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Home My WebLink About20171600.tiffUSE BY SPECIAL REVIEW US R) APPLICATION DEPARTMENT OF PLANNING SERVICES * 1555 N. 17TH AVENUE * GREELEY, CO 80631 www,weldaov.com * 970-353-6100 EXT 3540 * FAX 970-304-6498 FOR PLANNING 0EPARTYENT USE: AMOUNT $ APPLICATION RECEIVED BY DATE RECEIVED: CASE # ASSIGNED: PLANNER ASSIGNED: Parcel Number*: 1 0 5 7. 3 5. 4 _ 0 0- 0 0 2 Address of site: t8295 WCR 35, Platteville, CO 80651 (*A 12 digit nurrber on Tax I.D, information, obtainable at WWW .W Cldgou.cr mi), Legal Description: SE 1/4 Section: 35 Township: 4 N Range: 66 W Zone District: AG Acreage: 124 Floodplain:OYON Geological Hazard:OYON Airport Olerlay:OYON VF W ER(S) OF THE PROPERTY: Name: Paul D. Park Company: DCP Operating Company, LP Phone #: 970-378-6372 Street Address: 3026 4th Avenue Email: pdpark@dcpmidstream.com City/State/Zip Code: Greeley, CO 80631 Name: Company: Phone #: Street Address: _ City/State/Zip Code: Name: Email: Company: Phone #: Street Address; City/State/Zp Code: Email: APPLICANT OR AI THORIZE17 AGENT: (See below. Authorization mustaccorr,any all applications signed byAuthorized Agents) Name: Christina White Company: White Engineering Inc. Phone #: 503-819-1222 Street Address: 3620 W. 10th St., #410 Email: casimoninc@gmad.com City/State/Zp Code: Greeley, CO 60634 PROPOSED USE: DCP Operating Company, LP proposes to expand and install new natural gas processing equipment at the existing Mewbourn Gas Plant located in central Weld County to enhance efficiency and quality of the current natural gas being processed at the existing plant. 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 end correct to the best of my(our)knawledge. Signatures of all fee owners of property must sign this application. If en Authorized Bent 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 included indicating that the signatory has to legal authority to sign for the corporation, Signatur Owner or Authorized Agent Date Signature: Owner or Authorized Agent Date Print Name Rev 4/2016 USE BY SPECIAL REVIEW (USR) APPLICATION DEPARTMENT OF PLANNING SERVICES * 1555 N. 17Th AVENUE * GREELEY, CO 80631 www.weidoov.co t * 970-353-6100 EXT 3540 * FAX 970-304-6498 FOR PLANNING DEPARTMENT USE: AMOUNT $ APPLICATION RECEIVED BY DATE RECEIVED: CASE # ASSIGNED: PLANNER ASSIGNED: Parcel Number*; 1 0 5 7. 3 5. 4 _ 0 0 Address of site: 18455 WCR 35, Platteville, CO 80651 Legal Description: SE 1/4 Zone District: AG Acreage: 124 Floodplain:OYNN Geological Hazard:OYON Airport Overiay:OYON F O OF THE PROPERTY: Name: Paul D. Park Company: DCP Operating Company, LP Phone #: 970-378-6372 _0 0 8 (*A 12 digit number on Tax 1.0. information, obtainable at w w w .w eklgov cord. Section: 35 Township: 4 N Range: 66 0/ Street Address: 3026 4th Avenue City/State/Zip Code: Greeley, CO 80631 Name: Company: Phone #: Email: pdpark@dcpmidstream.com Street Address: _ City/State/Zip Code: Name: Company: Phone #: Email: Email: Street Address: _ City/State/Zip Code: APPLICANT OR AUTHORIZED &GENT, (See below. Authorization must acconpany&/ applications signed byAuthorizedAgents) Name: Christina White Company: White Engineering Inc. Phone #: 503-819-1727 Email: casimonincgmait.com Street Address: 3620 W. 10th St., #410 City/State/Zip Code; Greeley, Co 80634 PROPOSED USE: DCP Operating Company, LP proposes to expand and install new natural gas processing equipment at the existing Mewbourn Gas Plant located in central Weld County to enhance efficiency and quality of the current natural gas being processed at the existing plant. I (We) hereby depose and slate 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 included indicating that the signatory has to legal authority to sign for the corporation. Signatur4., Owner or Authorized Agent Date Signature: Owner or Authorized Agent Date Print Name Rev 4/2016 Correspondence emailed to: (Check one) DATE ?- 7-7a 7 OWNER'S SIGNATURE - LEGAL DESCRIPTION: SUBDIVISION NAME: I can be contacted at the following DEPARTMENT OF PLANNING SERVICES 1555 N 1 lth AVE GREELEY, CO 80631 PHONE: (970) 353-6100, Ext. 3540 FAX: (970) 304-6498 AUTHORIZATION FORM represent DC T. cc' i vir Cc'. L P for the (J�QenilAE��li�ant] (O ner) property located at ‘`\ — . ' 4j, } c f 3 %P q-kteu i l c C O 6'OCS SEC 35 TWN RNG 16 Email: j11 -4,p(1 r 1< The property owner can be contactedat the following Home Work LOT — Bt K 9-10-31-63.1 F (O--S39-\90B Home ¶10- t8-635 T7 Work I70 -53"j-1-79 1 Email: 1 L tc;:IeLt 0C_'cic-'pwtidS CRw1.Law1 ,[41/Agent/Applicant ❑ Property Owner DEPARTMENT OF PLANNING SERVICES 1555 N 17th AVE GREELEY, CO 80631 PHONE: (970) 353-6100, Ext. 3540 FAX: (970) 304-6498 AUTHORIZATION FORM _ viet 1J••-) represent � f � ' 0 �� .�� lv uiitrAFrpdc iui) A U L Pfor the property located at � I } a r C ['t' ner �I _ 1 C ,.r �'��;�� C.o F)06Sr LEGAL DESCRIPTION: SEC 2 - TWN RNG SUBDIVISION NAME: I can be contacted at the following LOT 13LIK -- Home 503 —819 —1 1. Z Work c33-S19-�2 Email: Cck t m o n 1 iA C use0_-,0 l. cowl The property owner can be contacted at the following Home `1737S_.SI Work (1-7 L -1 1 ! Email: 1 c lacy r -v, a c t C c' c rwt i s ' i< w+. c a vv\ 1 Agent/Applicant ❑ Property Owner Correspondence emailed to: (Check one) DATE r-7—Zi t 7 OWNER'S SIGNATURE LEGAL DESCRIPTION: SEC -3 TWN l.lG 6 G SUBDIVISION NAME: I can be contacted at the following DEPARTMENT OF PLANNING SERVICES 1555 N 17th AVE GREELEY, CO 80631 PHONE: (970) 353-6100, Ext. 3540 FAX: (970) 304-6498 AUTHORIZATION FORM c r r o dyvA represent D C P tt cc, {, eii1/App csi�,t} 1- for the property located at 1 0L -Le:( e.•( i.1E31 3 (o letCCU �C�6�� - LOT BL{C — Home 9:70— 313 - ''l-1 r 1 6 Work V( 3 ,2 3 16 I Email: ( r -roc vbel ktW..c_.OwA The property owner can be contacted at the following Home 1 7 -- P._63 Work 1'1 0 ^ 53 c — 1 1 Email \ct gci°y0c Wti(Qs ' fig'{ <01A.1 Correspondence emafled to: Agent/Applicant (Check one) ❑ Property Owner DATE— 7,/ 7 OWNER'S SIGNATURE Introduction DCP Operating Company, LP (DCP) is in the process of expanding operations in Weld County, Colorado. The expansion project will include expanding the existing Mewbourn Gas Plant with several compressors and interconnecting pipelines for the purpose of gathering raw natural gas and preparing it for compression and insertion into commercial sales pipelines. This Major Amendment to a site specific development plan and Use by Special Review (5MJUSR17-83-542) only addresses the expansion of the existing Mewbourn Gas Plant and adding a proposed up -to -100' DCP communications tower. Additional USR permit applications will be submitted for any future compressor stations and pipelines. The existing Mewbourn Gas Plant is located just south of WCR 40 on the west side of WCR 35 south of LaSalle, CO, and northeast of Platteville, CO in central Weld County. • Site address: 18295 WCR 35, Platteville, CO 80651 (Parcel #1057-35-4-00-002 - 118.170 acres) • Site address: 18455 WCR 35, Platteville, CO 80651 (Parcel #1057-35-4-00-008 - 6.22 acres) DCP intends to construct the proposed expansion of the additional natural gas processing equipment during the Summer of 2017 through the Spring of 2018. Ten full-time employees are currently employed at the existing Mewbourn Gas Plant. No additional employees will be required after this new equipment and expansion is completed. The plant will continue to function 24 hours a day, 7 days a week, year-round. A septic system was installed when the original gas plant was constructed to accommodate post -construction sewage. A new water line was also installed by the Central Weld County Water District currently providing potable and process water for all uses, including fire suppression at the Mewbourn Gas Plant. After construction is complete in the Spring of 2018, there will not be additional traffic expected as part of the expansion of the existing Mewbourn Gas Plant and the temporary construction access from CR 38 will be closed. Exhibit D Major Amendment to a Site Specific Development Plan and USR Questionnaire PLANNING QUESTIONS: 1. Explain, in detail, the proposed amendment to the property. DCP Operating Company, LP (DCP) is proposing to expand and install additional natural gas processing equipment at the existing Mewbourn Gas Plant to improve capacity and efficiency at the plant. The proposed equipment is required to expand and enhance the existing natural gas currently being collected from nearby gathering systems, purifies and currently compresses the gas for delivery to sales pipelines and processed at the existing Mewbourn Gas Plant. The gathering system services producers in the Niobrara Shale development. 2. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 22 of the Comprehensive Plan. The proposed use is consistent with the comprehensive plan's intent to foster development of the natural resources of Weld County. 3. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 23 (Zoning) and the zone district in which it is located. The proposed expansion of the existing Mewbourn Natural Gas processing plant is compliant with Chapter 23. Weld County Ordinance provides that oil and gas production facilities are allowed as a matter of right in the agricultural zone district. 4. Describe what type of land uses surround the site. Explain how the proposed use is consistent and compatible with surrounding land uses. The existing site is surrounded by native pasture land and agricultural fields. Once the expansion construction is completed, the disturbed area will be replanted with native grasses compliant with the Weld County seed mix requirements. 5. What are the hours and days of operation? Hours of operation: 24 hours a day, seven days a week, 365 days a year, 6. List the number of full time and/or part time employees proposed to work at this site. The construction crew required to build the expansion and install the new equipment at the existing Mewbourn gas plant will consist of approximately 50-75 people (6-9 months). After the expansion and additional equipment is installed, the existing 10 DCP employees will continue to be employed at the plant full time. This includes operations and maintenance staff that currently service the existing Mewbourn Gas Plant. licensed contractor and transported to a disposal site. DCP will comply with all COGCC regulations concerning site restoration. 16. Who will provide fire protection to the site? The existing gas plant is located within the Platteville-Gilcrest Fire Protection District. Potable water and water for fire suppression was previously purchased from the Central Weld County Water District when the existing gas plant was built and will also service the proposed expansion. DCP does not use foam nor have a foam truck located at the Mewbourn Plant. The standard guidance from the American Petroleum institute, and standard guidance followed by most emergency responders, is that it is normally not possible to put out a pressurized gas fire with water or foam. Furthermore, doing so would create an even more dangerous situation by allowing explosive gases to continue leaking out from the source. The only safe way to put out a pressurized gas fire is to stop all new fuel from entering the fire (via emergency shutoff valves around the plant) and to let the fire burn out. Foam and water -based systems are more typically used to suppress fires in oil storage facilities, where it is often important to contain a fire occurring in and around one storage vessel, in order to prevent the firing spreading to adjacent storage vessels. This facility will have no crude oil storage and limit volumes of any combustible liquids. No foam or water - based suppressants are planned. DCP typically provides more details concerning our fire detection and prevention systems in our building permit submittals for the various buildings that will be built within the process plant, and we will do so for this facility, as well. 17. List all proposed on -site and off -site improvements associated with the use (e.g. landscaping, fencing, buildings, drainage, turn lanes, etc.) and a timeline of when you will have each one of the improvements completed. Silt fence will be immediately installed prior to starting any grading work as part of the proposed expansion construction (site work will be compliant with the approved grading permit and State Stormwater Management Plan). Temporary fencing will be installed around the expansion during construction and the permanent 6' tall chain link fence will be installed at the completion of the expansion surrounding the entire Mewbourn gas plant expansion (6-9 months after construction starts), No off -site improvements are planned as part of the proposed expansion. 18. Describe any new site and equipment lighting. DCP designs to the Weld County lighting guidelines and specifically details all site and equipment lighting to point downward at 45 degrees below the horizontal to minimize glare to neighboring properties 19. Is any additional signage planned? No additional signage is planned after construction completion (safety banners will be posted at the temporary construction entrance but removed upon construction completion). 20. Prior to Operation: a. A signed copy of the Spill Prevention, Control and Countermeasure Plan shall be provided to the Weld County Environmental Health Services Division of the Weld County Department of Public Health and Environment. b. DCP shall develop an Emergency Action and Safety Plan with the Office of Emergency Management and the Fire District. The plan shall be reviewed on an annual basis by the Facility operator, the Fire District and the Weld County Office of Emergency Management. DCP will submit evidence of acceptance to the Weld County Department of Planning Services. ENGINEERING QUESTIONS: 1. Describe how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = 1 trip in and 1 trip out of site) 10 full time employees and construction crew of 50-75 (construction 6-9 months): 70 roundtrips per day in Passenger Cars/Pickups - then reduced back to 10 trips per day after the expansion construction is complete, only the existing 10 full time DCP employees will be accessing the plant daily. One to three large delivery trucks are also expected to continue accessing the existing plant daily after construction completion (1 - 3 roundtrips daily). 2. Describe the expected travel routes for site traffic: Expected travel routes will remain the same as currently being used to access the Mewbourn site. Traffic traveling north and/or south on Highway 85 then traveling east to WCR 35 then traveling north on WCR 35 to the existing Mewbourn Gas Plant. 3. Describe the travel distribution along the routes: 75% of the vehicle traffic travels north on Highway 85 to WCR 35, 25% of the vehicle traffic travels south on Highway 85 then east to WCR 35. 4. Describe the time of day that you expect the highest traffic volumes from above: 7.•00 am - 7:30 am and between 5:00 pm - 5:30 pm daily will be the highest traffic volumes (Monday — Friday). 5. Describe where the access to the site is planned. The existing main entrance into the Mewbourn Gas Plant will remain as the primary access after the expansion of the plant is completed. Access Permit #AP16-00466. The 4 existing ingress/egress points (all approved as part of AP16-00466). 1) Access point at the far north of the property boundary on CR 35 2) Access point at the truck load out area (locked at all times with limited access for delivery trucks) 3) Main Entrance into the existing Mewbourn Plant as shown on the USR Title Sheet (will continue as the main access point after the expansion project is completed) 4) Access point at the most southern edge of the property boundary on CR 35 that allows limited access to the existing meter area The temporary construction access located in the SW corner of the Mewbourn I!! expansion on unmaintained CR 38 will be closed upon the construction completion. 6. Drainage Design: Detention pond summarized in a drainage report compliant with Weld County Code Section 23-12-30 F.1. The original Mewbourn Gas Plant was constructed on the east side of a 124.39 -acre parcel adjacent to Weld County Roads 35 and 38. This area is within a Non -Urbanizing Drainage Area. The plant was built on an existing slope running south -to -north, with drainage from the site flowing downhill to the northwest. The original plant was constructed by a previous gas producer in the late 1980's. That facility was approximately eight acres in extent and still exists on the northern end of the current plant. It was named Mewbourn 1 on some of the maps prepared for previous USR submittal packages. In 2009, DCP expanded the plant with the Mewbourn2 project, which included approximately 25.9 additional acres within the USR boundary for the expansion. The Mewbourn2 Gas Plant was the basis for the Final Drainage Report prepared by Eric Reigel, PE, in 2008. it was built immediately south of the Mewbourn 1 Gas Plant, fronting WCR 35, and also drains to the northwest. Since both portions of the plant are now fully integrated, DCP and Weld County now refer to the overall existing facility as the Mewbourn Gas Plant. Except for two very small portions of land in the northeast and northwest corners of Mewbournl, all areas within Mewbournl and Mewbourn2 drain to the west into a Water Quality Feature (WQF), and then northwest from the outlet of the WQF. The two exceptions are small areas in the north of the Mewbourn 1 Plant that drain to small water quality control features contained by an existing concrete retaining wall along the north fence lines. Those two existing features also eventually drain to the north, and into the irrigation ditch on the north edge of the parcel. The existing main water quality feature was designed to capture 100% of the runoff generated from a 100-year/24-hour storm. Although this requires a volume approximately 10 times that required by the Weld County Code at the time of construction, DCP voluntarily oversized the pond to serve as containment features in the unlikely event of a spill or contaminant discharge from the plant. The existing water quality pond will be enlarged and is currently equipped with a manually operated valve that allows a technician to check the pond for any contaminant sheen after a storm, and then release the detained stormwater if no evidence of accidental contamination is observed. Stormwater is released over a period of three days at a rate below that of historic runoff from a 10-year/1-hour storm. ■ See Drainage Report, Colorado Engineer's stamped/signed Certification - Exhibit L ENVIRONMENTAL HEALTH QUESTIONS: 1. What is the drinking water source on the property? Drinking water is currently and will continue to be provided by Central Weld Water District Existing potable water and plant process water was previously purchased and installed by the Central Weld County Water District (March 24, 2010). During the expansion construction, the contractor will provide bottled drinking water for their construction crews. 2. What type of sewage disposal system is on the property? A new oversized septic system was installed and approved by the Weld County Health Department when the Mewbourn iI Gas Plant was built (Permit #SP -0900170). During the expansion construction, the contractor will provide portable toilet facilities and hand washing stations for their construction crews compliant with the Department of Public Health and Environment's portable toilet policy. 3. If storage or warehousing is proposed, what type of items will be stored: Following are the quantities (existing and new): Amine Storage Tank: Two tanks at 1,000 BBLS Condensate Storage Tank: Eight tanks at 400 BBLS ea Refrigerant Storage Tank: Two tanks at 156 BBLS Hot Oil Storage Tank: Two tanks at 300 BBLS Methanol Storage Tank: Two tanks at 12 BBLS Waste Water Storage Tank: Three tanks at 300 BBLS Produced Water Storage Tank: Two tanks at 210 BBLS Lube Oil Storage for Residue Compressors: Two tanks at 150 BBLS Lube Oil Storage for Refrigeration Screw Compressors: Two tanks at 150 BBLS LP Condensate Storage Tanks: Two tanks at 714 BBLS Used Oil Tanks: Two tanks at 100 BBLS 4. Describe where and how storage and/or stockpile of wastes, chemicals, and/or petroleum will occur on this site. No storage of wastes will occur on the site. Wastes are currently properly containerized prior to removal from the site in a timely manner. Liquid wastes are typically trucked to a refinery for reclamation of the hydrocarbons. Non -hazardous solid waste (such as card board, paper, wood pallets, etc.) is typically sent to a landfill. 5. If there will be fuel storage on site indicate the gallons and the secondary containment. State the number of tanks and gallons per tank. During construction, the contractor will have a 1,000 gallon Diesel storage tank (double - walled) with secondary containment for fueling equipment. This tank will be removed after construction completion. 6. If there will be washing of vehicles or equipment on site, indicate how the wash water will be contained. There will be no vehicular washing at the site. Any equipment washing will contain the water and have a drain going to a partially buried double walled tank. 7. If there will be floor drains indicate how the fluids will be contained. Floor drains will route any fluids to a partially buried double -walled tank. 8. Indicate if there will be any air emissions. (e.g. painting, oil storage, etc.) The majority of the equipment painting will be done offsite. During construction, there will be minor painting & diesel storage tank emissions. 9. Provide a design and operations plan if applicable. (e.g. composting, landfills, etc.) Non -Applicable 10. Provide a nuisance management plan if applicable. (e.g. dairies, feedlots, etc.) Non -Applicable BUILDING QUESTIONq: 1. List the type, size (square footage) and number of existing and proposed structures. Show and label all existing and proposed structures on the USR drawing. Label the use of the building and the square footage. See attached Equipment layout and equipment legend drawings (lists existing Mewbourn equipment and proposed new equipment for the Mewbourn Ill expansion) 2. Explain how the existing structures will be used for this USR. The existing Administration Building/Control Building will be used as part of this USR expansion project. The existing Shop/Maintenance Building will also be used as part of this USR expansion. 3. List the proposed use(s) of each structure. See attached Equipment layout and equipment legend drawings (lists existing Mewbourn equipment and proposed new equipment for the Mewbourn lii expansion) Exhibit J Weld County Road Access Information Public Works approved an Access Permit #AP16-00466 for the main entrance into the existing Mewbourn Gas Plant on 10-14-2016 (DCP is proposing to use the same main entrance once the plant expansion is completed). The existing main entrance into the Mewbourn Gas Plant will remain as the primary access after the expansion of the plant is completed. Access Permit #AP16-00466. The 4 existing ingress/egress points (ail approved as part of AP 16-00466). 1) Access point at the far north of the property boundary on CR 35 2) Access point at the truck load out area (locked at all times with limited access for delivery trucks) 3) Main Entrance into the existing Mewbourn Plant as shown on the USR Title Sheet (will continue as the main access point after the expansion project is completed) 4) Access point at the most southern edge of the property boundary on CR 35 that allows limited access to the existing meter area The temporary construction access located at the SW corner of the property on unmaintained CR 38 will be closed after construction of the Mewbourn expansion is completed. • See Access Permit #AP16-00466 attached WELD COUNTY ACCESS PERMIT Weld County Public Works Dept. 1111 H Street P.O. Box 758 Greeley, CO 80632 Phone: (970) 304-6496 After Hours: (970) 356-4000 Emergency Services: (970) 304-6500 x 2700 Inspection: (970) 304-6480 Permit Number: AP16-00466 Issuance of this permit binds applicant and its contractors to all requirements, provisions, and ordinances of Weld County, Colorado. Project Name: 1MUSR16-83-542 Applicant Information: Name: Christina White Company: DCP Midstream LP c/o White Engineering Phone: 503-819-1222 Email: casimoninc@gmail.com; pdpark@dcpmidstr Location: Access is on WCR: Nearest Intersection WCR: Distance From Intersection: Number of Existing Accesses: 35 35 1500 4 Planning Process: USR 1MUSR16-83-542 Road Surface Type & Construction Information; Road Surface: Gravel Culvert Size & Type: 15" CMP/RCP min. if req. Start Date: Finish Date: Materials to Construct Access: gravel/existing & WCR: 38 Required Attached Documents Submitted: Traffic Control Plan: Yes Certificate of Insurance: Yes Expiration date: Property Owner Information:, Name: Company: Phone: Email: same as applicant Proposed Use: Temporary: Single Residential: Industrial: Small Commercial: Oil & Gas: Large Commercial: Subdivision: Field (Agricultural Only)/Exempt: iZI 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 Yz 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 105735400002 & 105735400008. Utilize existing access points on CR 35 (4 -Industrial) located approx. 385 ft., 1500 ft., & 2210 ft., 2400 ft. North of CR 38. Existing point on CR 35 approx. 2400 ft. North of CR 38 SHALL be gated and locked at all times EXCEPT for seasonal maintenance. Note: CR 35 is a Collector roadway with a 60 ft. setback from centerline. Approved by: M9^.64ry lylu,gan cAbbvt DIV: en=Morgan GabbaL o, ou, amaY=ry1ebber tiinrN yu r.o r n, cY115 Date; ?016.10.11 16:2531 -06 g0' Weld County Public Works Date: 10/14/2016 Print Date -Time: 10/14/2016 4:25:06PM Access Permit PW008 Page 1 of 1 Exhibit K Communications Tower Narrative, Database and Decommissioning Plan In support of the USR Application submitted by DCP Operating Company, LP ("DCP") for the Mewbourn III Gas Plant, DCP submits the following documentation pursuant to Section 23-4-830 of the Weld County Code: I. DCP proposes to construct a radio communications tower up to 100 feet in height at the Mewbourn III Gas Plant site. DCP designs and constructs such towers at each of its facilities to 4ll low for remote monitoring and control of the facilities. It is imperative that the communications tower be located in the immediate vicinity of the site to allow for the transmission of a reliable signal. A secure location within the site is critical because of the life - safety functions associated with the plant's control and emergency shut -down notification features. Telecommunication Antenna Towers within a 10 -nude radius of the site are not in sufficient proximity of the Mewbourn III Gas Plant site to allow for adequate signal transmission. A list of towers within that 10 -mile radius is attached hereto. There are no existing towers within the 10 -mile radius that DCP would be able to collocate on. In addition, due to safety concerns, DCP does not co -locate its transmitters on third -party towers. Because the transmitters are utilized to remotely control the compression and processing of natural gas and other hazardous materials, DCP requires that only DCP personnel be permitted access to its towers and transmitters to prevent intentional or accidental disruption of communication services. 2. The proposed communications tower will not constitute a hazard to aircraft due to its location. 3. The proposed communications tower will be located within the Property (Parcel No. 105735400002) and the entire fall zone for the tower will be located on the Property. 4. As noted in Section 1 of this narrative, DCP does not permit co -location on its radio communication towers for safety reasons. 5. The proposed communications tower will be as short as practicable to allow for sufficient signal transmission and will be constructed out of non -reflective materials. 6. Due to its location, as well as the fact that only DCP transmitters will be located on the tower, the proposed tower should not adversely affect human health. 7. The proposed tower will be no taller than the minimum height required for adequate signal transmission between DCP's radio communication towers located in the vicinity. 8. DCP will ensure that the proposed tower complies will all applicable federal and state regulations. 9. The proposed tower will be professionally engineered to ensure the structural integrity of the tower. 10. The proposed tower will be located within the secure fenced boundaries of the Mewbourn III Gas Plant. 11. Due to DCP's transmission requirements, the proposed tower will be situated in the only feasible location. 12. The proposed tower will be located adjacent to the Mewbourn III Gas Plant, and DCP does not anticipate any additional impact on wildlife caused by the tower. 13. DCP will submit a more detailed decommissioning plan as a condition of approval. Decommissioning Plan In the event operations cease at the site and the plant is shut in, DCP will remove the communications tower and all of its components, Where possible, materials will be reused or recycled. Where required, waste materials for disposal will he removed by a licensed contractor and transported to a disposal site. DCP will comply with all COGCC regulations concerning site restoration. See Tower Database and map attached 3/4/2017 ASR Registration Search Results FederOl C:ammtinirat:ans C,ommISSion { ��!'rigt71C°, I SFajii"1 i1t?rT-,1lF'°, F-rlllrlt-1 j lV['S I For (,i7rv41lilletc r•lrlr:i pt}ilt)i`3 Antenna Structure Registration L > WTB > ASR > Online Str$telns > ASR Search ASR Registration Search Registration Search Results Refine Search PrilttaOie Page Result(s) QueEV Downioa[i Matches 1-10 (of 32) 1224Ct11-20>>] Specified Search Latitude='40-14-40.9 N', Longitude='104-52-29.9 W', Radius=16.1 Kilometers Display: I Basic View 10138687 2 1022978 3 1024496 4 10244537 •I' GO Constructed Constructed Constructed 5 1025889 Constructed 6 1028052 Constructed 7 10597.$..13 Constructed 8 1 Cif 278 Constructed A0465122 NEW CINGULAR WIRELESS SERVICES, INC. A1061360 Verizon Wireless (VAW) LLC A0287503 Music Ventures, LLC, d/b/a Broadcast Media, LLC A0287505 Music Ventures, LLC, d/b/a Broadcast Media, LLC A1031247 CCATTLLC A0816431 American Towers, LLC. A0577758 ROBERT STANLEY PROPERTIES LLC A0821367 SpectraSite Communications, LLC. through American Towers, LLC. 0 1208076 Terminated A0179686 WELD, COUNTY OF 10 1208275 Terminated A0179687 WELD, COUNTY OF Matches 1-10 (of 32) 1 214 INext: 11-2p>>] 40-14-33.0N 104-49-51.0W 40-23-19.0N 104-44-00.0W 40-21-57.0N 104-44-00.0W 40-21-57.0N 104-43-53.0W 40-07-30.7N 104-44-41.0W 40-22-42,4N 104-49-57.9W 40-23-07.0N 104-44-14.0W 40-23-05.1N 104-44-12.5W 40-15-39.9N 104-42-21.8W 40-15-39.9N 104-42-21.8W ICC Site Map DE ADVANCED SEARCH HELP p© = Pending Applicatlon(s) PLATTEVILLE, CO EVANS, CO 60.7 GREELEY, CO 85.0 GREELEY, CO 85.0 FT. LUPTON, 51,5 CO MILLIKEN, 91.4 CO GREELEY, CO 76.2 GREELEY, CO 73.7 LaSalle, CO 112.8 LASALLE, CO 112.8 FAr.,•IF.,irnlnrr7 fnn nr..,ll I lo A nr,,AnrCn..rehlnrrgnni ill in n'7nnn'.-hT.,nc—TOI 4/O 3/412417 Fr:I"El( er..:l1 {.., Csommurlicallors OU.mmisIG11 ASR Registration Search Results it4,llfki I UJp'Jnte.S I' F'llII1(1 lllii:iath(ls I For f i Ind Antenna Structure Registration FCC > WTB > > Onluie Systems > ASR Search ASR Registration Search Registration Search Results New Search Resultfil O Refine Search 8 Printable Page ctiDuerr 0ownkoadl Mao Matches 11-20 (of 32) r<< Previous: 1.-10]12 4 [Next: 21-30>>] Specified Search Latitude --.'40-14-40.9 N`, Longitude='104-52-29.9 W', Radius=16.1 Kilometers Display: I Basic View ti �lis''c�d 11 1214616 12 1214720 13 1216209 14 1217037 15 1224863 16 1226838 17 1227281 18 1238756 19 ).248313 20 251<. __ 0 Longmont, CO Constructed A1021904 T -Mobile West Tower LLC 40-12-20,3N 104-58-25.5W Constructed A0213699 WELD COUNTY REGIONAL DISPATCH CENTER GREELEY POLICE DEPARTMENT Constructed Constructed Constructed Constructed 40-15-40.9N 104-42-22.8W A1021921 T -Mobile West Tower LLC 40-16-16.0N 104-58-46,0W A1003571 Xcel Energy Services Inc. 40-14-40.9N 104 -S2 -29.9W A0577759 ROBERT STANLEY 40-23-06.9N PROPERTIES LLC 104-44-13.8W A0821044 SpectraSite Communications, LLC, through American Towers, LLC. Constructed A1026141 STC Five LLC Constructed A0323725 ADCOM911 Constructed A0627133 Global American Broadcasting Network, Inc. 40-09-26.6N 105-01-02.5W 40-22-32.4N 104-41-53.9W 40-06-06.7N 104-44-21.7W 40-16-51.ON 104-56-25.0W Constructed A1003563 Xcel Energy Services Inc. 40-14-40,9N 104-52-29.9W Matches 11-20 (of 32) [<.z Previous: 1-10] 1 224 [Next: 21-30>>] FCC Site Map gd ADVANCED SEARCH ® HELP Pending Application(s) 32.0 LA SALLE, CO 112,8 Mead, CO 24.7 PLATTEVILLE, 65.0 CO Greeley, CO 76.2 Longmont, CO 60.9 Evans, CO 18.9 FT, LUPTON, CO Johnstown, CO 27.4 60.7 Platteville, CO 77.0 Lu.... fl. ..:_.,I -.....'l F..n n... ill II..M1....I�...C.,.....kl...,.�....�dt.. I....']..........MT�i....—Tani Dfl/i.m..T./R nii•Dnnn-1f7 rear. Q.ann—'J 3/4/2017 ASR Registration Search Results FCC FederiI Communications Corrnisslall i :owe I f.nitiot ,(" , ; r)i Cupirr-minet : I i'lrlCi Antenna Structure Registration n WTS > fi�tR > O illne Systems > ASR Search ASR Registration Search Registration Search Results New Se_arch Os. Refine Search a Printable Pane Query Download Resultfsl .�*Mma Matches 21-30 (of 32) [<< Previous: 11-20] 1 2 3 4 Next: 31--32»] Specified Search Latitude= -'40-14-40.9 N', Longitude=104-52-29.9 W', Radius=16.1 Kilometers Display: ( Basic View r I , cn 21 1269686 22 1271265 23 1271338 24 1271775 25 1272857 26 1283790 Constructed Constructed Constructed Dismantled Dismantled Constructed A0693359 A0657712 A0727785 A0839086 A0937834 A1053911 52 Eighty, LLC Horvath Towers, LLC SBA Towers III LLC SBA Towers III LLC SBA 2012 TC Assets, LLC SBA Towers VI, LLC 27 1285529 Constructed A0863949 WELD COUNTY OF 28 1285999 Constructed A0863950 WELD COUNTY OF 29 1269342 Constructed A0988984 Verizon Wireless (VAW) LLC 30 1292584 Constructed A0921972 American Towers, LLC. Matches 21-3D (or 32) [,' < Previous: 11--20] 1 2. 3 4 (Next: 31-32>>] ASR Help ASR Online Systems About ASR 40-11-10.2N 104-49-02.8W 40-20-13.9N 104-55-27.9W 40-14-42.7N 104-59-53.6W 40-13-20,9N 104-49-47,2W 40-22-29.2N 104-58-41.3W 40-08-14,1N 104-56-11.0W 40-06-39.3N 104-46-28.0W 40-10-11.2N 104-58-27.9W 40-13-07.8N 104-48-54.0W 40-14-24.8N 105-03-23.9W I'CC Site I1eI3 oil ADVANCED SEARCH ® HELP = Pending Appiication(s) Platteville, CO Elwell, CO Mead, CO Plattecille, CO Loveland, CO Longmont, CO Fort Lupton, CO Longmont, CO Platteville, CO LONGMONT, CO ASR License 1o55ary - FAQ, - Onlfne FIeIp - Documentation - Technical Support TOWAIR- CORES - ASR Online Filing - Apollcaf_ion Search - Registration 5.carcn Privacy Statement - About ASP. - ASR Home 31.7 22.0 24.7 30.0 27.4 21.3 91.4 91.0 21.3 60.0 9 11 3/4/2017 ASR Registration Search Results F(C Federal Comrnunicat°arts - Go:rlrrlissian rf (.; t il!irir' I :;SE:,!t(I) I Lir)(I;II.C.': I {{11tlell:rveF, I POI ;_alll`..;Iii11F`e I: II ICI lh?OI)It' Antenna Structure Registration f > WTB >2152 > gnllne Systems > ASR Search ASR Registration Search Registration Search Results New Search CI, Reline Search a Print bl4 Page r Query Dawnigad Result(s) TIV `LL] Matches 31-32 (of 32.) [ c < Previous: 21-30]..2.4 Specified Search Latitude -'40-14-40.9 Nr, Longitude ----'104-52-29,9 W', Radius=16.1 Kilometers Display: Basic View v I r �o 31 1292585 32 13007370 FCC Site Mau D] ADVANCED SEARCH 0 HELP E = Pending Application(s) Constructed A0910620 American 40-14-24.8N LONGMONT, 12.5 Towers, LLC, 105-03-24.1W CO Granted A1005004 Atlas Tower 40-20-03.4N Milliken, CO 22.5 Holdings, Ll_C 104-51-28.7W Matches 31-32 (of 32) [< c Previous: 21-30] 1 2 3 4 ASR Help ASR License Glossary - FAQ - Online Help - Documentation - Technical Suarort ASR Online TOWAIR- CORES - ASR Qrillrre Filing - Aiaplication Search - ReciisLratiQre Search Systems About ASR prjyacy_State nerit - About ASR - ASR Home Registration Search By Registration Number r SUBMIT FCC I Wirniess I QL4 I CORES Help I Tech Support Federal Communications Commission 445 12th Street SW Washington, DC 2055'4 Phone: 1-877-4130-3201 TTY: 1-717-338-2824 Submit Help Request Exhibit M Tax Certificates See attached Tax Certificates for both Mewbourn Tax Parcels • #1057-35-4-00-002 (118.17 acres) —18295 WCR 35, Platteville, CO • #1057-35-4-00-008 (6.22 acres) —18455 WCR 35, Platteville, CO 317/2017 Tax Account Tax Account Summary Account Id Parcel Number Owners Address Situs Address Legal Inquiry RI599202 105735400008 DCP MIDSTREAM LP ATTN: PROPERTY TAX DEPT 5718 WESTH EIM ER RD STE 2000 HOUSTON, TX 77057-5774 18455 COUNTY ROAD 35 WELD PT SE4 35-4-66 LOT A AMD REC EXEMPT RE -591 (.53R) As Of 103/07/201 Payment Type O First O Full Taxes Due $2,676.50 Total Due $2,676.50 Value Area Id 0106 - 0106 OFFICES -LAND - 2120 OFFICES -IMPROVEMENTS -2220 WAREHOUSFJSTORAGE-IMPS. - 2235 REFINING/PETROLEUM-IMPS. - 3225 Total Value Taxes 2 Actual 124,400 26,669 41,714 2,995 195,778 Mill Levy 47,1380000 Assessed 36,080 7,730 12,100 870 56,780 $2,676.50 The amount of taxes due on this page is based on last year's property value assessment. htlps://Www.weldtax.comfireasureritreasurerwebtaccounk)sp?account= R1599202 1/1 Weld County Treasurer Account R1599202 Parcel Number Receipt node 105735400008 Apr 28,2016 PA_ NENERGY FIELD SERvICE5 INC A ITN PROPERTY TAX DEPT 5718 WEST HEIMER STE 1900 HQ11$T'ON, TX 77057-5745 Receipt Nimiber 2016 -04 -28 -batch -0 165 Nita§ Aline Payer 18455 35 CR WELD 000000000 DCP MIDSTREAM CORP Legal Dcoa iptiaa PT SE -I 35,.4.66 LOT A AMD REC EXEMPT RE -591 (.53R) Propey Coda Acted Assaaaed Year Area Mill Levy OFFICES -LAND -2124 124,400 36,080 2015 0106 39.465 OFFICE S-1MPROVEMEiv TS - 2220 26,669 7,730 2015 0106 39.465 WAREHOUSE/STORAGE-IMPS. - 2235 4O'4 ,714 12,100 2015 0106 39.465 REFINING/PETROLEJM-IIVIPS.-3225 2,995 870 2015 0106 39.465 Payments Reach/eel Direct Deposit Multi -Account Payment Bank Account 1 PapmentaApplied Year Charges Billed Prior Payments New Payments Balance 2015 Tax $2,240.84 $0.00 $2,240.84 $0.00 $2,240.84 Balaaoe Dun se of Apr 28, 2016 Thank you for your payment al i payments subject to final bank clearance $0.00 $0.00 3/7/2017 Tax Account Tax Account Summary Account td Parcel Number Owners Address Sims Address Legal Inquiry R1422602 105735400002 DCP MIDSTREAM LP ATTN; PROPERTY TAX DEPT 5718 WESTH EIM ER RD STE 2000 HOUSTON, TX 77057-5774 18295 COUNTY ROAD 35 WELD PT SE4 35-4..66 LOT B CORR REC EXEMPT RE -3203 (2.55R) As Of 03/07/2017 Payment Type 0 First Full Taxes Due $14,341,28 Total Due $14,341.28 Value Area Id 0106 - 0106 WAREHOUSE/STORAGE-IMPS. - 2235 REFINING/PETROLEUM-LAND - 3125 REFINING/PETROLEUM-IMPS. - 3225 AG -DRY FARM LAND -4127 Total Value Taxes Actual 420,189 195,920 424,619 8,382 1,049,110 Mill Levy 47.1380000 Assessed 121,850 56,820 123,140 2,430 304,240 $14,341.28 The amount of taxes due on this page is based on last year's property value assessment https:/lwww.weldtax.comPo.easurerltreasurerweblaecountisp?account= R1422602 ill eauginala ' q 1Bu9 M loo fgns sluauksd l Is luawifsdsnoh 10; nod 1IuB4,l, 00'09 9!OE `St adYJD I Ina ocuBLIa 00'0$ b8'900`ZT$ 00'0$ a0LIMB a 66'900`ZT$ 00'0$ saunwStid max sauawRsd loud b8'900`ZT$ 'MI CI -0Z fall! fl sa$1EgO ittaA MOAT %iild I #unooay slung Tutu Manno33y-uinn TisodaQ;o:gQ pR sl1d 5917'6€ 9010 SIOZ 0£b`Z Zg£`g 5917'6£ 9010 S10Z Obl`£Z1 619'17Z17ZLZfb'QI+IHiy1[uy3JLgQ JUICE -DV c917'6gut*,'6£ 9010 SI OZ 0Z8`9S OZ6`561 S£ - anrvr THns-rol 9d/D 3 T S9V'6C 9010 Sint 0S8`IZT RI 'UV S£ZZ-'ScInf-aDY11O,LS/aS11OHH2ldM 'I'L'L Hwi guy 710.t p4° V' INVY opat} dpodard (ZicS'Z) EKE -a a LdrH Daa 2R1OD ft .1.01 99-6-S£ Vas Id izogdriosoa Pen �QO JAIVRILLSCELN dOa 000000000 Q'Ii &)1O S£ $6Z8I Jam =UM' IMO 1 LLS-LcoLL Li.'A10,LSi1Q l 000Z 71S Gli 3lflismH.LSfM 8ILS Id KI XV,LA.1,X:44Olld 3LLLV d I YNPda7LLSQLIJi d 5910-4mBq-8Z-b0-9lOZ 910Z`8Z1dy Z0000pc£LS0I JeqtunpI oleQ ;Awn a°q w M palm aalnseau I[}uno3 pram Z09ZZb13[ mow DCP Operating Company, LP Drainage Report Mewboum3 Gas Plant March 1, 2017 CERTIFICATION OF COMPLIANCE ENGINEERING DESIGNED TO WELD COUNTY CODE AND STANDARDS I, Rodney D. Burrows, PE, Consultant Engineer for DCP Operating Contoanv, LP, ("Applicant"), understand and acknowledge that Applicant is seeking land use approval of 5MJUSR17-83-542 ("Application") for the property described in the attached Exhibit "L." I have designed or reviewed the design ("Design") for the proposed land use- set forth in the Application. I hereby certify, on behalf of Applicant that the Design will meet all applicable requirements of the Weld County Code with the exception of variances(s) described below. This certification is not a guarantee or warranty either expressed or implied. Engineer of Record Signature DCP Mewbourn 3 Drainage Report — 5MJUSR97-83-542 1. General Overview The original Mewbourn Gas Plant was constructed on the east side of a 120 -acre (approximately) parcel adjacent to Weld County Roads 35 and 38. This area is within a Non -Urbanizing Drainage Area. The plant was built on an existing slope running south -to -north, with drainage from the site flowing downhill to the northwest. The original plant was constructed by a previous gas producer in the late 1980's. That facility was approximately eight acres in extent and still exists on the northern end of the current plant. It was named Mewbourn1 on some of the maps prepared for previous USR submittal packages. In 2009, DCP expanded the plant with the Mewbourn2 project, which included approximately 25.9 additional acres within the USR boundary for the expansion. The Mewbourn2 Gas Plant was the basis for the Final Drainage Report prepared by Eric Reigel, PE, in 2008. It was built immediately south of the Mewbourn1 Gas Plant, fronting WCR 35, and also drains to the northwest. Since both portions of the plant are now fully integrated, DCP and Weld County now refer to the overall existing facility as the Mewbourn Gas Plant. Except for two very small portions of land in the northeast and northwest corners of Mewbournl, all areas within Mewbournl and Mewbourn2 drain to the west into a Water Quality Feature (VVQF), and then northwest from the outlet of the WQF. The two exceptions are small areas in the north of the Mewboum1 Plant that drain to small water quality control features contained by an existing concrete retaining wall along the north fence lines. Those two existing features also eventually drain to the north, and into the irrigation ditch on the north edge of the parcel. The existing main water quality feature was designed to capture 100% of the runoff generated from a 100- year/24-hour storm. Although this requires a volume approximately 10 times that required by the Weld County Code at the time of construction, DCP voluntarily oversized the ponds to serve as containment features in the unlikely event of a spill or contaminant discharge from the plant. The existing water quality pond will be enlarged and is currently equipped with a manually operated valve that allows a technician to check the pond for any contaminant sheen after a storm, and then release the detained stormwater if no evidence of accidental contamination is observed. Stormwater is released over a period of three days at a rate below that of historic runoff from a 10-year/1-hour storm. Similarly, the two smaller WQC features at the northeast and northwest corners of the site are equipped with manual release valves designed to contain stormwater for inspection by a technician prior to release. Each of the two minor WQC features collect runoff from approximately 1 acre of the plant site, and are unaffected by this expansion project. 2. Description/Scope of Work and Proposed Mewbourn3 Gas Plant The proposed equipment installation will be a new gas plant to be constructed to the west of the existing Mewbourn2 Gas Plant and will be comprised of about 60 acres of natural gas processing, treatment and compression facilities. No major modifications to the existing site drainage or topography are needed as part of this expansion project, although portions of the south half of the gas plant will be lowered several feet, and the north half will be raised several feet to construct a relatively flat pad for the development of the plant. Stormwater runoff will continue to flow generally north, and all of the runoff from the Mewboum3 Gas Plant will be collected in the existing Water Quality Feature that was constructed for the earlier Mewbourn2 Gas Plant. 3. Runoff Calculations The original project plans sized the main water quality control feature at approximately 237,235 cubic feet. The original design for the pond was based on temporarily capturing runoff from about 31.68 acres of graveled site pad, including about 80,000 square feet of roofed area. The proposed Mewbourn3 Gas Plant adds about 27.4 acres of existing farmland to the existing plant by converting the farmland into less permeable gravel areas and roofed buildings. This expansion approximately doubles the total graveled and covered area to 61.1 acres (including Mewboum1, 2 and 3 Gas Plants). Based on the assumption from the original report that the imperviousness of the gravel is about 50% and that of roofed areas is about 95%, this plant addition approximately doubles the storm runoff to the WQF pond. Since Weld County Code requirements have increased since the original construction, the WQF will need to be enlarged to handle the increased stormwater flow created by the new plant. 4. Requirements of Original Mewboum2 Gas Plant Grading Report and Permit In the approval process for the original grading permit, the Engineer -of -Record (which was the undersigned for the final design and construction of the grading) was required to certify that the project was built according to the approved plans and permit. It was indeed built to those plans and permit, and I certified that compliance at the conclusion of the project. DCP also had to agree as a part of the USR approval that the water quality control feature would be designated as a "no build/no storage area". It was, and no storage, construction or modification has occurred in this area since construction was completed. Furthermore, the pond is designated to remain as a "no build/no storage" area and no modification to this feature is proposed or necessary for the construction of the new Mewbourn3 Gas Plant, other than enlargement of the pond to handle increased flows. 5. Summary of Proposed Improvements for Mewbourn3 Gas Plant The original -water -quality -control -feature -that collects stormwater runoff from the Mewbourn2 Gas Plant was deliberately overdesigned in 2008 to allow DCP to temporarily collect 100% of the runoff from a 100- year/24-hour rainstorm. The additional facilities proposed in this project will approximately double the amount of stormwater runoff to the pond, which will be addressed by raising the spillway and dam elevation about 16" and increasing the size of the existing pond on the south end. The Mewbourn3 Gas Plant site is located on a relatively flat site draining generally to the north with an average grade of about 2 percent, towards the existing Mewbourn2 WQF pond. The pond outflow drains north and eventually into an irrigation ditch and then to the east. The project site is currently undeveloped agricultural cropland. The proposed project is a fenced natural gas compressor facility consisting of about 62.08 acres, located in the southern portion of the overall -120-acre parcel. The remainder of the site outside of the three gas plants will not be developed. Except for a —40 acre temporary staging/laydown yard for the contractor, which will be graveled, the remainder of the site will remain as rangeland. 6. Methodology used for drainage report and analysis: Rational Method Design parameters: Design Storm: 100-yr/1-hr = 2.70" for this site per NOAA weather atlas Release Rate: 10-yr/1 hr = 1.41" for this site per NOAA weather atlas Urbanizing or Non -urbanizing: This is a non -urbanizing area Overall post -construction site imperviousness: 80% (within the fenced and graveled areas) Soils Types: Loamy sand and fine sandy loam 7. Current Off -site to On -site Drainage: No significant runoff enters the site from off -site. Such conditions will not change as a result of this project. The south end of the parcel along WCR 35 is elevated and serves as a natural ridge that prevents water from the south from entering onto the property, except for minor amounts of runoff from some portions of the adjacent county roads. Virtually all off -site drainage is currently routed around the site along County Road borrow ditches. That will remain unchanged. 8. Current On -site Drainage: Within the proposed Mewbourn3 Gas Plant area, stormwater runoff generally runs north via surface flow to the existing Mewbourn2 Water Quality Feature (WQF) on the northern portion of the parcel. As described above, the existing pond will be enlarged to handle the increased flows of this project. Stormwater on -site flows will be intercepted and temporarily held in the Mewbourn2 WQF (Water Quality Feature) pond. (Stormwater will be manually released within 72 hours of capture.) 9. Current On -site to Off -site Drainage: Runoff from the location of the proposed gas facility flows off - site into an existing irrigation ditch in the north portion of the parcel. From there, stormwater flows with the ditch and is used for irrigation by downstream ditch association members. These general drainage patterns will remain unchanged in this project, except that a portion of these stormwater flows will be intercepted and temporarily detained in a WQF pond. The stormwater released from the enlarged WQF will be released at a rate over three days not to exceed the 1 hr/10-yr storm rate of the pre -developed property. 10. Proposed On -site Drainage: In the proposed site development, the Mewbourn3 plant site will be graded generally flat, with a slight slope to the northeast towards the existing WQF pond. Runoff will be collected in shallow swales on the sides of the process area and those swales will drain to the new WQF. Swales will be located around the periphery of the plant in such a way as to collect runoff from all process areas associated with the facility. 11. Drainage Calculations: In accordance with the Weld County Code, the Water Quality Feature will continue to act as a temporary_ detention pond, and will be sized to collect 100% of the runoff from a 100-year/1-hour storm for the combined runoff of Mewbourn2, Mewbourn3 and almost all of Mewbournl. Per the NOAA on-line weather atlas, the 100-year/1-hour storm is 2.70" of rain, and the developed portion of the site is 61.1 acres (59.08 acres of which will drain into the enlarged Water Quality Feature). Required volume of WQF pond: (assuming 590/u runoff coefficient) Vreq = 59.08 acres * 43,560 sqft/acre * 2.70 inches /12 in/ft * 0.59 = 341,635 cft Vactua1 = 237,235 cft (existing pond) + 104,400 cft (increased volume from excavation & raising spillway) = 341,635 cft Required maximum release rate of pond: Per Weld County Code, for non -urbanizing areas, release rate cannot exceed the historic 10-year/1-hour release rate assuming 2% runoff coefficient. Release rate max = 1.41" x 2% * area = 1.41" x 0.02 * 59.08 acres * 43,560 sqft /12in/ft = 6048 cft/hr maximum = 100.8 cfm = 1.68 cfs At that rate, the pond will be emptied in 341,635 cft/6048 cft/hr = 56,5 hours (OK) The water released from the spillway will travel at low velocity as sheet flow across a flat area of about 30 acres northwest of the darn, where a portion of the flow will infiltrate into existing farmland. Excess runoff will continue offsite in accordance with historical patterns, and will flow into the Platte Valley Irrigation ditch. Miscellaneous culverts will be installed around the proposed site where needed for pedestrian and vehicular traffic during rainstorms. None of the installed culverts will be for public use, and are used only for roads internal to the plant with low -speed on -site traffic. Erosion control best practices will be employed prior to construction in compliance with stamped engineered drawings, Weld County Grading Permit and compliance with the State of Colorado Stormwater Management Permit. Post -construction, permanent erosion control measures will be finalized, and the areas outside of the perimeter fence will be reseeded with native seed mixes compliant with the recommended Weld County seed mix. 12. Inspection and Maintenance Plan: The DCP Project Manager will ensure that all storm water management controls are constructed or applied in accordance with governing specifications or good engineering practices. Experienced teams will be used for construction. A first inspection will occur upon installation of the controls. In addition, all workers on the site will be trained as to the location and use of the controls, especially those controls that will be disturbed as construction proceeds across the site. All training records will be maintained at the DCP Weld County office in Greeley, CO. The goal is to minimize the potential for inadvertent removal or disturbance of BMPs and to prevent the offsite transport of sediment and other pollutants. 12.1 Inspection schedule Minimum Inspection Schedule. The minimum inspection schedule applies to those sites under active construction, and includes the period from when the ground is initially disturbed to when construction activity is completed, and also includes the preparation of areas that will be revegetated for interim reclamation. During the Active Site period, a thorough inspection of the site storm water management system (which includes all utilized BMPs) must be conducted at least every 14 calendar days. Also, post - storm event inspections must be conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. There are three exceptions to the minimum inspection schedule: post -storm event inspections at temporarily idle sites, inspections at completed sites, and inspections during certain winter conditions. Any use of an exception is temporary, and does not eliminate the requirement to perform routine maintenance due to the effects of a storm event or other conditions that may impact Best Management Practices (BMP) performance, including maintaining vehicle tracking controls and removing sediment from impervious areas. Inspections, as described above, are required at all other times. Post -Storm Event Inspections at Temporarily Idle Sites. Temporarily idle sites are those where there are no construction activities occurring following a storm event. At such sites, post -storm event inspections must be conducted prior to restarting construction activities at the site, but no later than 72 hours following the storm event, and the delay must be noted in the inspection report. Routine inspections still must be conducted at least every 14 calendar days. Completed Sites. Once construction is completed and the site has been prepared for final stabilization (including completion of appropriate soil preparation, amendments and stabilization practices), the site (or portion of the site) is considered a Completed Site (for purposes of the State storm water permit). Note: Only construction activities that result in a disturbance of the ground surface must be completed. Construction activities that can be conducted without disturbance of the ground surface, such as certain well completion activities, would not prohibit a site from otherwise qualifying as a Completed Site. (Completed Sites still require permit coverage until the final stabilization criteria have been met.) Completed Sites qualify for a reduced inspection schedule, as the potential for pollution is reduced if the site has been adequately prepared and/or seeded. However, because slopes and other disturbed areas are not vegetated, erosion in these areas still occurs which requires maintenance activities such as regrading and seeding of problem areas. As such, inspections must continue in order to address these situations. During the Completed Site period, a thorough inspection of the site storm water management system (which includes all utilized BMPs) is required at least once every month. The Stormwater Management Plan (SWMP) must be amended to indicate those areas that will be inspected at this reduced frequency. Winter Conditions Inspections Exclusion. Inspections are not required at sites where construction activities are temporarily halted, snow cover exists over the entire site for an extended period, and melting conditions posing a risk of soil erosion do not exist. This temporary exclusion 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. Inspection records must document the following information when this exclusion is used: dates when snow cover occurred, date when construction activities ceased, and date when melting conditions began. Once final stabilization has occurred, inspections will no longer be necessary. 12.2 Inspection procedures Inspections will be conducted by qualified personnel on the following areas: • All BMP measures identified • All vegetated areas until 70% of pre -disturbance vegetation levels are reached • Construction site perimeter and discharge points • All disturbed areas • Locations where vehicles enter or exit the site • Areas used for storage of materials/wastes that are exposed to precipitation • Other areas determined to have a significant potential for storm water pollution These areas will be inspected to determine if there is evidence of, or the potential for, pollutants leaving the construction site boundaries, entering the storm water drainage system, or discharging to state waters. All BMPs will be evaluated to determine if they still meet the design and operational criteria in the SWMP State Permit and if they continue to adequately control pollutants at the site. Any BMPs not operating in accordance with the SWMP will be addressed as soon as possible, immediately in most cases, to minimize the discharge of pollutants. If modifications to the SWMP are deemed necessary, the SWMP will be revised as soon as practical, but in no case more than 72 hours after the change(s) in BMP installation and/or implementation occurs at the site. 12.3 BMP maintenance and replacement of failed BMPs Maintenance activities will ensure that all control measures are functioning at optimum levels and that all procedures and techniques will be in proper working order during a runoff event or spill condition. Any maintenance, repairs, or replacements deemed necessary after required inspections will be corrected as soon as possible (if not immediately), to minimize the discharge of pollutants. All maintenance activities will be noted on the inspection and maintenance report form, as discussed in the next section. Maintenance will include, but is not limited to: • Pickup or otherwise prevention of litter, construction debris, and construction chemicals from becoming a pollutant source prior to anticipated storm events • Removal of sediment from silt fences, sediment traps, spillway, and other sediment controls • Reseeding of any bare spots where vegetation has failed to establish • Repairs and/or adjustments to any erosion and sediment control that is deteriorating or found to be performing inadequately • Installation of additional erosion and sediment controls if needed to adequately manage the pollutant sources at the site Detailed maintenance requirements for each BMP are identified in the Stormwater Management Plan. 12.4 Recordkeeping and inspection documentation The permittee must document inspection results, and maintain a record of the results for a period of 3 years following expiration or inactivation of permit coverage. A typical inspection and maintenance report form is included in the Stormwater Management Plan. Inspection reports will include the following: • Date of inspection, name of inspector, and title of inspector • Reason for the inspection (active, completed, post -storm event, etc.) and areas inspected (site name and portion(s) of the site inspected) • Vegetation observations, if necessary, including the percent pre -disturbance vegetation and whether or not vegetation growth has reached 70% of pre -disturbance levels • Erosion and sediment control observations including any required actions and dates performed • Other site observations including any required actions and dates performed • Additional comments such as: - Location(s) of discharges of sediment or other pollutants from the site - Location(s) of BMPs that need to be maintained - Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location Location(s) where additional BMPs are needed that were not in place at the time of inspection - Measure(s) taken to prevent future violations - Changes necessary to the SWMP and date performed After adequate measures to correct any problems have been taken and recorded, or where a report does not identify any incidents of non-compliance, the report will contain a signed certification indicating the site is in compliance with the permit to the best of the signer's knowledge and belief. In addition to the above inspection report, all spills, leaks, or overflows will be recorded and tracked in the DCP Asset Management System (AMS). 13. Drainage Report Summary: The design of the enlarged detention pond will be based on collecting 100% of the runoff predicted from a 100 -year, 1 -hour duration storm. After the rain from a large storm subsides, a plant operator will check the water in the pond for any sheen indicative of hydrocarbon contamination. If any contamination is found, the contaminated water will be removed by DCP and hauled to a refinery. Non -contaminated water will be released via a normally closed manual valve to flow off -site in a controlled manner. The rate of water discharge is limited so as to not exceed the historic stormwater flow from the site. Water will not be held on the site for longer than 72 hours after capture in a rainstorm. The historical flow patterns and run-off amounts will be maintained in such a manner that it will reasonably preserve the natural character of the area and prevent property damage of the type generally attributed to run-off rate and velocity increases, diversions, concentration and/or unplanned ponding of storm run-off for the 100 -year storm. There are no significant stormwater-related project impacts to off -site property that need to be mitigated. Figure 1 Site Vicinity Map P !;1; k'. i�; III r �91H STy -,� 11 G-0Irl,Y " �iilr.. ''i r ff : • heap - - ....� 1]ie6,►ayttw 1 3U 1iWr6••, f• ��.} }, 1,Xr�e., i y71 li...-a• l.. $3 i ' c �i�il ` h - I i.Y,`�arH:sT� `�' `l�°�'al'• • tM ils y �� rA ": :f oil" _ I ' I! Lill L: —! E 151iT. - Ei•'• :• i�z !s � IJul�i161lE�, � r�h1.� --[__r-8 � �-:,-: '_' � i Ir r • r„r11 1_-_ , M@1,511 ..4, lfl lin' ' s I i �iH �r I 84 r.�l ' MfR10111 S71 `f-- rr - I^� r1 � le -`r HSr L�i�li II"� 1�r: �. -� �t i- 7,•' rs I 2f15fja?�l Ji jKi�',I i• llll' i ' H 1i:i1'dE1!I'I. v II, r:�i�l^} • '}� '}• t` 1II i _ �2�sIl! -1- r <- I CG } f :r•.- 41 . �.r. 4. O. • -h I,Gi ,•r r-.. �,: s: , r rr '� �i# ii,'''i` '-;Ir-Arden ity'-t ! �Eus '.. • Ml3lrHS1 Elm[ _' 4N 5F II 4 ,I I 1,Lif1r, l - x r - r _i' L• 1 UP ,.. '41.' •4ir,, J @56) r ,, Pecbhair ..-- I; r ' 1 -IL .41 1 4 lL 347e., grit,' .l 1 '•i CR SA `r( rr'II ip; 4Tho _ s, .,,. .J ,, hE,vans 4 EI }llr C• i9Tl{ SI ��rl �7 — -- a 1- ' .'*East .a Salle .'.4 • I l:R 5D t (:•:7••: ell ae --r. *H• mbirt II CR42 ii rr . I :- i 110 j , r: ,... I j 'AM � �I CAI CR I Figure 2 Site Topographic Map 1 SITE Figure 3 Site Soil Map Soils at the site are predominantly classified as the following soil types: Soil Type Description Percent of Mewbourn3 Gas Plant Area 70 Valent sand, 3-9% slopes 80% 72 Vona loamy sand 0-3% slopes 10% 48 Olney fine sand 10% 15 11 18 70 23 2+ 2X YB Ti i TIP. ROADWAY HS 30 bl 32 SEE GRADING PLANS FOR LOCATIONS AND PROFILES OF BORROW DITCHES. 12 COOT CLASS 6 AGGREGATE BASE COURSE COMPACTED TO 88% ASTM D-898 YA)L NOTE: SUBGRADE SOILS SHALL BE PREPARED BY SCARIFYING TO 6' MIN. DEPTH AND ROLLER COMPACTING TO 98% ASTM 0-896 DENSITY. COMPACT IN 8' MAXIMUM UFTS WITH MOISTURE CONTENT WITHIN f3% DF OPTIMUM. TYPICAL ENTRY ROAD SECTION 15' C' 8EE PLAN & PROFILE DVIGS FCR TDP Cf GRADE ELEVATIONS TYPI AL MAIN ACCESS ROAR CROSS-SFC71fN INTERIOR ROADS ARE SIMILAR MWIAF1 BDOX CEOTDITW-E S:E GRADING PLANS FOR LOCATIONS AND PROFILES Cf BORROW DITCHES. 16' 15' 0' 12' COOT CLASS 6 AGGREGATE BASE COURSE COMPACTED TO 98% ASTAI D-698 4% MAX NOTE; SUS GRADE SOILS SHALL 8E PREPARED BY SCARIFYING TG 6' MIN. DEPTH AND ROLLER COMPACTING TO 98% ASTM 0-898 DENSITY. COMPACT IN B' MAXIMUM LJFTS WITH MOISTURE CONTENT WITHIN f3% CF OPTIMUM. TYPICAL INTERIOR ROAD SECTION FLOW RIC♦. COCONUT Cfl EXCELSIOR FIBER ROLL (WATTLE) 8' DIA. (MIN) SECTION STAGGER JCIW S �p FLOW P:,ACE WATTLES PERPENDICULAR TO SLOPE CONTOURS. PROFILE PLAN VIEW 1-,,2" Mill. 'HOOD STAKE 68" MAIL SPACNC STAKING SPACING 4' D.C. 1. USE 1'I 2' MIN W000 STAKES. 2. INSTALL ADDITIONAL STAKES ON DOWNHILL SIDE OF WATTLES, ON STEEP SLOPES OR HIGHLY EROSIVE SOILS. (w)WATTLE DETAIL NOT 10 SCALE ROAD 15' 0' SEE PLAN k PROF1IF OTVGS FOR TOP OF GRADE ELEVATIONS 4% AlL) 'NEAR BOOM GEGTECKE TYPICAL INTERIOR Ri fl p55--SECT10y (F01 I OYANC 'V STAI LOTION_ fSF_CFO.TFXTI.I_I) I. SET POSTS AND EXCAVATE A 6'X8' TRENCH VP SLOPE ALONG THE UNE OF POSTS i I. LOPE 2. STAPLE WIRE FENCING TO THE POSTS. 3. ATTACH THE FILTER FABRIC TD THE WIRE FENCE AND EXTEND IT INTO THE TRENCH. 4. BICKFILL AND COMPACT THE EXCAVATED SOIL SILT FENCE FrFNCE POST O FABRIC 3'-O' WIDE — SILT --ti &' W106 X 8' DEEP TRENCH, BURY DOTTOIJ 12' OF FADRIC AND TAMP IN PLACE. LETTINC GRADE ELv SEE AN {I'IP.) NOT 1D SGVE F E EXTENSION OF FABRIC AND WIRE INTO THE TRENCH 311.7 ER FABRIC MUM 4 5 S 7 10 12 WIRE NOT TO SCALE OVERLAP ALL BE.VMS A MINIMUM OF 12 BARRIER REQUIRED 0 TDE OF SLOPE 1. MAINTAIN wATER11GRT COVERING IN PLACE BY USING SWDOACS OR TIRES ON ROPES WITH A MAXIMUM GRID SPACING OF 10' IN ALL DIRE0110525, 2. OVF.RiAP ALL, SEAMS 511TH MINIM4n! 12' OWRLAP- 3. INSTAL€ BARRIER a Tot. OF STOCKPGE TC PRESENT WATER FROM FLCMING IV CR out 07 5700 PILE. 4. USE SOIL IN SITE GRADING OR (IF 1UPSOILI SI' WA I I' AROJHD .ARE/ CO BE RESTORE() PRIOR TO COIIPLEIIHC W77RN ON NE PROJECT. TEMPORARY SOIL STOCKPILE (SSt9 PROTECTION 12' ANN SWALE 5Cana; NO. _ ELEVATIONS LENGTH WIDTH PT1&3 PT2&4 PF5 PT6 2 4 5 a B 10 S' MIN. 2% SLOPE A 8"x8. M�N .._.. �.._ jCTICN A C}YiLNSTALS.AI10N NO IES 1. SEE GESC DWG FOR CWA INSTALLATION LOCATION. 2. DO NOT LOCATE AN UNUNED CWA WITHIN 400' OF ANY NATURAL DRAINAGE PA7FJWAY DR WAITRCOPY, DO NOT LOCATE WIll'N 1.200' OF ART WELL OR ORJN11110 »'A 1ER EOu11LF. IF STE CIINDIRAINTS MOLE THIS INFEASB1.f, '7-41 IF HI4ILY PERmEASLE SOILS Ek15T ON SITE. IN575L1_ THE CNA WITH AN IMPFSIMEARLE EWES 4'S MIL MIN, DICK NESS) OR 415E SURFAR STORAGE ALlENNA RYES 175550 PrlEFAIIV&J5TLD CONCRETE WAS -117U7 UEYL DR A UN13. ABOVEGROUND STORAGE BASIN. 3. INSTALL THE CWA PRIOR TO CONCRETE PLACEMENT ON -BITE. 4. CONSTRUCT 1111. CWA 10 INCLUDE A FLAT SUBSURFACE PIT THAT IS AT LEAST 8' BY 8'- MAKE SLOPES LEADING OUT OF THE PIT AT 3:1 OR FLATTER. MARE THE PIT AT LEAST 3' DEEP. S. CONSTRUCT BERM SURROUNDING SIDES AND BACK OF THE CWA AT A MINIMUM HEIGHT OF 1'. 6. SLOPE VEHICLE TRACKING PAD AT 2% TOWARDS THE CWA. 7. PLACE SONS AT THIS C NSTR0CITC1y ENTRANCE, A1' DIE GWA AND LLSEYrt*ERE AS NECESSARY TO CLEARLY INDICATE RFE LOC3-116N Cf THE TWA TO IYLRA1CND OF C:ANCi110 TRVCICS AND POMP R;GE. 6. USE EXCAVATED MATERIAL FOR PERIMETER BERM CONSTRUCTION. CONCRETE WASHOUT AREA 13 14 15 16 17 18 p 20 NOT TYP. SWALE PLAN B' CONC. SLAB REJNF, W/5 0 10' EW. TYP. SWALE SECTION A 24'0 CONCRETE CULVERT W/I8' COVER WIN. 20'i20' PAD OF 6'M (AVERACE) RIP RAP 10A WHCLE TRACX,IN0 PAD 12' MIN. DEPTH 10-A10' PA0 OF 8'-8' RIPA AP EATTI ENI7 4F COLVER 1. LOCATE CONSTRUCTION ENTRANCE AS SHOWN ON GRADING PLAN. 2. SMOOTHLY TRANSITION ENTRANCE INTO EXISTING COUNTY ROAD. 3. MAINTAINs THE F�NIRANCF IN A CONDI IION WHICH VALL PREYENI TRACKING OR FLOWING OF SEO112ENT ONTO P'UIILIC RIGIi T -OF" -WAY. THIS MAT REOIiIRE PERIODIC TOP ORES0.4 4,511 AEDITrONAL STONE AS CONDITIONS DEN AND AIID REPAIR ANf7/CR CLEAR -OJT UT ANY MEASURES USE'() TO TRAP SEDIMENT - IMMEDIATELY RCMOYE ALL SEOIMENT s➢ILLED, CROPPED, WASHER OR OSAGKED ONTO I'LBLIC RICTI1--7x. --WAY. 4. PROVIDE PERIODIC INSPECTION AND NEEDED MAINTENANCE AFTER EACH RAIN. 5. DO NOT ALLOW SEO'NENT-LADEN RUNOFF TO EXIT THE SITE VIA THE CONSTRUCTION OR PEGMAN€N1 ENTRANCES. VEHICLE TRACKING CONTROL RIPRAP TYPE DRAh f ONLY MOE MI- AMI WONT RI' CE MW6EyENT CF CNWE - . . _ y� pp l77 M am_ -I WELD COUNTY, COLORADO MEWBOURN III GRADING, EROSION & SEDIMENT { CONTROL DETAIIS DRAFTED BY: FIDE CHECKED El: CAW 3E/ DATE: 1/18 SCALE: AS NOTED I A 1g/07h6 RD8 000AL TEE FOR REM/ CAW APPROVAL BY: POP DATE. l SCALE 1 N0. DATE Br P15OV APP'S DWG NO. DCP-MEW-GESC-012 ISAUE IS5UOE i f , 21 23 24 25 26 P'F 06 25 So 31 32 33 PLOT DATE:AA14aoNCAD FILENAME:s rw - -b- - A0AIN From: Christina White [mailto:casimoninc@gmail.com] Sent: Thursday, March 09, 2017 12:07 PM To: Kim Ogle <kogle@co.weld.co.us> Subject: DCP Mewbourn 5MJUSR17-83-542 clarification to Environmental Health Question Kim:. I received a call this morning from Ben Frissell and he asked me to document the conversation I had with him that clarified a few questions he had about the existing septic system at the DCP Mewbourn gas plant (no more than 3-5 employees are at the site at any given time so the use of the current septic system is adequate as Ben agreed. I have added my comments that I explained to Ben below in RED: 1. List the number of full time and/or part time employees proposed to work at this site. The construction crew required to build the expansion and install the new equipment at the existing Mewbourn gas plant will consist of approximately 50-75 people (6-9 months). After the expansion and additional equipment is installed, the existing 10 DCP employees will continue to be employed at the plant full time (there will never be 10 employees on site at the same time - 2 operators are working at separate times during a 24 -hour shift (and 1 supervisor during the day 7-4 am) then the afternoon shift has 2 operators working 4 -midnight, 2 operators then work from midnight to 7 am. This includes operations and maintenance staff that currently service the existing Mewbourn Gas Plant. 2. If shift work is proposed include the number of employees per shift. No shift work is proposed - REVISED TO: there will never be 10 employees on site at the same time - 2 operators are working at separate times during a 24 -hour shill (and I supervisor during the day 7-4 am), then the afternoon shift has 2 operators working 4 -midnight. 2 operators then work from midnight to 7 am. Ben said he would approve the LSR application on behalf of Environmental Health now that 1 answered his questions today (1 will write this more clearly for future gas plant LSR applications regarding the shift work so it is clear that only 3 employees are on the site once). .thanks and regards. Christina White White Engineering Inc. 5.03-819-1222 Hello