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Home My WebLink About20160978.tiff SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIEW(USR)APPLICATION FOR PLANNING DEPARTMENT USE DATE RECEIVED: RECEIPT#/AMOUNT# /S CASE#ASSIGNED: APPLICATION RECEIVED BY PLANNER ASSIGNED: Parcel Number 0 7 2 3 2 2 _ 0 0 0 0 0 6 (12 digit number-found on Tax I.D.information,obtainable at the Weld County Assessor's Office,or www.co.weld.co.us) Legal Description 1576 SE4 22 7 58 EXC OG&M(4R) , Section 22 ,Township?North, Range 58 West Zone District:A , Total Acreage:2.75 , Flood Plain:N/A , Geological Hazard: N/A , Airport Overlay District:N/A FEE OWNER(S)OF THE PROPERTY: Name:John A Johnson Work Phone# Home Phone# Email Address:18761 County Road JJ Address: City/State/Zip Code Fort Morgan, CO 80701-9647 Name: Work Phone# Home Phone# Email Address: Address: City/State/Zip Code Name: Work Phone# Home Phone# Email Address: Address: City/State/Zip Code APPLICANT OR AUTHORIZED AGENT(See Below:Authorization must accompany applications signed by Authorized Agent) Name:Dena Lund-Sterling Energy Investments LLC Work Phone# 720-382-1653 Home Phone# Email dlund@sterlingenergy.us Address:1200 17th Street Suite 2850 Address: City/State/Zip Code Denver,CO 80202 PROPOSED USE: GAS COMPRESSOR STATION I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my(our)knowledge. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be �I ded indicatin tat the si natory has to legal authority to sign for the corporation. `' k.)())1, AQt isA (112 I (5 Signature: Owner or Authorized Agent Date Signature: Owner or Authorized Agent Date Raymer Compressor Station Use by Special Review(USR)Application 1.0 Questions from Questionnaire 1.1 Description of Proposed Use This USR application is being submitted by Petroleum Field Services for the Raymer Compressor Station on behalf of Sterling Energy Investments LLC (Sterling Energy). There are currently thousands of oil and gas wells in the Denver—Julesburg Basin most of which are located within Weld County.All of these wells produce varying amounts of gas that needs to be routed through pipelines to processing plants. In order to effectively move the gas through the pipelines it has to pass through multiple compressor stations. A compressor station helps the transportation process of natural gas from one location to another. These compressor stations are placed at varying intervals along the gas pipeline ranging from 40 miles up to 100 miles. The equipment at compressor stations pressurize the gas so that it can be transported to the next compressor station or processing plant. The proposed site is owned by Sterling Energy and is located 1355' N of the intersection of CR-129 and CR-78. The parcel that the site is located at is currently zoned for agriculture with cropland,grassland, and limited residential development in the area. The site includes various compression equipment that will be used to compress and transport natural gas. Please see the Site Plan Map attached as Exhibit A for a more detailed layout and description of the equipment. The compressors on site operate 24 hours a day, 7 days a week, 365 days a year. 1.2 Consistency with the intent of the Comprehensive Plan The Weld County Comprehensive Plan addresses goals and policies for agriculturally zoned properties, oil and gas deposits, as well as environmental pollutants that the compressor site may emit. Goal 6 of the Comprehensive Plan encourages the division of land in agricultural areas to support the continuation of agricultural production. The site is currently owned by Sterling Energy, and used for agricultural purposes. Finally, the Comprehensive Plan addresses the presence of oil and gas deposits in the County and encourages the extraction of oil and gas resources that conserve the land and minimize the impact on surrounding land and the existing surrounding land uses. The proposed addition of compressors to the site conserves land by eliminating the need for an additional separate compressor site elsewhere in Weld County. The proposed use is consistent with Chapter 22 and any other applicable code provisions or ordinance in effect. Section 22-5-100.A. (OG.Goal 1.) states, "Promote the reasonable and orderly exploration and development of oil and gas mineral resources," while Section 22-5-100.B. (OG.Goal 2.) strives to, "Ensure that the extraction of oil and gas resources conserves the land and minimizes the impact on surrounding land and the existing surrounding land uses." Section 22-5-100.B., (OG.Policy 2.9.) outlines the objective to, "Impose protective measures through available state, County and federal regulations to ensure that the mineral operator conducts operations in a manner that will minimize current and future environmental impacts." This Use by Special Review application for a Mineral Resource Development Facility, which is part of a comprehensive gas processing network necessary to move larger volumes of Wage Raymer Compressor Station Use by Special Review(USR)Application gas, due to increases in drilling activity and projected additional production increases anticipated by producers in the Weld County area remains consistent with the goals of Chapter 22. 1.3 Consistency with the intent of the Weld County Code, Chapter 23 (Zoning) and the zone district in which it is located. Oil and gas facilities are allowed as a use by right in the A (Agricultural) Zone District. However, oil and gas support and service operations such as a Compressor Facility require the approval of a Use by Special Review Permit. The proposed use is consistent with the intent of the A (Agricultural) Zone District.Section 23-3-40.A.2 of the Weld County Code provides for Oil and Gas Support and Service. 1.4 Surrounding Uses and Compatibility with Surrounding Uses There are currently no USR permits on the site. The facility does not interfere with the existing use of the area, and remains compatible with the current zoning. 1.5 Details of the Site 1.51 Number of people who will use this site There are no permanent employees on this site. The site is visited by a Sterling Energy employee on a daily basis. The employee is typically not on site for longer than one to two hours at a time. Given the short amount of time an employee is on site, Sterling Energy believes that a permanent water and sewer service is not necessary. The site is monitored 24 hours a day 7 days a week by the supervisory control and data acquisition (SCADA) system at the company's headquarters. 1.52 Number of employees proposed to be employed at this site There will be no full time employees at the Raymer Compressor Station. One employee may visit the site on a daily basis. 1.53 Hours of operation The compressors on site run 24 hours a day 7 days a week on demand. On average one employee will visit the site twice each day in a pick-up truck. Trucks will generally only come to the site during the hours of 8 am to 5 pm unless there is an emergency. 1.54 Type and number of structures to be built on this site There will be up to six compressor units covered by building(s)/enclosure(s), small metering and SCADA building(s)/enclosure(s), small air compressor and MCC building(s)/enclosure(s), inlet slug catcher and separation, condensate and water tanks, connex storage, and future dehydration and treating. Please see the Site Plan attached as Exhibit A for a more detailed layout of all proposed buildings. Wage Raymer Compressor Station Use by Special Review(USR)Application 1.55 Type and number of animals There are no animals on site. 1.56 Kind of vehicles that will access this site and how often A Sterling Energy employee will visit the site twice each day in a pick-up truck. A bobtail trailer will access the site one to two times a month to haul condensate or water from the site. 1.57 Fire Protection The Raymer-Stoneham Fire Protection District provides fire protection to this area. A referral packet will be sent to the District by the County. 1.58 Water source on the property There are no full time employees on site. A Sterling Energy employee will visit the site on a daily basis. Due to the lack of employees permanently on site, a water connection is not necessary. Should the status of employees on site change, water would be obtained from a new well on site as appropriate. Bottled water will be available during construction and during operations. 1.59 Sewage Disposal System There is no need for a sewer disposal system. This facility will be serviced regularly for waste removal by employees visiting the site. Should a water source later be required, there appears to be ample space on the lot to provide for an ISDS for sewage disposal. 1.60 Storage or Warehousing Glycol, oil, and methanol are stored on site in 200-500 gallon containers for daily operations. There is storage of up to 1,200 barrels of associated water and condensate liquids in 100-400 barrel containers. Future dehydration and treating may require 1000 gallon TEG storage. 1.6 Proposed Landscaping No landscaping is planned. The site will be partially graveled inside the fence line and re-vegetated with native grass outside the fenced area. 1.7 Reclamation Procedures Upon termination of the proposed project, all equipment would be removed. The ground would be re- graded to accommodate agricultural uses or be re-vegetated to 80%of pre-disturbance vegetative cover in accordance with the COGCC 1000 Series Rules. The pre-disturbance vegetation cover shall be determined by the undisturbed surrounding area. Raymer Compressor Station Use by Special Review(USR)Application 1.8 Storm Water Drainage This site is below 10% increase in imperviousness, so Sterling is requesting an exemption from the requirement of a temporary retention area. Please find the drainage calculations attached as Exhibit B. 1.9 Construction Period Construction of site is already complete and site development will continue. Weld County has been made aware of the status of the site. Implementation of additional compressors to the site could take five years. 1.10 Waste Handling Plan No solid wastes are expected to be generated on site. If daily workloads necessitate waste handling, a 3 CY dumpster will be placed onsite and emptied weekly. Waste fluids are transported to another facility where they are consolidated with similar waste and disposed of according to their waste characteristics. The site is for the compression of natural gas. No vehicles or outside equipment will be washed on site. 1.11 Dust Abatement Plan Dust on this site has not become a nuisance since the compressor station has been online. Dust needs to be kept to a minimum not only for aesthetic reasons but also for the equipment. Excess dust on-site can be detrimental to the compressors and supporting equipment on site. If dust should become a nuisance, then gravel will be added to the site. 7IPage Raymer Compressor Station Use by Special Review(USR)Application 2.0 Operation Standards 2.1 Noise Control The operation of the Compressor Station shall comply with the noise standards enumerated in Section 802 of the COGCC Amended Rules 2008. Noise is emitted from Compressor sites, however, the daily maintenance performed by sub-contractors or Sterling Energy employees will be done by pick-up truck and trailer and typically during normal business hours. The rural setting of the project is preferred to mitigate the effects of noise emissions on the surrounding property owners. Please see Exhibit B for a copy of the Noise Abatement Plan. 2.2 Air and Water Quality All activities will be in compliance with the permit and control provisions of the Colorado Air Quality Control Program, Title 25, Article 7, C.R.S. as applicable. No waste water will be discharged within the site. All water and waste is carried by vehicle off the site. 2.3 Lighting All future permanent lighting on site will be downcast and shielded. Until permanent lighting is installed temporary lighting will be provided for evening maintenance and emergency work. Any source of lighting on the site shall be shielded so that light will not shine directly onto adjacent properties. Nor will direct or reflected light from any source on the project site create a traffic hazard to operators of motor vehicles on the adjacent roads. 2.4 Weed Control The site will be kept free of weeds. The area will be treated if necessary and as practicable to prevent invasion of undesirable species and noxious weeds. 8lPage Raymer Compressor Station Use by Special Review(USR)Application 3.0 Required Permits Weld County A Use by Special Review Permit is required to be approved by the Board of County Commissioners for this location. A Weld County Access Permit has been obtained for the access on to the site. A copy of the approved access permit is attached as Exhibit F. Sterling Energy will submit any additional permits necessary for County Approval. Raymer-Stoneham Fire Protection District The Site Plan and Special Review Use Application will be referred to and reviewed by the Raymer- Stoneham Fire Protection District. Any requested MSDS sheets will be provided to the Raymer- Stoneham Fire Protection District. APEN Air emissions permit documentation can be found in Exhibit D. Spill Prevention,Control,and Countermeasure(SPCC) The approved SPCC plan is attached as Exhibit E. Certificate of Conveyances The Certificate of Conveyances that is less than 30 days old is attached as Exhibit G. Wage Raymer Compressor Station Use by Special Review(USR)Application 4.0 Traffic Traffic level is anticipated to be approximately two vehicles per day. A bobtail trailer will access the site one to two times a month to haul condensate or water from the site. 10IPage Raymer Compressor Station Use by Special Review(USR)Application 5.0 Fire and Emergency Response There is adequate provision for the protection of the health, safety, and welfare of the inhabitants of the neighborhood and County. All roads leading to the site and within the site will be designed and maintained to support fire apparatus. A turnaround may be constructed as necessary to accommodate fire apparatus. In addition to above-referenced rules and regulations,Sterling Energy is also subject to COGCC Rule 6064 pertaining to Fire Prevention and Protection. Sterling Energy has support personnel in the field or on call at all times to provide technical assistance in fire prevention and elimination. Sterling also maintains a call line with an operator available to assist in case of emergency. 11IPage Noise Abatement Plan- Raymer Compressor Station Introduction The Raymer Compressor Station is a Sterling facility located in Weld County. This facility is needed to help transport the increasing amounts of natural gas to processing facilities where it is then prepared for sale to market. Sterling will take all necessary actions to attenuate noise originating from this site in order to comply with COGCC noise regulation.The following plan outlines how noise is mitigated at the Raymer Compressor Station Site. Location and Surrounding Land Use The proposed Raymer Compressor Station is located approximately 1355' N of the intersection of CR- 129 and CR-78 in an area zoned for agriculture with limited residential development. Noise Regulation,Assessment,and Attenuation Under the current COGCC regulations, permissible noise levels are detailed. This facility is considered a remote location, where there are no reasonably proximate occupied structures. Therefore the light industrial standards apply.Sterling will ensure the installed equipment complies with COGCC regulations and sound level measurement guidance. The gas compressors will be located near the center of the property to provide ample spacing for noise attenuation between the compressors. If necessary, engines can be fitted with hospital-grade mufflers to suppress noise and comply with the statutory limits. WELD COUNTY ACCESS PERMIT to CO0 Weld County Public Works Dept. � � Phone: (970) 304-6496 1111 H Street After Hours: (970)356-4000 P.O. Box 758 'oattire p Emergency Services: (970)304-6500 x 2700 Greeley, CO 80632 GEC/ �Q� Inspection: (970) 304-6480 4/C V4° Permit Number: AP15-00433 Issuance of this permit binds applicant and its contractors to all requirements,provisions,and ordinances of Weld County,Colorado. Project Name: PRE15-0187-Raymer comp.st Expiration date: 03/04/2016 Applicant Information: Property Owner Information: Name: Abby Rimel Name: John A.Johnson Company: Sterling Energy Company: John A.Johnson Phone: 720-881-7100 Phone: 970-867-5128 Email: arimel@sterlingenergy.us Email: Location: Proposed Use: Access is on WCR: 129 Temporary: Nearest Intersection WCR: 129 &WCR: 78 Single Residential: Distance From Intersection: 1345 Industrial: Number of Existing Accesses: 1 Small Commercial: } Oil&Gas: J Planning Process: Large Commercial: Road Surface Type&Construction Information: Subdivision: Road Surface: Gravel Field(Agricultural Culvert Size&Type: 15"CMP/RCP min. Only)/Exempt: Start Date: Finish Date: Materials to Construct Access: road base Required Attached Documents Submitted: Traffic Control Plan: Yes Certificate of Insurance: Yes Access Pictures: Yes A copy of this permit must be on site at all times during construction hours Daily work hours are Monday through Friday DAYLIGHT to%2 HOUR BEFORE DARK(applies to weekends if approved) Approved MUTCD traffic control/warning devices are required before work begins and must remain until completion of work Special Requirements or Comments Parcel 072322000006. Utilize existing access point on CR 129(1-O&G)located approx.1345 ft. North of CR 78. Approved by: DOallYU9nedbyMorgan Weld County Public Works Date: 9/10/2015 Gabhert DN:cn-Morgan Gabber.o,o, emall-mgahhert@weldgovcom, c-US Date:101509.1015:06:5 I OS'00' Print Date-Time: 9/10/2015 3:06:17PM Access Permit PW008 Page 1 of 1 FOR COMMERCIAL SITES,PLEASE COMPLETE THE FOLLOWING INFORMATION BUSINESS EMERGENCY INFORMATION: Business Name:Sterling Energy Investments LLC Phone:720-881-7100 Address:1200 17th St.Ste 2850 City, ST,Zip:Denver,CO 80202 Business Owner:David Kenyon Phone:720-881-7100 Home Address: City, ST,Zip: List three persons in the order to be called in the event of an emergency: NAME TITLE ADDRESS PHONE Sean Miller Pipeline Foreman 17589 County Road 21 Sterling,CO 80751 970.520.5717 Toby Hasting Pipeline Operator 17589 County Road 21 Sterling,CO 80751 970.520.9937 Rodney Barnes Director of Operations 1200 17th St.Suite 2850 Denver,CO 80202 303.589.6214 Business Hours: Days: Type of Alarm: ( one) Burglar Holdup Fire Silent Audible Name and address of Alarm Company:NA Location of Safe:NA MISCELLANEOUS INFORMATION: Number of entry/exit doors in this building:NA Location(s): Is alcohol stored in building?NA Location(s): Are drugs stored in building?NA Location(s): Are weapons stored in building?NA Location(s): The following programs are offere�-�s,a public service of the Weld Coun tiffs Office. Please indicate the programs of interest. I I Physical Security Check Crime Prevention Presentation UTILITY SHUT OFF LOCATIONS: Main Electrical:NA Gas Shut Off:NA Exterior Water Shutoff:NA Interior Water Shutoff:NA Starling Energy Investments LI_C One Tabor Center 1200 17th St. Ste 2850 Denver CO 50202 STERLING Ph 720 831.7100 LNtfUY IIIVES"ML11t6 uc Fax 720.881 710l Jerrie L.White I Q n I�var;Q�Lp 18761 County Road JJ i-1-11g l.O -44r1, ! � Q Fort MorganrColacado$0701 �r l G S eta Lt ( CD SDLD I) RE: Terms for Compressor Station Land Agreement Dear Ms. White: In order for the compressor station land use case USR15-0071 to be heard as currently scheduled, an authorization must be signed for the application to be submitted on your behalf as the landowner. In agreement to sign the authorization letter by Thursday February 25, 2016, Sterling Energy Investment LLC agrees to the following terms for a land use agreement for the site located in Section 1,Township 7 North, Range 62 West: • Payment for use of one acre site described in Exhibit A to be: o $2,000 per year minimum paid annually for up to two compressors o an additional $1,000 per year for a third compressor • Initial term is five years renewable for three additional five year terms • Agreement would terminate if site is no longer in use and equipment is removed 4 Maximum of three compressors on site • Above fee to include easement access in Exhibit A Sin rely, I Dena Lund Exec.VP-Operations& Engineering Sterling Energy Enclosures: Exhibit A: One acre parcel and easement survey .' St•�rling Energy Investments LI.C tAi One Tabor Center 1200 17th St. Ste 2350 Denver CO 50202 STERLING Ph 720 881.7100 L.WI GY nI/L5TMUlTS LL( Fax 720 831.7101 Jerrie L.White 18761.Ceuntlr RuadJi 1 a8 Co um.4-t4 -vaa 31.) or 3crie Sc cg, a -Do I( RE: Weld County Authorization of Permittee Bob White Compressor Station: N2SW Section 1,Township 7 North,Range 62 West Parcel#071501000009 Weld County,Colorado Dear Ms. White: In accordance with Weld County rules, your signature is required authorizing Dena Lund, on behalf of Sterling Energy Investments LLC, to submitIMMIMMIlla Use by Special Review permit application on your behalf. If you should have any questions or require additional information, please contact me at 720-881-7100.Thank you for your consideration of this matter. riirl erely, Dena Lund Exec.VP-Operations& Engineering Sterling Energy I hereby authorize Dena Lund, on behalf of Sterling Energy Investments LLC,to submit on my behalf INNIIIIIIIIIIMMINIS a Use by Special Review permit for the Bob White Compressor Station located in the NZSW of Section 1,Township 7 North, Range 62 West. • r-' ,/ , i vx.,4 , eail << face Sur Ow r SignatureDa- -jv,- r rt L . Print Name STATE F COLOFADO JThri W.Hickenlooper,Governor FAA Larry Wolk,MD,MPH Q• �o Executive Director and Chief Medical Officer r '"I Dedica'ed to protecting and improving the health and environment al the people r)t Colorado I •� + .,_ ve •f 4300 Cherry Creek.Dr,S. Laboratory Services Division � • Denver,Colorado 80'246-1530 810O Lowry Blvd r- e. Phone(303)692-2000 Denver,Colorado 80230-6928 Colorado Department Loca?ed in Glendale,Colorado (003)G92-30g0 of Public Health '.wnv colcrado,gou+cdphe and Environment January 23,2014 Gordon Stevenson Sterling Energy Investments LLC One Tabor Center 1200 17th Street, Suite 2850 Denver, CO 80202 RE: Oil &Gas RICE GP02 General Permit Approval for Package#297739 Dear Gordon Stevenson: The Colorado Air Pollution Control Division approves your company's registration of the equipment described below for coverage under general permit GP02 for natural gas fired reciprocating internal combustion engines (RICE) used at oil and gas sources. Please refer to general permit GP02 for all applicable requirements, limitations, terms and conditions. A copy of the general permit may be obtained via the Internet at the following web address: http://www.colorado.gov/cs/Satellite/CDPHE-AP/CBON/1251596446083 The following Table 1 contains identifying information for the engine to which this registration approval applies. Table 1 Company Name: STERLING ENERGY INVESTMENTS LLC Stationary Source "Plant" Name: RAYMER Compressor Station Emissions Point AIRS ID: 123-0270-004 Stationary Source Location: NESE SEC 22 T7N R58W RAYMER, 2.9 MI S OF WELD COUNTY APEN Document#: 297737 APEN Signature Date: 9/5/2013 The following Table 2 contains specific equipment information and process and emissions limits for the engine to which this registration approval applies. Table 2 Engine Manufacturer: Caterpillar Engine Model: G3516B Engine Serial Number: TBD Fuel Consumption Limit: 77.4 Million standard cubic feet per year 12.5 Tons NOx per year Emissions Limits: 3.1 Tons CO per year 5.7 Tons VOC per year Table 3 This engine subject to New Source Performance Standard (NSPS) Subpart: TBD This engine subject to Maximum Achievable Control Technology(MACT) area source TBD requirements for subpart: Is this engine located at a synthetic minor stationary source for Title V Operating Permit, New No Source Review, or MACT requirements? Is this engine located at a synthetic minor stationary source of NOx or CO? (If"yes", stack testing is required for NOx and CO if the engine is equipped with a catalytic emission control No device and the engine's nameplate-rating is greater than or equal to 500 hp). Is this engine located at a synthetic minor stationary source of formaldehyde? (If"yes", stack testing is required for NOx, CO, and formaldehyde if the engine is equipped with a catalytic No emission control device and the engine's nameplate-rating is greater than or equal to 500 hp). If you have any questions regarding this letter, please contact me directly at (303) 691-4089. Sincerely, Oluwaseun Ogungbenle Permit Engineer Stationary Sources Program Air Pollution Control Division [1] If listed as"to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. STATE OF cOLO A.DO John W,hlickentooper,Governor Christopher E.Urbirvi,MD,MPH Executive Director and Ohio!.Medical Officer ee Dedicated to protecting and rrnpfoving the hearth and environment of Iho people or Colorado ,.,, 4300 Cherry Creak Dr.S. Laboratory Services Division • ti�• • Deer,Colorado 80240.1533 5100 Lowry Blvd. s Denver, Phone(303)6922000 Denvor.Colorado 00?30.89?8 Colorado Department Located In Glendale,Colorado (303)692.3090 of Public Heal th nupdrwww,cdphe.etate,ca,ua and Environment Stuart Asselin Sterling Energy Investments Llc One Tabor Center 1200 17Th Street, Suite 2850 Denver, CO 80202- RE: Oil & Gas RICE GP02 General Permit Approval for APEN Document# 279468 Dear Stuart Asselin: The Colorado Air Pollution Control Division approves your company's registration of the equipment described below for coverage under general permit GP02 for natural gas fired reciprocating internal combustion engines (RICE) used at oil and gas sources. Please refer to general permit GP02 for all applicable requirements, limitations, terms and conditions. A copy of the general permit may be obtained via the Internet at the following web address: http://www.coloraclo.gov/cs/Satellite/CDPHE-AP/CBON/1251596446083 The following Table 1 contains identifying information for the engine to which this registration approval applies. Table 1 Company Name: STERLING ENERGY INVESTMENTS LLC Stationary Source NEW RAYMER C.S. "Plant"Name: Emissions Point AIRS 123-0270-003 ID: Stationary Source NESE SEC 22 T7N R58W Location: RAYMER, 2.9 MI S OF WELD COUNTY Page 1 of 3 APEN Document#: 279468 APEN Signature Date: 9/7/2012 The following Table 2 contains specific equipment information and process and emissions limits for the engine to which this registration approval applies. Table 2 Engine Manufacturer: Caterpillar Engine Model: G3512TALE Engine Serial Number: 4KC00334 Fuel Consumption Limit: 55.00 Million standard cubic feet per year 15.6 Tons NOX per year Emissions Limits: 14.7 Tons CO per year 2.3 Tons VOC per year The following Table 3 contains regulatory applicability and stationary source classification determinations for the engine to which this registration approval applies[1]. These classifications determine, in part, what specific requirements are applicable under the general permit coverage. If the registered engine is greater than or equal to 500 HP and the stationary source is synthetic minor for NOX, CO or formaldehyde, please reference section V of the general permit for initial compliance testing requirements. Table 3 This engine subject to New Source Performance Standard(NSPS)Subpart: NONE This engine subject to Maximum Achievable Control Technology (MACT) area source NONE requirements for subpart: Is this engine located at a synthetic minor stationary source for Title V Operating No Permit, New Source Review, or MACT requirements? Is this engine located at a synthetic minor stationary source of NOX or CO? No Is this engine located at a synthetic minor stationary source of formaldehyde? No [1] If listed as"to be determined"(TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. Page 2 of 3 If you have any questions regarding this letter, please contact me directly at(303)692-2277. Sincerely, 1/64(1 Stuart Siffring Environmental Engineer Stationary Sources Program Air Pollution Control Division [1] If listed as"to be determined"(TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. Page 3 of 3 U ° CO O U C C t 0 0 C 0. � G .+ C w u W € C n. U F. �, z yr, C.T. r 'a2J >., c W an U N N N t r 5 .•V., O id E 7.8 r'n ` ALE•' e ❑ ° •> 'C Up [�. F' E ‘O ,° kO •�"° y ..�'. P. : G G O U W CL S 0 y^ O C mmtn -R 00 000— `+ O N. Y 0 P. 'fl U U U °' ° v e .. O p .. N CO o a CO 'Cw y a 'G CA 0 CO P, iS U H > y C• co �. o C ° 'C 0. P. ^� O U. .0 .= i ,O a. . U 5.4 C W w ^ O c°i .C ou c.. ° Z a,E � o ci)o u T o _ d 6 ° w A r a ¢ a s © a+ y E u CO "`k A `� c�i Y t Q • a1 u fl UM a y 11 v � N e e 0 a ° ea a o • a, . r", a) E " U w w U 4. 0 0. ca a o a� GO i 7 it Q .. 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Q 0. a '� C I aGi I �.. v c la,a 'C I U O O NU C U U axi U I w ^ a) v. • C p h c 0 a •.et aq .C . a y o z > U a) O ., T w E_ o -0 3 c R C o • o y C ec v eci C C U C [ CQ F W C ~ C a a c o " a 4.4� O .. k ::. .� y N w' G cd 7 cai GL 'Ii A W oti ❑ ❑ t,' 3 a u ® N y �— r <C J; C/1 _ U J; _ V,' VJ Request for Detention Exception for Raymer Compressor Station Prepared For: STERLING ENE R G Y COMPANY Sterling Energy Company 1200 17th street, Suite 2850 Denver, CO 80202 Prepared By: PFS • Petroleum Field Services 7535 Hilltop Circle Denver, CO 80221 October 15, 2015 STERLING ENERGY COMPANY �IK Ivrn4um I.IG f.AYICvl Contents 1. General Location and Description 2 1.1. Location 2 1.2. Description of the Property 2 2. Drainage Basins and Sub-Basins 2 2.1. Major Basin Description 2 2.2. Sub-Basin Description 2 2.3. Summary Table 2 3. Detention Exception 3 3.1. Stated Exception 3 3.2. Hydrological Criteria 3 3.3. Runoff Calculation 3 4. Conclusion 3 5. References 4 APPENDIX APPENDIX A Hydrologic Soil Map A-1 NOAA Atlas Point Precipitation Frequency Estimates A-2 Historic Topographic Map A-3 APPENDIX B - Hydrologic Computations Weighted Percent Impervious Calculations B-1 Weighted Runoff Coefficient Calculation B-2 Time of Concentration Calculation B-3 Rational Method Procedure 100-yr Runoff B-4 Rational Method Procedure 100-yr Runoff B-5 Detailed Calculation Reference Equations, Figures and Tables B-6 TO B-8 Drainage Narrative for Raymer Compressor Station Page 1 d STERLING nCc NFCv COiI?nN I-r.7 Pr'III FeYa.n fiNG Se.cn 1. General Location and Description 1.1. Location The Raymer Compressor Station is located in the East% of the Southeast '/ of Section 22, Township 7 North, Range 58 West of the 6th Principal Meridian, County of Weld, State of Colorado. It is specifically located about 25 feet west of Weld County Road 129 and 1100 feet north of Weld County Road 78. There are residential houses located approximately 4000 and 4600 feet to the west of the site. 1.2. Description of the Property The site is approximately 2.75 acres in area and consists of two compressors and accompanying equipment. The existing equipment includes; three storage tanks; two air storage tanks; one inlet separator; three meter houses; one filter separator; one pig receiver; two Conex storage containers; one air compressor; one radiator; one H2S scavenger tank; two antifreeze tanks; two engine oil tanks; two skid drain tank; one radio and light tower; two slug catching vessels; and a compressor canopy. The future equipment for the site includes 3 additional compressors and a dehydrator and treating facility. As determined by the USDA Web Soil Survey, the historical soil on this site is Terry sandy loam (9%) and Weld loam (91%). The hydrologic soil group is type B for the Terry sandy loam and type C for the Weld loam (see Hydrologic Soils Map in Appendix A). The historical site generally slopes from the east to the northwest with slopes ranging from 0 to 3%. The historical site has a percent imperviousness of 2%. The developed site will be a combination of compacted gravel and roofs with a composite percent imperviousness of 46.00% (see calculations in Appendix B for details). 2. Drainage Basins and Sub-Basins 2.1. Major Basin Description There is no Weld County Master Drainage Plan associated with the proposed site and there are no irrigation facilities located within 200 feet of the site. 2.2. Sub-Basin Description Stormwater historically drains from east to northwest of the site based upon USGS topographic maps (see Historical Topographic map in Appendix A). Stormwater that falls on the 2.75 acre on-site basin generally flows to the northwest corner of the basin, where it releases onto the surrounding field. Offsite stormwater to the north and west flows away from the site. Offsite stormwater from the south and east of the site flows unobstructed across the site following the historic drainage pattern. 2.3. Summary Table Refer to Appendix B for the summary tables. Drainage Narrative for Raymer Compressor Station Page 2 STERLINGC ►l T P A N Y 7 -►iMobum�Ie d Serrtn-. 3. Detention Exception 3.1. Exception According to Weld County Code Ordinance 2015-11, the addition of Section 23-12-30 states that no stormwater detention (and therefore no drainage report)will be required for"Non- Urbanizing areas where the total project stormwater runoff of less than or equal to, 10 cfs for the 1-hour, 100 year, storm event." 3.2. Hydrologic Criteria In order to analyze the total project runoff of this site to show that the listed exception is met, the rational method was used to compute the runoff since the on-site basin is less than 160 acres (2.69 acres). The weighted percent imperviousness and runoff coefficient were calculated for the onsite basin using USDCM tables RO-3 and RO-4, and equation RO-6 and RO-7. The time of concentration was calculated using USDCM table RO-2 and equations RO-2, RO-3 and RO- 4. As indicated in the NOAA Atlas in Appendix A, the associated one hour point rainfalls for a 100 year storm event for this site is 2.93 inches. This value was used to calculate the intensity, I, for the rational method using equation RA-3 for each basin. 3.3. Runoff Calculation The maximum flow rate for the 100-year storm event was calculated using equation RO-1. For a 100-year storm the maximum flow rate was calculated to be a total of 8.07 cfs. The time of concentration was calculated considering the basin to be non-urbanized. Please see Hydrological Computations in Appendix B for details. 4. Conclusion The runoff calculations for this site were performed according to the Urban Storm Drainage Criteria Manuals(USDCM). Since the calculated value for the total project runoff is less than 10 cfs, this site falls under exception 10 of Section 23-12-30 subsection F of the Weld County Code (as stated in section 3.1). Additionally, since the site is surrounded by a predominantly undeveloped agricultural field, we believe that the relatively small amount of stormwater flowing from this site does not pose a risk to the public health, safety and general welfare, and will not adversely impact the public right of way or surrounding properties. Therefore it is our understanding that this site should not require detention facilities or a complete drainage report. Drainage Narrative for Raymer Compressor Station Page 3 1'1 STERLING PFS)'t E V E R".• M r•A y �•IH_ F.•nde.m IIs10 L••ce, 6. References 1. Weld County Code 2. Weld County Code Ordinance 2015-11 3. Urban Storm Drainage Criteria Manual Vol. 1, 2 and 3; Urban Drainage and Flood Control District; Latest Revision 4. 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' fO E m E 5 y as 'Ai 8•° O a°0f° 5O y > — 2 E � «(� H S W •E co d E cnn50 2 n-5a as o HL°. v°) co cn `o 0c H of .E"5 0 Z O >` Ts N O w C/) V• o >,° C N J j cn OE c° ° o a) a mU a O I Eco m > . 0 V ,>• C CO a N C ce c ra 0 p 8 O N N �j v -om N 4' O 2 .C z to a) To ° CC ct d l0 N �' Q: O TS V ❑ O N N C N o' (n .(1 . a 0 0 ❑ Z .- co p 0_ E n 2 J 9 < O a 2 C Q y L }} `( 7 _ i • .5). .1A (9 r m W J m a) Ii a N as Ts c c c o 0 C 0 v "E 4 < O C C C7 Q C < g m 8 0 U ❑ Z C <\ a\ m\ 00 0 O ❑L Z.47 C < a m [0 O 40 03 40 III o < (n 2• O • to, W 7 to N O 2a V 1O Hydrologic Soil Group—Weld County,Colorado,Northern Part Raymer Compressor Site Hydrologic Soil Group Hydrologic Soil Group—Summary by Map Unit—Weld County,Colorado,Northern Part(CO617) Map unit symbol I Map unit name Rating Acres In AOI Percent of AOI 64 Terry sandy loam,0 to 3 B 0.2 9.0% percent slopes 77 Weld loam,0 to 6 percent C 2.4 91.0% slopes Totals for Area of interest 2.7 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes(A/D, B/D, and CID). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential)when thoroughly wet. These consist mainly of deep,well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture.These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition USDA Natural Resources Web Soil Survey 9/1/2015 Conservation Service National Cooperative Soil Survey Page 3 of 4 Hydrologic Soil Group—Weld County,Colorado,Northern Part Raymer Compressor Site Component Percent Cutoff: None Specified Tie-break Rule: Higher giDA Natural Resources Web Soil Survey 9/1/2015 Conservation Service National Cooperative Soil Survey Page 4 of 4 9/1/2015 Precipitation Frequency Data Server NOAA Atlas 14,Volume 8,Version 2 Location name:Raymer, Colorado, US* nurin Latitude:40.5565°, Longitude:-103.8415° Elevation:4835,. � +tt* � s •source:Google Maps gyp„ POINT PRECIPITATION FREQUENCY ESTIMATES Santa Pence.Deborah Martin,Sandra Pavlovic,Ishani Roy,Michael St.Laurent,Cad Trypaluk, Dale Unruh,Michael Yekta,Geoffery Bonnin NOAA,National Weather Service,Silver Spring,Maryland PF tabular I PF graphical I Maps & aerials PF tabular I PDS-based point precipitation frequency estimates with 90%confidence intervals (in inches)1 1 Average recurrence interval(years) Duration!' 1 2 5 10 25 I 50 I 100 200 I 500 1000 5-m in 0.272 0.329 0.431 0.526 0.670 0.792 0.923 1,07 1,27 1.44 (0.223-0.337) (0.269-0.407) (0.352-0.535) (0.426-0,656) (0.525.0.887) (0.600.1.06) (0.670-1.27) (0.735-1.52) (0.834-1.87) (0.909.2.13) - 10-min 0.399 0.482 0.632 I 0.770 0.981 1.16 1.35 1.56 1.86 2.10 (0.327-0.493) (0.394-0.596) (0.515-0.784)1(0.623-0.961) (0.769-1.30) (0.879-1.55) (0.981-1.86) (1.08-2.22) (1.22-2.73)t (1.33-3.12) 15-min 0.487 0.588 0.770 0.939 1.20 1.41 1.65 1.90 2.27 2.56 (0,399.0.601) (0.481.0.727) (0.628-0.956) (0.760.1.17) (0.938-1.58) (1.07-1.90) (1.20-2.27) (1.31-2.71) (1.49-3.33) (1.62-3.81) 30-min 0.689 0.827 1.08 1.31 1.67 1.97 2.29 2.65 3.16 3.58 • (0.565-0.852) (0.677-1.02) (0.878-1.34) (1.06.1,63) (1.31.2.21) (1.49-2.64) (1.67-3.17) (1.83-3.78) (2.08-4.65) (2.27-5.31) 60-min (0.681-1.03) 1.02 1.36 1.67 2.13 2.52 2.93 3.37 4.00 4.50 (0.681.1.03) (0.838-1.27) (1.11-1.69) (1.35-2,09) (1.67-2.82) (1.91-3.37) (2.12-4.03) (2.32-4.79) (2.62-5.87) (2.85-6.68) 2-hr 0.973 1.22 1.65 2.04 2.60 3.07 3.56 4.09 4.83 5.42 (0.802-1.19) (1.00-1.50) (1,35-2.04) (1.66.2.52) (2.05-3.40) (2.34-4.06) (2.60-4.85) (2.84-5.75) (3.20-7.01) (3.47-7.96) 3-hr 1.02 1.30 1.79 2.22 - 2.84 3.35 3.87 4.43 5.20 5.81 (0.844-1.25) (1.08-1.59) (1.48-2.20) (1.81-2.73) (2.24-3.68) (2.56-4.39) (2.84.5.23) (3.09-6.18) (3.46.7.49) (3.75.8.48) 6-hr 1.15 1.46 2.00 2.46 3.12 3.65 4.20 4.77 5.56 6.18 (0.955.1.39) (1.22.1.77) (1.65-2.43) (2.02-3.01) (2,47-4.00) (2.81-4.74) (3.10-5.61) (3.36-6.58) (3.74-7.91) (4.02-8.92) 12-hr 1.37 I 1.66 2.17 2.61 3.25 3.78 4.33 4.91 5.73 6.37 ( (1.15-1.65) (1.39.2.00) (1.80-2.62) (2.16.3.16) (2.60-4.14) (2.93-4.87) (3.23-5.74) (3.49-6.71) (3.89-8.07) (4.20.9.09) L 2441r I 1.62 1.90 2.38 2.81 3.46 3.99 4.56 6.17 5.02 6.71 __.1 (1.37-1.94) (1.60.2.27) (2.00-2.85) (2.34-3.39) (2.79-4.37) (3.13-5.11) (3.44-5.99) (3.71.7.00) (4.14.8.40) (4,47.9.47) 2-day (1.57-2.19) 2.16 2.68 3.13 3.79 4.33 4.90 5.50 6.33 6.99 (1.57-2.19) (1.82-2.55) (2.25-3.18) (2.82.3.74) (3.08-4.72) (3.42-5.47) (3.72-6.36) (3.99.7.35) (4.40-8.72) (4.71-9.75) LS day J 2.02 2.33 2.85 3.30 - 3.97 4.51 5.08 5.69 6.63 + 7.19 (1,72-2.38) (1.97-2.74) (2,41-3.37) (2.78-3.92) (3.23-4.92) (3.58-5.67) (3.88-6,56) (4.15-7.56) (4.57-8.94) J(4.88-9.98), 4-day 2.16 2.46 2.99 3A5 4.12 4.67 5.24 5.84 6.68 7.35 (1.84-2.53) (2.10-2.89) (2.54-3,52) (2.91-4.08) (3,37-5.08) (3,71.5.84) (4.01-6.73) (4.28.7.73) (4.69.9.10) (5.01-10.1) 7-day 2.46 2.81 3.40 3.90 4.60 5.15 5.71 6.30 7.08 7.70 (2.11-2.87) f (2.41-3.29) (2.90-3.98) (3.30-4.58) (3.76-5.60) (4.11.6.36) (4.40-7.25) (4.64-8.22) (5.01-9.53) (5.29-10.5) L10 bialy 2.74 3.14 3.78 4.31 5.05 5.62 6.18 6.76 7.52 8.10 I (2.36-3.19) (2.89-3.65) (3.23-4.40) (3.67-5.05) (4.14-6.09) (4.50-6.89) (4.78-7.78) (5.00.8.76) (5.34-10.0) (5.61-11.0) 20 day 3.61 4.10 4.88 5.51 6.37 7.00 7.63 8.26 9.04 9.62 J (3.12-4.16) (3.54-4.73) (4.20-5.64) (4.72.6.40) (5.25-7.59) (5.65-8.48) (5.94-9.48) (6.16.10.5) (6.49-11.9) (6.74-12.9) 4.35 4.93 5.83 6.56 7.52 8.23 8.91 9.58 - 10.4 11.0 30-day (3.78-4.99) (4.27-5.65) (5.04-6.71) (5.63-7.58) (6,22-8.90) (6.66-9.90) (6.97-11.0) (7.19-12.2) (7.52-13.6) (7.78-14.7) 45-day 5.29 5.99 7.08 7.94 9.06 9.86 10.6 11.3 12.2 12.8 (4.60-6.03) (5.21-6.83) (6.14-8.11) (6.85-9.13) (7.51-10.6) (8.01-11.8) (8.34-13.0) (8.55-14.3) (8.86-15.8) (9.10-17.0) 60-day 6.07 6.90 8.18 9.17 10.4 11.3 12.1 12.9 13.7 14.3 (5.30-6.90) (6.01-7.85) (7.11-9.33) (7.92-10.5) - (8.65-12.2) (9.20-13.4) (9.55-14.7) J(9.73-16.1) (10.0-17.7) (10.2-18.9) 1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS). Numbers in parenthesis are PE estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates (for a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more Information. Back to Top httpl/hdsc.nws.naaa.gov/hdsc/pfds/pfds_xintpage-Mml?lat=40.5565&lom-103.8415&data=depth&units=engiish&series=pds 1/4 9/1/2015 Precipitation Frequency Data Server PF graphical PDS-based depth-duration-frequency (DDF) curves Latitude:40.5565°, Longitude: -103-8415° 16 r r r r r r r I i r r I I I- . A,eII recurrence 14 s i ., s r....; e..•i•• 0 L t L -c L E E E B E N rh Ib rt., c -o -0-0 v v v v v v in o LA O O ..-I IN N A 4t-I. 6 6 0 Lin 6 ,I r-i rn I.C. p-I N n1 V ID Duration 16 r r r I i r r • • .-. 12 ... ........ . c • Duration a10 y — 5-min — 2-day — 10-min 3-day y 15-min 4-day - - 30-mm — 7-day u 6 -- 60-min — 10-day•a 4 - __--- — 2-nr — 20-day ____,--,-. — 3-hr — 30-day 2 = — 6-hr — a5 day _ _ — 12-hr — 60-day 0 t 1 i t t i r i — 24-hr 1 2 5 10 25 50 100 200 500 1000 Average recurrence interval(years) NOAA Atlas 14,Volume 8,Version 2 Created(GMT):Tue Sep 1 20:36:47 2015 Back to Too Maps & aerials Small scale terrain i-: ~ . 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'Y<r 4'�7""�-� Crtlhu ,' /t laf\, 50 km Map Report a reap error Large scale terrain ClO 1;9] C IIII I III0 re 1 re I is 83 r5 i® El 2 km Map .Report a map error Large scale map .__ ® ez lid] C WI ® Ml 52 i_5i] I t ss =11 III re re 76 Et El t® Or 2 km Map Report s map.error La • , scale aerial t• I I http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=40.5565&lon=-103.8415&data=depth&units=english&series=pds 3/4 9/1/2015 Precipitation Frequency Data Server 411 G =O V Y Lin; Imagery @ Report a map error: Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service Office of Hvdroloalc Development 1325 East West Highway Silver Spring,MD 20910 Questions?:HDSC.Questions(a?noaa.aov Disclaimer httpY/hdsc.nws.rwaa.govRxisc/pfds/pfds_printpage.hlml?lat=40.5565&lor�-103.8415&data=depth&units=english&series=pds 4/4 HISTORIC TOPOGRAPHIC MAP RAYMER COMPRESSOR STATION f • ,. i. --j ``,�, _ _ ... 1 Ii ---- r \ r Ila \� �f• i i �..--'---...�_j rr `., •�goo, \ \ \ \ -� •\ �\ SITE ~ `. 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Li. v Z. aq U le II Q W F ¢ W'. 6 Raymer Compressor Station STERLING PFS COMPOSITE BASIN-WEIGHTED "%IMPERVIOUS"CALCULATIONS REF: Weld County Engineering and Construction Criteria Table 5-3 Recommended Percentage Imperviousness Values Table 5-3 Recommended Percentage Imperviousness Values Land Use or Surface Characteristics Percentage Impervious Business: Commercial areas 95 Neighborhood area 85 Residential: Single-family See UDFCD Manual Multi-family(detached) 60 Multi-family (attached) 75 Half-acre lot or larger See UDFCD Manual Apartments 80 Industrial: Light areas 80 Heavy areas 90 Parks,cemeteries 5 Playgrounds 10 Schools 50 Railroad yard areas 15 Undeveloped areas*: Historic flow analysis 2 Greenbelts, agricultural 2 Off-site flow analysis 45 (when land use not defined) Streets: Paved 100 Gravel 40 Recycled asphalt 75 Drives and walks 90 Roofs 90 Obtained from the runoff chapter of the UDFCD Manual(Volume 1},Table RO.3 Appendix B Hydrologic Computations 10/15/2015 Page B-6 6 Raymer Compressor Station STERLING PFS►'� COMPOSITE BASIN-WEIGHTED WEIGHTED "C"CALCULATIONS REF: USDCM V.1 Runoff Table RO-3 Recommended Percentage Imperviousness Values CA =K A + (1.31i3 —1.44i 2 +1.1351—0.12)for C,r≥0,otherwise CA=0 (RO-6) Ca) =Kcp±(0.85313 —0.786i2 +0.7741+0.04 (RO-7) CB =(CA+Ca))/2 in which: =%imperviousness/100 expressed as a decimal(see Table RO-3) C.4=Runoff coefficient for Natural Resources Conservation Service(NRCS)Type A soils CB=Runoff coefficient for NRCS Type B soils CcD=Runoff coefficient for NRCS Type C and D soils KA=Correction factor for Type A soils defined in Table RO-4 KcD=Correction factor for Type C and D soils defined in Table RO-4 Table RO-4--Correction Factors Ka and Ka)for Use with Equations RO-6 and RO-7 Storm Return Period NRCS Soil Type 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year C and D 0 -0.10i+0.11 -0_18/+0.21 -0281+0.33 -0.331+0.40 -0_39i+0.46 A 0 -0.081+0.09 -0.141+0.17 -0.191+024 -0.22i+0.28 -0.251+0.32 Appendix B Hydrologic Computations 10/15/2015 Page B-7 6 Raymer Compressor Station65 STERLING PFS►� COMPOSITE DEVELOPED BASIN-Rational Method Procedure REFERENCE USDCM VOL.1 RUNOFF tc =ti +t, (RO-2) t — 0.345(1.1—CS WI (RO 3) a 5033 V=CA," (RO-4) in which: V=velocity(ft/sec) =conveyance coefficient(from Table RO-2) =watercourse slope(tt/ft) t = 130 +10 (RO-5) in which: =maximum time of concentration at the first design point in an urban watershed(minutes) Table RO-2—Conveyance Coefficient, C, Type of Land Surface Conveyance Coefficient,C,. Heavy meadow 2.5 Tillage/field 5 Short pasture and lawns 7 Nearly bare ground 10 Grassed waterway 15 Paved areas and shallow paved swales 20 /= 28.5 P, (RA-3) (I 0+ T',re Q=CIA (RO-1) Appendix B Hydrologic Computations 10/15/2015 Page B-8 SPECIAL USE REVIEW PRE15-00433 STERLING ENERGY COMPANY. RAYMER COMPRESSOR STATION ;tT.T -;;I'm SUMMARY RUNOFF TABLE A LEGEND ""A'IN CONTRIBUTING DIRECT TOTAL DIRECT TOTAL , B C E IINr8 EA1AIIR STATION DESIGN AREA RUNOFF RUNOFF RUNOFF RUNOFF D POINT (ACRES) 10-YR 10-YR 100-YR 100-YR EXISTING MAJOR CONTOUR • (CFS) (CFS) (CFS) (CFS) A=BASIN DESIGNATION -- EXISTING MINOR CONOUR B=AREA IN ACRES PROPOSED MAJOR CONTOUR F 1 2.75 3.43 3.43 8.07 8.07 •C=10-YR COMPOSITE RUNOFF COEFFICIENTS PROPOSED MINOR CONTOUR g; D=100-YRCOMPOSITE RUNOFF COEFFICIENTS - •- BASIN BOUNDARY E=DESIGN POINT DESIGNATION • PROPOSED WELL j `' R �� I; -0.- FLOW ARROW {a E :^TJ:7:„„.,• ;,Fr II EXISTING FENCELINE 444, \ '';'' I 'i 1 1 EDGE�I ROAD 1O 9COUNTY j�' ACCESS ROAD ttr— , , 4., i, . 7:„....).„, 0 3 ; . I ,..____. ni N 0s81 °' - - I Cm 4 2.75.0. • -I- N 0.44,• 59 m R. - e CIE • . 'SO E IA IgN .I NNOIOI• IN , d, I. _ x i ...-.mil EXISTING FENCELINE \ j N. ' I I I, 'wrinPROPOSED DRAINAGE PLAN = AD. DATE: REVISION DESCRIPTION NAME PREPARED FOR, PREPARES NY: ,; STERLING ENERGY COMPANY 811 F�.. 1 — DAAVINL DAIS: OAIr,NE Alnl i Il halwam — - BTERLIN0 PFS • 10-15-15 DRAINAGE PLAN Sg. DRAWN BY SNN IAEI EDEAIIIII NOTE:THE EXISTING TOPOGRAPHY INFORMATION WAS COLLECTED BY J _ Pebkillfr Ser-Aii SYW SECTION22,TOWNSHIP 7 NORTH PETROLEUM FIELD SERVICES ON 06-22-2015. 7535 Mop Chia DRIED IT: RANGE 56 WEST,6TH PM N STEAM ENERGY COAa'ANY Denver,0063221 MCW WELD COUNTY.COLORADO I DPI Hello