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Home My WebLink About20251517.tiffUse by Special Review (USR) Application Pla.nninq Department Use: Date Received: Amount .... Case # Assigned: Application Received By: Planner Assigned: Parcel subdivision in progress, recored Warranty Deed is forthcoming and will be provided at a Property Information later date along with the new parcel number, Project site €s new Parcel B. See Exhibit A (attached)k is the property currently in violation? No 1 Yes Violation Casa Number: N1A Parcel Number: o 8 o 3 _0 2 _ 0 _ o o _ o S 6 Site Address: 35695 Co Rd 47, Eaton, CO 80615 - Legal Description: _Lot.B of RE -1142 & the south half of the NE1/4 of Section 2, Township 6N, Range 65W of the eth P.M. Section:: , Township 6 N, Range 65 VV Zoning District. Agricultural. Acreage: 45.16 ac Within subdivision or townsita? ® No El Yes Name: NSA VVater (welt permit or water district tap #) : IA Bottled Water Services Proposed Sewer pn-site wastewater treatment system permit # or sewer account #): NiA Portable Lavatories Proposed Roodplain No / Yes Geological Hazard No l O Yes Airport Overlay ig No / El 'des Project A Site Specific Development Plan and Use by Special Review Permits for Oil and Gas Support and Service (Material Storage Yard, specifically for recycled road base, riprap, LI R Use being applied for: etc)outside of subdivisions and historic to nsites in the A (Agricultural) Zone District. Name of proposed business: Chevron North America Exploration and Production Company New Development Storage Facility Property Owner(s) (Attach additional sheets if necessary.) Name: Brian DeRose Company: Noble Energy Inc,, a.k.a. Chevron U.A.A. 'no, Rockies Business Unit Phone #: 970-342-0135 Street Address: 4000 Burlington Ave City/State/Zip code: Evans, CO 80260 Email. rian.aeRose@Chevron.com APPLICANT/AUTHORIZED AGENT (Authorization Porn must be included if there is an Authorized Agent) Name: AmY Conway company: Tetra Tech, Inc. phone #: 720-864-4515 Street Address: 351 Coffman Street, Suite Zoo Email: amy.conway@tetratech.com City/State/Zip Code: Longmont, CO 80501 I ONe) hereby depose and state under penalties of perjury that all statements, proposals, andior plans submitted with or contained within the application are true and correct to the best of my (our) knowledge. All fee owners of the property must sign this application, or if an Authorized Agent signs, an Authorization Form signed by all fee owners must be included with the application. If the fee owner is a corporation, evidence must be included indicating the signatory has the thority to sign for the corporation. Signature Brian DeRose Print Army Conway E It��11y slyred by Amy Conway Dale: 2024.11.1211:17:23 -07130' Date Signature Array Conway Print E FIIBIT A A PARCEL OF LAND LYING IN THE NORTHEAST QUARTER OF SECTION 2, TOWNSHIP 6 NORTH, RANGE 65 WEST OF THE 6TH PRINCIPAL MERIDIAN, COUNTY OF WELD STATE O F 1 COLORADO, BEING A PORTION OF THAT TRACT OF LAND DESCRIBED UNDER RECEPTION NUMBER 4777590, SORE PARTICULARLY DESCRIBED Ox GELD COUNTY RECORDS, AS FOLLOWS; PARCEL B COMMENCING AT THE NORTHEAST CORNER OF SAID SECTION 2AS r O Fri U M E i YTE D BY A FOUND 3-114rr ALUMINUM CAP STAMPED "LS 4392," WHENCE THE EAST QUARTER CORN �VIOiVI��i ENTED BY A FOUND 3-1ER OF SAID SECTION �, AS Orr ALUMINUM CAP STAMPED "PLS 38149", BEARS SOUTH 00°16'24" " EAST A DISTANCE OF 2,609;x.4 FEET, BEING THE BASIS O �.� �4 F BEARINGS IN THIS DESCRIPTION. THENCE SOUTH 00'16'24" EAST, ALONG THE EAST LINE OF SAID NORTHEAST QUARTER, A DISTANCE OF 1,315,50 FEET, THENCE DEPARTING SAID EAST LINE, NORTH 89°44'35" WEST, A DISTANCE POINT OF BEGINNING OF 1,111,22 FEET, TO THE THENCE SOUTH 00'00101" EAST, A DISTANCE OF 42,83 FEET TO THE N MEMORANDUM OF LEAS NORTHERLY LINE OF THAT E RECORDED UNDER RECEPTION NUMBER 4300281, ON FILE IN THE ICE COUNTY CLERK AND RECORDS OFFICE; LD THENCE ALONG SAID LEASE THE FOLLOWING FOUR COURSES: SOUTH 00°00101" EAST, A DISTANCE OF 141.00 FEET; SOUTH 89°59'59" VILEST, A DISTANCE OF 539.00 FEET; SOUTH 00'00'01" EAST, A DISTANCE OF 821.00 FEET; NORTH 89'59159" EAST, A DISTANCE OF 832.00 FEET; THENCE DEPARTING SAID LEASE, SOUTH 90'00'00" EAST, A DISTANCE OF 82 2.97 FEET, TO A POINT ON SAID EAST LINE; THENCE SOUTH 00°16f24" EAST, ALONG SAID EAST LIFE, A DISTANCE OF 93,?9 FEET, TO SAID EAST QUARTER CORNER; THENCE NORTH 89'40100" LEST, ALONG THE SOUTH LINE OF SAID NORTH OF 2,062,26 FEET, TO THE CENTE EAST QUARTER, A DISTANCE R QUARTER CORNER OF SAID SECTION 2, AS MONUMENTED BY FOUND 3-1/4" ALUMINUM M CAP STAMPED "LS 4392"} Ascent Geomatics - 8620 Wolff Court Westminster, CO 80031 www.ascentgeornatics.com Page 1 of 3 THENCE NORTH 0B°16'00" WEST, ALONG THE WEST LINE OF SAID NORTHEAST QUARTER A DISTANCE OF 1,397.81 FEET, TO THE SOUTHWEST CORNER OF LOT A OF RECORDED EXEMPTION NO. 0803-02-1- RE1142, AS DESCRIBED IN THAT DOCUMENT RECORDED UNDER RECEPTION NUIVIBER 2169382,ON FILE IN THE WELD COUNTY CLERK AND RECORDERS OFFICE; THENCE DEPARTING SAID WEST LINE, SOUTH 88°48'18" EAST, ALONG THE SOUTH LIFE OF SAID LOT A A a DISTANCE OF 400.00 FEET, TO THE SOUTHEAST CORNER OF SAID LOT A; THENCE DEPARTING SAID SOUTH LINE, SOUTH 88°48'18" EAST, A DISTANCE OF 455.85 FEET; THENCE SOUTH 00°00100 EAST, A DISTANCE OF 93.54 FEET; THENCE SOUTH 89°44`35" EAST, A DISTANCE OF 685.69 FEET, TO THE POINT OF BEGINNING (POB), TOTAL AREA OF THE ABOVE DESCRIBED PARCEL B IS 1,967,380 SQUARE FEET (45,16 ACRES) MORE OR LESS, DISTANCES ARE BASED OFF THE U.& SURVEY FOOT PER COLORADO NORTH STATE PLANE (NAD83)(GROUND), NORTH ZONE (0501). THE AUTHOR OF THIS DESCRIPTION IS KEVIN .1. MARTIN, PLS 38580, PREPARED FOR AND ON BEHALF OF ASCENT GEOIVIATICS, 8620 WOLFF COURT, WESTMINSTER, COLORADO 80031, ON NOVEMBER 6m, 2024, UNDER .SOB NUMBER NOB_240011, AND IS NOT TO BE CONSTRUED AS REPRESENTING A ONUMENTED LAND SURVEY, Kevin J. Martin, PLS 38580 Job No.: NOB B2 0011 For and on Behalf of Ascent Geomatics Solutions Ascent C Bornat ics - 8620 Wolff Court Westminster, CO 80031 www.ascentgtomaticsacom Page 2 of 3 N4 COR. SEC. 2 FND. 3h" ALUM. CAP STAMPED: LS 7242 DATED 1993 =1CR 744 _ — LOT A RECORDED EXEMPTION NO. 0803-02--1— RE1142 REC. NO, 2169382 SW CORNER LOT A, RE --1142 t— N DO rocn t z O uj _z z SEC, TeN, Rear O COR, SEC, 2 FNa, 3Y.c" ALUM. OAP STAMPED. LS 4392 DATED: 2009 500P GRAPHIC SCALE: I" = 500' PREPARED tilt 1 y"3 iA3n S �6 :, . Ascent Ceornaks Solutions 862O Wolff Court Westminster, CO 80031 (303) 928.7128 INEY4 SECTION 2, TOWNSHIP 8 NORTH ANNE 85 WEST ALSO KNOWN A8 PARCEL #080302000066 BY THE WELD COUNTY ASSESSOR'S OFFICE WELD COUNTY, COLORADO SE CORNER LOT A, RE -1142 S. LINE NEY4. SEC. 2 law _ PI S88'48'18"E 2682.68' N. LINE, NEY SEC. 2 PARCEL A S88'48°18"E 468.85' SUO'QO'00nE 93.54' 389%44135"E 685.691 SOC•Oa'O1 r'E 42.83' MEMORANDUM OF LEASE REC. NO. 4360281 N89'4C'0Cl1W 2862.26' LEGEND SECTION (ALIQUOT) LINE QUARTER SECTION LINE mine PARCEL BOUNDARY LEASE BOUNDARY - EXISTING EASEMENT FOUND MONUMENT AS NOTED CORNER FOUND WELD COUNTY ROAD RIGHT-OF-WAY POINT OF COMMENCEMENT POINT OF BEGINNING .-_ COR { FND ROWtf 11R ROC 1000' ROB NOM: ._ THIS IS NOT A MCNUMENTED SURVEY. Petroleum Field Services LLC 11. IS INTENDED ONLY TO BE A GRAPHIC DEPICTION OF THE ATTACHED DESCRIPTION. d. ,a. Ascent Geomatics Solutions 919.9.4.1111. P OB N89'44'35"W 1111.22' SCC'T8'24"E 293.79' E.Y4 COR. SEC, 2 FND. 3Y.t" ALUM. CAP STAMPED. PLS 38149 €}ATED 2017 00 L., Ov:. • NE COR. SEC. 2 END. an" ALUM. CAMP r STAMPED: LS 4392 DATED 1994 OC `a- O (NI a z a EF (I) CO w c w o < o co fn La.] DCP ACCESS EASEMENT REC. NO.436O281 4; _ ;-.9 #' 38580 IX � s : # li-o6 X � : it ;S ; 0_,, �/y{•f#,.ate P a +r + * s i {� � f_Li+�}5� f r } } r � PREPARED RA: Chevron tir Kevin J. Martina PLS 38580 ,fob No.: NOB 82400 1 1 For and on Behalf of PARCEL B File Name: TOPOILPARDEL_EXHIBITS Project No, NOB,B24D011 Print Dote: 11 —OS -2024 Sheet; 3 o 3 Authorization Farm 'e give permission to Kyle Myers I, ), r g P - - (Owner - please print) (Authorized Agent/Applicant-please print) Departments of Planning Building, Development Review and Environmental health 1402 N 17TH Avenue P.O. Box 758 Greeley, CO 80632 Brian DeRose to apply for any Planning, Building, Access, Grading or OWTS permits on our behalf, for the property located at (address or parcel number) below: 35895 Co Rd 4'7, Eaton, CO 80615, Parcel Number 080302100004 Part of the south half of the � B �� Legal Description: NE1/4 of Section , Township N, Range SubdivisionName:Lot NIA Bloch Nib` Property Owners Information:Noble Energy Inc.t a.k.a. Chevron U A.A. Inc. Rockies Business Unit Address: 4000 Burlington Ave, Evens, CO 80260 970-342-0135 Phone: Bian.DeRose@Chevron.com E-mail: Authorized Agent/Applicant Contact Information: Address: 2115 117th Avenue, Greeley, CO 80634 Kyle Myers, Chevron Rockies Business Unit 970-415-2006 kyle.myers@chevron.com chevron.com Phone E -Mail: h Correspondence to be sent to: Owner Authorized .Agent/Applicant � by. Mail Email_ Additional Info: I (We) hereby certify, sunder penalty of perjury and after carefully reading the entire contents of this document, that the information stated above is true and correct to the best of ray (our) knowledge. Owner Signature Owner Signature Subscribed and sworn to before me this 0 day of ritt 2r14,ri My commission expires /'" r1 1 � � i eL-4- REBECCA L JOHNSON NOTARY PUBLIC STATE OF COLORADO NOTARY Its 20174016200 MY COMMISSION EXPIRES APRIL 14, 2029 q. Notary Public by Departments of Planning Building, Development Review and Environmental Health 1402 N 17TH Avenue P.O. Box 758 Greeley, CO 80632 Authorization Form Brian DeRose Tisa ,Juanicvrena I, (We), , give permission to (Owner — please print) (Authorized Agent/Applicant—please print) to apply for any Planning, Building, Access, Grading or OWTS permits an our behalf, for the property located at (address or parcel number) below: 35595 Co Fed 47, Eaton, CO 80515, Parcel Number 0803 2100004 Part of the south half of the Legal Description: N E1 /4 Subdivision Name: N/A of Section , To rnshi B N, Ran a 65 ' p.. Rang Lot N/A Block N/A Property ners Information : Noble Energy Inc., a. k.a. Chevron U .A.A. Inc. Rockies Business Unit Address: 4000 Burlington Ave, Evans, CO 80260 978-342-8135 Phone: E-mail: Brian.DeRose@Chevron.com Authorized Agent/Applicant Contact Information: Address: 2 115 117th Avenue, Greeley, CO 80634 Phone: Tisa ,Juaniccrena, Chevron Rockies Business Unit iTsa.Juanicorena@chevron.com a i l: T,J sa.uan icorena@chevron .earn Correspondence to be sent to: Owner Authorized Agent/Applicant by. Mail Email Additional Info: I (We) hereby certify, under penatty of perjury and after carefully reading the entire contents of this document, that the information stated above is true and correct to the best of my (our) knowledge. Owner Signature Date Owner Signature Subscribed and swam to before me this � 1*) day of April] 2fl by My commission expires REBECCA L JOHNSON NOTARY PUBLIC STATE OF COLORADO NOTARY ID 20174016200 riser nmtv1ISSION EXPIRES APRIL 14, 2029 f Notary Public Departments of Planning Building, Development Review and Environmental Health 1 402 N 1 7Thi Avenue P.O. Box 758 Greeley, CO 80832 Authorization Form Brian DeRose Amy Conway, Tetra Tech I, (We), , give permission to (Authorized Agent/Applicant—please print) (Owner— please print) to apply for any Planning, Building, Access, Grading or OWTS permits on our behalf, for the property located at (address or parcel number) below: 85895 Co Rd 47, Eaton, CO 80615, subdivided portion of APN 0803-02-0-00-066 Lot B of RE -1142 & the south hale Legal Description: of the NE1/4 ----- of Section NSA Subdivision Name: Township 5 N, Range 55 g Lot N/A Flock NIA Property Noble Energy Inc., a.k.a. Chevron U.A.A. Inc. Rockies Business Unit i-'ro p y Owners Information: 4800 Burlington Ave, Bvanst CO 80280 Address. Phone. 970-342-8185 E-rnalt. Amy Conway, Tetra Tech Inc. Authorized Agent/Applicant Contact In formation: Address: 851 Coffman Street, Suite 200, Longmont, CO 80501 .. ...... . . 720-864-4515 amy.conway@tetratech.com Phone: E -Mail: Brian.DeRose@Chevron.com Correspondence to be sent to: Owner y Authorized Agent/Applicant by: Mail Email Additional Info: i (we) hereby certify, under penalty of perjury and after carefully reading the entire contents of this document, that the information stated above is true and correct to the best of ray (our) knowledge_ Owner Signature Subscribed and sworn to before rye this Sficto PcDs e My commission expires REBECCA L JOHNSON NOTARY PUBLIC STATE OF COLORADO NOTARY ID 20174015200 MY COMMISSION EXPIRES APRIL 14, 2025 Owner Signature day of Date 0 ✓eziti1- , 20 O? � - by Notary Public SPECIAL POWER OF A'TTORNEY KNOW ALL PERSONS that CHEVRON U.S.A. INC., a corporation duly organized and existing under the laws of Pennsylvania, United States of America (the "Company"), APPOINTS persons listed on Exhibit "A" in hislher capacity as an employee, a true and lawful general agent, legal representative, and Attorney -in -Fact of the Company (the "Attorney -in -Fact") with special power and authority in its name and on its behalf to execute and perform the following: 1. To sign and execute, upon terms and conditions as the Attorney -in -Fact deems appropriate, all legally -binding documents related to the exploration, development and production activities of the Company, including rebated abandonment and remediation, acquisition and divestment, administrative, commercial, financial, environmental., human resources, land, legal, procurement, safety, technology and other services and commitmentsexcept as herein below stated, and no authority is conferred by this Power of Attorney for execution of the following: a. Leases or deeds to others covering oil, gas or other hydrocarbon or nonhdrocarbon minerals underlying fee lands of this Corporation where either book value or sale price exceed , or the acreage e x e ee d s • b. Deeds or conveyances to others covering fee lands of Corporation, other than rights of way and similar easements, where either book value or sale price exceeds c. Documents, instruments or promissory notes in support of any borrowings; ,provided, however, that promissory notes and other documents given as consideration for the acquisition of real or personal property shall not be deemed to constitute a borrowing* and Documents or agreements establishing bank accounts in the name of Company or withdrawing ing of funds or closing of any bank accounts of Company. 2. To perform every act and thing, that may be necessary to carry out the granted powers as fully as the Company might itself do however, no delegation or substitution of the pourers granted herein by the Attorney -in -Fact is permitted. Unless sooner revoked or terminated, this Power of Attorney shall remain in full force and effect from and after December S, 2023, through Novem - r 16, 2024, or until the Attomeyy in -Fact is no longer are employee of Chevron U.S.,A., Inc., or its affiliates, whichever occurs first* Upon revocation or other termination this Powver of Attorney shall be returnee[ to the Company but the failure so to return it shall not prevent its revocation or termination, IN WITNESS WHEREOF, the Company has caused this instrument to be executed this December 12, 2023n, CHEVRON U.S.A. INC. By. Harpreet K. Tiw+rana, Assistant Secretary (Insert t Notary Stamp below) 'CALIFORNIA ALL0PURPOSE ACKNOWLEDGMENT CIVIL CODE § 1189 A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, .and not the truthfulness, accuracy, or validity of that document. A' t h OF CALIFORNIA � / ss COUNTY OF CONTRA COSTA 3 On December !2s 2023, before me, R. Gore, Notary Public, Personally Appeared Harpreet K. Tirana who proved to me an the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorised capacity(ies), and that b ► his/her/their signature(s) on the instrument the person(s), or the entity upon behalf of which the person(s) acted, executed the instrument. I certify under Penalty of Perjury under the laws of the State of California that the foregoing paragraph is true and correct. WITNESS my hand and official seal. Signature of Notary Public My Commis on Expires: October 3, 2027'' Re GORE Nary Rutaitc - California Cow Costa County Commission # 2464591 X COrter, Expires Oct It 2037 'lace Official Notary Seal here. Exhibit A Antonio, Ryan Boyd, Trudi Brock Nick DeRose, Brian Gilmore, Brian Goddard, Carrie Helburg, Kelsey Otness, Matthew Rains, David B Shannon, Tina Stilling% Matthew Strathrnan, Dike Stubbs, Kevin Wo ciechowicz, Jason Zappanti, John DowSign Envelope ID: F7EFD043-2214-4042-8x70-5B1 D3C9A4341 Chevron %.1 Kari H. Endries Assistant Secretary CHEVRON CORPORATION CERTIFICATE OF ASSISTANT SECRETARY I, Kari H. Endries, Assistant Secretary of CHEVRON CORPORATION, a corporation duly organized under the laws of the State of Delaware, United States of America (the "Corporation"), do hereby certify the following as true and correct statements of fact: I ) Noble Energy, Inc., a company organized under the laws of Delaware, United States of America, is a wholly owned, direct subsidiary of the Corporation. 2) The attached Exhibit A is a true and correct Chain of Ownership Chart regarding the legal ownership structure of Noble Energy, Inc. IN WITNESS WHEREOF, I have hereunto set my hand and seal of the Corporation this 21St day of May 2024. CHEVRON CORPORATION -OocuSigfled by: Kari H, Endries `— 350084F927F7407 Kari H. Endries Assistant Secretary Chevron Corporation 5041 Executive Parkway, Suite 200 San Ramon, CA 94583 DocuSign Envelope ID: F7EFD043-2214-4042-8D70-581 D3C9A4341 Chevron ION. %I. Exhibit A - Chain of Ownership Chart Noble Energy, Inc. May 21, 2024 Chevron Corporation (United States) 100% Noble Energy, Inc. (United States) TETRA TECH December 2, 2024 Maxwell Nader Planning Manager Department of Planning Services, Weld County 1402 N. 17th Ave. Greeley, CO 80631 RE: New Submittal of Use by Special Review (USR) Application for Proposed New Development Storage Facility, PRE24-0270 Dear Mr. Nader: We are pleased to present our new submittal package for aSite-Specific Development Plan and Use by Special Review Permit, for Oil and Gas Support and Service (Material Storage Yard, specifically for recycled road base, riprap, etc.) outside of subdivisions and historic townsites in the A (Agricultural) Zone District. The project will be located on land owned by Noble Energy Inc. (a.k.a. Chevron U.A.A. Inc. Rockies Business Unit, or Chevron) that is located southwest of the intersection of WCR 74 and WCR 47 on Parcel No. 0803.02.0.00.066, which is currently in the process of being subdivided into three smaller parcels via Warranty Deed. On September 12, 2023, there was a Pre -Application Meeting (PRE23-0230) to discuss submittal of a new Use by Special Review (USR) application to accommodate the proposed storage facility on a portion of the property that Noble Energy was not using or leasing. The application for this USR was submitted on June 3, 2024, and it included all land on Parcel No. 0803.02.0.00.066 excluding the land included in SUBX18-0001. Following a completeness review, the application was rejected indicating that to have an additional use on Parcel No. 0803.02.0.00.066, we would need to amend USR18-0018. To resolve this conflict and allow Chevron to move forward with their proposed storage facility use, Chevron is in the process of subdividing Parcel No. 0803.02.0.00.066 into three separate parcels, each being a minimum of 35 -acres, via warranty Deed. One of the new parcels will entirely encompass the SUBX18-0001/USR18-0018 so that DCP's special use will not encumber the other two new parcels, including the parcel for this proposed new USR. In addition to the change in parcel boundaries to prevent conflicting USRs, there were several comments received on June 26, 2024, during the initial completeness review of the previous submittal under PRE23-0230 that have been addressed in this new submittal package: Comment from Department of Planning Services: I could not verify that Mr. Myers could sign on behalf of Chevron (in reviewing the Delegation of Authority Document). Response: Documents have been revised and Chevron signatures are by Brian DeRose, who is listed in the Delegation ofAuthority document. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 8501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com Use by Special Review - Submittal Cover Letter December 2, 2024 Comment from Department of Environmental Health: Please provide the following: 1. Dust Mitigation Plan 2. Waste Handling Plan. Response: A Dust Mitigation Plan and a Waste Handling Plan have been added. Comment from Development Review Department: The drainage report submitted (without the appendices referenced in the report) does not include all of the highlighted items identified on the Drainage Report Checklist as necessary for a complete preliminary drainage report. (The Drainage Report Checklist was provided to the applicant during the pre -application conference. It was contained within the Development Review Pre -application Comments). Response: The Preliminary Drainage Report now includes all appendices. In addition, it has been revised to reflect the new parcel boundary and associated site plan and grading modifications. Comment from Development Review Department: The Transportation Memo submitted does not include information for all of the four (4) items listed on the Traffic Narrative. (The Traffic Narrative was provided to the applicant during the preapplication conference. It was contained within the Development Review Pre -application Comments). Response: The Transportation Memo includes all four items listed on the Traffic Narrative checklist in Tabe! 1. In addition, it has been revised to reflect the new parcel boundary. There were no changes to anticipated traffic for the site. Thank you for your time and consideration of this application. We look forward to working with you on this project. Sincerely, TETRA TECH an, (d'u4toe Amy Conway, LEED AP, AICP Candidate Senior Planner cc: Kyle Myers, Chevron Rockies Business Unit (kyle.myers@chevron.com) Brian Amsberry, Chevron Rockies Business Unit (brian.amsberryPchevron.com) D:\Projects\Longmont\7116\117-7116003\Deliverables\USRApplication\2024-12-02_USRSubmittal Package\01. USR Submittal Cover Letter.docx TETRA TECH TETRA TECH WELD COUNTY -USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 09. PLANNING QUESTIONNAIRE 1. Explain the proposed use and business name. The proposed use is a material storage yard and field office for oil and gas support services. The yard will store recycled road base, riprap, and other construction materials necessary for Chevron's Colt Maverick and West Pony development areas, and the field office will be used by Chevron as office space. The business name is Chevron North America Exploration and Production Company New Development Storage Facility. 2. Explain the need for the proposed use. Chevron is proposing this facility to enhance operational efficiency by reducing transportation distances for materials. Currently, materials required for location builds (e.g., recycled road base, riprap, etc.) are stored at Chevron's LaSalle yard located over 13.5 miles away, off WCR 49 and WCR 46. This new location will reduce the impact to County residents and roads by reducing truck travel and expediting construction in the nearby development areas (See GIS map Figure 1). 3. Describe the current and previous use of the land. The land is currently vacant, non -irrigated agricultural dry rangeland. There are multiple active and inactive oil and gas wells on the site. Historically, the land has been used for agricultural purposes but is not actively farmed at this time. Currently, DCP Midstream (DCP) has existing permitted uses on the original parcel. USR18-0057 is an approved Use by Special Review Permit fora 12 -inch natural gas pipeline route that runs across a portion of the south end of the proposed parcel to the compressor station. USR18-0018 is an approved Use by Special Review Permit for DCP's NorthStar Compressor Station and Subdivision Exemption lot (SUBX18- 0001) was created to permit the special use on -site. The proposed parcel subdivision will create three separate parcels (A, B, and C) of 35 acres or larger via Warranty Deed. The subdivision is designed so that the boundary of the new Parcel C will completely contain the SUBX18-0001 boundary, which surrounds DCP's lease area from Chevron. Therefore, DCP's special use (USR18-0018) will not encumber the project site (Parcel B) or the other new parcel (Parcel A) (see Exhibit A). 4. Describe the proximity of the proposed use to residences. The closest residences are approximately 1,550 feet north, 1,500 feet south, 1,750 feet southeast, and 2,300 feet northeast of the site. The project site is located approximately 100 feet west of the existing DCP Midstream NorthStar Compressor Station boundary, in the southwest portion of the former 150 -acre parcel. The facility is situated as far as possible from residences and the exterior of the overall lot, and the topography provides visual buffer. 5. Describe the surrounding land uses of the site and how the proposed use is compatible with them. The proposed facility is situated within an area characterized by a mix of agricultural activities and oil and gas operations. The proposed use is compatible with these surrounding land uses due to its similar TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com Use by Special Review - Planning Questionnaire December 2, 2024 industrial nature, minimal environmental impact, and mitigation measures in place to reduce noise, dust, and traffic disturbances. • North: o Land Use: Oil and gas waste disposal facility (USR15-0006) and a rural residence (1,550 feet away). o Compatibility: The proposed storage yard aligns with the industrial nature of the nearby oil and gas facility. The residence is buffered by distance and an existing barn, minimizing any potential impact. • East: o Land Use: DCP Midstream NorthStar Compressor Station (USR18-0018), an agricultural operation and Oil and Gas support operation USR (4MUSR21-01-1282) approved for a livestock confinement and feeding operation for up to 11,240 head of cattle, and a rural residence east of the intersection of WCR 47 and WCR 74 (over'/2 mile away). o Compatibility: The proposed yard complements the adjacent oil and gas operations. The residence is directly adjacent to the proposed northern haul route for semi -trucks and other traffic entering and exiting the new fill storage yard. In the Traffic Narrative that accompanies this USR application, Chevron proposes to mitigate any traffic disturbances to the property. • South: o Land Use: Irrigated farmland and active oil and gas wells; rural residence 1,750 feet to the southeast; rural residence 1,500 feet due south. o Compatibility: The proposed use fits with the surrounding industrial and agricultural operations. The USR18-0018 compressor station sits between the southeast residence and the proposed new fill storage yard. Distance and the compressor station create a buffer with this home. The residence due south is buffered by distance and the active farmland. • West: o Land Use: Irrigated farmland, with homes more than half a mile away and screened by topography. o Compatibility: The distance and natural screening ensure minimal visual or operational impact on the homes to the west. 6. Describe the hours and days of operation (i.e. Monday thru Friday 8:00 a. m, to 5:00 p.m.). The facility will operate during daylight hours, Monday through Saturday, six days a week. Operations will be limited to these hours to minimize disturbances to the surrounding community. 7. Describe the number of employees including full-time, part-time and contractors. If shift work is proposed, detail number of employees, schedule and duration of shifts. Up to 55 people will access the site daily during peak activity. This would include: • 2 Operators (Full Time & on -site) The operators will be responsible for loading trucks and pushing materials to the loader. These are the only full-time on -site employees during operations. • 3 Supervisors will visit the site temporarily over each day. TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 • Up to 20 semi -truck drivers for approximately 20 semi -truck trips (belly dump trucks or tandem dump trucks) to and from the site each day, at different times. • 5 lease operators accessing the site to use the regional field office trailer. These lease operators will access the site for temporary office use when in the field and will use the field office for internet access and office work activity as needed. • Up to 25 field staff will access the site to visit the regional field office trailer up to once a month to attend monthly team meetings. These meetings will last, on average,1 to 2 hours on -site. 8. Describe the maximum number of users, patrons, members, buyers or other visitors that the site will accommodate at any one time. No users, patrons, members, buyers, or other visitors are anticipated. 9. List the types and maximum numbers of animals to be on the site at any one time (for dairies, livestock confinement operations, kennels, etc.). No animals will be present on the site. 10. List the types and number of operating and processing equipment. Anticipated equipment includes a loader, a bulldozer, and a motor grader for loading/unloading and moving storage materials to their proper locations in the yard area. There will also be a skid steer for mowing and stormwater repair work, a tractor for weed spraying, and a water truck for dust mitigation. Belly dump trucks and/or tandem dump trucks will bring material to and from the site. Additionally, up to 10 passenger work trucks/vehicles could be on -site each day and an additional 25 passenger work trucks/vehicles once a month for team meetings. 11. List the types, number and uses of the existing and proposed structures. The facility will have two double -wide mobile office trailers - one used as a fill storage site office, and one as a regional field office for Chevron's lease operators. Two Conex storage containers are also proposed. Storage "bunks" will be created using concrete jersey barriers to store rock and construction materials. Tracking pads will be installed at the access gates. The entire storage yard will be fenced for security and visual mitigation. Two detention basins will need to be constructed on the downgradient (east) side of the site to mitigate the effects of stormwater runoff from the developed site. 12. Describe the size of any stockpile, storage or waste areas. Once the facility is fully constructed and in operation, stockpiles of clean fill storage materials will be on - site during the duration of the proposed use. These materials will include road base aggregate, riprap, and other clean fill materials. During times of inactivity, all unused stockpile materials will remain on -site until operations resume. No waste materials will be stored. 13. Describe the method and time schedule of removal or disposal of debris, junk and other wastes associated with the proposed use. Minimal waste will be generated on -site. Daily office trash will be stored in commercial containers and removed weekly by a licensed disposal service. Temporary portable toilets will be cleaned and serviced regularly by a private contractor and removed from the site completely when the yard is not in operation. 14. Include a timetable showing the periods of time required for the construction of the operation. Construction will take approximately 30 days: TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 • Day 1- Haul in heavy equipment including a Bulldozer blade and a wheel tractor scraper. This will require two loads with lowboy semi -trailers. Four employees will be needed on -site which include the heavy equipment operators and the semi -truck drivers. • Day 2 through 4 - The Bulldozer, blade and wheel tractor scraper will strip the topsoil. BM P's include the heavy equipment operators and 3 additional roustabout crew members on -site. • Day 4 through 14 - A soil compactor will be hauled to the sight via low -boy semi -trailer and will work with the bulldozer and blade to build the site laydown yard from the new road base materials delivered to the site each day. During this time 15 semi -trucks will bring in 6 rounds of new road base each day to bring in the construction materials needed to build the new storage yard. Additionally, 1 water truck will make 4 round trips each day to the site to mitigate dust from the construction activities. There will be 18 employees needed on -site each day including 16 truck drivers and 2 heavy equipment operators. • Day 15 through 30 - Stormwater structures will be developed, and the bulldozer blade and compactor will be used to construct these structures on -site. additionally, 15 semi -trucks will bring 6 rounds of new road base into the site each day and 1 water truck will continue to bring in 4 loads of fresh water each day for dust mitigation. There will be 20-22 employees needed on -site during this period of construction including 16 truck drivers, 2 heavy equipment operators, and up to 6 roustabout employees needed for seeding and rip rap spreading. 15. Describe the proposed and existing lot surface type and the square footage of each type (i.e. asphalt, gravel, landscaping, dirt, grass, buildings). The existing lot surface is unmodified native grasses and soil. The total construction area is approximately 468,500 square feet, with road base covering an estimated 289,100 square feet and the remaining areas dedicated to stormwater channels and berms. The total footprint of the office trailers and Conex boxes is estimated to be up to 5,000 square feet. Both office trailers will be installed on temporary block and tie foundations and skirted limiting their impact on the drainage on -site. 16. How many parking spaces are proposed? How many handicap -accessible parking spaces are proposed? A general parking area for up to 10 passenger vehicles is proposed next to the office trailers. No formal parking spaces will be created and no handicapped spaces are proposed as the facility will not be open to the general public. Since most of the pad site will be covered in road base, additional temporary parking for up to 25 additional passenger vehicles once a month can be accommodated north of the access road, next to the office trailers. 17. Describe the existing and proposed fencing and screening for the site including all parking and outdoor storage areas. Existing pipe fencing completely surrounds an active oil and gas wellhead located completely within the proposed storage yard. The remaining area proposed for development is vacant agricultural dry pasture/range land without improvements. An eight -foot -tall chain -link fence with opaque slats for visual screening is proposed around the new facility. This will enclose the entire storage yard, including the office trailers, storage containers, and material stockpiles. 18. Describe the existing and proposed landscaping for the site. There are no existing landscaping improvements on the non -irrigated dryland/pasture site, and no landscaping is proposed for this USR. TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 19. Describe reclamation procedures to be employed as stages of the operation are phased out or upon cessation of the Use by Special Review activity. When Chevron no longer needs the facility, all materials and structures related to the storage yard will be removed. If the site is repurposed, Chevron will apply for the necessary permits. 24. Describe the proposed fire protection measures. The site is within the Galeton Fire Protection District. Before submitting this application, Chevron contacted fire district Chief (Russ Kane) to discuss emergency service response needs. Per the Fire Chief's review of Chevron's proposal, the access to the site is more than adequate for emergency response needs and no additional fire suppression measures will be necessary on -site. In emergencies, the fire department will cut locked gates for access. 21. Explain how this proposal is consistent with the Weld County Comprehensive Plan per Chapter 22 of the Weld County Code. The proposed facility has been engineered, designed, and sited to be consistent with the intent of the Comprehensive Plan guiding principles listed in section 22.2.10 of the weld County code. Applicable policies or goals from the Comprehensive Plan (italic font) are listed below, accompanied by a statement illustrating how this proposed facility conforms. A. Respecting Our Agricultural Heritage. Weld County has an agricultural heritage built upon the hard work of pioneers and farmers on traditional family farms. Weld County is now one of the most economically productive agricultural counties in the nation. The Weld County Right to Farm Statement and the Goals and Objectives in this Plan support the importance of agriculture in the County. The proposed storage yard is located on a non -irrigated, inactive agricultural parcel. The site is not being used for active farming or irrigation, ensuring no disruption to the county's agricultural operations. By placing the yard in an area that already supports oil and gas activities, the project minimizes its impact on productive agricultural land, thereby aligning with the county's goal of preserving its agricultural heritage. B. Respecting Private Property Rights. One of the basic principles upon which the United States was founded is the right of citizens to own and utilize property so long as that use complies with local regulations and does not interfere with or infringe upon the rights of others. Chevron has made efforts to respect the rights of neighboring landowners. The company sent a formal letter to all adjacent neighbors and property owners with detailed maps and information on the proposed project's operational needs and site design layout. They requested feedback and amended the site design to address all initial concerns from neighboring landowners. This Use by Special Review permitting process will further ensure that agreed -upon development standards, local regulations, and conditions of approval will be met before facility construction and operation. C. Promoting Economic Growth and Stability. Land use policies have a significant impact on economic conditions in the County and should be structured to encourage economic prosperity. To ensure the continued strength of Weld County's economy, land use processes and decisions based on this plan shall be consistent and promote fiscally responsible growth. The proposed storage yard will improve Chevron's operational efficiency by reducing transportation distances for construction materials, ultimately benefiting regional development. This project supports ongoing energy development, which is a significant contributor to weld County's economy. While not TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 classified as essential infrastructure, the facility plays a key role in Chevron's supply chain, contributing to economic stability through job creation and regional support. D. Protecting Health, Safety, and General Welfare. Land use regulations and policies will protect and enhance the health, safety, and general welfare of the citizens of Weld County. The project reduces transportation -related impacts by shortening travel distances for material deliveries, which will lead to decreased road wear and traffic congestion. Dust control, limited operating hours, and traffic management measures are designed to minimize noise and air quality impacts on nearby residences. The project incorporates stormwater management and addresses environmental concerns, all of which align with the county's goal of safeguarding public health, safety, and welfare. The proposed land use meets the intent of all four goals detailed in section 22-2-34 of the Weld County code. First goal: "Land use changes should not inhibit agricultural production nor operations." The development is proposed on dry, inactive farmland not currently used for agricultural production or operation. No impacts will be made to existing agricultural production uses nearby or within the County. Second goal: "Limit the density and intensity of development to maintain agricultural areas." This project is proposed to be sited adjacent to two similar agricultural -zoned parcels with existing and approved USR permits for active natural resource extraction and energy support service uses. Placing this new use in this location aligns with the County's goal of limiting the density and intensity of the development to maintain agricultural areas. This project area utilizes unfarmed land without intensive mineral extraction and energy support services, with minimal effect on the nearby agricultural uses. Third goal: "Respect agricultural practices regarding water resources." The project will not be located near an existing agricultural ditch or water body used for agricultural operations in the area. Once fully constructed, it will be designed to meet all county regulations related to grading and drainage from the site. Fourth goal: "Farming or ranching operations are not considered a nuisance as long as they employ common or reasonable agricultural practices." The proposed new fill storage yard has no farming or ranching operations, nor unreasonable agricultural practices. Chevron respects the right to farm and the longstanding agricultural practices within the County. 22. Explain how this proposal is consistent with the intent of the zone district in which it is located. (Intent statements can be found at the beginning of each zone district section in Article 111 of Chapter 23 of the Weld County Code.) Section 23-2-10 of the Weld County Code states: "TheA (Agricultural) Zone District is intended to provide areas for the conduct of agricultural activities and activities related to agriculture and agricultural production, and for areas for natural resource extraction and energy development, without the interference of other, incompatible land USES." The proposed use of the site does not interfere with the adjacent agricultural uses. This proposed use also meets the intent to promote natural resource extraction, as it creates infrastructure for the numerous Chevron mineral resource production sites across Weld County. TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 23. Explain how this proposal will be compatible with future development of the surrounding area or adopted master plans of affected municipalities. The site is located in a non -urbanized area of weld County and is not located within the growth area boundary of any municipality. The proposed use aligns with future land use plans and the intent of the non -urbanized agricultural zone district in unincorporated Weld County by supporting industrial and agricultural activities without disrupting nearby landowners. 24. Explain how this proposal impacts the protection of the health, safety and welfare of the inhabitants of the neighborhood and the County. The project will reduce traffic congestion by shortening travel distances for material transport, thereby improving public safety. Dust control, traffic management, and limited operating hours will minimize disruptions to surrounding landowners. 25. Describe any irrigation features. If the proposed use is to be located in the A (Agricultural) Zone District, explain your efforts to conserve prime agricultural land in the locational decision for the proposed use. There are no existing or proposed irrigation features on the site. The land is non -irrigated dry pastureland. The proposed site is adjacent to two similar agricultural zoned parcels with existing and approved USR permits for active natural resource extraction and energy support service uses. It was selected in part because the property was not located on prime agricultural land currently in production. The parcel also currently has a significant amount of oil and gas activity active on the site, and it is located adjacent to multiple parcels with more intensive mineral extraction, animal confinement, and dairy operation uses. The more intensive surrounding uses separate the proposed storage yard from surrounding agricultural parcels that contain prime agricultural land. 26. Explain how this proposal complies with Article V and Article xl of Chapter 23 if the proposal is located within any overlay Zoning District (Airport, Geologic Hazard, or Historic Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps officially adopted by the County. The site is not located within any Weld County Overlay Zoning Districts or Special Flood Hazard Areas. 27. Detail known State or Federal permits required for your proposed use(s) and the status of each permit. Provide a copy of any application or permit. Chevron will apply for an Air Pollutant Emission Notice (APEN) permit from the Colorado Department of Public Health and Environment (CDPHE) if required prior to construction. A copy of the approved APEN, if applicable, will be provided to the County as needed once received. No other state or federal permits are required for this use. O:\Projects\Longmont\7116\117-7116003\Deliverables\USRApplication\2024-12-02_USRSubmittal Package\09. USR Planning Questionnaire.docx TETRA TECH Use by Special Review - Planning Questionnaire December 2, 2024 PROPOSED NEW DEVELOPMENT STORAGE YARD PARCEL EXISTING CHEVRON LASA.LLE STORAGE YA.RD (LISR-1570) �WELD COUNT'S BOUNDARY CHEVRON'S REGIONAL DEVELOPMENT AREAS STATEFEDERAL HIGHWAYS & INTERST.AvTES COUNTY ROADWAYS hoRrNI PAL ROADWAYS WELD cowry. COLORADO COMPARING REGIONAL DEVELOPMEUT AREAS TO EXISTING &. PROPOSED DEVELOPMENT STORAGE YARD LOCATIONS TETRA TECH ASCENT GEOMATICS SOLUTIONS EXHIBIT A A PARCEL OF LAND LYING IN THE NORTHEAST QUARTER OF SECTION 2, TOWNSHIP 6 NORTH, RANGE 65 WEST OF THE 6m PRINCIPAL MERIDIAN, COUNTY OF WELD, STATE OF COLORADO, BEING A PORTION OF THAT TRACT OF LAND DESCRIBED UNDER RECEPTION NUMBER 4777590, WELD COUNTY RECORDS, MORE PARTICULARLY DESCRIBED AS FOLLOWS: PARCEL B COMMENCING AT THE NORTHEAST CORNER OF SAID SECTION 2, AS MONUMENTED BY A FOUND 3-1/4" ALUMINUM CAP STAMPED "LS 4392," WHENCE THE EAST QUARTER CORNER OF SAID SECTION 2, AS MONUMENTED BY A FOUND 3-1/4" ALUMINUM CAP STAMPED "PLS 38149", BEARS SOUTH 00°16'24" EAST A DISTANCE OF 2,609.14 FEET, BEING THE BASIS OF BEARINGS IN THIS DESCRIPTION. THENCE SOUTH 00°16'24" EAST, ALONG THE EAST LINE OF SAID NORTHEAST QUARTER, A DISTANCE OF 1,315.50 FEET; THENCE DEPARTING SAID EAST LINE, NORTH 89°44'35" WEST, A DISTANCE OF 1,111.22 FEET, TO THE POINT OF BEGINNING (POB); THENCE SOUTH 00°00'01" EAST, A DISTANCE OF 42.83 FEET, TO THE NORTHERLY LINE OF THAT MEMORANDUM OF LEASE RECORDED UNDER RECEPTION NUMBER 4360281, ON FILE IN THE WELD COUNTY CLERK AND RECORDS OFFICE; THENCE ALONG SAID LEASE THE FOLLOWING FOUR COURSES: SOUTH 00°00'01" EAST, A DISTANCE OF 141.00 FEET; SOUTH 89°59'59" WEST, A DISTANCE OF 539.00 FEET; SOUTH 00°00'01" EAST, A DISTANCE OF 821.00 FEET; NORTH 89°59'59" EAST, A DISTANCE OF 832.00 FEET; THENCE DEPARTING SAID LEASE, SOUTH 90°00'00" EAST, A DISTANCE OF 822.97 FEET, TO A POINT ON SAID EAST LINE; THENCE SOUTH 00°16'24" EAST, ALONG SAID EAST LINE, A DISTANCE OF 293.79 FEET, TO SAID EAST QUARTER CORNER; THENCE NORTH 89°40'00" WEST, ALONG THE SOUTH LINE OF SAID NORTHEAST QUARTER, A DISTANCE OF 2,662.26 FEET, TO THE CENTER QUARTER CORNER OF SAID SECTION 2, AS MONUMENTED BY A FOUND 3-1/4" ALUMINUM CAP STAMPED "LS 4392"; Ascent Geomatics - 8620 Wolff Court Westminster, CO 80031 www.ascentgeomatics.com Page 1of3 THENCE NORTH 00°16'00" WEST, ALONG THE WEST LINE OF SAID NORTHEAST QUARTER, A DISTANCE OF 1,397.81 FEET, TO THE SOUTHWEST CORNER OF LOT A OF RECORDED EXEMPTION NO. 0803-02-1- RE1142, AS DESCRIBED IN THAT DOCUMENT RECORDED UNDER RECEPTION NUMBER 2169382, ON FILE IN THE WELD COUNTY CLERK AND RECORDERS OFFICE; THENCE DEPARTING SAID WEST LINE, SOUTH 88°48'18" EAST, ALONG THE SOUTH LINE OF SAID LOT A, A DISTANCE OF 400.00 FEET, TO THE SOUTHEAST CORNER OF SAID LOT A; THENCE DEPARTING SAID SOUTH LINE, SOUTH 88°48'18" EAST, A DISTANCE OF 465.85 FEET; THENCE SOUTH 00°00'00 EAST, A DISTANCE OF 93.54 FEET; THENCE SOUTH 89°44'35" EAST, A DISTANCE OF 685.69 FEET, TO THE POINT OF BEGINNING (POB). TOTAL AREA OF THE ABOVE DESCRIBED PARCEL B IS 1,967,380 SQUARE FEET (45.16 ACRES) MORE OR LESS. DISTANCES ARE BASED OFF THE U.S. SURVEY FOOT PER COLORADO NORTH STATE PLANE (NAD83)(GROUND), NORTH ZONE (0501). THE AUTHOR OF THIS DESCRIPTION IS KEVIN J. MARTIN, PLS 38580, PREPARED FOR AND ON BEHALF OF ASCENT GEOMATICS, 8620 WOLFF COURT, WESTMINSTER, COLORADO 80031, ON NOVEMBER 6T", 2024, UNDER JOB NUMBER NOB_240011, AND IS NOT TO BE CONSTRUED AS REPRESENTING A MONUMENTED LAND SURVEY. p,D 0 L. /at, rte C.) ,* ill(* 4-, CC:O • • m 38580 : rr /_ ± • O . // -orat (is) • rZoz� r + a (1 r ••. • � \ • Kevin J. Martin, PLS 38580 Job No.: NOB B240011 For and on Behalf of Ascent Geomatics Solutions Ascent Geomatics - 8620 Wolff Court Westminster, CO 80031 www.ascentgeomatics.com Page 2of3 J NY4 COR. SEC. 2 FND. 3Y4» ALUM. CAP STAMPED: LS 7242 DATED 1993 WCR 74 LOT A RECORDED EXEMPTION NO. O8O3-O2-1-RE1142 REC. NO. 2169382 SW CORNER LOT A, RE -1142 N co r U W () �w o z 0 0 o • SEC. 2 T6N, R65W F;'klll[fl S88°48'18"E 2662.68' N. LINE, NEY4 SEC. 2 NE COR. SEC. 2 FND. 3Y4" ALUM. CAP STAMPED: LS 4392 DATED 1994 /SE CORNER LOT A, RE -1142 PARCEL A S88°48'18"E 465.85' S00°00'00"E 93.54' S89°44'35"E 685.69' -S88°48'18"E 400.00' PARCEL B 1,967,380 S.F. (45.16 ACRES M/L) Soo°00'01 "Err 42.83' w O O N co w 0 O ° 0 POB N89°44'35"W 1111.22' S00°16'24"E S89°59'59'W 539.00' MEMORANDUM OF LEASE REC. NO. 436O281 N 89 °59' 59"E 832.00' S00°00'01 "E 141.00' PARCEL C S90°00'00"E 822.97' 1� S00°16'24"E 293.79' -'er 1 CY4 COR. SEC. 2 FND. 3Y4" ALUM. CAP STAMPED: LS 4392 DATED: 2OO9 0 500' S. LINE NEY4 SEC. 2 COR FND WCR ROW POC 1000' POB GRAPHIC SCALE: 1" = 500' N89°40'00'W 2662.26' LEGEND SECTION (ALIQUOT) LINE QUARTER SECTION LINE PARCEL BOUNDARY LEASE BOUNDARY EXISTING EASEMENT FOUND MONUMENT AS NOTED CORNER FOUND WELD COUNTY ROAD RIGHT-OF-WAY POINT OF COMMENCEMENT POINT OF BEGINNING NOTE: THIS IS NOT A MONUMENTED SURVEY. IT IS INTENDED ONLY TO BE A GRAPHIC DEPICTION OF THE ATTACHED DESCRIPTION. EY4 COR. SEC. 2 FND. 3Y4" ALUM. CAP STAMPED: PLS 38149 DATED 2O17 P° � o /KsN.\ • %..•<C\ ., POC � O N • z 0 E W �Q N CO W W U_ Z w N O O U) Z (I7 - ° J O Q O m (!) W DCP ACCESS EASEMENT REC. NO.436O281 =Y ,71•38580 �: o o : 77-0 -2022 • • J s••••....••••• Kevin J. Martin, PLS 38580 Job No.: NOB_B240011 For and on Behalf of Petroleum Field Services, LLC d.b.a. Ascent Geomatics Solutions PREPARED BY: ASCEND 6EOMATICS SOLUTIONS Ascent Geomatics Solutions 8620 Wolff Court Westminster, CO 80031 (303) 928-7128 NEY4 SECTION 2, TOWNSHIP 6 NORTH, RANGE 65 WEST ALSO KNOWN AS PARCEL #080302000066 BY THE WELD COUNTY ASSESSOR'S OFFICE WELD COUNTY, COLORADO PREPARED FOR: Chevron PARCEL B File Name: TOPSOIL_PARCEL_EXHIBITS Project No. NOB_B240011 Print Date: 11—06-2024 I Sheet: 3 of 3 TETRA TECH WELD COUNTY -USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 15. DEVELOPMENT REVIEW QUESTIONNAIRE 1. Describe the access location and applicable use types (i.e., agricultural, residential, commercial/industrial, and/or oil and gas) of all existing and proposed accesses to the parcel. Include the approximate distance each access is (or will be if proposed) from an intersecting county road. State that no existing access is present or that no new access is proposed, if applicable. The primary access to the proposed new development storage facility (Parcel B) is an existing industrial access road permitted underAP18-00056. It is located approximately 1,400 feet south of WCR 74 and off WCR 47. This access is currently used for the adjacent DCP Midstream compressor station on Parcel C and will be extended internally to serve the new storage yard. No new external access points are proposed, as the existing access is designed to handle the anticipated traffic. The access was approved through a temporary access permit and USR18-0018. Per the permit, the permanent access for the facility was to be moved south approximately 200 feet to align with the Dairy access across the street. Chevron understands that this was never completed per the original DCP USR. Chevron requests keeping the access in the current location as the roadway will meet all design standards required by the Weld County Code. Chevron will work with DCP to meet County requirements. 2. Describe any anticipated change(s) to an existing access, if applicable. The existing industrial access road will be extended internally to the project site to connect the storage yard. No significant modifications to the external access are expected, as it is already permitted for industrial use and can handle the additional traffic generated by this project. If ownership of the newly subdivided parcels should change, an access easement from the adjacent parcels onto the DCP parcel will be negotiated. Based on our assessment, the current access for the site meets the Weld County Code design and spacing requirements for the proposed use. Chevron would like to seek a variance request to keep the access and roadway design as is. If the County requires the access and roadway design to be amended and no options are available for a variance, Chevron will do what is necessary to meet existing approvals and Weld County Code. 3. Describe in detail any existing or proposed access gate including its location. No access gates are proposed off or near County Road 47. An access gate will be installed at the entrance to the storage yard from the adjacent DCP parcel, approximately 1,600 feet west of County Road 47. The gate will include tracking pads to control dust and debris. 4. Describe the location of all existing accesses on adjacent parcels and on parcels located on the opposite side of the road. Include the approximate distance each access is from an intersecting county road. The adjacent parcel to the east (Parcel C), containing DCP Midstream's NorthStar Compressor Station, currently uses the industrial access off WCR 47 that Chevron is requesting to use. This access point is shared between the proposed storage yard and the compressor station, approximately 1,400 feet south of WCR 74. Aerial imagery from the Weld County property portal and the approved and recorded plat for4MUSR21-01- 1282 (Recorded Reception #4770284) show eleven different access points on the east side of County Road 47 associated with the Jonson's Dairy parcel (080301000056). These access locations are listed below. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com Use by Special Review -Development Review Questionnaire December 2, 2024 • Access 1: Residential/Agricultural Access located off the east side of County Road 47, approximately 175 feet south of the intersection with County Road 74. • Access 2: Residential/Agricultural Access located off the east side of County Road 47, approximately 310 feet south of the intersection with County Road 74. • Access 3: Agricultural Access located off the east side of County Road 47, approximately 510 feet south of the intersection with County Road 74. • Access 4: Agricultural Access located off the east side of County Road 47, approximately 710 feet south of the intersection with County Road 74. • Access 5: Agricultural Access located off the east side of County Road 47, approximately 970 feet south of the intersection with County Road 74. • Access 6: Agricultural Access located off the east side of County Road 47, approximately 1,200 feet south of the intersection with County Road 74. • Access 7: Agricultural Access located off the east side of County Road 47, approximately 1,570 feet south of the intersection with County Road 74. • Access 8: Agricultural Access located off the east side of County Road 47, approximately 1,820 feet south of the intersection with County Road 74. • Access 9: Agricultural Access located off the east side of County Road 47, approximately 2,100 feet south of the intersection with County Road 74. • Access 10: Agricultural Access located off the east side of County Road 47, approximately 2,370 feet south of the intersection with County Road 74. • Access 11: Agricultural access located off the east side of County Road 47, approximately 2,620 feet south of the intersection with County Road 74. 5. Describe any difficulties seeing oncoming traffic from an existing access and any anticipated difficulties seeing oncoming traffic from a proposed access. The existing access has no known visibility issues. The road leading to it is relatively flat, providing clear visibility of oncoming traffic in both directions. No sightline obstructions are anticipated for the extended internal road. 6. Describe any horizontal curve (using terms like mild curve, sharp curve, reverse curve, etc.) in the vicinity of an existing or proposed access. The roadway at this existing access location is straight and has no horizontal curvature along the route in either direction. If the access is moved 200 feet to the south, a sharp reverse curve in the access drive is likely and may result in visibility concerns for vehicles exiting the site. 7. Describe the topography (using terms like flat, slight hills, steep hills, etc.) of the road in the vicinity of an existing or proposed access. The topography around the County Road 47 Right-of-way is relatively flat with a slight decrease in elevation as you head directly east from the proposed access. There is no hilly terrain in the vicinity of the access and sight distances are not impacted negatively by the topography. O:\Projects\Longmont\7116\117-7116003\Deliverables\USRApplication\2024-12-02_USRSubmittalPackage\15. USR Development Review Questionnaire.docx TETRA TECH TETRA TECH WELD COUNTY -USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 19. ENVIRONMENTAL HEALTH QUESTIONNAIRE V2 1. Discuss the existing and proposed potable water source. If utilizing a drinking water well, include either the well permit or well permit application that was submitted to the State Division of water Resources. If utilizing a public water tap, include a letter from the Water District, a tap or meter number, or a copy of the water bill. The site is located within the North Weld County Water District; however, there is no existing potable water tap on the property. The proposed use does not require a permanent water tap. The facility is not intended for public use and will have minimal staff (up to 55 people will access the site daily during peak activity: 2 Operators will be on -site full time; 3 Supervisors will visit the site temporarily over each day; up to 20 semi -truck drivers daily; 5 lease operators accessing the regional field office trailer as needed; and u p to 25 field staff to attend monthly team meetings). To meet the water needs of the site, bottled water will be brought and provided by individual employees. 2. Discuss the existing and proposed sewage disposal system. What type of sewage disposal system is on the property? If utilizing an existing on -site wastewater treatment system, provide the on -site wastewater treatment permit number. (If there is no on -site wastewater treatment permit due to the age of the existing on -site wastewater treatment system, apply for an on -site wastewater treatment permit through the Department of Public Health and Environment prior to submitting this application.) If a new on -site wastewater treatment system will be installed, please state "ra new on -site wastewater treatment system is proposed." (Only propose portable toilets if the use is consistent with the Department of Public Health and Environment's portable toilet policy.) There is no existing sewage disposal system on -site. Due to the limited and intermittent presence of e mployees, and the fact that only 2 employees will be on -site full time, a permanent on -site wastewater treatment system is not required. Chevron will contract with a full -service company that will provide the n ecessary quantity of temporary portable toilets and a regular cleaning schedule to accommodate up to 10 employees accessing the site daily, up to 20 semi -truck drivers accessing the site daily, and up to 25 additional temporary workers accessing the facility on a monthly basis. The facilities and schedule will be in place on -site before the new fill storage yard begins operations. All temporary portable toilets will be removed from the site when the yard is not in operation for extended periods. 3. If storage or warehousing is proposed, what type of items will be stored? Clean fill/aggregate and drainage control materials that will be stored on -site, including: • Road base aggregate (Class 5 & 6 road base) • Rip -rap material • Filtrexx (Silt Socks used for sediment control) stored in Conex containers on -site and staged for future projects or for immediate stormwater repair needs • Other various stormwater materials (e.g., erosion control materials and various -sized culverts) needed for future projects and repairs 4. Describe where and how storage and/orstockpile of wastes, chemicals, and/or petroleum will occur on this site. No storage or stockpiles of wastes, chemicals, or petroleum will occur on this site. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com Use by Special Review - Environmental Health Questionnaire December 2, 2024; Revised January 22, 2025 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. There will be no permanent fuel storage tanks on -site. Fuel for operating equipment (such as loaders and bulldozers) will be brought as needed using slip tanks mounted on work trucks. Permanent secondary containment is not required, as there is no on -site fuel storage. 6. If there will be washing of vehicles or equipment on site, indicate how the wash water will be contained. No vehicles or equipment will be washed on site. All heavy equipment and vehicles temporarily stored on - site during operations will be cleaned at an approved off -site location when the facility is not in use. 7. If there will be floor drains, indicate how the fluids will be contained. No floor drains are proposed, as the site does not include permanent structures with plumbing that would require such systems. 8. Indicate if there will be any air emissions (e.g. painting, oil storage, etc.). There will be no significant air emissions. The only potential air quality concern is dust generated by truck traffic and material handling. Dust will be controlled using water trucks, and vehicle speeds on -site will be limited to further reduce dust. See attached Dust Abatement Plan. 9. Provide a design and operations plan if applicable (e.g. composting, landfills, etc.). The application package includes a site plan design for the proposed use, which will be recorded upon review and approval of the USR application and conditions of approval. Any additional operations plan created for the storage yard will be developed in accordance with all conditions of approval and development standards in the approved USR resolution. 10. Provide a nuisance management plan if applicable (e.g. dairies, feedlots, etc.). Although a full nuisance management plan is not required for this project, Chevron recognizes that dust could be the primary nuisance affecting neighboring properties. To address this, Chevron has developed a Dust Abatement Plan, which is included with this submittal. TETRA TECH TETRA TECH IVemo To: Cc: Maxwell Nader, Department of Planning Services, Weld County (mnader@weld.gov) Lauren Light, Environmental Health, Weld County (llight@weld.gov) Mike McRoberts, Development Review, Weld County (mmcroberts@weld.gov) Kyle Myers, Chevron Rockies Business Unit (kyle.myers@chevron.com) From: Date: Subject: Amy Conway, Tetra Tech (amy.conway@tetratech.com) January 22, 2025 Response to Completeness Review Comments, USR for Proposed New Development Storage Facility, PRE24-0270 Dear Mr. Nader: Please find below our responses to the Completeness Review Comments received on 12/30/24, related to the application for Use by Special Review (USR) Application for Proposed New Development Storage Facility, PRE24-0270. Planning Comments: (Contact: Max Nader) Application Incomplete: Do you plan to have lighting on site? Applicant Response: No, we do not plan to have lighting on site. There will be no nighttime operations. Has a new deed been created for lot that this USR will be located on? Applicant Response: Yes, Warranty Deeds are in the process of being filed with Weld County. We've included those documents for your reference. Environmental Health Comments: (Contact: Lauren Light) Application Incomplete: • Please provide a noise study addressing the semi traffic entering and leaving the site. How will the water for dust control be provided? If there are more than 2 employees full time on site, permanent water and sewer is required. Applicant Response: We have included a letter discussing the anticipated noise associated with semi traffic entering and leaving the site, based on the information provided in the Transportation Memo. Water for dust control will be provided via a water truck that makes up to 4 round trips per day to obtain water from off -site. Vendors or contractors will procure the off -site water from nearby sources. Potential water sources will be locations similar to Wagistics or our water source on Wells Ranch. We have updated the Dust Abatement Plan to include this information. There will not be more than 2 full-time employees on site. Per our meeting discussion on 1/15, we have updated the Environmental Questionnaire to clarify the number and types of employees and that "All temporary portable toilets will be removed from the site when the yard is not in operation for extended periods." TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel x-1.303.772.52820 Fax +1.303.772.7039 tetratech.com Response to Completeness Review Comments USR for Proposed New Development Storage Facility, PRE24-0270 January 22, 2025 Development Review Comments: (Contact: Mike McRoberts) Application Complete (with conditions listed below). • DRAINAGE The preliminary drainage report submitted shall be revised using the Modified FAA spreadsheet for sizing the north and south detention ponds. The volumes calculated using the MHFD- Detention, Version 4.06 (July 2022) spreadsheet are less than those required to store the peak 100 - year, 1 -hour stormwater runoff for both ponds. Per Section 5-10.2, of the wCECC manual, a UD-Detention v2.34 spreadsheet containing a Modified FAA worksheet can be downloaded on the weld County Planning and Zoning - Development Review webpage. The report shall use the runoff coefficients provided on the same webpage. Applicant Response: Acknowledged. We are updating the calculations to match the required Modified FAA spreadsheet and will provide a revised preliminary drainage report as soon as possible. Per our meeting discussion on 1/15, we will double-check the tables in the report, the calculations in the appendices, and the grading plans to ensure consistency of information. Please note that upon review the "Developed Drainage Plan" in Appendix A-4 correctly reflect the "Total Pond Storage at Spillway Crest" quantities as shown in Tables 4 and 5 of Section 5.4 -Water Quality and Detention, but it does not show the "Total 100 -Year, 1 -Hour Storm Runoff Volume" quantities as you pointed out in the meeting. Please let us know if you would prefer the information to be labeled or represented differently for ease of review. • TRAFFIC Development Review is accepting the Traffic Narrative submitted by the applicant for Completeness Review. Due to traffic counts provided in the narrative, Development Review is requiring a full Traffic Impact Study meeting the Chapter 8 criteria defined in the wCECC manual. The TIS shall be submitted during the land use process or it will be a Condition of Approval that must be met prior to recording the USR map. Applicant Response: Acknowledged. We will provide the TIS at a future date. As we have more information regarding timing, we will let you know whether we intend to submit the TIS during the land use process or after conditional approval of the USR. Enclosures: 00. Table of Contents_ Revised 1-22-25 19. USR Environmental Health Questionnaire_ Revised 1-22-25 21. Dust Abatement Plan Revised 1-22-25 22. Noise Evaluation Letter 23. Recorded Warranty Deeds TETRA TECH April 15, 2025 Via E -flail Weld County oil and Gas Energy Department Attn: Mr. Brett A. Cavanagh 1402 tit 17th Avenue Greeley, CO 80631 Re: USR25-0003 Emergency Storage for Bishop Site Township 6 North, Range 65 West, 6th P.M. Section 2: NE/4 Also known as. Parcel # 080302100004 by the Weld County Assessor's office. Mr, Cavanagh, Noble Energy, Inc. ("Chevron") is currently working on U R25-003 with Feld County Planning on a Chevron owned property near the intersection of 'SCR 74 and WCR 47 for the use of dirt and facility storage. Chevron is scheduled for a Weld County Planning Commission hearing on May 6th, 2025 and Weld County Commissioner hearing on June 11 t"3 2025. True to the recent. Bishop site incident near WCR 51 and 'SCR ?2# Chevron is respectfully requesting approval to locate an emergency storage area to support ongoing activities at the Bishop location for up to six (6) months on Parcel # 08 0302100004 (USR25-003). If you have any questions, please do not hesitate to contact me at 970-342-0135 or brian.derose@chevron.com Sincerely, By. Name: Brian DeRose Title; Surface Land Manager Preliminary Drainage Report Chevron New Development Storage Facility Tetra Tech Job #117-7116003 February 18, 2025 PRESENTED TO Chevron North America Exploration and Production Company 2115 117th Avenue Greeley, CO 80634 Prepared by: 3/05/2025 Alexander K. Copeland, P.E. Date Project Engineer Reviewed by: 3/04/2025 Fred Charles, PhD, P.E. Senior Engineering Manager PRESENTED BY Tetra Tech 351 Coffman Street Suite 200 Longmont, CO 80501 (303) 772-5282 tetratech . com TABLE OF CONTENTS 1.0 INTRODUCTION 5 2.0 GENERAL LOCATION AND DESCRIPTION 5 2.1 Location 5 2.2 Description of Property 5 3.0 DRAINAGE DESIGN CRITERIA 6 4.0 HISTORIC AND OFF -SITE BASINS 7 4.1 Major Basin Description 7 4.2 Historic Drainage Patterns 7 4.3 Off -site Drainage Patterns 7 4.4 Off -site Drainage Facilities 8 5.0 DRAINAGE FACILITY DESIGN 8 5.1 General Concept 8 5.2 On -site Drainage Basins 8 5.3 On -site Drainage Facilities 9 5.4 Water Quality and Detention 9 5.5 Drainage Infrastructure Maintenance 10 6.0 CONCLUSION 11 7.0 REFERENCES 12 LIST OF TABLES Table 1: Historic Drainage Basin Peak Flow Summary 7 Table 2: Off -site Drainage Basins Peak Flow Summary 7 Table 3: Developed Drainage Basins Peak Flow 9 Table 4: North Detention Pond Summary 10 Table 5: South Detention Pond Summary 10 APPENDICES APPENDIX A —Figures APPENDIX A-1 Vicinity Map APPENDIX A-2 Historic Drainage Plan APPENDIX A-3 Off -Site Drainage Plan APPENDIX A-4 Developed Drainage Plan APPENDIX A-5 Developed Drainage Plan Cross Sections APPENDIX A-6 Detention Pond Details APPENDIX B -Site Data APPENDIX B-1 FEMA Map APPENDIX B-2 Soil Information APPENDIX B-3 Rainfall Data APPENDIX B-4 Historic Runoff Calculations APPENDIX B-5 Off -Site Runoff Calculations APPENDIX B-6 Developed Runoff Calculations TETRA TECH ii March 2025 APPENDIX C Hydraulic Calculations APPENDIX C-1 Pipe and Culvert Calculations APPENDIX C-2 Drainage Channel Calculations APPENDIX C-3 Drainage Calculations APPENDIX C-4 Detention Pond Calculations TETRA TECH iii March 2025 ACRONYMS/ABBREVIATIONS i Acronyms/Abbreviations ac ac -ft Definition Acres Acre -Feet cfs Cubic Feet per Second Chevron Chevron North America Exploration and Production Company DCP DCP Midstream ECB Erosion Control Blanket FAA Federal Aviation Administration FEMA Federal Emergency Management Agency FIRM N OAA ON OS POA Flood Insurance Rate Map National Oceanic and Atmospheric Administration On -Site Off -Site Point of Analysis SEMSWA Southeast Metro Stormwater Authority TRM Turf Reinforcement Mat UDFCD Urban Drainage and Flood Control District USR Use by Special Review WCR Weld County Road WQCV Water Quality Capture Volume TETRA TECH iv March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report 1.0 INTRODUCTION The purpose of this report is to present the proposed storm drainage improvements at the Chevron North America Exploration and Production Company (Chevron) New Development Storage Facility. Typical development of any site will introduce impervious elements to the basin. Impervious material within a basin will increase peak stormwater runoff compared with runoff from existing conditions. This report examines the undeveloped flow patterns of off -site and on -site drainage basins and the proposed stormwater facilities designed to mitigate the downstream impact of increased stormwater runoff. The contents of this report are prepared, at a minimum, following Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3 for a Preliminary Drainage Report. 2.0 GENERAL LOCATION AND DESCRIPTION 2.1 LOCATION The New Development Storage Facility site is located on parcel No. 0803.02.0.00.066 located on the west side of Weld County Road (WCR) 47, with the site access road approximately one -quarter mile south of WCR 74 in Weld County, Colorado. The site is in the northeast 1/4 quarter of Section 2, Township 6 North, Range 65 West of the 6th Principal Meridian, in Weld County. Chevron is in the process of subdividing Parcel No. 0803.02.0.00.066 into three separate parcels, each being a minimum of 35 -acres, via Warranty Deed. The facility will be located entirely on Parcel B. A vicinity map is provided in Appendix A-1 (Figure 1). 2.2 DESCRIPTION OF PROPERTY The New Development Storage Facility will be used as a materials storage yard and field office for oil and gas support services. Chevron is proposing this facility to enhance operational efficiency by reducing transportation distances for materials. Currently, materials required for location builds (e.g., recycled road base, riprap, etc.) are stored at Chevron's LaSalle yard located over 13.5 miles away, off WCR 49 and WCR 46. This new location will reduce the impact to County residents and roads by reducing truck travel and expediting construction in the nearby development areas. The land is currently vacant, non -irrigated agricultural dry rangeland. There are multiple active and inactive oil and gas wells on the site. Historically, the land has been used for agricultural purposes but is not actively farmed at this time. Currently, DCP Midstream (DCP) has existing permitted uses on the original parcel. USR18-0057 is an approved Use by Special Review Permit for a 12 -inch natural gas pipeline route that runs across a portion of the south end of the proposed parcel to the compressor station. USR18-0018 is an approved Use by Special Review Permit for DCP's NorthStar Compressor Station and Subdivision Exemption lot (SUBX18-0001) which was created to permit the special use on -site. The proposed parcel subdivision will create three separate parcels (A, B, and C) of 35 acres or larger via Warranty Deed. The subdivision is designed so that the boundary of the new Parcel C will completely contain the SUBX18-0001 boundary, which surrounds DCP's lease area from Chevron. Therefore, DCP's special use (USR18-0018) will not encumber the project site (Parcel B) or the other new parcel (Parcel A). The site is currently undeveloped, and the proposed land use will be industrial. Existing topography within the parcel is comprised of mild slopes generally draining in an eastern direction. Vegetative cover is comprised of native grasses with no trees. Surrounding land uses include rural residential, agricultural, and oil and gas -related development. in) TETRA TECH 5 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report According to the Custom Soil Resource Report for Weld County, Colorado, Southern Part, the soils that make up the site include Otero sandy loam (hydrologic soil group A) with Nelson fine sandy loam (hydrologic soil group B), with average on -site slopes of approximately 1 to 2 percent based on site topographic data. Detailed soil survey reports are provided in Appendix B-2 (Appendices B-2.1 through B-2.4) for the following respective drainage basins that were used in the hydrologic calculations: ON -1, ON -2, OS -1, and OS -2. 3.0 DRAINAGE DESIGN CRITERIA This report is prepared in compliance with the Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. Within the proposed development, the 100 -year storm is used as the major storm event when evaluating existing and proposed drainage facilities. The 100 -year storm is used because flooding from a storm of this magnitude could cause considerable damage if adequate stormwater controls were not sized for this magnitude of a storm. Previous drainage studies have not been found for this area. This is most likely a result of the site being in a rural environment. Runoff Calculations: Because all the drainage basins for this site are less than 160 acres, the Rational Method was used in stormwater runoff calculations. Time of concentration calculations for individual basins were estimated using the methods detailed within Urban Storm Drainage Criteria Manual, Volume 1, Chapter 6. Runoff calculations are presented in Appendix B-4 through B-6 for historic, off -site, and developed runoff conditions, respectively. Rainfall Data: Site rainfall depth information was obtained from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14, Volume 8, Version 2, Precipitation -Frequency Atlas of the United States (2013) as well as NOAA's Hydrometeorological Design Studies Center's Precipitation Frequency Data Server. Rainfall data are presented in Appendix B-3. Culvert Sizing: Culvert sizes were determined using Bentley CulvertMaster version 10.03.00.03 software. Culvert sizing calculations are provided in Appendix C-1. Drainage Channel Sizing and Erosion Protection: Drainage channels were sized for the 100 -year storm event using Manning's Equation in Bentley FlowMaster version 10.03.00.03. Individual detailed channel calculations are provided in Appendix C-2. Turf Reinforcement Mat (TRM) or Erosion Control Blanket (ECB) is recommended in all drainage channels due to the nature of the on -site soils and erosion potential (moderate to low runoff potential and moderate to high infiltration rates). ROLLMAX VMax SC250 TRM, or approved equal, and North American Green RollMax S150 ECB, or approved equal, are recommended. Riprap will be placed at all culvert outfalls and has been sized according to the Urban Drainage Flood Control District Manual, Volume 2, Chapter 9. A summary of drainage channel calculations, including riprap calculations, is presented in Appendix C-3. Detention Pond Sizing: The detention pond volume was determined using the Urban Drainage and Flood Control District's (UDFCD's) Detention Design — UD-Detention v2.35 spreadsheet, which is based on the Rational Method derived Modified Federal Aviation Administration (FAA) Method. Following Weld County Engineering and Construction Criteria, the pond was designed without considering full spectrum detention. Outflow will be controlled by an orifice plate, a safety -grated 100 -year orifice, a restrictor plate on the outlet pipe, and an emergency overflow weir capable of conveying the 100 -year flow at a depth of 6 inches or less. The detention pond will have no less than one foot of freeboard to the maximum water surface elevation. n Allallif TETRA TECH 6 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report 4.0 HISTORIC AND OFF -SITE BASINS 4.1 MAJOR BASIN DESCRIPTION The proposed property is in rural Weld County and is surrounded by agricultural land, low -density residential, and other oil and gas facilities. The proposed development is in Zone X, an Area of Minimal Flood Hazard. The site is located on Flood Insurance Rate Map (FIRM) Panel No. 08123C1250E (effective date January 20, 2016). An annotated FIRM is presented in Appendix B-1. The site is defined by Weld County as anon -urbanizing area. 4.2 HISTORIC DRAINAGE PATTERNS The project site is located within two historic drainage basins, split across the middle of the site, which have been designated Historic Basin 1 (H-1) and Historic Basin 2 (H-2) (see Figure 2 in Appendix A-2). Runoff within both historic basins flows across the site to the east, with H-1 runoff veering slightly northeast and H-2 runoff veering slightly southeast due to the minor ridge across the middle of the site. Runoff within these basins was analyzed using the Rational Method. The following table provides the peak flow rates for the historic drainage basins that drain to Points of Analysis (POA) A and B. Basin ID H-1 H-2 Table 1: Historic Drainage Basins Peak Flow Summary Area (ac) 5.56 3.22 Peak Flow 10 -Year (cfs) 1.53 1.05 Peak Flow 100 -Year (cfs) 7.05 4.57 The peak 10 -year flow is the allowable release rate for the developed portion of the site. The historic drainage plan is attached to this report as Appendix A-2. 4.3 OFF -SITE DRAINAGE PATTERNS Off -site drainage that drains towards the proposed site is comprised of two basins designated as OS -1 and OS -2 (see Figure 3 in Appendix A-3). Basin OS -1 is the northern off -site basin, while Basin OS -2 is the southern off -site basin. Runoff from Basin OS -1 and OS -2 will be blocked from flowing onto the site by a 4 -foot tall, 4:1 slope perimeter berm on the western edge of the site. Off -site runoff will then flow north (OS -1) and south (OS -2) along the outside of the perimeter berm and then resume the natural easterly flow direction beyond the site. Peak flows for the 10 -year and 100 -year storm events for the off -site drainage basins are provided in the following table. Table 2: Off -site Drainage Basins Peak Flow Summary Basin ID Area (ac) Peak Flow 10 -Year (cfs) Peak Flow 100 -Year (cfs) OS -1 OS -2 55.6 12.4 3.91 2.21 19.72 9.22 n Illliallif TETRA TECH 7 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report The off -site drainage plan is attached to this report as Appendix A-3. 4.4 OFF -SITE DRAINAGE FACILITIES Off -site drainage facilities are not proposed for this location. The western berm will prevent off -site flows from entering the site, and these flows will resume their natural easterly flow direction once they have passed by the edges of the site. 5.0 DRAINAGE FACILITY DESIGN 5.1 GENERAL CONCEPT The site will be graded to maintain the existing drainage basin split that runs across the middle of the site. Compacted road base will be used for the final ground cover where needed to stabilize the site for truck traffic. An imperviousness factor of 40`)/0 was used for this cover, based on recommended values in the Urban Storm Drainage Criteria Manual, Volume 1, Chapter 6. Two double -wide mobile office trailers and two Conex storage containers will be utilized by the on -site employees. These structures are assumed to allow water to flow under them and will not increase the imperviousness of the site. Due to the uncertain nature of the volume and type of stored materials (roadbase, rip -rap, etc.), the imperviousness factor of 40% will be applied to these as well. Piled roadbase would likely store some precipitation, while piled rip -rap would allow some of the precipitation to pass through the void space. Therefore, all graded portions of the site where vehicle traffic and material storage could occur are assumed to have an imperviousness of 40%. The area of the detention ponds is assumed to be 2% impervious per Weld County guidelines. Runoff calculations and assumptions may be found in Appendix B-6. 5.2 ON -SITE DRAINAGE BASINS On -site runoff will be detained in two on -site detention ponds and discharged on the northeast and southeast corners of the site (see Figure 4 in Appendix A-4). The peak runoff for the historic condition was calculated for the two areas that drain to each detention pond (North and South Detention Ponds, respectively) to determine the allowable release rate for the pond. The outflow from each detention pond will not exceed their respective 10 -year historic flow rate; the allowable release rate from each detention pond is the 10 -year historic flow from their respective basins. The total allowable release rate from the North Detention Pond is 1.53 cfs, while the total allowable release rate from the South Detention Pond is 1.05 cfs (see Table 1). The discharge locations from the detention ponds are designed so that the runoff drains away from the downstream compressor station and any access roads. The outflows from the detention ponds will not exceed the allowable release rates. Drainage Basin ON -1 includes the northern portion of the site. Runoff from ON -1 drains into the North Channel which conveys runoff along the northeast side of the site, through Culvert North that conveys flow under the access road, and then into the North Detention Pond. Due to the site's grade, no channel will be constructed inside the northern berm of the site, as minimal flow will be intercepted by the berm. Drainage Basin ON -2 includes the southern portion of the site. Runoff from ON -2 drains through the South Channel and then into the South Detention Pond. Due to the site's grade, no channel will be constructed inside the southern berm of the site, as minimal flow will be intercepted by the berm. The Developed Drainage Plan and Cross Sections are presented in Appendix A-4 and Appendix A-5 (Figures 4 and 5), respectively. The following table provides the peak flow rates for the on -site drainage basins. n Illliallif TETRA TECH 8 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report Table 3: Developed Drainage Basins Peak Flow Basin ID Acres Peak Flow 10 Year (cfs) Peak Flow 100 Year (cfs) Corresponding POA ON -1 ON -2 5.56 3.22 5.38 3.38 5.3 ON -SITE DRAINAGE FACILITIES 14.88 9.45 E F The North Channel conveys flow from ON -1 to Culvert North and ultimately the North Detention Pond. The channel is designed to convey the 100 -year discharge for ON -1 with a minimum of 1 foot of freeboard. The South Channel conveys flow from ON -2 to the South Detention Pond. The channel is designed to convey the 100 -year discharge for ON -2 with a minimum of 1 foot of freeboard. Culvert North conveys flows in the North Channel under the access road located at the northeastern corner of the site. The culvert is designed to convey the 100 -year discharge for Drainage Basin ON -1. Culvert North is proposed to be a 2 -barrel 18 -inch corrugated metal pipe with a slope of approximately 0.5%. The channel and culvert calculations are presented in Appendix C-1, C-2, and the Conveyance Summary in Appendix C-3. 5.4 WATER QUALITY AND DETENTION On -site runoff will be conveyed within drainage ditches and culverts to the on -site detention ponds; detention pond details are presented in Appendix A-6 (Figure 6). The North Detention Pond is designed to detain the total volume of the 100 -year developed storm event for the northern site development, while the South Detention Pond is designed to detain the total volume of the 100 -year developed storm event for the southern site development. A minimum of 1 foot of freeboard will be provided for each detention pond for the 100 -year storm event volume. The required water Quality Capture Volume (WQCV) will be contained within the detention volume for each detention pond. Outflow from the detention pond will discharge through an outlet structure with a water quality treatment plate to slow the drain time of the detention ponds to allow sediment to settle before the water is discharged from the site. The pond outlet structure contains a 12 -inch -diameter outlet pipe. The outlet pipe will be restricted using a metal plate that is attached to the outlet box to cover a portion of the outlet pipe. This restrictor plate is set at a specific elevation to control the release rate of the detention pond. The restrictor plate elevation has been set so that the peak release rate from the site does not exceed the 10 -year historic flow rate following Weld County Engineering and Construction Criteria and Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. Design calculations for the detention pond and outlet pipe are presented in Appendix C-4. Erosion control measures, such as rip -rap, will be provided at the detention pond outlet, the emergency spillway outlet, and the culvert outlet to protect against erosion. The following tables describe the on -site detention ponds. n Illliallif TETRA TECH 9 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report Table 4: North Detention Pond Summary Pond North Drainage Area (acres) 5.56 % Imperviousness of Drainage Area 31 of Concentration (minutes) 14.5 Time 100 -Year, 1 -Hour Storm Runoff Volume (ac -ft) 0.592 Total 100 -Year, Water Surface Elevation (feet) 4,823.46 of Detention Pond Elevation (feet) 4,825.30 Top Release Rate from Pond (cfs) 1.53 Discharge Velocity from Pond (ft/s) 3.67 Total Pond Storage at Spillway Crest (ac -ft) 0.709 Table 5: South Detention Pond Summary 'on• ou Drainage Area (acres) 3.22 Imperviousness of Drainage Area 30 Time of Concentration (minutes) 13.1 Total 100 -Year, 1 -Hour Storm Runoff Volume (ac -ft) 0.323 100 -Year, Water Surface Elevation (feet) 4,824.53 Top of Detention Pond Elevation (feet) 4,827.00 Release Rate from Pond (cfs) 1.05 Discharge Velocity from Pond (ft/s) Total Pond Storage at Spillway Crest (ac -ft) 4.14 0.525 In summary, the two on -site detention ponds are sized to accommodate 100 -year runoff volumes from the newly developed drainage sub -basins. Stormwater discharge from the detention ponds is designed to not exceed the 10 -year historic runoff rate following the specifications provided in the Weld County Engineering and Construction Criteria. Flow restriction plates on each detention pond's discharge pipe will moderate the release rates from the detention ponds to not exceed the 10 -year historic runoff rates. Drain time for each pond was evaluated using the UDFCD detention pond worksheets. Colorado drainage law requires the discharge of 99% of all runoff from all storm events over no more than 120 hours. 5.5 DRAINAGE INFRASTRUCTURE MAINTENANCE Satisfactory operation of on -site drainage components requires scheduled maintenance throughout the life of the site. The following are recommendations for maintenance and inspection that are drawn from the Southeast Metro Stormwater Authority (SEMSWA) in Denver, Colorado. n illlimellif TETRA TECH 10 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report • On -site personnel should be tasked with developing a schedule that reminds them to evaluate all drainage components on -site. o Routinely (monthly) inspect ditches, ponds, culverts, outlet structures, riprap, etc. to ensure locations are free from debris and excess vegetation. o Ensure riprap, culverts, and outlet structures are not compromised. Repair if needed. o Frequency of inspection may need to be more frequent in the first year or two as the site is established. Facilities should be inspected following any storm event. • When mowing, collect clippings and all other trimmings and take them off -site for disposal or dispose of with trash on -site; do not leave in the pond or ditch. • Remove vegetation adjacent to outlet works that may interfere with the operation; note if noxious weeds are present and notify a supervisor to schedule treatment/removal. • During inspection, report damage/compromise to side slopes, pond banks, and outlet structures. Prepare a repair schedule and complete repairs. • It is important to limit the use of fertilizers and pesticides in and around the ponds and ditches to minimize entry into ponds and subsequent downstream waters. • For detention ponds, the accumulated sediment should be removed from the bottom of the outlet structure every 6 months and the pond depths checked at several points. If the thickness of the accumulated sediment is greater than 25 percent of the original design depth, the sediment should be removed. Over time, accumulated sediment will reduce the capacity of the pond and may cause site flooding if not maintained. A typical checklist of questions for operators to answer during inspections is as follows: • Has trash accumulated within the ponds and ditches? • Does vegetative cover compromise the ditch or pond area? • Is there evidence of erosion or instability on pond and ditch slopes? • Is there any sedimentation within the pond, in ditches, and in and around culverts? • Is there any settling and/or cracking of soils in bermed areas? • Are there any upstream or downstream conditions that could impact drainage? Depending on the evaluation, discrepancies should be addressed and fixed as soon as possible. Neglecting repairs may compromise drainage through the site. 6.0 CONCLUSION This report was prepared in compliance with the Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. The proposed drainage system for the improvements to the Irvine Storage Facility site will provide detention for the developed sections of the site, releasing flows from the site at the 10 -year historic rates. Releases are as near to the points of design as practical and are not expected to increase adverse impacts on downstream property owners. This Preliminary Drainage Report is being submitted to Weld County for review and approval. n TETRA TECH 11 March 2025 CHEVRON New Development Storage Facility Preliminary Drainage Report 7.0 REFERENCES Weld County Public Works Department. Weld County Engineering and Construction Criteria. January 2021. Federal Emergency Management Agency, Flood Insurance Rate Map Weld County, CO, Panel 08123C1250E, January 2016. United States Department of Agriculture National Resources Conservation Service. Custom Soil Resource Report for Weld County, Colorado, Southern Part. Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volumes 1-3, January 2021. NOAH Atlas 14, Volume 8, Precipitation -Frequency Atlas of the United States. U.S. Department of Commerce, 2013. TETRA TECH 12 March 2025 APPENDIX A: FIGURES APPENDIX A-1: VICINITY MAP APPENDIX A-2: HISTORIC DRAINAGE PLAN 11/21/2024 2:08:44 PM - C:/USERSIURACE.HARTOMACCD0CSITETRA TECH F E D B A c•} • �C ta:s% 00 0 �o . b } • S f 0%u, 46 i 1 • } a 0 I1 II .\ us) s ss) 1 1 �� o - f �. • .. 1 ) v fi t\ - Lesorr<0\-13 I . „ .. �.. S► ..L./"t 1.- i ) i t 1 I dd o % .) I I � } { rp "ko d NOBLE SUA - 4078008 I { A ''� r APPROX. 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NO. 4279505 • J DEVELOPED DRAINAGE BASIN BOUNDARY DRAINAGE FLOW PATH PROPERTY LINE PARCEL BOUNDARY CHAIN LINK FENCE SECTION LINE EXISTING UTILITY EASEMENT EXISTING CONTOUR EXISTING CONTOUR PROPOSED ACCESS ROAD ACTIVE GAS WELL LOCATION ABANDON GAS WELL LOCATION POINT OF ANALYSIS DRAINAGE FLOW DRAINAGE BASIN NAME 10 YEAR PEAK DISCHARGE 100 YEAR PEAK DISCHARGE DRAINAGE BASIN ACREAGE co o Lu o Lu o >- >- Z < 0 Ci_ < --J.. O < 0 < O < r: 0 Et i- 2 Z 0 i E co '- - Et < Ho 0 E zz 0 z 0 Do ,_, z, co_ LEO i ,_ a < f: > 0 0 _I 0 0_ > >al Bar Measures 1 inch, otherwise drawing not to scale APPENDIX A-5: DEVELOPED DRAINAGE PLAN CROSS SECTIONS APPENDIX A-6: DETENTION POND DETAILS APPENDIX B: SITE DATA APPENDIX B-1: FEMA MAP APPENDIX B-2: SOIL INFORMATION APPENDIX B-2.1: SOIL INFORMATION: ON -1 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 27, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 51 Otero sandy loam, 1 to 3 percent slopes 14 References 16 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 3.1 56.3% 51 Otero sandy loam, percent slopes 1 to 3 2.4 43.7% Totals for Area of Interest 5.6 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, 11 Custom Soil Resource Report onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 16 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 17 APPENDIX B-2.2: SOIL INFORMATION: ON -2 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 27, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 51 Otero sandy loam, 1 to 3 percent slopes 14 References 16 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 40° 31' 2" N c c�v S3 40° 30' 56" N 4 M O 531420 531440 531460 Custom Soil Resource Report Soil Map Soil Map may not he valid at this scale. 531420 531440 531460 531480 531500 531520 531540 Map Scale: 1:899 if printed on A portrait (8.5" x 11") sheet. 0 10 20 40 531480 Meters 60 531500 Feet 0 40 80 160 240 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: L TM Zone 13N WGS84 531520 531540 104° 37' 39 W 40° 31 2 N 40° 30' 56" N 9 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 2.6 79.4% 51 Otero sandy loam, percent slopes 1 to 3 0.7 20.6% Totals for Area of Interest 3.2 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, 11 Custom Soil Resource Report onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 16 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 17 APPENDIX B-2.3: SOIL INFORMATION: OS -1 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 26, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 37 Nelson fine sandy loam, 0 to 3 percent slopes 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 14 47 Olney fine sandy loam, 1 to 3 percent slopes 15 51 Otero sandy loam, 1 to 3 percent slopes 16 References 18 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 40° 31' 23" N 40° 30' 58" N 530600 530700 530800 530900 Map Scale: 1:5,370 if printed on A landscape (11" x 8.5") sheet Meters 0 50 100 200 300 Custom Soil Resource Report Soil Map 531000 Feet 0 250 500 1000 1500 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTT/1 Zone 13N WGS84 531100 9 531200 531600 104° 37' 33" W 104° 37' 33" '101 40° 31' 23" N 40° 30' 58" N Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 37 Nelson fine sandy percent slopes loam, 0 to 3 1.5 2.6% 38 Nelson fine sandy percent slopes loam, 3 to 9 9.7 17.4% 47 Olney fine sandy percent slopes loam, 1 to 3 4.5 8.1°/0 51 Otero sandy loam, percent slopes 1 to 3 40.0 71.9% Totals for Area of Interest 55.6 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. 11 Custom Soil Resource Report The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 37 Nelson fine sandy loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 362h Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of statewide importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Olney Percent of map unit: 5 percent Hydric soil rating: No 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H? - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No Terry Percent of map unit: 5 percent Hydric soil rating: No 47 Olney fine sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 362v Elevation: 4,600 to 5,200 feet Mean annual precipitation: 11 to 15 inches Mean annual air temperature: 46 to 54 degrees F Frost -free period: 125 to 175 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Olney and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Olney Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Mixed deposit outwash Typical profile H1 - 0 to 10 inches: fine sandy loam H2 - 10 to 20 inches: sandy clay loam H3 - 20 to 25 inches: sandy clay loam H4 - 25 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Custom Soil Resource Report Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.0 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4c Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Zigweid Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Custom Soil Resource Report Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, D to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 18 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 19 APPENDIX B-2.4: SOIL INFORMATION: OS -2 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 26, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 47 Olney fine sandy loam, 1 to 3 percent slopes 14 51 Otero sandy loam, 1 to 3 percent slopes 15 References 17 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 6.7 53.6% 47 Olney fine sandy percent slopes loam, 1 to 3 5.2 41.6% 51 Otero sandy loam, percent slopes 1 to 3 0.6 4.8% Totals for Area of Interest 12.4 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or 11 Custom Soil Resource Report landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 47 Olney fine sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 362v Elevation: 4,600 to 5,200 feet Mean annual precipitation: 11 to 15 inches Mean annual air temperature: 46 to 54 degrees F Frost -free period: 125 to 175 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Olney and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Olney Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Mixed deposit outwash Typical profile H1 - 0 to 10 inches: fine sandy loam H2 - 10 to 20 inches: sandy clay loam H3 - 20 to 25 inches: sandy clay loam H4 - 25 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.0 inches) Interpretive groups Land capability classification (irrigated): 3e Custom Soil Resource Report Land capability classification (nonirrigated): 4c Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Zigweid Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Custom Soil Resource Report Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 16 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 17 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 18 APPENDIX B-3: RAINFALL DATA NOAA Atlas 14, Volume 8, Version 2 Location name: Eaton, Colorado, USA* Latitude: 40.5179°, Longitude: -104.6263° Elevation: 4816 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches}1 Average recurrence interval - (years) Duration 1 2 5 10 25 50 100 J 200 500 1000 5 -min 0.242 (0.198-0.2991 0.293 (0.239-0.362) 0.390 (0.316-0.482) 0.482 (0.388-0.598) 0.626 (0.492-0.828) 0.752 (0.570-1.00) 0.889 (0.646-1.22) 1.04 (0.718-1.46) 1.26 (0.830-1.82) 1.44 (0.914-2.10) 10 I -min 00.355 (0.290-0.437) 0.430 (0.350-0.530) 0.571 (0.463-0.706) 0.705 (0.568-0.876) 0.917 1.10 (0.834-1.47) 1.30 (0.945-1.78) 1.52 (1.05-2.14) 2.12 (1.34-3.07) 15 -min 1 p 0.524 (0.427-0.646) 0.696 (0.565-0.861) 0.860 (0.693-1.07) 1.12 (0.878-1.48) 1.34 (1.02-1.79) 1.59 (1.15-2.17) 1.86 (1.28-2.61) 2.26 (1.48-3.26) 2.58 (1.63-3.74) 30 -min I 00.586 (0.478-0.722), 0.708 (0.577-0.873) 0.939 (0.762-1.16) 1.16 (0.935-1.44) 1 1.51 (1.19-2.00) 1.82 (1.38-2.42) 2.15 (1.56-2.94) 2.52 (1.74-3.55) 3.06 (2.01-4.42) 3.51 (2.22-5.09) 60 -min 0.728 (0.594-0.897) 0.871 (0.710-1.07) 1.15 (0.934-1.42) 1.43 (1.15-1.77) 1.87 ` (1.48-2.49) 2.27 (1.72-3.04) 2.71 (1.97-3.72) 3.20 (2.21-4.51) 3.92 I (2.58-5.67) 4.52 (2.86-6.55) 2 -hr 0.871 (0.715-1.06) 1.04 (0.849-1.26) 1.36 (1.12-1.67) I 1.70 (1.38-2.09) 2.24 (1.78-2.96) 2.72 (2.09-3.62) 3.26 (2.40-4.45) 3.88 (2.70-5.42) 4.78 (3.18-6.86) 5.53 (3.54-7.95) 3 -hr 0.951 [(0.785-1.16) 1.12 (0.924-1.36) 1.47 (1.21-1.80) 1.83 (1.49-2.24) 2.42 (1.94-3.20) 2.95 (2.28-3.92) 3.56 (2.63-4.83) 5.25 (3.52-7.51) 6.10 (3.92-8.72) 6-h r 1.08 (0.896-1.30) 1.29 (1.07-1.56) 1.71 (1.41-2.07) 2.12 (1.74-2.57) 2.77 (2.22-3.60) 3.34 (2.59-4.37) 3.98 (2.96-5.34) 4.69 (3.32-6.46) r 5.73 (3.87-8.10) 6.59 (4.29-9.34) 12-h r 1.26 (1.05-1.50) 1.51 (1.26-1.81) 1.97 (1.64-2.37) 2.41 (1.99-2.90) 3.08 (2.48-3.94) 3.66 (2.86-4.72) 4.29 (3.21-5.67) 4.98 (3.55-6.77)i 5.98 (4.07-8.35) 6.80 (4.46-9.54) 24 -hr 1.50 (1.27-1.78) 1.76 (1.48-2.09) 2.24 (1.88-2.66) 2.68 (2.24-3.20) 3.37 (2.74-4.26) 3.96 (3.12-5.05) 4.60 (3.48-6.02) 5.31 (3.82-7.14) 6.32 (4.35-8.74) 7.16 (4.75-9.95) 2 -day 1.73 (1.47-2.04) 2.03 1 (1.72-2.38) 2.55 (2.16-3.01) 3.02 i (2.54-3.59) 3.74 (3.05-4.65) 4.34 (3.43-5.46) 4.98 (3.79-6.42) 5.67 (4.11-7.52) 6.65 i (4.61-9.07) 7.44 (4.99-10.2) 3 -day 1.90 (1.62-2.22) 2.20 (1.87-2.57) 2.72 (2.31-3.19) 3.20 (2.70-3.77) 3.92 (3.21-4.85) 4.52 (3.60-5.66) 5.17 (3.95-6.63) i 5.86 (4.28-7.74) 6.86 (4.79-9.30) 7.65 (5.17-10.5) -day 24 I.03 (1.74-2.36)I. 2.33 2.87 (2.45-3.36) 3.36 (2.84-3.95) 4.09 (3.36-5.03) 4.69 (3.75-5.84) 6.04 (4.42-7.93) 7.03 (4.93-9.49) 7.82 (5.30-10.7) 7 -day 2.29 (1.97-2.65) 2.67 I (2.30-3.09) 3.31 (2.84-3.84) 3.86 ! (3.28-4.50) 4.64 1 (3.81-5.61) 5.26 (4.21-6.46) 5.90 (4.55-7.43) 6.57 (4.83-8.51) 7.48 1 (5.27-9.98) 8.19 (5.61-11.1) 10 -day 2.52 1(2.18-2.91) 2.96 (2.56-3.41) 3.68 (3.16-4.25) 4.27 (3.65-4.96) 5.73 (4.60-6.97) 6.36 (4.92-7.95) 7.01 (5.18-9.01) i 8.53 (5.87-11.5) 20-da y 3.25 (2.83-3.71) 3.76 (3.27-4.30) 4.58 (3.97-5.25) 5.25 (4.53-6.04) 6.15 (5.09-7.28) 6.83 (5.52-8.21) 7,49 (5.84-9.24 8.15 (6.07-10.3) 9.00 (6.43-11.8) 9.63 (6.70-12.8) 30 -day 3.83 (3.36-4.35) 4.40 (3.85-5.00) 5.31 (4.62-6.05) 6.04 (5.23-6.92) 7.01 (5.83-8.24) 7.74 (6.29-9.24) 8.44 (6.61-10.3) 9.14 (6.84-11.5) 10.0 (7.20-13.0) 10.7 (7.47-14.1) 45 -day 4.54 (3.99-5.13) 5.20 (4.57-5.88) 6.24 (5.47-7.08) 7.08 A (6.16-8.06) 1 8.17 ` (6.82-9.53) 8.98 (7.33-10.6) _ 9.75 (7.67-11.9) 10.5 I7.90-13.1) (ll 11.4 (8.25-14.7) 12.1 (8.52-15.9) -day I.10 560 (4.50-5.74) 77 7.07 8.01 (6.99-9.09) 10.9 (8.64-13.2) 11.7 (8.86-14.6) 13.4 (9.47-17.5) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical PADS -based depth -duration -frequency (DDF) (curves Latitude. 40.5179c Longitude: -104.6263° 14 12 10 0 12 ro rti �ru] 'flfif N ("LI +4' >-. >-. p 1}>rID ,q1 ,d1 {1� 1 1 �. i 0 SD uni 0 IN en 71- NOAA Atlas 140Volume 8, Version 2 .10 25 50 100 200 500 1000 Average recurrence interval (years) Created (GrL1TP. Thu Sep 14 2.: 4.1:16 Back to Top Maps & aerials Small scale terrain 1, -1 g: u G J Average recurrence interval (years) S 1 2 5 10 — 25 50 - 100 - 200 0Q I 000 Duration Lion i min 1 in 15 -min 30 -min e2-nr Y • 7r 6-tIr 12 -hr 24 -hr l 2Sy .: 3 -day 4 -day 1 -day de 14 -,day — 20 -day 30 -day — 46 -day 60 -day Large scale terrain r=: •Z; Long �J r rat oIX; 12. 2-P444Z Tits FortCollins • /O45 Longmont B.:wider cneyenne ■ ■rte # ree I ey 100km 60mi - -' ,Denver Large scale map a Fort Cpli n s I Finley 7, Longmont Boulder ,ite s 100km Fir �l 60mi Large scale aerial Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer APPENDIX B-4: HISTORIC RUNOFF CALCULATIONS Irvine Storage Facility Historic Runoff Calculations Basin Basin Area (acres) Basin Imperviousness Runoff Coeficients, c Ltotal Li Si Sw Ti Tt Tc Rainfall Intensity I (in/hr) Basin Flows Q (cfs) POA Area Soil Type A Soil Type B I Soil Type C Soil Type D Road Base (ac) Roof/Structure (ac) Undeveloped (ac) I % 2 Yr 5 Yr 10 Yr 100 Yr (ft) (ft) (ft/ft) (ft/ft) (min) (min) (min) 2 Yr 5 Yr 10 Yr 100 Yr 2 Yr 5 Yr 10 Yr 100 Yr H-1 5.56 2 53 3 03 0.00 0.00 0.00 0.00 5 56 2.0 0.007 0.044 0.122 0.296 351 351 0.018 0.018 29.7 0.0 29.7 1.37 1.82 2.26 4.28 0.05 0.45 1.53 7.05 A H-2 3.22 0.72 2.50 0.00 0.00 0.00 0.00 3.22 2.0 0.008 0.063 0.144 0.330 389 389 0.020 0.020 29.4 0.0 29.4 1.38 1.83 2.27 4.31 0.04 0.37 1.05 4.57 B Basin H-1 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A Soil Type B Soil Type C Soil Type D Composite: 2.53 3.03 0.00 0.00 45.5% 54.5% 0 0% 0 0% 5.56 100% 0.005 0.009 0.010 0.010 0.007 0.000 0.082 0.163 0.163 0.044 0.069 0.165 0.262 0.262 0.122 .217 0.362 0.507 0.507 0.296 Basin H-2 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A Soil Type B Soil Type C Soil Type D Composite: 0.72 2.50 0.00 0.00 22.3% 77.7% 0.0% 0.0% 3.22 100% 0.005 0.009 0.010 0.010 0.008 0.000 0.082 0.163 0.163 0.063 0.069 0.165 0.262 0.262 0.144 0.217 0.362 0.507 0.507 0.330 Site Imperviousness Table I ldeveloped 2 1 Undeveloped 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr 100 Yr P1 0.87 1.15 1.43 2.71 Notes: 1 Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2 Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C 3. H-1 and H-2 areas and soil types are based on the outputs from the NRCS Web Soil Survey and vary slightly from the calculated areas due to rounding. Equations: Tt=Ti+Tt Ti = (0.395*(1.1-05)*Li^0.5) / Si^0.33 C5 = 5 Yr Runoff Coefficient Li = 500 ft maximum Si = average watercourse slope I = (28.5*P 1) / (10+Tc)^0.786 P1 = 1 -hr point rainfall depth Tc = time of conentraction Tt = (Lt -500) / V V = Cv*S^0.5 Cv = Conveyance Coefficient =5, tillage, field (Table RO-2) Sw = average watercourse slope Q = C*I*A C =Runoff Coefficient I =Rainfall Intensity A = Area \\tt.local\IRR\Prolects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.x1s APPENDIX B-5: OFF -SITE RUNOFF CALCULATIONS Irvine Storage Facility Offsite Runoff Calculations Basin Basin Area (acres) Basin Imperviousness Runoff Coeficients, c Ltotal Li Si Sw Ti Tt Tc Rainfall Intensity I (in/hr) Basin Flows Q (cfs) POA Area Soil Type A Soil Type B Soil Type C Soil Type D Gravel Road (ac) Roof/Tank (ac) Undeveloped (ac) I % 2 Yr 5 Yr 10 Yr 100 Yr (ft) (ft) (ft/ft) (ft/ft) (min) (min) (min) 2 Yr 5 Yr 10 Yr 100 Yr 2 Yr 5 Yr 10 Yr 100 Yr OS -1 55.60 39.40 16.30 0.00 0.00 0.00 0.00 55.60 2.0 0.006 0.024 0.097 0.260 3746 500 0.006 0.010 51.42 108.20 159.62 0.44 0.58 0.72 1.37 0.15 0.77 3.91 19.72 C OS -2 12.40 0.50 11.90 0.00 0.00 0.00 0.00 12.40 2.0 0.009 0.078 0.162 0.356 2443 500 0.014 0.016 36.91 52.02 88.94 0.67 0.89 1.10 2.09 0.07 0.86 2.21 9.22 D Basin OS -1 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A 39.40 70.7% 0.01 0.000 0.069 0.217 Soil Type B 16.30 29.3% 0.01 0.082 0.165 0.362 Soil Type C 0.00 0.0% 0.01 0.163 0.262 0.507 Soil Type D 0.00 0.0% 0.01 0.163 0.262 0.507 55.70 100% Modified: 0.006 0.024 0.097 0.260 Basin OS -2 2 yr 5 yr 10 yr 100 yr % Impervious 2.0 Soil Type A 0.50 4.0% 0.01 0.000 0.069 0.217 Soil Type B 11.90 96.0% 0.01 0.082 0.165 0.362 Soil Type C 0.00 0.0% 0.01 0.163 0.262 0.507 Soil Type D 0.00 0.0% 0.01 0.163 0.262 0.507 12.40 100% Modified: 0.009 0.078 0.162 0.356 3.91 Site Imperviousness Table Undeveloped 2 i 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr 100 Yr I P1 I 0.87 I 1.15 I 1.43 2.71 Notes: 1. Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2. Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C 3. OS -1 and OS -2 areas and soil types are based on the outputs from the NRCS Web Soil Survey and vary slightly from the calculated areas due to rounding. Equations: Tt = Ti + Tt Ti = (0.395*(1.1-05)*Li^0.5) / Si^0.33 C5 = 5 Yr Runoff Coefficient L = 500 ft. maximum Si = average watercourse slope Tt = (Ltotal-500) / V V = Cv*S^0.5 Cv = Conveyance Coefficient (Table RO-2) Sw = average watercourse slope I = (28.5*P1) / (10+Tc)^0.786 Q = C*I*A P1 = 1 -hr point rainfall depth Tc = time of conentraction C = Runoff Coefficient I = Rainfall Intensity A=Area \\tt.local\IER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.x1s APPENDIX B-6: DEVELOPED RUNOFF CALCULATIONS Irvine Storage Facility Developed Runoff Calculations Basin Area Soil Type A Yp Basin Area (acres) Soil Type B yp Soil Type C yp Soil Type D yp Road Base ac ( ) Basin Imperviousness Undeveloped/Pond ed/Pond ac p ( ) I % Runoff Coeficients, c 2 Yr 5 Yr 10 Yr 100 Yr Ltotal ( ft Tc 111111 ) ( ) 2 yr Rainfall Intensity I (in/hr) 10 Yr 100 Yr 2 Yr Basin Flows Q (cfs) 5 Yr 10 Yr 100 Yr P A O Roof/Tank ac ( ) 5 Yr ON -1 5.56 2.53 3.03 0.00 0.00 4.28 0.00 1.28 31 0.200 0.228 0.293 0.428 806 14.5 2.01 2.65 3.30 6.26 2.23 3.37 5.38 14.88 E ON -2 3.22 0.72 2.50 0.00 0.00 2.36 0.00 0.86 30 0.199 0.236 0.303 0.448 551 13.1 2.10 2.78 3.46 6.56 1.35 2.11 3.38 9.45 F Site Imperviousness Table Asphalt Roof/Tank Road Base Undeveloped/Pond 100 90 40 2 ION % Impervious -1 31 2 yr .5 yr 10 yr 100 ,yr Soil Type A 2.53 45.5% 0.183 0.198 0.259 0.375 Soil Type B 3.03 54.5% 0.214 0.253 0.322 0.472 Soil 0.00 0.0% 0.223 0.309 0.384 0.569 Type C Soil Type D 0.00 0.0% 0.223 0.309 0.384 0.569 5.56 100% Modified: 0.200 0.228 0.293 0.428 -2 2 yr 5 yr 10 yr 100 yr ION % Impervious 30 Soil Type A 0.72 22.3% 0.175 0.192 0.254 0.371 Soil Type B 2.50 77.7% 0.206 0.248 0.317 0.469 Soil Type C 0.00 0.0% 0.215 0.305 0.381 0.568 Soil Type D 0.00 0.0% 0.215 0.305 0.381 0.568 3.22 100% Modified: 0.199 0.236 0.303 0.448 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr P1 0.87 1.15 1.43 100 Yr I 2.71 Notes: 1. Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2. Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C Equations: Tc = L/180+10 I = (28.5 *P 1) / (10+Tc)^0.786 P1 = 1 -hr point rainfall depth Tc = time of conentraction Q = C*I*A C = Runoff Coefficient I = Rainfall Intensity A = Area \\tt.local\IER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.11s APPENDIX C: HYDRAULIC CALCULATIONS APPENDIX C-1: PIPE AND CULVERT CALCULATIONS Culvert Calculator Report North Channel Culvert Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 4,824.17 ft 4,824.27 ft 4,823.77 ft 4,824.27 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 1.40 14.88 cfs 4,823.04 ft Outlet Control Grades Upstream Invert Length 4,822.17 ft 43.00 ft Downstream Invert Constructed Slope 4,821.96 ft 0.005000 ft/ft Hydraulic Profile Profile CompositeM2PressureProfile Slope Type Flow Regime Velocity Downstream Mild Subcritical 5.46 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 1.08 ft N/A ft 1.06 ft 0.023997 ft/ft Section Section Shape Section Material Section Size Number Sections Circular CMP 18 inch 2 Mannings Coefficient Span Rise 0.024 1.50 ft 1.50 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,824.27 ft 0.20 Upstream Velocity Head Entrance Loss 0.28 ft 0.06 ft Inlet Control Properties Inlet Control HW Elev. 4,823.77 ft Inlet Tpeled ring, 33.7° (1.5:1) bevels K 0.00180 M 2.50000 C 0.02430 Y 0.83000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 3.5 ft2 3 B 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 09:45:1 SNBNentley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Culvert Calculator Report North Pond Outlet Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 0.00 ft 4,821.55 ft 4,821.49 ft 4,821.55 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 0.83 1.53 cfs 0.00 ft Outlet Control Grades Upstream Invert Length 4,820.72 ft 43.20 ft Downstream Invert Constructed Slope 4,820.50 ft 0.005000 ft/ft Hydraulic Profile Profile Slope Type Flow Regime Velocity Downstream M2 Mild Subcritical 3.67 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 0.52 ft 0.56 ft 0.52 ft 0.006279 ft/ft Section Section Shape Section Material Section Size Number Sections Circular Concrete 12 inch 1 Mannings Coefficient Span Rise 0.013 1.00 ft 1.00 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,821.55 ft 0.50 Upstream Velocity Head Entrance Loss 0.18 ft 0.09 ft Inlet Control Properties Inlet Control HW Elev. 4,821.49 ft Inlet Type Square edge w/headwall K 0.00980 M 2.00000 C 0.03980 Y 0.67000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 0.8 ft2 1 1 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 10:07:4WkB\entley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Culvert Calculator Report South Pond Outlet Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 0.00 ft 4,823.17 ft 4,823.10 ft 4,823.17 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 0.68 1.05 cfs 0.00 ft Entrance Control Grades Upstream Invert Length 4,822.49 ft 43.00 ft Downstream Invert Constructed Slope 4,822.00 ft 0.011419 ft/ft Hydraulic Profile Profile Slope Type Flow Regime Velocity Downstream S2 Steep Supercritical 4.14 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 0.36 ft 0.36 ft 0.43 ft 0.005835 ft/ft Section Section Shape Section Material Section Size Number Sections Circular Concrete 12 inch 1 Mannings Coefficient Span Rise 0.013 1.00 ft 1.00 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,823.17 ft 0.50 Upstream Velocity Head Entrance Loss 0.16 ft 0.08 ft Inlet Control Properties Inlet Control HW Elev. 4,823.10 ft Inlet Type Square edge w/headwall K 0.00980 M 2.00000 C 0.03980 Y 0.67000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 0.8 ft2 1 1 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 10:21:1 1JABentley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 APPENDIX C-2: DRAINAGE CHANNEL CALCULATIONS Worksheet for North Trapezoidal Channe1111524 -1 Project Description Friction Method Solve For Manning Formula Normal Depth Input Data Roughness Coefficient Channel Slope Left Side Slope Right Side Slope Bottom Width Discharge 0.035 0.005 ft/ft 4.000 H :V 4.000 H :V 2.00 ft 14.88 cfs Results Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type 12.9 in 6.8 ft2 10.9 ft 7.5 in 10.61 ft 9.1 in 0.024 ft/ft 2.19 ft/s 0.07 ft 1.15 ft 0.483 Subcritical GVF Input Data Downstream Depth Length Number Of Steps 0.0 in 0.0 ft 0 GVF Output Data Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope 0.0 in N/A 0.00 ft 0.00 ft/s 0.00 ft/s 12.9 in 9.1 in 0.005 ft/ft 0.024 ft/ft Ditches.fm8 11/15/2024 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 FlowMaster [10.03.00.03] Page 1 of 1 Worksheet for South Trapezoidal Channe1111524 - 1 Project Description Friction Method Solve For Manning Formula Normal Depth Input Data Roughness Coefficient Channel Slope Left Side Slope Right Side Slope Bottom Width Discharge 0.035 0.005 ft/ft 4.000 H : V 4.000 H : V 2.00 ft 9.45 cfs Results Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type 10.5 in 4.8 ft2 9.2 ft 6.3 in 9.03 ft 7.2 in 0.025 ft/ft 1.95 ft/s 0.06 ft 0.94 ft 0.470 Su bcrit ical GVF Input Data Downstream Depth Length Number Of Steps 0.0 in 0.0 ft 0 GVF Output Data Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope 0.0 in N/A 0.00 ft 0.00 ft/s 0.00 ft/s 10.5 in 7.2 in 0.005 ft/ft 0.025 ft/ft Ditches.fm8 11/15/2024 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 FlowMaster [10.03.00.03] Page 1 of 1 APPENDIX C-3: DRAINAGE CALCULATIONS Irvine Storage Facility Culvert Runoff Calculations CULVERT ID Contributing Basins 10-,yr (cfs) 100-yr (cfs) � EL: Inv. In Inv. Out Velocityloo (ft/s) Pipe Dia. (in) ON -1 5.38 14.88 4824.27 4822.17 4821.96 5.46 18 NORTH CHANNEL CULVERTS NORTH POND OUTLET ON -1 -- 1.53 NA 4820.72 4820.50 3.67 12 ON -2 -- 1.05 NA 4822.49 4822.00 4.14 12 SOUTH POND OUTLET Riprap Apron Calculations at Culvert Outlets STRUCTURE ID Pipe (ft) O, D Discharge per Barrel, Qmo (cfs) Tailwater Allowable Type of Rip Rap Depth Expansion Factor Length of Rip Rap Check Width * 2 d50 (in) 2 s Q/D 1/(2*tan8) ( Fi re 9-35) At (ft' ) Length (ft) * ,� 3 D (Min.) 10*D (Max) Use 8 T (Radians) (ft) , Yt/D 15 Q/D Rip Rap (Figure 9-3 8 ( ) cis() Equation g_ 11 (in) Use (in) ., Depth, p (ft) Yt Velocity, V ty, (ft/sec) (ft) (ft) (ft) 1.5 7.44 1.08 3.00 0.72 4.05 TYPE L 2 9 18 2.7 6.7 2.5 5.4 4.5 15 10 Extend to Height of Pipe NORTH CHANNEL CULVERTS NORTH POND OUTLET 1 1.5 3 0.5 2 = 3.00 0.5 2 = 1.5 3 TYPE L * * 1 9 18 1.5 6.7 0.5 -0.1 3 10 6 0.074 2 SOUTH POND OUTLET - 1 1.05 0.34 _ 3.00 0.34 1.05 TYPE L** 1 9 18 1.1 6.2 .. 0.4 0.2 3 10 6 0.080 2 L** - Use Type L for a Distance of 3*D Downstream, Urban Drainage, Drainage Criteria Manual, Volume 1, Figure MD -21, No Further Calculations Required Ditch Calculations Contributing Basins .. 10-yr 100-yr (cfs) (cfs) _ Type _ Side Slopes Channel Slope Depth 1 of Flow (ft) Req'd Freeboard Depth (ft) + Planned Min. Depth 1 (ft) Velocity (ft/s) ` ... Roughness g Coefficient Froude # Hydr. Radius (ft) Shear (psi) Erosion Control Ditch ID NORTH CHANNEL ON -1 5.38 14.88 Trapezoidal Ditch, 2' Bottom Width 4:1 0.5% _ 1.075 2.075 3 2.19 0.035 0.483 0.625 _ 0.20 TRM/VEG SOUTH CHANNEL ON -2 3.38 9.45 Trapezoidal Ditch, 2' Bottom Width 4:1 0.5% 0.875 1.875 3 1.95 0.035 0.470 0.525 0.16 TRM/VEG Spillway Calculations STRUCTURE ID Contributing Basins 100-,yr (cfs) Weir Coefficient _ CBcw Side Slopes Flow Depth (ft) Minimum Length Length to Use (Eq 5.10.2.3, ft) _ (ft) NORTH POND _ ON _ -1 14.88 3 4.1 0.5 14.03 15 SOUTH POND ON -2 9.45 3 4:1 0.5 8.91 10 \\tt.local\TER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWeldC111524.x1s APPENDIX C-4: DETENTION POND CALCULATIONS DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Chevron Irvine Storage Facility Basin ID: North Pond (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) Determination of MINOR Detention Volume Using Modified FAA Method Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input): Catchment Drainage Imperviousness Catchment Drainage Area Predevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rate One -hour Precipitation Design Rainfall IDF Formula i = Ci* Pi/(C2+TJAC3 Coefficient One Coefficient Two Coefficient Three la = A= Type = T= Tc = q= Pi _ Ci _ C2 = C3 = 31.00 5.560 B 10 15 0.28 1.43 28.50 10 0.789 percent acres A, B, C, or D years (2, 5, 10, 25, 50, or 100) minutes cfs/acre inches Determination of Average Outflow from the Basin (Calculated): cfs cfs cubic acre -ft for 5 -Minutes) feet Runoff Coefficient Inflow Peak Runoff Allowable Peak Outflow Enter Rate Rainfall Mod. Mod. FAA Minor Storage FAA Minor Storage Duration Incremental Qp-out Volume Volume Increase Qp-in C = = = = = Value 0.32 5.81 1.53 5,730 0.132 5 <- Here (e.g. 5 Rainfall Duration minutes (input) Rainfall Intensity inches (output) / hr Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0 0.00 0.000 0.00 0.00 0.000 0.000 5 4.81 0.059 1.00 1.53 0.011 0.048 10 3.83 0.094 1.00 1.53 0.021 0.073 15 3.22 0.118 0.98 1.50 0.031 0.087 20 2.78 0.136 0.86 1.32 0.036 0.100 25 2.47 0.151 0.79 1.21 0.042 0.109 30 2.22 0.163 0.74 1.13 0.047 0.116 35 2.02 0.173 0.71 1.08 0.052 0.121 40 1.86 0.182 0.68 1.04 0.057 0.125 45 1.73 0.190 0.66 1.01 0.063 0.128 50 1.61 0.197 0.65 0.99 0.068 0.130 55 1.51 0.204 0.63 0.97 0.073 0.131 60 1.43 0.210 0.62 0.95 0.078 0.131 65 1.35 0.215 0.61 0.94 0.084 0.132 70 1.28 0.220 0.60 0.92 0.089 0.131 75 1.22 0.225 0.60 0.91 0.094 0.131 80 1.17 0.229 0.59 0.90 0.100 0.130 85 1.`12 0.234 0.59 0.89 0.105 0.129 90 1.08 0.238 0.58 0.89 0.110 0.127 95 1.04 0.241 0.58 0.88 0.115 0.126 100 1.00 0.245 0.57 0.88 0.121 0.124 105 0.96 0.248 0.57 0.87 0.126 0.122 110 0.93 0.251 0.57 0.87 0.131 0.120 115 0.90 0.255 0.56 0.86 0.136 0.118 120 0.88 0.257 0.56 0.86 0.142 0.116 125 0.85 0.260 0.56 0.85 0.147 0.113 130 0.83 0.263 0.56 0.85 0.152 0.111 135 0.80 0.266 0.55 0.85 0.157 0.108 140 0.78 0.268 0.55 0.84 0.163 0.106 145 0.76 0.271 0.55 0.84 0.168 0.103 150 0.74 0.273 0.55 0.84 0.173 0.100 155 0.73 0.276 0.55 0.84 0.178 0.097 160 0.71 0.278 0.55 0.83 0.184 0.094 165 0.69 0.280 0.54 0.83 0.189 0.091 170 0.68 0.282 0.54 0.83 0.194 0.088 175 0.66 0.284 0.54 0.83 0.200 0.085 180 0.65 0.286 0.54 0.83 0.205 0.081 185 0.64 0.288 0.54 0.82 0.210 0.078 190 0.62 0.290 0.54 0.82 0.215 0.075 195 0.61 0.292 0.54 0.82 0.221 0.071 200 0.60 0.294 0.54 0.82 0.226 0.068 205 0.59 0.296 0.54 0.82 0.231 0.065 210 0.58 0.298 0.53 0.82 0.236 0.061 215 0.57 0.299 0.53 0.82 0.242 0.058 220 0.56 0.301 0.53 0.81 0.247 0.054 225 0.55 0.303 0.53 0.81 0.252 0.050 230 0.54 0.304 0.53 0.81 0.257 0.047 235 0.53 0.306 0.53 0.81 0.263 0.043 240 0.52 0.307 0.53 0.81 0.268 0.039 245 0.51 0.309 0.53 0.81 0.273 0.036 250 0.51 0.310 0.53 0.81 0.279 0.032 255 0.50 0.312 0.53 0.81 0.284 0.028 260 0.49 0.313 0.53 0.81 0.289 0.024 265 0.48 0.315 0.53 0.81 0.294 0.021 270 0.48 0.316 0.53 0.81 0.300 0.017 275 0.47 0.318 0.53 0.80 0.305 0.013 280 0.46 0.319 0.53 0.80 0.310 0.009 285 0.46 0.320 0.53 0.80 0.315 0.005 290 0.45 0.322 0.53 0.80 0.321 0.001 295 0.45 0.323 0.52 0.80 0.326 -0.003 300 0.44 0.324 0.52 0.80 0.331 -0.007 Design Information (Input): Catchment Drainage Imperviousness Catchment Drainage Area Predevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rate One -hour Precipitation Design Rainfall IDF Formula i = Ci* PAC2+Tc)"C3 Coefficient One Coefficient Two Coefficient Three la = A= Type = T= Tc = q= Pi _ Ci _ C2 = C3 = 31.00 percent 5.560 B 100 15 0.28 2.71 28.50 10 0.789 acres A, B, C, or D years (2, 5, 10, 25, 50, or 100) minutes cfs/acre inches Determination of Average Outflow from the Basin (Calculated): cfs cfs cubic acre -ft feet Runoff Coefficient Inflow Peak Runoff Allowable Peak Outflow Rate Mod. FAA Major Storage Mod. FAA Major Storage Qp-out Volume Volume Qp-in C = = = = = 0.47 16.18 1.53 25,806 0.592 Rainfall Duration minutes (input) Rainfall Intensity inches (output) / hr Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0 0.00 0.000 0.00 0.00 0.000 0.000 5 9.12 0.164 1.00 1.53 0.011 0.154 10 7.27 0.262 1.00 1.53 0.021 0.240 15 6.09 0.329 0.98 1.50 0.031 0.298 20 5.28 0.380 0.86 1.32 0.036 0.344 25 4.67 0.420 0.79 1.21 0.042 0.379 30 4.21 0.454 0.74 1.13 0.047 0.407 35 3.83 0.483 0.71 1.08 0.052 0.431 40 3.53 0.508 0.68 1.04 0.057 0.450 45 3.27 0.530 0.66 1.01 0.063 0.467 50 3.05 0.550 0.65 0.99 0.068 0.482 55 2.87 0.568 0.63 0.97 0.073 0.494 60 2.70 0.584 0.62 0.95 0.078 0.506 65 2.56 0.599 0.61 0.94 0.084 0.515 70 2.43 0.613 0.60 0.92 0.089 0.524 75 2.32 0.626 0.60 0.91 0.094 0.532 80 2.22 0.639 0.59 0.90 0.100 0.539 85 2.13 0.650 0.59 0.89 0.105 0.545 90 2.04 0.661 0.58 0.89 0.110 0.551 95 1.96 0.672 0.58 0.88 0.115 0.556 100 1.89 0.681 0.57 0.88 0.121 0.561 105 1.83 0.691 0.57 0.87 0.126 0.565 110 1.77 0.700 0.57 0.87 0.131 0.569 115 1.71 0.708 0.56 0.86 0.136 0.572 120 1.66 0.717 0.56 0.86 0.142 0.575 125 1.61 0.725 0.56 0.85 0.147 0.578 130 1.57 0.732 0.56 0.85 0.152 0.580 135 1.52 0.740 0.55 0.85 0.157 0.582 140 1.48 0.747 0.55 0.84 0.163 0.584 145 1.44 0.754 0.55 0.84 0.168 0.586 150 1.41 0.760 0.55 0.84 0.173 0.587 155 1.37 0.767 0.55 0.84 0.178 0.588 160 1.34 0.773 0.55 0.83 0.184 0.590 165 1.31 0.779 0.54 0.83 0.189 0.590 170 1.28 0.785 0.54 0.83 0.194 0.591 175 1.26 0.791 0.54 0.83 0.200 0.592 180 1.23 0.797 0.54 0.83 0.205 0.592 185 1.20 0.802 0.54 0.82 0.210 0.592 190 1.18 0.808 0.54 0.82 0.215 0.592 195 1.16 0.813 0.54 0.82 0.221 0.592 200 1.14 0.818 0.54 0.82 0.226 0.592 205 1.12 0.823 0.54 0.82 0.231 0.592 210 1.10 0.828 0.53 0.82 0.236 0.592 215 1.08 0.833 0.53 0.82 0.242 0.591 220 1.06 0.838 0.53 0.81 0.247 0.591 225 1.04 0.842 0.53 0.81 0.252 0.590 230 1.02 0.847 0.53 0.81 0.257 0.589 235 1.01 0.851 0.53 0.81 0.263 0.589 240 0.99 0.856 0.53 0.81 0.268 0.588 245 0.98 0.860 0.53 0.81 0.273 0.587 250 0.96 0.864 0.53 0.81 0.279 0.586 255 0.95 0.868 0.53 0.81 0.284 0.584 260 0.93 0.872 0.53 0.81 0.289 0.583 265 0.92 0.876 0.53 0.81 0.294 0.582 270 0.91 0.880 0.53 0.81 0.300 0.581 275 0.89 0.884 0.53 0.80 0.305 0.579 280 0.88 0.888 0.53 0.80 0.310 0.578 285 0.87 0.892 0.53 0.80 0.315 0.576 290 0.86 0.895 0.53 0.80 0.321 0.575 295 0.85 0.899 0.52 0.80 0.326 0.573 300 0.84 0.903 0.52 0.80 0.331 0.571 Mod. FAA Minor Storage Volume (cubic ft.) = 5,730 Mod. FAA Minor Storage Volume (acre -ft.) = 0.1315 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 Mod. FAA Major Storage Volume (cubic ft.) _ 25,806 Mod. FAA Major Storage Volume (acre -ft.) = 0.5924 ud-detention v2.35 North.xls, Modified FAA 2/6/2025, 9:26 AM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Chevron Irvine Storage Facility Basin ID: North Pond ID 7••••••• ••• �• • • • • • 000op OOOOOOOO OOO 000oscH o 00 O�ppOOO OpOO Opppp _ Op Opp _ O n „ UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 ud-detention v2.35 North.xls, Modified FAA 2/6/2025, 9:26 AM STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Chevron Irvine Storage Facility Basin ID: North Pond Dam Side Slope Z Side Slope Z L 4 Design Information (Input): Width of Basin Bottom, W = Length of Basin Bottom, L = Dam Side -slope (H:V), Zd = Stage -Storage Relationship: Ik, Side Slope Z r f+. ft ft ft/ft L Flati1�er. 5 Side Slope Z Side Slope s Check Basin Shape Right Triangle Isosceles Triangle Rectangle Circle / Ellipse Irregular Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum': X MINOR L OR... OR... OR... OR... (Use Overide values in cells G32:G52) 0.13 MAJOR 0.59 acre -ft. acre -ft. acre -ft. for WQCV, & Major Labels Stages (input) Storage Minor, Water Surface Elevation (input) ft Side Slope (H:V) Below (input) ft/ft El. Width (output) Basin Stage ft at Length (output) Basin Stage ft at Surface Area Stage (output) ft2 at ft2 Overide Surface Area Stage User at Volume (output) Below Stage ft3 Surface Area Stage acres (output) at Volume acre (output) Below Stage -ft for & Target WQCV, Major Volumes (for goal Volumes Storage seek) Minor, 0.00 44 0.001 0.000 0.10 0.00 0.00 305 17 0.007 0.000 0.20 0.00 0.00 798 73 0.018 0.002 0.30 0.00 0.00 1,522 189 0.035 0.004 0.40 0.00 0.00 2,476 388 0.057 0.009 0.50 0.00 0.00 3,661 695 0.084 0.016 0.60 0.00 0.00 5,075 1,132 0.117 0.026 0.70 0.00 0.00 6,719 1,722 0.154 0.040 0.80 0.00 0.00 8,593 2,487 0.197 0.057 WQCV 0.90 0.00 0.00 10,697 3,452 0.246 0.079 1.00 0.00 0.00 11,094 4,541 0.255 0.104 1.10 0.00 0.00 11,295 5,661 0.259 0.130 1.20 0.00 0.00 11,497 6,801 0.264 0.156 1.30 0.00 0.00 11,700 7,960 0.269 0.183 1.40 0.00 0.00 11,905 9,141 0.273 0.210 1.50 0.00 0.00 12,110 10,341 0.278 0.237 1.60 0.00 0.00 12,316 11,563 0.283 0.265 1.70 0.00 0.00 12,523 12,805 0.287 0.294 1.80 0.00 0.00 12,731 14,067 0.292 0.323 1.90 0.00 0.00 12,940 15,351 0.297 0.352 2.00 0.00 0.00 13,150 16,655 0.302 0.382 2.10 0.00 0.00 13,361 17,981 0.307 0.413 2.20 0.00 0.00 13,573 19,328 0.312 0.444 2.30 0.00 0.00 13,786 20,696 0.316 0.475 2.40 0.00 0.00 14,000 22,085 0.321 0.507 Outlet Structure 2.50 0.00 0.00 14,215 23,496 0.326 0.539 2.60 0.00 0.00 14,431 24,928 0.331 0.572 100-yr WSE 2.70 0.00 0.00 14,648 26,382 0.336 0.606 2.80 0.00 0.00 14,866 27,858 0.341 0.640 2.90 0.00 0.00 15,085 29,355 0.346 0.674 Spillway Crest 3.00 0.00 0.00 15,304 30,875 0.351 0.709 3.10 0.00 0.00 15,525 32,416 0.356 0.744 3.20 0.00 0.00 15,747 33,980 0.362 0.780 3.30 0.00 0.00 15,970 35,565 0.367 0.816 3.40 0.00 0.00 16,193 37,174 0.372 0.853 3.50 0.00 0.00 0.00 16,418 16,644 38,804 0.377 0.891 3.60 0.00 40,457 0.382 0.929 3.70 0.00 0.00 16,870 42,133 0.387 0.967 3.80 0.00 0.00 17,098 43,831 0.393 1.006 3.90 0.00 0.00 17,326 45,553 0.398 1.046 4.00 0.00 0.00 17,556 47,297 0.403 1.086 4.10 0.00 0.00 17,786 49,064 0.408 1.126 4.20 0.00 0.00 18,017 50,854 0.414 1.167 4.30 0.00 0.00 18,249 52,667 0.419 1.209 ud-detention v2.35 North.xls, Basin 2/6/2025, 9:26 AM STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: ud-detention v2.35 North.xls, Basin 2/6/2025, 9:26 AM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: Chevron Irvine Storage Facility Basin ID: North Pond WQCV Design Volume (Input): Catchment Imperviousness, la = Catchment Area, A = Depth at WQCV outlet above lowest perforation, H = Vertical distance between rows, h = Number of rows, NL = Orifice discharge coefficient, Co = Slope of Basin Trickle Channel, S = Time to Drain the Pond = Watershed Design Information (Input): Percent Soil Type A = Percent Soil Type B = Percent Soil Type C/D = Outlet Design Information (Output): 3 31.0 5.56 2.5 4.00 7.00 0.60 0.010 40 45 55 0 percent acres Diameter of holes, D = feet Number of holes per row, N = inches ft/ft hours Height of slot, H = Width of slot, W = Water Quality Capture Volume, WQCV = Water Quality Capture Volume (WQCV) _ Design Volume (WQCV / 12 * Area * 1.2) Vol = Outlet area per row, A0 = Total opening area at each row based on user -input above, A0 = Total opening area at each row based on user -input above, A0 = 0.460 1 OR 0.141 0.065 0.078 0.17 0.17 0.001 inches inches inches watershed inches acre-feet acre-feet square inches square inches square feet O O O o O o O O O O O O o O O o O O o O O o O O O O o O O o O o O O O O O O O Perforated Plate Examples Central Elevations of Rows of Holes in feet E Flow Row 1 Row 2 Row 3 Row 4 Row 5 Row 6 Row 7 Row 8 Row 9 Row 10 Row 11 Row 12 Row 13 Row 14 Row 15 Row 16 Row 17 Row 18 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23 0.10 I 0.43 I 0.77 I 1.10 I 1.43 I 1.77 I 2.10 I I I I I I I I I I I I I I I I Collection Capacity for Each Row of Holes in cfs 0.00 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.10 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.20 0.0018 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.30 0.0025 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.40 0.0030 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.50 0.0035 0.0015 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.60 0.0039 0.0023 0.0000 0.0000 0.0000 0.0000 0.0000 0.01 0.01 0.70 0.0043 0.0029 0.0000 0.0000 0.0000 0.0000 0.0000 0.80 0.0047 0.0034 0.0010 0.0000 0.0000 0.0000 0.0000 0.01 0.90 0.0050 0.0038 0.0020 0.0000 0.0000 0.0000 0.0000 0.01 1.00 0.0053 0.0042 0.0027 0.0000 0.0000 0.0000 0.0000 0.01 1.10 0.0056 0.0046 0.0032 0.0000 0.0000 0.0000 0.0000 0.01 1.20 0.0058 0.0049 0.0036 0.0018 0.0000 0.0000 0.0000 0.02 1.30 0.0061 0.0052 0.0041 0.0025 0.0000 0.0000 0.0000 0.02 1.40 0.0063 0.0055 0.0044 0.0030 0.0000 0.0000 0.0000 0.02 1.50 0.0066 0.0058 0.0048 0.0035 0.0015 0.0000 0.0000 0.02 1.60 0.0068 0.0060 0.0051 0.0039 0.0023 0.0000 0.0000 0.02 1.70 0.0070 0.0063 0.0054 0.0043 0.0029 0.0000 0.0000 0.03 1.80 0.0073 0.0065 0.0056 0.0047 0.0034 0.0010 0.0000 0.03 1.90 0.0075 0.0067 0.0059 0.0050 0.0038 0.0020 0.0000 0.03 2.00 0.0077 0.0070 0.0062 0.0053 0.0042 0.0027 0.0000 0.03 2.10 0.0079 0.0072 0.0064 0.0056 0.0046 0.0032 0.0000 0.03 2.20 0.0081 0.0074 0.0067 0.0058 0.0049 0.0036 0.0018 0.04 2.30 0.0083 0.0076 0.0069 0.0061 0.0052 0.0041 0.0025 0.04 2.40 0.0084 0.0078 0.0071 0.0063 0.0055 0.0044 0.0030 0.04 2.50 0.0086 0.0080 0.0073 0.0066 0.0058 0.0048 0.0035 0.04 2.60 0.0088 0.0082 0.0075 0.0068 0.0060 0.0051 0.0039 0.05 0.05 2.70 0.0090 0.0084 0.0077 0.0070 0.0063 0.0054 0.0043 2.80 0.0091 0.0086 0.0079 0.0073 0.0065 0.0056 0.0047 0.05 2.90 0.0093 0.0087 0.0081 0.0075 0.0067 0.0059 0.0050 0.05 3.00 0.0095 0.0089 0.0083 0.0077 0.0070 0.0062 0.0053 0.05 3.10 0.0096 0.0091 0.0085 0.0079 0.0072 0.0064 0.0056 0.05 3.20 0.0098 0.0093 0.0087 0.0081 0.0074 0.0067 0.0058 0.06 3.30 0.0100 0.0094 0.0089 0.0083 0.0076 0.0069 0.0061 0.06 3.40 0.0101 0.0096 0.0090 0.0084 0.0078 0.0071 0.0063 0.06 3.50 0.0103 0.0098 0.0092 0.0086 0.0080 0.0073 0.0066 0.06 3.60 0.0104 0.0099 0.0094 0.0088 0.0082 0.0075 0.0068 0.06 3.70 0.0106 0.0101 0.0095 0.0090 0.0084 0.0077 0.0070 0.06 3.80 0.0107 0.0102 0.0097 0.0091 0.0086 0.0079 0.0073 0.06 3.90 0.0108 0.0104 0.0098 0.0093 0.0087 0.0081 0.0075 0.06 4.00 0.0110 0.0105 0.0100 0.0095 0.0089 0.0083 0.0077 0.07 4.10 0.0111 0.0107 0.0102 0.0096 0.0091 0.0085 0.0079 0.07 4.20 0.0113 0.0108 0.0103 0.0098 0.0093 0.0087 0.0081 0.07 4.30 0.0114 0.0109 0.0105 0.0100 0.0094 0.0089 0.0083 I0.07 Override Area Row 1 Override Area Row 2 Override Area Row 3 Override Area Row 4 Override Area Row 5 Override Area Row 6 Override Area Row 7 Override Area Row 8 Override Area Row 9 Override Area Row 10 Override Area Row 11 Override Area Row 12 Override Area Row 13 Override Area Row 14 Override Area Row 15 Override Area Row 16 Override Area Row 17 Override Area Row 18 Override Area Row 19 Override Area Row 20 Override Area Row 21 Override Area Row 22 Override Area Row 23 Override Area Row 24 ud-detention v2.35 North.xls, WQCV 2/6/2025, 9:26 AM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: Chevron Irvine Storage Facility Basin ID: North Pond STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE a) a) CD CD a) as 5.00 0. 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.( Discharge (cfs) 8 J ud-detention v2.35 North.xls, WQCV 2/6/2025, 9:26 AM RESTRICTOR PLATE SIZING FOR CIRCULAR VERTICAL ORIFICES Project: Chevron Irvine Storage Facility Basin ID: North Pond X G O .� LI G \ G i✓, G G Sizing the Restrictor Plate for Circular Vertical Orifices or Pipes (Input) Water Surface Elevation at Design Depth Pipe/Vertical Orifice Entrance Invert Elevation Required Peak Flow through Orifice at Design Depth Pipe/Vertical Orifice Diameter (inches) Orifice Coefficient Full -flow Capacity (Calculated) Full -flow area Half Central Angle in Radians Full -flow capacity Calculation of Orifice Flow Condition Half Central Angle (0<Theta<3.1416) Flow area Top width of Orifice (inches) Height from Invert of Orifice to Bottom of Plate (feet) Elevation of Bottom of Plate Resultant Peak Flow Through Orifice at Design Depth Width of Equivalent Rectangular Vertical Orifice Elev: WS = Elev: Invert = Q= Dia = Co = Af = Theta = Qf = Percent of Design Flow = Theta = A0 _ To = Yo = Elev Plate Bottom Edge = Q0 _ Equivalent Width #1 Vertical Orifice #2 Vertical Orifice 2.66 0.00 1.53 12.0 0.60 0.79 3.14 5.6 363% 1.17 0.20 11.03 0.30 0.30 1.5 0.67 feet feet cfs inches sq ft rad cfs rad sq ft inches feet feet cfs feet ud-detention v2.35 North.xls, Restrictor Plate 2/6/2025, 9:26 AM STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: Chevron Irvine Storage Facility Basin ID: North Pond Current Routing Order is #3 Design Information (Input): Circular Opening: OR Rectangular Opening: Diameter in Inches Width in Feet Length (Height for Vertical) Dia. _ W= LorH= Percentage of Open Area After Trash Rack Reduction % open = Orifice Coefficient Co = Weir Coefficient Cw = Orifice Elevation (Bottom for Vertical) Eo = Calculation of Collection Capacity: Net Opening Area (after Trash Rack Reduction) OPTIONAL: User-Overide Net Opening Area Perimeter as Weir Length OPTIONAL: User-Overide Weir Length #1 Horiz. v W.S. EL. Major v W.S. EL. Minor v W.S. EL. WQ Routing Order#2 V1 WQ H1 V? Routing Order #4 v.. W.S. EL, Emergency Spillway v W.S. EL. Major Emergency Overflow into Pipe- H2 p W.S. EL. Minor v W.S. EL. WQ Hl V2 V1 V #2 Horiz. #1 Vert. #2 Vert. 4.00 4.00 0.67 0.30 50 100 0.60 0.60 3.00 2.50 0.00 Aa = 8.00 Aa = LW = 12.00 Lw = Top Elevation of Vertical Orifice Opening, Top = Center Elevation of Vertical Orifice Opening, Cen = 0.20 i i ft. ft. 0.30 0.15 inches ft. ft. ft. sq. ft. sq. ft. ft. ft. Routing 3: Single Stage - Water flows through WQCV plate and #1 horizontal opening into #1 vertical opening. This flow will be applied to culvert sheet (#2 vertical & horizontal openings is not used). Horizontal Orifices (Vertical Orifices Labels for WQCV, & Major W.S. Elevations (input) Minor, Storage Surface Elevation (linked) Water ft WQCV Plate/Riser (User Flow cfs -linked) #1 (output) Weir Flow Horiz. cfs #1 (output) Orifice Flow Horiz. cfs #2 (output) Weir Flow Horiz. cfs #2 Orifice (output) Flow Horiz. cfs #1 Collection Capacity (output) Vert. cfs #2 Collection Capacity (output) cfs Vert. Collection Capacity (output) Total cfs Target for WQCV, & Major (link Volumes for Volumes Storage goal Minor, seek) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.00 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.20 0.00 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.30 0.00 0.00 0.00 0.00 0.00 0.37 0.00 0.00 0.40 0.00 0.00 0.00 0.00 0.00 0.48 0.00 0.00 0.50 0.00 0.00 0.00 0.00 0.00 0.57 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.65 0.000.01 0.60 0.70 0 0.00 0.00 0.00 0.00 0.72 0.000.01 0.80 0 0.00 0.00 0.00 0.00 0.78 0.00 0.01 WQCV 0.90 0.01 0.00 0.00 0.00 0.00 0.84 0.00 0.01 1.00 0.01 0.00 0.00 0.00 0.00 0.89 0.00 0.01 1.10 0.01 +++ 0+0 o.00 +++ +•- 0.00 0.01 1.20 0.02 0.00 0.00 0.00 0.00 0.99 0.00 0.02 1.30 0.02 0.00 0.00 0.00 0.00 1.04 0.00 0.02 1.40 0.02 0.00 0.00 0.00 0.00 1.08 0.00 0.02 1.50 0.02 0.00 0.00 0.00 0.00 1.12 0.00 0.02 1.60 0.02 0.00 0.00 0.00 0.00 1.17 0.00 0.02 1.70 0.03 0.00 0.00 0.00 0.00 1.20 0.00 0.03 1.800.03 0.00 0.00 0.00 0.00 1.24 0.00 0.03 1.90 0.03 0.00 0.00 0.00 0.00 1.28 0.00 0.03 2.00 0.03 0.00 0.00 0.00 0.00 1.32 0.00 0.03 2.10 0.03 0.00 0.00 0.00 0.00 1.35 0.00 0.03 2.20 0.04 0.00 0.00 0.00 0.00 1.39 0.00 0.04 0.04 0.00 0.00 0.00 0.00 1.42 0.00 0.04 2.40 0.04 0.00 0.00 0.00 0.00 1.45 0.00 0.04 Outlet Structure 2.50 0.04 0.00 0.00 0.00 0.00 1.48 0.00 0.04 2.60 0.05 1.14 12.18 +++ +++ 1.51 0.001.18 100-yr 2.70 ++ 0.00 0.00 1.55 0.001.55 2.80 0.05 5.92 21.10 0.00 0.00 1.58 0.001.58 2.900.05 9.11 24.360.00 0.00 1.60 0.00 •0 Spillway - 3.00 0.05 0.00 0.00 1.63 3.10 0.05 16.73 29.84 0.00 0.00 1.66 0.00 1.66 3.20 0.06 21.08 32.230.00 0.00 1.69 0.00 1.69 3.30 0.06 25.76 34.45 0.00 1.72 0.00 1.72 3.40 0.06 30.74 36.540.00 0.00 1.74 0.00 1.74 3.50 0.06 36.00 38.520.00 0.00 1.77 0.00 1.77 3.60 0.06 41.53 40.40 0.00 0.00 1.80 0.00 1.80 3.70 0.06 47.32 42.20 0.00 0.00 1.82 0.00 1.82 3.$0 0.06 53.36 43.92 0.00 1.85 0.00 1.85 3.90 0.06 59.63 45.58 0.00 0.00 1.87 0.00 1.87 4.00 0.07 66.14 47.18 0.00 0.00 1.90 0.00 1.90 4.10 0.07 72.86 48.72 0.00 0.00 1.92 0.00 1.92 4.200.07 79.80 50.22 0.00 1.95 0.00 1.95 4.30 0.07 86.94 51.68 0.00 0.00 1.97 0.00 1.97 ud-detention v2.35 North.xls, Outlet 2/6/2025, 9:26 AM STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: Chevron Irvine Storage Facility Basin ID: North Pond STAGE -DISCHARGE CURVE FOR THE OUTLET STRUCTURE 5 4.5 CD CD CD 4) ct (7) 3.5 3 2.5 2 1.5 1 0.5 0.5 1 Discharge (cfs) 1.5 2 2.5 ud-detention v2.35 North.xls, Outlet 2/6/2025, 9:26 AM DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: Chevron Irvine Storage Facility Basin ID: South Pond (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) Determination of MINOR Detention Volume Using Modified FAA Method Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input): Catchment Drainage Imperviousness Catchment Drainage Area Predevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rate One -hour Precipitation Design Rainfall IDF Formula i = Ci* Pi/(C2+TJAC3 Coefficient One Coefficient Two Coefficient Three la = A= Type = T= Tc = q= Pi _ Ci _ C2 = C3 = 30.00 3.220 B 10 13 0.33 1.43 28.50 10 0.789 percent acres A, B, C, or D years (2, 5, 10, 25, 50, or 100) minutes cfs/acre inches Determination of Average Outflow from the Basin (Calculated): cfs cfs cubic acre -ft for 5 -Minutes) feet Runoff Coefficient Inflow Peak Runoff Allowable Peak Outflow Enter Rate Rainfall Mod. Mod. FAA Minor Storage FAA Minor Storage Duration Incremental Qp-out Volume Volume Increase Qp-in C = = = = = Value 0.32 3.53 1.05 3,006 0.069 5 <- Here (e.g. 5 Rainfall Duration minutes (input) Rainfall Intensity inches (output) / hr Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0 0.00 0.000 0.00 0.00 0.000 0.000 5 4.81 0.034 1.00 1.05 0.007 0.027 10 3.83 0.054 1.00 1.05 0.014 0.040 15 3.22 0.068 0.94 0.98 0.020 0.048 20 2.78 0.079 0.83 0.87 0.024 0.055 25 2.47 0.087 0.76 0.80 0.027 0.060 30 2.22 0.094 0.72 0.75 0.031 0.063 35 2.02 0.100 0.69 0.72 0.035 0.066 40 1.86 0.106 0.66 0.69 0.038 0.067 45 1.73 0.110 0.65 0.68 0.042 0.068 50 1.61 0.114 0.63 0.66 0.045 0.069 55 1.51 0.118 0.62 0.65 0.049 0.069 60 1.43 0.122 0.61 0.64 0.053 0.069 65 1.35 0.125 0.60 0.63 0.056 0.068 70 1.28 0.128 0.59 0.62 0.060 0.068 75 1.22 0.130 0.59 0.61 0.063 0.067 80 1.17 0.133 0.58 0.61 0.067 0.066 85 1.`12 0.135 0.58 0.60 0.071 0.065 90 1.08 0.138 0.57 0.60 0.074 0.063 95 1.04 0.140 0.57 0.60 0.078 0.062 100 1.00 0.142 0.57 0.59 0.082 0.060 105 0.96 0.144 0.56 0.59 0.085 0.059 110 0.93 0.146 0.56 0.59 0.089 0.057 115 0.90 0.147 0.56 0.58 0.092 0.055 120 0.88 0.149 0.55 0.58 0.096 0.053 125 0.85 0.151 0.55 0.58 0.100 0.051 130 0.83 0.152 0.55 0.58 0.103 0.049 135 0.80 0.154 0.55 0.57 0.107 0.047 140 0.78 0.155 0.55 0.57 0.110 0.045 145 0.76 0.157 0.55 0.57 0.114 0.043 150 0.74 0.158 0.54 0.57 0.118 0.041 155 0.73 0.160 0.54 0.57 0.121 0.038 160 0.71 0.161 0.54 0.57 0.125 0.036 165 0.69 0.162 0.54 0.56 0.128 0.034 170 0.68 0.163 0.54 0.56 0.132 0.031 175 0.66 0.165 0.54 0.56 0.136 0.029 180 0.65 0.166 0.54 0.56 0.139 0.027 185 0.64 0.167 0.54 0.56 0.143 0.024 190 0.62 0.168 0.53 0.56 0.146 0.022 195 0.61 0.169 0.53 0.56 0.150 0.019 200 0.60 0.170 0.53 0.56 0.154 0.017 205 0.59 0.171 0.53 0.56 0.157 0.014 210 0.58 0.172 0.53 0.56 0.161 0.012 215 0.57 0.173 0.53 0.56 0.164 0.009 220 0.56 0.174 0.53 0.55 0.168 0.006 225 0.55 0.175 0.53 0.55 0.172 0.004 230 0.54 0.176 0.53 0.55 0.175 0.001 235 0.53 0.177 0.53 0.55 0.179 -0.002 240 0.52 0.178 0.53 0.55 0.182 -0.004 245 0.51 0.179 0.53 0.55 0.186 -0.007 250 0.51 0.180 0.53 0.55 0.190 -0.010 255 0.50 0.181 0.53 0.55 0.193 -0.013 260 0.49 0,182 0.53 0.55 0.197 -0.015 265 0.48 0.182 0.52 0.55 0.200 -0.018 270 0.48 0.183 0.52 0.55 0.204 -0.021 275 0.47 0.184 0.52 0.55 0.208 -0.024 280 0.46 0.185 0.52 0.55 0.211 -0.026 285 0.46 0.186 0.52 0.55 0.215 -0.029 290 0.45 0.186 0.52 0.55 0.218 -0.032 295 0.45 0.187 0.52 0.55 0.222 -0.035 300 0.44 0.188 0.52 0.55 0.226 -0.038 Design Information (Input): Catchment Drainage Imperviousness Catchment Drainage Area Predevelopment NRCS Soil Group Return Period for Detention Control Time of Concentration of Watershed Allowable Unit Release Rate One -hour Precipitation Design Rainfall IDF Formula i = Ci* PAC2+Tc)"C3 Coefficient One Coefficient Two Coefficient Three la = A= Type = T= Tc = q= Pi _ Ci _ C2 = C3 = 30.00 percent 3.220 B 100 13 0.33 2.71 28.50 10 0.789 acres A, B, C, or D years (2, 5, 10, 25, 50, or 100) minutes cfs/acre inches Determination of Average Outflow from the Basin (Calculated): cfs cfs cubic acre -ft feet Runoff Coefficient Inflow Peak Runoff Allowable Peak Outflow Rate Mod. FAA Major Storage Mod. FAA Major Storage Qp-out Volume Volume Qp-in C = = = = = 0.47 9.81 1.05 14,074 0.323 Rainfall Duration minutes (input) Rainfall Intensity inches (output) / hr Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0 0.00 0.000 0.00 0.00 0.000 0.000 5 9.12 0.095 1.00 1.05 0.007 0.088 10 7.27 0.151 1.00 1.05 0.014 0.137 15 6.09 0.191 0.94 0.98 0.020 0.170 20 5.28 0.220 0.83 0.87 0.024 0.196 25 4.67 0.244 0.76 0.80 0.027 0.216 30 4.21 0.263 0.72 0.75 0.031 0.232 35 3.83 0.280 0.69 0.72 0.035 0.245 40 3.53 0.294 0.66 0.69 0.038 0.256 45 3.27 0.307 0.65 0.68 0.042 0.265 50 3.05 0.318 0.63 0.66 0.045 0.273 55 2.87 0.329 0.62 0.65 0.049 0.280 60 2.70 0.338 0.61 0.64 0.053 0.286 65 2.56 0.347 0.60 0.63 0.056 0.291 70 2.43 0.355 0.59 0.62 0.060 0.295 75 2.32 0.363 0.59 0.61 0.063 0.299 80 2.22 0.370 0.58 0.61 0.067 0.303 85 2.13 0.377 0.58 0.60 0.071 0.306 90 2.04 0.383 0.57 0.60 0.074 0.309 95 1.96 0.389 0.57 0.60 0.078 0.311 100 1.89 0.395 0.57 0.59 0.082 0.313 105 1.83 0.400 0.56 0.59 0.085 0.315 110 1.77 0.405 0.56 0.59 0.089 0.317 115 1.71 0.410 0.56 0.58 0.092 0.318 120 1.66 0.415 0.55 0.58 0.096 0.319 125 1.61 0.420 0.55 0.58 0.100 0.320 130 1.57 0.424 0.55 0.58 0.103 0.321 135 1.52 0.428 0.55 0.57 0.107 0.322 140 1.48 0.433 0.55 0.57 0.110 0.322 145 1.44 0.437 0.55 0.57 0.114 0.323 150 1.41 0.440 0.54 0.57 0.118 0.323 155 1.37 0.444 0.54 0.57 0.121 0.323 160 1.34 0.448 0.54 0.57 0.125 0.323 165 1.31 0.451 0.54 0.56 0.128 0.323 170 1.28 0.455 0.54 0.56 0.132 0.323 175 1.26 0.458 0.54 0.56 0.136 0.323 180 1.23 0.461 0.54 0.56 0.139 0.322 185 1.20 0.465 0.54 0.56 0.143 0.322 190 1.18 0.468 0.53 0.56 0.146 0.321 195 1.16 0.471 0.53 0.56 0.150 0.321 200 1.14 0.474 0.53 0.56 0.154 0.320 205 1.12 0.477 0.53 0.56 0.157 0.320 210 1.10 0.480 0.53 0.56 0.161 0.319 215 1.08 0.482 0.53 0.56 0.164 0.318 220 1.06 0.485 0.53 0.55 0.168 0.317 225 1.04 0.488 0.53 0.55 0.172 0.316 230 1.02 0.490 0.53 0.55 0.175 0.315 235 1.01 0.493 0.53 0.55 0.179 0.314 240 0.99 0.496 0.53 0.55 0.182 0.313 245 0.98 0.498 0.53 0.55 0.186 0.312 250 0.96 0.500 0.53 0.55 0.190 0.311 255 0.95 0.503 0.53 0.55 0.193 0.310 260 0.93 0.505 0.53 0.55 0.197 0.308 265 0.92 0.508 0.52 0.55 0.200 0.307 270 0.91 0.510 0.52 0.55 0.204 0.306 275 0.89 0.512 0.52 0.55 0.208 0.304 280 0.88 0.514 0.52 0.55 0.211 0.303 285 0.87 0.516 0.52 0.55 0.215 0.302 290 0.86 0.519 0.52 0.55 0.218 0.300 295 0.85 0.521 0.52 0.55 0.222 0.299 300 0.84 0.523 0.52 _ 0.55 0.226 0.297 Mod. FAA Minor Storage Volume (cubic ft.) = 3,006 Mod. FAA Minor Storage Volume (acre -ft.) = 0.0690 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 Mod. FAA Major Storage Volume (cubic ft.) _ 14,074 Mod. FAA Major Storage Volume (acre -ft.) = 0.3231 ud-detention v2.35 South.xls, Modified FAA 2/6/2025, 9:29 AM DETENTION VOLUME BY THE MODIFIED FAA METHOD• • • • • • • 7•-• • of. Project: Chevron Irvine Storage Facility Basin ID: South Pond i f • • I oo°°°O OOOO_ OO OOO - � °°Oo000 °oo�„ UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 ud-detention v2.35 South.xls, Modified FAA 2/6/2025, 9:29 AM STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Chevron Irvine Storage Facility Basin ID: South Pond Dam Side Slope Z Side Slope Z L 4 Design Information (Input): Width of Basin Bottom, W = Length of Basin Bottom, L = Dam Side -slope (H:V), Zd = Stage -Storage Relationship: Ik, Side Slope Z r f+. ft ft ft/ft L Flati1�er. 5 Side Slope Z Side Slope s Check Basin Shape Right Triangle Isosceles Triangle Rectangle Circle / Ellipse Irregular Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum': X MINOR L OR... OR... OR... OR... (Use Overide values in cells G32:G52) 0.07 MAJOR 0.32 acre -ft. acre -ft. acre -ft. for WQCV, & Major Labels Stages (input) Storage Minor, Water Surface Elevation (input) ft Side Slope (H:V) Below (input) ft/ft El. Width (output) Basin Stage ft at Length (output) Basin Stage ft at Surface Area Stage (output) ft2 at ft2 Overide Surface Area Stage User at Volume (output) Below Stage ft3 Surface Area Stage acres (output) at Volume acre (output) Below Stage -ft for & Target WQCV, Major Volumes (for goal Volumes Storage seek) Minor, 0.00 2 0.000 0.000 0.10 0.00 0.00 180 9 0.004 0.000 0.20 0.00 0.00 649 51 0.015 0.001 0.30 0.00 0.00 1,404 153 0.032 0.004 0.40 0.00 0.00 2,445 346 0.056 0.008 0.50 0.00 0.00 3,773 657 0.087 0.015 0.60 0.00 0.00 5,386 1,115 0.124 0.026 0.70 0.00 0.00 7,285 1,748 0.167 0.040 WQCV 0.80 0.00 0.00 8,254 2,525 0.189 0.058 0.90 0.00 0.00 8,439 3,360 0.194 0.077 1.00 0.00 0.00 8,625 4,213 0.198 0.097 1.10 0.00 0.00 8,812 5,085 0.202 0.117 1.20 0.00 0.00 9, 000 5,975 0.207 0.137 1.30 0.00 0.00 9,189 6,885 0.211 0.158 1.40 0.00 0.00 9,377 7,813 0.215 0.179 1.50 0.00 0.00 9,568 8,760 0.220 0.201 1.60 0.00 0.00 9,759 9,727 0.224 0.223 1.70 0.00 0.00 9,952 10,712 0.228 0.246 1.80 0.00 0.00 10,146 11,717 0.233 0.269 1.90 0.00 0.00 10,340 12,741 0.237 0.293 Outlet Structure 2.00 0.00 0.00 10,536 13,785 0.242 0.316 100-yr WSE 2.10 0.00 0.00 10,733 14,849 0.246 0.341 2.20 0.00 0.00 10,930 15,932 0.251 0.366 2.30 0.00 0.00 11,129 17,035 0.255 0.391 2.40 0.00 0.00 11,328 18,158 0.260 0.417 2.50 0.00 0.00 11,529 19,301 0.265 0.443 2.60 0.00 0.00 11,731 20,464 0.269 0.470 2.70 0.00 0.00 11,933 21,647 0.274 0.497 Spillway Crest 2.80 0.00 0.00 12,137 22,850 0.279 0.525 2.90 0.00 0.00 12,342 24,074 0.283 0.553 3.00 0.00 0.00 12, 547 25,319 0.288 0.581 3.10 0.00 0.00 12,754 26,584 0.293 0.610 3.20 0.00 0.00 12,962 27,869 0.298 0.640 3.30 0.00 0.00 13,170 29,176 0.302 0.670 3.40 0.00 0.00 13,380 30,504 0.307 0.700 3.50 0.00 0.00 0.00 13,590 13,802 31,852 0.312 0.731 3.60 0.00 33,222 0.317 0.763 3.70 0.00 0.00 14,014 34,613 0.322 0.795 3.80 0.00 0.00 14,228 36,025 0.327 0.827 3.90 0.00 0.00 14,442 37,458 0.332 0.860 4.00 0.00 0.00 14,657 38,913 0.336 0.893 4.10 0.00 0.00 14,873 40,390 0.341 0.927 4.20 0.00 0.00 15,090 41,888 0.346 0.962 4.30 0.00 0.00 15,308 43,408 0.351 0.997 ud-detention v2.35 South.xls, Basin 2/6/2025, 9:29 AM STAGE -STORAGE SIZING FOR DETENTION BASINS Project: Basin ID: ud-detention v2.35 South.xls, Basin 2/6/2025, 9:29 AM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: Chevron Irvine Storage Facility Basin ID: South Pond WQCV Design Volume (Input): Catchment Imperviousness, la = Catchment Area, A = Depth at WQCV outlet above lowest perforation, H = Vertical distance between rows, h = Number of rows, NL = Orifice discharge coefficient, Co = Slope of Basin Trickle Channel, S = Time to Drain the Pond = Watershed Design Information (Input): Percent Soil Type A = Percent Soil Type B = Percent Soil Type C/D = Outlet Design Information (Output): 3 30.0 3.22 2.00 4.00 6.00 0.60 0.010 40 22 78 0 percent acres Diameter of holes, D = feet Number of holes per row, N = inches ft/ft hours Height of slot, H = Width of slot, W = Water Quality Capture Volume, WQCV = Water Quality Capture Volume (WQCV) _ Design Volume (WQCV / 12 * Area * 1.2) Vol = Outlet area per row, A0 = Total opening area at each row based on user -input above, A0 = Total opening area at each row based on user -input above, A0 = 0.379 1 OR 0.141 0.038 0.045 0.11 0.11 0.001 inches inches inches watershed inches acre-feet acre-feet square inches square inches square feet O O O o O o O O O O O O o O O o O O o O O o O O O O o O O o O o O O O O O O O Perforated Plate Examples Central Elevations of Rows of Holes in feet E Flow Row 1 Row 2 Row 3 Row 4 Row 5 Row 6 Row 7 Row 8 Row 9 Row 10 Row 11 Row 12 Row 13 Row 14 Row 15 Row 16 Row 17 Row 18 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23 0.10 I 0.43 0.77 1.10 1.43 1.77 I I Collection Capacity for Each Row of Holes in cfs 0.00 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.10 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.20 0.0012 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.30 0.0017 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.40 0.0021 0.0000 0.0000 0.0000 0.0000 0.0000 0.00 0.50 0.0024 0.0010 0.0000 0.0000 0.0000 0.0000 0.00 0.60 0.0027 0.0016 0.0000 0.0000 0.0000 0.0000 0.00 0.70 0.0029 0.0020 0.0000 0.0000 0.0000 0.0000 0.00 0.80 0.0031 0.0023 0.0007 0.0000 0.0000 0.0000 0.01 0.90 0.0034 0.0026 0.0014 0.0000 0.0000 0.0000 0.01 1.00 0.0036 0.0028 0.0018 0.0000 0.0000 0.0000 0.01 1.10 0.0038 0.0031 0.0022 0.0000 0.0000 0.0000 0.01 1.20 0.0039 0.0033 0.0025 0.0012 0.0000 0.0000 0.01 1.30 0.0041 0.0035 0.0027 0.0017 0.0000 0.0000 0.01 1.40 0.0043 0.0037 0.0030 0.0021 0.0000 0.0000 0.01 1.50 0.0045 0.0039 0.0032 0.0024 0.0010 0.0000 0.01 1.60 0.0046 0.0041 0.0034 0.0027 0.0016 0.0000 0.02 1.70 0.0048 0.0042 0.0036 0.0029 0.0020 0.0000 0.02 1.80 0.0049 0.0044 0.0038 0.0031 0.0023 0.0007 0.02 1.90 0.0051 0.0046 0.0040 0.0034 0.0026 0.0014 0.02 2.00 0.0052 0.0047 0.0042 0.0036 0.0028 0.0018 0.02 2.10 0.0053 0.0049 0.0043 0.0038 0.0031 0.0022 0.02 2.20 0.0055 0.0050 0.0045 0.0039 0.0033 0.0025 0.02 2.30 0.0056 0.0051 0.0047 0.0041 0.0035 0.0027 0.03 2.40 0.0057 0.0053 0.0048 0.0043 0.0037 0.0030 0.03 2.50 0.0058 0.0054 0.0050 0.0045 0.0039 0.0032 0.03 2.60 0.0060 0.0055 0.0051 0.0046 0.0041 0.0034 0.03 0.03 2.70 0.0061 0.0057 0.0052 0.0048 0.0042 0.0036 2.80 0.0062 0.0058 0.0054 0.0049 0.0044 0.0038 0.03 2.90 0.0063 0.0059 0.0055 0.0051 0.0046 0.0040 0.03 3.00 0.0064 0.0060 0.0056 0.0052 0.0047 0.0042 0.03 3.10 0.0065 0.0062 0.0057 0.0053 0.0049 0.0043 0.03 3.20 0.0066 0.0063 0.0059 0.0055 0.0050 0.0045 0.03 3.30 0.0067 0.0064 0.0060 0.0056 0.0051 0.0047 0.03 3.40 0.0068 0.0065 0.0061 0.0057 0.0053 0.0048 0.04 3.50 0.0069 0.0066 0.0062 0.0058 0.0054 0.0050 0.04 3.60 0.0070 0.0067 0.0063 0.0060 0.0055 0.0051 0.04 3.70 0.0071 0.0068 0.0064 0.0061 0.0057 0.0052 0.04 3.80 0.0072 0.0069 0.0066 0.0062 0.0058 0.0054 0.04 3.90 0.0073 0.0070 0.0067 0.0063 0.0059 0.0055 0.04 4.00 0.0074 0.0071 0.0068 0.0064 0.0060 0.0056 0.04 4.10 0.0075 0.0072 0.0069 0.0065 0.0062 0.0057 0.04 4.20 0.0076 0.0073 0.0070 0.0066 0.0063 0.0059 0.04 4.30 0.0077 0.0074 0.0071 0.0067 0.0064 0.0060 3 I0.04 Override Area Row 1 Override Area Row 2 Override Area Row 3 Override Area Row 4 Override Area Row 5 Override Area Row 6 Override Area Row 7 Override Area Row 8 Override Area Row 9 Override Area Row 10 Override Area Row 11 Override Area Row 12 Override Area Row 13 Override Area Row 14 Override Area Row 15 Override Area Row 16 Override Area Row 17 Override Area Row 18 Override Area Row 19 Override Area Row 20 Override Area Row 21 Override Area Row 22 Override Area Row 23 Override Area Row 24 ud-detention v2.35 South.xls, WQCV 2/6/2025, 9:29 AM STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: Chevron Irvine Storage Facility Basin ID: South Pond STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE a) a) CD CD a) as 5.00 0. 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0.00 00 0.01 0.01 0.02 0.02 0.03 0.03 0.04 0.04 0.( Discharge (cfs) 5 J ud-detention v2.35 South.xls, WQCV 2/6/2025, 9:29 AM RESTRICTOR PLATE SIZING FOR CIRCULAR VERTICAL ORIFICES Project: Chevron Irvine Storage Facility Basin ID: South Pond X G O .� LI G \ G i✓, G G Sizing the Restrictor Plate for Circular Vertical Orifices or Pipes (Input) Water Surface Elevation at Design Depth Pipe/Vertical Orifice Entrance Invert Elevation Required Peak Flow through Orifice at Design Depth Pipe/Vertical Orifice Diameter (inches) Orifice Coefficient Full -flow Capacity (Calculated) Full -flow area Half Central Angle in Radians Full -flow capacity Calculation of Orifice Flow Condition Half Central Angle (0<Theta<3.1416) Flow area Top width of Orifice (inches) Height from Invert of Orifice to Bottom of Plate (feet) Elevation of Bottom of Plate Resultant Peak Flow Through Orifice at Design Depth Width of Equivalent Rectangular Vertical Orifice Elev: WS = Elev: Invert = Q= Dia = Co = Af = Theta = Qf = Percent of Design Flow = Theta = A° _ To = Yo = Elev Plate Bottom Edge = Q0 _ #1 Vertical Orifice #2 Vertical Orifice 2.03 0.00 1.05 12.0 0.60 0.79 3.14 4.7 445% 1.06 0.16 10.47 0.26 0.26 1.1 Equivalent Width = 0.62 feet feet cfs inches sq ft rad cfs rad sq ft inches feet feet cfs feet ud-detention v2.35 South.xls, Restrictor Plate 2/6/2025, 9:29 AM STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: Chevron Irvine Storage Facility Basin ID: South Pond Current Routing Order is #3 Design Information (Input): Circular Opening: OR Rectangular Opening: Diameter in Inches Width in Feet Length (Height for Vertical) Dia. _ W= LorH= Percentage of Open Area After Trash Rack Reduction % open = Orifice Coefficient Co = Weir Coefficient Cw = Orifice Elevation (Bottom for Vertical) Eo = Calculation of Collection Capacity: Net Opening Area (after Trash Rack Reduction) OPTIONAL: User-Overide Net Opening Area Perimeter as Weir Length OPTIONAL: User-Overide Weir Length #1 Horiz. v W.S. EL. Major v W.S. EL. Minor v W.S. EL. WQ Routing Order#2 V1 WQ H1 V? Routing Order #4 v.. W.S. EL, Emergency Spillway v W.S. EL. Major Emergency Overflow into Pipe- H2 p W.S. EL. Minor v W.S. EL. WQ Hl V2 V1 V #2 Horiz. #1 Vert. #2 Vert. 4.00 4.00 0.62 0.26 50 100 0.60 0.60 3.00 2.00 0.00 Aa = 8.00 Aa = LW = 12.00 Lw = Top Elevation of Vertical Orifice Opening, Top = Center Elevation of Vertical Orifice Opening, Cen = 0.16 i i ft. ft. 0.26 0.13 inches ft. ft. ft. sq. ft. sq. ft. ft. ft. Routing 3: Single Stage - Water flows through WQCV plate and #1 horizontal opening into #1 vertical opening. This flow will be applied to culvert sheet (#2 vertical & horizontal openings is not used). Horizontal Orifices (Vertical Orifices Labels for WQCV, & Major W.S. Elevations (input) Minor, Storage Surface Elevation (linked) Water ft WQCV Plate/Riser (User Flow cfs -linked) #1 (output) Weir Flow Horiz. cfs #1 (output) Orifice Flow Horiz. cfs #2 (output) Weir Flow Horiz. cfs #2 Orifice (output) Flow Horiz. cfs #1 Collection Capacity (output) cfs Vert. #2 Collection Capacity (output) cfs Vert. Collection Total Capacity (output) cfs Target for WQCV, & Major (link Volumes for Volumes Storage goal Minor, seek) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.00 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.20 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.30 0.00 0.00 0.00 0.00 0.00 0.32 0.00 0.00 0.40 0.00 0.00 0.00 0.00 0.00 0.40 0.00 0.00 0.50 0.00 0.00 0.00 0.00 0.00 0.47 0.00 0.00 0.60 0.00 0.00 0.00 0.00 0.00 0.53 0.00 0.00 0.70 0.00 0.00 0.00 0.00 0.00 0.58 0.00 0.00 0.80 0.01 0.00 0.00 0.00 0.00 0.63 0.00 0.01 WQCV 0.90 0.01 0.00 0.00 0.00 0.00 0.68 0.00 0.01 1.00 0.01 0.00 0.00 0.00 0.00 0.72 0.00 0.01 1.10 0.01 0.00 0.00 0.00 0.00 0.76 0.00 0.01 1.20 0.01 0.00 0.00 0.00 0.00 0.80 0.00 0.01 1.30 0.01 0.00 0.00 0.00 0.00 0.83 0.00 0.01 1.40 0.01 0.00 0.00 0.00 0.00 0.87 0.00 0.01 1.50 0.01 0.00 0.00 0.00 0.00 0.90 0.00 0.01 1.60 0.02 0.00 0.00 0.00 0.00 0.93 0.00 0.02 1.70 0.02 0.00 0.00 0.00 0.00 0.97 0.00 0.02 1.80 0.02 0.00 0.00 0.00 0.00 1.00 0.00 0.02 1.90 0.02 0.00 0.00 0.00 0.00 1.02 0.00 0.02 Outlet Structure 2.00 0.02 0.00 0.00 0.00 0.00 1.05 0.00 0.02 100-yr WSE 2.10 0.02 1.14 12.18 0.00 0.00 1.08 0.00 1.08 2.20 0.02 3.22 17.23 0.00 0.00 1.11 0.00 1.11 2.30 0.03 5.92 21.10 0.00 0.00 1.13 0.00 1.13 2.40 0.03 9.11 24.36 0.00 0.00 1.16 0.00 1.16 2.50 0.03 12.73 27.24 0.00 0.00 1.19 0.00 1.19 2.60 0.03 16.73 29.84 0.00 0.00 1.21 0.00 1.21 2.70 0.03 21.08 32.23 0.00 0.00 1.24 0.00 1.24 Spillway Crest 2.80 0.03 25.76 34.45 0.00 0.00 1.26 0.00 1.26 2.90 0.03 30.74 36.54 0.00 0.00 1.28 0.00 1.28 3.00 0.03 36.00 38.52 0.00 0.00 1.31 0.00 1.31 3.10 0.03 41.53 40.40 0.00 0.00 1.33 0.00 1.33 3.20 0.03 47.32 42.20 0.00 0.00 1.35 0.00 1.35 3.30 0.03 53.36 43.92 0.00 0.00 1.37 0.00 1.37 3.40 0.04 59.63 45.58 0.00 0.00 1.39 0.00 1.39 3.50 0.04 66.14 47.18 0.00 0.00 1.41 0.00 1.41 3.60 0.04 72.86 48.72 0.00 0.00 1.44 0.00 1.44 3.70 0.04 79.80 50.22 0.00 0.00 1.46 0.00 1.46 3.80 0.04 86.94 51.68 0.00 0.00 1.48 0.00 1.48 3.90 0.04 94.28 53.10 0.00 0.00 1.50 0.00 1.50 4.00 0.04 101.82 54.48 0.00 0.00 1.52 0.00 1.52 4.10 0.04 109.55 55.82 0.00 0.00 1.54 0.00 1.54 4.20 0.04 117.47 57.13 0.00 0.00 1.55 0.00 1.55 4.30 0.04 125.57 58.42 0.00 0.00 1.57 0.00 1.57 ud-detention v2.35 South.xls, Outlet 2/6/2025, 9:29 AM STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: Chevron Irvine Storage Facility Basin ID: South Pond STAGE -DISCHARGE CURVE FOR THE OUTLET STRUCTURE 5 4.5 4 3.5 4D CD CD CD 4) ct (7) 3 2.5 1.5 1 0.5 0 0 0.2 0.4 0.6 0.8 Discharge (cfs) 1 1.2 1.4 1.6 1.8 ud-detention v2.35 South.xls, Outlet 2/6/2025, 9:29 AM Preliminary Drainage Report Chevron New Development Storage Facility Tetra Tech Job #117-7116003 November 21, 2024 PRESENTED TO Chevron North America Exploration and Production Company 2115 117th Avenue Greeley, CO 80634 Prepared by: 11/21/2024 Alexander K. Copeland, P.E. Date Project Engineer Reviewed by: 4/24/2024 Fred Charles, PhD, P.E. Senior Engineering Manager PRESENTED BY Tetra Tech 351 Coffman Street Suite 200 Longmont, CO 80501 (303) 772-5282 tetratech . com TABLE OF CONTENTS 1.0 INTRODUCTION 1 2.0 GENERAL LOCATION AND DESCRIPTION 1 2.1 Location 1 2.2 Description of Property 1 3.0 DRAINAGE DESIGN CRITERIA 3 4.0 HISTORIC AND OFF -SITE BASINS 3 4.1 Major Basin Description 3 4.2 Historic Drainage Patterns 4 4.3 Off -site Drainage Patterns 4 4.4 Off -site Drainage Facilities 4 5.0 DRAINAGE FACILITY DESIGN 5 5.1 General Concept 5 5.2 On -site Drainage Basins 5 5.3 On -site Drainage Facilities 6 5.4 Water Quality and Detention 6 5.5 Drainage Infrastructure Maintenance 7 6.0 CONCLUSION 8 7.0 REFERENCES 8 LIST OF TABLES Table 1: Historic Drainage Basin Peak Flow Summary 4 Table 2: Off -site Drainage Basins Peak Flow Summary 4 Table 3: Developed Drainage Basins Peak Flow 5 Table 4: North Detention Pond Summary 6 Table 5: South Detention Pond Summary 7 APPENDICES APPENDIX A —Figures APPENDIX A-1 Vicinity Map APPENDIX A-2 Historic Drainage Plan APPENDIX A-3 Off -Site Drainage Plan APPENDIX A-4 Developed Drainage Plan APPENDIX A-5 Developed Drainage Plan Cross Sections APPENDIX A-6 Detention Pond Details APPENDIX B -Site Data APPENDIX B-1 FEMA Map APPENDIX B-2 Soil Information APPENDIX B-3 Rainfall Data APPENDIX B-4 Historic Runoff Calculations APPENDIX B-5 Off -Site Runoff Calculations APPENDIX B-6 Developed Runoff Calculations TETRA TECH ii November 2024 APPENDIX C Hydraulic Calculations APPENDIX C-1 Pipe and Culvert Calculations APPENDIX C-2 Drainage Channel Calculations APPENDIX C-3 Drainage Calculations APPENDIX C-4 Detention Pond Calculations n TETRA TECH iii November 2024 ACRONYMS/ABBREVIATIONS i Acronyms/Abbreviations ac ac -ft Definition Acres Acre -Feet cfs Cubic Feet per Second Chevron Chevron North America Exploration and Production Company CUHP Colorado Urban Hydrograph Procedure DCP DCP Midstream ECB Erosion Control Blanket FEMA Federal Emergency Management Agency FIRM N OAA ON OS POA Flood Insurance Rate Map National Oceanic and Atmospheric Administration On -Site Off -Site Point of Analysis SEMSWA Southeast Metro Stormwater Authority TRM Turf Reinforcement Mat UDFCD Urban Drainage and Flood Control District USR Use by Special Review WCR Weld County Road WQCV Water Quality Capture Volume n TETRA TECH iv November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report 1.0 INTRODUCTION The purpose of this report is to present the proposed storm drainage improvements at the Chevron North America Exploration and Production Company (Chevron) New Development Storage Facility. Typical development of any site will introduce impervious elements to the basin. Impervious material within a basin will increase peak stormwater runoff compared with runoff from existing conditions. This report examines the undeveloped flow patterns of off -site and on -site drainage basins and the proposed stormwater facilities designed to mitigate the downstream impact of increased stormwater runoff. The contents of this report are prepared, at a minimum, following Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3 for a Preliminary Drainage Report. 2.0 GENERAL LOCATION AND DESCRIPTION 2.1 LOCATION The New Development Storage Facility site is located on parcel No. 0803.02.0.00.066 located on the west side of Weld County Road (WCR) 47, with the site access road approximately one -quarter mile south of WCR 74 in Weld County, Colorado. The site is in the northeast 1/4 quarter of Section 2, Township 6 North, Range 65 West of the 6th Principal Meridian, in Weld County. Chevron is in the process of subdividing Parcel No. 0803.02.0.00.066 into three separate parcels, each being a minimum of 35 -acres, via Warranty Deed. The facility will be located entirely on Parcel B. A vicinity map is provided in Appendix A-1 (Figure 1). 2.2 DESCRIPTION OF PROPERTY The New Development Storage Facility will be used as a materials storage yard and field office for oil and gas support services. Chevron is proposing this facility to enhance operational efficiency by reducing transportation distances for materials. Currently, materials required for location builds (e.g., recycled road base, riprap, etc.) are stored at Chevron's LaSalle yard located over 13.5 miles away, off WCR 49 and WCR 46. This new location will reduce the impact to County residents and roads by reducing truck travel and expediting construction in the nearby development areas. The land is currently vacant, non -irrigated agricultural dry rangeland. There are multiple active and inactive oil and gas wells on the site. Historically, the land has been used for agricultural purposes but is not actively farmed at this time. Currently, DCP Midstream (DCP) has existing permitted uses on the original parcel. USR18-0057 is an approved Use by Special Review Permit for a 12 -inch natural gas pipeline route that runs across a portion of the south end of the proposed parcel to the compressor station. USR18-0018 is an approved Use by Special Review Permit for DCP's NorthStar Compressor Station and Subdivision Exemption lot (SUBX18-0001) was created to permit the special use on -site. The proposed parcel subdivision will create three separate parcels (A, B, and C) of 35 acres or larger via Warranty Deed. The subdivision is designed so that the boundary of the new Parcel C will completely contain the SUBX18-0001 boundary, which surrounds DCP's lease area from Chevron. Therefore, DCP's special use (USR18-0018) will not encumber the project site (Parcel B) or the other new parcel (Parcel A). The site is currently undeveloped, and the proposed land use will be industrial. Existing topography within the parcel is comprised of mild slopes in an eastern direction. Vegetative cover is comprised of native grasses with no trees. Surrounding land uses include rural residential, agricultural, and oil and gas -related development. n TETRA TECH 1 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report According to the Custom Soil Resource Report for Weld County, Colorado, Southern Part, the soils that make up the site include Otero sandy loam (hydrologic soil group A) with Nelson fine sandy loam (hydrologic soil group B), with average on -site slopes of approximately 1 to 2 percent based on site topographic data. Detailed soil survey reports are provided in Appendix B-2 (Appendices B-2.1 through B-2.4) for the following respective drainage basins that were used in the hydrologic calculations: ON -1, ON -2, OS -1, and OS -2. n TETRA TECH 2 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report 3.0 DRAINAGE DESIGN CRITERIA This report is prepared in compliance with the Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. Within the proposed development, the 100 -year storm is used as the major storm event when evaluating existing and proposed drainage facilities. The 100 -year storm is used because flooding from a storm of this magnitude could cause considerable damage if adequate stormwater controls were not sized for this magnitude of a storm. Previous drainage studies have not been found for this area. This is most likely a result of the site being in a rural environment. Runoff Calculations: Because all the drainage basins for this site are less than 160 acres, the Rational Method was used in stormwater runoff calculations. Time of concentration calculations for individual basins were estimated using the methods detailed within Urban Storm Drainage Criteria Manual, Volume 1, Chapter 6. Runoff calculations are presented in Appendix B-4 through B-6 for historic, off -site, and developed runoff conditions, respectively. Rainfall Data: Site rainfall depth information was obtained from the National Oceanic and Atmospheric Administration (NOAA) Atlas 14, Volume 8, Version 2, Precipitation -Frequency Atlas of the United States (2013) as well as NOAA's Hydrometeorological Design Studies Center's Precipitation Frequency Data Server. Rainfall data are presented in Appendix B-3. Culvert Sizing: Culvert sizes were determined using Bentley CulvertMaster version 10.03.00.03 software. Culvert sizing calculations are provided in Appendix C-1. Drainage Channel Sizing and Erosion Protection: Drainage channels were sized for the 100 -year storm event using Manning's Equation in Bentley FlowMaster version 10.03.00.03. Individual detailed channel calculations are provided in Appendix C-2. Turf Reinforcement Mat (TRM) or Erosion Control Blanket (ECB) is recommended in all drainage channels due to the nature of the on -site soils and erosion potential (moderate to low runoff potential and moderate to high infiltration rates). ROLLMAX VMax SC250 TRM, or approved equal, and North American Green RollMax S150 ECB, or approved equal, are recommended. Riprap will be placed at all culvert outfalls and has been sized according to the Urban Drainage Flood Control District Manual, Volume 2, Chapter 9. A summary of drainage channel calculations, including riprap calculations, is presented in Appendix C-3. Detention Pond Sizing: The detention pond volume was determined using the Urban Drainage and Flood Control District's (UDFCD's) Detention Design — UD-Detention v4.06 spreadsheet, which is based on the Colorado Urban Hydrograph Procedure (CUHP). Following Weld County Engineering and Construction Criteria, the pond was designed without considering full spectrum detention. Outflow will be controlled by an orifice plate, a safety -grated 100 -year orifice, a restrictor plate on the outlet pipe, and an emergency overflow weir capable of conveying the 100 -year flow at a depth of 6 inches or less. The detention pond will have no less than one foot of freeboard to the maximum water surface elevation. 4.0 HISTORIC AND OFF -SITE BASINS 4.1 MAJOR BASIN DESCRIPTION The proposed property is in rural Weld County and is surrounded by agricultural land, low -density residential, and other oil and gas facilities. The proposed development is in Zone X, an Area of Minimal Flood Hazard. The site is located on Flood Insurance Rate Map (FIRM) Panel No. 08123C1250E (effective date January 20, 2016). An annotated FIRM is presented in Appendix B-1. The site is defined by Weld County as a non -urbanizing area. n TETRA TECH 3 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report 4.2 HISTORIC DRAINAGE PATTERNS The project site is located within two historic drainage basins, split across the middle of the site, which have been designated Historic Basin 1 (H-1) and Historic Basin 2 (H-2) (see Figure 2 in Appendix A-2). Runoff within both historic basins flows across the site to the east, with H-1 runoff veering slightly northeast and H-2 runoff veering slightly southeast due to the minor ridge across the middle of the site. Runoff within these basins was analyzed using the Rational Method. The following table provides the peak flow rates for the historic drainage basins that drain to Points of Analysis (POA) A and B. Table 1: Historic Drainage Basin Peak Flow Summary Basin ID H-1 H-2 Area (ac) 5.56 3.22 Peak Flow 10 -Year (cfs) 1.53 1.05 Peak Flow 100 -Year (cfs) 7.05 4.57 The peak 10 -year flow is the allowable release rate for the developed portion of the site. The historic drainage plan is attached to this report as Appendix A-2. 4.3 OFF -SITE DRAINAGE PATTERNS Off -site drainage that drains towards the proposed site is comprised of two basins designated as OS -1 and OS -2 (see Figure 3 in Appendix A-3). Basin OS -1 is the northern off -site basin, while Basin OS -2 is the southern off -site basin. Runoff from Basin OS -1 and OS -2 will be blocked from flowing onto the site by a 4 -foot tall, 4:1 slope perimeter berm on the western edge of the site. Off -site runoff will then flow north (OS -1) and south (OS -2) along the outside of the perimeter berm and then resume the natural easterly flow direction beyond the site. Peak flows for the 10 -year and 100 -year storm events for the off -site drainage basins are provided in the following table. Basin ID OS -1 OS -2 Table 2: Off -site Drainage Basins Peak Flow Summary Area (ac) 55.6 12.4 Peak Flow 10 -Year (cfs) 3.91 2.21 The off -site drainage plan is attached to this report as Appendix A-3. 4.4 OFF -SITE DRAINAGE FACILITIES Peak Flow 100 -Year (cfs) 19.72 9.22 Off -site drainage facilities are not proposed for this location. The western berm will prevent off -site flows from entering the site, and these flows will resume their natural easterly flow direction once they have passed by the edges of the site. n TETRA TECH 4 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report 5.0 DRAINAGE FACILITY DESIGN 5.1 GENERAL CONCEPT The site will be graded to maintain the existing drainage basin split that runs across the middle of the site. Compacted road base will be used for the final ground cover where needed to stabilize the site for truck traffic. An imperviousness factor of 40% was used for this cover, based on recommended values in the Urban Storm Drainage Criteria Manual, Volume 1, Chapter 6. Two double -wide mobile office trailers and two Conex storage containers will be utilized by the on -site employees. These structures are assumed to allow water to flow under them and will not increase the imperviousness of the site. Due to the uncertain nature of the volume and type of stored materials (roadbase, rip -rap, etc.), the imperviousness factor of 40% will be applied to these as well. Piled roadbase would likely store some precipitation, while piled rip -rap would allow some of the precipitation to pass through the void space. Therefore, all graded portions of the site where vehicle traffic and material storage could occur are assumed to have an imperviousness of 40%. The area of the detention ponds is assumed to be 2°/0 impervious per weld County guidelines. Runoff calculations and assumptions may be found in Appendix B-6. 5.2 ON -SITE DRAINAGE BASINS On -site runoff will be detained in two on -site detention ponds and discharged on the northeast and southeast corners of the site (see Figure 4 in Appendix A-4). The peak runoff for the historic condition was calculated for the two areas that drain to each detention pond (North and South Detention Ponds, respectively) to determine the allowable release rate for the pond. The outflow from each detention pond will not exceed their respective 10 -year historic flow rate; the allowable release rate from each detention pond is the 10 -year historic flow from their respective basins. The total allowable release rate from the North Detention Pond is 1.53 cfs, while the total allowable release rate from the South Detention Pond is 1.05 cfs (see Table 1). The discharge locations from the detention ponds are designed so that the runoff drains away from the downstream compressor station and any access roads. The outflows from the detention ponds will not exceed the allowable release rates. Drainage Basin ON -1 includes the northern portion of the site. Runoff from ON -1 drains into the North Channel which conveys runoff along the northeast side of the site, through Culvert North that conveys flow under the access road, and then into the North Detention Pond. Due to the site's grade, no channel will be constructed inside the northern berm of the site, as minimal flow will be intercepted by the berm. Drainage Basin ON -2 includes the southern portion of the site. Runoff from ON -2 drains through the South Channel and then into the South Detention Pond. Due to the site's grade, no channel will be constructed inside the southern berm of the site, as minimal flow will be intercepted by the berm. The Developed Drainage Plan and Cross Sections are presented in Appendix A-4 and Appendix A-5 (Figures 4 and 5), respectively. The following table provides the peak flow rates for the on -site drainage basins. Basin ID ON -1 ON -2 Table 3: Developed Drainage Basins Peak Flow Acres 5.56 3.22 Peak Flow 10 Year (cfs) 5.38 3.38 Peak Flow 100 Year (cfs) 14.88 9.45 Corresponding POA E F n TETRA TECH 5 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report 5.3 ON -SITE DRAINAGE FACILITIES The North Channel conveys flow from ON -1 to Culvert North and ultimately the North Detention Pond. The channel is designed to convey the 100 -year discharge for ON -1 with a minimum of 1 foot of freeboard. The South Channel conveys flow from ON -2 to the South Detention Pond. The channel is designed to convey the 100 -year discharge for ON -2 with a minimum of 1 foot of freeboard. Culvert North conveys flows in the North Channel under the access road located at the northeastern corner of the site. The culvert is designed to convey the 100 -year discharge for Drainage Basin ON -1. Culvert North is proposed to be a 2 -barrel 18 -inch corrugated metal pipe with a slope of approximately 0.5%. The channel and culvert calculations are presented in Appendix C-1, C-2, and the Conveyance Summary in Appendix C-3. 5.4 WATER QUALITY AND DETENTION On -site runoff will be conveyed within drainage ditches and culverts to the on -site detention ponds; detention pond details are presented in Appendix A-6 (Figure 6). The North Detention Pond is designed to detain the total volume of the 100 -year developed storm event for the northern site development, while the South Detention Pond is designed to detain the total volume of the 100 -year developed storm event for the southern site development. A minimum of 1 foot of freeboard will be provided for each detention pond for the 100 -year storm event volume. The required Water Quality Capture Volume (WQCV) will be contained within the detention volume for each detention pond. Outflow from the detention pond will discharge through an outlet structure with a water quality treatment plate to slow the drain time of the detention ponds to allow sediment to settle before the water is discharged from the site. The pond outlet structure contains a 12 -inch -diameter outlet pipe. The outlet pipe will be restricted using a metal plate that is attached to the outlet box to cover a portion of the outlet pipe. This restrictor plate is set at a specific elevation to control the release rate of the detention pond. The restrictor plate elevation has been set so that the peak release rate from the site does not exceed the 10 -year historic flow rate following Weld County Engineering and Construction Criteria and Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. Design calculations for the detention pond and outlet pipe are presented in Appendix C-4. Erosion control measures, such as rip -rap, will be provided at the detention pond outlet, the emergency spillway outlet, and the culvert outlet to protect against erosion. The following tables describe the on -site detention ponds. Table 4: North Detention Pond Summary on o Drainage Area (acres) 5.56 Imperviousness of Drainage Area 31 of Concentration (minutes) 14.5 Time 100 -Year, 1 -Hour Storm Runoff Volume (ac -ft) 0.378 Total 100 -Year, Water Surface Elevation (feet) 4,823.64 of Detention Pond Elevation (feet) 4,825.30 Top Release Rate from Pond (cfs) 1.53 Discharge Velocity from Pond (ft/s) 3.67 n TETRA TECH 6 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report Total Pond Storage at Spillway Crest (ac -ft) 0.709 Table 5: South Detention Pond Summary Pond South Drainage Area (acres) % Imperviousness of Drainage Area Time of Concentration (minutes) 3.22 30 13.1 100 -Year, 1 -Hour Storm Runoff Volume (ac -ft) 0.222 Total 100 -Year, Water Surface Elevation (feet) 4,824.88 Top of Detention Pond Elevation (feet) 4,827.00 Release Rate from Pond (cfs) 1.05 Discharge Velocity from Pond (ft/s) 4.14 Total Pond Storage at Spillway Crest (ac -ft) 0.525 In summary, the two on -site detention ponds are sized to accommodate 100 -year runoff volumes from the newly developed drainage sub -basins. Stormwater discharge from the detention ponds is designed to not exceed the 10 -year historic runoff rate following the specifications provided in the Weld County Engineering and Construction Criteria. Flow restriction plates on each detention pond's discharge pipe will moderate the release rates from the detention ponds to not exceed the 10 -year historic runoff rates. Drain time for each pond was evaluated using the UDFCD detention pond worksheets. Colorado drainage law requires the discharge of 99% of all runoff from all storm events over no more than 120 hours. 5.5 DRAINAGE INFRASTRUCTURE MAINTENANCE Satisfactory operation of on -site drainage components requires scheduled maintenance throughout the life of the site. The following are recommendations for maintenance and inspection that are drawn from the Southeast Metro Stormwater Authority (SEMSWA) in Denver, Colorado. • On -site personnel should be tasked with developing a schedule that reminds them to evaluate all drainage components on -site. o Routinely (monthly) inspect ditches, ponds, culverts, outlet structures, riprap, etc. to ensure locations are free from debris and excess vegetation. o Ensure riprap, culverts, and outlet structures are not compromised. Repair if needed. o Frequency of inspection may need to be more frequent in the first year or two as the site is established. Facilities should be inspected following any storm event. • When mowing, collect clippings and all other trimmings and take them off -site for disposal or dispose of with trash on -site; do not leave in the pond or ditch. • Remove vegetation adjacent to outlet works that may interfere with the operation; note if noxious weeds are present and notify a supervisor to schedule treatment/removal. • During inspection, report damage/compromise to side slopes, pond banks, and outlet structures. Prepare a repair schedule and complete repairs. • It is important to limit the use of fertilizers and pesticides in and around the ponds and ditches to minimize entry into ponds and subsequent downstream waters. n TETRA TECH 7 November 2024 CHEVRON New Development Storage Facility Preliminary Drainage Report • For detention ponds, the accumulated sediment should be removed from the bottom of the outlet structure every 6 months and the pond depths checked at several points. If the thickness of the accumulated sediment is greater than 25 percent of the original design depth, the sediment should be removed. Over time, accumulated sediment will reduce the capacity of the pond and may cause site flooding if not maintained. A typical checklist of questions for operators to answer during inspections is as follows: • Has trash accumulated within the ponds and ditches? • Does vegetative cover compromise the ditch or pond area? • Is there evidence of erosion or instability on pond and ditch slopes? • Is there any sedimentation within the pond, in ditches, and in and around culverts? • Is there any settling and/or cracking of soils in bermed areas? • Are there any upstream or downstream conditions that could impact drainage? Depending on the evaluation, discrepancies should be addressed and fixed as soon as possible. Neglecting repairs may compromise drainage through the site. 6.0 CONCLUSION This report was prepared in compliance with the Weld County Engineering and Construction Criteria and the Urban Storm Drainage Criteria Manual, Volumes 1, 2, and 3. The proposed drainage system for the improvements to the Irvine Storage Facility site will provide detention for the developed sections of the site, releasing flows from the site at the 10 -year historic rates. Releases are as near to the points of design as practical and are not expected to increase adverse impacts on downstream property owners. This Preliminary Drainage Report is being submitted to Weld County for review and approval. 7.0 REFERENCES Weld County Public Works Department. Weld County Engineering and Construction Criteria. January 2021. Federal Emergency Management Agency, Flood Insurance Rate Map Weld County, CO, Panel 08123C1250E, January 2016. U nited States Department of Agriculture National Resources Conservation Service. Custom Soil Resource Report for Weld County, Colorado, Southern Part. U rban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volumes 1-3, January 2021. NOAH Atlas 14, Volume 8, Precipitation -Frequency Atlas of the United States. U.S. Department of Commerce, 2013. n TETRA TECH 8 November 2024 APPENDIX A: FIGURES APPENDIX A-1: VICINITY MAP APPENDIX A-2: HISTORIC DRAINAGE PLAN 11/21/2024 2:08:44 PM - C:/USERSIURACE.HARTOMACCD0CSITETRA TECH F E D B A c•} • �C ta:s% 00 0 �o . b } • S f 0%u, 46 i 1 • } a 0 I1 II .\ us) s ss) 1 1 �� o - f �. • .. 1 ) v fi t\ - Lesorr<0\-13 I . „ .. �.. S► ..L./"t 1.- i ) i t 1 I dd o % .) I I � } { rp "ko d NOBLE SUA - 4078008 I { A ''� r APPROX. LOCH TIO r � o•tCI• U � D 1 1� t 1iI)}1 ( * I 1 .d-- ) t;4. 3.211 • 1)11 ril lil •\ ,et }t1 II I j a� P J a1 I �.r .% 4 S `••J , ( 1 \ � I p� Coo pJ � IL ``, �. cb Oil R \ \I .. c I 1 \ H\ )1 H o r,r, , ) , _ \ 6 iA -N L. . I I-, � t i t, ! 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NO. 4279505 XX XX XX DEVELOPED DRAINAGE BASIN BOUNDARY DRAINAGE FLOW PATH PROPERTY LINE PARCEL BOUNDARY CHAIN LINK FENCE SECTION LINE EXISTING UTILITY EASEMENT EXISTING CONTOUR EXISTING CONTOUR PROPOSED ACCESS ROAD ACTIVE GAS WELL LOCATION ABANDON GAS WELL LOCATION POINT OF ANALYSIS DRAINAGE FLOW DRAINAGE BASIN NAME 10 YEAR PEAK DISCHARGE 100 YEAR PEAK DISCHARGE DRAINAGE BASIN ACREAGE co o Lu o Lu o >- >- Z < O CL r i< < O 0 < CD DC 0 Z < O < r: Lu o Ir_t i— 2 Z O i E co ' - Et < Ho 0 0,_c zz 0 zo z D z , 0 0 in_ LE 0 i I— C < 0 > >al Bar Measures 1 inch, otherwise drawing not to scale APPENDIX A-5: DEVELOPED DRAINAGE PLAN CROSS SECTIONS APPENDIX A-6: DETENTION POND DETAILS APPENDIX B: SITE DATA APPENDIX B-1: FEMA MAP APPENDIX B-2: SOIL INFORMATION APPENDIX B-2.1: SOIL INFORMATION: ON -1 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 27, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 51 Otero sandy loam, 1 to 3 percent slopes 14 References 16 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 3.1 56.3% 51 Otero sandy loam, percent slopes 1 to 3 2.4 43.7% Totals for Area of Interest 5.6 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, 11 Custom Soil Resource Report onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 16 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 17 APPENDIX B-2.2: SOIL INFORMATION: ON -2 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 27, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 51 Otero sandy loam, 1 to 3 percent slopes 14 References 16 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 40° 31' 2" N c c�v S3 40° 30' 56" N 4 M O 531420 531440 531460 Custom Soil Resource Report Soil Map Soil Map may not he valid at this scale. 531420 531440 531460 531480 531500 531520 531540 Map Scale: 1:899 if printed on A portrait (8.5" x 11") sheet. 0 10 20 40 531480 Meters 60 531500 Feet 0 40 80 160 240 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: L TM Zone 13N WGS84 531520 531540 104° 37' 39 W 40° 31 2 N 40° 30' 56" N 9 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 2.6 79.4% 51 Otero sandy loam, percent slopes 1 to 3 0.7 20.6% Totals for Area of Interest 3.2 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, 11 Custom Soil Resource Report onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 16 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 17 APPENDIX B-2.3: SOIL INFORMATION: OS -1 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 26, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 37 Nelson fine sandy loam, 0 to 3 percent slopes 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 14 47 Olney fine sandy loam, 1 to 3 percent slopes 15 51 Otero sandy loam, 1 to 3 percent slopes 16 References 18 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 40° 31' 23" N 40° 30' 58" N 530600 530700 530800 530900 Map Scale: 1:5,370 if printed on A landscape (11" x 8.5") sheet Meters 0 50 100 200 300 Custom Soil Resource Report Soil Map 531000 Feet 0 250 500 1000 1500 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTT/1 Zone 13N WGS84 531100 9 531200 531600 104° 37' 33" W 104° 37' 33" '101 40° 31' 23" N 40° 30' 58" N Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 37 Nelson fine sandy percent slopes loam, 0 to 3 1.5 2.6% 38 Nelson fine sandy percent slopes loam, 3 to 9 9.7 17.4% 47 Olney fine sandy percent slopes loam, 1 to 3 4.5 8.1°/0 51 Otero sandy loam, percent slopes 1 to 3 40.0 71.9% Totals for Area of Interest 55.6 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. 11 Custom Soil Resource Report The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 37 Nelson fine sandy loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 362h Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of statewide importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Olney Percent of map unit: 5 percent Hydric soil rating: No 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H? - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Custom Soil Resource Report Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No Terry Percent of map unit: 5 percent Hydric soil rating: No 47 Olney fine sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 362v Elevation: 4,600 to 5,200 feet Mean annual precipitation: 11 to 15 inches Mean annual air temperature: 46 to 54 degrees F Frost -free period: 125 to 175 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Olney and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Olney Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Mixed deposit outwash Typical profile H1 - 0 to 10 inches: fine sandy loam H2 - 10 to 20 inches: sandy clay loam H3 - 20 to 25 inches: sandy clay loam H4 - 25 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Custom Soil Resource Report Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.0 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4c Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Zigweid Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Custom Soil Resource Report Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, D to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 18 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 19 APPENDIX B-2.4: SOIL INFORMATION: OS -2 USDA United States Department of Agriculture N RCS Natural Resources Conservation Service A product of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local participants Custom Soil Resource Report for Weld County, Colorado, Southern Part March 26, 2024 Preface Soil surveys contain information that affects land use planning in survey areas. They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas. Soil surveys are designed for many different users, including farmers, ranchers, foresters, agronomists, urban planners, community officials, engineers, developers, builders, and home buyers. Also, conservationists, teachers, students, and specialists in recreation, waste disposal, and pollution control can use the surveys to help them understand, protect, or enhance the environment. Various land use regulations of Federal, State, and local governments may impose special restrictions on land use or land treatment. Soil surveys identify soil properties that are used in making various land use or land treatment decisions. The information is intended to help the land users identify and reduce the effects of soil limitations on various land uses. The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm, local, and wider area planning, onsite investigation is needed to supplement this information in some cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/ portal/nres/main/soils/health/) and certain conservation and engineering applications. For more detailed information, contact your local USDA Service Center (https://offices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/? cid=nres 142p2_053951). Great differences in soil properties can occur within short distances. Some soils are seasonally wet or subject to flooding. Some are too unstable to be used as a foundation for buildings or roads. Clayey or wet soils are poorly suited to use as septic tank absorption fields. A high water table makes a soil poorly suited to basements or underground installations. The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (MRCS) has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically. Updated information is available through the NRCS Web Soil Survey, the site for official soil survey information. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require 2 alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. 3 Contents Preface 2 How Soil Surveys Are Made 5 Soil Map 8 Soil Map 9 Legend 10 Map Unit Legend 11 Map Unit Descriptions 11 Weld County, Colorado, Southern Part 13 38 Nelson fine sandy loam, 3 to 9 percent slopes 13 47 Olney fine sandy loam, 1 to 3 percent slopes 14 51 Otero sandy loam, 1 to 3 percent slopes 15 References 17 4 How Soil Surveys Are Made Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area. They include a description of the soils and miscellaneous areas and their location on the landscape and tables that show soil properties and limitations affecting various uses. Soil scientists observed the steepness, length, and shape of the slopes; the general pattern of drainage; the kinds of crops and native plants; and the kinds of bedrock. They observed and described many soil profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The profile extends from the surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock. The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currently, soils are mapped according to the boundaries of major land resource areas (MLRAs). MLRAs are geographically associated land resource units that share common characteristics related to physiography, geology, climate, water resources, soils, biological resources, and land uses (USDA, 2006). Soil survey areas typically consist of parts of one or more MLRA. The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology, landforms, relief, climate, and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform. By observing the soils and miscellaneous areas in the survey area and relating their position to specific segments of the landform, a soil scientist develops a concept, or model, of how they were formed. Thus, during mapping, this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soil or miscellaneous area at a specific location on the landscape. Commonly, individual soils on the landscape merge into one another as their characteristics gradually change. To construct an accurate soil map, however, soil scientists must determine the boundaries between the soils. They can observe only a limited number of soil profiles. Nevertheless, these observations, supplemented by an understanding of the soil -vegetation -landscape relationship, are sufficient to verify predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied. They noted soil color, texture, size and shape of soil aggregates, kind and amount of rock fragments, distribution of plant roots, reaction, and other features that enable them to identify soils. After describing the soils in the survey area and determining their properties, the soil scientists assigned the soils to taxonomic classes (units). Taxonomic classes are concepts. Each taxonomic class has a set of soil characteristics with precisely defined limits. The classes are used as a basis for comparison to classify soils systematically. Soil taxonomy, the system of taxonomic classification used in the United States, is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile. After the soil 5 Custom Soil Resource Report scientists classified and named the soils in the survey area, they compared the individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and research. The objective of soil mapping is not to delineate pure map unit components; the objective is to separate the landscape into landforms or landform segments that have similar use and management requirements. Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions. Some components may be highly contrasting to the other components of the map unit. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The delineation of such landforms and landform segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, onsite investigation is needed to define and locate the soils and miscellaneous areas. Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors, including scale of mapping, intensity of mapping, design of map units, complexity of the landscape, and experience of the soil scientist. Observations are made to test and refine the soil -landscape model and predictions and to verify the classification of the soils at specific locations. Once the soil -landscape model is refined, a significantly smaller number of measurements of individual soil properties are made and recorded. These measurements may include field measurements, such as those for color, depth to bedrock, and texture, and laboratory measurements, such as those for content of sand, silt, clay, salt, and other components. Properties of each soil typically vary from one point to another across the landscape. Observations for map unit components are aggregated to develop ranges of characteristics for the components. The aggregated values are presented. Direct measurements do not exist for every property presented for every map unit component. Values for some properties are estimated from combinations of other properties. While a soil survey is in progress, samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests. Soil scientists interpret the data from these analyses and tests as well as the field -observed characteristics and the soil properties to determine the expected behavior of the soils under different uses. Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management. Some interpretations are modified to fit local conditions, and some new interpretations are developed to meet local needs. Data are assembled from other sources, such as research information, production records, and field experience of specialists. For example, data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity. Soil conditions are predictable over long periods of time, but they are not predictable from year to year. For example, soil scientists can predict with a fairly high degree of accuracy that a given soil will have a high water table within certain depths in most years, but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area, they drew the boundaries of these bodies on aerial photographs and 6 Custom Soil Resource Report identified each as a specific map unit. Aerial photographs show trees, buildings, fields, roads, and rivers, all of which help in locating boundaries accurately. Soil Map The soil map section includes the soil map for the defined area of interest, a list of soil map units on the map and extent of each map unit, and cartographic symbols displayed on the map. Also presented are various metadata about data used to produce the map, and a description of each soil map unit. 8 Custom Soil Resource Report MAP LEGEND Area of Interest (AO!) Area of Interest (AO1) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Y . Blowout r, _ O O v Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background iair°§1 Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 22, Aug 24, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 8, 2021 Jun 12, 2021 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 10 Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 38 Nelson fine sandy percent slopes loam, 3 to 9 6.7 53.6% 47 Olney fine sandy percent slopes loam, 1 to 3 5.2 41.6% 51 Otero sandy loam, percent slopes 1 to 3 0.6 4.8% Totals for Area of Interest 12.4 100.0°/0 Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or 11 Custom Soil Resource Report landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. Soils that have profiles that are almost alike make up a soil series. Except for differences in texture of the surface layer, all the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha -Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. 12 Custom Soil Resource Report Weld County, Colorado, Southern Part 38 Nelson fine sandy loam, 3 to 9 percent slopes Map Unit Setting National map unit symbol: 362j Elevation: 4,800 to 5,050 feet Mean annual precipitation: 13 to 15 inches Mean annual air temperature: 48 to 57 degrees F Frost -free period: 145 to 190 days Farmland classification: Farmland of local importance Map Unit Composition Nelson and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Nelson Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Residuum weathered from sandstone Typical profile H1 - 0 to 9 inches: fine sandy loam H2 - 9 to 30 inches: fine sandy loam H3 - 30 to 34 inches: weathered bedrock Properties and qualities Slope: 3 to 9 percent Depth to restrictive feature: 20 to 40 inches to paralithic bedrock Drainage class: Well drained Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Low (about 3.7 inches) Interpretive groups Land capability classification (irrigated): 4e Land capability classification (nonirrigated): 6e Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No 13 Custom Soil Resource Report Terry Percent of map unit: 5 percent Hydric soil rating: No 47 Olney fine sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 362v Elevation: 4,600 to 5,200 feet Mean annual precipitation: 11 to 15 inches Mean annual air temperature: 46 to 54 degrees F Frost -free period: 125 to 175 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Olney and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Olney Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Mixed deposit outwash Typical profile H1 - 0 to 10 inches: fine sandy loam H2 - 10 to 20 inches: sandy clay loam H3 - 20 to 25 inches: sandy clay loam H4 - 25 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 15 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.0 inches) Interpretive groups Land capability classification (irrigated): 3e Custom Soil Resource Report Land capability classification (nonirrigated): 4c Hydrologic Soil Group: B Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Zigweid Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 51 Otero sandy loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation: 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Custom Soil Resource Report Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water supply, 0 to 60 inches: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: R067BY024CO - Sandy Plains Hydric soil rating: No Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No 16 References American Association of State Highway and Transportation Officials (AASHTO). 2004. Standard specifications for transportation materials and methods of sampling and testing. 24th edition. American Society for Testing and Materials (ASTM). 2005. Standard classification of soils for engineering purposes. ASTM Standard D2487-00. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31. Federal Register. July 13, 1994. Changes in hydric soils of the United States. Federal Register. September 18, 2002. Hydric soils of the United States. Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils in the United States. N ational Research Council. 1995. Wetlands: Characteristics and boundaries. Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U .S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/ nres/detai I/national/soils/?cid=nres 142p2_054262 Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service, U.S. Department of Agriculture Handbook 436. http:// www.nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577 Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of Agriculture, Natural Resources Conservation Service. http:// www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580 Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control, Wetlands Section. U nited States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of Engineers wetlands delineation manual. Waterways Experiment Station Technical Report Y-87-1. U nited States Department of Agriculture, Natural Resources Conservation Service. N ational forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/ home/?cid=nres 142p2_053374 U nited States Department of Agriculture, Natural Resources Conservation Service. N ational range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuse/rangepastu re/?cid=stel prdb 1043084 17 Custom Soil Resource Report U nited States Department of Agriculture, Natural Resources Conservation Service. N ational soil survey handbook, title 430 -VI. http://www.nres.usda.gov/wps/portal/ nres/detail/soils/scientists/?cid=nres142p2 054242 U nited States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/? cid=nres 142p2_053624 U nited States Department of Agriculture, Soil Conservation Service. 1961. Land capability classification. U.S. Department of Agriculture Handbook 210. http:// www.nres.usda.gov/Internet/FSE_DOCUMENTS/nres142p2_052290.pdf 18 APPENDIX B-3: RAINFALL DATA NOAA Atlas 14, Volume 8, Version 2 Location name: Eaton, Colorado, USA* Latitude: 40.5179°, Longitude: -104.6263° Elevation: 4816 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches}1 Average recurrence interval - (years) Duration 1 2 5 10 25 50 100 J 200 500 1000 5 -min 0.242 (0.198-0.2991 0.293 (0.239-0.362) 0.390 (0.316-0.482) 0.482 (0.388-0.598) 0.626 (0.492-0.828) 0.752 (0.570-1.00) 0.889 (0.646-1.22) 1.04 (0.718-1.46) 1.26 (0.830-1.82) 1.44 (0.914-2.10) 10 I -min 00.355 (0.290-0.437) 0.430 (0.350-0.530) 0.571 (0.463-0.706) 0.705 (0.568-0.876) 0.917 1.10 (0.834-1.47) 1.30 (0.945-1.78) 1.52 (1.05-2.14) 2.12 (1.34-3.07) 15 -min 1 p 0.524 (0.427-0.646) 0.696 (0.565-0.861) 0.860 (0.693-1.07) 1.12 (0.878-1.48) 1.34 (1.02-1.79) 1.59 (1.15-2.17) 1.86 (1.28-2.61) 2.26 (1.48-3.26) 2.58 (1.63-3.74) 30 -min I 00.586 (0.478-0.722), 0.708 (0.577-0.873) 0.939 (0.762-1.16) 1.16 (0.935-1.44) 1 1.51 (1.19-2.00) 1.82 (1.38-2.42) 2.15 (1.56-2.94) 2.52 (1.74-3.55) 3.06 (2.01-4.42) 3.51 (2.22-5.09) 60 -min 0.728 (0.594-0.897) 0.871 (0.710-1.07) 1.15 (0.934-1.42) 1.43 (1.15-1.77) 1.87 ` (1.48-2.49) 2.27 (1.72-3.04) 2.71 (1.97-3.72) 3.20 (2.21-4.51) 3.92 I (2.58-5.67) 4.52 (2.86-6.55) 2 -hr 0.871 (0.715-1.06) 1.04 (0.849-1.26) 1.36 (1.12-1.67) I 1.70 (1.38-2.09) 2.24 (1.78-2.96) 2.72 (2.09-3.62) 3.26 (2.40-4.45) 3.88 (2.70-5.42) 4.78 (3.18-6.86) 5.53 (3.54-7.95) 3 -hr 0.951 [(0.785-1.16) 1.12 (0.924-1.36) 1.47 (1.21-1.80) 1.83 (1.49-2.24) 2.42 (1.94-3.20) 2.95 (2.28-3.92) 3.56 (2.63-4.83) 5.25 (3.52-7.51) 6.10 (3.92-8.72) 6-h r 1.08 (0.896-1.30) 1.29 (1.07-1.56) 1.71 (1.41-2.07) 2.12 (1.74-2.57) 2.77 (2.22-3.60) 3.34 (2.59-4.37) 3.98 (2.96-5.34) 4.69 (3.32-6.46) r 5.73 (3.87-8.10) 6.59 (4.29-9.34) 12-h r 1.26 (1.05-1.50) 1.51 (1.26-1.81) 1.97 (1.64-2.37) 2.41 (1.99-2.90) 3.08 (2.48-3.94) 3.66 (2.86-4.72) 4.29 (3.21-5.67) 4.98 (3.55-6.77)i 5.98 (4.07-8.35) 6.80 (4.46-9.54) 24 -hr 1.50 (1.27-1.78) 1.76 (1.48-2.09) 2.24 (1.88-2.66) 2.68 (2.24-3.20) 3.37 (2.74-4.26) 3.96 (3.12-5.05) 4.60 (3.48-6.02) 5.31 (3.82-7.14) 6.32 (4.35-8.74) 7.16 (4.75-9.95) 2 -day 1.73 (1.47-2.04) 2.03 1 (1.72-2.38) 2.55 (2.16-3.01) 3.02 i (2.54-3.59) 3.74 (3.05-4.65) 4.34 (3.43-5.46) 4.98 (3.79-6.42) 5.67 (4.11-7.52) 6.65 i (4.61-9.07) 7.44 (4.99-10.2) 3 -day 1.90 (1.62-2.22) 2.20 (1.87-2.57) 2.72 (2.31-3.19) 3.20 (2.70-3.77) 3.92 (3.21-4.85) 4.52 (3.60-5.66) 5.17 (3.95-6.63) i 5.86 (4.28-7.74) 6.86 (4.79-9.30) 7.65 (5.17-10.5) -day 24 I.03 (1.74-2.36)I. 2.33 2.87 (2.45-3.36) 3.36 (2.84-3.95) 4.09 (3.36-5.03) 4.69 (3.75-5.84) 6.04 (4.42-7.93) 7.03 (4.93-9.49) 7.82 (5.30-10.7) 7 -day 2.29 (1.97-2.65) 2.67 I (2.30-3.09) 3.31 (2.84-3.84) 3.86 ! (3.28-4.50) 4.64 1 (3.81-5.61) 5.26 (4.21-6.46) 5.90 (4.55-7.43) 6.57 (4.83-8.51) 7.48 1 (5.27-9.98) 8.19 (5.61-11.1) 10 -day 2.52 1(2.18-2.91) 2.96 (2.56-3.41) 3.68 (3.16-4.25) 4.27 (3.65-4.96) 5.73 (4.60-6.97) 6.36 (4.92-7.95) 7.01 (5.18-9.01) i 8.53 (5.87-11.5) 20-da y 3.25 (2.83-3.71) 3.76 (3.27-4.30) 4.58 (3.97-5.25) 5.25 (4.53-6.04) 6.15 (5.09-7.28) 6.83 (5.52-8.21) 7,49 (5.84-9.24 8.15 (6.07-10.3) 9.00 (6.43-11.8) 9.63 (6.70-12.8) 30 -day 3.83 (3.36-4.35) 4.40 (3.85-5.00) 5.31 (4.62-6.05) 6.04 (5.23-6.92) 7.01 (5.83-8.24) 7.74 (6.29-9.24) 8.44 (6.61-10.3) 9.14 (6.84-11.5) 10.0 (7.20-13.0) 10.7 (7.47-14.1) 45 -day 4.54 (3.99-5.13) 5.20 (4.57-5.88) 6.24 (5.47-7.08) 7.08 A (6.16-8.06) 1 8.17 ` (6.82-9.53) 8.98 (7.33-10.6) _ 9.75 (7.67-11.9) 10.5 I7.90-13.1) (ll 11.4 (8.25-14.7) 12.1 (8.52-15.9) -day I.10 560 (4.50-5.74) 77 7.07 8.01 (6.99-9.09) 10.9 (8.64-13.2) 11.7 (8.86-14.6) 13.4 (9.47-17.5) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top PF graphical PADS -based depth -duration -frequency (DDF) (curves Latitude. 40.5179c Longitude: -104.6263° 14 12 10 0 12 ro rti �ru] 'flfif N ("LI +4' >-. >-. p 1}>rID ,q1 ,d1 {1� 1 1 �. i 0 SD uni 0 IN en 71- NOAA Atlas 140Volume 8, Version 2 .10 25 50 100 200 500 1000 Average recurrence interval (years) Created (GrL1TP. Thu Sep 14 2.: 4.1:16 Back to Top Maps & aerials Small scale terrain 1, -1 g: u G J Average recurrence interval (years) S 1 2 5 10 — 25 50 - 100 - 200 0Q I 000 Duration Lion i min 1 in 15 -min 30 -min e2-nr Y • 7r 6-tIr 12 -hr 24 -hr l 2Sy .: 3 -day 4 -day 1 -day de 14 -,day — 20 -day 30 -day — 46 -day 60 -day Large scale terrain r=: •Z; Long �J r rat oIX; 12. 2-P444Z Tits FortCollins • /O45 Longmont B.:wider cneyenne ■ ■rte # ree I ey 100km 60mi - -' ,Denver Large scale map a Fort Cpli n s I Finley 7, Longmont Boulder ,ite s 100km Fir �l 60mi Large scale aerial Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer APPENDIX B-4: HISTORIC RUNOFF CALCULATIONS Irvine Storage Facility Historic Runoff Calculations Basin Basin Area (acres) Basin Imperviousness Runoff Coeficients, c Ltotal Li Si Sw Ti Tt Tc Rainfall Intensity I (in/hr) Basin Flows Q (cfs) POA Area Soil Type A Soil Type B I Soil Type C Soil Type D Road Base (ac) Roof/Structure (ac) Undeveloped (ac) I % 2 Yr 5 Yr 10 Yr 100 Yr (ft) (ft) (ft/ft) (ft/ft) (min) (min) (min) 2 Yr 5 Yr 10 Yr 100 Yr 2 Yr 5 Yr 10 Yr 100 Yr H-1 5.56 2 53 3 03 0.00 0.00 0.00 0.00 5 56 2.0 0.007 0.044 0.122 0.296 351 351 0.018 0.018 29.7 0.0 29.7 1.37 1.82 2.26 4.28 0.05 0.45 1.53 7.05 A H-2 3.22 0.72 2.50 0.00 0.00 0.00 0.00 3.22 2.0 0.008 0.063 0.144 0.330 389 389 0.020 0.020 29.4 0.0 29.4 1.38 1.83 2.27 4.31 0.04 0.37 1.05 4.57 B Basin H-1 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A Soil Type B Soil Type C Soil Type D Composite: 2.53 3.03 0.00 0.00 45.5% 54.5% 0 0% 0 0% 5.56 100% 0.005 0.009 0.010 0.010 0.007 0.000 0.082 0.163 0.163 0.044 0.069 0.165 0.262 0.262 0.122 .217 0.362 0.507 0.507 0.296 Basin H-2 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A Soil Type B Soil Type C Soil Type D Composite: 0.72 2.50 0.00 0.00 22.3% 77.7% 0.0% 0.0% 3.22 100% 0.005 0.009 0.010 0.010 0.008 0.000 0.082 0.163 0.163 0.063 0.069 0.165 0.262 0.262 0.144 0.217 0.362 0.507 0.507 0.330 Site Imperviousness Table I ldeveloped 2 1 Undeveloped 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr 100 Yr P1 0.87 1.15 1.43 2.71 Notes: 1 Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2 Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C 3. H-1 and H-2 areas and soil types are based on the outputs from the NRCS Web Soil Survey and vary slightly from the calculated areas due to rounding. Equations: Tt=Ti+Tt Ti = (0.395*(1.1-05)*Li^0.5) / Si^0.33 C5 = 5 Yr Runoff Coefficient Li = 500 ft maximum Si = average watercourse slope I = (28.5*P 1) / (10+Tc)^0.786 P1 = 1 -hr point rainfall depth Tc = time of conentraction Tt = (Lt -500) / V V = Cv*S^0.5 Cv = Conveyance Coefficient =5, tillage, field (Table RO-2) Sw = average watercourse slope Q = C*I*A C =Runoff Coefficient I =Rainfall Intensity A = Area \\tt.local\IRR\Prolects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.x1s APPENDIX B-5: OFF -SITE RUNOFF CALCULATIONS Irvine Storage Facility Offsite Runoff Calculations Basin Basin Area (acres) Basin Imperviousness Runoff Coeficients, c Ltotal Li Si Sw Ti Tt Tc Rainfall Intensity I (in/hr) Basin Flows Q (cfs) POA Area Soil Type A Soil Type B Soil Type C Soil Type D Gravel Road (ac) Roof/Tank (ac) Undeveloped (ac) I % 2 Yr 5 Yr 10 Yr 100 Yr (ft) (ft) (ft/ft) (ft/ft) (min) (min) (min) 2 Yr 5 Yr 10 Yr 100 Yr 2 Yr 5 Yr 10 Yr 100 Yr OS -1 55.60 39.40 16.30 0.00 0.00 0.00 0.00 55.60 2.0 0.006 0.024 0.097 0.260 3746 500 0.006 0.010 51.42 108.20 159.62 0.44 0.58 0.72 1.37 0.15 0.77 3.91 19.72 C OS -2 12.40 0.50 11.90 0.00 0.00 0.00 0.00 12.40 2.0 0.009 0.078 0.162 0.356 2443 500 0.014 0.016 36.91 52.02 88.94 0.67 0.89 1.10 2.09 0.07 0.86 2.21 9.22 D Basin OS -1 % Impervious 2.0 2 yr 5 yr 10 yr 100 yr Soil Type A 39.40 70.7% 0.01 0.000 0.069 0.217 Soil Type B 16.30 29.3% 0.01 0.082 0.165 0.362 Soil Type C 0.00 0.0% 0.01 0.163 0.262 0.507 Soil Type D 0.00 0.0% 0.01 0.163 0.262 0.507 55.70 100% Modified: 0.006 0.024 0.097 0.260 Basin OS -2 2 yr 5 yr 10 yr 100 yr % Impervious 2.0 Soil Type A 0.50 4.0% 0.01 0.000 0.069 0.217 Soil Type B 11.90 96.0% 0.01 0.082 0.165 0.362 Soil Type C 0.00 0.0% 0.01 0.163 0.262 0.507 Soil Type D 0.00 0.0% 0.01 0.163 0.262 0.507 12.40 100% Modified: 0.009 0.078 0.162 0.356 3.91 Site Imperviousness Table Undeveloped 2 i 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr 100 Yr I P1 I 0.87 I 1.15 I 1.43 2.71 Notes: 1. Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2. Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C 3. OS -1 and OS -2 areas and soil types are based on the outputs from the NRCS Web Soil Survey and vary slightly from the calculated areas due to rounding. Equations: Tt = Ti + Tt Ti = (0.395*(1.1-05)*Li^0.5) / Si^0.33 C5 = 5 Yr Runoff Coefficient L = 500 ft. maximum Si = average watercourse slope Tt = (Ltotal-500) / V V = Cv*S^0.5 Cv = Conveyance Coefficient (Table RO-2) Sw = average watercourse slope I = (28.5*P1) / (10+Tc)^0.786 Q = C*I*A P1 = 1 -hr point rainfall depth Tc = time of conentraction C = Runoff Coefficient I = Rainfall Intensity A=Area \\tt.local\IER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.x1s APPENDIX B-6: DEVELOPED RUNOFF CALCULATIONS Irvine Storage Facility Developed Runoff Calculations Basin Area Soil Type A Yp Basin Area (acres) Soil Type B yp Soil Type C yp Soil Type D yp Road Base ac ( ) Basin Imperviousness Undeveloped/Pond ed/Pond ac p ( ) I % Runoff Coeficients, c 2 Yr 5 Yr 10 Yr 100 Yr Ltotal ( ft Tc 111111 ) ( ) 2 yr Rainfall Intensity I (in/hr) 10 Yr 100 Yr 2 Yr Basin Flows Q (cfs) 5 Yr 10 Yr 100 Yr P A O Roof/Tank ac ( ) 5 Yr ON -1 5.56 2.53 3.03 0.00 0.00 4.28 0.00 1.28 31 0.200 0.228 0.293 0.428 806 14.5 2.01 2.65 3.30 6.26 2.23 3.37 5.38 14.88 E ON -2 3.22 0.72 2.50 0.00 0.00 2.36 0.00 0.86 30 0.199 0.236 0.303 0.448 551 13.1 2.10 2.78 3.46 6.56 1.35 2.11 3.38 9.45 F Site Imperviousness Table Asphalt Roof/Tank Road Base Undeveloped/Pond 100 90 40 2 ION % Impervious -1 31 2 yr .5 yr 10 yr 100 ,yr Soil Type A 2.53 45.5% 0.183 0.198 0.259 0.375 Soil Type B 3.03 54.5% 0.214 0.253 0.322 0.472 Soil 0.00 0.0% 0.223 0.309 0.384 0.569 Type C Soil Type D 0.00 0.0% 0.223 0.309 0.384 0.569 5.56 100% Modified: 0.200 0.228 0.293 0.428 -2 2 yr 5 yr 10 yr 100 yr ION % Impervious 30 Soil Type A 0.72 22.3% 0.175 0.192 0.254 0.371 Soil Type B 2.50 77.7% 0.206 0.248 0.317 0.469 Soil Type C 0.00 0.0% 0.215 0.305 0.381 0.568 Soil Type D 0.00 0.0% 0.215 0.305 0.381 0.568 3.22 100% Modified: 0.199 0.236 0.303 0.448 1 -hour Point Rainfall Depth 2 Yr 5 Yr 10 Yr P1 0.87 1.15 1.43 100 Yr I 2.71 Notes: 1. Refer to Weld County Engineering & Construction Criteria Table 5-2 for Site Imperviousness. Historic flow analysis = 2% imperviousness. 2. Refer to Urban Drainage Criteria Manual Vol. 1 Table RO-5 (2 Yr) and Weld County Engineering and Construction Criteria Tables 5-3 through 5-5 (all other values) for Runoff Coefficients, C Equations: Tc = L/180+10 I = (28.5 *P 1) / (10+Tc)^0.786 P1 = 1 -hr point rainfall depth Tc = time of conentraction Q = C*I*A C = Runoff Coefficient I = Rainfall Intensity A = Area \\tt.local\IER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWe1dC111524.11s APPENDIX C: HYDRAULIC CALCULATIONS APPENDIX C-1: PIPE AND CULVERT CALCULATIONS Culvert Calculator Report North Channel Culvert Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 4,824.17 ft 4,824.27 ft 4,823.77 ft 4,824.27 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 1.40 14.88 cfs 4,823.04 ft Outlet Control Grades Upstream Invert Length 4,822.17 ft 43.00 ft Downstream Invert Constructed Slope 4,821.96 ft 0.005000 ft/ft Hydraulic Profile Profile CompositeM2PressureProfile Slope Type Flow Regime Velocity Downstream Mild Subcritical 5.46 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 1.08 ft N/A ft 1.06 ft 0.023997 ft/ft Section Section Shape Section Material Section Size Number Sections Circular CMP 18 inch 2 Mannings Coefficient Span Rise 0.024 1.50 ft 1.50 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,824.27 ft 0.20 Upstream Velocity Head Entrance Loss 0.28 ft 0.06 ft Inlet Control Properties Inlet Control HW Elev. 4,823.77 ft Inlet Tpeled ring, 33.7° (1.5:1) bevels K 0.00180 M 2.50000 C 0.02430 Y 0.83000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 3.5 ft2 3 B 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 09:45:1 SNBNentley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Culvert Calculator Report North Pond Outlet Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 0.00 ft 4,821.55 ft 4,821.49 ft 4,821.55 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 0.83 1.53 cfs 0.00 ft Outlet Control Grades Upstream Invert Length 4,820.72 ft 43.20 ft Downstream Invert Constructed Slope 4,820.50 ft 0.005000 ft/ft Hydraulic Profile Profile Slope Type Flow Regime Velocity Downstream M2 Mild Subcritical 3.67 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 0.52 ft 0.56 ft 0.52 ft 0.006279 ft/ft Section Section Shape Section Material Section Size Number Sections Circular Concrete 12 inch 1 Mannings Coefficient Span Rise 0.013 1.00 ft 1.00 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,821.55 ft 0.50 Upstream Velocity Head Entrance Loss 0.18 ft 0.09 ft Inlet Control Properties Inlet Control HW Elev. 4,821.49 ft Inlet Type Square edge w/headwall K 0.00980 M 2.00000 C 0.03980 Y 0.67000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 0.8 ft2 1 1 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 10:07:4WkB\entley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Culvert Calculator Report South Pond Outlet Solve For: Headwater Elevation Culvert Summary Allowable HW Elevation Computed Headwater Flew Inlet Control HW Elev. Outlet Control HW Elev. 0.00 ft 4,823.17 ft 4,823.10 ft 4,823.17 ft Headwater Depth/Height Discharge Tailwater Elevation Control Type 0.68 1.05 cfs 0.00 ft Entrance Control Grades Upstream Invert Length 4,822.49 ft 43.00 ft Downstream Invert Constructed Slope 4,822.00 ft 0.011419 ft/ft Hydraulic Profile Profile Slope Type Flow Regime Velocity Downstream S2 Steep Supercritical 4.14 ft/s Depth, Downstream Normal Depth Critical Depth Critical Slope 0.36 ft 0.36 ft 0.43 ft 0.005835 ft/ft Section Section Shape Section Material Section Size Number Sections Circular Concrete 12 inch 1 Mannings Coefficient Span Rise 0.013 1.00 ft 1.00 ft Outlet Control Properties Outlet Control HW Elev. Ke 4,823.17 ft 0.50 Upstream Velocity Head Entrance Loss 0.16 ft 0.08 ft Inlet Control Properties Inlet Control HW Elev. 4,823.10 ft Inlet Type Square edge w/headwall K 0.00980 M 2.00000 C 0.03980 Y 0.67000 Flow Control Area Full HDS 5 Chart HDS 5 Scale Equation Form Unsubmerged 0.8 ft2 1 1 1 ...\calcs\ditches&culverts\project1. cvm 11/15/24 10:21:1 1JABentley Systems, Incorporated Tetra Tech, Inc. Project Engineer: ALEXI.COPELAND@tetratech.com CulvertMaster v10.3 [10.03.00.03] Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 APPENDIX C-2: DRAINAGE CHANNEL CALCULATIONS Worksheet for North Trapezoidal Channe1111524 -1 Project Description Friction Method Solve For Manning Formula Normal Depth Input Data Roughness Coefficient Channel Slope Left Side Slope Right Side Slope Bottom Width Discharge 0.035 0.005 ft/ft 4.000 H :V 4.000 H :V 2.00 ft 14.88 cfs Results Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type 12.9 in 6.8 ft2 10.9 ft 7.5 in 10.61 ft 9.1 in 0.024 ft/ft 2.19 ft/s 0.07 ft 1.15 ft 0.483 Subcritical GVF Input Data Downstream Depth Length Number Of Steps 0.0 in 0.0 ft 0 GVF Output Data Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope 0.0 in N/A 0.00 ft 0.00 ft/s 0.00 ft/s 12.9 in 9.1 in 0.005 ft/ft 0.024 ft/ft Ditches.fm8 11/15/2024 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 FlowMaster [10.03.00.03] Page 1 of 1 Worksheet for South Trapezoidal Channe1111524 - 1 Project Description Friction Method Solve For Manning Formula Normal Depth Input Data Roughness Coefficient Channel Slope Left Side Slope Right Side Slope Bottom Width Discharge 0.035 0.005 ft/ft 4.000 H :V 4.000 H :V 2.00 ft 9.45 cfs Results Normal Depth Flow Area Wetted Perimeter Hydraulic Radius Top Width Critical Depth Critical Slope Velocity Velocity Head Specific Energy Froude Number Flow Type 10.5 in 4.8 ft2 9.2 ft 6.3 in 9.03 ft 7.2 in 0.025 ft/ft 1.95 ft/s 0.06 ft 0.94 ft 0.470 Subcritical GVF Input Data Downstream Depth Length Number Of Steps 0.0 in 0.0 ft 0 GVF Output Data Upstream Depth Profile Description Profile Headloss Downstream Velocity Upstream Velocity Normal Depth Critical Depth Channel Slope Critical Slope 0.0 in N/A 0.00 ft 0.00 ft/s 0.00 ft/s 10.5 in 7.2 in 0.005 ft/ft 0.025 ft/ft Ditches.fm8 11/15/2024 Bentley Systems, Inc. Haestad Methods Solution Center 27 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 FlowMaster [10.03.00.03] Page 1 of 1 APPENDIX C-3: DRAINAGE CALCULATIONS Irvine Storage Facility Culvert Runoff Calculations CULVERT ID Contributing Basins 10-,yr (cfs) 100-yr (cfs) � EL: Inv. In Inv. Out Velocityloo (ft/s) Pipe Dia. (in) ON -1 5.38 14.88 4824.27 4822.17 4821.96 5.46 18 NORTH CHANNEL CULVERTS NORTH POND OUTLET ON -1 -- 1.53 NA 4820.72 4820.50 3.67 12 ON -2 -- 1.05 NA 4822.49 4822.00 4.14 12 SOUTH POND OUTLET Riprap Apron Calculations at Culvert Outlets STRUCTURE ID Pipe (ft) O, D Discharge per Barrel, Qmo (cfs) Tailwater Allowable Type of Rip Rap Depth Expansion Factor Length of Rip Rap Check Width * 2 d50 (in) 2 s Q/D 1/(2*tan8) ( Fi re 9-35) At (ft' ) Length (ft) * ,� 3 D (Min.) 10*D (Max) Use 8 T (Radians) (ft) , Yt/D 15 Q/D Rip Rap (Figure 9-3 8 ( ) cis() Equation g_ 11 (in) Use (in) ., Depth, p (ft) Yt Velocity, V ty, (ft/sec) (ft) (ft) (ft) 1.5 7.44 1.08 3.00 0.72 4.05 TYPE L 2 9 18 2.7 6.7 2.5 5.4 4.5 15 10 Extend to Height of Pipe NORTH CHANNEL CULVERTS NORTH POND OUTLET 1 1.5 3 0.5 2 = 3.00 0.5 2 = 1.5 3 TYPE L * * 1 9 18 1.5 6.7 0.5 -0.1 3 10 6 0.074 2 SOUTH POND OUTLET - 1 1.05 0.34 _ 3.00 0.34 1.05 TYPE L** 1 9 18 1.1 6.2 .. 0.4 0.2 3 10 6 0.080 2 L** - Use Type L for a Distance of 3*D Downstream, Urban Drainage, Drainage Criteria Manual, Volume 1, Figure MD -21, No Further Calculations Required Ditch Calculations Contributing Basins .. 10-yr 100-yr (cfs) (cfs) _ Type _ Side Slopes Channel Slope Depth 1 of Flow (ft) Req'd Freeboard Depth (ft) + Planned Min. Depth 1 (ft) Velocity (ft/s) ` ... Roughness g Coefficient Froude # Hydr. Radius (ft) Shear (psi) Erosion Control Ditch ID .. North Channel ON -1 5.38 14.88 Trapezoidal Ditch, 2' Bottom Width 4:1 0.5% _ 1.075 2.075 3 2.19 0.035 0.483 0.625 _ 0.20 TRM/VEG South Channel ON -2 3.38 9.45 Trapezoidal Ditch, 2' Bottom Width 4:1 0.5% 0.875 1.875 3 1.95 0.035 0.470 0.525 0.16 TRM/VEG \\tt.local\TER\Projects\Longmont\7116\117-7116003\SupportDocs\Calcs\RunoffCalcs\Runoff Irvine_UpdateWeldC111524.x1s APPENDIX C-4: DETENTION POND CALCULATIONS DETENTION BASIN STAGE -STORAGE TABLE BUILDER MHFD-Detention, Version 4.06 (July 2022) Project: Irvine Storage Basin ID: North Pond 144-YR VOLUME. EURVT WQCV PERMANENT POOL Watershed Information ZONE 3 ZONE 2 ZONE 1 ZION E * API Q 2 ORIFICES 144 -YEAR ORIFICE Example Zone Configuration (Retention Pond) Selected BMP Type = Watershed Area = Watershed Length = Watershed Length to Centroid = Watershed Slope = Watershed Imperviousness = Percentage Hydrologic Soil Group A = Percentage Hydrologic Soil Group B = Percentage Hydrologic Soil Groups C/D = Target WQCV Drain Time = Location for 1 -hr Rainfall Depths = Erie EDB 5.56 806 100 0.011 31.00% 45.5% 54.5% 0.0% 40.0 acres ft ft ft/ft percent percent percent percent hours After providing required inputs above including 1 -hour rainfall depths, click 'Run CUHP to generate runoff hydrographs using the embedded Colorado Urban Hydrograph Procedure. Water Quality Capture Volume (WQCV) _ Excess Urban Runoff Volume (EURV) _ 2-yr Runoff Volume (P1 = 0.87 in.) _ 5-yr Runoff Volume (P1 = 1.15 in.) _ 10-yr Runoff Volume (P1 = 1.43 in.) _ 25-yr Runoff Volume (P1 = 1.87 in.) _ 50-yr Runoff Volume (P1 = 2.27 in.) _ 100-yr Runoff Volume (P1 = 2.71 in.) _ 500-yr Runoff Volume (P1 = 3.92 in.) _ Approximate 2-yr Detention Volume = Approximate 5-yr Detention Volume = Approximate 10-yr Detention Volume = Approximate 25-yr Detention Volume = Approximate 50-yr Detention Volume = Approximate 100-yr Detention Volume = Define Zones and Basin Geometry Zone 1 Volume (WQCV) _ Zone 2 Volume (100 -year - Zone 1) _ Select Zone 3 Storage Volume (Optional) _ Total Detention Basin Volume = Initial Surcharge Volume (ISV) _ Initial Surcharge Depth (ISD) _ Total Available Detention Depth (Htotai) _ Depth of Trickle Channel (HTc) _ Slope of Trickle Channel (STc) _ Slopes of Main Basin Sides (Smain) _ Basin Length -to -Width Ratio (Rvw) _ Initial Surcharge Area (Amv) _ Surcharge Volume Length 0-mv) _ Surcharge Volume Width (Wmv) _ Depth of Basin Floor (HFLooR) _ Length of Basin Floor (LFLooR) _ Width of Basin Floor (WFLooR) _ Area of Basin Floor (AFLooR) _ Volume of Basin Floor (VFLooR) _ Depth of Main Basin (HMAIN) _ Length of Main Basin (LMAIN) _ Width of Main Basin (WMAIN) _ Area of Main Basin (AMAIN) _ Volume of Main Basin (VMAIN) _ Calculated Total Basin Volume (Vtotai) _ 0.072 0.176 0.086 0.128 0.182 0.374 0.533 0.755 1.292 0.087 0.127 0.185 0.252 0.297 0.378 0.072 0.306 0.378 user user user user user user user user user user user user user user user user user user user user user acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet ft 3 ft ft ft ft/ft H:V ft 2 ft ft ft ft ft ftZ ft 3 ft ft ft ftZ ft 3 acre-feet Optional User Overrides acre-feet acre-feet inches inches inches inches inches inches inches 0.87 1.15 1.43 1.87 2.27 2.71 3.92 Depth Increment = 0.10 ft Stage - Storage Description Stage (ft) Optional Override Stage (ft) Length (ft) Width (ft) Area (ft 2) Area optional Override (ft 2) Area (acre) Volume (ft 3) Volume (ac -ft) Top of Micropool -- 0.00 -- -- -- 44 0.001 -- 0.10 -- -- -- 305 0.007 17 0.000 -- 0.20 -- -- -- 798 0.018 73 0.002 -- 0.30 -- -- -- 1,522 0.035 188 0.004 -- 0.40 -- -- -- 2,476 0.057 388 0.009 -- 0.50 -- -- -- 3,661 0.084 695 0.016 -- 0.60 -- -- -- 5,075 0.117 1,132 0.026 -- 0.70 -- -- -- 6,719 0.154 1,722 0.040 -- 0.80 -- -- -- 8,593 0.197 2,487 0.057 -- 0.90 -- -- -- 10,697 0.246 3,452 0.079 -- 1.00 -- -- -- 11,094 0.255 4,541 0.104 -- 1.10 -- -- -- 11,295 0.259 5,661 0.130 -- 1.20 -- -- -- 11,497 0.264 6,800 0.156 -- 1.30 -- -- -- 11,700 0.269 7,960 0.183 -- 1.40 -- -- -- 11,905 0.273 9,140 0.210 -- 1.50 -- -- -- 12,110 0.278 10,341 0.237 -- 1.60 -- -- -- 12,316 0.283 11,562 0.265 -- 1.70 -- -- -- 12,523 0.287 12,804 0.294 -- 1.80 -- -- -- 12,731 0.292 14,067 0.323 -- 1.90 -- -- -- 12,940 0.297 15,351 0.352 -- 2.00 -- -- -- 13,150 0.302 16,655 0.382 -- 2.10 -- -- -- 13,361 0.307 17,981 0.413 -- 2.20 -- -- -- 13,573 0.312 19,327 0.444 -- 2.30 -- -- -- 13,786 0.316 20,695 0.475 -- 2.40 -- -- -- 14,000 0.321 22,085 0.507 -- 2.50 -- -- -- 14,215 0.326 23,495 0.539 -- 2.60 -- -- -- 14,431 0.331 24,928 0.572 -- 2.70 -- -- -- 14,648 0.336 26,382 0.606 -- 2.80 -- -- -- 14,866 0.341 27,857 0.640 -- 2.90 -- -- -- 15,085 0.346 29,355 0.674 -- 3.00 -- -- -- 15,304 0.351 30,874 0.709 -- 3.10 -- -- -- 15,525 0.356 32,416 0.744 -- 3.20 -- -- -- 15,747 0.362 33,979 0.780 -- 3.30 -- -- -- 15,970 0.367 35,565 0.816 -- 3.40 -- -- -- 16,193 0.372 37,173 0.853 -- 3.50 -- -- -- 16,418 0.377 38,804 0.891 -- 3.60 -- -- -- 16,644 0.382 40,457 0.929 -- 3.70 -- -- -- 16,870 0.387 42,133 0.967 -- 3.80 -- -- -- 17,098 0.393 43,831 1.006 -- 3.90 -- -- -- 17,326 0.398 45,552 1.046 -- 4.00 -- -- -- 17,556 0.403 47,296 1.086 -- 4.10 -- -- -- 17,786 0.408 49,063 1.126 -- 4.20 -- -- -- 18,017 0.414 50,854 1.167 -- 4.30 -- -- -- 18,249 0.419 52,667 1.209 -- 4.40 -- -- -- 18,482 0.424 54,503 1.251 -- 4.50 -- -- -- 18,715 0.430 56,363 1.294 MHFD-Detention_v4-06 - North111524.xlsm, Basin 11/15/2024, 10:48 AM DETENTION BASIN STAGE -STORAGE TABLE BUILDER MHFD-Detention, Version 4.06 (July 2022) 0.1 20 15 10 18800 14100 9400 4700 0 .... 4 a ..�: ttl 2 L s a t 5 }� c a) J 0 0.00 I 1.50 Length (ft) 3.00 Stage Width (ft) (ft) Area (sq.ft.) 4.50 6.00 0.440 0.330 0.220 0.110 0.000 - 1.300 6 fa . 0.975 0.650 H E' L V a m L 2 Q v E 7 0.325 - 0.000 0.00 1.50 3.00 Stage (acres) (ft.) Volume (ac -ft) 4.50 6.00 Area MHFD-Detention v4-06 - North111524.xlsm, Basin 11/15/2024, 10:48 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) Project: Irvine Storage Basin ID: North Pond [ZONE 2 (-ZONE 1 16CFYFi VOLUME EUAVTj wocY� .•'ir PERMANENT POOL ZONE 1 AND 2'' °ROC ES 100 -YEAR ORIFICE Example Zone Configuration (Retention Pond) Zone 1 (WQCV) Zone 2 (100 -year) Zone 3 User Input: Orifice at Underdrain Outlet (typically used to drain WQCV in a Filtration BMP) Underdrain Orifice Invert Depth = Underdrain Orifice Diameter = N/A N/A Estimated Stage (ft) Estimated Volume (ac -ft) Outlet Type 0.87 0.072 Orifice Plate 1.99 0.306 Weir&Pipe (Restrict) Total (all zones) 0.378 ft (distance below the filtration media surface) inches Underdrain Orifice Area = Underdrain Orifice Centroid = Calculated Parameters for Underdrain ft2 feet N/A N/A User Input: Orifice Plate with one or more orifices or Elliptical Slot Weir (typically used to drain WQCV and/or EURV in a sedimentation BMP) Centroid of Lowest Orifice = Depth at top of Zone using Orifice Plate = Orifice Plate: Orifice Vertical Spacing = Orifice Plate: Orifice Area per Row = 0.00 2.50 N/A 0.44 ft (relative to basin bottom at Stage = 0 ft) ft (relative to basin bottom at Stage = 0 ft) inches sq. inches (diameter = 3/4 inch) User Input: Stage and Total Area of Each Orifice Row (numbered from lowest to highest) Stage of Orifice Centroid (ft) Orifice Area (sq. inches) Stage of Orifice Centroid (ft) Orifice Area (sq. inches) WQ Orifice Area per Row = Elliptical Half -Width = Elliptical Slot Centroid = Elliptical Slot Area = 3.056E-03 N/A N/A N/A Calculated Parameters for Plate ft2 feet feet ft2 Row 1 (required) Row 2 (optional) Row 3 (optional) Row 4 (optional) Row 5 (optional) Row 6 (optional) Row 7 (optional) Row 8 (optional) 0.00 0.30 0.60 0.90 1.20 1.50 1.80 2.10 0.44 0.44 0.44 0.44 0.44 0.44 0.44 0.44 Row 9 (optional) Row 10 (optional) Row 11 (optional) Row 12 (optional) Row 13 (optional) Row 14 (optional) Row 15 (optional) Row 16 (optional) User Input: Vertical Orifice (Circular or Rectangular) Invert of Vertical Orifice = Depth at top of Zone using Vertical Orifice = Vertical Orifice Diameter = Not Selected Not Selected N/A N/A N/A N/A N/A N/A ft (relative to basin bottom at Stage = 0 ft) ft (relative to basin bottom at Stage = 0 ft) inches Vertical Orifice Area = Vertical Orifice Centroid = Calculated Parameters for Vertical Orifice Not Selected Not Selected N/A N/A N/A N/A ft2 feet User Input: Overflow Weir (Dropbox with Flat or Sloped Grat Overflow Weir Front Edge Height, Ho = Overflow Weir Front Edge Length = Overflow Weir Grate Slope = Hartz. Length of Weir Sides = Overflow Grate Type = Debris Clogging % _ e and Outlet Pipe OR Rectangular/Trapezoidal Weir and No Outlet Pipe) Zone 2 Weir Not Selected 2.50 N/A 4.00 N/A 0.00 N/A 4.00 N/A N/A Type C Grate 50% N/A ft (relative to basin bottom at Stage = 0 ft) Height of Grate Upper Edge, Ht = feet H:V feet Ok User Input: Outlet Pipe w/ Flow Restriction Plate (Circular Orifice, Restnctor Plate, or Rectangular Orifice) Depth to Invert of Outlet Pipe = Outlet Pipe Diameter = Restrictor Plate Height Above Pipe Invert = Zone 2 Restnctor Not Selected 0.00 N/A 12.00 N/A 3.55 User Input: Emergency Spillway (Rectangular or Trapezoidal) Spillway Invert Stage= Spillway Crest Length = Spillway End Slopes = Freeboard above Max Water Surface = 3.00 11.00 4.00 1.00 Overflow Weir Slope Length = Grate Open Area / 100-yr Orifice Area = Overflow Grate Open Area w/o Debris = Overflow Grate Open Area w/ Debris = ft (distance below basin bottom at Stage = 0 ft) inches inches ft (relative to basin bottom at Stage = 0 ft) feet H:V feet Calculated Parameters for Overflow Weir Zone 2 Weir Not Selected 2.50 N/A 4.00 N/A 57.30 N/A 11.14 N/A 5.57 N/A feet feet ft2 ft2 Calculated Parameters for Outlet Pipe w/ Flow Restriction Plate Outlet Orifice Area = Outlet Orifice Centroid = Half -Central Angle of Restnctor Plate on Pipe = Spillway Design Flow Depth= Stage at Top of Freeboard = Basin Area at Top of Freeboard = Basin Volume at Top of Freeboard = Zone 2 Restrictor Not Selected 0.19 N/A 0.17 N/A 1.15 N/A Calculated Parameters for Spillway feet feet acres acre -ft 0.49 4.49 0.43 1.29 ft2 feet radians Routed Hydrograph Results Design Storm Return Period = One -Hour Rainfall Depth (in) _ CUHP Runoff Volume (acre -ft) _ Inflow Hydrograph Volume (acre -ft) _ CUHP Predevelopment Peak Q (cfs) _ OPTIONAL Override Predevelopment Peak Q (cfs) _ Predevelopment Unit Peak Flow, q (cfs/acre) _ Peak Inflow Q (cfs) _ Peak Outflow Q (cfs) _ Ratio Peak Outflow to Predevelopment Q = Structure Controlling Flow = Max Velocity through Grate 1 (fps) _ Max Velocity through Grate 2 (fps) _ Time to Drain 97% of Inflow Volume (hours) _ Time to Drain 99% of Inflow Volume (hours) _ Maximum Ponding Depth (ft) _ Area at Maximum Ponding Depth (acres) _ Maximum Volume Stored (acre -ft) _ The user can override the default CUHP hydro graphs and runoff volumes by entering new values in the Inflow Hydro rats table (Columns W through AF). WQCV EURV 2 Year 5 Year 10 Year 25 Year 50 Year 100 Year 500 Year N/A N/A 0.87 1.15 1.43 1.87 2.27 2.71 3.92 0.072 0.176 0.086 0.128 0.182 0.374 0.533 0.755 1.292 N/A N/A 0.086 0.128 0.182 0.374 0.533 0.755 1.292 N/A N/A 0.0 0.1 0.3 3.6 6.0 9.0 16.1 N/A N/A 0.5 1.5 7.1 N/A N/A 0.01 0.08 0.28 0.65 1.08 1.27 2.90 N/A N/A 1.3 2.0 2.9 6.6 9.5 13.2 22.1 0.0 0.1 0.0 0.0 0.1 0.1 0.1 1.5 10.2 N/A N/A N/A 0.1 0.0 0.0 0.0 0.2 0.6 Plate Plate Plate Plate Plate Plate Plate Outlet Plate 1 Spillway N/A N/A N/A N/A N/A N/A N/A 0.1 0.1 N/A N/A N/A N/A N/A N/A N/A N/A N/A 41 65 45 56 67 92 104 103 96 43 70 49 60 72 99 113 115 111 0.87 1.28 0.90 1.06 1.26 1.92 2.42 2.84 3.38 0.23 0.27 0.25 0.26 0.27 0.30 0.32 0.34 0.37 0.072 0.177 0.079 0.120 0.172 0.358 0.513 0.653 0.842 MHFD-Detention v4-06 - North111524.xlsm, Outlet Structure 11/15/2024, 10:48 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) 25 S00YR IN 500YR OUT - 100YR IN •••• 100YR OUT 20 50YR IN - - - - 50YR OUT f 25YR IN - - - - r 25YR OUT — 10YR IN 15 . ° 10YR OUT — 5YR IN N 4- — u 5YR OUT ® — 2YR IN J LL — a . a • 2YR OUT 10 1 ' EURV IN • .• • • • •F EURV OUT - • • • ' WQCV IN - • • • i WQCV OUT • • • 5 • • • • • • ea • • ••••• _. i', - • .... .. ..SYl' . ...• -..- al TIME [hr] 1 10 4 3.5 S00YR 100YR 50YR c- 25YR IM 10YR E 5YR 3 — im 2YR Gs EURV WQCV ,2.5— u 2 I- 0 - w el 2 0 Z 0 O a 1.5 1 0.5 / � 0 0.1 1 DRAIN TIME [hr] 10 100 90 60,000 User Interpolated Area [ft^2] Area [ft^2] 50,000 Summary Area [ft^2] - 80 Volume --oa -° Summary Outflow [ft^3] Volume [ft^3] - 70 40,000 [cfs] 60 --1i Summary Outflow [cfs] M < 4.4 0.1 u N - 50 It u inj� 30,000 O O N < a..• 0.1 u 20,000 - 40 O 30 - :5 ce - 20 e,• 10,000 - 10 0 0.00 i 1.00 2.00 PONDING 3.00 DEPTH [ft] 4.00 5.00 6.00 0 S -A -V -D Chart Axis Override minimum bound maximum bound X-axis Left Y -Axis Right Y -Axis MHFD-Detention v4-06 - North111524.xlsm, Outlet Structure 11/15/2024, 10:48 AM DETENTION BASIN OUTLET STRUCTURE DESIGN Time Interval 5.00 min Outflow Hydrograph Workbook Filename: Inflow Hydrographs The user can override the calculated inflow hydrographs from this workbook with inflow hydrographs developed in a separate program. SOURCE CUHP CUHP CUHP CUHP CUHP CUHP CUHP CUHP CUHP TIME WQCV [cfs] EURV [cfs] 2 Year [cfs] 5 Year [cfs] 10 Year [cfs] 25 Year [cfs] 50 Year [cfs] 100 Year [cfs] 500 Year [cfs] 0:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.15 0:15:00 0.00 0.00 0.06 0.16 0.25 0.22 0.32 0.35 0.61 0:20:00 0.00 0.00 0.39 0.58 0.76 0.57 0.74 0.87 1.81 0:25:00 0.00 0.00 0.98 1.64 2.37 1.55 2.21 2.72 6.62 0:30:00 0.00 0.00 1.33 2.04 2.90 5.23 7.98 10.63 18.57 0:35:00 0.00 0.00 1.24 1.87 2.63 6.56 9.51 13.24 22.08 0:40:00 0.00 0.00 1.09 1.63 2.28 6.49 9.26 12.72 21.04 0:45:00 0.00 0.00 0.94 1.41 2.00 5.65 8.10 11.56 19.15 0:50:00 0.00 0.00 0.82 1.24 1.72 5.06 7.28 10.33 17.11 0:55:00 0.00 0.00 0.70 1.05 1.48 4.21 6.01 8.88 14.75 1:00:00 0.00 0.00 0.62 0.91 1.30 3.46 4.90 7.59 12.77 1:05:00 0.00 0.00 0.56 0.81 1.19 2.92 4.18 6.80 11.56 1:10:00 0.00 0.00 0.49 0.74 1.10 2.46 3.51 5.58 9.52 1:15:00 0.00 0.00 0.43 0.65 1.01 2.09 2.95 4.54 7.77 1:20:00 0.00 0.00 0.38 0.56 0.87 1.69 2.37 3.52 5.98 1:25:00 0.00 0.00 0.33 0.48 0.70 1.33 1.85 2.64 4.42 1:30:00 0.00 0.00 0.28 0.41 0.56 0.98 1.34 1.85 3.11 1:35:00 0.00 0.00 0.24 0.36 0.48 0.70 0.95 1.29 2.25 1:40:00 0.00 0.00 0.23 0.31 0.44 0.55 0.73 0.97 1.74 1:45:00 0.00 0.00 0.22 0.28 0.40 0.45 0.60 0.76 1.40 1:50:00 0.00 0.00 0.21 0.26 0.38 0.40 0.52 0.62 1.16 1:55:00 0.00 0.00 0.19 0.25 0.36 0.37 0.46 0.52 0.99 2:00:00 0.00 0.00 0.17 0.23 0.32 0.34 0.43 0.45 0.87 2:05:00 0.00 0.00 0.13 0.18 0.25 0.26 0.32 0.32 0.62 2:10:00 0.00 0.00 0.10 0.14 0.19 0.19 0.24 0.23 0.45 2:15:00 0.00 0.00 0.08 0.10 0.14 0.14 0.18 0.17 0.33 2:20:00 0.00 0.00 0.06 0.08 0.10 0.11 0.13 0.13 0.24 2:25:00 0.00 0.00 0.04 0.06 0.07 0.08 0.09 0.09 0.18 2:30:00 0.00 0.00 0.03 0.04 0.05 0.06 0.07 0.07 0.13 2:35:00 0.00 0.00 0.02 0.03 0.04 0.04 0.05 0.05 0.09 2:40:00 0.00 0.00 0.02 0.02 0.03 0.03 0.03 0.03 0.06 2:45:00 0.00 0.00 0.01 0.01 0.02 0.02 0.02 0.02 0.04 2:50:00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.02 2:55:00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 3:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MHFD-Detention v4-06 - North111524.xlsm, Outlet Structure 11/15/2024, 10:48 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) Summary Stage -Area -Volume -Discharge Relationships The user can create a summary S -A -V -D by entering the desired stage increments and the remainder of the table will populate automatically. The user should graphically compare the summary S -A -V -D table to the full S -A -V -D table in the chart to confirm it captures all key transition points. Stage - Storage Description Stage [ft] Area z [ft ] Area [acres] Volume s [ft ] Volume [ac -ft] Total Outflow [cfs] For best results, include slope ISV and table inverts and on orifice, spillway, the Floor) of all stages of all grade changes (e.g. from the S -A -V Sheet Basin'. Also Include the outlets (e.g. vertical overflow grate, where applicable). MHFD-Detention v4-06 - North111524.xlsm, Outlet Structure 11/15/2024, 10:48 AM DETENTION BASIN STAGE -STORAGE TABLE BUILDER MHFD-Detention, Version 4.06 (July 2022) Project: I rvine Storage Basin I D: South Pond 144-YR VOLUM-Er EURVT WQCV PERMANENT POOL Watershed Information ZONE 3 ZONE 2 r -ZONE 1 ZONE * AIdQ 2 ORIFICES 144 -YEAR ORIFICE Example Zone Configuration (Retention Pond) Selected BMP Type = Watershed Area = Watershed Length = Watershed Length to Centroid = Watershed Slope = Watershed Imperviousness = Percentage Hydrologic Soil Group A = Percentage Hydrologic Soil Group B = Percentage Hydrologic Soil Groups C/D = Target WQCV Drain Time = Location for 1 -hr Rainfall Depths = Erie EDB 3.22 551 100 0.011 30.00% 22.3% 77.7% 0.0% 40.0 acres ft ft ft/ft percent percent percent percent hours After providing required inputs above including 1 -hour rainfall depths, click 'Run CUHP to generate runoff hydrographs using the embedded Colorado Urban Hydrograph Procedure. Water Quality Capture Volume (WQCV) _ Excess Urban Runoff Volume (EURV) _ 2-yr Runoff Volume (P1 = 0.87 in.) _ 5-yr Runoff Volume (P1 = 1.15 in.) _ 10-yr Runoff Volume (P1 = 1.43 in.) _ 25-yr Runoff Volume (P1 = 1.87 in.) _ 50-yr Runoff Volume (P1 = 2.27 in.) _ 100-yr Runoff Volume (P1 = 2.71 in.) _ 500-yr Runoff Volume (P1 = 3.92 in.) _ Approximate 2-yr Detention Volume = Approximate 5-yr Detention Volume = Approximate 10-yr Detention Volume = Approximate 25-yr Detention Volume = Approximate 50-yr Detention Volume = Approximate 100-yr Detention Volume = Define Zones and Basin Geometry Zone 1 Volume (WQCV) _ Zone 2 Volume (100 -year - Zone 1) _ Select Zone 3 Storage Volume (Optional) _ Total Detention Basin Volume = Initial Surcharge Volume (ISV) _ Initial Surcharge Depth (ISD) _ Total Available Detention Depth (Htotai) _ Depth of Trickle Channel (H -m) _ Slope of Trickle Channel (S-ic) _ Slopes of Main Basin Sides (Smain) _ Basin Length -to -Width Ratio (Rvw) _ Initial Surcharge Area (Aisv) _ Surcharge Volume Length (-Isv) _ Surcharge Volume Width (Wlsv) _ Depth of Basin Floor (HFLooR) _ Length of Basin Floor (LFLooR) _ Width of Basin Floor (WFLooR) _ Area of Basin Floor (AFLooR) _ Volume of Basin Floor (VFLooR) _ Depth of Main Basin (HMAIN) _ Length of Main Basin (-MAIN) _ Width of Main Basin (WMAIN) _ Area of Main Basin (AMAIN) _ Volume of Main Basin (VMAIN) _ Calculated Total Basin Volume (Vtotai) _ 0.041 0.099 0.051 0.076 0.120 0.239 0.337 0.466 0.784 0.050 0.074 0.112 0.151 0.175 0.222 0.041 0.181 0.222 user user user user user user user user user user user user user user user user user user user user user acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet acre-feet ft 3 ft ft ft ft/ft H:V ft 2 ft ft ft ft ft ftZ ft 3 ft ft ft ftZ ft 3 acre-feet Optional User Overrides acre-feet acre-feet inches inches inches inches inches inches inches 0.87 1.15 1.43 1.87 2.27 2.71 3.92 Depth Increment = 0.10 ft Stage - Storage Description Stage (ft) Optional Override Stage (ft) Length (ft) Width (ft) Area (ft 2) Area Optional Override (ft 2) Area (acre) Volume (ft 3) Volume (ac -ft) Top of Micropool -- 0.00 -- -- -- 2 0.000 -- 0.10 -- -- -- 180 0.004 9 0.000 -- 0.20 -- -- -- 649 0.015 50 0.001 -- 0.30 -- -- -- 1,404 0.032 153 0.004 -- 0.40 -- -- -- 2,445 0.056 346 0.008 -- 0.50 -- -- -- 3,773 0.087 656 0.015 -- 0.60 -- -- -- 5,386 0.124 1,114 0.026 -- 0.70 -- -- -- 7,285 0.167 1,748 0.040 -- 0.80 -- -- -- 8,254 0.189 2,525 0.058 -- 0.90 -- -- -- 8,439 0.194 3,360 0.077 -- 1.00 -- -- -- 8,625 0.198 4,213 0.097 -- 1.10 -- -- -- 8,812 0.202 5,085 0.117 -- 1.20 -- -- -- 9,000 0.207 5,975 0.137 -- 1.30 -- -- -- 9,189 0.211 6,885 0.158 -- 1.40 -- -- -- 9,377 0.215 7,813 0.179 -- 1.50 -- -- -- 9,568 0.220 8,760 0.201 -- 1.60 -- -- -- 9,759 0.224 9,727 0.223 -- 1.70 -- -- -- 9,952 0.228 10,712 0.246 -- 1.80 -- -- -- 10,146 0.233 11,717 0.269 -- 1.90 -- -- -- 10,340 0.237 12,741 0.293 -- 2.00 -- -- -- 10,536 0.242 13,785 0.316 -- 2.10 -- -- -- 10,733 0.246 14,849 0.341 -- 2.20 -- -- -- 10,930 0.251 15,932 0.366 -- 2.30 -- -- -- 11,129 0.255 17,035 0.391 -- 2.40 -- -- -- 11,328 0.260 18,157 0.417 -- 2.50 -- -- -- 11,529 0.265 19,300 0.443 -- 2.60 -- -- -- 11,731 0.269 20,463 0.470 -- 2.70 -- -- -- 11,933 0.274 21,647 0.497 -- 2.80 -- -- -- 12,137 0.279 22,850 0.525 -- 2.90 -- -- -- 12,342 0.283 24,074 0.553 -- 3.00 -- -- -- 12,547 0.288 25,318 0.581 -- 3.10 -- -- -- 12,754 0.293 26,584 0.610 -- 3.20 -- -- -- 12,962 0.298 27,869 0.640 -- 3.30 -- -- -- 13,170 0.302 29,176 0.670 -- 3.40 -- -- -- 13,380 0.307 30,503 0.700 -- 3.50 -- -- -- 13,590 0.312 31,852 0.731 -- 3.60 -- -- -- 13,802 0.317 33,222 0.763 -- 3.70 -- -- -- 14,014 0.322 34,612 0.795 -- 3.80 -- -- -- 14,228 0.327 36,024 0.827 -- 3.90 -- -- -- 14,442 0.332 37,458 0.860 -- 4.00 -- -- -- 14,657 0.336 38,913 0.893 -- 4.10 -- -- -- 14,873 0.341 40,389 0.927 -- 4.20 -- -- -- 15,090 0.346 41,888 0.962 -- 4.30 -- -- -- 15,308 0.351 43,408 0.997 -- 4.40 -- -- -- 15,527 0.356 44,949 1.032 -- 4.50 -- -- -- 15,707 0.361 46,511 1.068 MHFD-Detention_v4-06 - South111524.xlsm, Basin 11/15/2024, 11:21 AM DETENTION BASIN STAGE -STORAGE TABLE BUILDER MHFD-Detention, Version 4.06 (July 2022) 20 15 10 16000 12000 .... 4 a 8000 ..�: ttl 2 L a 4000 0 s 44 a . t 5 }� to a) J 0 - 0.00 1.50 Length (ft) 3.00 Stage Width (ft) (ft) Area (sq.ft.) c f 4.50 6.00 0.380 0.285 0.190 0.095 0.000 1.080 —. 6 fa . 0.810 j Y�fl -- 0.540 �1 H 61 L V m L 2 Q v E 7 0.270 - 0.000 0.00 1.50 3.00 Stage (acres) (ft.) Volume (ac -ft) 4.50 6.00 Area MHFD-Detention v4-06 - South111524.xlsm, Basin 11/15/2024, 11:21 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) Project: I rvine Storage Basin I D: South Pond 1OO-YR VOLUME EURV wac4� (-ZONE 3 /ZONE 2 d ZONE 1 PERMANENT POOL ZONE 1 AND 2/ ORIFICES 100 -YEAR ORIFICE Example Zone Configuration (Retention Pond) Zone 1 (WQCV) Zone 2 (100 -year) Zone 3 User Input: Orifice at Underdrain Outlet (typically used to drain WQCV in a Filtration BMP) Underdrain Orifice Invert Depth = Underdrain Orifice Diameter = N/A N/A Estimated Stage (ft) Estimated Volume (ac -ft) Outlet Type 0.71 0.041 Orifice Plate 1.60 0.181 Weir&Pipe (Restrict) Total (all zones) 0.222 ft (distance below the filtration media surface) inches Underdrain Orifice Area = Underdrain Orifice Centroid = Calculated Parameters for Underdrain ft2 feet N/A N/A User Input: Orifice Plate with one or more orifices or Elliptical Slot Weir (typically used to drain WQCV and/or EURV in a sedimentation BMP) Centroid of Lowest Orifice = Depth at top of Zone using Orifice Plate = Orifice Plate: Orifice Vertical Spacing = Orifice Plate: Orifice Area per Row = 0.00 2.25 N/A N/A ft (relative to basin bottom at Stage = 0 ft) ft (relative to basin bottom at Stage = 0 ft) inches sq. inches User Input: Stage and Total Area of Each Orifice Row (numbered from lowest to highest) Stage of Orifice Centroid (ft) Orifice Area (sq. inches) Stage of Orifice Centroid (ft) Orifice Area (sq. inches) WQ Orifice Area per Row = Elliptical Half -Width = Elliptical Slot Centroid = Elliptical Slot Area = Calculated Parameters for Plate ft2 feet feet ft2 N/A N/A N/A N/A Row 1 (required) Row 2 (optional) Row 3 (optional) Row 4 (optional) Row 5 (optional) Row 6 (optional) Row 7 (optional) Row 8 (optional) 0.00 0.30 0.60 0.90 1.20 1.50 1.80 0.31 0.31 0.60 0.60 0.60 0.60 0.60 Row 9 (optional) Row 10 (optional) Row 11 (optional) Row 12 (optional) Row 13 (optional) Row 14 (optional) Row 15 (optional) Row 16 (optional) User Input: Vertical Orifice (Circular or Rectangular) Invert of Vertical Orifice = Depth at top of Zone using Vertical Orifice = Vertical Orifice Diameter = Not Selected Not Selected N/A N/A N/A N/A N/A N/A ft (relative to basin bottom at Stage = 0 ft) ft (relative to basin bottom at Stage = 0 ft) inches Vertical Orifice Area = Vertical Orifice Centroid = Calculated Parameters for Vertical Orifice Not Selected Not Selected N/A N/A N/A N/A ft2 feet User Input: Overflow Weir (Dropbox with Flat or Sloped Grate and Outlet Pipe OR Rectangular/Trapezoidal Weir and No Outlet Pipe) Overflow Weir Front Edge Height, Ho = Overflow Weir Front Edge Length = Overflow Weir Grate Slope = Hartz. Length of Weir Sides = Overflow Grate Type = Debris Clogging % _ Zone 2 Weir Not Selected 2.25 N/A 4.00 N/A 0.00 N/A 4.00 N/A N/A Type C Grate 50% N/A ft (relative to basin bottom at Stage = 0 ft) Height of Grate Upper Edge, Ht = feet H:V feet Ok User Input: Outlet Pipe w/ Flow Restriction Plate (Circular Orifice, Restnctor Plate, or Rectangular Orifice) Depth to Invert of Outlet Pipe = Outlet Pipe Diameter = Restrictor Plate Height Above Pipe Invert = Zone 2 Restnctor Not Selected 0.00 N/A 12.00 N/A 3.00 User Input: Emergency Spillway (Rectangular or Trapezoidal) Spillway Invert Stage= Spillway Crest Length = Spillway End Slopes = Freeboard above Max Water Surface = 2.80 6.00 4.00 1.00 Overflow Weir Slope Length = Grate Open Area / 100-yr Orifice Area = Overflow Grate Open Area w/o Debris = Overflow Grate Open Area w/ Debris = ft (distance below basin bottom at Stage = 0 ft) inches inches ft (relative to basin bottom at Stage = 0 ft) feet H:V feet Calculated Parameters for Overflow Weir Zone 2 Weir Not Selected 2.25 N/A 4.00 N/A 72.53 N/A 11.14 N/A 5.57 N/A feet feet ft2 ft2 Calculated Parameters for Outlet Pipe w/ Flow Restriction Plate Outlet Orifice Area = Outlet Orifice Centroid = Half -Central Angle of Restnctor Plate on Pipe = Spillway Design Flow Depth= Stage at Top of Freeboard = Basin Area at Top of Freeboard = Basin Volume at Top of Freeboard = 0.48 4.28 0.35 0.99 Zone 2 Restrictor Not Selected 0.15 N/A 0.15 N/A 1.05 N/A Calculated Parameters for Spillway feet feet acres acre -ft ft2 feet radians Routed Hydrograph Results Design Storm Return Period = One -Hour Rainfall Depth (in) _ CUHP Runoff Volume (acre -ft) _ Inflow Hydrograph Volume (acre -ft) _ CUHP Predevelopment Peak Q (cfs) _ OPTIONAL Override Predevelopment Peak Q (cfs) _ Predevelopment Unit Peak Flow, q (cfs/acre) _ Peak Inflow Q (cfs) _ Peak Outflow Q (cfs) _ Ratio Peak Outflow to Predevelopment Q = Structure Controlling Flow = Max Velocity through Grate 1 (fps) _ Max Velocity through Grate 2 (fps) _ Time to Drain 97% of Inflow Volume (hours) _ Time to Drain 99% of Inflow Volume (hours) _ Maximum Ponding Depth (ft) _ Area at Maximum Ponding Depth (acres) _ Maximum Volume Stored (acre -ft) _ The user can override the default CUHP hydro graphs and runoff volumes by entering new values in the Inflow Hydrograghs table (Columns W through AF). WQCV EURV 2 Year 5 Year 10 Year 25 Year 50 Year 100 Year 500 Year N/A N/A 0.87 1.15 1.43 1.87 2.27 2.71 3.92 0.041 0.099 0.051 0.076 0.120 0.239 0.337 0.466 0.784 N/A N/A 0.051 0.076 0.120 0.239 0.337 0.466 0.784 N/A N/A 0.0 0.1 0.6 2.5 3.8 5.5 9.5 N/A N/A 0.4 1.1 4.6 N/A N/A 0.01 0.11 0.33 0.78 1.19 1.42 2.95 N/A N/A 0.7 1.1 1.9 4.0 5.6 7.6 12.5 0.0 0.0 0.0 0.0 0.0 0.1 0.1 1.1 3.7 N/A N/A N/A 0.1 0.0 0.0 0.0 0.2 0.4 Plate Plate Plate Plate Plate Plate Plate Outlet Plate 1 Spillway N/A N/A N/A N/A N/A N/A N/A 0.1 0.1 N/A N/A N/A N/A N/A N/A N/A N/A N/A 39 60 44 54 66 84 92 94 86 42 65 47 58 71 92 101 105 102 0.71 1.02 0.74 0.87 1.08 1.62 2.02 2.38 3.05 0.17 0.20 0.17 0.19 0.20 0.22 0.24 0.26 0.29 0.042 0.101 0.045 0.069 0.113 0.226 0.319 0.409 0.593 MHFD-Detention v4-06 - South111524.xIsm, Outlet Structure 11/15/2024, 11:21 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) 14 500YR IN 500YR OUT 100YR IN 12 ---- 100YR OUT - 50YR IN - - - - - 50YR OUT 10io 25YR IN — 0 0 0 - 25YR OUT 10YR IN - on - 10YR OUT $ ^ — 5YR IN c •V' 15YR OUT —in 2YR IN LL 6 -- -- 2YR OUT EURVIN 0 0 0 - EURV OUT — WQCV IN 4 . WQCV OUT • `` • • • • • • ••• •2 S•• • • f. '• • • . � / • - . .. - -^-- iri r nr: • • . • • •• '. 0 Win.-+.. non..�__ _ e.•� ..� _a-, 0.1 TIME [hr] 1 10 3.5 500YR E 100YR it 50YR 3 = 25YR 10YR 5YR 2.5 - = 2YR I EURV WQCV w 2 H a W o w Z 1.5 0 0. \ J 1 0.5 0 0.1 1 DRAIN TIME [hr] 10 100 50,000 60 45,000 User Interpolated Area [ft^2] Area [ft^2] 40,000 Summary Area [ft^2] 50 35,000 Volume -- O' -e Summary [ft^3] Volume [ft^3] Outflow ••Oas, Summary [cfs] Outflow [cfs] 40 m 30,000 fr u u u 25,000 30 p D J J Q ' 20,000 LL N G ft u 15,000 LU a 10,000 - yif',j,'� 10 - r 5,000 0 0 0.00 1.00 2.00 PONDING 3.00 4.00 5.00 6.00 DEPTH [ft] S -A -V -D Chart Axis Override minimum bound maximum bound X-axis Left Y -Axis Right Y -Axis MHFD-Detention v4-06 - South111524.xlsm, Outlet Structure 11/15/2024, 11:21 AM DETENTION BASIN OUTLET STRUCTURE DESIGN Time Interval 5.00 min Outflow Hydrograph Workbook Filename: Inflow Hydrographs The user can override the calculated inflow hydrographs from this workbook with inflow hydrographs developed in a separate program. SOURCE CUHP CUHP CUHP CUHP CUHP CUHP CUHP CUHP CUHP TIME WQCV [cfs] EURV [cfs] 2 Year [cfs] 5 Year [cfs] 10 Year [cfs] 25 Year [cfs] 50 Year [cfs] 100 Year [cfs] 500 Year [cfs] 0:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.08 0:15:00 0.00 0.00 0.03 0.08 0.13 0.11 0.16 0.17 0.31 0:20:00 0.00 0.00 0.19 0.29 0.38 0.29 0.37 0.47 0.99 0:25:00 0.00 0.00 0.54 0.90 1.31 0.86 1.22 1.59 3.88 0:30:00 0.00 0.00 0.74 1.13 1.93 3.14 4.64 6.04 10.37 0:35:00 0.00 0.00 0.71 1.06 1.80 3.95 5.59 7.58 12.46 0:40:00 0.00 0.00 0.65 0.95 1.57 3.96 5.51 7.41 12.05 0:45:00 0.00 0.00 0.56 0.84 1.38 3.55 4.94 6.85 11.13 0:50:00 0.00 0.00 0.49 0.75 1.20 3.24 4.51 6.23 10.12 0:55:00 0.00 0.00 0.43 0.66 1.04 2.75 3.86 5.50 8.95 1:00:00 0.00 0.00 0.38 0.57 0.90 2.30 3.27 4.83 7.89 1:05:00 0.00 0.00 0.34 0.51 0.80 1.93 2.78 4.30 7.10 1:10:00 0.00 0.00 0.30 0.47 0.75 1.64 2.36 3.57 5.98 1:15:00 0.00 0.00 0.27 0.42 0.69 1.41 2.01 2.97 5.04 1:20:00 0.00 0.00 0.24 0.37 0.61 1.18 1.68 2.40 4.06 1:25:00 0.00 0.00 0.21 0.32 0.51 0.97 1.37 1.91 3.20 1:30:00 0.00 0.00 0.19 0.27 0.42 0.77 1.07 1.46 2.43 1:35:00 0.00 0.00 0.16 0.23 0.33 0.58 0.80 1.06 1.77 1:40:00 0.00 0.00 0.14 0.19 0.28 0.41 0.57 0.75 1.30 1:45:00 0.00 0.00 0.13 0.17 0.24 0.32 0.44 0.57 1.02 1:50:00 0.00 0.00 0.12 0.15 0.22 0.26 0.36 0.46 0.83 1:55:00 0.00 0.00 0.11 0.14 0.21 0.23 0.32 0.38 0.70 2:00:00 0.00 0.00 0.10 0.13 0.19 0.20 0.28 0.32 0.60 2:05:00 0.00 0.00 0.08 0.10 0.15 0.16 0.21 0.23 0.44 2:10:00 0.00 0.00 0.06 0.08 0.11 0.12 0.16 0.16 0.31 2:15:00 0.00 0.00 0.05 0.06 0.09 0.09 0.12 0.12 0.22 2:20:00 0.00 0.00 0.04 0.05 0.06 0.07 0.09 0.09 0.17 2:25:00 0.00 0.00 0.03 0.04 0.05 0.05 0.07 0.07 0.12 2:30:00 0.00 0.00 0.02 0.03 0.04 0.04 0.05 0.05 0.09 2:35:00 0.00 0.00 0.02 0.02 0.03 0.03 0.04 0.04 0.07 2:40:00 0.00 0.00 0.01 0.01 0.02 0.02 0.03 0.03 0.05 2:45:00 0.00 0.00 0.01 0.01 0.01 0.01 0.02 0.02 0.03 2:50:00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.02 2:55:00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.01 0.01 3:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 3:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:05:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:10:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:15:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:20:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:25:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:30:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:35:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:40:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:45:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:50:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5:55:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 6:00:00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 MHFD-Detention v4-06 - South111524.xlsm, Outlet Structure 11/15/2024, 11:21 AM DETENTION BASIN OUTLET STRUCTURE DESIGN MHFD-Detention, Version 4.06 (July 2022) Summary Stage -Area -Volume -Discharge Relationships The user can create a summary S -A -V -D by entering the desired stage increments and the remainder of the table will populate automatically. The user should graphically compare the summary S -A -V -D table to the full S -A -V -D table in the chart to confirm it captures all key transition points. Stage - Storage Description Stage [ft] Area [ft z] Area [acres] Volume [ft 3] Volume [ac -ft] Total Outflow [cfs] For best results, include slope ISV and table inverts and on orifice, spillway, the Floor) of all stages of all grade changes (e.g. from the S -A -V Sheet Basin'. Also Include the outlets (e.g. vertical overflow grate, where applicable). MHFD-Detention v4-06 - South111524.xlsm, Outlet Structure 11/15/2024, 11:21 AM TETRA TECH WELD COUNTY USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 21. DUST ABATEMENT PLAN REVISED 1-22-25 1. A filled water truck will be available on -site during operation, as necessary, for prompt dust control. The water truck will make up to four (4) round trips per day to obtain water from off -site. Vendors or contractors will procure the off -site water from nearby sources. Potential water sources will be locations similar to Wagistics or our water source on Wells Ranch. 2. The access road will consist of gravel road base. Speeds will be restricted to reduce the amount of dust generated. If required by the County, cattle guards and other tracking controls will be installed to prevent gravel from being carried onto public roadways. 3. Waste materials shall be handled, stored, and disposed of in a manner that controls fugitive dust, fugitive particulate emissions, blowing debris, and other nuisance conditions. 4. Site activity can be monitored and paused during times of high winds to help control dust on the site. 5. All development standards will be adhered to. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 I tetratech.com F E w O Q cc Q 2 C� 0 O Q J z D 0 O CC z O U cIt- 0_ z 0 w J LI- Q t� w J LL U W O W z O W C� t'7 O 0 r r i T r z 11/21/2024 B A L 1 1 Np,.. • ter l SZ JJ`—,- ) 1)N \ ,� r �. J.\ 0 n-4 X SI 7� cA SOUTH DETENTION J POND J. OUTLET PIPE) 43.00 LF 12" SDR 35 \0 RIPRAP TYPE L, nd 6'(2', 18" DEEP a f).?. r ti • its ry .� f v \ eN 1 ci Q c f� rr �o �.1 (i\ \( kif x f N • e" L.)6 ressa-saz-sc=n-----a 4829 4830 4.831 4832 4833 en SOUTH DETENTION POND 4822 -a Thc. `err 1 1".# L C\. (); Li \ X5( anXrmAl 483'1 • 4823 Ts x,. 7-5 STA 1+55.23 0�r OFF 0.00' / ) SPILLWAY \ -\ �, ° 1-11 RIPRAP TYPE M, 24" DEEP v �``' / 6' CREST WIDTH, 30' r c, 4 I TOTAL LENGTH. 0 /• eft\ e o_e %-\f j \7 p 1 DCP OPERATING COMPANY, LP 105' PERMANENT PIPELINE EASEMENT REC. NO 4467793 . (7) \ I �f r N\ C.JC1 erTh�5 /"` O "c; - t• 1J aY 1 � � 1� p ,a— o Noses NIP 4824 \' y\ • \'‘..:111v/ 1 0 N i i i � 1 0� 1. �• �,.. -^ • ass ' rearamarararxx 4832 4833 4829 9 Q � , NOBLE SUA - 4078008 APPROX. LOCATION sat r� ! / +IV of ?s )>7-, v ))\,4%, \„).`� \ ✓�� \ ` r & 4+00 l Tz r �3 Lc. I‘la • ,J\ } G� (',@S r L- 3 •sz v r4% • J w ? IRVINE 2-13 O a� a ( lereard. 4831 • • 4832 4 O v ifs C�� a• te. \ eil ..\ < cif i ( 5- (1. St -- Pi ? e•"NIC,,,\ L r ` '7.o+ Lie ^- > \-) Ulla/ ....1, I\ ( 4 t`j j} ) L,I kr) T� .-. � > f PROPOSED di STORAGE a �-- \ FACILITY ,M 5+00 -7 7 6+00 em --0'\i�- ° 7+pp IV I N% f - l' 1‘) Thrkrit I C -CFN 811 i ) ti ``� . `'`moo N 1 N. / -✓ \ ....s...", • -� r a r r f � A \- 1 -.J � 4 V 1r J J •{ 4826 - c a'J 1 f, �X XX. s 0 OP c � . ki; t-0 ") 1 1`-); \,) O 13 • CP ..xpre•�X~ �rret Lr 1 1 C CD 1... 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CREST WIDTH, 33' r- TOTAL LENGTH. • 4 LOTIA-TRE-1-7141 REC NO. 2169382 (NOT A PART) • • Hid BILE OFFICE TRAILER • • • • DCP MIDSTREAM, LP 30' PIPELINE EASEMENT REC. NO 4102449 NORTH DETENTION POND iv 'OUTLET PIPE 43.20 LF 12" SDR 35 RIPRAP TYPE L, 6'x2y, 18" DEEP tab if\ XX IRVINE INC. CO. 30' PIPELINE EASEMENT REC. NO. 4279505 40 CHAIN LINK FENCE PROPERTY LINE PARCEL BOUNDARY SECTION LINE EXISTING UTILITY EASEMENT EXISTING CONTOUR EXISTING CONTOUR PROPOSED ACCESS ROAD ACTIVE GAS WELL LOCATION ABANDON GAS WELL LOCATION DRAINAGE FLOW co 117-7116003 Copyright: Tetra Tech Bar Measures 1 inch, otherwise drawing not to scale LESIGRAD w C!) 0 Q U W L.L U W O o_ z O W 2 U 0 co r r i r U z 2 U W Q cc W C/) U O U U U Q w U C� w U W 11/2112024 C v } r �`� r t _.:-- \.. a 6 If) is# CIF\ • () f r .x.) 9 C c• • 0 C.J -.....e`) t \ ----- \, —.... /It -4 --I ° \_. - 4 \ 0 0 ‘1 * /Cf�� t IL 0 % )); 4 ) M /V\ I go/ alS;')er.-x\Thab. , %,,.-\ Li r) A i 1 .re ,.., oej 1 2, 1 xr......................rrossoas "'RR' `-rte X'�'� r-. ?�- c \-,.�- r -1?......L : i N, --%N. --\\\ „ca.* "—lean —7R-------::::—. 9%ir- ......... \ e/ .\••••,/ n en.iletiel*r if I 1 *.f:') 0 ?Vert,' if- 2 5 r i---tm , 4---a------- .....\,...x re---isp.,,„x----------Tx et:grir. 6 ( I �4�27 �, (,.- J • --f ' ) --� 11 Le... ) \ ? � � i jle\ `' )• (-J. 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NO 4102449 NORTH DETENTION POND /OUTLET PIPE 43.20 LF 12" SDR 35 SPILLWAY RIPRAP TYPE M, 24" DEEP 11' CREST WIDTH, 33' TOTAL LENGTH. RIPRAP TYPE L, IRVINE INC. CO. 30' PIPELINE EASEMENT REC. NO. 4279505 • 1. VEHICLE TRACKING CONTROL SHALL BE INSTALLED BETWEEN THE SITE AND THE CURRENT DCP ACCESS ROAD XX FENCE LINE S EDIMENT CONTROL LOG PROPERTY LINE PARCEL BOUNDARY S ECTION LINE EXISTING UTILITY EASEMENT EXISTING CONTOUR EXISTING CONTOUR S ROPOSED ACCESS ROAD ACTIVE GAS WELL LOCATION ABANDON GAS WELL LOCATION DRAINAGE FLOW S EEDING OR HYDROMULCH S URFACE ROUGHENING co o Lli Lli fY ›- ›- Z < < O CL Ir-t 0 Ct Lli I- 2 Cf) rt r: Z HO fY ›- 0 E 0 0 D 2 z c.,Zz > Z O ° Z 0 1 i- 0) 0 0_ 0 Lt >LL1 Bar Measures 1 inch, otherwise drawing not to scale 1 2 3 4 5 6 7 F E D w U Q o° 0 o! Q 0 uj w i- 0 z r 0 U w o_ 2 m C U) Ili I - w 11.1 U) Q U 65 Ili J_ L.L 1- O Li a° D_ 2-- 0 o! w s U co O c0 r r i i- B r r r U z :52:19 PM - C:(USERSIGRACE.HARTOCIACCD0CSITETRA TECH r 11/21/2024 A GENERAL NOTES: CONTRACTOR SHALL NOT DEVIATE FROM ANY INFORMATION CONTAINED IN THIS GRADING PLAN WITHOUT FIRST OBTAINING WRITTEN APPROVAL FROM THE OWNER AND ENGINEER. CONTRACTOR SHALL SUBMIT AS BUILT DRAWINGS TO THE CLIENT AT THE COMPLETION OF THE PROJECT. THESE MAPS DO NOT REPRESENT A MONUMENTED LAND SURVEY AND SHOULD NOT BE RELIED UPON TO DETERMINE ANY PROPERTY INTERESTS. DATA HAVE NOT BEEN FIELD VERIFIED AND ANY PUBLICLY AVAILABLE DATA HAVE NOT BEEN INDEPENDENTLY VERIFIED. A GEOTECHNICAL REPORT WAS NOT PROVIDED FOR THIS SITE. SAFETY: THE CONTRACTOR SHALL ADHERE TO ALL APPLICABLE HEALTH AND SAFETY STANDARDS INCLUDING, BUT NOT LIMITED TO, OSHA 29 CFE PARTS 1910 AND 1926. THE CONTRACTOR SHALL ALSO BE RESPONSIBLE FOR JOB SITE SAFETY, INCLUDING THAT OF THE GENERAL PUBLIC AND VISITORS. CONTRACTOR SHALL BE RESPONSIBLE ALL DUST CONTROL DURING CONSTRUCTION. CONTRACTOR SHALL BE RESPONSIBLE FOR PERFORMING ALL UTILITY LOCATES. CLEARING AND GRUBBING: CONTRACTOR SHALL CLEAR AND GRUB THE PROJECT AREA PRIOR TO CONSTRUCTION, AND THE CONTRACTOR SHALL BE RESPONSIBLE FOR DISPOSAL OF ALL WASTE MATERIALS CREATED DURING THIS PROCESS. CONTRACTOR IS RESPONSIBLE FOR FOLLOWING ALL STATE AND FEDERAL REQUIREMENTS RELATED TO THE CLEARING AND GRUBBING PROCESS. GRADING, COMPACTION AND EARTHWORK: CONTRACTOR IS RESPONSIBLE FOR DISPOSAL OF ALL EXCESS MATERIAL ACCORDING TO ANY APPLICABLE STATE AND FEDERAL STANDARDS. ANY STOCKPILED MATERIAL SHALL HAVE APPROPRIATE EROSION CONTROL MEASURES PROVIDED BY THE CONTRACTOR. COMPACTION SHALL BE VERIFIED USING ASTM D-6938 OR AN EQUIVALENT METHOD APPROVED BY THE ENGINEER AT A MINIMUM RATE OF: • HIGH VEHICLE TRAFFIC AREAS: 1 TEST PER 6" LIFT PER 12 FEET OF WIDTH PER 500 FEET OF LENGTH OR EQUIVALENT • DETENTION PONDS: 1 TEST PER 6" LIFT PER 2,500 SQUARE FEET OR EQUIVALENT • STRUCTURAL FOUNDATION AREAS: 1 TEST PER 6" LIFT PER 1,000 SQUARE FEET OR EQUIVALENT • ALL OTHER AREAS: 1 TEST PER 6" LIFT PER 40,000 SQUARE FEET OR EQUIVALENT CONTRACTOR SHALL KEEP RECORDS OF COMPACTION AND SHALL PROVIDE THESE RECORDS PRIOR TO INDEPENDENT CONFIRMATION BY A QUALIFIED INSPECTOR. ALL MATERIAL SHALL BE PLACED IN 6" HORIZONAL LIFTS UNLESS NOTED OTHERWISE. S UBGRADE SHALL BE SCARIFIED TO A MINIMUM OF 6" AND COMPACTED TO 95% OF THE MAXIMUM ACHIEVABLE DENSITY UNLESS OTHERWISE NOTED. ALL NON -GRAVEL MATERIAL SHALL BE COMPACTED IN 6" LIFTS TO A MINIMUM OF 95% OF THE MAXIMUM ACHIEVABLE DENSITY AT +/-2°/0 OPTIMUM MOISTURE CONTENT IN ACCORDANCE WITH ASTM D-698 UNLESS OTHERWISE NOTED. ALL GRAVEL MATERIAL SHALL BE COMPACTED IN 6" LIFTS TO A MINIMUM OF 90% OF THE MAXIMUM ACHIEVABLE DENSITY AT +/-2% OPTIMUM MOISTURE CONTENT IN ACCORDANCE WITH ASTM D-1557 UNLESS OTHERWISE NOTED. ROAD BASE SHALL CONFORM TO CDOT CLASS 5 AGGREGATE BASE COURSE AND BE COMPACTED IN 6" LIFTS TO A MINIMUM OF 95% OF THE MAXIMUM ACHIEVABLE DENSITY AT +/-2% OPTIMUM MOISTURE CONTENT IN ACCORDANCE WITH ASTM D-698 UNLESS OTHERWISE NOTED ALL QUANTITIES PRESENTED IN THESE DRAWINGS ARE ESTIMATES ONLY, AND THE CONTRACTOR IS RESPONSIBLE FOR DETERMINING ALL FINAL QUANTITIES. CONTRACTOR SHALL VERIFY ALL DIMENSIONS PRIOR TO CONSTRUCTION. CONTRACTOR SHALL BE RESPONSIBLE FOR ANY DAMAGES TO EXISTING SITE FEATURES. EARTHWORK TOLERANCES ARE +/- 0.10 FEET UNLESS NOTED OTHERWISE. CONTRACTOR IS RESPONSIBLE FOR ALL STORMWATER AND SEDIMENT CONTROL BEST MANAGEMENT PRACTICES (BMPS). THESE CONTROLS SHALL BE IMPLEMENTED IN ACCORDANCE WITH ALL APPLICABLE STATE AND FEDERAL REQUIREMENTS INCLUDING, BUT N OT LIMITED TO, THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM REQUIREMENTS. ALL PERIMETER BMPS SHALL BE INSTALLED PRIOR TO ANY EARTHWORK, AND LOCATION SPECIFIC BMPS SHALL BE INSTALLED PRIOR TO WORK AT THAT LOCATION. IMPORTED FILL MUST MEET ASTM-1231 SPECIFICATION FOR TYPE I, GRADE B MATERIAL UNLESS OTHERWISE NOTED. • 100% FINER THAN 2" SIEVE • 75%-95% FINER THAN 1" SIEVE • 40%-75% FINER THAN #3/8 SIEVE • 30°/o-60% FINER THAN #4 SIEVE • 20°/o -45°/o FINER THAN #10 SIEVE • 15%-30% FINER THAN #40 SIEVE • 5°/o-15% FINER THAN #200 SIEVE • MAXIMUM EXPANSIVE POTENTIAL 0.5°/o • MAXIMUM LIQUID LIMIT 25 • MAXIMUM PLASTICITY INDEX 6 CONTRACTOR SHALL AVOID PLACING HEAVY LOADS WITHIN 30 FEET OF THE EDGE OF THE CONSTRUCTED PAD. FINAL GRADE MUST MAINTAIN POSITIVE DRAINAGE ACROSS THE SITE, AND ANY SETTLEMENT OR DAMAGE MUST BE REPAIRED PRIOR TO ACCEPTANCE. CONTRACTOR SHALL FIELD VERIFY LOCAL MONUMENTS BEFORE BEGINNING CONSTRUCTION. CULVERTS SHALL BE INSTALLED ACCORDING TO MANUFACTURER SPECIFICATIONS. VEGETATION SHALL HAVE THE FOLLOWING MIX: • SIDEOATS GRAMA (25%) • WESTERN WHEATGRASS (20%) • SAND BLUESTEM (15%) • REEDGRASS (15%) • NEEDLE AND THREAD (15%) • SWITCHGRASS (10%) N RCS SOIL CLASSIFICATION IS OTERO SANDY LOAM AND NELSON FINE SANDY LOAM EROSION AND SEDIMENT CONTROL: THE OPERATOR SHALL HOLD A VALID STORMWATER CONSTRUCTION PERMIT AND STORMWATER MANAGEMENT PLAN CONSISTENT WITH CDPHE REQUIREMENTS. ALL CONSTRUCTION ACTIVITIES INCLUDING BMP USE, INSPECTIONS, AND ONLINE REPORTING SHALL BE CONDUCTING ACCORDING TO THE STORMWATER MANAGEMENT PLAN. INSPECTIONS SHALL OCCUR EACH WORKDAY, AND AS SOON AS POSSIBLE FOLLOWING A STORM EVENT. THE DISTURBANCE BOUNDARY SHALL BE CLEARLY MARKED AND FENCED PRIOR TO CONSTRUCTION IN ORDER TO KEEP CONSTRUCTION VEHICLES FROM ENTERING AREAS OUTSIDE THE DISTURBANCE BOUNDARY. CONTRACTOR SHALL BE RESPONSIBLE FOR REPAIRING, REPLACING, AND IMPLEMENTING ADDITIONAL STORMWATER AND SEDIMENT CONTROL BMPS AS REQUIRED. S EDIMENT OR OTHER MATERIAL TRACKED ONTO PUBLIC ROADS SHALL NOT BE DEPOSITED IN ANY ROADSIDE DITCH, WATER FEATURE OR STORM SEWER, AND SHALL BE RETURNED TO THE SITE AT THE END OF EACH DAY. TOPSOIL REQUIREMENTS: • TOPSOILED AREAS ARE TO BE SCARIFIED TO AT LEAST 5" FOR ALL SOILS, AND 12" FOR COMPACTED SOILS PRIOR TO PLACEMENT. • VEGETATED AREAS SHALL HAVE AT LEAST 4" OF TOPSOIL IN PLACE BEFORE VEGETATION OCCURS. • FILL OUT SLOPES SHALL HAVE A LEAST 2" OF TOPSOIL. AN INSPECTION BY THE LOCAL CONSERVATION DISTRICT SHALL BE COMPLETED PRIOR TO REMOVAL OF EROSION AND SEDIMENT CONTROL BMPS. EROSION AND SEDIMENT CONTROL BMPS MUST BE REMOVED AT THE END OF CONSTRUCTION AFTER THE INSPECTION HAS OCCURRED. CONTRACTOR SHALL NOT ILLEGALLY DISPOSE OF ANY CONSTRUCTION MATERIALS AND MUST ADHERE TO ALL STATE AND FEDERAL GUIDANCE REGARDING DISPOSAL. ALL RIPRAP SHALL BE PLACED TO A DEPTH OF 2 TIMES THE D50 STONE SIZE. MIRAFI FW-300 OR AN EQUIVALENT APPROVED BY THE ENGINEER SHALL BE INSTALLED UNDER ALL RIPRAP. RIPRAP SHALL BE INSPECTED FOR DAMAGE FOLLOWING ALL HEAVY RUNOFF EVENTS. ALL RIPRAP SHALL BE MIXED 35% TOPSOIL BY VOLUME, BURIED WITH 6 INCHES OF TOPSOIL AND RE -VEGETATED. S EDIMENT CONTROL LOGS SHALL BE FREE OF NOXIOUS WEEDS AND SHALL CONTAIN STRAW, COCONUT FIBER, OR COMPOST. LOGS S HOULD BE FREE OF ANY DEFECTS OR DAMAGE PRIOR TO AND DURING USE. S EDIMENT CONTROL LOGS SHALL BE TRENCHED INTO THE GROUND TO 1/3 OF THE LOG DIAMETER, AND THE UPHILL SIDE SHALL BE BACKFILLED WITH SOIL. ALL MANUFACTURERS SPECIFICATIONS FOR STAKING SHALL BE FOLLOWED. STAKING SPACING SHALL BE 4' ON CENTER (10' FOR COMPOST LOGS) TO A DEPTH OF 6" INTO THE GROUND, WHERE 3" OF THE STAKE SHALL PROTRUDE FROM THE TOP OF THE LOG. LOGS SHALL BE PLACED WITH A MINIMUM OF 12" OF OVERLAP AT EACH END. S EDIMENT CONTROL LOGS SHALL BE CHECKED FOR SEDIMENT ACCUMULATION AND THE SEDIMENT SHALL BE REMOVED WHEN THE ACCUMULATION HEIGHT EQUALS HALF OF THE HEIGHT OF THE LOG. ROCK SOCKS SHALL BE USED AS UPSTREAM PROTECTION FOR CULVERTS. THEY SHALL BE PLACED DIRECTLY IN FRONT OF THE CULVERT AND ARE TO BE INSTALLED IMMEDIATELY AFTER CULVERT INSTALLATION IS COMPLETE. AASHTO #3 ROCK SHALL BE USED TO CONTROL SEDIMENT TRACKING OFF SITE BY VEHICLES. THE ROCK LAYER SHALL BE A MINIMUM OF 70 FEET LONG, 20 FEET WIDE, AND 9" THICK UNDERLAID BY MIRAFI FW300 OR AN EQUIVALENT GEOTEXTILE APPROVED BY THE ENGINEER. m Z O H o_ L U wo w Qo L Q 2 z o_ 2 �O UU Z W Q 2I- < ° D _ 1O O� Z� Z ❑ Oz CC Z LE _ i- 0 < o_ O o_ w J U LL O wQ C7 12 QO rt J Z z W D a_U OD W J > W UJ D� W Z PROJ: DESN: AC DRWN: GH CHKD: AC 7 r c.) i- i- 2 id i- je _o_ L a O U Bar Measures 1 inch, otherwise drawing not to scale F E D C7 0 ui w O z C7 U W w m C cn w L.L W W 2 C!) 0 Q U w LL U W O 0_ z O w U 0 r B U Z U Q w co U O 0 U U U Q w U 0 w co A U w 00 N CV 11/2112024 SM-3 Mitt 1. MIN. . 4A MINN Construction Fence (CF) Pine GAR STUDDED „TFIEL, / SEE PT ! STING GRADE (11 ' SPACING MAXseer ,.i ' I� ♦ r- i i I III I i il (�• Mil.. pp". ORANGE RE I N ET CONSTRUCTION FENCE OR APPROVED EQUAL TI ED TEL TEE POST CF.---1PLASTIC MESH CO,NSTRUCTION FENCE - a ''TLIT�CC 1` EPE IITLL��I` HTE_ t SEE PLAN VIEW FOft —LOCATION OF CONSTRUCTION FENCE �.: ►EOil STRUCTaa l FENCE CE SHOWN SHALL DE INSTALLED PRIOR TO ANY LAND DISTURBING AC:WT-1 _ 3. CONSTRUCTION FENCE SHALL BE COMPOSED OF OFVOIGE„ CONTRACTOR —GRADE MATERIAL THAT IS AT LEAST 4s HIGH,. FETAL POSTS SHOULD HAVE A PLASTIC CAP FOR SAFETY. 4., STUDDED r L TEE POSTS SHALL BE UTILIZED TO SUPPORT THE CONSTRUCTION FENCE MAXIMi Iil SPACING FOR STEEL TEE POSTS SHALL HE, 10% 5, CONSTRUCTION FENCE SQL BE SECURELY FASTENED TO THE TOP, MIDDLE, At. L4 BOT1OM OF EACH POST. CF -2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Fence (CF) SM-3 O!ST UC ION_FENCEWES, 1. INSPECT BMPs EACHWORKDAY; AND MAINTAIN THEM IN EFFECTIVE OPERATING campmate MAINTENANCE OF BMPs HOUI) BE P' OACTWEi NOT REACTIVE INSPECT BMP's AS SOON AS POSSIBLE (AND ALWAYS WITHIN 4 HOURS) FOLLOWING A STORM THAT CAUSES SURFACE EROSION. ,AND PERFORM WECESSARY MAINTENANCE FREQUENT OBSERVATIONS AND MAINTENANCE AL, NECESSARY TO I1/4gAI 1TAINI BMPs a EFFECTIVE OPERATING `ONDMON: INSPECTIONS AND CORRECTIVE MEASURES SHOULD BE DOCUMENTED THOROUGHLY. 3 WHERE BIAPs HAVE FAILED. REPAIR OR REPLACEMENT SHOULD BE INITIATED UPON DISCOVERY OF THE FAILURE. o CCN TRUCTION FENCE SHALL BE REPAIRED OR REPLACED ED WHEN THERE ARE SIGNS OF DAMAGE RICH AS RIPS OR SAGS, CONSTRUCTION FENCE IS TO REMAIN IN PLACE LitsifiL THE 'UPSTREAM DI TUR ED AREA IS TABILIZED AND ,APPROVE0 BY THE LOCAL JURISDICTION. 5. WHEN CONSTRUCTION FENCES APE REMOVED, ALL. DISTURBED MEAS ASSOCIAM WITH THE I N TALLATION, MAINTENANCE, AND/OR REMOVAL OF THE FENCE SHALL BE COVEREICI WITH TOPSOIL, SEEDED AND MULCHED, OR OTHERWISE STABILIZED A -S .APPROVED BY LOCAL JURISDICTION. NM MANY JURISDICTION HAVE, B IB DETAILS THAT rYARY FROM r IDECI)STANDARD) DETAILS. CONSULT WITI-I LOCAL JURISDICTION TO WI-IICH DETAIL, SHOULD BE USED WIEN DIFFERENCES ARE N OTED . AIL ADAPTED FROM TOWN € F PARKER, COLORADO. NOT MAILAELE IN T ) November 2010 Urban Drainage and Flood Control District CF -3 Urban Storm. Drainage Criteria Manual Volume 3 m z O 0_ U W 0 W Q 0 Z 0_ QO UU � Z wo 2I- < 0 0 �O o � z� Z 0 o z w Z 0_ 2 I- < O 0_ w H J U �O 0 wQ O � Q O DC J 0 0 Z z W0. � � 0 W J >LiJ W D W Z PROJ: DESN: AC DRWN: GH CHKD: AC 8 ght: Tetra Tech Bar Measures 1 inch, otherwise drawing not to scale w U Q cc 0 0 0 w O z 0 U w o_ I m CD w J_ LL 1- 0 U J LL 1- U O CC 0. z O CC w U 0 r T r U z U w U O U U U 0 <C LLi U O 65 � A r U 0 - co N F E D C 11/21/2024 Sediment Control Log (SCL) SC -2 or -, 47. 1 111,r il,hr x 18' OMNI) WOODEN `STAKE DIAMETER WII ) (eic SEDIMENT niCA TRCiL LUG G, -41t5.. { °a, NOTE vice \F l� �i at r� �'�� .LAE R DIAMETER SEDIMENT CONTROL LOGS MAY NEED T BE EMBEDDED DEEIS'ER, .I3LA E WIG AGAINST SIDEWALK DR BACK F COIFS hilHEN ADJACENT TO THESE FEATURES. TRENCHED SEDIMENT CONTROL LOCI c CENTER TAKE IN CONTROL LOG t COMPACTED E C AVATEC TRENCH DII_ SHED SEDIMEN 12H OVERLAP (MINI 4 Er DIAMETER (MIN) SEDIMENT CONTROL LOG DIA . SCL (T P-.) WOODEN STAKE e" TT 9" DIMMER (MIN) SEDIMENT CONTROL LOG LOG SCL-1. TENCHED SEDIMENT CONTROL LOG November 2015 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 3 SCL-3 SC -2 Sediment Control Log (SCL) SENVEtiT CONTROL LOG I WALLATI ON NOTES EE FLAN VIEW FOR LOCATION AND LENGTH OF SEDIMENT CI TRVL LOGS, 23 SEDIMENT CONTROL LOGS, THAT ACT AS A PEI lETER CONTROL SHALL BE INSTALLED PRIOR TO .ANY LIPGRAD T LAND —DISTURBING ACTIVITIES • SEDI MENT CONTROL LOGS SHALL CONSIST of SST 'R- Okii:P i T, EXCELSIOR OR CONU FIB ERN AND SHALL BE FR EE OF ANY NOXIOUS FEED SEEDS OR DEFECTS I CLU DI 1G. RI P 4 HOLES AND 08‘410US WEAR. 4, SEDIMENT COOL L LOGS MA's^ BE USED AS SMALL CHECK DAMS IN DITC H ES AN1D SWALE'S', H OWEVERR THEY SHOULD NC T BE USED IN PERENNIAL STREAMS, -5, IT IS RECOMMENDED THAT SEDIMENT CONTROL LOGS BE TRENCHED INTO THE GROUND T A, DEFTH OF APPROX I MATED' )5 OF THE DIAMETER OF THE Lea IF TRENCHING TO THIS DEFTH IS NICT FE ' I LE ANWO R DESIRABLE H ORT TERM I NET h ILLATION WITH DE I R E NOT TO DAMAGE LAND -APE A LESSER TRENCHING DEPTH MAC`' BE ACCEPTABLE WITH MORE ROBUST S T,AK I -,,, COMF'CIST LOGS THAT ; ;E B LB 'FT - 0 NOT NEED TO BE TRENIC HEEL fin THE UPHILL SIDE OF THE SED ENT CONTROL LOG SHALL 3E BFI LLE� WITH SOIL OR FILTER MATERIAL THAT IS FREE OF DOCKS AND DEB RI S r THE SOIL SHALL BE TIGHTLY MPACTED INTO THE SHAPE OF A RIGHT TRIANGLE RISING A SHOVEL OR WEIGHTED LAWN -ROLLER OR BLUM IN PLACE, 71 ��r .M FOLLOW ANIUFAC'TUREI H GUIDAN CE FOR STAY I N Sir IF IANUFA TURE I' IN RU TIDN DO NOT SPECIFY SWING, STAKES SHALL RE PLACED ON tat/ CENTERS i' D EMBEDDED A 101IN I MUM OF an I KO THE GROUND., r OF THE STAKE SHALL PROTRUDE FRAM THE TOP OF THE LOG, STAKES THAT AR E EI�I PRIOR TO INSTALLATION SHALL BE REPLACED?, COMPOST LO B. HOLD BE STAKED 1 C1' ON CENTER. SEDIMENT CONTROL LOIN MAINTENANCE ICE NOTES ,1. INSPECT B P s EACH WORKDAY; AND MAI NTAI N THEM IN EFFECTIVE OPERATING D ITIO H H MAINTENANCE OF B Ill% SHOULD BE PROACTIVE, NOT REACTIVE INSPECT C Ids Ps AS SOON A POSSIBLE AN1D ALWAYS WITHIN � 4 HOUR FOLLOWING A STORM THAT CAUSES SURFACE EROSION,. AND PERFORM NECESSARY MAINTE dAME. a FREQUENT OBSERVATION . NII MA1 NTENAN E ARE NEC ESSARY TO MAI NTAI N HINTS IN EFFECTIVE OPER4TNG CONDITION. INSPECTIONS AND CORRECTIVE MEASURES; SHOULD BE DOCUMENTED THOROUGHLY'. 3, WHERE 9M1P1'� HAVE FAILED REPAIR R REPLACEMENT SHOULD HE INITIATED UPON DIECCVERY OF THE FAILURE. -4, A tRA U L TED UPSTREA141 OF SEDIMENT CONTROL LOS' SHALL BE REMOVED A .NEED ED TO killAINTAI N FUNCTIONALITY OF THE EiMP., TYP ICS LLY WHEN DEPTH OF ACCUMULATED FiED I I ENT IS AF'P R I aT ELY �; qF THE HEIGHT Of THE EDI M ENT f TROL LOG; 5. SEDIMENT CONTROL DOG SHALL BE REMOVED AT THE END OF CO N STRU T1O . OM POST FRPOST LOGS MAY BE LEFT IN PLACE AS LONG AS UAGS ARE REMOVED AND THE AREA SEEDED. IF DISTURBED AITE4'451 EXIST AFTER HEI? OVALH THEY SHALL BE COVERED WITH TOP' SOIL, SEEDED AND fw U LCH E IT! S�� R OTHERWISE AS I LI ZED I NI A. MANNER APPROVED] BY THE LOCAL JURISDICTION. OrrA1LMOOTED�ED MOM TOWS OF PrnitEit OLC` Ala JEFFERSON!! . p COV COIX Mat DOLO.AS `��'�T�f rCOLCM004 Mai CITY' OF AZIR `RON Lei +ik150 E, AVAILABILE IN UTOCAD) NOTE:' MANY JURISDICTIONS HAVE EiMP DETAILS THAT WAY FROM UDFCD STANDARD on-Ans. • NI U LT ITH LOCAL J 'I D I TI ONl AS TO WHICH DETAIL SHOULD BE USED WHENI DIFFERENCES ARE N TE , SCL-6 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 COMPOST SERI DLOWNPLACED FILTER MEDIA R SOIL FLOW 'ETI0 Sediment Control Log (SCL) a z �. x 16" (MIDI) WOMEN TAKE tr DIAMETER y�i�IN) �OMPOr� N TES 1,THIt; DETAIL IS FOR USE NTH SEDIMENT CONTROL LLOGSTHAT ARE A MINIMUM OF a win 2. LACE LUG AGAINST SIDEWALK' aR BACK OF mks s THEN iAaliAENT TO THESE FEATURE, ENT CONTROL LOG (WEIGHTED) ENTER 'STAKE Lam, " UTAMETE OM) ) COM:V. CIST �. SERIMEhT CC TROL LOG COMPOST SEDIME T CONTROL LOG T2 .ictioitlE.L7LAP s- 1 4 WOODEN ST. E I. - id J rte. ``. SEDI IEIT , , L LlO d LOG JOINTS SCL-2. COMPOST SEDIMENT CONTROL LOG (WEIGHTED) SCL-4 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 3 November 2015 43 MAX FOR: TREr IFI ED Sas #1 vim FOR COMPOST CLE CONTINUOUS SOL -- AT PERIMETER OF CO NSTP LICTIDhfi SITE m z O o. cc Ucin W 0 W H Q 0 z a_ �t O UU CC w0 2I— < 0 I-0 CL Occ Z °- Z O z C > O Z � W _ 0 Q ce O a_ X w J <U p I -I- O W < O � < O OO HU w z~ z w O0 J D W —I W W 0 S W Z PROJ: DESN: AC DRWN: GH CHKD: AC 9 Copyright: Tetra Tech Bar Measures 1 inch, otherwise drawing not to scale w U Q cc 0 H r. 0 (1j O z O U w w I m cn w J I - W W 2 U) 0 Q U C!) W J LL 1- 0 W O CC W z O CC W U 0 r T r U z U w U O 0 U U U 0 <t w U �L O w A r U 2 w N Lin F E D C 11/21/2024 Vehicle Tracking Control (VTC) SM-4 SiDE AL ! oTHER SAVED SURFACE PuELI oADi'AY INSTALL ROCK FLUSH WITH ti +R BELL' TOP OF PAVEMENT �\ COMPACTED 5UBGFeAD SECT] 0 N 50 FOOT(MIN.) �_ I VT 20 FOOT (WEDTH CAN LESS IF CONST, vEHiCLES ARE PHYSICALLY CONFINED O BOTH SIDES) Om) uriLMS CiTHOWESE SPECiFiED By LOCAL JU ISDI TIiOHt LICE COOT SECTr #7o3c AASHTC #3 o sE AGGREGATE OR MINUS ROCK N = ifvfm GECTEXELE FAERIC BETWEEN at AND ROCK uNLESS OTHERwrSE SPECIFIED BY LOCAL JURISDICTION* USE cDOr SECt #703i AASHICI r 3 COARSE AGGREGATE / 6" i� iNu RODS '2�r 011161) EGATE_VEHICIE TRAG NONI-WOVEN EcirEn:LE FABRIC November 2010 Urban Drainage and Flood Control District Urban Stone Drainage Criteria Manual Volume 3 VTC-3 SM-4 Vehicle Tracking Control (VTC) AB CO M E r E SIT It-SIM. _T_IO rit it SEE PLA ■ viEw FOR _LOCATION OF CON TRLI TION E + E(S EW( =WEE OF COP4STRUC11ON ENTRANCE(SWE TS(S) OVITH/WITHOUT WHEEL INASH, O STRoc'P MAT OR TRIG'),. 2r CONSTRUC1 ON MAT OR TRM STABILIZED ODNSTRUCTION ENTRANCES ARE ONLY To BE USED ON SHORT DURA11ON PROJECTS (TvPiCALLY RAANGiN FROM A WEEK TO A mONTH) HERE THERE *ILL DE umiTED vEHICuLAR ACCESS: 3z A STABILIZED CONSTRUCTION ENTRANCE/EXIT SHALL BE LOCATED AT ALL .ACCESS POINTS HERE VEHICLES ACCESS THE CONSTRUCTION SITE FROM PAVED RI HT-ONAY . Ett, STABILIZED CoNsTRUCTION ENTRANCE/E ,IT SHALL BE INSTALLED PRIOR TO ANY LAND DISTURBING RBIN ACTIVITIES. . A I'` O '=4 OVEN DEOTE TILE FABRIC SHALL BE RACED uNDER THE STABILIZED CONSTRUCTION ENTRANCE/EXIT PRIOR TO THE PLACEMENT OF ROCK., 6. UNLESS OTHERWISE SP ECIF EB BY LOC& JURISDICTIONi ROCK SHALL coNSi ST of cur SECT. #703, AASHTO #3 COARSE AGGREGATE OR 6" (MINUS) ROCIC ST tZED CONS u N INTEIIA'E NO S 1, INSPECT EMPs EACH WORKDAYL, AND MAINTAIN THEM IN EFFECTIVE OPERATING CONDITIOW MAINMNANCE DE BMPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT BMPs AS SOON AS POSSIBLE (AID ALWAYS WITHIN 24 HOURS) FOLLOWING STORM THAT CAUSES SURFACE EROSION, ADD PERFORiavi NECESSARY MAINT AN E, 2; FREQUENT OBSERVATIONS CATION AND IMAINTENAN E- ARE NECESSARY TO mAINTAiN BmPs iN EFFECTIVE OPERATING NDITINA INSPECTIONS AND CORRECTIVE MARES SHOULD BE DOCUMENTED THOROUGHLY., 3r WHERE EIMP's HAVE FAILED. REPAIR OR REPLACEMENT SHOULD BE, INITIATED UPON DI COvE E THE FAILURE. 4; ROCK SHALL DE REAPPLIED DR RE RACE „AS NECESSARY TO THE STAGIUZED ENTRANCE/EXIT M MAINTAIN A CONSISTENT DEPTH., 5_ SEDIMENT TRACKED ONTO PAVED ROADS iS TO BE REMOVED THROUGHOUT THEE' DAY AND AT THE END OF THE. DM' BY SHOVELING OF? SWEEPING. SEDIMENT MAY NOT SE WASHED nOWN STORM SEWER DRAINS; 'T^" MANY JURISDICTIONS HAVE BMP SAILS THAT VARY FROM UDFM STANDARD DETAILS., CONSULT WITH LOS JURISDICTIONS AS TO WHICH DETAIL SHOULD GE USED iiVHEN DIFFERENCES ARE NOTED. toga&win) mom on OF BROomr ti, COLORADO., NOT AvaA8LE IN `) VTC-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 m z O o. cc U W W H Q 0 >- z Q a_ <O UU c �w � G I— < O _o �0 �O Occ z °- z� O z � <t z > O w_ = I - U <[ ce O a_ X w _1 U Q Q I -I- 0 W < O � < O It J OO I— U W z~ wz O� JD W —I > W W 0 W Z PROJ: DESN: AC DRWN: GH CHKD: AC 10 Copyright: Tetra Tech Bar Measures 1 inch, otherwise drawing not to scale 1 2 3 4 5 6 7 F E D w U <C cc 0 0 w O z O 2 U w w I 2 Do C cn w J I — W W 2 U) 0 Q U C!) W J LL 1- 0 W O CC 0- 0 W U 0 r T Gr z U w U O 0 U U U 0 <C w U <t O w A r U 2 w 0 11/21/2024 TRACKING OR IMPRINTING FURROWS TO DEEP WITH e"s MAXIMUM SPACING PARALLEL TO CONTOURS zgj)57 -1. SURFACE ROUGHENING FOR STEEP SLOPES Oti OR -STEEPER) ROUGHENED ROWS SMALL BE 4." TO i" DEEP WITH ea t+AAXIMLIM SPACING PARALLEL TO CONTOURS IRFA,C'E ROUGHENING EC -1 Surface Roughening (SR) SURF_ACE_SOUGHENING,INSTALLITLON_NOMS. 1, SEE PLAID VIE FM -LOCATIONS) OF SURFACE ROUGHENING. . SURFACE ROUGHENING SHALL. BE PROVIDED PROMPTLY AFTER COMPLETION OF RNISHED GPADING(FOR AREAS NOT REcErvaic 'TOPSOIL) OR PRIOR TO TOPSOIL PLACEMENT OR ANY FORECASTED RAIN EVENT, 3, AREAS WHERE BUILDING FOUNDATIONS, P A KENT, OR SC WILL BE PLACED 'fiiiiTHOUT DELAY IN THE coNsTRLITON SEQUENCE,. SURFACE ROUGHENIN IS NOT REQUIRED. . DISTURBED SURFACES SHALL DE ROUGHENED USING RIPPING OR TELLING EQUIPMENT ON THE CONTOUR OR T PEA KING UP .AND DOWN A SLOPE USING EQUIPMENT TREADS, 5.. A FARMING DISK SHALL. NOT DE USED FoR SURFACE ROUGHENING, URFA _S+ U ill G NIEtiANCE 1OT . 1. INSPECT E P9 EACH. WO R DAY, AND MAINTAIN THEM Iii EFFECTI `_ OPERATING CONDITION, MAINTENANCE F MVPs SHOULD BE PROACTIVE, NOT REACTIVE. INSPECT B Ps AS SOON AS POSSIBLE (AND ALWAYS `A'S WITHIN 24 !HOURS) ) FOLLOWING A STORM THAT CAUSES SURFACE EROSION AND PERFORM] NECESSARY MAN TENAN CE, 2. FREQUENT OBSERVATIONS .AND MAINTENANCE ARE NECESSARY TO MAINTAIN &ivPs IN EFFECTIVE OPERATING ONDIBOt41, INSPECTIONS ANI CORRECTIVE SSuRES SHOULD BE DOCUMENTED THOROUGHLY. 3F ?THERE B IPs HAVE FAILED, REPAIR OR REPLACE UPON DISCOVERY OF THE (FAILURE. VEIIMES .AND EQUIPMENT SHALL NOT BE DRIVEN OVER AREAS THAT HAVE BEEN SURFACE R U HENEl. 5,. IN NON TURF GRASS nmi Hro AREAS. SEEDING AND MULCHING SHALL TAKE PLACE DIRECTLY OVER SURFACE ROUGHENED AREAS WITHOUT nRsi SMOOTHINC OUT THE; SURFACE, 6. IN I EAS NOT SEEDED AND MULCHED AFTER SURFACE ROUGHENiNCv SURFACLS SMALL DE RE -ROUGHENED AS NECESSARY TO MAINTAIN GROOVE DOH AND SMOOTH OVER RILL EROSION SAILS ,kCAP I FROM TOWN OF PARKERa COLORAE10i, NOT AVAILABLE IN .AO R CC O NOTE; MANS' JURISDICTIONS HAVE BMP DETAILS THAT VAR' FROM UDFCD STANDARD DETAILS. CONSULT WITH LPL JURISDICTIONS TO WHICH DETAIL, SHOULD BE USED ViiiiHEN DIFFERENCES ARE NOTED SR -4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 m z O o. cc U W W H Q 0 >- z <Z <O UU o �w G I— < 0 _o 0 � �O O� z °- z� O z � <t z > O w_ = I - U <C ce O a_ X w _1 U Q Q I -I- 0 W < 0 � < O O0 �U w z~ wz OO JD W —I > W W 0 W Z PROJ: DESN: AC DRWN: GH CHKD: AC 11 Copyright: Tetra Tech Bar Measures 1 inch, otherwise drawing not to scale F E D W U Q 0 Q 0 0 ui w O z C7 U W w 2 m w L.L W W 2 C!) 0 Q U w LL U W O 0_ z O w U 0 r B U z U Q w U O 0 U U U Q w U 0 w A U 2 w eri 11/2112024 G Inlet Protection (IP) SECTION A FLOW —_ 1\_. CULVERT Ei+NR SECTION ROIL SOCK CULVERT INLET PROTECTION PLAN r 16#' MINN D "' FEIN.) i SC -6 stvg,,,e/ BACKER -I- UPSTREAM ROCK F WATTLE SOCK KEY IN ROCK SOCK xr CIN BEDROCK, PAVEMENT OR PIPRAP IDLY Ifs ROCK SOCK " r N EARTH SECTION B CIP�1. CULVERT INLET PROTECTION la SEE PLAN VIEW FOR —LOCATION OF CUILVERT INLET PR TEC110 Iv , SEE ROCK SOCK DESIGN DETAIL FOR ROCK GRADATION 'REQUIREMENTS AND JOINTING RETIE, LIL' ERT I I L T PR Tr X) Il N TEow E_ T 1. INSPECT Eitii, % EAC:Ihh WORKDAY!, Atio MAINTAIN THEM IN EFFECTNE OPERATING CON DITI0N MAEN ERO-IC4E � �F IariPs SHOULD DE PR ACT E, HOT REACTIVE. INSPECT BMPs AS 'SOON AS POSSIBLE (AND ALWAYS WITHIN 4 HiectiRS) FOLLOWING STORM THAT CAUSE SURFACE EROSION, AND PERFORM NECESSARY MAINTENANCE. F EQUENT OBSERVATIONS AND MAINTENANCE ARE NECESSARY TO MAINTAIN DAP t IN EFFECTIVE OPERATING ONDITION. INSPECTIONS AND C0 RE TI-vE MEASURES SKULL) BE DOC11MENTED THOROUGH , 3,, ERE: BM P's HAVE IF,AILER) REPAIR OR IREPLACEMENT SHOULD BE INMATE') UPON DISCOVERY OF THE FAILURE 4, SEDIMENT ACCUMULATED UPSTREAM OF THE CULVERT SHALL BE REMOVED WHEN THE SEDIMENT DEPTH IS h THE HEIGHT OF THE POCK SOCK 5. CULVERT INLET PROTECTION SHALL REMAIN IN PLACE UNTIL THE UPSTREAM DISTURSE0 AREA IS PERMANENTLY STABILIZED AND APPROVED BY THE LOS JURISDICTION. (ltrWLS ADAPTED FROM AURORA CO I, Nat invmueLe IN ►rove) NOTD! MANY JURISDICTIONS HAVE BMP DETAILS THAT VARY (FROM- UDFCD STANDARD ADE,TAI ., CONS LT WITH LOCAL, JURISDICTIONS AS TO WHICH DETAIL SHOULD BE USED WHIENI DIFFERENCES E ARE NOTED. August 2013 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 3 IP-7 SC -6 Inlet Protection (IP) IIl1LET P'P TE 16 T;A.LLA y DL SE RAN VIEW FOR: —LOCATION Or INLET P ROTE TON. �TYPE OF iN1LET PROTECTiON ORi is ➢Po2, IR3, IPAI IP; 54 IPA) 2. INLET P'ROTE:CTIO-N SHALL BE INSTALLED PROMPTLY AnER INLET coNsmucropi OR PAVING IS COMPLETE (TYPICALLY WITHIN 48 HOURn IF A RAINFALI., UNOFF EVEliT ire, FORECA Ta INSTALL FILET' PROTECTION PRIOR TO ONSET OF EVERT:, 3, follAIW JURII DIICTI .N HAVE BIMP DETAILS THAT VARY' FROM ► ORD STANDARD DETAIL& CONSULT WITH1 LOCAL JUIRMENCTIONS AS TO WHICH DUAL SHOULD BE USED it MEIta DI FFEREN E AIRE N TEFL N1L'�+L1TEICELI�Ti 1. INSPECT BMPs EACH OR! DDAYI AND M.AINT IN THEM IN EFFECTIVE OPERATING CONDITION& [MAINTENANCE OF SMPs *nun P'ROACTIVE.t NOT REACTIVE ENSPE;T MIPS AS SOON AS IPCISSIELE (AND ALWAYS WITHIN 24 HOURS) FOLLOWING A STORM THAT CAUSES URF E ERR I Nt AND PERFORM NECESSARY MAINTENANCE; 2., FREQUENT OBSERVATIONS AND MAINTENANCE E RE NECESSARY 'MI MAINTAIN EiMPs iN EFFECTIVE OPERATING ONDITIONL INSPECTIONS AND CORRECTIVE: MEASURES SHOULD BE DO CU MEWED THOROUGHLY. .3a WHERE BMPs HAVE FAILED, RE,F!A R OR REPLACEMENT SHOULD BE MUTATED UPON' DISCOVERY OF THIS FAILURE. 4. SEDIMENT „ACCUMULATED' UPSTREAM OF NMI PROTECTION SHALL BE REmovco NIECES ARY TO MAINTAEN P EFFECTIVENESS, N TYPICALLY WHEN STOR'ACE VOLUME REACHES OF CAPACITY, A DEPTH OF 6" WHEN SILT FENCE IS USED, OR 34 F' THE HEIGHT FOR STRAW DES; 5a INLET PROTECTION IS TO REMAIN IN PLACE UNTIL THE UPSTREAM DISTURBED AREA, IS PERMANENTLY STABILIZED, UNLESS THE LOCAL. JURISDICTION APPROVES EARLIER REMOVAL OF INILU PROTECTION IN STREET& 6. WHEN INLET PROTECTION AT AREA INLETS IS REM O , THE D T IREED AREA SHALL RE COVERED WITH TOP SCIIL, SEEDBED AND MULCHED OR OMIER wISE STABILIZED IN A MAILER APPRO.VED BY THE LOCA. JU 1DI '�TIONI, @ail% ActAnto NON TOwrii PARMA ,I.0-1 MO WV OF AURORA]] CAS . NOT AVAIL LC TCAD) COTE:, MANY JURISDI TIIONS HAVE RIMP DETAILS THAT VARY FROM LE DM) STANDARD DETAILS. CONSULT WITH LOLL, JUREDIICTIONS AS TO WHICH DETAIL SHOULD BE: USED WHEN 'DIFFERENCES ARE ► OTED; ItAIOTEt, THE DETAILS INCLUDED WITH THIS FACT SHEET :MOW COMMONLY USED,, CONVENTIONAL METHODS OF INLET' PROTECTION ICI THE DENVER METROPOLIT' N AREAREk THE ARE MANY (PROPRIETARY INLET' PROTECTION' METHODS ON THE MARKEL UDF'CD (NEITHER ENDORSES NOR, DISCOURAGES USE OF PROPRIETARY INLET P'RDTEDTIOlt HOWEVER, IN THE EVENT PROPRIETAIRY ME-THODS ARE USED, THE AP'PROPRIIATE DETAIL FROM THE MANUFACTURER: MUST BE IN LURED IN THIE SWMP MID THE RNIIP MUST BE INSTALLED AN n MAINTAINED AS SHOWN IN THE MANUFACTURER'S DETAILS!, SOME MUNICIPALITIES ALITI``IIE; DISCOURAGE OR PROHIBIT THE: LI r, OF Ir1R.A, ' BALE,S FOR INLET PROTECTION. CHECKWITH' LOCAL JLIIRIISDE TION TO DETERMIINE IF STRAW DALE DEFT RRDTECI1ON I ACCEPTABLE,. IP-8 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 3 August 2013 m z O 0_ U W 0 W Q Q 2 Z 0_ QO UU z w0 2I— < ° 0 �O O � z� z� o z w Z 0 UQ O 0_ w H J U � O 0 wQ QO CC J Z z W � 0 0 W J > W D W Z PROJ: DESN: AC DRWN: GH CHKD: AC 12 Bar Measures 1 inch, otherwise drawing not to scale TETRA TECH January 22, 2025 Lauren Light Environmental Health Services Weld County Might@weld.gov RE: Noise Evaluation Letter, USR for Proposed New Development Storage Facility, PRE24-0270 Dear Ms. Light: This letter provides a preliminary evaluation of the potential noise levels associated with the proposed project at 35695 Co Rd 47, Eaton, CO 80615, as they relate to neighboring properties. The evaluation is based on the Traffic Narrative, data from the Federal Highway Administration, and Weld County Code requirements. Chevron is proposing Site -Specific Development Plan and Use by Special Review Permit for Oil and Gas Support and Service (Material Storage Yard, specifically for recycled road base, riprap, etc.) outside of subdivisions and historic townsites in the A (Agricultural) Zone District, located near the intersection of weld County Road (WCR) 47 and WCR 74. The proposed facility is situated within an area characterized by a mix of agricultural activities and oil and gas operations. Industrial uses associated with oil and gas operations occur on adjacent parcels to the north, east, and south of the site. The closest residences are approximately 1,550 feet north, 1,500 feet south, 1,750 feet southeast, and 2,300 feet northeast of the site. The facility is situated as far as possible from residences within the constraints of the parcel. This noise evaluation is meant to preemptively address concerns regarding the potential noise impact from the semi -truck traffic associated with the proposed project. Specifically, to address the possibility of disturbances to nearby residences from the daily operations involving up to 20 semi -trucks. Maximum Noise Levels The maximum permissible noise levels applicable to the proposed project per the weld County, Colorado, Charter and County Code, Sec. 14-9-40, are listed in Table 1. Table 1: Maximum Noise Levels per Weld County Code Land Use Maximum Noise NEIN Maximum Noise (dB(All 7:00 a.m. - 9:00 p.m. 9:00 p.m. - 7:00 a.m. Industrial Area or Construction Activities Public Rights -of -Way, Vehicles over 10,000 lbs 80 dB(A) 90 dB(A) 75 d B (A) * 90 dB(A) *Between the hours of 9:00 p.m. and 7:00 a.m., the noise level may be exceeded by up to 10 decibels for up to 15 minutes in a one -hour period. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 I tetratech.com Noise Evaluation Letter USR for Proposed New Development Storage Facility, PRE24-0270 January 22, 2025 wCR 47 and WCR 74 do not have posted speed limit signs near the site and therefore default to the Weld County Road speed limit of 55 mph. According to the Federal Highway Administration', semi -trucks weighing over 26,400 lbs. are classified as "heavy trucks." At 55 mph these trucks have an average noise emission of 84 dB(A) measured 50' away from the source, which is below the maximum 90 dB(A) permitted by County code within the public rights -of -way (see Figure 1). Once trucks have turned onto the private drive within the site, speeds will be at or below 25 mph and the average noise level drops to 76 dB(A) or less as measured 50' away from the source, staying below the maximum of 80 dB(A) permitted by County code for an Industrial Area or Construction Activities. Because the active site areas will be more than 1,500' away from any residences as noted above, the actual noise emissions experience by neighboring property owners will be much lower. Figure 1: Average Noise Emissions at 50', by Vehicle Type and Speed' Truck Traffic Distribution and Noise Minimization Measures In addition to meeting the maximum noise thresholds required per County code, the semi -truck operations at the proposed facility will have minimal noise impacts due to several operational factors. 1. Staggered Traffic Throughout the Day: As indicated in the Traffic Narrative memorandum prepared by Tetra Tech, semi -truck trips are distributed evenly throughout a 10 -hour shift, with approximately two trucks arriving per hour. This staggered schedule significantly reduces the likelihood of noise disturbances caused by concentrated traffic during peak hours. TETRA TECH Noise Evaluation Letter USR for Proposed New Development Storage Facility, PRE24-0270 January 22, 2025 2. No Overnight Parking or Idling on Site: The proposed storage yard does not accommodate overnight parking for trucks. Consequently, there will be no idling or engine warm-up noise during early morning hours. This operational limitation ensures that ambient noise levels remain consistent with local residential expectations during sensitive ti mef ra mes. 3. Operational Hours Align with Daytime Activities: All truck operations will occur during daytime hours, with no truck activity planned during nighttime. This schedule is consistent with County regulations as noted above and contributes to minimizing potential noise impacts during periods when residents are more likely to be affected. 4. Short -Term Parking and Turnaround: Trucks visiting the site will only stay for the time necessary to load or unload materials. These short - duration visits reduce potential noise from prolonged on -site presence, such as unnecessary engine idling or mechanical operation noises. Conclusion The proposed facility operations and associated traffic will not exceed the maximum noise levels set forth by Weld County either on -site or on adjacent public roads. Given the additional operational practices described above, the semi -truck traffic associated with the proposed facility is not anticipated to generate significant noise disturbances to nearby residences. The staggered scheduling of truck arrivals and the prohibition of overnight idling effectively mitigate potential noise impacts. Sincerely, TETRA TECH Amy Conway, LEED AP, AICP Senior Planner, Project Manager References: 1 U.S. Department of Transportation, Federal Highway Administration. (December 2023). Technical Manual, Traffic Noise Model 3.2, Appendix B: Vehicle Noise Emission Levels. https://www.fhwa.dot.gov/environment/noise/traffic_noise_model/tnm_v32/tnm32-technical-manual- 2023.pdf TETRA TECH TETRA TECH Transportation emo a e 1E To: Weld County Development Review, Attn: Mike McRoberts Cc: Kyle Myers, Project Management, Chevron Rockies Business Unit From: Amy Conway, LEED AP, AICP Candidate; Lily Vagelatos, P.E. Date: December 2, 2024 Subject: Chevron North America Exploration and Production Company Proposed New Development Storage Facility, Weld County USR Application Traffic Narrative Chevron North America Exploration and Production Company (Chevron) is proposing a new materials storage yard location in support of its Colt, Maverick, and West Pony development areas. Currently, materials such as recycled road base, riprap and other similar construction aggregates are stored at Chevron's LaSalle yard located off Weld County Road (WCR) 49 and WCR 46, approximately 13.5 miles south of the proposed development storage area. This location is easily accessed for the Maverick development area but requires significantly more hauling distance to distribute materials to the Colt and West Pony development areas. The new proposed storage facility is located southwest of the intersection of WCR 47 and WCR 74 and will reduce travel distance during construction at the three development areas (Figure 1). Chevron has contracted services from Tetra Tech Inc. (Tetra Tech) to support their Use by Special Review (USR) permitting process. This memorandum has been prepared to provide a narrative description of the local traffic impacts anticipated for the proposed storage facility. Impacts are based on a desktop review of the area, and information provided to Tetra Tech by Chevron for their development plans. A field traffic survey was not performed in support of this evaluation. Table 1 provides a summary of the traffic narrative findings. TETRA TECH 351 Coffman St, Ste 200, Longmont, CO 80501 Tel 1.303.772.5282 I tetratech.com Chevron New Development Storage Facility Traffic Narrative Memorandum December 2, 2024 Table 1. Summary of Traffic Narrative Findings. Traffic Narrative Item Description Summary Information 1 Number of round trips per day based on vehicle type (a) Passenger cars/pickups Tandem trucks Semi-trucks/trailer/RV 20 0 42 2 Expected travel routes (b) From West Pony From Colt Vehicles traveling westbound on State Highway (ST HWY) 14 will exit southbound onto County Road (CR) 47, and turn right into the facility. Vehicles will travel westbound on ST HWY 392, exit northbound onto CR 47, and turn left into the facility. From Maverick 3 Travel distribution 4 Time of day for highest traffic volumes (c) Vehicles will travel northbound on US HWY 85, exit eastbound onto ST HWY 392, exit northbound onto CR 47, and turn left into the facility. It is anticipated that approximately 30% of the traffic accessing the site will do so from the West Pony development area to the northeast, and the remaining 70% of the traffic will access the site from the Colt and Maverick development areas east-southeast and south respectively. Passenger vehicles and light duty truck traffic will be highest in the morning and evening aligned with the onsite operations crews (accessing the site in the morning between 7 and 8 am and leaving the site in the evening between 5 and 6 pm). Semi -truck traffic will occur throughout the day and is anticipated to be intermittent based on the construction needs at the development areas. Notes: (a) Refer to Table 2 for additional vehicle count information. (b) Refer to Figure 1 for regional development areas. The proposed facility will service multiple development areas and well pads, and routes accessing the facility will vary slightly pad to pad. Information provided in this table is a summary main arterial routes to be used. (c) Refer to Table 2 for anticipated peak morning and evening traffic forecasts. TETRA TECH 4 Chevron New Development Storage Facility Traffic Narrative Memorandum December 2, 2024 I ' iyin...4.1 111111116 n TETRA TECH 1M1I)1M.OetTateCh.Con1 351 Ccfran Steet. Sute SC Lommont Co►ormo WW1 � 3C 3)772 5S Ft D 1 \--211„1:1 Legend SymbolID PROPOSED NEW DEVELOPMENT STORAGE YARD PARCEL EXISTING CHEVRON LASALLE STORAGE YARD (USR-1570? WELD COUNTY BOUNDARY CHEVRON'S REGIONAL DEVELOPMENT AREAS -1 MAVERICK 0 COLT E-, ?VEST PONY PUBLIC ROADS STATEIFEDERAL HIGHWAYS b INTERSTATES COUNTY ROADWAYS MUNICIPAL ROADWAYS N CHEVRON. INC WELD COUNTY, COLORADO COMPARING REGIONAL DEVELOPMENT AREAS TO EXISTING & PROPOSED DEVELOPMENT STORAGE YARD LOCATIOtIS Pto}[c£ No 117-711500: DXe OCTOBER 15.2=: Desire° By: AY. Fla No. 1 TETRA TECH 2 Chevron New Development Storage Facility Traffic Narrative Memorandum December 2, 2024 Current Conditions The existing parcel is currently a mostly vacant non -irrigated agricultural -zoned piece of land that has oil and gas wells in multiple locations. A Subdivision Exemption lot was created around DCP's NorthStar Compressor Station (SUBX18-0001) and is now located entirely within a separate, adjacent parcel (Figure 2). Parcel B Parcel A Shared Access Easement • Itarcel C DCP'NorthStar Compressor Station (SUBX18-0001) 'ill , _in , , Maxar, Microsoft, EsriGlunit Glom Maps tlitNitOllgittaris.); Es1ri,TO- • 5i_jfeGraph, GeoTec lloologtes, Ins METI, NASA; USG5, EPA •T1 I Figure 2. Generalized Site Layout The existing main access to the DCP NorthStar Compressor Station is an industrial site access permitted by Weld County (permit numberAP18-00056). The planned permanent access was never constructed. The proposed storage facility will extend the existing access to the area to be developed (Figure 2). No additional public road construction or improvements to county roads is planned as part of this development as the existing access is of sufficient quality and dimensions for the trucks and heavy equipment that will be used. The DCP NorthStar Compressor Station is an unmanned site. One DCP technician visits the site daily to ensure quality control. Technician visits are not part of shift work and are assumed to occur outside peak traffic hours. TETRA TECH 4 Chevron New Development Storage Facility Traffic Narrative Memorandum December 2, 2024 Facility Improvements Construction of the facility will take approximately 1 month to complete. Construction volumes are considered to be a temporary use, and do not factor into long term changes to the site access. However, the following general uses are anticipated during construction: • Day 1- Haul in heavy equipment including a bulldozer blade and a wheel tractor scraper. This will require two loads with lowboy semi -trailers. 4 employees will be needed on -site which include the heavy equipment operators and the semi -truck drivers. • Day 2 through 4 - Construction crew access including 2 heavy equipment operators and 3 roustabout crew members onsite. • Day 4 through 14 - A soil compactor will be hauled to the sight via low -boy semi -trailer on day 4.15 semi -trucks will deliver 6 loads of road base each day. Additionally,1 water truck will make 4 rounds trips each day to the site to mitigate dust from the construction activities. There will be 18 employees needed on site each day including 16 truck drivers and 2 heavy equipment operators. • Day 15 through 30 -15 semi -trucks will bring 6 rounds of new road base into the site each day and 1 water truck will continue to bring in 4 loads of fresh water each day for dust mitigation. There will 20- 22 employees needed on site during this period of construction and will include 16 truck drivers, 2 heavy equipment operators, and up to 6 roustabout employees needed for seeding and rip rap spreading. Heavy equipment will be removed from the site at the completion of construction activities using low -boy semi -trailers the same as for delivery to the site. Once completed, the proposed site will include two office trailers, a graded outdoor storage and staging area approximately 10 acres in size. The internal access road is considered private property, and extension and improvements would not be part of the access permit or maintenance agreement with the County. The proposed facility will have daytime operating hours only and will be open six days a week (Monday through Saturday). Up to 55 people will access the site daily during peak activity. There will be five to seven full time employees on site each day. On any day, up to three supervisors might visit the site while the yard is in operation. The office trailers will be used for one monthly meeting that may have up to 25 attendees. Additionally, there will be up to 20 semi -truck (belly dump trucks or tandem dump trucks) drivers delivering and picking up loads of material intermittently throughout the day. Multiple vehicles will be used or temporarily stored on site. These vehicles include a loader, a bulldozer, and a motor grader for loading/unloading and moving storage materials to their proper locations in the yard area. Delivery or retrieval of these vehicles from the site would be completed as oversized loads. Oversized loads would be scheduled for off -hours. Vehicles used onsite that would not use the access include: askid-steer (mainly used for mowing & stormwater repair work), a tractor (for weed spraying) and a water truck (for dust mitigation). Table 2 presents a summary of the anticipated maximum daily traffic, and the morning and evening peak hour traffic volumes. These traffic volumes are based on routine operations, and do not use the monthly meeting volumes as those values are expected to vary from month to month and are not suitable for TETRA TECH 4 Chevron New Development Storage Facility Traffic Narrative Memorandum December 2, 2024 infrastructure planning purposes. In addition, there will be intermittent access to the facility for trash, recycling, and portable toilet servicing. While the schedule for these activities has not been established, it is anticipated that they would increase traffic by 8 PCE per week -1 trash truck (2 PCE) in and out, and one portable toilet maintenance truck (2 PCE) in and out. These activities would not occur during peak hours. Table 2. Anticipated maximum daily traffic volumes. CDOT SHAC Vehicle Equivalency Type Factor (PCE/Vehr Maximum Vehicles Per Day Daily Veh Trips (PCE) Morning Peak Hour Trips (PCE) Evening Peak Hour Trips (PCE) Entering Exiting Entering Exiting Light Duty Semi -truck Oversized Load 1 11 3 20 22 (22) 40 (120) 9 (9) 2 (6) 3 1 2 (s) o (o) o (o) o (o) 2 (s) o (o) o (o) Daily Traffic Summary: 32 64 (148) 10 (15) 3 (7) 2 (6) 10 (14) Notes: PCE - Passenger car equivalent, CDOT - Colorado Department of Transportation, SHAC - State Highway Access Code. 1- CDOT SHAC assumes: Light duty/passenger vehicle < 20ft, semi-/oversized/multiple unit truck > 40 ft;1 Combo Unit truck = 3 PCE. Peak hour movement assumptions include: • The seven full time employees access the site in the morning and leave in the evening. • Supervisors accessing the site are distributed during the day and may not be onsite for the full shift. Trip counts include 2 supervisors entering the site and one leaving in the morning, and one supervisor leaving in the evening. • Semi -truck traffic was distributed evenly through the day (2 trucks an hour over a 10 -hour shift). Actual timing of trucks will vary depending on associated construction activities at the nearby development areas. Conclusion The Weld County code of regulations was reviewed for applicable constraints and requirements. Per the code regulations of access onto County roadways (section 8-14-30), the proposed facility would constitute a change in use of the existing access. The type and classification of the access will remain the same as current, but the amount of traffic will increase. An updated permit and road maintenance agreement may be required. TETRA TECH 4 TETRA TECH WELD COUNTY -USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 20. WASTE HANDLING PLAN 1. Any general office waste generated on -site will be collected in a trash dumpster on -site. A service provider will be scheduled to pick up as needed and take it to: North Weld Landfill 40000 WC R 25 Ault, CO 80610 970-686-2800 2. No permanent disposal of wastes will take place at this site. 3. Fugitive dust, blowing debris, and other nuisance conditions will be minimized during construction. 4. The applicant's operations will be in accordance with the approved Waste Handling Plan. 5. No chemicals are planned to be stored on -site. Diesel for earth -moving equipment will be transported to the site in slip tanks on pickup trucks. 6. All development standards will be adhered to. TETRA TECH 51 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com TETRA TECH WELD COUNTY USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 14. SURFACE USE AGREEMENT Statement of adequate incorporation of all oil and gas surface activities per Section 23-2-160.2 of the Weld County Code: Per section 23-2-160.Z Noble Energy Inc. (Chevron) has worked with all Oil and Gas surface use owners to make sure the proposed development will not have an adverse impact on the existing and future oil and gas activities on the subject property. In discussions with DCP Operating Company LP (DCP), Chevron has incorporated into the design of the fill storage yard a 100 -yard buffer from DCP's surface use compressor station to limit impacts of dust on the compressor filters that are used on site. Chevron is both the surface owner and has leased the mineral estate via oil and gas leases and has all development rights. All oil and gas activities on the subject property have been adequately incorporated into the design of the site. TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com TETRA TECH WELD COUNTY USE BY SPECIAL REVIEW CHEVRON NORTH AMERICA EXPLORATION AND PRODUCTION COMPANY PROPOSED NEW DEVELOPMENT STORAGE FACILITY 13. OWNER -OPERATOR LIST Names and Addresses of all Owners/Operators of Oil and Gas Rights, Ditches, Overhead Power and Railroads on Parcel 0803-02-0-00-066 Interest Owners Names Incline Minerals II, LLC Noble Energy, Inc. Type of Interest Mineral Rights Owner (4986781, 4981327) Various Oil and Gas Leases and Operating Agreements DCP Operating Company LP Surface Lease Agreement (4341157)1105' Permanent Pipeline Easement (4467793), Access Easement (4341157) Oil & Gas - 30' Pipeline Easement (4102449) Laramie River DevCo LP Oil & Gas - 30' Pipeline ROW (4331286) DCP Midstream LP CEA Greely, LLC Owner Address Information 4645 N. Central Expressway, Suite 100 Dallas, TX 75205 1099 18th Street, Suite 1500 Denver, CO 80202 370 17th St, Suite 2500 Denver, CO 80202 Oil & Gas - 20' Pipeline Easement (4655231) Public Service Company of Electric Utility/Overhead Colorado Power - 5' Electric Easement 3026 4th Avenue Greeley, CO 80631 1625 Broadway, Suite 2200 Denver, CO 80202 707 E Main Street, 15th Floor Richmond, VA 23219 Overlaps with Parcel B (the Project Site)? Yes Yes Pipeline easements only Yes 1800 Larimer St Ste 1400 Denver, CO 80202 Yes No No TETRA TECH 351 Coffman Street, Suite 200, Longmont, CO 80501 Tel +1.303.772.5282 Fax +1.303.772.7039 tetratech.com Weld County Treasurer Statement of Taxes Due Accomit Number- R0187789 Parcel 080302000066 Legal Description 13556 NE4 2 6 65 EXC BEG N4 COR OF SEC S88D31'E 400' S1251.37' N88D31'W 400' TO W LINE NE4 N1251.37' TO BEG (3.72R) Situs Address 35659 COUNTY ROAD 47 WELD Account: R0187789 NOBLE ENERGY INC 1625 BROADWAY STE 2000 DENVER, CO 80202-4720 hfio Matt iii■■■■■■■■■■■■Man MTh ■■■■■■■■■ ■■■■■■■■■ ■■■■■■■■■ Man MTh ■■■■■■■in ■inian n ■n• •■■■ Year Tax Charge Tax Interest 2023 $2,279.06 Fees Payments Balance $0.00 $0.00 ($2,279.06) $0.00 Total Tax Charge $0.00 Grand Total Due as of 05'20/2024 S0.00 Tax Billed at 2023 Rates for Tax Area 3879 - 3879 Authority WELD COUNTY SCHOOL DIST RE2-EATON NORTHERN COLORADO WATER (NC GALETON FIRE AIMS JUNIOR COLLEGE HIGH PLAINS LIBRARY WEST GREELEY CONSERVATION Taxes Billed 2023 * Credit Levy Mill Lehr 12.0240000* 33.1000000 1.0000000 4.0000000* 6.3360000 3.1960000 0.4140000 Amount $456.20 $1,255.81 $37.94 $151.76 $240.38 $121.26 $15.71 60.0700000 $2,279.06 Values REFINING/PETROLEU M -LAND AG -FLOOD IRRRIGATED LAND Actual Assessed $49,525 $13,820 $91,348 $24,120 Total $140,873 $37,940 ALL TAX LIEN SALE AMOUNTS ARE SUBJECT TO CHANGE DUE TO ENDORSEMENT OF CURRENT TAXES BY THE LIENHOLDER OR TO ADVERTISING AND DISTRAINT WARRANT FEES. CHANGES MAY OCCUR AND THE TREASURER'S OFFICE WILL NEED TO BE CONTACTED PRIOR TO REMITTANCE AFTER THE FOLLOWING DATES: PERSONAL PROPERTY, REAL PROPERTY, AND MOBILE HOMES - AUGUST 1. TAX LIEN SALE REDEMPTION AMOUNTS MUST BE PAID BY CASH OR CASHIER'S CHECK. POSTMARKS ARE NOT ACCEPTED ON TAX LIEN SALE REDEMPTION PAYMENTS. PAYMENTS MUST BE IN OUR OFFICE AND PROCESSED BY THE LAST BUSINESS DAY OF THE MONTH. 1400 N. 17th Avenue, Greeley, CO 80631 or PO Box 458, Greeley, CO 80632. (970) 400-3290 Page 1 of 1 Weld County Treasurer's Office 1400 N 17th Avenue PO Box 458 Greeley, CO 80632 Phone: 970-400-3290 70/g77 - 0303-02-o-oo- oelo Pursuant to the Weld County Subdivision Ordinance, the attached Statement of Taxes Due issued by the Weld County Treasurer are evidence that as of this date, all current and prior year taxes related to this parcel have been paid in full. Signed: Date: o� Hello