottom width of 47 feet at a flow depth of
1.0 foot at the required conveyance discharge of 150 cfs. At design capacity, the
Froude Number is 0.52 and the estimated flow velocity is 2.94 feet per second;
considered to be a non-erosive flow velocity.
' The designed retention facility storage volume of 129,383 cf is accomplished by
excavating a retention basin within the existing 4,713 contour as shown on the Site
Drainage Plan. The following Area-Capacity table provides the calculations used to
verify that a total runoff capacity provided in the retention pond as designed exceeds the
minimum required retention volume of 124,932 cubic feet. Because of the very flat
' surface and the associated wide inlet channel (47-feet), as agreed to by Mr. Kimmi, the
total runoff storage volume of the retention facility includes the additional storage
capacity provided by the inlet channel.
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rl00CAM..w TO ✓. %Wf1C
•
l r r�
I>Conquest Oil C7 g
Retention Facility Area-Capacity Table
Required Capacity= 124,932 CF Sep - , //�
Ave. kre4b l Elevation Surface Surface Incremental Cumu e-u /fry GCB a..
Elevation( Difference Area Area Volume Volume
ft-MSL) (ft) (sf) (sf) (cf) (rf) Cwu"vo/
4708 15,625 0
1 16,657 16,657
4709 17,689 16,657
1 23,285 23,285
4710 28,881 39,942
1 36,566 36,566
4711 44,251 76,508
1 52,875 52,875
4712 61,499 129,383 >124,932 2.97 ac-c4
1 75,791 75,791
4713 90,083 205,174 Freeboard '1.71 ac-c4
1 140,685 140,685
4714 191,287 345,859 7,1 ,4 pc.c}.
Note: The required 1-foot of freeboard is provided by the existing
4713 contour;the total required retention facility volume is
provided below the 4712 contour.
124932
?iereRah. = 25. 5 min/in = 0.425 brim = 2.453
To -pucele6rn ,n 721.r t 2.353 ,' \(77 hr) n lcic1q �n = I')• /2 fl
L
W.II 395559 {3 ere.v" v' 72 Les
ril
be+dlrr. „xis-k aro.„% e, 721.ra = 3vs*59 1.1 2ti U
i y.12 fi
75, 791-ciz 4 tor Cott orm wovukc)
'Katt Cvn. he ?ow) iL4a dre..n In 12 Lra
Cl wk / �,nr..J - , 194, fi-
�arc r4�e. ( g()Ctmy. '\ lr l.r
1\gs.S w.
'/1
(.141.4+ht)(14+h(X14tktS 41).= 7757Vf+ .�
Vrl= 3445859 rt> 345_ 559�i3 _ )2.5 k'215-ria.Vikt
-r---� ,(I 7Z kr5
MAJOR DETENTION VOLUME BY FAA&MODIFIED FAA METHOD
(See USDCM Volume I Runoff Chapter for description of method)
Project: - USR-1747 Conquest C-7
Basin ID: -. ..Site Plan
(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)
The user must fill in all of the blue cells for these sheets to function.
Design Information(Input):
Catchment Drainage Imperviousness I.= 27,00 percent
Catchment Drainage Area A= 116800 acres
Predevelopnent NRCS Soil Group Type= B A,B,C,or 0
Return Period for Detention Control T= 100 years(2,5,10,25,50.or 100)
Time of Concentration of Watershed Tc= 67 minutes
Allowable Unit Release Rate(See Table A) q a 0.00 cfs/acre
One-hourrPrecipfation Pi= 3.80 inches —"IUCyr 24 kr e^k'-.
Design Rainfall DF Formula I=C1'P11(C2'eTcyC3
Coefficient One C,= 28,50
Coefficient Two Q= 10,00
Coefficient Three C)= 0.79
Determination of Average Outflow from the Basin(Calculated):
Runoff Coefficient C= 046
Inflow Peak Ruoff Op-in= 18,81 cfs
Allowable Peak Outflow Rate Op-out=` 0,00 cfs
Ratio of OPOWOPin Ratio= 000
Determination of.MAJOR Detention Volume Using FAA 8 Modified FM Method
40 o Enter Rainfall Duration Incremental Increase Value Here(e.g.5 for 5-Minutes)
RaiMal Rainfall Inflow Average Outflow Storage Adjustment Average Outflow Storage
Duration Intensity Volume Outflow Volume Volume Factor Outflow Volume Volume
minutes Inches/fir cubic feet (FAA,cfs) (FM,cf) (FM,cf) (Modified) (Mod,cis) (Mo,cf) (Mod,cf)
(input) (output) (output) (output) (output) (outgn) (output) (output) )output) (output)
0 0.00 0 0.00 0 0 0.00 000 t0
40 4.93 63512 -0.00 0 63,512 1➢0 :0.00 -.63,512
80 :3.10., 79,840 0.00 0 79,840 0 92 000 79,840
120 2.32 - .. 89,587 0.00 0 89,567 0.78- 0,00 - -89,587.
160 1.87 98,615 0,00 0 98,815 071 0.00 96,615
200 1.59 '. 102,201 0.00 0 102,201 067 0.00'. 102,201
.240 1.38 106,881 0,00 0 108,861' 0.84 ' 000 .1081881
280 1,23 110878 '. 0,00 0 110878 0.62 0.00 - 110'578
320 . 1.11 114,421 0.00 0 114,421 0.60 0.00 114,421
360 101 117,599 0,00. 0 117,599 0.59 0.00 - 117599
400 0,93 120,487 0,00 0 120,487 '.0.58 0,00' 120487
440 0,87 123,139 0.00 - `0 123,139 0.58 000 - 123,139
480 0.81 125,593 0,00 0 125,593 0.57 000 125,593
520 0.76 127,881 000 0 - 127,881 0:56 0.00 J 127,881
580 0.72 130,025 ' 0.00 0 ..,.130,025 0.56 000 130,025
600 088 132,045 0.00 0 132,045 0.56 0.00 132,045
640'- 0.65 133,955 0.00 0 933,955 0'.55 000 133,955
680 082 135,788 0.00 0 135,788 0.55 0.00 135,788
720 0.59 137,495 0,00 0 137,495 0,55 0,00°. - 137,495 -
760` 0,57 139,145 , 000 0 139,145 0.54 0.00 139,145
800 0.55 140.724 000 .:0 140.724 0.54 0.00 140,724
840 0.53 142,239 Y 0.00 0 142,239 0.54 0.00 142,239
880 0.51 143,898 0.00 0 143,896 0.54 0.00 - 143,696
920 0.49 145,100 0.00 0 145,100 0.54 0,00 145,100
980 047 148,454 000 0 146454 0.53 0,00 146,454
1000 0.48 147,783. 0.00 0 147,783 .0.53 0.00 147,763
1040 - 044 149,030 0.00 0 149,030 0.53 0.00. 149,030
1080 0.43 150256 0.00 0 150,258. 0.53 0,00 150,258
1120 0.42 151,449 0,00a 0 151,449 0,53 .000 151,449
1180 041 152,606 000 0 ` 152,608 0,53 000 152.806
1200 '0.40 153,731 0.00 0 153,731 ' - 0.53-. 000. 153,731
1240 0.39 154,628 0.00 0 154,828 0.53 0.00 154,826
1280 0.38 155,892 000. 0 155,892 0.53 0.00 155,892
1320 0.37 158,932 000 0 156,932 053 0.00 158,932
1380 035 157,947 000 0 157,947 0,52 0.00 157,947
1400 035 158,937 O0D 0 158,937 0,52 000 158,937
1440 D.34 159,905 0.00 0 159,905 0.52 -0.00 159,905
FAA Major Storage Volume(cubic ft.)= 159,905 Mod.FAA Major Storage Volume(cu is 8.)= 159,905
FAA Major Storage Volume(acre.ft.)= 3.6709 Mod.FAA Major Storage Volume(a re-n.)` 3.6709
UDFCD DETENTION VOLUME ESTIMATING WORKBOOK Version 2.01.Released August 2006
(3.(071)1 as:-4)(LS) = 55010 0.(--_c\—
UD-Detention v201.As,Modified FM 9/3/2010.1:12 PM
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Retention Facility Area-Capacity Table (based on surveyed point elevations)
Elevation Elevation Surface Ave. Incremental Cumulative
(ft— MSL) Difference Area Surface Volume Volume
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(ft) (f9) Area (ft2) (ft3) (ft)4,708 15,625 0
1 16,657 16,657
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4,709 17,689 20,752
1 23,285 23,285
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4,710 28,881 39,942
1 36,566 36,566
4,711 44,251 76,508
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1 52,875 52,875
4,712 61,499 129,383
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4,713 1 75,791 75,791
90.083 205,174
Note: The required 1-foot of freeboard is provided by the existing 4,713 contour
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(closed basin); the total minimum required retention facility volume is provided
below the 4,712 contour.
IWeld County requirements for a retention facility specify that the retention facility must
drain completely within a 72-hour period, based on percolation through the basin bottom
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only (i.e. any percolation through basin side slopes is not included). Based on a
measured percolation rate of 25.5 minutes/inch (perc test results: High Plains
Engineering and Design, March, 2010), the minimum required bottom surface area is
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calculated as follows:
Perc Rate = 25.5 min/in = 0.425 hr/in, or 2.353 in/hr.
ITotal percolation in 72 hr = 2.353 in/hr* 72 hr = 169.1 in/72 hr = 14.12 ft/72 hr
IRequired retention facility volume= 74,174 cf
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Required minimum bottom area = 74,174 cf/14.12 ft = 5,253 sf
Bottom Area Provided = 15.625 sf(125' x 125') >> 5.253 sf OK
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Trapezoidal Inlet Channel Design Calculations:
IDesign is based on Manning Formula, as follows:
Q = (1.49/n)AR2/3S1/2
' AR2i3 Qn/1.49S' 2
R NP
Where:
IQ = discharge (cfs)
A = cross sectional flow area (sf)
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R = hydraulic radius (ft)
P = wetted perimeter (ft)
S = slope (ft/ft)
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n = Manning roughness coefficient
AR2/3 Section Factor.
ISection factor is solved based on known conditions (Q, s, and n), followed by trial &
error solution for channel design values of flow depth, side slopes, and base width.
IQ = 150.0 cfs (discharge)
s = 0.004 ft/ft (slope)
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z 4:1 (channel side slopes)
n 0.030 (Mannings roughness coefficient for grassed channel)
ISolve for Section Factor:
AR2/3 = Qn/1.49S112 = (150)(0.030)/1.49(0.004)'/2
1 = 47.75
I R = NP
AR2/3 = A * (A/p)2/3 = Al.o7/Po.o7 = 47.75
IWhere (for a trapezoidal channel):
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A by + zy2
P b + 2(z2 +1)1/2
ITrial & Error Solution for b, assuming v = 1.0' and z = 4:
b = 47 ft @ b= 47', AR2/3 = 48.34 > 47.75 OK
I Check Corresponding discharge:
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tQ = (1.49)(48.34)(0.004)h/2/0.030
Q = 151.8 cfs > 150 cfs OK
Check for nonerodible flow velocity
' Q = VA
' V = Q/A
Where V = Average Flow Velocity
A = by + zy2
= (47)(1.0) + (4)(1.0)2
' = 51 sf
V = 150/51
V = 2.94 fps OK- nonerodible
Froude No. = Fr = v/(gy)o.5
Where y = hydraulic depth
y = cross sectional area of water divided by width of free water surface
g = acceleration due to gravity = 32.2 ft/sec2
y = 51 sf/(47 +4(1.0)) = 1.0 ft
Fr = 2.94/(32.2'1.0)0.5
' = 0.52 OK - Subcritical Flow
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I
IAppendix E
ICDPHE Stormwater Discharge Permit Application
I And
IStormwater Discharge Permit Certification
Permit No. COR03G682
I
I
I
I
I
I
I STATE OF COLORADO
I Bia Riper,Jr..Governor ,� caWF
Martha E.Rudolph,Executive Director
Dedicated to protecting and improving the health and environment of the people of Colorado y!
:1,'...." "' •
4300 Cherry Creek Dr S. Laboratory Services Division #
Denver.Colorado 80246-1530 8100 Lowry Blvd. �e
I Phone(303)692-2000 Denver,Colorado 80?30-6926
TOt)Line(303)691-7700 {303)692-3090 Colorado Department
Located in Glendale,Colorado of Public Health
hrp://www.cdphe.state co.us and Environment
IAugust 5,2010
Dale 5 Butcher,VP .
Conquest Oil Co
I 8207W20StSteB
Greeley,CO 80634
RE: Certification,Colorado Discharge Permit System
IPermit No.,COR030000,Certification Number:COR03G682
Dear Mr./Ms.Butcher;
I The Water Quality Control Division(the Division)has reviewed the application submitted for the Conquest C7 Produced Water
Treatment Facility facility and determined that it qualifies for coverage under the CDPS General Permit for Stormwater Discharges
Associated with Construction Activities(the permit).Enclosed please find a copy of the permit certification,which was issued under the
Colorado Water Quality Control Act.
IFacility:Conquest C7 Produced Water Treatment Facility Weld County
Construction Activities Commercial Development,
I Legal Contact(receives all legal documentation pertaining to the permit certification):
Dale S Butcher,VP Phone number:970-356-5560
Conquest Oil Co Email:jimgoddardl@yahoo.com
8207 W 20 St Ste B
I Greeley, CO 80634
Facility Contact(contacted for general inquiries regarding the facility):
Jim Goddard,GM Phone number:970-356-5560
Email:jimgoddardl@yahoo.com
I Billing Contact(receives the invoice pertaining to the permit certification):
Jim Goddard GM Phone number:970-356-5560
Conquest Oil Co Email:jimgoddardl@yahoo.com
I 8207 W 20 St Ste B
Greeley,CO 80634
Any changes to the contacts listed above must be provided to the Division on a Change of Contact form. This form is available on the
I Division's website at coloradowaterpermits.com.
The Annual Fee for this certification is$245.00 is invoiced every July.Do Not Pay This Now.The initial prorated invoice will be sent to
the legal contact shortly.
I Please read the enclosed permit and certification. If you have any questions please contact Matt Czahor, Environmental Protection
Specialist,at(303)692-3575.
Sincerely,
I .
I Debbie Jessop,Program Assistant
WATER QUALITY CONTROL DIVISION
Enclosures:Certification page;General Permit;Highlight Sheet;Termination form
I xc: Regional Council of Government
Weld County, Local County Health Department
D.E., Technical Services Unit,WQCD
Permit File /dkj cert
I
I
1
STATE CAF COLOFADO
' COLORADO DEPARTMENT OF PUBUC HEALTH AND ENVIRONMENT
o� cow
WATER OUALITY CONTROL DIVISION �ws'
TELEPHONE:(303) 692-3500
*876 `*
CERTIFICATION TO DISCHARGE
UNDER
COPS GENERAL PERMIT COR-0300000
' STORMWATER ASSOCIATED WITH CONSTRUCTION ACTIVITIES
Certification Number: COR03G682
This Certification to Discharge specifically authorizes:
Conquest Oil Co
to discharge stormwater from the facility identified as
Conquest C7 Produced Water Treatment Facility
' to:
-Crow Creek
Construction Activities : Commercial Development,
p ,
Facility Located at: County Rd 74 and SH 392, uninc Weld County, CO 00000
Latitude 40/31/30, Longitude -104/24/55
iCertification is effective: 8/3/2010 Certification Expires: 6/30/2012
1 This certification under the permit requires that specific actions be performed at designated times. The
certification holder is legally obligated to comply with all terms and conditions of the permit.
Signed,
•
1 Nathan Moore
Construction/MS4/Pretreatment Unit Manager
Water Quality Control Division
Page 1 of 22
I
HIGHLIGHTS
CONSTRUCTION ACTIVITY
STORMWATER GENERAL PERMIT
PERMIT REQUIREMENTS:
* Inspections: Inspection of stormwater management system
required at least every 14 days and after any precipitation or
snowmelt event that causes surface erosion. (See Inspections, page
12 of the permit, enclosed.)
' * Records: Records of inspections must be kept and be available for
review by the Division.
* Soormwater Management Plan (SWMP): A copy of the SWMP
must be kept on the construction site at all times.
PERMIT FEE:
t * Send payment only when you receive an invoice (sent once a year).
PERMIT TERMINATION AND TRANSFER:
* If the facility is finally stabilized, you may inactivate the permit,
using the enclosed Division form.
* "Final stabilization " is reached when all the construction is
complete, paving is finished, and the vegetation (grass, etc.) is
testablished, not just reseeded. See permit, page 9.
* If the entire site changes ownership, you should transfer the permit
to the new owner.
* If part of the site will be sold to a new owner, you will need to
' reassign permit coverage.
* Forms for these actions are available on our website, below. Also
see page 5 of the permit.
QUESTIONS?
* www.coloradowaterpermits.com
* Email cdphe.wqstorm@state.co.us
* Or call (303)692-3517, ask for Matt Czahor or Kathy Rosow
I
STATE OF COLODO
._ -
I Bill Ritter,Jr.,Governor
James B.Martin,Executive Director ��.of'ot° ,
Dedicated to protecting and improving the health and environment of the people of Colorado '..,T , .::.t. 6
I 4300 Cherry Creek Dr,S. Laboratory Services Division
Denver,Colorado 80246-1530 8100 Lowry Blvd. ,*.;:;_i„..11,:-,..i.e..**'
Phone(303)692-2000 Denver,Colorado 80230-6928 F
TDD Line(303)691-7700 (303)692-3090 Colorado Department
I Located in Glendale,Colorado
of Public Health
httq:/lwww.cdphe.slate.co us and Environment
I Colorado Water Quality Control Division Notice of Termination
Construction Stormwater Inactivation Notice
www.coloradowaterpermits.com
IPrint or type all information. All items must be filled out completely and correctly. If the form is not complete, it
will be returned. All permit terminations dates are effective on the date approved by the Division.
I ,:'1 tl `i.:!;::1•i:.a vt;t , Mg': '?iia„f:k'l ,:-4. i i 1 iiiiNi i Ai:i'It% "1'1,
I Colorado Dept of Public Health and Environment
Water Quality Control Division
4300 Cherry Creek Dr South,WQCD-P-92
IDenver,CO 80246-1530
_a:{i.:C; .OF: ENIA i'Lr, 1:r.)::•::MS `i,''!, !. r::. . :1 :CT i?TD,
• PERMIT Please write the permit certification number to be terminated
PART A. IDENTIFICATION OF R
IPermit Certification Number(four digits, not "0000"): COR03 ___. -
II . PART B. PERMITTEE INFORMATION
Company Name -----._____ - .
IMailing Address _
City State _ -- Zip code
illLegal Contact Name Phone number
Title Email
I • PART C. FACILITY/PROJECT INFORMATION
Facility/Project Name
ILocation(address) _
City ______-----___--- County --- Zip code
ILocal Contact Name Phone number
Title _ Email
Page 1 of 2 form last revised July 2009
I
COLORADO WATER QUALITY CONTROL DIVISION NOTICE OF TERMINATION www.coloradowateroermits.com
• PART D. TERMINATION VALIDATION CRITERIA
One of the criteria(1 or 2)below must be met, the appropriate box checked, and the required additional
information provided. Part E includes a certification that the criteria indicated has been met.
1: Finally Stabilized Or Construction Not Started-The permitted activities covered under the certification
listed in Part A meet the requirements for FINAL STABILIZATION in accordance with the permit,the Stormwater
Management Plan, and as described below. This criterion should also be selected if construction was never started and
no land was disturbed,and an explanation of this condition provided in the description below.
Final stabilization is reached when;all ground surface disturbing activities at the site have been completed including
removal of all temporary erosion and sediment control measure,and uniform vegetative cover has been established with
an individual plant density of at least 7O percent of predisturbance levels,or equivalent permanent,physical erosion
reduction methods have been employed.
REQUIRED for Criteria 1-Describe the methods used to meet the final stabilization c described above:
Include an attachment if additional space is required.
' -OR-
2: Separate Permit Coverage or Full Reassignment-All ongoing construction activities,including all disturbed
areas,covered under the permit certification listed in Part A have coverage under a separate CDPS stormwater
construction permit, including the permit certification issued when Division's Reassignment Form was used by the
permittee to reassign all areas/activities.
REQUIRED for Criteria 2—Provide the permit certification number covering the ongoing activities:
CORDS_ _ _ _
One of the two criteria above MUST BE CHECKED and the required information for that criterion provided,
STOP! or this form will not be processed and the permit will remain active.
• PART E. CERTIFICATION SIGNATURE (Required for all Termination Requests)
I understand that by submitting this notice of inactivation, I am no longer authorized to discharge stormwater associated with
construction activity by the general permit. I understand that discharging pollutants in stormwater associated with construction
activities to the waters of the State of Colorado,where such discharges are not authorized by a COPS permit, is unlawful under
' the Colorado Water Quality Control Act and the Clean Water Act.
I certify under penalty of law that I have personally examined and am familiar with the information submitted herein,and based
on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the information is true,
accurate and complete. I am aware that there are significant penalties for submitting false information,including the possibility
of fine and imprisonment. (See 18 U.S.C 1001 and 33 U.S.C. 1319.)
I also certify that tam a duly authorized representative of the permittee named in Part B.
Signature of Legally Responsible Party Date Signed
Name(printed) Title
Signatory requirements:This form shall be signed,dated,and certified for accuracy by the permittee In accordance with the following criteria:
1. In the case of a corporation,by a principal executive officer of at least the level of vice-president,or his or her duly authorized representative,if such
representative is responsible for the overall operation of the operation from which the discharge described herein originates;
2. In the case of a partnership,by a general partner;
3. In the case of a sole proprietorship, by the proprietor;
4. In the case of a municipal,state,or other public operation,by wither a principal executive officer,ranking elected official,or other duly authorized
employee.
Page 2 of 2 form last revised July 2009
' Page 2 of 22
Permit No. COR-030000
CDPS GENERAL PERMIT
STORMWATER DISCHARGES ASSOCIATED WITH
CONSTRUCTION ACTIVITY
AUTHORIZATION TO DISCHARGE UNDER THE
COLORADO DISCHARGE PERMIT SYSTEM
In compliance with the provisions of the Colorado Water Quality Control Act,(25-8-101 et seq., CRS, 1973
as amended)and the Federal Water Pollution Control Act,as amended(33 U.S.C. 1251 et seq.; the "Act"),
this permit authorizes the discharge of stormwater associated with construction activities(and specific
j allowable non-stormwater discharges in accordance with Part I.D.3 of the permit)certified under this permit,
from those locations specified throughout the State of Colorado to specified waters of the State. Such
discharges shall be in accordance with the conditions of this permit.
This permit specifically authorizes the facility listed on page 1 of this permit to discharge,as of this date, in
accordance with permit requirements and conditions set forth in Parts I and II hereof. All discharges
authorized herein shall be consistent with the terms and conditions of this permit.
This permit and the authorization to discharge shall expire at midnight, June 30, 2012.
' Issued and Signed this 31"' day of May. 2007
' COLORADO DEPARTMENT OF PUBLIC IIEALTII AND ENVIRONMENT
I •
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Janet S. K icier
Permits Section Manager
Water Quality Control Division
SIGNED
AND ISSUED MAY 31, 2007
EFFECTIVE JULY 1, 2007
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I
TABLE OF CONTENTS
I
PAR('I
A. COVERAGE UNDER THIS PERMIT 3
I I. Authority to Discharge 3
a) Applicable Sections 3
h) Oil and()as Construction 3
I 2. Definitions 3
3, Permit('overage Without Application-Qualifying local Programs 3
a) Applicable Sections 3
b) Local Agency Authority 4
I c) Permit('overage Termination 4
d) Compliance with Qualifying Local Program 4
c) Full Permit Applicability 4
4, Application.Due Dates 4
I a) Application Due Dates 4
b) Summary of Application 4
5, Pcnnit Certification Procedures 4
I a) Request for Additional Information 4
h) Automatic Coverage S
c) Individual Permit Required 5
d) General vs.Individual Permit Coverage 5
I c) Local Agency Authority 5
G. Inactivation Notice S
7. Transfer of Permit 5
)i. Reassignment of Permit 5
I 9. Sale of Residence to Homeowners 6
10. Permit Expiration Date 6
I I. Individual Permit Criteria 6
IH. STORMWATER MANAGEMENT PLAN-GENERAL REQUIREMENTS 6
C. STORM WATER MANAGEMENT PLAN CONTENTS 7
I I. Site Description 7
2. Site Map 7
3. Stonnwatcr Management("ontrnls 8
a) SWMP Administrator K
I b) identification of Potential Pollutant Sources x
c) Best Management Practices OWN for Storntwatcr Pollution Prevention, 8
4. Final Stabilization and Long-term Stonnwater Management 9
I5. Inspection and Maintenance it)D. TERMS AND CONDITIONS itl
1. General Limitations It)
I 2. BMP Implementation and Design Standards I U
3, Prohibition of Non-Stonnwater Discharges ! I
4. Releases in Excess of Reportable Quantities I I
5. SWMP Requirements I 1
I a) SWMP Preparation and Implementation 1 I
h) SWMP Retention Requirements I i
c) SWMP Review/Changes i I
I
d) Responsive SWMP Changes 12
6. Inspections 12
a) Minimum Inspection Schedule 12
h) Inspection Requirements 13
I c) Required Actions Following Site Inspections 13
7. 13 4P Maintenance I3
K. Replacement and Failed HMI's 14
9. Reporting 14
I
I
' 2a-
TARLE OF CONTENTS(cont.)
10. SWMP Availability I4
II,. Total Maximum Daily Load(Tfv1DL) 14
E. ADDITIONAL DEFINITIONS I5
I F. GENERAL REQUIREMENTS 16
I. Signatory Requirements 16
2. Retention of Records 16
I 3. Monitoring 16
PART II
I A. MANAGEMENT REQUIREMENTS 17
I. Amending a Permit Certification 17
2. Special Notifications-Definitions 17
Noncompliance Notification 17
Ii.4. Submission of Incorrect or incomplete Information 18
5. Bypass 18
6. Upsets 18
I 7. Removed Substances 2; 18
. Minimization of Adverse Impact 18
9. Reduction,Loss,or Failure of Stonnwatcr Controls 19
ID. Proper Operation and Maintenance 19
1 B. RESPONSIBILITIES 19
1. Inspections and Right to Entry 1')
2. Duly to Provide Information 19
I 3. Transfer of Ownership or Control 19
4. Modification,Suspension,or Revocation of Permit By Division 20
5. Permit Violations 21
I 6. Legal Responsibilities 21
7. Severability 21
8. Renewal Application 21
9. Confidentiality 21
I 10. Fees 21
11. Requiring an Individual CDPS Permit 22
I
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-2b-
1
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I .
PART I
' Permit Page
Permit No. (OR-030000
PART 1
A. COVERAGE UNDER THIS PERMIT
1. Authority to Disagree
' Under this permit, facilities are granted authorization to discharge stormwater associated with construction activities into
waters of the state of Colorado.This permit also authorizes the discharge of specific allowable non-stormwater discharges.
in accordance with Part 1.1).3 oldie permit,which includes discharges to the ground.This includes stornwater discharges
' from areas that are dedicated to producing earthen materials.such as soils.sand and gravel, tbr use at a single construction
site(i.e.,borrow or till areas). This permit also authorize stormwater discharges from dedicated asphalt batch plants and
dedicated concrete batch plants. (('overage under the construction site permit is not required for hatch plants if they have
alternate C'l.)1'S permit coverage.) This permit does not authorize the discharge of mine water or process water front such
areas.
al Applicable Sections; In accordance with Part I.A.3 of this permit,some parts of this permit do not apply to sites
covered)under a Qualifying Local Program,as defined in I.A.2.d. For sites not covered by a Qualifying Local
' Program.all parts cif the permit apply except Pan 1.A.3. The permittce will be responsible for determining and then
complying with the applicable sections.
' h) Oil and Gas Construction: Stormwater discharges associated with construction activities directly related to oil and
gas exploration.production,processing,and treatment operations or transmission facilities are regulated under the
Colorado Discharge Permit System Regulations 1.5CCR 1002-61).and require coverage under this permit in
accordance with that regulation. However,references in this permit to specific authority under the Federal Clean
' Water Act(CWA)do not apply to stormwater discharges associated with these oil and gas related construction
activities.to the extent that the references arc limited by the federal Energy Pulley Act of 2005.
2. Definitions
at) Stormwater:Stormwater is precipitation-induced surt;tce rumour.
' h) Construction activity: Construction activity refers to ground surface disturbing activities,which include,but are
nut limited to,clearing,grading,excavation,demolition,installation of'new or improved haul roads and access
roads,staging areas.stockpiling of fill materials,and borrow areas,Construction does not include routine
maintenance to maintain original line and grade,hydraulic capacity,or original purpose of the facility.
' c) Small construction activity: Stormwater discharge associated with small construction activity means the discharge
of stormwater from construction activities that result in land disturbance of equal to or greater than one acre and less
than live acres.Small construction activity also includes the disturbance of less than one acre of total land area that
is part of a larger common plan of development or sale, if the larger common plan will ultimately disturb equal to or
greater than one and less than live acres.
d) Qualifying Local Program: This permit includes conditions that incorporate qualifying local erosion and sediment
control program(Qualifying Local Program)requirements by reference. A Qualifying Local Program is a municipal
stormwater program for stotmtwatcr discharges associated with small construction activity that has been formally
approved by the Division,
' Other Definitions: Definitions of additional terms can he found in Part I.!:.of this permit.
?. Permit Coverage Without Aoplicatinn- fur small construction activities under a Qualifying Local Program only
' If a small construction site is within the jurisdiction ofa Qualifying Local Program.the operator of the construction
activity is authorized to discharge stormwater associated with small construction activity under this general permit without
the submittal ofan application to the Division.
' a) Applicable Sections: For sites covered by a Qualifying Local Program.only Parts 1.A.1, I.A.2, I.A.3. LD.I. I.D.2.
1.D.7,I,1).8,1.1).1 I,LE and Part II of this permit.with the exception of Parts II.A,1.11.8.3, II.B.8.and
' 11.1310,apply.
I
PART 1
' Permit- Page 4
Permit No.COR-030000
A. COVERAGEUNDER "PHIS PERMIT(cont.)
b) Local Agency Authority: This permit does not pre-empt or supersede the authority of local agencies to prohibit.
restrict,or control discharges of stormwater to storm drain systems or other water courses within their.jurisdiction.
c) Permit Coverage Termination: When a site under a Qualifying Local Program has been finally stabilized.
coverage under this permit is automatically terminated.
d1 Compliance with Qualifying Local Program: A construction site operator that has authorization to discharge
' under this permit under Part LA,3 shall comply with the requirements of the Qualifying Local Program with
jurisdiction over the site.
c) Full Permit Applicability: The Division may require any operator within the jurisdiction of a Qualifying Local
Program covered under this permit to apply for and obtain coverage under the full requirements of this permit The
operator must be notified in writing that an application for full coverage is required. When a permit certification
under this permit is issued to an operator that would otherwise he covered under Part LA.3 of this permit,the full
requirements of this permit replace the requirements as per Part I.A.3 of this permit.upon the effective date of the
permit certification. A site brought under the full requirements of this permit must still comply with local
stormwater management requirements,policies or guidelines as required by Part I.D.I.g of this permit.
' 4. Application.Due Dates
a) Application Due Dates: At least ten calendar days prior to the commencement of construction activities.the
applicant shall submit an application form as provided by the Division,with a certification that the Stormwater
' Management Plan(SWMP)is complete.
One original completed discharge permit application shall he submitted,by mail or hand delivery.to:
' Colorado Department of Public Health and Environment
Water Quality Control Division
WQCD-Permit,-lit
' 4300 Cherry Creek Drive South
Denver,Colorado 80246-1530
h) Summary of Application: The application requires,at a minimum, the following:
' I) The applicant's company name;address:telephone number:and email address(if available):whether the
applicant is the owner,developer,or contractor:and local contact information:
' 2) Project name,address,county and location of the construction site, including the latitude and longitude to the
nearest 15 seconds of the approximate center of the construction activity:
3) Legal description or map of the construction site:
4) Estimates of:: the total area of the site,the area of the site that is expected to he disturbed,and the total area of
' the larger common plan of development or sale to undergo disturbance:
5) The nature of the construction activity:
6) The anticipated start date and final stabilization date for the project:
7) The name of the receiving water(s),or the municipal separate storm sewer system and the ultimate(i.e.,named)
' receiving water(s):
fl) Certification that the SWMP fur the construction site is complete(see Part LC.below):and
9) The signature of the applicant,signed in accordance with Part I,F.I of this permit.
5. Permit Certification Procedures
If this general permit is appropriate for the applicant's operation,then a certification will he developed and the applicant
' will he authorized to discharge stormwater under this general permit.
a) Request for Additional Information: The Division shall have up to ten calendar days after receipt of the above
information to request additional data and/or deny the authorization for any particular discharge. Upon receipt of
' additional information,the Division shall have an additional ten calendar days to issue or deny authorization for
the particular discharge. (Notification of denial shall be by letter,in cases where coverage under an alternate general
permit or an individual permit is required.instead of coverage under this permit.)
1
PART I
' Permit-Page 5
,
Permit No.COR-030000
A. COVER At1E UNDER THIS PERMIT(coat)
' b) Automatic Coverage: if the applicant does not receive a request for additional information or a notification of
denial from the Division dated within ten calendar days of receipt of the application by the Division.authorization to
discharge in accordance with the conditions of this permit shall be deemed granted.
' c) individual Permit Required: IL oiler evaluation ol'the application(or additional information,such as the SWMP),
it is found that this general permit is nut appropriate fur the operation,then the application will be processed as one
1ur an individual permit. The applicant will be notified(lithe Division's decision to deny certification under this
' general permit. For an individual permit,additional information may be requested,and 180 days may be required to
process the application and issue the permit. At the Division's discretion,temporary coverage under this general
permit may be allowed until the individual permit goes into erred.
' d) General vs.Individual Permit('overage: Any p ermiucc authorized by this permit may request to be excluded
from the coverage of this permit hy'applying for an individual C'DPS permit. The permitted shall submit an
individual application,with reasons supporting the request,to the Division at least 180 days prior to any discharge.
' cl Local Agency Authority: This permit does not pre-empt or supersede the authority of local agencies to prohibit,
restrict,or control discharges of stormwater to storm drain systems or other water courses within their jurisdiction.
(i. inactivation Notice
When a site has been finally stabilized in accordance with the SWMP,the permitter must submit an inactivation Notice
form that is signed in accordance with Part I.F.1.of this permit. The Inactivation Notice form is available from the
Division and includes:
a) Permit certification number;
h) The permittee's name.address.telephone number;
' c1 Name,location,and county for the construction site for which the inactivation notice is being submitted;and
d) Certification that the site has been finally stabilized,and a description(tithe final stabilization method(s).
' 7. Transfer of Permit
When responsibility for stormwater discharges at a construction site changes from one entity to another,the permittee shall
submit a completed Notice of Transfer and Acceptance of Terms form that is signed in accordance with Part I.F.I.of
' this permit. The Notice of Transfer form is available from the Division and includes:
a) Permit certification number;
b) Name,location,and county for the construction site for which the Notice of Transfer is being submitted:
c) Identifying information tor the new pennittee;
d) Identifying information for the current permittce:and
c) Effective date of transfer.
' If the new responsible party will not complete the transfer form,the permit may he inactivated upon written request to the
Division and completion of the Inactivation Notice if the permitted has no legal responsibility.through ownership or
contract,for the construction activities at the site. In this case,the new owner or operator would be required to obtain
permit coverage separately.•8. Reassignment of Permit
When a permitter no longer has control of a specific portion of a permitted site,and wishes to transfer coverage of that
portion of the site to a second party,the perrnittec shall submit a completed Notice of Reassignment of Permit Coverage
form that is signed in accordance with Part I.F.1.of this permit.The Notice of Reassignment of Permit Coverage form is
' available from the Division and includes:
a) Current permit certification number;
h) identifying information and certification as required by Part I.A.4.b for the new permitter;
' c) Identifying information for the current per-mince,revised site information and certification fur reassignment;and
d) Effective date of reassignment.
PART I
Permit- Page 6
Permit No. COR-030000
A. COVERAGE UNDER THIS PERMIT(cons.)
If the new responsible party will not complete the reassignment form,the applicable portion of the permitted site may be
removed from permit coverage upon written request to the Division if the permittee has no legal responsibility,through
ownership or contract, for the construction activities at the portion of the site. In this case,the new owner or operator
would be required to obtain permit coverage separately.
9. Sale of Residence to Romeowners
For residential construction only,when a residential lot has been conveyed to a homeowner and all criteria in paragraphs
a through e,below,are met,coverage under this permit is no longer required and the conveyed lot may be removed from
coverage wider the permittee's certification. Al such time,the perntittee is no longer responsible for meeting the terms and
conditions of this permit for the conveyed lot,including the requirement to transfer or reassign permit coverage. The
permittee remains responsible for inactivation of the original certification.
a) The lot has been sold to the homeowners)for private residential use;
b) the lot is less than one acre of disturbed area;
c) all construction activity conducted by the permittee on the lot is completed;
d) a certificate of occupancy(or equivalent)has been awarded to the home owner: and
e) the SWMP has been amended to indicate the lot is no longer covered by permit.
Lots not meeting all of the above criteria require continued permit coverage. I lowever,this permit coverage may be
transferred(Part i.A.7,above)or reassigned(Part I.A.$,above)to a new owner or operator.
10. Permit Expiration Date
Authorization to discharge under this general permit shall expire on June 30,2012. The Division must evaluate and
reissue this general permit at least once every five years and must recertify the permittee's authority to discharge under the
general permit at such time. Therefore.a permittee desiring continued coverage under the general permit must reapply by
March 31,2012. The Division will initiate the renewal process; however, it is ultimately the permittee's responsibility to
ensure that the renewal is submitted. The Division will determine if the permittee may continue to operate under the terms
of the general permit. An individual permit may he required for any facility not reauthorized to discharge under the
reissued general permit.
1 t. Individual Permit Criteria
Various criteria can be used in evaluating whether or not an individual(or alternate general)permit is required instead of
this general permit. This information may come from the application,SWMP,or additional information as requested by
the Division,and includes,but is not limited to,the following:
a) the quality of the receiving waters(i.e., the presence of downstream drinking water intakes or a high quality fishery,
or for preservation of high quality water);
h) the size of the construction site:
c) evidence of noncompliance under a previous permit for the operation;
d) the use of chemicals within the stormwater system;or
e) discharges of pollutants of concern to waters for which there is an established Total Maximum Daily Load(TMDL).
In addition,an individual permit may be required when the Division has shown or has reason to suspect that the
stormwater discharge may contribute to a violation of a water quality standard.
R. STORM WATERMANAGEMENTPLAN (SWMP)—GENERALREQUIREMENTS
I. A SWMP shall he developed for each facility covered by this permit. The SWMP shall he prepared in accordance with
good engineering,hydrologic and pollution control practices. (The SWMP need not be prepared by a registered engineer.)
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PART I
' I'crntit Page 7
Permit No.C'OR-030f)00
R. STORMWATER MANAGEMENT PLAN(SWMP) GENERAL. REQuIRI LEN FS(cont.)
2. The SWMP shall:
a) Identify all potential sources of pollution which may reasonably be expected to affect the quality of storm water
discharges associated with construction activity from the facility;
' b) Describe the practices to be used to reduce the pollutants in stormwatcr discharges associated with construction
activity at the facility;and ensure the practices are selected and described in accordance with good engineering
practices,including the installation.implementation:and maintcnancerequirements;and
c) Re properly prepared.and updated in accordance with Part I.D.5.c,to ensure compliance with the terms and
conditions of this permit.
1 3. Facilities must implement the provisions of the SWMP as written and updated. from commencement of construction activity
until final stabilization is complete,as a condition of this permit. The Division reserves the right to review the SWMP,and
to require the permitter to develop and implement additional mcisures to prevent and control pollution as needed.
4. The SWMP may reflect requirements for Spill Prevention Control and Countermeasure(SPCC)plans under section 311 of
the('WA,or Rest Management Practices(RMPs)Programs otherwise required by a separate CDPS permit,and may
incorporate any part of such plans into the SWMP by reference,provided that the relevant sections of such plans are
available as part of the SWMP consistent with Part
5. For any sites with permit coverage before June 30,2007,the permittec's SMWP must meet the new SWMP requirements as
' summarized in Section II.I of the rationale. Any needed changes must be made by October 1,2007.
C. STORMWATER MANAGEMENT PLAN(SWMP) CONTENTS
The SWMP shall include the following items,at a minimum.
I. Site Description. The SWMP shall clearly describe the construction activity.to include:
a) The nature of the construction activity at the site.
b) The proposed sequence for major activities.
c) Estimates of the total area of the site,and the area and location expected to be disturbed by clearing,excavation,
t grading,or other construction activities.
d) A summary of any existing data used in the development ot'the site construction plans or SWMP that describe the
soil or existing potential for soil erosion.
c) A description of the existing vegetation at the site and an estimate of the percent vegetative ground cover.
t) The locution and description ofall potential pollution sources,including ground surface disturbing activities(see
Part 1.A.2.b),vehicle fueling,storage of fertilizers or chemicals.etc.
gi The location and description of any anticipated allowable sources of non-stotmwnter discharge at the site,e.g..
uncontaminated springs, landscape irrigation return flow,construction dcwatering,and concrete washout.
h) The name of the receiving water(s)and the size,type and location of any outfall(s). lithe stormwater discharge is to
n municipal separate storm sewer system,the name of that system,the location of the storm sewer discharge,and the
ultimate receiving water(s).
2. Site Man. The SWMP shall include a legible site map(s),showing the entire site,identifying:
a) construction site boundaries;
h) all areas of ground surface disturbance;
c) areas of cut and fill;
d) areas used for storage of building materials,equipment,soil,or waste;
e) locations of dedicated asphalt or concrete batch plants;
' t) locations of all structural BMPs;
g) locations of non-structural BMPs as applicable:and
h) locations of springs.streams.wetlands and other surface waters.
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PART I
' Permit- Pave tt
Permit No.i OR-tl3(tUC)f)
C. STORMWATER MANM PMF.NT PLAN (SWMP) -CONTENTS (coot.)
3. Stormwater Management Controls.
The SWMP must include a description of all stormwatcr management controls that will be implemented as part of the
construction activity to control pollutants in stonnwatcr discharges. The appropriateness and priorities of stormwater
' management controls in the SWMP shall reflect the potential pollutant sources identified at the facility.
The description of stormwatcr management controls shall address the Hollowing components,at a minimum:
a) SWMP Administrator-The SWMP shall identify a specific individual(s),position or title who is responsible for
developing.implementing.maintaining,and revising the SWMP. The activities and responsibilities of the
administrator shall address all aspects of the facility's SWMP.
' h) Identification of Potential Pollutant Sources-All potential pollutant sources,including materials and activities,at
a site must be evaluated for the potential to contribute pollutants to stonnwatcr discharges. 1 he SWMP shall
identify and describe those sources determined to have the potential to contribute pollutants to stormwater
' discharges.and the sources must he controlled through LIMP selection and implementation.as required in paragraph
(c),below.
At a minimum,each of the following sources and activities shall be evaluated for the potential to contribute
pollutants to stormwater discharges,and identified in the SWMP if found to have such potential:
1) all disturbed and stonxi soils;
2) vehicle tracking of sediments;
3) management of contaminated soils;
4) loading and unloading operations:
5) outdoor storage activities(building materials,fertilizers,chemicals,etc.):
' 6) vehicle and equipment maintenance and fueling;
7) significant dust or particulate generating processes;
K) routine maintenance activities involving fertilizers.pesticides,detergents.fuels.solvents,oils,etc.;
9) on-site waste management practices(waste piles.liquid wastes,dumpsters,etc.):
10) concrete truck/equipment washing_ including the concrete truck chute and associated fixtures and equipment;
11) dedicated asphalt and concrete batch plants;
12) non-industrial waste sources such as worker trash and portable toilets;and
' 13) other areas or procedures where potential spills can occur,
c) Best Management Practices(BM Ps)for Stormwater Pollution Prevention-1'he SWMP shall identify and
describe appropriate BMPs,including,but not limited to,those required by paragraphs I through 8 below,that will
be implemented at the facility to reduce the potential of the sources identified in Part I.C.3,b to contribute pollutants
to stormwater discharges. The SWMP shall clearly describe the installation and implementation specifications for
each BMP identified in the SWMP to ensure proper implementation,operation and maintenance of the BMP.
tI) Structural Practices for Erosion and Sediment Control. The SW MP shall clearly describe and locate all
structural practices implemented at the site to minimize erosion and sediment transport. Practices may include,
but are not limited to:straw bales,wattles/sediment control logs,silt fences,earth dikes,drainage swales,
' sediment traps,subsurface drains,pipe slope drains,inlet protection,outlet protection,gahions,and temporary
or permanent sediment basins.
' 2) Non-Structural Practices for Erosion and Sediment Conttol.. The SWMP shall clearly describe and locate,as
applicable,all non-structural practices implemented at the site to minimize erosion and sediment transport.
Description must include interim and permanent stabilization practices,and site-specific scheduling t'or
implementation of the practices. The SWMP should include practices to ensure that existing vegetation is
preserved where possible. Non-structural practices may include,but are not limited to: temporary vegetation.
permanent vegetation,mulching.geotextilcs,sod stabilization,slope roughening,vegetative buffer strips.
protection of trees,and preservation of mature vegetation.
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PART I
Permit-Page 9
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Permit No.C'OR-030000
C. STORMWA'Ii R MANAGEMENT PLAN(SWMP) -CONTENTS (amt.)
3) Phased IiMP Implementation. The SWMP shall clearly describe the relationship between the phases of
construction,and the implementation and maintenance of both structural and non-structural stormwatcr
management controls. The SWMP must identify the stormwatcr management controls to be implemented
during the project phases,which can include.hut are not limited to.clearing and grubbing;road construction;
utility and infrastructure installation;vertical construction:final grading;and final stabilization.
4) Materials Handling and Spill Prevention. The SWMP shall clearly describe and locate all practices
implemented at the site to tninimiie impacts !ruin procedures ur significant materials(see definitions at Part
i.E.)that could contribute pollutants to runoff. Such procedures or significant materials could include:exposed
storage of building materials;paints and solvents;fertilizers or chemicals;waste material;and equipment
maintenance or fueling procedures.
Areas or procedures where potential spills can Occur must have spill prevention and response procedures
identified in the SWMP.
5) Dedicated Concrete or Asphalt klatch Plants. The SW MI' clearly describe and locate all practices
implemented at the site to control stormwater pollution from dedicated concrete batch plants or dedicated
asphalt batch plants covered by this certification.
' b) Vehicle Tracking Control. "Ilse SWMP shall clearly describe and locate all practices implemented at the site to
control potential sediment discharges from vehicle tracking. Practices must be implemented for all areas of
potential vehicle tracking.and can include:minimizing site access:street sweeping or scraping;tracking pads;
graveled parking areas:requiring that vehicles stay on paved areas nn-site;wash racks;contractor education;
andior sediment control HMPs,etc.
7) Waste Management anal Disposal.including Concrete Washout.
' i) The SW MP shall clearly describe and locate the practices implemented at the site to control stormwatcr
pollution from all construction site wastes(liquid and solid),including concrete washout activities.
ii) The practices used for concrete washout must ensure that these activities do not result in the contribution
of pollutants associated with the washing activity to stormwater runoff.
iii) Part 1.D.3.e of the permit authorizes the conditional discharge of concrete washout water to the ground.
The SWMP shall clearly describe and locate the practices to be used that will ensure that no washout
water from concrete washout activities is discharged from the site as surface runoff or to surface waters.
8) Urocuidlwater and Stormwater I)ewaterim.
it The SWMP shall clearly describe and locate the practices implemented at the site to control stormwater
pollution front the dewatcring of gmundwater or stormwater troth excavations,wells,etc.
ii) Part I.D.3.d of the permit authorizes the conditional discharge of construction dewatcring to the ground.
' For any construction dewatcring of groundwater not authorized under a separate C'DPS discharge permit,
the SWMP shall clearly describe and locate the practices to he used that will ensure that no groundwater
from construction dewatcring is discharged from the site as surface runoff or to surface waters.
1 4. Final Stabilization and Lona-term Stormwater Munattement
u) The SWMP shall clearly describe the practices used to achieve final stabilisation of all disturbed areas at the site,
and any planned practices to control pollutants in stummwater discharges that will occur after construction operations
' have been completed at the site.
h) Final stabilization practices for obtaining a vegetative cover should include,as appropriate:seed mix selection and
application methods:soil preparation and amendments;soil stabilization practices(e.g.,crimped straw.hydro mulch
1 or rolled erosion control products):and appropriate sediment control tiMPs as needed until final stabilization is
achieved:etc.
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PAM I
Permit - Page It)
Permit No.COR-030000
(• STORMWATI:R MANAGEMENT PLAN(SWMP) CONTENTS (cunt.)
' c) Final stabilization is reached when all ground surface disturbing activities at the site have been completed.and
uniform vegetative cover has been established with an individual plant density of at least 70 percent of pre-
disturbance levels,or equivalent permanent.physical erosion reduction methods have been employed.
The Division may.after consultation with the permittee and upon good cause,amend the final stabilization criteria in this
section for specific operations.
5. Inspection and Maintenance
Part LD.C,oldie permit includes requirements for site inspections. Part I.D.7 of the permit includes requirements for BMP
maintenance. The SWMP shall clearly describe the inspection and maintenance procedures implemented at the site to
maintain all erosion and sediment control practices and other protective practices identified in the SWMP, in good and
eflectivc operating condition.
D. TERMS AND CONDITIONS
1. General Limitations
lhe'Wowing limitations shall apply to all discharges covered by this permit:
t
a) Stonnwater discharges from construction activities shall nut cause,have the reasonable potential to cause,or
measurably contribute to an exccedancc of any water quality standard, including narrative standards for water
quality.
b) Concrete washout water shall not he discharged to state surface waters or to stoma sewer systems. On-site
permanent disposal of concrete washout waste is not authorized by this permit. Discharge to the ground of concrete
washout waste that will subsequently be disposed of of site is authorized by this permit. See Part I.D.3.c of the
permit.
c) Bulk storage structures for petroleum products and any other chemicals shall have secondary containment or
equivalent adequate protection so as to contain all spills and prevent any spilled material from entering State waters.
d) No chemicals are to be added to the discharge unless permission for the use of a specific chemical is granted by the
Division. In granting the use of such chemicals.special conditions and monitoring may be addressed by separate
correspondence.
c) The Division reserves the right to require sampling and testing,on a case-by-case basis,in the event that there is
reason to suspect that compliance with the SWMP is a problem,or to measure the effectiveness of the BMPs in
removing pollutants in the effluent. Such monitoring may include Whole Effluent Toxicity testing.
' I) All site wastes must be properly managed to prevent potential pollution of State waters. This permit does not
authorize on-site waste disposal.
g) All dischargers must comply with the lawful requirements of federal agencies,municipalities,counties,drainage
districts and other local agencies regarding any discharges of stormwater to storm drain systems or other water
courses under their jurisdiction,including applicable requirements in municipal stonnwater management programs
developed to comply with C'l)PS permits. Dischargers must comply with local stormwater management
• requirements.policies or guidelines including erosion and sediment control.
t� 2. BMP Implementation and Design Standards
' Facilities must select.install, implement,and maintain appropriate BMPs,following good engineering,hydrologic and
pollution control practices. BMPs implemented at the site must be adequately designed to provide control for all potential
pollutant sources associated with construction activity to prevent pollution or degradation of State waters.
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PART 1
' Permit-Page I 1
Permit No.COR-030000
D. TERMS AND CONDITIONS(cont.)
' 3. Prohibition of Non-Stormwater Discharges
a) Except as provided in paragraphs h,c,and d below,all discharges covered by this permit shall he composed
entirely of stormwater associated with construction activity. Discharges of material other than stormwater must
' he addressed in a separate MPS permit issued for that discharge.
h) Discharges from the following sources that are combined with storniwater discharges associated with construction
' activity may be authorized by this permit,provided that the non-stor mwater component of the discharge is identified
in the SWMP(see Part I.C'.I.g of this permit):
-emergency tire fighting activities -landscape irrigation return flow
-uncontaminated springs
c) Discharges to the ground of concrete washout water front washing of tools and concrete mixer chutes may be
authorized by this permit,provided that:
l) the source is identified in the SWMP:
2) BMPs are included in the SWMP in accordance with Part I.C.3(c)(7)and to prevent pollution of groundwater in
' violation of Part I.D.l.a:and
3) these discharges do not leave the site as surface runof for 10 surface waters
d) Discharges to the ground ot'water from construction dewatering activities may be authorized by this permit.
' provided that:
1) the source is groundwater and/or groundwater combined with stormwater that does not contain pollutants in
concentrations exceeding the State groundwater standards in Regulations 5 CCR 1002-41 and 42:
2) the source is identified in the SWMP:
3) liMPs are included in the SWMP,as required by Part I.C'.3tcft)t):and
4) these discharges do not leave the site as surface runoff or to surface waters.
Discharges to the ground from construction dewatering activities that do not meet the above criteria must be covered
under a separate CDPS discharge permit. Contaminated groundwater requiring coverage under a separate CDPS
discharge permit may include groundwater contaminated with pollutants from a landfill,mining activity,industrial
pollutant plume.underground storage tank,or other source.
4. Releases in Excess of Reportable Quantities
' This permit does not relieve the permittee ot'the repo»ling requirements of 40 CFR 110,40 CFR 1 t 7 or 40 CFR 302. Any
discharge of hazardous material must he handled in accordance with the Division's Noncompliance Notification
Requirements(see Part 11.A.3 of the permit).
' 5. SWMP Requirements
a) SWMP Preparation and Implementation: 'the SWMP shall he prepared prior to applying for coverage under the
I general permit.and certification of its completion submitted with the application. The SWMI'shall be implemented
prior to commencement of construction activities. The plan shall be updated as appropriate(see paragraph C.
below),below).SWMP provisions shall he implemented until expiration or inactivation of permit coverage.
' b) SWMP Retention Requirements: A copy of the SWMP must be retained on site unless another location.specified
by the permitter,is approved by the Division.
' c) SWMP Review/Changes: The penuittee shall amend the SWMP:
I) when there is a change in design,construction,operation.or maintenance of the site,which would require the
implementation of new or revised l3MPs:or
' 2) if the SWMP proves to he ineffective in achieving the general objectives of controlling pollutants in stormwater
discharges associated with construction activity:or
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PART I
I Permit- Page 12
Permit No.COR-030000
D. TERMS AND CONDITIONS(cont.)
1
3) when BMPs are no longer necessary and are removed.
SWMP changes shall be made prior to changes in the site conditions,except as allowed for in paragraph d,below.
SWMP revisions may include,but arc not limited to: potential pollutant source identification;selection of
appropriate BMPs for site conditions;LIMP maintenance procedures;and interim and final stabilization practices.
The SWMP changes may include a schedule I'or further[IMP design and implementation,provided that,if any
interim BMPs are needed to comply with the permit,they are also included in the SWMP and implemented during
Ithe interim period.
dl Responsive SWMP Changes: SW MI'changes addressing LIMP installation and/or implementation arc often
required to be made in response to changing conditions.or when current IIMPs arc determined ineffective. The
I majority of SWMP revisions to address these changes can be made immediately with quick in-the-field revisions to
the SWMP. In the less common scenario where more complex development of materials to modify the SWMP is
necessary.SWMP revisions shall be made in accordance with the following requirements:
I I) the SWMP shall be revised as soon as practicable,hut in no case more than 72 hours after the changc(s)in
BMP installation and/or implementation occur at the site,and
I 2) a notation must be included in the SWMP prior to the site change(s)that includes the time and date of the
change(s)in the field,an identification of the IIMP(s)removed or added,and the loeation(s)of those BMP(s).
6. inspections
ISite inspections must be conducted in accordance with the following requirements and minimum schedules. The required
minimum inspection schedules do not reduce or eliminate the permittce's responsibility to implement and maintain BMPs
I in good and effu.tivc operational condition,and in accordance with the SWMP,which could require more frequent
inspections.
a) Minimum Inspection Schedule: The permitter shall,at a minimum,make a thorough inspection,in accordance
i with the requirements in I.D.6.b below,at least once every 14 calendar days. Also,post-storm event inspections
must be conducted within 24 hours after the end of any precipitation or snowmclt event that causes surface erosion.
Provided the timing is appropriate,the post-storm inspections may be used ro fulfill the I4-day routine inspection
requirement. A more frequent inspection schedule than the minimum inspections described may he necessary,to
ensure that BMPs continue to operate as needed to comply with the permit. The following conditional modifications
to this Minimum Inspection Schedule arc allowed:
I) Post-Storm F.vent Inspections at Temporarily Idle Sites If no construction activities will occur following a
storm event,post-storm event inspections shall be conducted prior to re-commencing construction activities,
I but no later than 72 hours following the storm event. The occurrence of any such delayed inspection must be
documented in the inspection record. Routine inspections still must be conducted at least every 14 calendar
1 days.
2) Inspections at Completed Sites/Arcas For sites or portions of sites that meet the following criteria.but final
stabilization has not been achieved due to a vegetative cover that has not become established,the permitter
I shall make a thorough inspection of their storntwater management system at least once every month,and post-
storm event inspections are not required. This reduced inspection schedule is only allowed if:
i i) all construction activities that will result in surface ground disturbance are completed;
ii) all activities required for final stabilization,in accordance with the SWMP,have been completed.with
the exception of the application of seed that has not occurred due to seasonal conditions or the necessity
for additional seed application to augment previous etii►rts;and
I iii) the SWMP has been amended to indicate those areas that will he inspected in accordance with the
reduced schedule allowed for in this paragraph.
PART I
Permit-Page 13
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Permit No.C'OR-030000
D. TERMS AND CONDITIONS(cont.)
1 3) Winter Conditions Inspections Exclusion Inspections are not required at sites where construction activities
arc temporarily halted,snow cover exists over the entire sue for un extended period.and melting conditions
posing a risk of surface erosion do not exist. This exception is applicable only during the period where melting
conditions do not exist,and applies to the routine 14-day and monthly inspections,as well as the post-storm-
event inspections. The following information must be documented in the inspection record for use of this
exclusion:dates when snow cover occurred.date when construction activities ceased,and dale melting
conditions began. Inspections,as described above,are required at all other times.
When site conditions make the schedule required in this section impractical. the permittee may petition the Division
to grant an alternate inspection schedule.
b) Inspection Requirements
I) Inspection Scope-The construction site perimeter.all disturbed areas,material and/or waste storage areas that
are exposed to precipitation,discharge locations,and locations where vehicles access the site shall be inspected
for evidence off,or the potential for.pollutants leaving the construction site boundaries,entering the stormwatcr
drainage system,or discharging to state waters. MI erosion and sediment control practices identified in the
SWMP shall be evaluated to ensure that they arc maintained and operating correctly.
2) Inspection Report/Records-The pennittce shall keep a record of inspections. Inspection reports must
identify any incidents of non-compliance with the teens and conditions of this permit. Inspection records must
be retained for three years from expiration or inactivation of permit coverage. At a minimum,the inspection
' report must include:
i) The inspection date:
ii) Name(s)and titles)ofpersonnel making the inspection;
iii) Location(s)of discharges ofseediment or other pollutants from the site:
iv) Location(s)of t3MPs that need to be maintained;
v) Location(s)of BMI's that failed to operate as designed or proved inadequate for a particular locution:
vi) Location(s)where additional BMPs are needed that were not in place at the time of inspection;
vii) Deviations from the minimum inspection schedule as provided in Pail l.D.b.a above:
vii) Description of corrective action for items iii,iv,v,and vi,above,dates corrective action(s)taken,and
measures taken io prevent future violations,including requisite changes to the SWMP,as necessary;and
' viii) After adequate corrective actions)has been taken,or where a report does not identify any incidents
requiring corrective action,the report shall contain a signed statement indicating the site is in compliance
with the permit to the best of the signer's knowledge and belief.
c) Required Actions Following Site Inspections Where site inspections note the need for IMP maintenance
activities,BMPs must be maintained in accordance with the SWMP and Part I.D.7 of the permit. Repair,
replacement.or installation of new BMPs determined necessary during site inspections to address ineffective or
inadequate IIMPs must be conducted in accordance with Part t.D.R ot'the permit. SWMP updates required as a
result of deficiencies in the SWMP noted during site inspections shall be made in accordance with Part I.D.S.c of the
permit.
7. BMP Maintenance
All erosion and sediment control practices and other protective measures identified in the SWMP must be maintained in
effective operating condition. Proper selection and installation of l3MPs and implementation of comprehensive Inspection
' and Maintenance procedures,in accordance with the SWMP,should he adequate to meet this condition. IIMPs that are not
adequately maintained in accordance with good engineering,hydrologic and pollution control practices,including removal
of collected sediment outside the acceptable tolerances of the BMPs,are considered to be no longer operating effectively
and must be addressed in accordance with Part I.D.t.below. A specific timeline for implementing maintenance
procedures is not included in this permit because BMP maintenance is expected to be proactive,not responsive.
Observations resulting in BMP maintenance activities can he made during a site inspection.or during general observations
of site conditions.
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PART I
Permit- Page 14
Permit No.COR-030tH){)
D. TERMS AND CONDITIONS (cont.)
' K Replacement and Failed RMPs
Adequate site assessment must be performed as part of comprehensive Inspection and Maintenance procedures,to assess
the adequacy of RMPs at the site,and the necessity of changes to those BMPs to ensure continued effective performance.
Where site assessment results in the determination that new or rtplacemenl.BMPs are necessary,the RMPs must be
installed to ensure on-going implementation of BMPs as per Part 1.1).2.
Where BMPs have failed, resulting in noncompliance with Part 1.112, they must he addressed as soon as possible,
immediately in most cases,to minimize the discharge of pollutants.
When new BMPs are installed or BMPs are replaced. the SWMP must be updated in accordance with Part 1.0.5(e).
i9. Reporting
No scheduled reporting requirements are included in this permit: however,the Division reserves the right to request that a
copy of the inspection reports be submitted.
10. SWMP Availability
A copy of the SWMP shall be provided upon request to the Division, EPA,or any local agency in charge of approving
sediment and erosion plans,grading plans or stormwatcr management plans,and within the time frame specified in the
request. If the SW MP is required to be submitted to any of these entities,it must include a signed certification in
accordance with Part I.F.I of the permit,certifying that the SWMP is complete and meets all permit requirements.
All SWMPs required under this permit are considered reports that shall he available to the public under Section 30S(h)of
' the CWA and Section 61.5(4)of the Colorado Discharge Permit System Regulations. The permittee shall make plans
available to members of the public upon request. However,the pcnnittcc may claim any portion of a SWMP as
confidential in accordance with 40 CFR Part 2.
II. Total Maximum Daily Load(TMDL)
If a TMDL has been approved 11w any waterbody into which the peen»ttee discharges,and stormwatcr discharges
associated with construction activity have been assigned a pollutant-specific Wasteload Allocation(W LA)under the
TMDL,the Division will either:
a) Ensure that the W L.A is being implemented properly through alternative local requirements,such as by a municipal
stormwatcr permit;or
h) Notify the pcnnittcc of the WLA, and amend the permrttee's certification to add specific BMPs and/or other
requirements,as appropriate. The permittce may he required to do the following:
I) Under the perminee's SWMP, implement specific management practices based on requirements of the WLA,
and evaluate whether the requirements arc being met through implementation of existing stormwater HMI's or
if additional BMPs are necessary. Document the calculations or other evidence that show that the requirements
are expected to be met;and
2) If the evaluation shows that additional or modified HMI's arc necessary,describe the type and schedule for the
BMP additions/revisions.
Discharge monitoring may also be required. The permittce may maintain coverage under the general permit provided they
comply with the applicable requirements outlined above. The Division reserves the right to require individual or alternate
general permit coverage.
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PART I
Permit-Page 15
Permit No.(:OR-03(00()
L. ADDITIONAL DEFINITIONS
F'or the purposes of this permit:
1. Best Management Practices(BM Ps); schedules of activities.prohibitions of practices,maintenance procedures,and
' other management practices to prevent or reduce the pollution of waters of the State. BMPs also include treatment
requirements,operating procedures,pollution prevention,and practices to control site runoff.spillage or leaks,waste
disposal,or drainage from material storage.
2. Dedicated asphalt plants and eons rote plants: portable asphalt plants and concrete plants that are located on or adjacent
to a construction site and that provide materials only to that specific construction site.
1
3, Final stabilization: when all ground surface disturbing activities at the site have been completed,and uniform vegetative cover has been established with an individual plant density slat(cast 70 percent of pre-disturbance levels,or equivalent
permanent,physical erosion reduction methods have been employed. For purposes of-this permit,establishment of a
vegetative cover capable of providing erosion control equivalent to pre-existing conditions at the site will be considered
final stabilization.
4. (Municipal separate storm sewer system:a conveyance or system of conveyances(including:roads with drainage
systems,municipal streets,catch basins,curbs.gutters.ditches,man-made channels,or storm drains),owned or operate
by a State.city.town,county,district,or other public body(created by state law),having jurisdiction over disposal of
sewage,industrial waste.stormwatcr,or other wastes:designed or used for collecting or conveying stormwater.
5. Operator: the entity that has day-to-day supervision and control of activities occurring at the construction site. This can
be the owner,the developer,the general contractor or the agent of one of these parties.in some circumstances. It is
anticipated that at different phases of a construction project.different types of parties may satisfy the definition of
'operator'and that the permit may be transferred as the roles change.
6. Outfall: a point source at the point where stonowater leaves the construction site and discharges to a receiving water or a
stornwater collection system.
7. Part of a larger common plan of development or sale:a contiguous area where multiple separate and distinct
construction activities may be taking place at different limes on different schedules.
K. Point source:any discernible.confined and discrete conveyance from which pollutants arc or may he discharged. Point
' source discharges of sto rmwater result from structures which increase the imperviousness of the ground which acts to
collect ninoff.with runoff being conveyed along the resulting drainage or grading pattern.
9. Pollutant:dredged spoil,dirt,slurry,solid waste,incinerator residue.sewage,sewage sludge,garbage.trash,chemical
waste,biological nutrient.biological material,radioactive material,heat,wrecked or discarded equipment,rock,sand,or
any industrial,municipal or agricultural waste.
10. Process water: any water which,during manufacturing or processing,comes into contact with or results from the
production of any raw material.intermediate product,finished product.by product or waste product. This definition
includes mine drainage.
I I. Receiving Water: any classified stream segment(including tributaries)in the State ot'Colorado into which stormwater
related to construction activities discharges. This definition includes all water courses,even if they are usually dry,such as
borrow ditches,arroyos.and other unnamed waterways.
12. Significant Materials include,but arc not limited to:raw materials:fuels;materials such as solvents,detergents,and
plastic pellets;finished materials such as metallic products;raw materials used in trod processing or production;hazardous
substances designated under section 101(14)of CERCLA;any chemical the facility is required to report pursuant to
section 313 of title Ili of SARA;fertilizers:pesticides:and waste products such as ashes,slag and sludge that have the
potential to be released with stormwater discharge.
13. Sturmwater:precipitation-induced surface runoff.
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PART 1
Permit -Page 16
Permit No.COR-030000
F. OF.NERA!. REQUIREMENTS
I. Signatory Requirements
a) All reports required for submittal shall be signed and certified for accuracy by the per-mince in accordance with the
1 following criteria:
1) In the case of corporations,by a principal executive officer ol'at least the level of vice-president or his or her
duly authorized representative,if such representative is responsible for the overall operation of the facility from
' which the discharge described in the form originates;
2) In the case of a partnership.by a general partner;
3) In the case of a sole proprietorship,by the proprietor:
4) In the case of a municipal,state,or other public facility,by either a principal executive officer,ranking elected
official,or other duly authorized employee,if such representative is responsible for the overall operation of the
facility from which the discharge described in the form originates.
b) Changes to authorization. If an authorization under paragraph a)of this section is no longer accurate because a
different individual or position has responsibility for the overall operation of the facility,a new authorization
satisfying the requirements of paragraph a)of this section must be submitted to the Division,prior to or together
with any reports,information,or applications to he signed by an authorized representative.
' c) Certifeation. Any person signing a document under paragraph a)of this section shall make the following
certification:
"I certify under penalty of law that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,or
those persons directly responsible for gathering the information,the information submitted is,to the best my of
knowledge and belief,true,accurate,and complete. I am aware that there are significant penalties for
submitting false information,including the possibility of fine and imprisonment for knowing violations.''
1 2. Retention of Records
a) The permittee shall retain copies of the SWMP and all reports required by this permit and records of all data used to
' complete the application to be covered by this permit,for three years after expiration or inactivation of permit
coverage.
h) The permittee shall retain a copy of the SWMP required by this permit at the construction site from the date of
project initiation to the date of expiration or inactivation of permit coverage,unless another location.specified by
the pennittce,is approved by the Division.
3, Monitoring
1 The Division reserves the right to require sampling and testing,on a case-by-case basis(see Part 1.D.l.c),for example to
implement the provisions of a TMDL(see Part l.D,l l of the permit). Reporting procedures for any monitoring data
collected will be included in the notification by the Division of monitoring requirements.
if monitoring is required,the following definitions apply:
a) The thirty(30)day average shall be determined by the anthmetic mean of all samples collected during a thirty(30)
consecutive-day period.
b) A grab sample,for monitoring requirements, is a single"dip and take"sample.
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1 '
PART II
A, MANAGEMENT REQUIREMENTS
Amendintt a Permit Certification
The permittcc shall inform the Division(Permits Section) in writing of changes to the information provided in the permit
' application. including the legal contact,the project legal description or map originally submitted with the application,or
the planned total disturbed acreage.The permittce shall furnish the Division with any plans and specifications which the
Division deems reasonably necessary to evaluate the effect on the discharge and receiving stream. If applicable, this
' notification may be accomplished through submittal of an application for a CDPS process water permit authorizing the
discharge.The SW MI'shall be updated anti implemented prior to the changes(see Part I.D.5.c).
Any discharge to the waters of the State from a point source other than specifically authorized by this permit or a different
CDPS permit is prohibited.
2. Special Notifications- Definitions
a 1 Spill: An unintentional release ot'solid or liquid material which may cause pollution of state waters.
b) Upset: An exceptional incident in which there is unintentional and temporary noncompliance with permit discharge
1 limitations because of factors beyond the reasonable control of the permittce. An upset does not include
noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate
treatment facilities, lack of preventative maintenance,or careless or improper operation.
3. Noncompliance Notification
a) The pennittee shall report the following instances of noncompliace:
I) Any noncompliance which may endanger health or the environment:
2) Any spill or discharge of hazardous substances or out which may cause pollution of the waters of the state.
3) Any discharge of stormwader which may cause an exceedance of a water quality standard.
h) For all instances of noncompliance based on environmental hazards and chemical spills and releases,all needed
' information must he provided orally to the Colorado Department of Public Health and Environment spill reporting
line(24-hour number for environmental hazards and chemical spills and releases: I-577-5 I S-5608)within 24 hours
front the time the permittcc becomes aware of the circumstances.
' For all other instances of noncompliance as defined in this section.all needed information must he provided orally to
the Water Quality Control Division within 24 hours from the time the perntiace becomes aware of the
circumstances.
For all instances of noncompliance identified here.a written submission shall also be provided within 5 calendar
days of the time the permittcc becomes aware of the circumstances. The written submission shall contain a
description of:
' I) The noncompliance and its cause;
' 2) The period of noncompliance, including exact dates and times,and if the noncompliance has not been
corrected,the anticipated time it is expected to continue,
3) Steps taken or planned to reduce,eliminate.and prevent reoccurrence of the noncompliance.
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' A. MANAGEMENT REQUIREMENTS(corn.)
4. Submission of incorrect qr Incom@Ste Information
Where the permittee failed to submit any relevant facts in a permit application,or submitted incorrect information in a
permit application or report to the Division,or relevant new information becomes available,the permittee shall promptly
submit the relevant application intimation which was not submitted or any additional information needed to correct any
erroneous information previously submitted.
5. Bvnass
' a) A bypass,which causes effluent limitations(i.e.,requirements to implement BMPs in accordance with Parts I.B.3
and I.D.2 of the permit)to be exceeded is prohibited,and the Division may take enforcement action against a
perntittee tar such a bypass.unless:
tI) Bypass was unavoidable to prevent loss of life.personal injury.or severe property damage;
2) There were no feasible alternatives to the bypass,such as the use of auxiliary treatment facilities(e.g.,
' alternative BMPs),retention of untreated wastes,or maintenance during normal periods of equipment
downtime.This condition is not satisfied if the permittee could have installed adequate backup equipment(e.g.,
implemented additional BMPs)to prevent a bypass which occurred during normal periods of equipment
downtime or preventative maintenance;and
' 3) The permiuce submitted notices as required in"Non-Compliance Notification,"Part II.A.3.
6. Upsets
a) Effect of an Upset: An upset constitutes an affirmative defense.to an action brought for noncompliance with permit
limitations and requirements i f the requirements of paragraph b of this section are met. (No determination made
' during administrative review of claims that noncompliance was caused by upset,and before an action for
noncompliance,is final administrative action subject to judicial review.)
h) Conditions Necessary for a Demonstration of Upset: A permittee who wishes to establish the affirmative defense
of upset shall demonstrate through properly signed contemporaneous operating logs,or other relevant evidence that:
I) An upset occurred and that the permittee can identify the specific cause(%)ot'thc upset;
2) The permitted facility was at the time being properly operated;
3) The permittce submitted notice of the upset as required in Part Il.A.3.ot'this permit(24-hour notice);and
4) The permittee complied with any remedial measures required under 40 CFR Section 122.41(d)of the federal
regulations or Section 61.8(.3Xh)of the Colorado Discharge Permit System Regulations.
' c) Burden of Proof In any enforcement proceeding the permittee seeking to establish the occurrence of an upset has
the burden of proof.
' 7. Removed Substances
Solids,sludges,or other pollutants removed in the course of treatment or control of discharges shall be properly disposed
of in a manner such as to prevent any pollutant from such materials from entering waters of the State.
8. Minimization of Adverse Impact
The permittee shall take all reasonable steps to minimize any adverse impact to waters of the State resulting from
' noncompliance with any terns and conditions specified in this permit,including such accelerated or additional monitoring
as necessary to determine the nature and impact of the noncomplying discharge.
A. MANA(;WENT REQUIREMENTS I S(cont.)
9. Reduction,Loss.or Failure of Stormwater Controls
' The permittee has the duty to halt or reduce any activity if necessary to maintain compliance with the permit requirements.
Upon reduction,loss.or failure of any stornwater controls,the permittee shall,to the extent necessary to maintain
compliance with its permit,control production,or remove all pollutant sources from exposure to stormwater,or both,until
the stormwater controls arc restored or an alternative method of treatment/control is provided.
' It shall not be a defense for a permitter in an enforcement action that it would be necessary to halt or reduce the permitted
activity in order to maintain compliance with the conditions of this permit.
' t O. Prover Operation and Maintenance
The pet-mince shall at all times properly operate and maintain all facilities and systems of treatment and control(and
related appurtenances)which are installed or used by the permittee to achieve compliance with the conditions of this
permit. Proper operation and maintenance includes effective perti►rmancc.adequate funding,adequate operator staffing
and training,and adequate laboratory and process controls, including appropriate quality assurance procedures. This
provision requires the operation of back-up or auxiliary facilities or similar systems only when necessary to achieve
compliance with the conditions of the permit.
' B. RESPONSIBILITIES
' 1. inspections and Right to Entry
The permittee shall allow the Director of thc State Water Quality Control Division,the EPA Regional Administrator,
and/or their authorized representative(s),upon the presentation of credentials:
a) To enter upon the permittec's premises where a regulated facility or activity is located or in which any records are
required to be kept under the terms and conditions of this pcnnir
' h) At reasonable times to have access to and copy any records required to he kept under the terms and conditions of
this permit and to inspect any monitoring equipment or monitoring method required in the permit;and
Ic) To enter upon the permiuce's premises to investigate,within reason,any actual.suspected,or potential source of
water pollution,or any violation of the Colorado Water Quality Control Act. The investigation may include,hut is
not limited to.the following: sampling of any discharge andor process waters,the taking of photographs.
interviewing pennittee stall on alleged violations and other matters related to the permit.and access to any and all
' facilities or areas within the permittee's premises that may have any effect on the discharge.permit,or any alleged
violation.
2. Duty to Provide information
The permittee shall furnish to the Division,within the time frame specified by the Division.any information which the
Division may request to determine whether cause exists for modifying,revoking and reissuing.or inactivating coverage
under this permit,or to determine compliance with this permit. The permittee shall also furnish to the Division,upon
request.copies of records required to he kept by this permit.
3. Transfer of Ownership or Control
Certification under this permit may be transferred to a new permittee if:
al The current permittee notifies the Division in writing when the transfer is desired as outlined in Part I.A.7;and
tb) The notice includes a written agreement between the existing and new permittees containing a specific date for
transfer of permit responsibility,coverage and liability between therm;and
' c) The current permittee has met all fee requirements of the Colorado Discharge Permit System Regulations. Section
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B. RESPONSII3ILITIES(cont.)
4. Modification,Suspension,or Revocation of Permit By Division
•
All permit modification.inactivation or revocation and reissuance actions shall he subject to the requirements of the
Colorado Discharge Permit System Regulations, Sections 61.5(2), 61.5(3),61.7 and 61.15,5 C.C.R. 1002-61,except for
minor modifications.
a) This permit,andior certification under this permit.may he modified, suspended,or revoked in whole or in part
during its term for reasons determined by the Division including,but not limited to,the following:
' I) Violation of any terms or conditions of the permit;
2) Obtaining a permit by misrepresentation or failing to disclose any fact which is material to the granting or
' denial of a permit or to the establishment of terms or conditions of the permit;
3) Materially false or inaccurate statements or information in the application for the permit:
4) Promulgation of toxic effluent standards or prohibitions(including any schedule of compliance specified in
such effluent standard or prohibition)which are established under Section 307 of the Clean Water Act,where
such a toxic pollutant is present in the discharge and such standard or prohibition is more stringent than any
limitation for such pollutant in this permit.
' b) This permit.and/or certification under this permit, may be modified in whole or in par due to a change in any
condition that requires either a temporary or permanent reduction or elimination of the permitted discharge,such as:
' 11 Promulgation of Water Quality Standards applicable to waters affected by the permitted discharge; or
2) Effluent limitations or other requirements applicable pursuant to the State Act or federal requirements: or
' 3) Control regulations promulgated;or
4) Other available information indicates a potential for violation of adopted Water Quality Standards or stream
classifications.
c) This permit,or certification under this permit,may be modified in whole or in part to include new effluent
limitations and other appropriate permit conditions where data submitted pursuant to Part I indicate that such
effluent limitations and permit conditions arc necessary to ensure compliance with applicable water quality
standards and protection of classified uses.
d) At the request of the pennittee,the Division may modify or inactivate certification under this permit if the following
conditions are met:
I) In the ease of inactivation,the permitter notifies the Division of its intent to inactivate the certification,and
certifies that the site has been finally stabilized:
2) In the case ol'inactivation,the Nominee has ceased any and all discharges to state waters and demonstrates to
' the Division there is no probability of further uncontrolled discharge(s)which may affect waters of the State.
3) The Division finds that the permttee has shown reasonable grounds consistent with the Federal and State
statutes and regulations tiff such modification,amendment or inactivation;
' 4) Fee requirements of Section 61.15 of the Colorado Discharge Permit System Regulations have been met:and
5) Applicable requirements of public notice have been met.
' For small construction sites covered by a Qualifying Local Program,coverage under this permit is automatically
terminated when a site has been finally stabilized.
I - S. RESPONSIBILITIES(cont.)
5. Permit Violations
' Failure to comply with any terms andior conditions of this permit shall be a violation of this permit.
Dischargers of stormwater associated with industrial activity,as defined in the 1?PA Stonnwater Regulation(40 CFR
' 122.26(b)(14)and Section 61.3(2)of the Colorado Discharge Permit System Regulations,which do not obtain coverage
under this or other Colorado general permits,or under an individual CUPS permit regulating industrial stormwater,will be
in violation of the federal Clean Water Act and the Colorado Water Quality Control Act,25-8-101.as amended. Failure to
comply with CDPS permit requirements will also constitute a violation.
Lezal Responsibilities
The issuance of this permit does not convey any property or water rights in either real or personal property,or stream
' flows,or any exclusive privileges,nor does it authorize any injury to private property or any invasion of personal rights,
nor any infringement of Federal.State or local laws or regulations.
Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittcc from any
responsibilities,liabilities,or penalties established pursuant to any applicahlc State law or regulation under authority
granted by Section 510 of the Clean Water Act.
' 7. Severability
The provisions of this permit are severable. If any provisions of this permit,or the application of any provision of this
permit to any circumstance,are held invalid,the application of such provision to other circumstances and the application of
' the remainder or this permit shall not be affected.
K. Renewal Application
' I f the permittee desires to continue to discharge,a permit renewal application shall be submitted at least ninety(90)days
before this permit expires. If the permitter anticipates that there will he no discharge atter the expiration date of this
permit.the Division should be promptly notified so that it can inactivate the certification in accordance with Part 1113.4.d.
' 9. Confidentiality
Except for data determined to be confidential under Section 308 of the Federal Clean Water Act and Colorado Discharge
' Permit System Regulations,Section 61.5(4),all reports prepared in accordance with the terms of this permit shall be
available for public inspection at the oflices of the Division. The permittee must state what is confidential at the time of
submittal.
' Any information relating to any secret process,method of manufacture or production.or sales or marketing data which has
been declared confidential by the perntitlee,and which may be acquired.ascertained,or discovered,whether in any
sampling investigation.emergency investigation,or otherwise.shall not be publicly disclosed by any member,officer.or
' employee of the Commission or the Division.but shall he kept confidential. Any person seeking to invoke the protection
of this section shall bear the burden of proving its applicability. This section shall never be interpreted as preventing full
disclosure of effluent data.
' In. Fees
The permittce is required to submit payment of an annual lee as set forth in the Water Quality Control Act. Failure to
submit the required fee when due and payable is a violation of the permit and will rt:sult in enforcement action pursuant to
Section 25-8-601 et.seq..C.R.S. 1973 as amended.
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B. RESPONSIBILITIES(cont.)
11. Requiring an Individual CDPS Permit
The Director may require the permittee to apply for and obtain an individual or alternate general CDPS permit if:
a) The discharger is not in compliance with the conditions of this general permit;
' h) Conditions or standards have changed so that the discharge no longer qualities for a general permit;or
c) Data/information become available which indicate water quality standards may be violated.
'the nominee must be notified in writing that an application 11w an individual or alternate general CDPS permit is required.
When an individual or alternate general CDPS permit is issued to an operator otherwise covered tinder this general permit,
the applicability of this general permit to that operator is automatically inactivated upon the effective date of the individual
or alternate general CDPS permit.
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Water Quality Control Division
WQCD-P-B2
4 300 Cherry C'reek Drive South
Denver, Colorado X0246-/530
R,4 TIO.N.4 L E
I570 ill ATLR DISCYl.4RGli.S ASSOCIATE/) It'77//
C'OA'STR(/C77ON IC T1 t/TY
IGENERAL PERMIT IN COLORADO
THIRD RE;VE0'AL
ICOLORADO 1)1SC'Hl RGE!TRAM'NCIAIBER ('OR-030000
C'ON 1 L 1'I S PAGE
I1. hmndurnon 1
11. Change's in this General Permit I
111. Background X
I iP Surrnnrat'r Discharges ,i.ssnciated with
Cuns!ruction Ac nval' y
I'. Coverage Under this Permit 10
I IL Application and Certification 10
I'1/. Qualifying Local Programs 1I
I'/1/. Terms and Conditions if Permit 11
IX. Public Notice 12/22/06 15
A" Public Nonce 3/_'3'07 15
i. INTRODUCTION
IThis permit is for the regulation a/stornnrater runci/f from construction activities. and specific allowable nn-
.stvnntater discharges in accordance with Part I.D.3 o_l7/u'permit. The term "construction activity"includes
I ground sun/u-e disturbing activities. including, but not limited to. clearing.ing. grading, excavation. demolition.
installation of new or improved hind and access mails, staging areas stockpiling of till materials. and borrow
areas. "Stornnvaler"is precipitation-induced sruface runo//. This rationale will explain the background of the
I Slurmwater program, activities which are covered under this permit, hors to apply far cove rage under this permit.
and the re0uirenu'nts of this permit
The forms discussed in the rationale and permit are arailahle on the .Eater Quality Control Division's rrehsite
Iat avw.cdphe.stute.cO.rn'regq'Pes'ism'I iri!
/1. CHANGES IN Ti//S GENERAL PERMIT
ISeveral notable changes from the previous General Permit for Construction Activities hate been ittemparalec/nun
this pernril. Significant change.' are listed below. Numerous other minor changes were nutdeJbr c'/cri/icahun
I /imposes only.
I. Authority to Discharge
I This .section has been restructured to list all meth('types of activities covered ht dos permit. and to he
consistent with the definition of'c'onstruction activity." The definition of construction activity has been
c'cpanded to provide clarification. See Part I.A.1 of the pervnil.
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PART II
' Permit Page 24
Permit No.COR-039000
!l. CHANGES IN THIS GENERAL PERMIT(cunt.)
B. Authority to Dischor, e— Oil and Gas Construction
This section has been added, to take into account a regulatory change. The federal Energy Polity Act of
20(15 exempts nearly all oil and gas construction activities from.federal requirements under the Clean Water
Act's NPDES.stormwate'r discharge permit program. In January 2006, the Colorado Water Quality Control
Commission held a hearing to determine what effects. if any, the change in federal law would have upon
' Colorado's stormwater regulations. The Commission determined that oil and gas construction sites in
Colorado that disturb one or more acres are still required to he covered under Colorado's storm water
permitting regulations (Colorado Discharge Permit,ystern (CDPS)regulations(5CCR 1002-6!)). In
practice, oil and gas construction sites have the same requirements under this permit as du other types al'
' construction. However. this permit contains some references to the federal Clean Water Act;generally these
references are not applicable to oil amigos construction.sites to the extent that the references are limited by
the federal Energy Po/icy Act of 2005. See Part l.A.1(h)of they permit.
' C. Application Requirements
' The permit application requirements have e'hanged slightly, including the addition of an email address, if
available. See Part 1.A.4(h).
The applicant must he either the owner and/or operator 0/'the construction site. An operator at a
' e'onslruction site that is not covered by a certification held by an appropriate entity may he held liable far
operating without the necessary permit coverage.
D. Temporary Coverage
Part I.,4.5(d)of the previous permit(effective July 1, 2002)dealt with temporarily covering a.facility under
the general permit even On individual permit is more appropriate. This permit section essentially
duplicated Me previous section(see Part 1.A._5(c)), and so it has been deleted.
E. Reassignment of Permit Coverage.
Proc.edur s have been added to clarify the requirements far the transfer ofcoverage nf'xpeci is portions oft.
permitted site to a second party.Secs Section VIlI.1.3 of.the rationale and Part l.A.8 of the permit.
F. Individual Permit Criteria
' This section has been modified to include situations involving a Total Maximum Daily Load(TMDL). See
Part LA.1! of the permit.
' G. Stormwater Management Plan (SWMP)
The Stormwater Management Plan section has been divided into two parts:Stormwater Management Platt
(SWMP) -General Requirements, which provides the basic,framework and general requirements for the
' SWMP, and Stormwater Management Plan(SW,4•!P) ._Contents, which specifically identifies each item that
must be addressed in the SWMP. See Parts LB and LC of the.permit.
' H. Stormwater Management Plan (SWMP)- General Requirements
The SWAMP General Requirements section has been modified to require that the SW/u P be updated in
accordance with Parts I.D.5(e)and I.D.5(d)tithe permit(SWMP Review/Changes). This additional
requirement ensures that the SWMP provisions reflect current site conditions, See Part 1.8.2(c)of the
permit.
PART II
I i Permit- Page 25
Permit No.COR-030000
Il. CHANGES NGES IN THIS GENERAL. PERMIT front.)
1. Stornewater Management Plan(SWAP) Contents
I The SWMP Contents section has been modified Some of the changes are limited to organization of
information which dues nut require modification oft'',existing permittee .c current SWMP. Most(#.the
.SWMP changes involve e'ithe'r clarifications, reform sting, or taking r-r'c•ommendotions from the Division's
SWMP guide and making them permit requirements(e.g.. vehicle tacking controls. BMP installation
' specifications). Ilan existing perntittee(i.e..those with permit eorerage before June.30,2007)fi>llowed the
recommendations in the SWMP guide (A ppendi.r A of the permit application). then their SWMP will
presumably meet the new requirements. However.fur any existing permittees who did nut,firllow the
Iapplicable SWMP guide recommendations. their SMWP nuts,be anwndc'd to include the new required items:
-SWMP Administrator
I -Identification o f potential pollutant sources
-Best:Management Practices descriptions and installation specifications, including dedicated concrete or
asphalt hatch plants: vehicle trucking control:and waste management and disposal(including concrete
washout activities).
Fur existing permittees. any SWMP changes bused on the change in permit requirements must he completed
by October 1,2007. The plan is not to be submitted to the Division unless requested, hut must he available
on site as outlined in Part 1.D.5(h)of the permit,
The BMP requirement clarifications included in this renewml permit in no war imply that adequate B,MPs to
' address all pollutant sources at a permitted site were not required in previous permits. The revised
requirements are intended only to better clari/v SWMP content requirements and provide improved direction
to permittees.
IThe SWMP changes are listed below. All new applicants(a/ter June 30, 2007)for permit coverage'erag►e fire their
sites must fully comply with the new SWMP organization,plan requirements,and implementation.
I I. Site Description: The requirement to provide cm estimate of the run-off coefficient has been removed.
The run-off coefficient as currently trtili:t'd in the SWMP may not contribute sufficiently to permit
compliance to.%usli/j'the effort in determining accurate values. See Part I.C.I u/'the permit. Ilowc'v r,
I the Division still encourages use of the c•uelfictent as needed to adequately evaluate site-specific BMP
selection and design criteria(e.g.,pond capacities, BMP location, etc.) See Section C.2 of the SWMP
guidance(Appendix.4 of the permit application).
I2. Site Map: The requirement to ide►nti/i'iunrn(/aric s of the 100-}ear flood plain has been removed, The
boundaries as currently utilized in the SWMP nury not contribute sulfic•ierrtly to permit compliance to
justift•the e//iwt in determining their location. See Part I.C.2 of the permit.
3. Stormwater Management Controls: This section has been modified to require identification of a
SWMP Administrator and all potential pollutants sources in the SWMP. See Part 1.C.3 of the permit.
a) The SWMP Administrator is a specific individual(s).position or title who is responsible far the
process of de veloping, implementing, maintaining, and revising the SWMP. This individual
serves as the comprehenshw point of contact.far all aspects of thefi:eddv:s SWMP. This
Irequirement may necessitate changes to existing permittees'SWhfPs.
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PART II
' Permit-Page 26
Permit No.C'OR-03000()
11. (":ILANGES IN THIS GENERAL PERMIT(cont.)
' b) The requirement to identijf,Potential Pollutant Sources has been expanded to include snore
details for the evaluation al-such sources. This evaluation allows for the appropriate selection
of BMPs far implementation at a facility or site. Additionally, this section was added to he
' consistent with the SWMP guide. This requirement may necessitate changes to existing
permittees'SWMPs.
' c) Best Management Practices(BMPs)for Stormwaler Pollution Prevention: This section was
modified to require the following items to he addressed in the SWMP. These requirements
may necessitate changes to existing permittees'SWMP.c. This section also requires that the
' SWMP provide installation and implementation specifications jar each BMP identified in the
SWMP. Far structural BMPs, in most cases, this must include a technical drawing to provide
adequate installation specifications. See Part I.C.3(c).
Dedicated concrete or asphalt hatch plants. This section requires that the practices used to
reduce the pollulcmts in storm water discharges associated with dedicated concrete or
asphalt hatch plants he identified in the SWMP. (Coverage under the construction site
' SWMP and permit is not required for hatch plants if they have alternate COPS permit
coverage.)
Vehicle tracking control. This section requires that practices he implemented to control
sediment.from vehicle tracking, and that all such practices implemented at the site he
clearly described in the SWMP.
Waste management and divposal. This section requires that the practices implemented at
the site to control stormwcrter pollution front construction site waste, including concrete
washout activities. he clearly described in the SWMP. It also requires that concrete
washout activities be conducted in a manner that clues not contribute pollutants to surface
waters or stormwaler runoff.
' iv) Concrete Washout Water. Part I.1).3(e)of the permit has been revised to conditionally '
authorize discharges to the ground of concrete wash water from washing of tools and
concrete mixer chutes when appropriate BMPs are implemented The permit prohibits the
discharge of concrete washout water to surface waters and to storm.Sewer systems. Part
' LC.3(c)(7)orate permit requires that BMPs he in place to prevent surface discharges 0f
concrete washout water flvnn 11w site.
The use of-unlined pits to contain concrete washout water-is a common practice in
Colorado. The Division has further evaluated the need.*a permit for discharge of
concrete washout water to the i;rounel. The Division has determined that the use of
appropriate BMPs far on-site washing of tools and concrete mixer chutes would prevent
' any significant discharge to groundwater. BMPs to protect groundwater are required by
Part/.C.3(c)(7)(Ohl:permit. Because pH is a pollutant of concern fl.er washout activities.
the soil must have adequate btffiring►capacity to result in protection oldie groundwater
' .standard, or a liner/containment must he used. The following management practices are
recommended to prevent an impact from unlined pits to groundwater:
' (1) the use al the washout site should be temporary(less than I near), and
(2) the washout site should he not be located in cm area where shallow groundwater may
be present, such as near natural drainages, springs, vs wetlands.
1
PART II
1 . Permit- Page 27
Permit No.C{)R-031)X01
11. CHANGES IN THIS GENERAL i'ERMI7'(coat.)
' Where adequate management practices are not Plowed to protect groundwater quality.
the Department inay require discharges to unlined pits to cease. or require the entity to
obtain alternate regulalury approval through notice from either the Water Quality Control
Division or the Hazardous Materials and Waste:Vkrn tgemenl L>i+ision.
In addition, Part 1.l).I(h)u[the permit has been revived to clearly slate that the permit
does rust authorize on-site permanent disposal of concrete washout waste, only tengurra►'t'
' containment of concrete washout water from washing of toots and concrete mixer chutes.
upon termination a►/use nl'the washout site, accumulated solid waste, including concrete
waste and ant'contaminated soils, must he removed from the site to prevent on-site
' disposal of solid waste.
vj Construction Dewatering. Part I.V.3(e!)of the permit has been revised to conditionally
' authorize discharges to the ground v/water from construction dewatering activities when
appropriate RAIN are implemented. The permit does not authorize the discharge of
groundwater%rvm construe•lion dewatering 10 surface waters or Ia storm,sewer systems.
Part 1.C.3(c•)(R)of the permit requires that AMPS be in place to prevent surface discharges.
' The permitter'may apply,f,r coverage under a separate Ci)PS discharge permit, such as
the Construction De watering aler'irrg general permit, if there is a potentiator discharges to
.surface staters.
' The Division has determined that potential pollutant sources introduced into groundwater
.from construction dewatering operations do not have a reasonable potential to result in
' exree dance of'renmdwatc r standards when 11w discharge is to the ground. The primary
pollutant ofcuncern in uncontaminated groundwater is sediment. Although technology-
bused standards far sediment do exist in 5 CCR 1002-41. the discharge of sediment to the
ground us part of'cousmiction dewatering does not have the reasonable potential to result
' in transport of'sediment to the g,•rontdwuter table so us to result in an etceedance ufthose
.standards.
' For a discharge of water co►uaminated with other pollutants that are present in
concentrations that may cause an exceedunce of groundwater standards.separate CDPS
discharge permit coverage is required. Contaminated groundwater may include that
' contaminated with pollutants from a landfill, mining activity. industrial pollutant plume.
underground storage tank, or other source of human-induced groundwater pollution and
exceeding the State ground;a'uterstandards in Regulations 5 CCR 1002-41 and 42.
' J. Terms and Conditions Qeneral Limitations and Design Standards
This section reiterates the requirement hull facilities select, install, implement, and maintain appropriate
BMPs.fr►llowing good engineering. hydrolugic and pollution control practices. In addition. requirements
for protection of water quality standards (see Part ID.I.(a)oldie permit)and requirements to adequately
design IIMPs to prevent polhition or degradation of State waters (.see Part 1.1).2 of the permit)have been
' revised and are Rally discussed in I'etrt lll.A ul'the rationale, below. Additional lcrng;uag►e was also added to
Section MB alike rationale f urlher clarijving the extwetations fi►r compliance with this permit.
1. Munuj!elnenl of.Site Waste
This section has been modified to elan/i'that on-site waste must he properly managed to prevent
potential pollution o/'State waters, and that this permit doe's not authorize our-site ►taste disposal.
Solid waste disposal is regulated by the Hazardous Materials am!Waste Management Division.
i
1
PART li
' Pcnnit-fags 21
Pcrmit No.CC)R-0300U11
Jl. ('1L4NGES iN MIS GENERAL PERMIT wont)
K. Terms and Conditions. SWMP Requirements
1. SWMP Review/Changes: This section now requires that when changes are made to site conditions,
the SWMP must he revised immediately, except.*some RMP description changes which
conditionally may occur within 72 hours. This requirement is included to both ensure that the SWMP
he kept accurate and up-to-date. and to clurif i'that stnrmwater management at a site typically should
' be proactive instead of re p tsie, and he integrated into site management to ensure it is calibrated
with those changes. The section was also clarified to stale that only changes in site conditions that do
not require new or modified BMPs do not need to he addressed in the SWMP. See Part i.D.i(c.)of the
' permit.
2. SWMP Certification: The previous permit was unclear on a requirement that the copy of SWMP that
remains at the facility had to he signed in accordance with permit sig►natory requirements. This
' requirement has been deleted. The signatory requirement of Part IF.I only applies to the SWAP if it
is to he submitted to the Division or to EPA. See Part 1.F.1 of 11w permit.
L. Terms and Conditions, Post-Slone Inspections
The previous permit required post-storm inspections. hut did not.sped/v the timing of inspections. This
section now requires that post-storm event inspections generally he conducted within 24 hours of the event.
An alternative timeline has been allowed, onk for sites where there are no construction activities occurring
for/owing a storm event. For this condition.post-storm event inspections shall instead be conducted prior to
commencing construction activities, but no later than 72 hours following the storm Gwent, and the delay
' noted in the inspection report.
Any exception from the minimum inspection schedule is temporary. and does not eliminate the requirement
' to perform routine maintenance due to the effects of'a storm event including maintaining vehicle tracking
controls and removing sediment from impervious areas. In many cases. maintenance needs will require a
more frequent inspection schedule than the minimum inspections required in the permit, to ensure that BAIN
continue to operate as needed to comply with the permit. See Part I.1).6(a)of the permit.
M. Terms and Conditions. Inspections
i. The Winter Conditions Inspection Esc-becion section has been modified to include documentation
requirements fin-this exclusion. See Part Lb.6(a)of the permit. The Inspection Scope has been
modified to include they requirement to inspect waste storage areas during inspections conducted in
accordance with the permit. See Part 1.D.6(h)of the permit.
2. The requirements for sites to qua/if,,finr reduced inspection frequencies for completed sites hove been
' slightly modified(see Part Lb.6(a)(21 of the permit.). The requirement now is that only construction
activities that disturb the ground surface must he completed. Construction activities that can he
conducted without disturbance oldie ground surface,'fur example. interior building construction, and
some oil well activities. would not prohibit a site from otherwise quali/'ing fir►-the reduced inspection
' frequency. in addition. the requirement fur the site to he prepared for.final,stabilization has been
slightly modified to allow for sites that have not yet been seeded to qualifif,as long as the site has
otherwise been prepared for.lfinal stabilization, including completion o/apprupriate soil preparation,
' amendments and stabilization practice. This will allow for sites with seasonal seeding limitations or
where additional seed application may be needed in*future to still qualili'.
I .
PART II
1 , Permit - I'age 29
Permit No. Ct1R-030000
1i. CHANGES IN THIS GENERAL PERMIT(exact.)
1 3. The inspection Report/Records section(Part 1.0.6(b)(2)) was added to clarify requirement for
inspection reports generated during an inspection conducted in accordance with Part 1.O.6 of the
permit. lnspection reports must he signed by the inspector. or the individual verifying the corrective
' action indicated in the inspection►eport. on behalf of the permittee. Inspection reports are not
typically required to he.submitted to the Division. and therefore. are not required to he signed and
certified for accuracy in accordance with Part 1.1•:1 oldie permit. However, any irtcpection reports
' that are submitted to the Division must firllow the signatory requirements contained in that section.
N. Terms and Conditions. Maintenance, Repair, and Replacement of Control Practices
' These sections have been added to clari fi,requirements for maintaining the BM1's identified in the SWAP
and for•addressing inefieciive or Piled BMPs. UMP mairuenance and site assessment to dclerminc►the
overall adequacy of slarmwater quality mailage'nwiil at the site must occur proactively. in order to ensure
adequate control of pollutant sources at the site. In most cases, if HMI's are already not operating
effectively. or have fiiiled. the issue must be addressed immedicile/y, to prevent discharge o/pollutants. Sec
Parts 1.1).7 and 1.O.8 of the permit.
1 O. Total Maximum Doily goad(T DL)
A section on TMDLc has been added. This section gives a general outline of the additional requirements
' that may be imposed by the Division if the facility discharges to a waterbodytier which a stornnvatc'r-related
TMDL is in place. See Section T71LC'of the rationale and Part 1O.11 c,f the permit.
' P. Additional Definitions
Part I.E, of the permit has been modified to remove the definition of nmoff'coefficient, as it is no longer a
' permit requirement. The dc:finiliun fur state waters has also been deleted. but run be found in Regulation 61.
Q. Changes in Discharge
The section on the types of dischargeorfiacility changes that necessitate Division notification has been
clarified See Part 11.A.I of the permit.
R. Nor Compliance Notification
The section on notification to the Division regarding instances of non-compliance has been amended to
detrifi which types of noncompliance require notification. See Part MA.3 of the permit.
1
S. Short Term Certifications
' The previous permit allowed small short-term construction activities to he authorized far a predetermined
period from 3 to 12 months, and then automatically expire(an inactivation request did not need to be
submitted). The issuance o/these eertificcrliuns has led to significant eonficsion and incidents of
' noncompliance resulting front permit/Yes unintentionally Jelling their certifications expire prior to final
stuhilizatian.as well as issues regarding billing. There,fore, the provisions for short-term certifications have
been deleted.
B pass
The Division has revised the Bypass conditions in fart 11.4.5 u/'the permit to he consistent with the
requirements of Regulation 61.8(3)(i). The revised language addresses under what rare occurrences BMP.c
may ht'bypassed at a site.
I
PART ll
Permit-Page 30
Permit No. C OR-030000
111. BACKGROUND
.4s required under the Clean Water Act amendments of 1987, the Environmental Protection Agency(EPA)has
established a.framework jOr regulating municipal and industrial storm water discharges, This framework is under
the National Pollutant Discharge Elimination System(NPDES)program (Note: The Colorado program is
r%rred to as the Colorado Discharge Permit System. or CUPS, instead o/NPDES.) The Water Quality Consul
Division("the Division")has stnrmwater regulations(SCCR 1002-tit)in place. These regulations require specific
types of industrial facilities that discharge.stormwater associated with industrial activity(industrial stor-mwoter),
' to obtain a COPS permit fin'such discharge. The regulations specifically include construction activities that
disturb one acre of land or more as industrialliteilitics. Construction activities that are part of a larger common
plan of development which disturb one acre or mart'over a period of time are also included.
A. General Permits
The Division has determined that the use of general permits is the appropriate procedure for handling most
of the thousands of industrial.stormwater applications within the State.
B. Permit Requirements
' This permit does not impose nu►nerie effluent limits or require submission of elnuent monitoring data in the
permit application or in the permit itself The permit instead imposes practice-based effluent limitations jar
.ctorvnwater discharges through the requirement to develop and implement a Stormwater Management Plan
' (SWMP). The narrative permit requirements include prohibitions against discharges of nun-stormwater
(e.g..process water). See Part I.D..3 u/'the permit.
' The permit conditions for the SWMP include the requirement jar dischargers to select. implement and
maintain Best Management Practices(BAMP.$)at a permitted construction site that adequately minimize
pollutants in the discharges to assure compliance with the terms and conditions of the permit. Part 1.0.2 of
' the permit includes basic design standards far BMPs implemented at the site. Facilities must select, install,
implement, and maintain appropriate BMP.s.following good engineering. hydrologic and pollution control
practices. BMPs implemented at the.site must be adequately designed to control all potential pollutant
sources associated with construction activity to prevent pollution or degradation oJ'State waters. Pollution
is defined in COPS regulations(5CCR /002-h1)as man-made or man-induced, or natural alteration(idle
physical, chemical, biological. and radiological integrity atwitter. Utilizing industry-accepted standards fin.
BMP selection that are appropriate for the conditions and pollutant.you ces present will twically be
adequate to meet these criteria, since construction BAlPs are intended to prevent the discharge of all hut
minimal amounts of.sediment or other pollutants that would not result in actual pollution of State waters, us
defined above. However,site-.specific design, including ongoing assessment ol'BMPs and pollutant sources,
is necessary to ensure that BMPs operate as intended
The permit,further requires that.v'torrnwater discharges from construction activities shall not cause, have the
reasonable potential to ccnase, or measurably contribute to an excursion above any water quality standard.
1 including narrative standards for water quality. This condition is the basis for erll COPS Discharge permits,
and addresses the need to ensure that waters of the Slate maintain adequate water quality, in accordance
with water quality standards, to continue to meet their designated uses. It is believed that, in most cases.
B%fPs can he adequate to meet applicable water quality standards. If water qualitti,impacts are noted, or
the Division otherwise determines that additional permit requirements are necessary, they are typically
imposed as follows: I) at the renewal of this general permit or through a general permit specific to an
industrial sector(i/'the issue i.s sector-based): 2)through direction from the Division hayed on the
' implementation of a TMDL(if the issue is watershed hosed):or 3) it the issue is.cite-specific, through a
revision to the certification from the Division based cm an inspection or SWMP review, or through an
individual permit.
PART II
Permit-Page 31
Permit No.t'OR-030000
111. BACKGROUND front.)
Some construction sites nru'be required to comply with a Qualifying /.oral Program in place of'meellni,•
several oldie specific requirements in this permit. Sites covered by u QuclfVing Local Program may not he
required to submit an application_for coverage or a notice of inactivation and may not he required to prig the
Division's ro m al.fee. See Section VII of the rationale.
C Violations/Penalties
' Dischargers of stormwuter associated with industrial activity. as defined in the CDPS regulations(5CCR
1002-611, that do not obtain coverage tinder this or other Colorado general permits.or under an individual
CUPS permit reg►ulating industrial stot'mt+'uler, will be in violation of the Federal Clean Water Act and the
Colorado Wirier Quality Control Act. ?5-M-101. For,facilities covered under a CDPS permit..fiiilw-e to
comply with any CDPS permit requirement constitutes ci violation. As of the time of permit issuance, civil
penalties/or violations of the Act or CUPS permit requirements may be up to$10,(100 per day, and criminal
pollution of state stealers is punishable bylines o/up to$25.000 per day.
IV STORMWATER DiSC:HARGESASSOC'1.4TED W1T11 CONSTRUCTION ACTIVITY
' The.stormwater regulations(CDPS regulations (SCCR 100?-6/i), require that stormwaler discharges associated
with certain industrial activities bc'covered tinder the permit program. Construction activity that disturbs one
acre or more during the life u/the project is specifically included in the listed industrial activities. This permit is
' intended to roger most slormwater discharges.from construction facilities required by State regulation to obtain cr
permit.
' A. C.onsu'uctiun Activity
Constriiction activity includes ground surface disturbing activities including. but not limited to, clearing,
grading, excavation, demolition. installation rrfnets.or improved haul and access mutt staging areas,
stockpiling affil/materials, and dedicated borrow//ill areas. Construction dues not include routine
maintenance to maintain original line and grade. hydraulic capacity. or original purpose r f the.facility. (The
maintenance exclusion i.s intended/or prrjecI.s stub as road resurfacing, and where there will he less than
' one acre of additional ground disturbed. hnproverne►rls or upgrades to existing facilities or roads. c+'iune ut
least one acre is disturbed, would not yucr/iit'as "routine maintenance. ")
' Definitions a/'additional terms can he/ound in Part LE ol'the permit.
Siormw'ater discharges from all construction uctirilr require permit coverage. except fin-operutio►rs that
' result in the disturbance a/'less than one acre of total land area and which are not part o f a larger common
plan of development or sale. .4 "larger common plcur of development or sale"is a contiguous area where
multiple separate and distinct construction activities ties may he taking place at different limes on different
schedules.
B. Types of Discharees/Activities C'ove'red
Stormwater; This permit is intended to cover most new or existing discharges composed entirely of
storm water,from construction activities that are required by State regulation to obtain a permit. This
includes slormwater discharges usscu'icrted with ewers that are dedicated to pr oduc'lug earthen
materials.such as soils, sand, and word,fin-use at a single construction site. These areas mar be
located at the construction site or at some other location. This permit does not authorize the
discharge of mine water or process wute r.from borrow areas. This permit may also corer stormwcrter
discharges.associated with dedicated asphalt plants and concrete plants located at a specific
construction site.
1
PART II
Permit-Page 32
Permit No.COR-030000
IV. STORMi'ATER DISCHARGESASSOCL47ED WITH CONSTRUCTION ACTIVITY(cunt.)
' 2. Process water: Under certain restrictions, discharges to the ground from construction dewatering,
and from concrete washout activities, are also covered(see Parts LC.3(c)(7). LC.31c)(t), 1.D.3(e)and
I.D.3(d)of'the permit).
C. Types of Activities NOT Covered
i. Stormwater: Aside from the sources listed in subparagraph B.1. above. this permit does not cover
' stormwater discharged from construction sites that is mixed with stormwaterfrom other types u/'
industrial activities, or process water ofanv kind. Other types of industrial activities that require
.stormwater discharge permits pursuant to different sections oldie regulations(Regulation 5 CCR
1002-6I, Section 61.2(e)(iii)(A-l. K)J, are not covered by this permit.
2. Process water: This permit also does not cover any discharge of process water to surface waters. If
the contraction activity encounters groundwater: in order to discharge this groundwater to surface
' waters, a Construction Dewatering Discharge Permit(permit number COG-070000)must also he
obtained. ,4n application for this permit can he obtained from the Division at the address listed in
Part LA.4(a)o/'the permit,oral the website in Section 1 of the rationale.
' V. COVERAGE ERAGE UNDER MS'GENERAL PERMIT
' Under this general permit, owners or operators of stormwater discharges associated urith construction acriyity
may he granted authorization to discharge.stortnwater into waters oldie. Stale of This inclucles
stormwatcr discharges associated with industrial activity from areas that are dedicated to producing earthen
materials, such as soils, sand and gravel.fin-use at a single construction site, and dedicated asphalt plants and
' dedicated concrete plants.
This permit does not pre-empt or supersede the authority of other local, state or federal agencies to prohibit,
restrict or control discharges o/stormwaler to storm drain x_vstc'nts or other water courses within their
.jrtrisdiction.
Authorization to discharge under the permit requires submittal of a completed application farm and a certification
that the SWMP is complete, unless the site is covered by cr Qua!iftiring Local Program. Upon receipt of cell
required information. the Division may allow or disallow coverage under the general permit.
' VI. APPLICATION A ND CERTIFICATION
' At least ten days prior to the commencement of construction activities, the owner or operator of the construction
site shall submit an original completed application which includes the signed certification that the SWMP is
complete. Original signatures are required.for the application to he considered complete. For small construction
sites only, lithe site is covered Iii a Qucrli/i'ing Local Program(see below), submittal of an application is not
required.
For the ptttposes o/'this permit, the "operator"rator"is the person who has dery-to-dale control over the project. This
can be the owner, the developer, the general contractor or the agent of one of these parties, in some
circumstances. At different times during a construction project, different types of parties may satisfj'the definition
of"operator"and the certification may be treats/erred as roles charge.
(Note- Under the Federal regulations, this application process is referred to as a Notice of Intent, or NO!. For
internal consistency with its current program, the Division will continue to use the term "application."),4
summary of the permit application r c quirenrents is,found in the permit at Part 1..4.4(b).
If coverage under this general permit is appropriate, then a certification will he developed and the applicant will
he certified under this general permit.
i
.
PART[1
Permit-Page 33
Pennit No.COR-030000
VII. QUALIFYING LOCAL. PROGRAMS
' For stormwaler discharges associated with smu11 construction activity(i.e., one(alive acre disturbed in'a sites).
the permit includes conditions that incorporate approved quali/i'ing local erosion and sediment control program
(Qualifj'ing Local Program)requirements by reference. A Qualifying Local Program is a municipal storm water
program far stormwuler discharges associated with small construction activity that has been formally approved
by the Division. The requirements for Qualifying Local Programs are outlined in Part 6/.X(12)Odle Colorado
Discharger Permit System Regulations (also see the Division's -Qualifying Local Programs for Small
C.'onstruc•tion Sites-Application Guidance-1.). Such programs must impose requirements to protect water quality
that are at least cis.stringent as those required in this permit.
' A. Approval Termination I
A Quali/ring Local Program mar be terminated by either the Division or the municipality. Upon termination
ol'Division approval q/a Qualifying Local Program, ant'small construction activity required to obtain
permit coverage under Section 6/.3(2)(6)of the COPS regulations(sCCR 11X12-61).shall submit ail
application/iu'm as provided by the Division. with a certification that the Siormwaler Management Plan
(.SWAMP)is complete us required by Part LA._3 of the permit. within 30 days of Division notification.
iB. Approval&rpir'crtion
' Division approval of a Qualmring Local Program will expire with rids general permit on June 30, 2012. Any
municipality desiring to continue Division approved of their program merest reapply by March 31, 21112. The
Division will determine if.the program may continue us a approved Qualifying Local Program.
VIII. TERMS AND CONDITIONS OF PERMIT
A. Coverage under a Qualih•ine Local Pr oeram For Small Construction Sites Only
For small construction sites(disturbing less than 5 acres)covered under a Qualifying Local Program(see
Section VII, alxn'e), only certain permit requirements apply. as outlined he/ow. The local program must
!Cave.'been for•muly designated by the Division to quali/v. Most municipalities have.some type of local
' program and may require permits and lees. Hrntw►•er, simply haying a program in place does not
necessarily mean that it is a quali f ring program and that a State permit is not required. The local
municipality ix responsible fur not!/ring operators andk►r uw'ners that they are covered br a Quctlifi'ing
' Local Program. As of Mar 31, 2007, the only approved Qualifying Local Programs within the.state are,for
(;olden, Durango and Lakewood. .4n',rehired list of nrunieipulities with Qucrlifi'ing Local I'rogrcuns,
including contact information. is available on the Division's website at:
' /nip, cap/re'.sJarc'1'11,11• 1', :'r►1,1,•l-rut. �lnrlur',1ie'l.e nl!�n'Ur /lull.illllrl.
The Division reserves the right to require ant'vomit-Whin owner or operator within the jurisdiction of a
Qualif ring Local Program covered under this permit to apply fin-and obtain coverage under the,full
requirements of this permit.
I. Permit Coverage: if a construction site is within the jurisdiction oft,Qualifying Local Program, the
owner or operator of the construction activity is authorized to discharge.stormw'crter ascot iated with
small construction activity under this general permit without the submitted oleo application to the
Division. The permittee also is not required to submit an inactivation notice or payment of annual
fee to the Division.
1
PART !I
Permit - Page '4
Permit Nu COR-030000
VIII. TERMS AND CONDITIONS OF PERMIT(cont.)
2. Permit Terms and Conditions: The permittc c covered by a Quuli/ring Local Program must camp(v
with the requirements of that Qmtlifi7ing Local Program. In addition, the f rllowing permit sections are
applicable:
' a) Parts LA. 1.4.2, and I.:1. 3: .Authorization to discharge and discussion of coyer(, e under the
permit.
h) Part La!: General limitations that must be met in addition to local requirements.
' c) Parts I.D.2, 1.113, L D.4: BMP implementation,prohibition of non-storm water discharges
unless addressed in a separate CDPS permit. and requirements related to releases of reportable
quantities.
d) Part I.1),I 1: Potential coverage under a Total Maximum Daily Loud(TMDL).
c:) Part 1.l;: Additional definitions.
.1) Part II (except Jar Parts ILA.I, 11.8..;, 118.8, and Ii.B.10): Spec•ificully includes, but is nat
limited to,provisions applicable in the case of noncompliance with permit requirements, and
' requirements to provide it formation and access.
B. Stormwater Management Plans(SWUPs)
' Prior to commencement u/'construc•tion,a stormwaler management plan(SWMP)shall he developed and
implemented for each facility covered 1w this permit. .4 certification that the SWMP is complete must he
submitted with the permit application. The SWMP shall identifi'potential sources of pollution(including
' sediment) which may reasonably he expected to affect the quality c fstormwater discharges associated with
construction activity from they fuc.•ility. In addition, the plan shall describe the Best Management Practices
(13MP.$) which will be used to,- duce the pollutants in stormKater discharges from the construction site.
(Note that permanent stormwater controls, such us ponds, that are used as temporary construe Lion BMP.s
must he adequately covered in tlw SWMP.) Facilities must implement the provisions of their SWMP as a
condition uf'this permit. The SWMP shall include the following items:
Site Description
2. Site Map
3. Stormwater Management Controls
4. Long-term Stormwuter Management
5. Inspection and Maintenance
' (See Parts 1.8. and LC oldie permit far a more detailed description of SWMP requirements.) The Division
has a guidance document available on preparing a SWMP. The document is included as Appendix A of the
permit application,and is available on the Division's website al www.d/,/tc.„suue.,e,.t,s'ka Permits'fun.
' Some changes have been made to the SWMP requirements. See Section 11.1 of the rationale for a discussion
on permittce responsibilities regarding those changes.
I .
!'ART II
' . Permit-Page 35
Permit No.CUR-030000
VIII. TERMS AND CONDITIONS OF PERMIT(cont.)
Master SWMP
Often, u large construction project will invoke multiple smeller construction sites that are within a common
plum of development, or multiple w e/I pads under construction within an oil and gas well field Pollutant
sources and the apes of BAMPs used can be relatively consistent in.such cases. A pe runiltee could
' significantly streamline the SWMP development process through the use a/'c:muster SWMP. SWAMP
infOrmution must he developed and maintained jiff all construction activities shut exceed one acre(or are
part o f a common plan of development exceeding ding►one acre)conducted►i'ithin the permitted area. By
' developing a single master plan, the permittc•e can eliminate the need to c/eve!up repetitive information in
.separate plans. Such u plan could include two sectio►ss, one cantaininL►a reference section with information
applicable to all sites(e.g., installation details and maintenance requirements for many standard BMPs,
' such as silt fence and erosion bhurkets), and the second containing all of the infi►rmalion specific to each site
(e.g.„site BMP map. drainage plans. details jirr BMPs requiring site specific design,such as retention
ponds).
' As new activities begin, in/irrnrntian required in the SWMP is added to the plan. and as areas become,/inul/t'
.stabilized, the related infer►'mtrtion is removed Records of inliirmation related to areas that have been,/?no/ly
stabilized that are removed from the active plan must be maintained firr a period of:at least three_years from
' the date that the associated site isfinally stabilized.
C. Total Maximum Daily Load(TMDL)
' lithe designated use of a.stream or tuner body has been impaired by the presence of a pollutant(s),
development cif a Total Maximum Daily Laud(TMDL)may he required. A TA1I)L is an estimate of
allowable loading in the wale►'body fw'the pollutant in question. 'types v/'dischaag=es that are or have the
' potential to he a significant source of the pollutant are also identified If a TM!)!.has been approved/i►r any
waterhodv into which the permittee discharges, and.clormwater discharges associated with constrrtctian
activity have been assigned a pollutant-specific Wasteloud Allocation(WLA) under the TMDL, the Division
' will either:
1. Notifb the pc rrnittee of the TM!)!., and amend the perntillee'.s certification to add specific.BMPs
and/or other requirements, as appropriate:or
1 2. Ensure that the TM!)!.k being implemented properly through alternative local requirements,such as
by a municipal starmwater permit. (The only current example()Phis is the Cherry Creek Reservoir
Control Regulation(72.O), which mandates that municipalities within the basin require specific BMPs
' for►r construction sites.)
See Part l.D.11 of the permit Ibr further information.
' D. Monitor ne
Sampling and testing cif slarm►rater fi►r.specific parameters is not required on a routine basis under this
1 permit. However, the Division reserves the right to require sampling and testing on a case-by-case basis, in
the event that there is reason to suspect that compliance with the SWMP is a problem, or to measure the
effectiveness of the BMPs in removing pollraants in the effluent. See Part 1.D.1(e)of the permit.
' E. Futility Inspections
Construction sites typically must inspect their slarmwatcr numagernent controls a!least even}} 14 days and
' within 24 hours after the end of any precipitation or.cno►timcil event that causes surface erosion. ,1t.sites or
portions of sites whe►'e ground-disturbing construction ha.s been completed but a vegetative cover has cwt
been established, these inspections must occur at least once per month. (At sites where persistent snow
cover conditions exist. inspections are not required during the period that melting conditions do not exist.
These
1
PART II
Permit Page 3G
Permit No.CUR-030000
VIII. TERMS AND CONDITIONS OF PERMIT(runt.)
conditions are only expected to occur at high elevations within the Colorado mountains.) For all of these
inspections, records must he kept on/ile. Exceptions to the inspection requirements are detailed in Part
ID.h of-the permit.
F: SWMP Revisions
' The permittee shall amend the SWMP whenever there is a change in design, construction, operation, or
maintenance o/'the site, which would require the implementation of new or revised BMPs. The SWMP.shall
also he amended if it proves to he ineljrctive in achieving the general objectives ofcontrolling pollutants in
stormwaler discharges associated with construction activity. The timing jiff completion of SWMP changes is
detailed in Paris I.D.5(c)and L D.5(d)of the permit.
SWMP revisions shall be made prior to change in the field. or in accordance with Part 11).5(d)of the
' permit.
G. Reporting
The inspection record shall he made available to the Division upon request. Regular submittal of un annual
report is not required in this permit. See Part I.D.9 of the permit.
1 /1. Annual Fee
The permittee is required to submit payment of an annual*as set firth in the Water Quality Control Act.
' Perntitte'es will be billed fur the initial permit fee within a fine►weeks of permit issuance and then annually.
based on a July 1 through June 30 billing cycle.
1 L Responsibility for Permit
The permit certification,for a site may be inactivated, once coverage is no longer needed. The certification
may he trans/erred. if another party is assuming responsibility fur the entire area covered by the
' certification. In addition,permit responsibility f►r part of the area covered by the certification may he
reassigned to another party. These actions are sumnutrized below. The Stormwater Program construction
flirt sheet explains these actions in further detail under they.section on Multiple Owner/Developer Sites, and
' is available on the Division ►tehsite u1
f:rut ,n,riu}t_upy.ai?VW l•trcfVit!rl.1'!�l•:. Section F:
' 1. Inactivation Notice: When a site has beenffrtally stabilized in accordance with the SWMP, the
permittee shall submit an inactivation Notice that is signed in accordance with Part 1.F.1 oldie
permit.A summary oldie Inactivation Notice content is described in Part i.A.6 of the permit. A copy
of the Inactivation Notice form will he mailed to 11w permittee along with the permit certification.
i Additional copies are available from the Division.
For sites where all areas have been removed from permit coverage, the permittee may submit an
' inactivation notice and terminate permit coverage. In such cases the permittee would no longer have
any land covered under their permit certification, and therefore there would he no areas remaining to
finally stabilize. Areas may he removed from permit coverage hy:
' -reassignment of permit coverage(Part 1.11,11 oldie permit);
-sale to homeowner(.) (Print 1..4.9 of the permit):or
-amendment by the permittee, in accordance with Division guidance for areas where permit coverage
has been obtained by a new operator or returned to agricultural use.
1
I .
PART II
' Permit- Page 37
Permit No.('OR-0300W)
VIII. TERMS:1 Ni)CONDITIONS OF PERMIT(cant.)
Transfer of Permit When responsibility,fir'stormwater discharges far an entire construction site
Changes.from one individual to another, the permit shall be transferred in accordance with Part l.A.7
o/'the permit. The permittee shall submit cr completed Notice of Transfer form. which is available
' from this Division, and crl lnt trI 4h. .\kr+,'.ru.trt is r/.p'e'rmit J :yiu. lithe new reslx,nsibh•party will
not complete the tranc'ferlarm, the permit nitro'be inactivated if the permittee has no legal
responsibility, through ownership or contract,fur the construction activities at the site. in this case,
' the new owner or operator would he required to obtain permit coverage separately.
3. Reassignment of Permit: When a perminee no longer has control of a specific portion of a permitted
site, and wishes to transfer coverage of that portion of the site to a second party, the permittee sha11
' submit a completed.Notice of Reassignment of Permit Coverage form, which is available/rum the
Division, and al tt'1t°u'.e,/phe.nine',co.o..'ti q l'4 poit,cl:eltt. Thc'jitrm requires that both the twisting
Itermi lee and new permittee complete their respective sections. See Part 1.4.8 of the permit.
' J. Duration of Permit
' The general permit will expire on June 30. 2012. The permittees authority to discharge under this permit is
approved until the expiration elate of the general permit. Any permittee desiring continued coverage tinder
the general permit prat the expiration date'must apply,/hr recertification under the general permit at least 40
duns prior to its expiration date.
' Kathleen Rosow
December 18. 2006
IX. PUBLIC NOTICE-- 12/22/06
' The permit was sent to public notice on December 22, 2006. A public meeting was requested, and was held im
February 2, 2007. Numerous comments were received on the droll permit. Responses to those comments, and a
suntmena'of changes made to tlw diet%[permit, are in a separate document entitled "Division Response To Public
Comments. " The permit will he sent to a second public,ratio on March 23. 2007. Any changes resulting from the
second public notice will he.summarized in the rationale.
Kathleen Rexow
' March 22, 2007
X. PUBLIC NOTICE-3/23/07
' The permit was sent to public notice./inn a second lime on March 23. 2007. Numerous comments were received on
the second draft permit. Responses to those comments. and cr minimal y,o f the additional changes made to the drat
permit. are contained in a separate document entitled "Division Response la Public Continents Part//". This
I tbeti ne nt is part of the rationale.Ant'changes based on the Division response are incorporated into the rationale
and permit. The response document is available cmline at
buy: tt'tl w.r'tl rite.state_c'ca.io Clio l!ernut.fjoit voiyinliat,Y'.c'c ! olio oon.lirini. or by entailing
(l01;e.wfp.v„cairn%oue,i•r,rts, or by calling the T)ivisiani at 303-642-3517.
I Kathleen Rosow
May 31, 2!107
I
I
Final Drainage
Report contains
oversized maps and
drawings
Please see originals
in File
Christie Peters
From: Kim Ogle
Sent: Wednesday, June 08, 2011 11:51 AM
To: Trevor Jiricek
Cc: Donald Carroll; David Bauer; Clayton D. Kimmi; Heidi Hansen; Frank Piacentino; Jonathan
Gesick; Lauren Light; Mary Evett; Lin Dodge; Pam Kamada; Billie Moore; Esther Gesick;
Christie Peters
Subject: FW: HIGH SIERRA WATER SERVICES ACQUIRES ASSETS OF MARCUM MIDSTREAM
FYI
■ Planners have hard copy in their mailboxes.
Kim
Kim Ogle
Planner III
Department of Planning
1555 North 17th Avenue
Greeley, Colorado 80631
Direct: 970.353.6100 x 3549
Office: 970.353.6100 x 3540
Facsimile:970.304.6498
1841 Jo, ,
W -COU N 1 Y
u
Confidentiality Notice:This electronic transmission and any attached documents or other writings are intended only for
the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise
protected from disclosure. If you have received this communication in error, please immediately notify sender by return
e-mail and destroy the communication. Any disclosure, copying, distribution or the taking of any action concerning the
contents of this communication or any attachments by anyone other than the named recipient is strictly prohibited.
From: Doug White [mailto:dwhite@highsierraenergy.com]
Sent: Wednesday, June 08, 2011 11:44 AM
To: eemckay@comerica.com; erikbauss@hotmail.com; mheitmann@garney.com; jmorgan@bfsales.com; bob@awws.org;
markgunter@shaw.ca; amazing100@aol.com; olivierjmarie@denergy.us; gasjris@gmail.com;
stan.golemon@crosstexenergy.com; baccaray@msn.com; gpecharsky@newalta.com; bfollowill@uscallc.com;
bryan@mmconsultllc.com; outsidefarmboy@hotmail.com; tcommodity@hotmail.com; ian.mclean@ntlworld.com;
suzanne@troutmobile.com; rcochran4@cox.net; Kim Ogle; Michelle@conquestcompanies.com;
colorado6065@yahoo.com; firer8r@hotmail.com; djgage@comcast.net
Subject: HIGH SIERRA WATER SERVICES ACQUIRES ASSETS OF MARCUM MIDSTREAM(dateate n62
,2/27107/ . 24# 73
o� of/ - of
1
lilt, II \I I RRA. C \ L RU1 I P
3773 Cherry Creek North Drive,Suite 1000
Denver,CO 80209
FOR IMMEDIATE RELEASE
HIGH SIERRA WATER SERVICES ACQUIRES ASSETS OF MARCUM MIDSTREAM
Acquisition Advances Firm's Strategic Focus on Oilfield Water Treatment and Recycling Services
DENVER—June 6, 2011—High Sierra Water Services, LLC, a wholly-owned subsidiary of High Sierra Energy, LP, announced
today that it has acquired the assets of Marcum Midstream 1995-2 Business Trust and Marcum Midstream 1995-EC
Holdings, LLC (collectively"Marcum"). Marcum has most recently operated as Conquest Water Services, LLC
("Conquest"). Founded in 1993,Conquest is the largest oil and gas water disposal company in Colorado, operating
exclusively within the prolific Denver-Julesberg Basin in northeast Colorado.
With drilling permits on the rise in the Basin and an increasing number of oil and gas rigs drilling for oil in the Niobrara
Shale, water disposal demands are escalating in Weld County,Conquest's primary operating area. High Sierra expects to
complement Conquest's existing operations and grow the business to serve the needs of its existing and prospective
producer customers.
"High Sierra Water Services partners with leading oil and gas exploration and production companies to provide effective
treatment and recycling of flow-back and produced water obtained in the drilling and production process," said James
Burke, High Sierra Energy Chief Executive Officer. "Our acquisition of Conquest will enable us to serve the growing
number of producers in the Niobrara Shale play as well as the entire region, and provide a reliable source of treated,
recycled water for customers through our innovative, proprietary water treatment technology."
With a focus on long-term, sustainable resource protection, High Sierra Water Services' state-of-the-art water treatment
technology recycles oilfield water to surpass regulatory standards and, in some instances,discharges treated water back
into local water supplies.With four patents issued and three patents-pending,the purification technology engineered by
High Sierra Water Services has revolutionized water treatment in the oil industry.
Terms of the acquisition were not disclosed.
About High Sierra Water Services With a focus on providing long-term, sustainable options, High Sierra Water Services
offers water treatment solutions specifically designed to meet the needs of energy industry oil and gas producers
through state-of-the-art water treatment technology. High Sierra currently operates in the Pinedale Anticline region of
Wyoming, northeastern Colorado, and in parts of Oklahoma and Kansas,with future expansion plans throughout the
United States and Canada. For more information on High Sierra Water Services, please visit www.highsierrawater.com
2
About High Sierra Energy,LP
Based in Denver, High Sierra Energy, L.P., is a privately-owned, rapidly growing midstream energy company engaged in
the marketing and logistics of oil and natural gas liquids and oilfield field water services. For more information on High
Sierra Energy, please visit www.highsierraenergy.com.
###
Contacts:
Nicholas Aretakis Mark Freed
Senior Vice President, Chief Financial Officer Senior Vice President, Business Development
303-815-1010, x176 303-815-1010,x118
naretakis@highsierraenergv.com mfreed@highsierraenergv.com
Doug White
Manager, Produced Water Services
High Sierra Energy L.P./High Sierra Water Services, LLC
3773 Cherry Creek N. Dr., Suite 1000 Denver, CO 80209
dwhite@highsierraenergv.com I Office: 303-815-1010 ext 124 I Mobile: 303-809-3326
3
DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
1 86 I - 20 I I 1555 N. 17`hAvenue
Greeley, CO 80631
Public Health
Web:http://www.co.weld.co.us(departments/healthenvirOnmenl/
twin Adminletntlon Public Health&Clinical Environmental Health Communication. Emergency Preparedness
W E L �y.l 0 N T Y Vital Records Services Services Education&Planning &Response
Tele 970304.6410 Tele 970 304.6420 Tele'970.304 6415 tells 970 304 6470 1 eie 970 304 6420
Lmmomi Fax. 970.304.6412 Fax 970.304.6416 Fax: 970 304 6411 Fax 970 304 6452 Far 970.104.6469
Our vision:Together wish the common/hes we serve.we are working to malre Weld County the nealth,osi hatce to rrve.veto,.woo,aro aav
November 8. 2011
High Sierra Water Services.LLC-
Conquest Water Services
Attn: Jim Goddard
8207 W.2011h Street. Suite B
Greeley.Colorado 80634
Subject: High Sierra Water Services C7(SWD C7A), 2ha1 Semi-annual Inspection 2011
Dear Mr.Goddard:
On October 13. 201 I.the Weld County Dept.of Public Health and Environment conducted a routine inspection of the C7 Class
II Injection Well and Recycling Facility. located at 35859 County Road 74.Weld County.Colorado. The purpose of the
inspection was to assess the facility's compliance with the approved Use by Special Review Permit Number 1747(IISR-17474
and applicable Weld County Code. Based on the inspection the following needs to be addressed by High Sierra:
Report estimated emissions of Volatile Organic Compounds and I1atardous Air Pollutants. Development Standards I I & 20 or
USR-1747 and Section 23-2-250 of the Weld County Code requires the operation of this use to comply with the air quality
regulations promulgated by the Air Quality Control Commission. An Air Pollutant Emission Notice tAPFN)and Construction
Permit Application must be tiled with the Colorado Dept.of Public Health& Environment's Air Pollution Control Division for
emissions from the loading rack and oil/condensate tanks. Also.see attached e-mail to Mr. Mark Marcia regarding APEN
requirements for acid scrubbers associated with the recycle operation. Please copy your submittal to this Department.
Due to groundwater flow being opposite of the expected direction at initial well placement,additional groundwater monitoring
wells need to be sited and completed down gradient of the facility's operations. See attached groundwater elevation map. This
matter was discussed via telephone with your consultant. Mr.Craig Mullica with CGRS. Please provide expected date of
completion for installation of down gradient groundwater monitoring wells.
The Department will follow-up with High Sierra during the next routine inspection to ensure the above action.are completed
If you have any questions regarding this inspection. please contact me at 304-6415,extension 2219.
Sincerely.
•
Troy E. Swain
Waste Program Coordinator
Environmental Health Services Division
Attachments(4): inspection checklist,photo of unloading pad& Pt.C readout.groundwater elevation map. August 23. 22111 I e-mail ru
M.Marcin re APEN from HCL Scrubbers)
cc: Denise Onyskiw.COGCC. 1120 Lincoln St..Ste. 801.Denver.CO 80203(via e-mail)
Jerry Henderson.CDPHE-HMWMD Solid Waste Unit(via e-mail)
63Yrunua'1 call- o c726)/1— 01 7
C- 7
INJECTION WELL INSPECTION REPORT CHECKLIST
FACILITY OWNER/OPERATOR: i--V Y' S ("et r,:.• Stf.,,cC•> Z C.
FACILITY NAME: C -7 CSC , c..--7,4) FACILITY ID: / 5y 3 USR:
CS-- fZ3 - 32Z-o'7
DATE: IC 13 Zcl1 INSPECTION:@SA WELL CLASS: I/g)
CONTACT PERSON:'-i")—% Co-Se:G..4 PHONE: 76
"l''to — 5(5—
ADDRESS: 2L-1 \N. sr , S,,
EVCPI
-`Z I S 6
FACILITY LOCATION: 3 5 e 5 1 i e 7 L, (y,u��c. (s. )1;4,s ie Yc.e.1c..+1
TRUCK DELIVERIES/DAY- -; BARRELS INJECTED/DAY- 6 5-0z)
INJECTION PRESSURE: gfYO psi (LIMIT 1 1 I (v psi)
SOLIDS/SEDIMENT DISPOSAL NAME: 5! (4- 6j,,,..?k L f.'")
PETROLEUM CONTAMINATED SOILS: :v 1./N ON-SITE STORAGE: Y
CONDITION OF CONCRETE RECEIVING PAD: o k
LEAK DETECTION SYSTEM MONITORING:(J/ N FREQ/RECORDS:
wc - k(.1
* 1 s#
GROUNDWATER MONITORING WELL CONDITION: OLALF1^e.,+ REPORTS: &./N
CHEMICALS STORED/N EMERGENCY RELEASES: Y (ND ISDSD)< N
ENVIRONMENTAL SPECIALIST:
'(� wA +/%--)
M1 l - 2 / II i?okk
PERSONS PRESENT AT TIME OF INSPECTION: bc,‘„, 1 c ` I
CURRENT CONDITIONS/COMMENTS: , Ijy,• �,,
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Troy Swain
From: Troy Swain
Sent: Wednesday,August 24,2011 2:47 PM
To: 'mmarcinOhighsierraenergy.com'
Cc: Kim Ogle;Lauren Light; Phillip Brewer; 'R. K. Hancock'
Subject: RE: HCI scrubber emissions from HCL tanks at injection facilities.
Mark Marcin
High Sierra Water Services LLC
RE: HCI scrubber emissions from HCL tanks at injection facilities.
Dear Mark, I received a copy of your July 15,2011 e-mail regarding chemical storage tanks at the injection well facilities
that are co-located with the water recycle operations.
An Air Pollutant Emission Notice(APEN)will need to be filed for the hydrochloric acid scrubber emissions. The scrubbers
control efficiency should be high,however,emissions reporting level is based on uncontrolled actual annual emissions.
See following excerpt from Air Quality Control Commission REGULATION NUMBER 3, STATIONARY SOURCE PERMITTING
AND AIR POLLUTANT EMISSION NOTICE REQUIREMENTS(5 CCR 1001-5).
11.Air Pollutant Emission Notice (APEN)Requirements
II.A.Air Pollutant Emission Notices for New, Modified, and Existing Sources: Except as specifically exempted in Section
II.D., no person shall allow emission of air pollutants from,or construction,modification or alteration of, any facility,
process,or activity which constitutes a stationary source,except residential structures,from which air pollutants are,or
are to be,emitted unless and until an Air Pollutant Emission Notice and the associated Air Pollutant Emission Notice fee
has been filed with the Division with respect to such emission. Each such notice shall specify the location at which the
proposed emission will occur, the name and address of the persons operating and owning such facility, the nature of
such facility, process or activity,an estimate of the quantity and composition of the expected emission and other
information as required in the current Air Pollutant Emission Notice form.
II.B.3.b.Non-criteria Reportable Pollutants: for non criteria reportable pollutants,Air Pollutant Emission Notices are
required for each individual emission point with uncontrolled actual emissions that exceed the de minimis levels as
determined following the procedures set forth in Appendix A.
Appendix A: Reporting Threshold for HCL(Scenario 1, Bin A, Hazardous Air Pollutant/Non-criteria reportable air
pollutant)is 50 pounds per year.
Compliance with Air Quality Control Commission Regulations is required by your County land use permits and Section
23.2-250 B.of the Weld County Code.
If you have any questions regarding the APEN filing process, please contact the Colorado Air Pollution Control Division at
303-692-3100.
Troy E.Swain
Environmental Health Specialist
Weld County Dept. of Public Health& Environment
1555 N. 17th Avenue
Greeley,CO 80631
(970)304-6415, ext. 2219
1
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