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Home My WebLink About20251265.tiffDocusign Envelope ID: 93906FF3-D117-4F97-ABD6-7679AC0096DA Use by Special Review (USR) Application Planning Department Use: Date Received: Amount $ Case # Assigned: Application Received By: Planner Assigned: Property Information (Attach additional sheets if necessary.) Proposed use: Electric substation and transmission lines Is the property currently in violation? igJ No / ■ Yes Violation Case Number: S ite Address: Weld County Road 15 and 60 Parcel Number: 0 9 5 7. 0 7. 1 _ 0 0. 0 0 1 Legal Description: N E4 7 5 67 Section: 7 , Township 5 N, Range 67 VII Zoning District: A Acreage: 6 Within subdivision? IN No / ■ Yes Townsite? K1 No / ■ Yes If yes, subdivision or townsite name: Will be subdivided into 6 -acre parcel with a PFD in concurrence wtih this application. Floodplain No / Yes Geological Hazard No / Yes Airport Overlay No / ■ Yes Ix ■ ■ P roperty Owner(s) (Attach additional sheets if necessary.) N ame: Martin Lind, Viki Lind GI Company: Vima Partners, LLC Phone #: Email: Street Address: 1625 Pelican Lakes Point, Sute 201 City/State/Zip Code: Windsor, CO, 80550 N ame: Company: Phone #: Email: Street Address: City/State/Zip Code: Applicant/Authorized Agent (Authorization must be included if there is an Authorized Agent.) N ame: H. Steven Gray Company: Tri-State Generation & Transmission Association, Inc. Phone #: 303-254-3649 Email: steve.gray@tristategt.org Street Address: 1100 W. 116th Ave, City/State/Zip Code: Westminster, CO, 80234 (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our) knowledge. All fee owners of the property must sign this application, 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 legal authority to sign for the corporation. r DocuSi ned by: /7 1/6/2025 °m— BF3F53863F7F454... Signature Date Signature Date H. Steven Gray, Senior Manager, Land Rights & Permitting Print Tri-State Generation and Transmission Association, Inc. Print 02/24 9 Vinna Partners, LLG I, (ube), (Owner -- please print) Authorization Form give permission to (Authorized Agent/Applicant-please print) departments of Planning Building, Development Review and Environmental Health 1402 North 1 in, Avenue P.O. Box 758 Greeley, CO 80632 Tri-State Generation and Transmission Association, Inc to apply for any Planning, Building, Access! Grading or OWTB permits on our behalf, for the property located at (address or parcel number) below: Parcel No. 095707104001 Legal Description: NE 1/4 of Section 7 , Township 5 N, Flange 67 W Subdivision Name: N/A Lot N/A Black N/A Property Owners Information: Address: 1625 Pelican Lakes Point, Suite 201 Phone: 970-217-1948 E-mail: Authorized Agent/Applicant Contact Information: Address: 1 loo W. 116 Avenue, Westminster, CO 80234 marissa7277@yahoo.com Phone: 303-229-3207 E -Mail: selina.koler@tristategt.org Correspondence to be sent to: Owner, Authorized Agent/Applicant x by: Flail Email X Additional Info: I (We) hereby certify, under pr nattyl of perjury and after carefully reading the entire contents of this document, thy► he informati n s d above is true and correct to the best of my (our) knowledge, Date -WV}_ Date Owner i•nature Owner Signature Subscribed and sworn to bme this 944)- day of IUIy commission expires 02/24 LAURA D. WYNN (rotary Public State of Colorado Notary ID*20044032091 20044032091 ,.�► Commission Expires 09-09-2024 11 Please include a typed self-addressed envelope MUST BE TYPED FILING FEE: $50.00 SUBMIT TWO COPIES Mail to: Secretary of State Corporations Section 156O Broadway, Suite 200 Denver, CO 80202 (303) 894-2251 Fax (3O3) 894-2242 o. For office use only FILED to' trrA DAMSON RADC SECRETARY OF S'I'ATe 2n021009491 9 49'x. PI y;e 1.; :3: :r:: -: «.- a SECRETARY OF ., tif�:. 4 3 w fir`. •'ti h '-7 7 r' : a L I OF. r . .w w. ..r .•• w w. REGISTRATION STATEMENT FOR REGISTRATION AS A REGISTERED LIMITED LIABILITY PARTNERSHIP OR A REGISTERED LIMITED LIABILITY LIMITED PARTNERSHIP ay .w w w . •• M Pursuant to section 7-60-144, Colorado Revised Statutes, the undersigned partnership* has approved this registration statement in the manner provided in its partnership agreement or, if not so provided, such statement has been approve( by all of its general partners as follows: The name of the partnership is Pavistma Partners If different, the name which it proposes to register, or, if foreign, the name which it proposes to transact business in Colorado is Pavistma Partners, LLP The jurisdiction of its formation (if other than Colorado) is The street address of its principal office is. 305 Teal Ct., Windsor, CO 80550 If the principal office of a general partnership or a foreign limited liability partnership is not in Colorado, the name and street address of its Colorado registered agent for service of process on such general or foreign partnership is: Last name of an individual or full name of an entity First and middle name of an individual Street address of registered agent named above Signature * As used in this statement, partnership refers to a general partnership or a limited partnership formed in Colorac or a foreign limited liability partnership or limited liability limited partnership formed and registered in a jurisdiction other than Colorado. If formed in Colorado, a limited partnership must first or simultaneously file a Certificate of Limited Partnership, and if formed elsewhere, it must also file an Application for Registration as a foreign limited partnership wid the Colorado Secretary of State. ■ \doc\Corporate\RBS\Lind\Pavistma Partners\Registration Statement.doc 4977711 08/21/2024 08:10 AM Total Pages: 2 Rec Fee: $18.00 Carly Koppes - Clerk and Recorder, Weld County , Co STATEMENT OF AUTHORITY Order No.: HS0834406ME3 1. This Statement of Authority relates to an entity' named Vima Partners, LLC1 a Colorado Limited Liability Company, and is executed on behalf of the entity pursuant to the provisions of Section 38-30-172, C.R.S. 2. The type of entity is a: D Corporation D Nonprofit Corporation Ci Limited Liability Company D General Partnership D Limited Partnership ❑ Registered Limited Liability Partnership Registered Limited Liability Limited Partnership D Limited Partnership Association ❑ Government or Governmental Subdivision or Agency ❑ Trust 3. The entity is formed under the laves of Colorado. 4. The mailing address for the entity is 1777 Long Shadow Dr, Windsor, Co 80550-3032. 8. The El name EZ position of each person authorized to execute instruments conveying, encumbering, or otherwise affecting title to real property on behalf of the entity is: Martin Lind, Member andfor Viki Lind, Member and Manager 0. rilie authority of the foregoing person(s) to bind the entity is El not limited ❑ limited as follows: 7. Other matters concerning the manner in which the entity deals with interests in real property: IN WITNESS WHEREOF, Vima Parers, Compa BY: Martin Lind e undersigned have executed this document on the date(s) set forth below. C orado Limited Liability ember and Manager Statement of Authority COD1038.doc / Updated: 03.09.23 Page 1 4977711 08/21/2024 08:10 AM Page 2 of 2 STATEMENT OF AUTHORITY (continued) State of Colorado } iss County of VISLI> The for oing instrument was acknowledged before me this 19th day of August, 2024 by Martin Lind, Member and Mana e , on be elf of yyna Partners, LLC, a Colorado Limited Liability Company, a Limited Liability Company and ackedged o m th t he/she executed the same. of ry Public My Commission Expires_ (SEAL) r LA RA D. WYNN Notary Public Mate of Colorado Notary to #20044032091 My Commission Expires 09-09-2024 ... •.. s.im`: ^.:.... IN .•,euetsI 404.0 inas_ •.y}:q✓>*� 'This form should not be used unless the entity is capable of holding title to real property. 2The absence of any limitation shall be prima facie evidence that no such limitation exists. The statement of authority must be recorded to obtain the benefits of the statute. Statement of Authority COD1038.doc / Updated: 03.09.23 Page 2 JAN -22-2003 WED 04:22 PM FAX NO. r. w r ;' t7•\Wr+� t Vt.:....1 AI CENDMENT TO ARTICLES OF ORGANIZATION Form 405 Revised July 1, 2002 Filing fee: S25.00 Deliver to: Colorado Secretary of State Business Division 560 Broadway, Suite 200 Denver, CO 80202-5169 This document must be typed or machine printed Copies of filed documents may be obtained at wavw.soods atc.co.us 4DOVe PLLC, ;00 ga /O 9 Y9 ( Pursuant to § 7-80-209, Colorado Revised Statutes (C.R.S.), the individual named below causes this Amendment to the Articles of Organization to be dolivGrccl to ltic Colorado Secretary of State for filing, and states as follows: cbick4 "l- -Ca4 11 kaeal 4'44. 20031025041 2s2n0 SECRETARY OF STATE 15:15;50 15Prlt;:c. rum want:r: U2fal uNtay P. 03 The name of the limited liability company is: ,. . Pavi st ma Partners, LLC The /Articles of Organization shall be amended as set_ forum Herein (mark ail that cppl y): ;14 There is a change lil the name of the limited liability uumpany to:.,nn vnvIA. Partners, „X,LC The entity mono of limited liabilisy company must contain the term "limited liability company", "ltd. liability company", "ltmited liability co.", or "ltd, liability co." or'the abbreviation "MA:" or "Lida C3 There is a false or erroneous statement in the articles of organization: • The (a) name or manes, and (b) mailing address or addresses, of any one or more of the individuals who cause this document. to be delivered .for filing, and to whom the Secretary of Mate may delivor notice if filing of this document is refused, are: ..Russell B. Sanford, (du, !Mater V'alley�1625 Pelican Lakes Point, Saute 201, Windsor, CO 80550 OPTIONAL. The el ectroni a man and/or Tnternet address for this entity is/are: e-mail ... 'eh site w- The Colorado Setzetary of State may contact the following authorized person regarding this document. name .. ._ address _ _ -- voice fax _ e -mall 1islv:rhna Partners, LtekAmendment to Articles of Organitation.doc Disclaims= Tbk Wm. and may alntcd ingtastktttS at au 'Nadal to srovide legal, batioees or obi a4vlee, grid are oAtrod as a public savico wit= rcyrocuation or wxrrnnly. farms it holland w 1utM? miAhnium led rovira atta to of ilb maim autos m aga= with zp?licAblo as tits unto ttWy bo antautod from lime to timcl romans the rppanibitiay Oldie ulte Or%IS RUM Quauan5 aitourd to ttddroatod to the WC?. SttosItcy Received 01-22-2003 14:18 From- To -Colorado Secretary o Page 003 •.:7s -t• tat Iron Mountain Delivery Point Project 1041 and USR Permit Application Questionnaires Submitted to: Submitted by: Prepared by: Weld County Planning and Zoning Department of Planning Services 1555 N. 17th Ave. Greeley, CO 80631 Tri-State Generation & Transmission, Inc. 1100 W 116th Ave. Westminster, CO 80234 Selina Koler and Isabella Beshouri Department of Land Rights and Permitting 1100 W 116th Ave. Westminster, CO 80234 TABLE OF CONTENTS List of Acronyms and Abbreviations 7 Project Overview 8 Introduction 8 Who is Tri-State? 8 Project description (21-3-330.C.1.a-e) 8 Purpose and need (21-3-330.C.1.f-g) 8 1041 Application Submittal Requirements (21-3-330) 9 Landowners within 1320 feet (21-3-330.B.2.a) 9 Planned access to the site (21-3-330.B.2.b) 10 Real property interests (21-3-330.B.2.c) 10 Mineral interest holders (21-3-330.B.2.d) 10 Owners of traversing infrastructure 10 Vicinity map (21-3-330.B.3.d) 11 Plot plan (21-3-330.6.4) 11 Present use and zoning (21-3-330.B.5.a) 11 Major facilities of a public utility within five miles (21-3-330.B.5.b-d) 11 Applicants (21-3-330.B.5.h) 11 Fee owners of the property (21-3-330.B.5.i) 12 Legal description of the property (21-3-330.B.5.j) 12 Total acreage of the parcel (21-3-330.B.5.k) 12 Existing land use (21-3-330.6.5.1) 12 Adjacent land uses (21-3-330.6.5.m) 12 Present zone and overlay zones (21-3-330.B.5.n) 12 Signatures of applicant and fee owners (21-3-330.B.5.o) 12 Decommissioning plan (21-3-330.6.17) 13 Facility Emergency Action Plan 13 Information regarding other utility facilities (21-3-330.C.2.b) 13 Supplemental Questions for 1041 Major Facilities of Public Utilities 14 Type of facility (21-3-330.B.5.e) 14 Projected development schedule (21-3-330.6.5.f) 14 Future phases of development (21-3-330.B.5.f.ii) 14 2 Hazards and emergency procedures (21-3-330.B.5.g) 15 Fire safety and emergency procedures 15 Waste and hazardous materials 15 Electric and magnetic fields (EMF) 15 Major natural and socioeconomic environmental constraints as they affect the site selection and construction of the facility as proposed (21-3-330.6.6) ..16 Natural and socioeconomic impacts from construction of the substation (21-3-330.6.6) 17 Land use (21-3-330.C.2.a) 17 Transportation impacts (21-3-330.C.2.f) 18 Socioeconomic impacts 18 Water resources (21-3-330.C.2.c) 18 Significant environmentally sensitive factors (21-3-330.C.2.d) 19 Less damaging alternatives (21-3-330.C.2.g) 24 Long-term effects upon physical and socioeconomic development (21-3-330.6.8) 25 Minimization and mitigation of adverse impacts and maximization of positive impacts (21-3-330.6.9) 25 Nonstructural alternatives (21-3-330.10) 25 Structural alternatives (21-3-330.B.11) 25 Air and water pollution impacts and control alternatives (21-3-330.6.12) 26 Air pollution impact and control 26 Water pollution impacts and control 26 Design alternatives: access, landscaping, and architecture (21-3-330.6.5.13) 26 New or upgraded services (21-3-330.6.14) 26 Hydrologic, atmospheric, geologic, pedologic, biotic, visual, and noise impacts (21-3-330.6.15) 26 Hydrologic 27 Geologic 27 Pedologic 27 Visual (21-3-330.C.2.e) 28 Noise (21-3-330.C.2.e) 28 Surface and subsurface drainage analysis (21-3-330.6.16) 29 Electric and magnetic field (EMF) modeling and prudent avoidance (21-3-330.C.3) 29 Compliance with Use by Special Review 1041 Code Requirements 30 Design Standards (23-2-240) 30 Adequate water service (23-2-240.A.1) 30 Adequate sewer service (23-2-240.A.2) 30 3 Soil limitations (23-2-240.A.3) 30 Adequate fire protections (23-2-240.A.4) 30 Stormwater drainage requirements (23-2-240.A.5) 30 Parking and vehicle storage (23-2-240.A.6) ..31 Bulk standard requirements (23-2-240.A.7) 31 Safe access (23-2-240.A.8) 31 New public rights -of -way access (23-2-240.A.9) 31 Buffering or screening (23-2-240.A.10) 31 USR in the A -Zone District on prime soils (23-2-240.A.11) 31 Sign placement (23-2-240.A.12) 31 Trash collection areas or facilities (23-2-240.A.13) 32 Operation Standards (23-2-250) 32 Noise standards compliance (23-2-250.A) 32 Compliance with Colorado Air Quality Control Commission regulations (23-2-250.B) 32 Compliance with Colorado Water Quality Control Commission regulations (23-2-250.C) 32 Lighting standards compliance (23-2-250.D) 32 Heat emission limitations (23-2-250.E) 32 Property maintenance (23-2-250.F) 32 Off -site and on -site Improvements Agreement (23-2-250.G) 32 Use by Special Review Questionnaire 33 Planning Questions (23-2-260) 33 Proposed use and need 33 Current and previous use of land 33 Use compatibility (also satisfies 23-2-220.A.3, 23-2-230.B.3) 33 Proximity to residential structures 33 Operations 33 The number of shifts to be worked and the maximum number of employees 34 The maximum number of users, patrons, members, buyers or other visitors that the use by special review facility is designed to accommodate at any one time 34 Types and maximum numbers of animals to be concentrated on the site at any one time 34 Types and numbers of operating and processing equipment to be utilized 34 Existing and proposed structures 34 Stockpile, storage, or waste areas and methods of disposal 35 Construction timetable 35 4 Proposed and existing lot surface type 35 Parking 35 Fencing, screening, and landscaping 35 Reclamation 36 Fire protection 36 Alignment with the Weld County Comprehensive Plan (23-2-220.A.1, 23-2-230.B.1) 36 Intent of the Agricultural Zone District (23-2-220.A.2, 23-2-230.B.2) 37 Compatibility with future development (23-2-220.A.4, 23-2-230.B.4) 37 Compliance with Overlay Zoning District or a Special Flood Hazard Area (23-2-220.A.5, 23-2- 230.B.5) 37 Conservation of prime agricultural land (23-2-220.A.6, 23-2-230.B.6) 37 Protection of public health, safety and welfare (23-2-220.A.7, 23-2-230.B.7) 38 Irrigation features 39 Compliance with the standards of any Overlay Zoning District 39 State and federal permits 39 Environmental Health Questions 39 Drinking water source 39 Sewage disposal system 39 Storage and warehousing 39 Storage of wastes, chemicals, and/or petroleum 39 Fuel storage 40 Vehicle and equipment washing 40 Floor drains and fluid containment 40 Air emissions 40 Design and operations plan 40 Nuisance management plan 40 Development Review Questions (8-4-10) 40 Access location and applicable use types 40 Anticipated changes to existing access 40 Existing or proposed access gate 41 Existing accesses on adjacent and opposite parcels 41 Difficulties to traffic visibility 41 Horizontal curves 41 Topography of the road 41 5 Engineering Questions 41 Preliminary traffic narrative 41 MS4 requirements 42 Building Questions 42 Existing and proposed structures 42 Existing structures use for this USR 43 Proposed use(s) of each structure 43 Figures 44 Figure 1: Vicinity Map 45 Figure 2: Plot Plan 47 Figure 5: Water Resources Map 49 Figure 6: Land Cover Map 51 References 53 6 List of Acronyms and Abbreviations Acronym,/Abbreviation Definition APLIC Avian Power Line Interaction Committee APP Avian Protection Plan BCC USFWS Birds of Conservation Concern CRS Colorado Revised Statutes CPW Colorado Parks and Wildlife EEE Electric Equipment Enclosure EMF Electric and Magnetic Fields MW Megawatts mG Milligauss N ESC National Electrical Safety Code P FD Public Facility Division P UC Public Utilities Commission PVREA Poudre Valley Rural Electric Association ROW Right -of -Way SC CPW Species of Special Concern S IS System Impact Study Tri-State Tri-State Generation and Transmission Association, Inc. U SFWS U.S. Fish and Wildlife Service WAPA Western Area Power Administration 7 Project Overview Introduction This document is being submitted by Tri-State Generation and Transmission Association Inc. (Tri-State) to request approval of the proposed Iron Mountain Delivery Point Project (Project) under the provisions of Chapter 21 of the Weld County Code for Areas and Activities of State Interest and Article III for Site Selection and Construction of Major Facilities of a Public Utility. Tri-State operates as a public utility under Colorado Revised Statutes (CRS) 40-1-103. This submittal includes the purpose and need and description of the proposed Project, which is situated on privately owned property in Weld County. Who is Tri-State? Tri-State is a wholesale electric power supplier for 41 utilities in the rural west. Tri-State generates and transports electricity to its member systems throughout a 200,000 -square -mile service territory across Colorado, Nebraska, New Mexico, and Wyoming. Tri-State was founded in 1952 and today supplies power for approximately 1.4 million consumers in the four states. Tri-State serves its member systems through a combination of owned base load, intermediate, and peaking power plants that use coal and natural gas as their primary fuels, supplemented by purchased power, federal hydroelectricity allocations, and renewable energy. Project description (21-3-330.C.1.a-e) Tri-State is proposing to construct a new 115/12.47 -kV substation in Weld County, south of Windsor, called the Iron Mountain Substation. The substation is being proposed to establish a new delivery point for its Member System, Poudre Valley Rural Electric Association (PVREA). Tri-State is the wholesale provider of electrical energy to PVREA, who provides retail electrical service to their customers in northern Colorado. PVREA requested a new delivery point substation from Tri-State to serve approximately 25 megawatts (MW) of load growth, which is beyond PVREA's current capability. The proposed substation will serve new residential development (2000+ homes), apartment complexes, schools, and commercial loads between Windsor and Loveland. The Iron Mountain Substation will be built on a property in the northeast quarter of Section 7, Township 5 North, Range 67 West (parcel no. 095707100001). Tri-State holds an option to purchase approximately 6 acres from the owner of the property and is currently working with Weld County to permit a Public Facility Division (PFD) of the original parcel. Upon approval of the PFD and 1041/USR permits, Tri-State will purchase the subdivided 6 -acre parcel for the Project. Purpose and need (21-3-330.C.1.f-g) Tri-State is the wholesale provider of electrical energy to its Member System, PVREA, who currently serves the area east of I-25 and south of Highway 402 from long circuits that originate primarily from the north or west. Historically, electric loads in this area have been limited to small farms and residences, which could be accommodated with existing facilities. However, recent increased loads from single residences and subdivisions, large agricultural loads such as dairy farms, and commercial development can no longer be served from these long distances. The purpose of the new delivery point is to allow transfer of existing load from existing Windsor (6.2 MW) and Airport (4 MW) Substations, accommodate additional load and enhance reliability under contingency (outage affecting existing facilities). The new source will consist of a new 115/12.47 -kV point of delivery substation that will be adjacent and connect to Western Area Power Administration's (WAPA) Airport -Whitney 115 -kV transmission line. 8 1041 Application Submittal Requirements (21-3-330) Landowners within 1320 feet (21-3-330.B.2.a) Table 1 lists the names and addresses of all surface property owners within 1,320 feet of the PFD parcel. Table 1: Landowners within 1320 Feet Owner Name Parcel ID Address / Mailing Address Weld County 095705300004 1150 O St, Greeley, CO Michelle R Scallon 095705300005 29108 County Road 15, Weld County, CO Ryan D Scallon Trollco, Inc. 095705300006 1625 Pelican Lake Point Suite 201, Windsor, CO Marcia Tellinghuisen 095706000029 6511 County Road 60, Weld County, CO Frank Thomas Living Trust 095706400001 6863 County Road 60, Weld County, CO Frank Sherri Living Trust Joseph A Shumacher Trust No 1 095706400001 6863 County Road 60, Weld County, CO Nancy Shumacher Trust No 1 Theodore H Lind Living Trust 095706400003 29241 County Road 15, Weld County, CO Ted Lind Viki Lind 095706300045 29486 County Road 15, Windsor, CO Martin Lind Theodore H Lind Living Trust 095706400004 29241 County Road 15, Windsor, CO International Agents Incorporated 095707000041 28311 County Road 15, Windsor, CO International Agents Incorporated 095707000042 28311 County Road 15, Windsor, CO Vima Partners, LLC 095707200044 1625 Pelican Lake Point Suite 201, Windsor, CO Zeiler Farms, Inc. 095707300002 5901 Sacajawea Way, Loveland, CO Zeiler Farms, Inc. 095708000040 28276 County Road 15, Windsor, CO Zeiler Farms, Inc. 095708000041 28204 County Road 15, Windsor, CO Pamela K Overmiller Living Trust 095708200048 28730 County Road 15, Weld County, CO Jennifer St James 095708200050 7066 County Road 60, Weld County, CO Debora J Robbins 095708200051* 28942 County Road 15, Weld County, CO Denise C Staley 095708202001 7254 Willow Ridge Dr, Weld County, CO Jeremy T Staley Debora J Robbins 28530 County Road 15, Weld County, CO Thomas L Frank 095708200049` Cynthia A Roorda Pamela K Overmiller * Parcel is within 500 feet. Note: Where a property address was unavailable, mailing address from Weld County Assessor records was used. 9 Planned access to the site (21-3-330.B.2.b) An access road will be created off County Road 15. Tri-State will coordinate access road permitting with the County and will comply with all County design standards. Real property interests (21-3-330.B.2.c) Vima Partners LLC is the only surface property owner or interest holder that will be physically disturbed or crossed by the Project. Table 2 lists their information. Tri-State holds an option to purchase the approximate 6 -acre parcel needed for the Project. Table 2: Real Property Interests Physically Disturbed by Project Owner Name Parcel ID Mailing Address Vima Partners LLC 095707100001 1625 Pelican Lake Point Suite 201, Windsor, CO Mineral interest holders (21-3-330.B.2.d) Tri-State has identified mineral owners on the property and intends to comply with CRS Section 24-65.51-103. The application includes a Mineral Ownership Report, detailing the information of mineral interest holders with an interest in any real property proposed to be physically disturbed by the development. There is not currently a Surface Use Agreement on the property. Owners of traversing infrastructure Tri-State has identified traversing infrastructure on or around the property to include the following: - A pipeline easement running east to west on the northern edge of the property, owned by Kerr-McGee Gathering. - A pipeline easement bisecting the property north to south, granted to Sinclair. - An existing 115 -kV WAPA transmission line easement running east -west on the southern edge of the property. - An irrigation ditch easement running diagonally northwest to southwest across the property, owned by Big Cut Lateral and Reservoir Company. - A pipeline easement running parallel with County Road 15 on the eastern edge of the property, owned by Kerr-McGee Gathering. Of those listed above, only the 25 -foot -wide pipeline easement owned by Kerr-McGee Gathering on the eastern edge of the property intersects the Project parcel. The names and addresses of the owners/operators of traversing infrastructure are listed in Table 3; the pipeline that traverses the Project parcel is in bold. 10 Table 3: Owners/Operators of Traversing Infrastructure Owner Name Infrastructure Mailing Address Kerr McGee Gathering* Pipeline (N -S) 9950 The Woodloch Woodlands, Forest TX 77380 Drive, Suite 2800, Kerr McGee Gathering* Pipeline (E -W) 9950 The Woodloch Woodlands, Forest TX 77380 Drive, Suite 2800, Sinclair Pipeline P.O. Box 30825, Salt Lake City, UT 84130 WAPA Transmission Line P.O. 8213 Box 281213, Lakewood, CO 80228- Big Cut Lateral and Reservoir Company Ditch 29470 Weld 80550 County Rd 15, Windsor, CO *Also known as Western Midstream. Vicinity map (21-3-330.B.3.d) The vicinity map is attached as Figure 1. Plot plan (21-3-330.B.4) The plot plan is attached as Figure 2. Present use and zoning (21-3-330.B.5.a) The Project is located in unincorporated Weld County and is Zoned Agricultural. Land use in the area immediately surrounding the Project includes agricultural production, large lot residential, electric transmission and oil/gas production. Railroad and industrial uses exist in the larger surrounding area. Major land cover types near the Project parcel are shown in Figure 6. Major facilities of a public utility within five miles (21-3-330.B.5.b-d) A map of major facilities of a public utility within five miles of the Project is included with the application as Figure 3. Applicants (21-3-330.B.5.h) Tri-State Generation and Transmission, Inc. 1100 West 116th Ave., Westminster, CO 80234 Preparers: Selina Koler Isabella Beshouri C: 303-229-3207 C: 720-648-3678 11 Fee owners of the property (21-3-330.B.5.i) The current fee owner is Vima Partners, LLC located at 1625 Pelican Lake Point Suite 201, Windsor, CO, 80550. Concurrently with this application, Tri-State is also filing for a PFD to subdivide 6 acres from the original parcel on which to construct and operate the Iron Mountain Substation. Tri-State holds an option to purchase the 6 -acre site and will acquire the property upon approval of the PFD and other permitting. Legal description of the property (21-3-330.B.5.j) A parcel of land situated in the NE1/4 Section 7, Township 5 North, Range 67 West, 6th Principal Meridian, County of Weld, State of Colorado being more particularly described as: Beginning at a point on the East line of said Section 7, from which the Northeast corner of said Section 7 bears N02°31'48"E 838.33 feet; Thence S02°31'48"W 480.00 feet; Thence S89°40'08"W 542.00 feet; Thence N02°31'48"E 480.00 feet; Thence N89°40'08"E 542.00 feet to the Point of Beginning. Containing 5.97 Acres more or less as described. Total acreage of the parcel (21-3-330.B.5.k) The Project will be constructed on a 6 -acre parcel, including a 2 -acre fenced substation facility footprint. The remaining parcel acreage will be used for the detention pond and for the transmission structures to connect to the existing line. Existing land use (21-3-330.B.5.1) The Project will take place on private land, which is currently used for agricultural activity. Adjacent land uses (21-3-330.B.5.m) Land use in the area immediately surrounding the Project includes agricultural production, large lot residential, electric transmission and oil/gas production. Railroad and industrial uses exist in the larger surrounding area. Present zone and overlay zones (21-3-330.B.5.n) The land is currently zoned Agricultural. There are no overlay zones for this parcel. Signatures of applicant and fee owners (21-3-330.B.5.o) The signed application form is included with the application submittal. 12 Decommissioning plan (21-3-330.B.17) Substations are built to be operated indefinitely as they are an integral part of the regional electrical system. Though facilities of electric utilities are rarely, if ever, decommissioned, Tri-State would work together with the County to develop a decommissioning plan that ensures that the area is restored, stabilized, revegetated, and monitored should the Project be taken out of service. In the unlikely event of a dissolution of Tri-State, the ownership and maintenance of the facility would likely be passed to another utility such as PVREA. Facility Emergency Action Plan Tri-State has created a Facility Emergency Action Plan for the Iron Mountain Substation; it is included with the application. Information regarding other utility facilities (21-3-330.C.2.b) A map showing each existing major facility of a public utility within the County is included with the application as Figure 4. 13 Supplemental Questions for 1041 Major Facilities of Public Utilities Type of facility (21-3-330.B.5.e) Tri-State is proposing to construct a new 115/12.47 -kV substation in Weld County, south of Windsor. The substation is being proposed to establish a new delivery point for customers of PVREA in northern Colorado. As described in the Project description, PVREA requested a new delivery point substation from Tri-State to serve approximately 25 MW of load growth, which exceeds the capacity of existing facilities. The new substation will serve the new residential development (2000+ homes), apartment complexes, schools, and commercial loads between Windsor and Loveland. The proposed substation will provide a new location from which distribution service can be provided and will connect to an existing transmission line. Facilities included as part of the Project will be limited to the substation, two three - pole transmission structures, and an access driveway, as well as a temporary mobile substation to bridge service needs and supply chain horizons. The two transmission line structures will connect to the existing WAPA transmission line to the south. The Project area will be approximately 6 acres, including a 2 -acre fenced substation facility footprint. The mobile substation will be installed inside the 2 -acre fenced footprint. There is a chance that the temporary mobile substation would have to be installed outside of the fence in the event that the control building delivery is delayed, but this is unlikely. Projected development schedule (21 -3-330.B.5.f) During construction, one 10 -hour shift will be worked per day with a maximum of approximately 10 workers and an average of 6-7 workers present at any time. The site will be monitored remotely during operation with infrequent trips to the substation for inspections and occasionally for maintenance. The proposed schedule is shown in Table 4. Table 4: Proposed Project Schedule Milestone Date Weld County Permit Granted July 2025 Construction Begins December 2025 Mobile Substation Install March 2026 Transformer Delivery October 2026 Substation In -Service Date November 2026 Future phases of development (21-3-330.8.5.O0 The site design maintains flexibility for future phases of development, including the potential to add a transformer. The space for such an iteration is incorporated into the property, so a future transformer would not require expansion of the yard. 14 Hazards and emergency procedures (21-3-330.B.5.g) Fire safety and emergency procedures All Tri-State electric facilities are designed, constructed, operated, and maintained to meet or exceed all applicable standards of design and performance set forth in the National Electrical Safety Code (NESC, 2012). Tri-State prohibits the storage of flammable materials, the construction of flammable structures, and other activities that have the potential to cause or provide fuel for fires on its property. There are no explosive substances associated with the proposed substation. Post -construction, the proposed substation will be unmanned and controlled remotely by Tri- State. The substation will be designed with overhead ground wires and grounded towers to protect the system from becoming damaged by lightning. The facility will be fenced and locked to prevent public access. The Project is located within District 1 of the Weld County Sheriff's Department and is within the jurisdiction of the Windsor Severance Fire Protection District. All applicable fire laws and regulations, as outlined in CRS 31-16-601, will be observed during the construction period. Tri-State will advise construction personnel of their responsibilities under the applicable fire laws and regulations, including taking practical measures to report and suppress fires. The Iron Mountain Facility Emergency Action Plan is included with the application. Waste and hazardous materials Enclosed containment will be provided for all trash. All construction waste, including trash and litter, garbage, other solid waste, petroleum products, and other potentially hazardous materials, will be removed from the site and transported to a disposal facility authorized to accept such materials. There will be no significant amount of hazardous materials stored in the Project area. Construction, operation, and maintenance activities will comply with all applicable federal, state, and local laws and regulations regarding the use of hazardous substances. The only hazardous chemicals expected to be used on site are those found in diesel fuel, gasoline, coolant (ethylene glycol), and lubricants in machinery. Hazardous materials will not be drained onto the ground or into streams or drainage areas. In its contract with the construction contractor, Tri-State will specify that it will hold a required pre -construction meeting with the contractor to ensure all applicable laws and Tri-State's procedures are followed. Tri-State's Environmental Protection Measures for Construction Projects are enclosed with the application. Electric and magnetic fields (EMF) Electric fields are caused by voltage on an object, such as the voltage on conductors connected to an energized substation. Magnetic fields are produced when an electrical current flows through a conductor. EMF extends outward from transmission line conductors and decreases rapidly with distance from the transmission line or substation. Prudent avoidance incorporates efforts to strike a reasonable balance between the potential health effects of exposure to EMF and the cost and impacts of mitigating such exposure, by taking steps to reduce the exposure at a reasonable or modest cost. This concept, as outlined by the Colorado Public Utilities Commission (PUC), was considered in the siting, proposed construction, and operation of this facility. This Project's approach to prudent avoidance along with the results of EMF modeling and analysis are described in more detail in Electric and 15 magnetic field (EMF) modeling and prudent avoidance (21-3-330.C.3.b). The EMF and Audible Noise Study is included with the application. Numerous scientific studies have been conducted to better understand whether there is a possibility that EMF causes disease. The consensus of scientists familiar with these studies is that no significant risk to humans from long-term exposure to EMF has been established. Tri-State remains sensitive to the EMF issue and responds promptly to inquiries with currently available information. As corporate policy, Tri-State has adopted programs to ensure that its electric facilities are designed, constructed, and operated to minimize, to the extent prudent and practicable, the level of EMF that is created. Tri-State's position statement on EMF health effects is enclosed with the application. Major natural and socioeconomic environmental constraints as they affect the site selection and construction of the facility as proposed (21-3-330.B.6) Tri-State performed a System Impact Study (SIS) in June 2023 to evaluate the impacts of and alternatives to the addition of a new 115/12.47 -kV delivery point substation. To align with the Project's goal to meet growing demand and improve reliability, the scope of siting alternatives for the new substation was limited to areas sectionalizing the Whitney -Windsor -Airport transmission line. The possibility of expanding existing substations in Windsor and Loveland was evaluated but dismissed due to the cost and extent of required improvements and site constraints such as existing pipelines and topology. Evaluation of alternatives is discussed in more detail in Less damaging alternatives (21-3-330.C.2.g). Ultimately, the construction of a new substation, called Iron Mountain, two miles east of the existing Airport Substation emerged as the option with the best combination of long-term reliability and cost-effectiveness. Two sites in the vicinity as well as the entire pre -subdivision parcel were evaluated as potential alternatives. One of the alternative sites would have required underground boring of PVREA distribution lines to avoid the existing canal, while the other was removed from consideration based on discussions with the landowners. The size of the facility is standard for a substation of this capacity and fits within the associated setback requirements. General routing objectives are provided in Table 5 below, but primarily include the following considerations: - Agricultural uses (e.g., center pivots, crops) - Land ownership (e.g., Federal) - Length of transmission and distribution lines required - Number of residences in proximity - Engineering factors (e.g., transmission line crossings and angles) - Property lines - Proximity to wells and other oil and gas facilities Based on this alternatives analysis, the currently proposed site was selected. Impacts to agricultural lands will be minimized by siting the facility next to a public road and avoiding an access road. Transmission infrastructure is already prevalent in the area and placement of the proposed substation and transmission line structures will not preclude the use of farmland on adjacent parcels. 16 Table 5: General Routing Objectives Land Use Objectives Avoid oil and gas flare and vent facilities by 75 feet for height clearance. Avoid gas and water wells by 200 feet. Parallel existing transmission lines where possible, while maintaining appropriate clearance. Minimize the number of transmission line crossings. Favor transmission and high future -density routing land transmission lines, land such uses that use. line as are industrial, through less compatible, areas commercial, with such existing and as and agricultural residential future land grazing. developments, uses Minimize that agricultural are areas compatible with crops, existing with and Where transmission they exist and are not constrained by crowding, lines). parallel existing linear corridors (roads and Minimize proximity to occupied structures and other buildings. Minimize that the ROW proximity is kept to homes clear of and existing buildings, structures. and other industrial structures such as oil and gas wells, so Minimize impacts to agriculture/crop lands. Transportation Objectives Favor paralleling existing state highways and county and local roads where possible. Land Cover Objectives land Transmission features, line such spans as ditches are approximately that are greater 700 than feet 1000 to 1000 feet feet; in therefore, width that avoid cannot surface be spanned. water or other Minimize wetlands impacts or through to sensitive careful pole resources placement. that exist in wetlands by spanning wetlands or routing around Existing Utility Infrastructure Objectives Assess the feasibility of routing along existing transmission and distribution lines and existing pipelines. Cultural and Historic Resources Objectives Avoid away from potential such degradation sites. of National Register of Historic Places -listed sites by routing transmission lines Avoid routing transmission line within identified sites Biological Resources Objectives Reduce potential impacts to sensitive species habitat. Minimize impacts to avian species by avoiding nesting areas. Natural and socioeconomic impacts from construction of the substation (21-3-330.B.6) Land use (29-3-330.C.2.a) The proposed substation will be located in an area that is zoned agricultural. Although the substation is not an agricultural use, it is a land use commonly located in agricultural areas, supports many agricultural operations, and aligns with the goals outlined in the Weld County Comprehensive Plan, as discussed in the following sections. The parcel purchased for the substation will be permanently removed from historical agricultural use but will not significantly disrupt the area's overall productivity. The agricultural productivity capability of soils on the Project site are shown in Figure 1. A soils report prepared by the Natural Resources Conservation Service (NRCS) is included with the application. The Project footprint was situated adjacent to linear facilities and land use features, to the extent 17 practicable, including roads, the existing transmission line, and field edges. Land uses surrounding the substation will be minimally impacted and will continue to prioritize agriculture. As further described in Socioeconomic Impacts below, the Project will not significantly affect or depreciate the surrounding area's agricultural productivity. Transportation impacts (21-3-330.C.2.f) A daily average of 6-7 construction workers will be employed during the approximately 11 -month construction period. The maximum number of construction workers at any one time will be approximately 10. The site will be monitored remotely during operation, with infrequent trips to the substation for inspections and occasional trips for maintenance. No adverse effects on county roads are anticipated. All mobile construction equipment will be certified to operate on interstate highways. There may be short periods of time when traffic will be halted on county roads to allow construction vehicles to enter and exit the construction area. No improvements to Weld County roads will be required. Socioeconomic impacts Windsor and Loveland are the communities nearest to the Project area. It is anticipated that the Project will have a small beneficial impact to their local economies. Construction contractors, regardless of origin, would likely spend some money in these communities for fuel, food, or other supplies. During the construction period, the local economy may see a small influx of dollars and a small increase in sales tax revenue. The footprint of the 6 -acre substation site will be the only land removed from current use. Land surrounding the substation and transmission structures would remain available for farming, grazing, or other operations that do not interfere with safe and reliable operation of the transmission line. The Project area is located within District 1 of the Weld County Sheriffs Department and is within the jurisdiction of the Windsor Severance Fire Protection District. Public roads are maintained by the Weld County Department of Public Works. The nearest hospital is the UC Health Medical Center of the Rockies located at I-25 and US 34. None of these services is expected to be affected unless emergency situations occur. There are no adverse socioeconomic impacts associated with the Project. The Project will not cause any residents or businesses to be displaced. The Project will generate additional tax revenue for Weld County. This aligns with the Economic Development Goals and Policies described in the Weld County Comprehensive Plan. Water resources (21-3-330.C.2.c) According to data from the Weld County Property Portal, the Project site is not situated within the boundaries of a 100 -year or 500 -year floodplain. It is situated in an Area of Minimal Flood Hazard (FEMA, 2023), in which there are no potential, adverse impacts anticipated. Figure 5 presents a map of water resources within two miles of the Project site. 18 Significant environmentally sensitive factors (21-3-330. C.2.d) Marshlands and wetlands The vegetation community in the vicinity of the substation can be characterized as agricultural fields. Permanent removal of vegetation will occur within the 6 acres proposed for the substation. Construction will occur primarily in an area that has been previously disturbed by agriculture and impacts to native vegetation communities are expected to be minimal. No drainages or wetlands occur at the substation site. Groundwater recharge areas The Project will not impact the flow of groundwater, nor will it affect groundwater recharge. Potential natural hazards The substation will be designed with overhead ground wires and grounded towers to protect the system from becoming damaged by lightning. The Project is not within a Geologic Hazard area. Forests and woodlands The Project will not impact forests and woodlands. Wildlife and critical wildlife habitat The Project is located in an ecoregion characterized by flat to rolling plains with shortgrass prairie (Chapman et al. 2006). The substation site is in a highly disturbed agricultural field, which reduces the ability for native plants typically found in the Flat to Rolling Hills level IV ecoregion to occur. The area surrounding the substation is likely to support a variety of common wildlife such as coyote, skunk, rabbits, and various birds, including raptors. The region also supports habitat for various state listed species, discussed in detail below. There is no federally designated critical wildlife habitat in the vicinity of the Project. Tri-State conducted a biological resources assessment on the Project site. The desktop review and field survey identified and mapped the following potential environmental constraints: - Threatened and endangered species and associated critical habitats within the Project area. - State sensitive and listed species and associated potential habitat within the Project area and direct vicinity. - Raptor nests, including eagles, within 0.5 mile of the Project. - Suitable burrowing owl habitat within 0.25 mile of the Project. - Wetlands and other waters of the U.S. within the Project area. Tri-State conducted field surveys of the substation property for migratory birds. Due to the Project area's small size and current agricultural production on the property, there is very limited nesting habitat for most migratory birds. General wildlife observations within the Project area were typical for agricultural areas in Weld County. The following species were identified during the field visit: Swainson's hawk (Buteo swainsoni), mourning dove 19 (Zenaida macroura), red-tailed hawk (Buteo jamaicensis), common pigeon (Columba livia), red -winged blackbird (Agelaius phoeniceus), and American kestrel (Falco sparverius). Although nesting substrate for raptors was observed within the field survey area, no raptors were observed within l/2 mile of the substation site. No suitable burrowing owl habitat was observed within �/4 mile of the site. Project impacts to wildlife are expected to be minimal and limited to temporary disturbance from construction activities. To preclude avian electrocutions and minimize collision risk, Tri-State will incorporate Avian Protection Plan (APP) recommendations developed by the Avian Power Line Interaction Committee (APLIC, 2006) and the APP guidelines (APLIC and USFWS 2005) to protect birds at the substation. Furthermore, impacts can be largely avoided or mitigated by surveys and/or seasonal construction restrictions. Special status species The USFWS IPaC online tool and Colorado Natural Heritage Program CODEX online tool were used to identify federal and state listed species and other special status species (e.g., species protected by the Bald and Gold Eagle Protection Act) that may occur within or near the Project area. The results of this desktop analysis are shown in Table 6). No USFWS-designated critical habitat is present within the Project area. The federal and state listed species, as well as CPW species of Special Concern (SC) and USFWS Birds of Conservation Concern (BCC) that have a likelihood of occurrence within the Project area are discussed further in the sections below. CPW SC and USFWS BCC species are not statutory designations. Every bird species in Table 6 is protected under the Migratory Bird Treaty Act. Table 6: Special Status Species with a Likelihood of Occurrence Within the Project Common Name Scientific Name Status Habitat Associations Likelihood of Occurrence Mammals Black prairie -tailed dog Cynomys ludovicianus SC Burrows sloping sparse in dry, grasslands vegetation. flat, or with gently low, Unlikely — The suitable Project habitat. area does not contain jumping Preble's meadow mouse Zapus hudsonius preblei FT, ST immediately Heavily dominated habitats of Colorado. the Front vegetated, along riparian adjacent Range the eastern shrub- habitats of upland and edge Unlikely — habitat. Project area lacks riparian Birds Bald eagle Haliaeetus leucocephalus BGEPA, SC, BCC Cottonwood and other large deciduous forest galleries near large bodies of water. Project is located within species' winter range and is located near Unlikely — Breeding. Eagle nests are not known within the Project area. The closest recorded nests are 2.5 and 2.6 miles to 20 Common Name Scientific Name Status Habitat Associations Likelihood of Occurrence historic areas. bald eagle habitat southwest of Unlikely the Project — Project and Foraging. active area. habitat 3 bald miles area, Although eagle present there northeast nests for is there near not prey suitable are the species. Burrowing owl Athene cunicularia ST Prairie areas known squirrels area breeding with occurs dog to colonies short use and and badgers. within burrows overall grass. the in of species' range. open Project Also ground Unlikely — The this prairie suitable Project species. dog area burrows, nesting does not which habitat contain provide for Eastern black rail Laterallus jamaicensis spp. jamaicensis FT impounded Marshes across riparian prairies, North and marshes, saltmarshes, wetlands. wet America, meadows including coastal and Unlikely — habitat. Project area lacks wetland Ferruginous hawk Buteo regalis SC, BCC Flat grassland regions. forest canyons. and interior, rolling or Avoids shrub and terrain -steppe high elevation, narrow in Unlikely — area habitat. Breeding contains marginal Low — Foraging Project hunting Golden eagle Aquila chrysaetos BGEPA, BCC Partly grassland nest on open vegetation. steep country cliff with faces. native Prefers to Unlikely of Project the Breeding Foraging species' nesting Project lack range, area of or area or is available habitat foraging lies unlikely the for — — the substrate Unlikely likelihood Although within within based nesting prey species. this the on Long curlew -billed Numenius americanus SC, BCC Dry meadows, with water. prairies short and usually grass grassy in a near a flat body area of Unlikely — The suitable Project habitat. area does not provide 21 Common Name Scientific Name Status Habitat Associations Likelihood of Occurrence Mountain plover Charadrius montanus SC High and birds nesting desert plains are commonly near tablelands. shortgrass prairie found dog prairie These towns. Unlikely — The shortgrass Project area does prairie not habitat. contain Piping plover Charadrius melodus FT, ST lakes, Sandy where present, shores beaches, scattered and and ponds, islands sparsely and especially grass rivers. of tufts vegetated shallow are Unlikely- The suitable Project area habitat. does not provide Whooping crane Grus americana FE, SE Estuarine bays, wetlands. emergent marshes, shallow herbaceous Unlikely — involves Only within could to species downstream the considered water cause is Platte -related known a waters if River the to Project activities Basin depletion where occur. that the Fish Iowa darter Etheostoma exile SC Clear, headwaters, to slow medium vegetated creeks, rivers. and perennial small Unlikely — There are within no the perennial streams Project located area. Pallid sturgeon Scaphirhynchus albus FE in Main (Missouri River, over channels lower area sandy with River, swift substrate. Platte of Mississippi flowing large rivers River), often water Unlikely — Project Platte known -related a waters depletion River to does activities where occur. Basin not to the that involve within could downstream species cause water the is Reptiles Common garter snake Thamnophis sirtalis SC Marshes, wet meadows, margins of ponds, woodlands, and cultivated fields. The Project area occurs in the overall range for the species. Moderate — This species may occur on the margins of the cultivated field present near the Project area. Insects Monarch butterfly Danaus plexippus FC Open fields and meadows with milkweed. Several milkweed species occur in Colorado, primarily in grasslands, disturbed areas, wetlands, and Unlikely —Breeding habitat (milkweed) was not observed inside the Project area. 22 Common Name Scientific Name Status Habitat Associations Likelihood of Occurrence irrigation ditches. Adults feed on milkweed and other flowering plants. Plants Ute ladies' - tresses Spiranthes diluvialis FT Moist meadows associated with perennial stream terraces, floodplains, and oxbows at elevations ranging from 4,300 feet to 6,850 feet. Unlikely — No perennial streams or riparian areas occur within the Project area. Western prairie fringed orchid Plantathera praeclara FT In full sun on moist to wet calcareous (calcium -rich, or alkaline) tallgrass prairies and sedge meadows (many flooded for 1-2 weeks per year). Most often grows in relatively undisturbed grassland but can also be found in moderately disturbed sites such as roadside ditches. Unlikely — Project does not involve water -related activities within the Platte River Basin that could cause a depletion to downstream waters where the species is known to occur. BGEPA = Bald and Golden Eagle Protection Act; FT = Federally Listed Threatened; FC = Candidate for Federal Listing (not a statutory category); ST = State Threatened; SE = State Endangered; SC= State Species of Special Concern (not a statutory category); BCC = USFWS Bird of Conservation Concern (not a statutory category) Sources: CPW 2024, USFWS 2024 Based on a desktop analysis of land cover data, aerial imagery, range maps, and observations during the field survey, one special status species (common garter snake) has a moderate likelihood of occurrence within the Project area. Although the Project area does not provide abundant habitat, common garter snakes may travel through the Project area to look for more suitable habitat. Common garter snakes were not observed during the field survey. Ferruginous hawks have a low likelihood to occur in the Project area, as it does not contain suitable nesting substrate. The Project area contains very limited foraging habitat, as it has previously been used annually to grow corn. Ferruginous hawks were not observed during the field survey. All other special status species listed in Table 6 are unlikely to occur in the Project area due to the absence of suitable habitat. Public outdoor recreation areas The Project is not near and thus will not affect any public outdoor recreation areas. 23 Unique areas of geologic, historic, or archaeological importance Tri-State conducted a Class III pedestrian survey of the Project area where infrastructure is planned. No sites eligible for listing on the National Register of Historic Places or isolated archaeological finds were found on the substation property. There are no areas of geologic importance in the vicinity of the Project. Vested water rights The Project will have no impacts on vested water rights. Construction water and water to suppress dust during construction activities will be trucked into the site. Less damaging alternatives (21-3-330.C.2.g) As mentioned previously, Tri-State performed an SIS in June 2023 to evaluate the impacts of the Iron Mountain Substation. The SIS determined that the new substation would not cause notable impacts to the area transmission system. The SIS identified three alternatives: 1. Expand the Airport Substation to add a second 115/12.47 -kV, 30 MVA transformer. 2. Construct a new substation to interconnect the Airport — Windsor Tap — Whitney 115kV line, located about two miles east of the Airport Substation. 3. Provide an energy storage system on the distribution system between the Airport and Windsor Substations. Evaluation of the three alternatives yielded the following results: Alternative 1 Expansion at the Airport Substation (Airport) was originally considered to increase capacity for the PVREA service area between Loveland and Windsor. Tri-State initiated a request to Platte River Power Authority (PRPA) concerning the addition of a second transformer for PVREA at Airport Substation. PRPA's review of the request identified the need to substantially expand the Airport Substation from a six -breaker ring to a full breaker -and -a - half design consisting of twelve breakers, due to the number of line positions and existing transformers. The PRPA expansion design would require that the existing Tri-State-owned distribution transformer located at Airport would need to be removed to create space for the breaker expansion. A new satellite yard would then need to be constructed to the east of the existing Airport Substation for both the existing and newly proposed transformers. Initial investigation of the property adjacent to the Airport site indicated that the satellite yard would need to be located even farther to the east, to avoid existing pipeline facilities, or to the south. The landowner at Airport has plans to develop a subdivision on the parcel, which would further restrict the siting opportunities for and residential impacts of a substation expansion. Alternative 2 In consideration of the constraints of the proposed expansion at Airport, the construction of a new substation was evaluated as an alternative. In proposing this alternative, the SIS found that improvements were required to sectionalize the line. The location of the sectionalizing station was determined to be two miles east of Airport Substation due to physical constraints in the vicinity of Windsor Tap. This site, known as Iron Mountain, provided adequate space to construct a substation with the advantage of not impacting or relocating existing facilities. The site would also be capable of expansion if needed. Evaluation by PVREA for their distribution circuits indicated 24 that the Iron Mountain site was the most efficient and cost-effective option when compared to Airport, primarily due to the length of the distribution circuits and the long-term efficiency of associated losses. PVREA also concluded that the addition of a substation between Windsor and Airport would significantly improve reliability, as the Iron Mountain Substation, when fully completed, could provide support for both Airport and Windsor under planned and forced outages of primary facilities. Alternative 3 Energy storage was not considered a viable option. The cost to produce a large enough battery is prohibitive and charging the battery would strain the distribution system. Based on the findings of this evaluation, construction of a new substation (Alternative 2) is the preferred alternative. In proposing the new substation, improvements are required to sectionalize the line, which requires the sectionalizing station to be located 2 miles east of Airport Substation due to physical constraints in the vicinity of Windsor Tap. Long-term effects upon physical and socioeconomic development (21-3-330.B.8) The proposed Project will not have any adverse effects on physical or socioeconomic development of the area. Minimization and mitigation of adverse impacts and maximization of positive impacts (21-3-330.B.9) Because Weld County has a semi -arid climate, revegetation can be difficult. As a result, disturbances to land surrounding the substation that result from temporary construction staging will be minimized. All practical efforts will be made to re-establish native vegetation or continue agricultural practices in the disturbed area. Tri-State's Environmental Protection Measures for Construction Projects, enclosed with the application, address site reclamation of disturbed areas. Nonstructural alternatives (21-3-330.10) There are no non-structural alternatives that will accomplish the purpose and need for the Project. If the Project is not constructed, Tri-State and its members would be required to seek other locations, with potentially greater impacts, to construct adequate facilities to accomplish the Project goals. Structural alternatives (21-3-330.B.11) Two sites in the vicinity as well as the entire pre -subdivision parcel were evaluated as potential alternatives. One of the alternative sites would have required underground boring of PVREA distribution lines to avoid the existing canals, while the other was removed from consideration by discussions with the landowners. The combination of willing landowners together with the feasibility of tapping the WAPA transmission line ultimately determined the currently proposed site to be the best option. There are no alternative types of facilities that would accomplish the Project's purpose and need. 25 Air and water pollution impacts and control alternatives (21-3-330.B.12) Air pollution impact and control Construction will last approximately 11 months. Construction activities associated with the proposed substation will generate less than significant amounts of particulate matter from soil disturbances and diesel -powered equipment, and less than significant amounts of carbon monoxide and the precursor pollutants to ozone formation from tailpipe emissions. Any air pollutants generated would be widely dispersed across the Project area, short-term in duration, and minimized by the small scale of construction operations for the substation. Air pollutants will also be minimized through the implementation of dust suppression and proper vehicle maintenance. Therefore, Project construction is not expected to contribute negatively to the air quality status in the area. There will be no long-term air quality effects associated with the routine operation and maintenance of the substation. Once construction activities have been completed, but before vegetation has been re-established, some minor amount of additional dust could occur. The generation of dust will be monitored by Tri-State, and appropriate action would be taken to control the dust and ensure that potential wind erosion is minimized. Portions of Weld County, near the Front Range cities, are designated as "non -attainment" with the 8 -hour federal ozone standard. However, the Project is in an attainment area for all measured pollutants, including particulate matter smaller than 10 micrometers in diameter (PM10). No air emissions will result from operation of the substation. Water pollution impacts and control There will be no direct impacts to water quality associated with regular operation or maintenance of the substation. The Project will not create runoff in excess of historical levels and will not adversely affect drainage. Design alternatives: access, landscaping, and architecture (21-3-330.B.5.13) Access to the Project construction area will be provided by a driveway off County Road 15. The access road or the substation will not require landscape treatments. Based on discussions with nearby landowners, and the incompatibility of vegetative screening with the existing and proposed transmission and distribution lines, Tri-State is proposing to construct an 8 -foot architectural wall surrounding the substation. No other buffering or screening is proposed. The substation and transmission structures were proposed to be proximal to existing transmission infrastructure to be compatible with and minimize disruption to the landscape. New or upgraded services (21-3-330.B.14) New or upgraded services are not applicable to, and not required for, this Project. Hydrologic, atmospheric, geologic, pedologic, biotic, visual, and noise impacts (21-3- 330.B.15) Atmospheric and biotic impacts are described above. 26 Hydrologic Construction and maintenance of the substation will not measurably impact surface water or groundwater quality. Additionally, there will be no long-term impacts to surface water or groundwater hydrology as a result of construction or operation of the Project. The Project will not impact hydrologic flow of either surface water or groundwater, nor will it affect groundwater recharge. Minimal water will be used during Project construction. Water for construction purposes, including concrete foundations and dust control, will be brought in from off -site sources by a construction water provider. The source of the construction water would be from either a private well owned by the construction water company or from a municipality. No existing water rights will be impacted and there will be no long-term use of water. If water is needed for revegetation of the staging area, the construction water provider would supply the water. No water will be required for the operation of the substation. Geologic Construction and operation of the substation will not alter the geology of the Project area. The Project is not within a Geologic Hazard area. Pedologic Figure 1 shows the general classifications and distribution of soils over the parcel and Figure 2 shows that there are no moderate to severe soil limitations on site. Shrink/swell potential of a soil is based on the change in length of an unconfined clod as moisture content is decreased from a moist to a dry state. The classes of shrink/swell potential are shown in Table 7. The soils (Wiley -Colby Complex, 1 to 3 percent slopes) in the study area have moderate shrink/swell potential. Table 7: Soil Shrink/Swell Classes Class Value Low 0-3`)/0 Moderate 3-6% High 6-9% Very high > 9% The factor K is a measurement of the soil's susceptibility to sheet and rill erosion by water; it is calculated as a function of an average diameter of the soil particles. Factor K is one of six factors used in the Revised Universal Soil Loss Equation to predict annual rate of soil loss in tons per acre per year. Factor K values range from 0.02 to 0.69, with higher values indicating higher losses. For this report, soil K factors will be classified based on Table 8. Table 8: Soil Erodibility Classes Class Factor K Value Low 0.05-0.2 Moderate 0.21-0.4 High > 0.4 27 According to the MRCS Soil Survey of the Southern Part of Weld County, the soils found at the substation are of the Wiley -Colby complex, which is highly erodible (0.43). Soils that are the most susceptible to wind erosion are in group 1 and those assigned to group 8 are the least susceptible. Soils at the substation site are in group 4L. There are no mines in the vicinity of the substation, which may increase the risk of soil subsidence, and the Project site is not within the Geologic Hazard overlay district. Nearly all the soils that would be disturbed at the Iron Mountain Substation are considered prime, only if irrigated. Construction of the Project will cause some localized soil compaction and increase the potential for soil erosion. Long-term effects associated with soil erosion and compaction will be minimized or negated though use of Environmental Protection Measures. An NRCS soils report is included with the application. Visual (21-3-330.C.2. e) The Project is not expected to significantly affect the aesthetics of the area. There is an existing 115 -kV WAPA transmission line to the south and two substations 2 miles to the west. A railroad track, US Highway 34, and various commercial and industrial developments are visible within one mile to the south and southeast. Noise (21-3-330. C.2. e) The Project will be constructed and maintained in accordance with CRS 25-12-101 et seq. (Noise Abatement) and Article IX, Section 14-9-40 et seq. of the Weld County Code. Noise levels for the substation were modeled and it was concluded that at 25 feet from the property boundary, noise levels will range between 26.0 to 30.4 dB(A). The maximum audible noise for the transmission line connection to the WAPA line was calculated to be 8.2 dB(A), with a value of 6.6 dB(A) at the edge of the right-of-way (ROW). Both estimates are significantly below the 50 dB(A) allowed in Residential areas under all operating conditions. No mitigation is proposed. The EM F and Audible Noise Study is included with the application. Table 9: Weld County and Colorado Revised Statutes Maximum Noise Levels Land Use Maximum Daytime Noise (dB(A))* Maximum Nighttime Noise (dB(A))* Weld County State of Colorado Weld County State of Colorado Residential 55 dB(A) 55 dB(A) 50 dB(A) 50 dB(A) Commercial 55 dB(A) 60 dB(A) 50 dB(A) 55 dB(A) Industrial 80 dB(A) 70-80 dB(A)** 75 dB(A) 65-75 dB(A)** Non Specified Areas 55 dB(A) 50 dB(A) — — *CRS measures maximum noise levels between 7:00am — 7:00pm for daytime and 7:00pm — 7:00am for nighttime. Weld County measures maximum noise levels between 7:00am — 9:00pm for daytime and 9:00pm — 7:00am for nighttime. ** Range reflects the distinction between Light Industrial and Industrial uses made by CRS. 28 Surface and subsurface drainage analysis (21-3-330.B.16) Subsurface drainage would not be impacted by the proposed substation. There would be no direct impacts to water quality associated with regular operation or maintenance of the substation. Project construction would not create runoff in excess of previous site levels and would not adversely affect drainage. The drainage design was prepared to maintain or improve historic flow paths, discharge rates, and water quality. A range of measures ensuring the Project does not impact water quality is listed in Tri-State's Environmental Protection Measures for Construction Projects; prior to construction, a Storm Water Permit for Construction Activities would be acquired from CDPHE. Electric and magnetic field (EMF) modeling and prudent avoidance (21-3-330.C.3) The Colorado PUC requires a utility to apply the concept of prudent avoidance with respect to planning, siting, construction, and operation of substations and transmission facilities. Prudent avoidance incorporates efforts to strike a reasonable balance between the potential health effects of exposure to magnetic fields and the cost and impacts of mitigating such exposure, by taking steps to reduce the exposure at reasonable or modest cost. Such steps might include but are not limited to: (1) Design alternatives considering the spatial arrangement or phasing of conductors; (2) routing lines to limit exposures to areas of concentrated population and group facilities such as schools and hospitals; (3) installing higher structures; (4) widening ROW corridors; and (5) burial of lines. This Project maintains suitable distances from sensitive group receptors like schools and hospitals. The expected levels of EMF for the substation and the Tri-State transmission line connecting to the existing WAPA line were modeled for the Project and were found to be below 150 milligauss (mG), as required by the Colorado PUC (Rules 3206(e) and (f)). At the property line, the EMF levels from the substation will be less than 5 mG. Maximum levels for the transmission tie lines are also predicted to be below 150 mG, with a value of about 38 mG at the edge of the ROW. These levels are similar to magnetic fields generated by common household appliances, power tools, and office equipment (Table 10) and are presumed to be similar to the levels associated with the existing transmission line. The EMF and Audible Noise Study is included with the application. Table 10: Typical 60 Hertz Magnetic Field Levels from Some Common Household Appliances Household appliance Magnetic appliance field 6 inches (mG) from Magnetic field (mG) 2 feet away Dishwasher 20 4 Vacuum cleaner 300 10 Microwave oven 200 10 Computers 14 2 Garbage disposal 80 2 Copy machine 90 7 Fluorescent lights 40 2 29 Compliance with Use by Special Review 1041 Code Requirements Design Standards (23-2-240) Adequate water service (23-2-240.A.1) No water will be required for the operation of the substation. Adequate sewer service (23-2-240.A.2) No sewer service will be required for the operation of the substation. Soil limitations (23-2-240.A.3) The soils at the Iron Mountain Substation have moderate linear extensibility, or soil shrink/swell potential, and have somewhat limited bearing capacity for structures (see Hydrologic, Atmospheric, Geologic, Pedologic, Biotic, Visual, and Noise Impacts (21-3-330.8.15) for more information). A soil report prepared by the NRCS is included with the application. There are no NRCS soil limitations on site. Adequate fire protections (23-2-240.A.4) The substation will be designed with overhead ground wires and grounded structures to protect the system from becoming damaged by lightning. See Hazards and emergency procedures (21-3-330.B.5.g) for additional fire protection measures. Tri-State has created a Facility Emergency Action Plan for the Iron Mountain Substation; it is included with the application. Stormwater drainage requirements (23-2-240.A.5) A range of measures to ensure that the Project does not impact water quality, among other things, is listed in Tri- State's Environmental Protection Measures for Construction Projects, and prior to construction, a Storm Water Permit for Construction Activities will be acquired from the Colorado Department of Public Health and Environment. The Storm Water Management Plan prepared as part of the Storm Water Permit will include the use of sediment control measures, covering of exposed soils, and other established best management practices that will control runoff. See Air and water pollution impacts and control alternatives (21-3-330.B.12) and Surface and subsurface drainage (21-3-330.8.16) for more information. Construction of the Project will not create runoff in excess of previous site levels and will not adversely affect drainage. Drainage from the Iron Mountain Substation would be directed towards a proposed detention pond located immediately north of the facilities on the substation property. The pond will drain to historical drainageways by way of proposed outlet structures. The outlet structures will release flows at a rate below the 100 -year historic discharge rate. Historic flow paths, discharge rates, and water quality would be maintained or improved. A Preliminary Drainage Report is included with the application. 30 Parking and vehicle storage (23-2-240.A.6) During construction, all vehicles will be parked on Tri-State's property proposed for the Iron Mountain Substation; no parking areas will be constructed. See Natural and socioeconomic impacts from construction of the substation (21-3-330.B.7) for more information. Bulk standard requirements (23-2-240.A.7) This Project is located within the Agricultural Zone District. The minimum setback is 20 feet, and the minimum offset is 3 feet, or 1 foot for each 3 feet of building height, as defined in Section 23-3-50 of the Weld County Code. This Project complies with the setback and offset requirements. Safe access (23-2-240.A.8) No adverse effects on county roads are anticipated. An access road will be created off County Road 15. Tri-State will coordinate access road permitting with the County and will comply with all County design standards. All mobile construction equipment will be certified to operate on Interstate highways. There may be short periods of time when traffic will be halted on County Road 15 to allow construction vehicles to enter and exit the construction area. No improvements to roads in Weld County will be required. See Natural and socioeconomic impacts from construction of the substation (21-3-330.B.7) for more information. New public rights -of -way access (23-2-240.A.9) An access road will be created off County Road 15. Tri-State will coordinate access road permitting with the County and will comply with all County design standards. Bufferingorscreening(23-2-240.A.10) Based on discussions with nearby landowners, and the incompatibility of vegetative screening with the existing and proposed transmission and distribution lines, Tri-State is proposing to construct an 8 -foot architectural wall surrounding the substation. No other buffering or screening is proposed. USR in the A -Zone District on prime soils (23-2-240.A.11) All the soils on the property proposed for the substation are considered prime, if irrigated. The minimum acreage necessary for substation construction will be subdivided from the original parcel. The minimal ground impact associated with the transmission lines connected to the substation will allow for continued farming of the majority of the original property. See Hydrologic, atmospheric, geologic, pedologic, biotic, visual, and noise impacts (21-3-330.8.15) for more information. A soils report prepared by the NRCS is included with the application. Sign placement (23-2-240.A.12) One sign will be placed on the substation fence and will comply with the requirements of the Weld County Code. 31 Trash collection areas or facilities (23-2-240.A.13) Dumpsters will be provided for construction waste and will be emptied on a regular or as -needed basis. There will be no permanent trash collection or facilities on site. Operation Standards (23-2-250) Noise standards compliance (23-2-250.A) The Project will be constructed and maintained in accordance with CRS 25-12-101 et seq. (Noise Abatement) and Article IX, Section 14-9-40 et seq. of the Weld County Code. Noise levels for the substation and Tri-State tie lines were modeled and concluded that, at 25 feet from the property boundary, noise levels will be less than the 50 dB(A) allowed in Residential areas under all operating conditions. No mitigation is proposed. The EMF and Audible Noise Study is included with the application. Compliance with Colorado Air Quality Control Commission regulations (23-2-250.8) Construction of the Project is not expected to negatively contribute to the air quality status in the area. There will be no long-term air quality effects associated with routine operation and maintenance of the proposed substation. See Air and water pollution impacts and control alternatives (21-3-330.B.12) for more information. Compliance with Colorado Water Quality Control Commission regulations (23-2-250.C) There will be no direct impacts to water quality associated with the regular operation or maintenance of the substation. See Air and water pollution impacts and control alternatives (21-3-330.8.12) for more information. Lighting standards compliance (23-2-250.D) Lighting will be installed throughout the substation yard and mounted on the exterior of the equipment enclosures and will generally be directed downward and inward into the substation yard. However, lights are generally only for safety purposes in emergency situations when maintenance is required during low light conditions. Substation lighting will not cause a nuisance on adjacent properties. Substation lighting will not cause a traffic hazard on county roads and no colored lights will be used. Heat emission limitations (23-2-250.E) The proposed substation will not raise the temperature of the air more than five (5°) degrees Fahrenheit at or beyond the lot line. See Hazards and emergency procedures (21-3-330.B.5.g) for more information. Property maintenance (23-2-250.F) Tri-State's Environmental Protection Measures for Construction Projects contains a description of revegetation and noxious weed control. Off -site and on -site Improvements Agreement (23-2-250.G) Not applicable. 32 Use by Special Review Questionnaire Planning Questions (23-2-260) Proposed use and need Tri-State is proposing to construct a new 115/12.47 -kV substation in Weld County, south of Windsor, called the Iron Mountain Substation. The substation is being proposed to establish a new delivery point for its Member, PVREA. Tri- State is the wholesale provider of electrical energy to PVREA, who provides retail electrical service to their customers in northern Colorado. PVREA requested a new delivery point substation from Tri-State to serve approximately 25 MW of load growth, which is beyond their current capability. The new substation will serve the new residential development (2000+ homes), apartment complexes, schools, and commercial loads between Windsor and Loveland. Current and previous use of land The Iron Mountain Substation will be built on a property in the northeast quarter of Section 7, Township 5 North, Range 67 West (parcel no. 095707100001). Tri-State is currently working with Weld County to permit a PFD of the original parcel. Pending PFD approval, Tri-State will purchase the subdivided 6 -acre parcel for the Project. This property is currently being used for irrigated crops. No facilities, including buildings, signs, lights, fencing/screening, landscaping, or parking, currently exist on the parcel. Use compatibility (also satisfies 23-2-220.A.3, 23-2-230.B.3) Although the Project is not an agricultural use, many agricultural operations require electricity, which the Project will make available. The Agriculture zoning district is intended to provide areas for energy development as long as it does not interfere with other uses, as outlined in the Weld County Code Section 23-3-10. The surrounding area is largely used for agricultural purposes, oil and gas development, electric transmission, and rural residences. The site has been carefully planned to minimize the loss of agricultural land quality and so as not to interfere with activities on adjacent parcels. Major land cover types near the Project parcel are shown in Figure 6. Proximity to residential structures There are four properties with residences adjacent to the parcel: three across County Road 15 and one across County Road 60. There are multiple oil and gas wells and facilities, including pipelines, in the area as well. The Project will be located approximately 600 feet from the nearest residential structure. Operations The substation will operate 24 hours per day, 365 days per year, other than outages that might be needed for maintenance activities. Lighting will only be on in emergencies. The site will be monitored remotely during operation with infrequent trips to the substation for inspections and occasionally for maintenance. 33 The number of shifts to be worked and the maximum number of employees During construction, one 10 -hour shift will be worked per day with a maximum of approximately 10 workers and an average of 6-7 workers present at any time. The site will be monitored remotely during operation with infrequent trips to the substation for inspections and occasional trips for maintenance. The maximum number of users, patrons, members, buyers or other visitors that the use by special review facility is designed to accommodate at any one time Not applicable. Types and maximum numbers of animals to be concentrated on the site at any one time None. Types and numbers of operating and processing equipment to be utilized The Project will include a new 115/12.47 -kV substation located on lands purchased by Tri-State for the Project. The substation will consist of six 115 -kV disconnect switches, three 115 -kV power circuit breakers, one 30 MVA 115/12.47 kV transformer, and associated metering and relaying. Site preparation will include grading, fencing, grounding, and construction foundations. Tri-State's temporary mobile substation will be removed once the Iron Mountain Substation is energized. Existing and proposed structures There are no existing structures on the Project site except for the WAPA transmission line. Facilities included as part of this Project will be limited to the substation, two three -pole transmission structures, an access driveway, and a temporary mobile substation. The transmission line structures will connect to the existing WAPA transmission line. No buildings will be required for the Project. An electric equipment enclosure (EEE) will be installed within the substation to store control, relay, and metering equipment. The EEE is constructed from pre-engineered metal panels, structural metal framing, or poured concrete. It contains wiring methods and electrical equipment that is concealed or inaccessible for inspection. These structures are often delivered with a UL Certificate of Inspection ensuring compliance with the National Electric Code. The International Building Code, which has been adopted by Weld County, exempts electrical equipment enclosures from building permits: Section [A] 105.23... "a permit shall not be required for the installation, alteration or repair of generation, transmission, distribution or metering or other related equipment that is under the ownership and control of public service agencies by established right." 34 Stockpile, storage, or waste areas and methods of disposal Materials will be temporarily stored at the substation site during construction, but there will be no stockpile of wastes on site. Dumpsters will be provided for construction waste and will be emptied on a regular or as -needed basis. There will be no permanent storage on site. Enclosed containment will be provided for all trash. All construction waste, including trash and litter, garbage, other solid waste, petroleum products, and other potentially hazardous materials, will be removed from the site and transported to a disposal facility authorized to accept such materials. There will be no significant amount of hazardous materials stored in the Project area. See Hazards and emergency procedures (21-3-330.B.5.g) for more information. Construction, operation, and maintenance activities will comply with all applicable federal, state, and local laws and regulations regarding the use of hazardous substances. Construction timetable Construction is scheduled to begin in the 1st quarter of 2026 and the facilities are expected to be in service by the end of 2026. The proposed schedule is shown in Table 11. Table 11: Proposed Project Schedule Milestone Date Weld County Permit Granted July 2025 Construction Begins December 2025 Mobile Substation Install March 2026 Transformer Delivery October 2026 Substation In -Service Date November 2026 Proposed and existing lot surface type An estimated 71,250 square feet of gravel will be used to cover the substation lot surface. The pre -construction lot surface is currently covered by crops. Parking No parking spaces are proposed. Vehicles will park inside the substation fence during inspections and maintenance. Vehicles will park at the substation site during construction. Fencing, screening; and landscaping Based on discussions with nearby landowners, and the incompatibility of vegetative screening with the existing and proposed transmission and distribution lines, Tri-State is proposing to construct an 8 -foot architectural wall surrounding the substation. No landscaping is proposed. 35 Reclamation Tri-State will exercise care to preserve the natural landscape and will conduct its construction operations to prevent any unnecessary destruction, scarring, or defacing of the natural areas in the vicinity of the work. Practices described in Tri-State's Environmental Protection Measures for Construction Projects will be implemented to minimize and mitigate any impacts to environmental resources. Except where clearing is required for permanent work or excavation operations, all vegetation/crops will be preserved and protected from damage by the construction operations and equipment. Fire protection The Project area is located within District 1 of the Weld County Sheriffs Department and is within the jurisdiction of the Windsor Severance Fire Protection District. All applicable fire laws and regulations, as outlined in CRS 31-16-601, will be observed during the construction period. Tri-State will advise construction personnel of their responsibilities under the applicable fire laws and regulations, including taking practical measures to report and suppress fires. As discussed in Hazards and emergency procedures (21-3-330.B.5.g), the structures at the substation will be grounded to prevent arcing. Tri-State prohibits the storage of flammables, the construction of flammable structures, and other activities that have the potential to cause or provide fuel for fires in its substations. There are no explosive substances associated with the proposed substation. All Tri-State electric facilities are designed, constructed, operated, and maintained to meet or exceed all applicable standards of design and performance set forth in the NESC. The Iron Mountain Facility Emergency Action Plan is included with the application. Alignment with the Weld County Comprehensive Plan (23-2-220.A.1, 23-2-230.B.1) The proposed Project has been reviewed alongside the Weld County Comprehensive Plan to be consistent with the Plan's intent, including those principles related to Land Use, Environmental Resources, and Natural Resources. As the most productive county in the state for oil and gas, Weld County has historically been on the forefront of energy development. The current energy transition to electric generation should be no exception. Substations are an integral component of the transmission expansion and electric grid improvements needed to meet future demand. At present, PVREA is experiencing residential and commercial load growth beyond the grid's current capability. The Iron Mountain Delivery Point Project proposes to meet current need in a way that is aligned both with a history of leadership in energy development and community objectives for the future. The Project is consistent with the Plan's goal to support responsible energy development that minimizes its impact on surrounding land and land uses. The proposed substation is located in the Agricultural Zone District. Although it is not an agricultural use, it is a necessary land use that is commonly located in agricultural areas and does not conflict with the goals outlined in the Comprehensive Plan. The site has been carefully planned to minimize its impact to agricultural productivity through its footprint and proximity to agricultural operations on adjacent lands. Impacts to environmental resources such as air, water, waste, noise, and public health will be minimal and limited to the construction period. See Hazards and emergency procedures (21-3-330.B.5.g), Air and water pollution impacts and control alternatives (21-3-330.8.12), and Hydrologic, Atmospheric, Geologic, Pedologic, Biotic, 36 Visual, and Noise Impacts (21-3-330.B.15) in the 1041 permit application for more information. Mitigation practices described in Tri-State's Environmental Protection Measures for Construction Projects will be implemented to minimize impacts to environmental resources. Natural resources such as sensitive wildlife areas, recreation areas, and mineral and energy resources will not be impacted by the proposed Project. Impacts to and proposed mitigation for sensitive wildlife are described in Significant environmentally sensitive factors (21-3-330.G.2.d) and Tri-State's Environmental Protection Measures for Construction Projects. No parks, open space or recreation areas are located near the Project. Intent of the Agricultural Zone District (23-2-220.A.2, 23-2-230.B.2) The proposed Project is located within the Agricultural Zone District. Major facilities of public utilities may be constructed, operated, and maintained in the Agricultural Zone District upon approval of a permit in accordance with the requirements and procedures set forth in Article II, Division 4 of Chapter 23 of the Weld County Code. Major facilities of a public utility are also subject to the provisions of Section 23-4-420. This section of the code states that the applicant shall have the burden of proof to demonstrate that there is a need for the facility within the proposed area of service; this is discussed in the Purpose and need section. Compatibility with future development (23-2-220.A.4, 23-2-230.8.4) The Project is proposed to meet expected load growth associated with future development between Windsor and Loveland. The Project aligns with the guiding principles of Windsor's Comprehensive Plan, including its goal for Growth & Regional Collaboration, which aims to balance population growth with preservation of natural resources and rural areas. The Project's footprint is a least -disruptive pathway to meeting the needs of Windsor's growing population while minimizing impacts to surrounding agricultural uses, natural resources, and the area's rural character overall. The Project also aligns with the tenets of the Town of Windsor's Energy Action Plan as a step towards grid reliability and energy affordability. PVREA forecasts approximately 42 MW of known area load growth developments over the next 4-5 years, with high load growth continuing out to 10 years and beyond. The Iron Mountain Delivery Point Project is part of a coordinated systems response to meet the needs of residential and commercial development and improve area reliability. Other upcoming systems upgrades include adding a transformer at both the existing Kodak and Gateway Substations and uprating the existing Weld — Whitney 115 -kV transmission line. The Weld — Whitney line will be uprated to increase the maximum operating temperature and power flow rating of the existing line to accommodate the anticipated load growth. These upgrades to existing units and facilities, in addition to a new point of power delivery at Iron Mountain, will enable PVREA to reliably support projected load growth. Compliance with Overlay Zoning District or a Special Flood Hazard Area (23-2-220.A.5, 23-2-230.B.5) Not applicable. The Project is not located in any of these classified zoning districts. Conservation of prime agricultural land (23-2-220.A.6, 23-2-230.8.6) The new substation is being proposed to meet the needs of new residential development (2000+ homes), apartment complexes, schools, and commercial loads between Windsor and Loveland, thereby supporting urban and suburban development that is concentrated in urbanizing areas rather than sprawling development that disrupts agricultural 37 landscapes. The site has been carefully planned to minimize its impact to agricultural productivity through its siting and design. In other words, the Project aligns with the following land use goals of section 22-2-30 of the Weld County Comprehensive Plan related to the conservation of agricultural land: Commit to the future of agriculture - the Project will not inhibit agricultural production nor operations on nearby lands and it respects agricultural practices regarding water resources, as it does not require any water use on site. Locate urban development in urban areas - the Project increases infrastructural capacity to meet growing energy needs in urban areas. Harmonize development with surrounding land uses - the Project is compatible with existing land uses and an extension of neighboring energy infrastructure. Protection of public health, safety and welfare (23-2-220.A.7, 23-2-230.B.7) All Tri-State electric facilities are designed, constructed, operated, and maintained to meet or exceed all applicable standards of design and performance set forth in the NESC (2012). Health and safety concerns associated with the Project, therefore, will be limited largely to EMF from the substation. Numerous scientific studies have been conducted to better understand whether there is a possibility that EMF causes disease. The consensus of scientists familiar with these studies is that no significant risk to humans from long-term exposure to EMF has been established. Nevertheless, Tri-State remains sensitive to the EMF issue and responds promptly and accurately to inquiries with currently available information. As corporate policy, Tri-State has adopted programs to ensure that its electric facilities are designed, constructed, and operated to minimize, to the extent prudent and practicable, the level of EMF that is created. Tri-State's position statement on EMF health effects is enclosed with the application. Prudent avoidance, as advised by the Colorado PUC, incorporates efforts to strike a reasonable balance between the potential health effects of exposure to magnetic fields and the cost and impacts of mitigating such exposure, by taking steps with respect to planning, siting, construction, and operation of facilities to reduce the exposure at reasonable or modest cost. Such steps might include but are not limited to: (1) Design alternatives considering the spatial arrangement of phasing of conductors; (2) routing lines to limit exposures to areas of concentrated population and group facilities such as schools and hospitals; (3) installing higher structures; (4) widening ROW corridors; and (5) burial of lines. This Project utilizes a delta design conductor configuration and maintains suitable distances from sensitive group receptors like schools and hospitals. The expected levels of EMF for the substation and Tri-State transmission lines were modeled for the Project and were found to be below 150 milligauss (mG), as required by the Colorado PUC (Rules 3206(e) and (f)). At the property line, the EMF levels from the substation will be less than 5 mG. Maximum levels for the transmission tie lines are also predicted to be below 150 mG, with a value of about 38 mG at the edge of the ROW. These levels are similar to magnetic fields generated by common household appliances, power tools, and office equipment. The EMF and Audible Noise Study is included with the application. See Hazards and emergency procedures (21-3-330.B.5.g) and Electric and magnetic field (EMF) modeling and prudent avoidance (21-3-330.C.3.b) in the 1041 permit application for more information. 38 Irrigation features Not applicable. Compliance with the standards of any Overlay Zoning District Not applicable. State and federal permits Tri-State will apply for a Construction Stormwater Discharge Permit from the Colorado Department of Public Health & Environment. Since the proposed substation will connect to the adjacent transmission line, there is potential that additional permits may be required on account of coordination with WAPA; though, it is anticipated that WAPA will receive a Categorical Exclusion determination from the National Environmental Policy Act review process based on no impacts. WAPA will coordinate their own NEPA compliance. Environmental Health Questions Drinking water source No permanent water supply is proposed. Potable water will be provided during construction by a potable water supplier and minimal quantities of water for construction and dust suppression will be brought in by a water truck on an as -needed basis. Sewage disposal system Not applicable. The use being permitted includes a transmission line and substation, which do not require sewer service. Portable toilets will be used during construction. Storage and warehousing There will be temporary storage of construction materials and equipment at the proposed staging areas. Storage of wastes, chemicals, and/or petroleum Materials will be temporarily stored at the substation site during construction, but there will be no stockpile of wastes on site. Dumpsters will be provided for construction waste and will be emptied on a regular or as -needed basis. There will be no permanent storage on site. Enclosed containment will be provided for all trash. All construction waste, including trash and litter, garbage, other solid waste, petroleum products, and other potentially hazardous materials, will be removed to a disposal facility authorized to accept such materials. Construction, operation, and maintenance activities will comply with all applicable federal, state, and local laws and regulations regarding the use of hazardous substances. The only hazardous chemicals expected to be used on site are those found in diesel fuel, gasoline, coolant (ethylene glycol), and lubricants in machinery. Hazardous materials will not be drained onto the ground or into streams or drainage areas. In its contract with the construction contractor, 39 Tri-State will specify that it will hold a required pre -construction meeting with the contractor to ensure all applicable laws and Tri-State's procedures are followed. Tri-State's Project Environmental Protection Measures for Construction Projects are enclosed with the application. Fuel storage Fuel is typically only required for grading equipment and is contained in a metal storage tank (200 or 500 gallons) on the back end of a pickup truck, which is only on the site temporarily. Vehicle and equipment washing There will be no washing of vehicles or equipment on site. Floor drains and fluid containment Not applicable. Air emissions Construction activities associated with the proposed substation will generate less than significant amounts of particulate matter from soil disturbances and diesel -powered equipment, and less than significant amounts of carbon monoxide and the precursor pollutants to ozone formation from tailpipe emissions. Any air pollutants generated would be widely dispersed across the Project area, short term in duration, and minimized by the small scale of construction operations for the substation. Air pollutants will also be minimized through implementation of dust suppression and proper vehicle maintenance. Therefore, Project construction is not expected to contribute negatively to the air quality status in the area. There will be no long-term air quality effects associated with routine operation and maintenance of the substation. Design and operations plan Not applicable. Nuisance management plan Not applicable. Development Review Questions (8-4-10) Access location and applicable use types Access to the parcel for commercial/industrial use will be necessary. An access road will be created off County Road 15, approximately 975 feet from the nearest intersection with County Road 60. No existing access is present. Anticipated changes to existing access Not applicable. No existing access is present. 40 Existing or proposed access gate The access gate will be set back approximately 170 feet from County Road 15. The gate will be made up of two 15 - foot swing gates. Existing accesses on adjacent and opposite parcels There are four existing accesses within 0.25 miles of the Project on adjacent and opposite parcels off County Road 15 and County Road 60. Three of these accesses connect to County Road 15 and are respectively 650 feet north, 470 feet south, and 1,120 feet south of the Project's proposed access road. The existing access north of the Project's proposed access is the closest to an intersection, located 325 feet from County Road 60. A fourth access in the Project vicinity connects to County Road 60 and is 515 feet away from the intersection with County Road 15. Existing access points to adjacent parcels is depicted on the Plot Plan (Figure 2). Difficulties to traffic visibility There are no anticipated difficulties related to traffic visibility around the proposed access point. The area is characterized by relatively flat, open roads. Horizontal curves There are no horizontal curves around the vicinity of the proposed access points. Topography of the road The road has little topographical diversity in the vicinity of the proposed access point. It is straight with a slight slope. Engineering Questions Preliminary traffic narrative Projected number of vehicle trips to and from the site and types of vehicles used The projected number of vehicle trips to and from the site will vary based on the phase of construction. All trips are expected to occur within the work hours of 7 AM to 7 PM. The following are estimates of the trips per vehicle type over the construction period, with additional personal vehicles used as needed to transport crew members: • Daily construction traffic - 6 to 12 work trucks and/or personal vehicles per day for about 16-20 weeks. • Owner furnished material - S-10 semi tractors with flatbed or lowboy trailers will ship large equipment and steel from Tri-State's Sidney Warehouse to the site. • Transformer installation - typically shipped to site by the manufacturer. O 2-4 semi tractor trucks with flatbed trailers with accessories O 1 heavy haul oversized load O 2-3 flatbed trucks O 1-2 tanker trucks O 1 semi tractor truck with enclosed trailer/processing van 41 • Control house materials and construction — 1 heavy haul oversized load accompanied by a large crane. The crane will likely have a truckload or two of counterweights delivered by semi tractors with flatbed trailers. • Civil haul trucks (number varies depending on job progress) — 2 to 4 roundtrips per day for about a month in the 2nd quarter of construction. Expected travel routes for site traffic During construction, most materials will be received at Tri-State's facility in Sidney, Nebraska or be delivered by Tri-State's selected contractors. Equipment deliveries are expected to come through eastern Colorado (I-76) or through Cheyenne, Wyoming (I-25 North). The transformer and control building materials are typically shipped to the site by the manufacturer, so the exact route is difficult to predict. It is expected that contracted personnel will be traveling from areas relatively local to the site. Travel distribution along the routes It is expected that construction personnel will be coming from all areas of the Front Range. The transformer and control building materials are typically shipped to the site by the manufacturer, so the exact route is unknown. An estimated 50% of construction traffic could come from Cheyenne, Wyoming along I-25 or Sidney, Nebraska along -80 and I-25. Approximately 30`)/0 of construction traffic could come from the Denver Metro Area along I-25 and Highway 34, and the remainder could come from miscellaneous routes. Highest traffic volumes to and from the site by time of day One 10 -hour shift per day will be worked during construction; the site will be monitored remotely during operation. The highest traffic volumes will be expected when construction personnel are entering the site in the morning and exiting the site in the evenings. MS4 requirements The Project is not in an MS4 area. Building Questions Existing and proposed structures No buildings are proposed and there are no existing structures on the property. An electric equipment enclosure (EEE) will be installed within the substation to store control, relay, and metering equipment. The EEE is constructed from pre-engineered metal panels, structural metal framing, or poured concrete. It contains wiring methods and electrical equipment that is concealed or inaccessible for inspection. These structures are often delivered with a UL Certificate of Inspection ensuring compliance with the National Electric Code. The International Building Code, which has been adopted by Weld County, exempts electrical equipment enclosures from building permits: 42 Section [A] 105.23... "a permit shall not be required for the installation, alteration or repair of generation, transmission, distribution or metering or other related equipment that is under the ownership and control of public service agencies by established right." Existing structures use for this USR Not applicable. Proposed use(s) of each structure. See Existing and proposed structures above. 43 Figures Figure 1: Vicinity Map Figure 2: Plot Plan Figure 3: Five Mile Radius Map (sent separately with application) Figure 4: Nearby Substations Map (sent separately with application) Figure 5: Water Resources Map Figure 6: Land Cover Map 44 Figure 1: Vicinity Map • LIND LAND CI MPAN Y�INIC.I LIND MARTIN FRANK THOMAS LIVING TRUST Ws TELL'INGHUISEN MARCIA LIND THEODORE JNIESS B ARl NAM I SORENSENI __SDRENSE A0 OBERTIERIC ROBERTIERIC LIVING ill -1:41G TRUST MARTIN MELVIN = vats ZEILER FARMS PAMELA K0 LT (331387%4iNT) FARMS INC DANIEL J COX+IRA D FAGERSTONE HINSON VERNON,L AIMS COLLEGE PARTNERS WIC PARTNERS TROLLCO INC SCHMERGE THOMAS P' -� T iNINDSONG:RANCH HOIMIEUWNERS'ASSOC INC' SUER KENNETH TAYLORTAYLOR LUCASPRICE JA !(, KEG_ ,WINDSONG RANCRITHOMEOWNERS ASSWINC WEILER BRADLEY WAYNE TRUST �P4OH it DAII'ID slm �' ` DETTMANN TER_ RY - TRUST CQL'BER �.B . . QENISEITR.US MONTGOMERY' "JA'SON'LOUIS` .h l;f COMBS -KELLY �rL'IVIWa TRUST A � SMITH � i TAYLORIHILTTTL MARINELARENA ti LILIANA I 5900 LLC �, 4 •u WINDSOR I SOUTHATE DEVELtOP,MENTTijLLC WINDSOR SOUTHGATE DEVELOPMENTiLLC --GRAND �,KLLC DISTRICT WINDSOR'SDUTHGATE _ DEVELOPMENT WINDSOR " LLC SOUTHGATE DEVELtOPMENTrLL �C WINDSOR.SOUTHGATE DEVEL"O'ME TITI CC' DEVELOPMENT LLC 'I EAGLE L ..�.- CRC7SSING ��DEVELOPIVIENT-INC= WINDSOR SOUTHGATEc ___---r. DEVELOPMENTLLC� SB.VENTURESI LLC � 11T I , i EAGLE G1hfM ENTERPRISES LLC CROSSING - A PS RICAN DEVELOPMENT INC EAGLE PROPERTIES INC `*+LAST DANCE LLC 11 I EAGLE HIP` CROSSING HOLD NGS_LL C DEVE�LO�•PMENT lie �. SOUTI-Ip TAE ONE LLC-1, 1 WINDSOR fSOUTHGATE DEVELOPMENT LLC 1I .I \\ HOLDING' I Lilt Tri-State Generation and Transmission Iron Mountain Delivery Point Vicinity Map O Project Parcel Pre -PFD Parcel Street Transmission Line - Other Utility Township/Range Section Parcels IV Half Mile Radius r Municipality Boundary - Windsor Sail Classification Aquolls and Aquepts - Prime farmland Colby loam - Farmland of statewide importance Colby loam - Prime farmland IGm loam - Farmland of local importance Kim loam - Prime farmland Weld loam - Farmland of statewide importance Weld loam - Prime farmland Weld loam- Prime farmland Wiley -Colby complex - Farmland of statewide importance Wiley -Colby complex - Prime farmland Wiley -Colby complex, - Farmland of statewide importance Annual Flow fcfs] 0 - 5,400 Other Water Features - Ephemeral/Intermittent Lakes, Ponds, Reservoirs, and Estuaries OTRI-STATE G&T Contact: (303) 452-6111 1100 W 116th Ave, Westminster, CO 80234 I Miles 0 0.05 0.1 0.2 Updated By: aaherg Updated: 9/113/2024 This map includes confidential information of Td -State and third parties The GIS data and maps may not be disclosed to any third party The user agrees to keep this information confidential and not disclose it to third parties. if you have any questions regarding this, please contact theTri-State legal department. GIS data and maps available to Tri- State Generation and Transmission Association employees are provided as general information to aid Tri-State ransmisslon maintenance_ No user of TM -Slate's GIS data and maps may sell any portion of the information provided therein. Tri-State makes no warranty regarding accuracy or completeness of the data and maps Users shall rely only upon proper field verification of Tri-State GIS data Regional Map Fort !I I i n { I L um' Document Path: llhgstarelgeostore4ProductslCapitalPrajecis\CP9988_IronMountain_Sub!MapsWeGJSPro_ProjectsllronMountainh4aps aprx Figure 2: Plot Plan Figure 5: Water Resources Map 49 Tri-State Generation and Transmission Iron Mountain Delivery Point Water Resources +D Project Parcel a Pre -PFD Parcel Transmission Line - Other Utility National Hydrography Dataset Annual Flow (cfs) 0 - 5,000 Other Water Features Ephemeral/Intermittent Lakes, Ponds, Reservoirs, and Estuaries Wetlands Marsh, Swamp, Bog, Prairie River Lake, Reservoir "ask TRI-STATE G&T �i -1 6�.,JOLVIL LS:.. -T w Contact: (303) 452-6111 pmA'IPn �Yi .v.e..m� i 1100 W 116th Ave, Westminster, CO 80234 0 0.05 0.1 Updated By: aaherg Updated: 9/18/2024 1 Miles 0.19 This map includes confidential information of Tri-State and possibly third parties. The user agrees to keep this map and the GIS data included within it confidential, and more specifically, user will not duplicate, forward, sell, or otherwise disclose this map or any of the data contained within it to third parties. Tri-State makes no representation or warranty whatsoever regarding the accuracy or completeness of this map or the data contained within it. Users are encouraged to independently verity Tri-State GIS data and are solely responsible for such verification. Air information depicted on this map is subject to revision as better data is made available. Questions regarding this map or the GIS data contained within it should be directed to Tri-State's GIS Manager. Regional Map Document Path: llhgstorelgeostore4ProductslCapitalProjects\CP9988_IronMountain_Sub!MapsWeGJSPro_ProjectsllronklountainMaps aprx Figure 6: Land Cover Map Tri-State Generation and Transmission Iron Mountain Delivery Point Land Cover a Project Parcel Pre -PFD Parcel Transmission Line - Other Utility County Boundary USA NILCD Land Cover Open Water Developed Open Space Developed Low Intensity Developed Medium Intensity Developed High Intensity Barren Land Shrub/Scrub Grassland/Herbaceous Pasture/Hay Cultivated Crops Woody Wetlands Emergent Herbaceous Wetlands Contact: (303) 452-5111 1100 W 115th Ave, Westminster, CO 84234 11_1 a 0.05 0.1 Updated By: aaherg Updated: 9/18/2634 Miles 0.2 This map includes confidential information of Tri-State and possibly third parties. The user agrees to keep this map and the GIS data included within it confidential, and more specifically, user will not duplicate, forward, sell, or otherwise disclose this map or any of the data contained within it to thrrd parties. Tri-State makes no representation or warranty whatsoever regarding the accuracy or completeness of &Ns map or the data contained within it. Users are encouraged to independently verify Tri-State GIS data and are solely responsible for such verification. All information depicted on this map is subject to revision as better data is made available. (questions regarding this map or the GIS data contained within it should be directed to Tri-State's GIS Manager. Docurnenl Path IlhgstorelgeostorelProductslCapitalProjectslCP9988_IronAtuntain_SublMapslAreGISPro_ProjectsllronMountainMaps am( References Chapman, S.S., G.E. Griffith, J.M. Omernik, A.B. Price, J. Freeouf, and D.L. Schrupp. 2006. Ecoregions of Colorado. Available online at: https://gaftp.epa.gov/EPADataCommons/ORD/Ecoregions/co/co front.pdf (accessed September 2024). CNHP (Colorado Natural Heritage Program). 2024. CODEX: Colorado's Conservation Data Explorer. Available online at: https://codex.cnhp.colostate.edu/ (accessed September 2024).code CPW. 2024a. Threatened and Endangered Species List. Available online at https://cpw.state.co.us/threatened-and- endangered-wildlife (accessed September 2024). Federal Emergency Management Agency. 1997. Flood Insurance Rate Map, Weld County, Colorado and Incorporated Areas, Panel 08123C1495F. NRCS. United States Department of Agriculture. Web Soil Survey. Accessed at: http://websoilsurvey.sc.egov.usda.gov/ July 8, 2024. USFWS, Southwest Region. 2019. "Species Status Assessment Report for the Eastern Black Rail (Laterallus jamaicensis jamaicensis)." Accessed at: https://ecos.fws.gov/ServCat/DownloadFile/186791 July 3, 2024. USFWS. 2024. Information for Planning and Consultation System. Available online at: https://ipac.ecosphere.fws.gov/ (accessed September 2024). 53 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A TRI-STATE GENERATION He TRANSMISSION, INC. IRON MOUNTAIN SUBSTATION PRELIMINARY DRAINAGE REPORT November 14, 2024 Prepared by: INt was ,_ SNP it a_ s: DELeMONT CONSULTANTS, INC. ENGINEERING v SURVEYING a MI a. F EISIOH 125 Colorado Ave. v 'Montrose, GO 81401 01 v (5 70) 249-2251 w f970) 249-2342 Fes' www.delsmont.com serviceadeiiniont_com TRI-STATE GENERATION & TRANSMISSION, INC. Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A IRON MOUNTAIN SUBSTATION PRELIMINARY DRAINAGE REPORT Design Engineer's Statement: The attached drainage plan and report were prepared under my direction and supervision and are correct to the best of my knowledge and belief. Said drainage report has been prepared according to the criteria established by the County for drainage reports and said report is in conformity with the applicable master plan of the drainage basin. I accept responsibility for any liability caused by any iegligenta t , ern s or tyimissi ns on my part in preparing this report. David Schieldt Registered Professional Engineer State of Colorado No. 47195 \\htzuz4 Date Owner/Developer's Statement: I, the owner/developer have read and will comply with all of the requirements specified in this drainage report and plan. —��DocuSi�ned by: BraP4346317 P464... _ H. Steven Gray Senior Manager, Permitting, & Land Rights, Tri-State Generation & Transmission Association, Inc. 1100 W. 116th Ave Westminster, CO 80234 11/18/2024 Date COUNTY ACCEPTANCE This report has been reviewed and found to be in general compliance with the Weld County Engineering and Construction Guidelines. The accuracy and validity of the engineering design, details, dimensions, quantities, and concepts in this report remains the sole responsibility of the professional engineer whose stamp and signature appear hereon: Accepted by: County Engineer Date 1Ji7� n am �f r Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A TABLE OF CONTENTS 1.0 General Location and Description 1.1 Site Location 1.2 Site Description 2.0 Drainage Basins and Sub -Basins 2.1 Existing Drainage Sub -Basins 2.2 Proposed Drainage Sub -Basins 3.0 Drainage Design Criteria 3.1 Methodology 3.2 Land Cover Hydrologic Properties 3.3 Weighted Design Values 4.0 Drainage Facility Design 4.1 Historical Drainage 4.2 Proposed Drainage 5.0 Conclusions 5.1 Drainage Concept 5.2 Compliance with Common Practices 6.0 References Appendix A — Site Specific Physical Design Properties Appendix B — SSA Modeling Results Appendix C — Site Maps Iron Mountain Substation Drainage Report 1-1 1-1 1-1 2-1 2-1 2-1 3-1 3-1 3-1 3-1 4-1 4-1 4-1 5-4 5-4 5-4 6-1 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 1.0 General Location and Description Tri-State Generation and Transmission (TSGT) in coordination with Del -Mont Consultants, Inc. (DMC) is in the process of designing a new substation yard. The scope of work includes the construction of the substation yard, driveway, detention pond and swales, installation of new perimeter fence, and the addition of high voltage electrical equipment and facilities. The purpose of this report is to present the findings from the hydrologic and hydraulic analyses that were performed on the existing property as well as present the results from a detailed analysis performed on the proposed improvements to the property. 1.1 Site Location The proposed substation yard is located on a 5.97 -acre parcel owned by TSGT, situated in the NE I/4 of Section 7, Township 5 North, Range 67 West, 6th Principal Meridian in Weld County, Colorado. The substation site is accessed from County Road 15. The site is greater than 1/4 miles from any municipal boundaries and therefore classified as a non -urbanizing area. 1.2 Site Description The site naturally drains to the northeast and is currently a cultivated agricultural field. There are currently no features on the site to provide water quality or quantity treatment for discharge from the site. Site layout details will be discussed in more detail in Section 2. There are currently no developments on the properties neighboring the site. No wetlands are present on the site and the site is not located within a floodplain per FIRM Map Number 08123C1495F. To the knowledge of Del -Mont Consultants, no prior drainage studies have been conducted on this property. Iron Mountain Substation Drainage Report 1-1 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 2.0 Drainage Basins and Sub -Basins The property functions as a single drainage basin, flowing to the south overland to Pond Creek, ultimately flowing into the Cache la Poudre River. Proposed conditions produce several smaller sub -basins and will be discussed in detail in the following sections. 2.1 Existing Drainage Sub -Basins The existing site was analyzed as two basins; the existing property and one offsite basin to account for run-on. A map illustrating the delineation of the existing property can be found in Appendix C. There are no developments on the neighboring properties. Table 2-1 presents the existing basin and its corresponding acreage. Table 2-1: Existing Basin Acreages Sub -Basin Total (Acres) Area 5.97 Ex Ex -OS 10.41 2.2 Proposed Drainage Sub -Basins The proposed conditions will produce several smaller sub -basins. The proposed site is divided into 3 different sub -basins; Yard, Proposed West, and Proposed East. A map illustrating the delineation of the sub -basins can be found in Appendix C. The yard area contains the entirety of the substation yard and the detention pond. This makes up greater than 90% of the impervious or improved areas and will be treated. The remainder of the impervious area consists of the access driveway, which creates negligible runoff and will continue to follow historic flow paths. The Proposed basins will follow historical discharge patterns, with a swale and culvert to direct flows under the access driveway. Two offsite basins have been analyzed to size swales and direct run-on around the site. The majority of the proposed basins will not be disturbed during construction and will not require water quality treatment. The disturbed areas of the proposed basins will be reseeded, and total less the 1 acre. Table 2-2 presents the proposed sub -basins and their corresponding acreages. Table 2-2: Proposed Sub -Basin Acreages Sub -Basin Total (Acres) Area Yard 2.58 P -West 1.32 P -East 2.07 OS -West 4.00 OS -East 6.41 Iron Mountain Substation Drainage Report 2-1 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 3.0 Drainage Design Criteria 3.1 Methodology The hydrologic/hydraulic analysis of the site was performed using the Autodesk Storm and Sanitary analysis utilizing the Rational Modified FAA Method model for a 10 -year and a 100 - year rainfall event. Runoff Coefficients were obtained from Weld County Engineering and Construction Criteria, Chapter 5, Section 5.1, Table 5-4. Rainfall Intensity was obtained from WCECC, Section 5.4.1.1 using equation 5.4.1 and NOAA Atlas 14 rainfall data. Modeling results are presented in Appendix B. All calculations utilized to determine the required water quality capture volume (WQCV) and detention and to aid in the design the outlet structure used the equations provided in Chapter 5 of the Weld County Engineering and Construction Criteria. The spreadsheets can be found in Appendix A and are discussed in more detail in Section 4.0. Soil data was obtained from a USDA Soils Report and gives a hydrologic soil group B for the site. The soils report is included in Appendix A. The described methods/tools used in the analysis, are in accordance with common engineering practices and guidelines. 3.2 Land Cover Hydrologic Properties Runoff Coefficients and Percent Impervious numbers, for hydrologic soil group B, were assigned to the various land cover types found on the project, both existing and proposed, and are presented in Table 3-1. Table 3-1: Land Cover Hydrologic Properties Land Cover Type Impervious Percent Runoff Coefficient 10 Year Runoff Coefficient 100 Year Packed Gravel 40 0.36 0.41 Flow Analysis 2 0.17 0.36 Historical Pond 100 0.92 0.96 3.3 Weighted Design Values Utilizing the land cover hydrologic properties presented above, a weighted Runoff Coefficient and Percent Impervious value was calculated for each of the sub -basins, presented in Section 2.0 to be used for analysis. Table 3-2 presents the weighted design values for existing conditions and Table 3-3 presents the weighted design values for proposed conditions. Detailed calculations can be found in Appendix A. 3-1 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Table 3-2: Existing Sub -Basin Weighted Design Values Sub -Basin Total (Acres) A Area r Impervious Weighted Percent t Weighted Coefficient 10 R Runoff year Y Weighted Runoff R Coefficient 100 n year Y ff Ex 5.97 2% 0.17 0.36 Ex -OS 10.41 2% 0.17 0.36 Table 3-3: Proposed Sub -Basin Weighted Design Values Sub -Basin Total (Acres) Area Weighted Percent Weighted Coefficient Runoff Weighted Coefficient Runoff Impervious e 10 year 100 year r Yard 2.58 50% 0.45 0.50 P -West 1.32 5% 0.19 0.36 P -East 2.07 2% 0.17 0.36 OS -West 4.00 2% 0.17 0.36 OS -East 6.41 2% 0.17 0.36 3-2 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 4.0 Drainage Facility Design 4.1 Historical Drainage Per common practice, the 100 -year historical discharge value for the site shall be used to determine the allowable discharge from the site for the proposed conditions. Values presented in Table 3-2 were used in the model to calculate a historical discharge rate for the existing property. Table 4-1 presents the discharge rate for the existing property for both the 10 -year and 100 -year 1 -hour storm events although the design is based on the 100 -year discharge values. Table 4-1: Existing Property Discharge Values Sub -Basin 10 -Year Discharge (CFS) 100 Discharge -Year (CFS) Ex 1.43 6.1 Ex -OS 2.50 10.64 4.2 Proposed Drainage Values presented in Table 3-3 were utilized in the model to calculate the runoff for the proposed conditions. Equation 5.10.2.1 from the Weld County Engineering and Construction Criteria was utilized to determine the WQCV in conjunction with the model to size the detention pond. Once the pond was sized, the Mile High Flood District Detention Basin Design Workbook was utilized to estimate required orifice sizes in the outlet structure to provide water quality treatment. The model was then used to verify all design elements of the pond and the outlet structure to ensure the pond not only retained the correct WQCV but to also discharge at or less than the required 100 -year historic discharge rate presented in Table 4-1 as well as drain the pond in less than the allowable time per State Requirements. The spreadsheet showing the detailed calculations can be found in Appendix A. The design of the outlet structure is detailed in the grading drawings. The drainage swales that will receive run-on flows were designed per Weld County requirements with a 2 -foot flat bottom and 4:1 side slopes. These swales were analyzed in the model to verify adequate capacity. Values are presented in Table 4-2. Table 4-2: Swale Capacity (100 -year event) Drainage Feature Total Capacity (cfs) Required Capacity Flow (cfs) Capacity Remaining (cfs) West Swale 41.41 4.13 37.22 East Swale 64.69 6.64 57.97 4-1 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A The proposed detention pond was designed to provide water quality treatment as well as detain the 100 -year storm event while maintaining the required 1 -foot of freeboard. The proposed detention pond stage -storage curve is presented in Table 4-3. The emergency spillway has been designed to convey the entirety of the 100 -year storm event while maintaining 1 foot of freeboard. Calculations can be found in Appendix A. Table 4-3: Detention Pond Stage -Storage Table Elevation Surface (Sq. Area Ft.) 4917.5 10 4918 2,104 4918.5 6,244 4919 9,806 4919.5 10,924 4920 12,066 4920.5 13,237 4921 14,437 The model of the proposed site conditions was utilized to calculate discharge flow rates from the outlet structure in order to size the pond discharge culvert. The culvert was sized to pass the entirety of the 100 -year event should the orifice plate clog. Table 4-4 presents the hydraulic capacity of the culvert and the required capacity to discharge flow from the outlet structure for the 100 -year event. Hydraulic calculations for the remainder of the piping systems and corresponding capacities are found in Appendix B. Table 4-4: Outlet Pipe Hydraulic Capacity (100 -year event) Drainage Feature Pipe Diameter (in) Total Capacity (cfs) Required Capacity Flow (cfs) Capacity Remaining (cfs) Pond Outlet 15 5.05 3.66 1.39 4-2 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Table 4-5 presents the discharge rates for the proposed sub -basins for both the 10 -year and 100 -year 1 -hour storm events prior to detention. This discharge value represents the flow rate that the pond is receiving. The discharge from the pond and other basins (total discharge from site) is summarized in Table 5-1. Table 4-5: Proposed Sub -Basin Discharge Values (Pre -Detention) Sub -Basin 10 Discharge -Year (CFS) 100 Discharge -Year (CFS) Yard 1.64 3.66 P -West 0.35 1.35 P -East 0.50 2.12 OS -West 0.96 4.09 OS -East 1.54 6.55 Utilizing the flow rates presented above, the model was utilized to analyze the flow path of water through the piping and pond system. With the installation of the outlet structure, the pond was designed to pass both the 10 -year and 100 -year events, treat the required WQCV, and slowly release the water in the required length of time after the end of an event set forth by the State. The entire substation drains to the pond and the discharge rate leaving the pond is presented in Table 5-1. 4-3 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 5.0 Conclusions 5.1 Drainage Concept The drainage design has been prepared using sound engineering judgement and practices, with the health and safety of Weld County in mind, and will provide an effective means of controlling runoff on the project site as well as protect the site from damage. The design has been completed according to common engineering practices and will result in no downstream impacts to the well-being of any residents, property, or infrastructure. Historic flow paths, discharge rates, and water quality have been maintained or improved. 5.2 Compliance with Common Practices Per common practices, the historical discharge rate from the 100 -year storm shall be utilized to determine the allowable discharge rate for the proposed improvements. To demonstrate compliance with this requirement, both the existing and proposed conditions were combined into one overall sub -basin. Table 5-1 presents the overall discharge rates for the entire drainage area after detention. Table 5-1: Overall Discharge Values (Post Detention) 10 -Year (CFS) Discharge 100 -Year (CFS) Discharge Existing Proposed Existing Proposed 3.93 3.39 16.75 14.19 The pond outlet structure was sized according to common practices so that the proposed condition 100 -year discharge rate is less than the required discharge rate from the 100 -year storm event, resulting in compliance with common practices. The detention pond was also sized according to UDFCD requirements to treat the WQCV, detain the 100 -year event, maintain 1 foot of freeboard, and maintain historical discharge patterns resulting in no downstream impacts. Inspections of the pond and outlet structure will be conducted by the owner on an annual basis as well as after large storm events. If deficiencies are identified or if maintenance is required, maintenance of the outlet structure will be performed by the owner of the property in an effort to return the structure to its original level of functionality. Maintenance may involve cleaning of sediment and debris from the facility, maintaining vegetation growth around the structure, and performing any additional maintenance required. 5-4 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 6.0 References United States Department of Agriculture Natural Resources Conservation Service. Web Soil Survey Mile High Flood District and Flood Control District. Detention Basin Design Workbook, Version 4.04, February 2021. Urban Drainage and Flood Control District. Urban Storm Drainage Criteria Manual, Volume 1-3, June 2001. El Paso County, Colorado, Drainage Criteria Manual, Volume 1-2, October 31, 2018 El Paso County, Colorado, Engineering Criteria Manual, December 13, 2016 Yeh and Associates, Inc. Geotechnical Engineering Study, Iron Mountain Substation. Yeh Project Number 221-290. November 11, 2021 6-1 Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Appendix A Site Specific Physical Design Properties Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Iron Mountain Drainage Design Existing Conditions -10 Year Total Area Area Name Ex Ex -OS (sf) 259835.71 453559.13 (acres) 5.97 10.41 Flow Length 500 500 Slope (%) TOC (min) 3.0% 3.0% 26.13 26.13 Land Cover Type Percent Impervious Runoff Coefficient Historical Flow Analysis Gravel Pond 2% 40% 100`)/0 0.17 0.36 0.92 Roughness Coefficient and Curve Number Analysis Ex -1 Description Existing Site Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 5.97 5.97 0.17 2% Runoff Coefficient 0.17 sum Weighted A*C Percent Impervious A*% 1.01 2% 12% 1.01 12% 0.17 2% Ex -OS Description Existing Site Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 10.41 10.41 0.17 2% Runoff Coefficient 0.17 sum Weighted A*C Percent Impervious A*% 1.77 2% 21% 1.77 21% 0.17 2% Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Iron Mountain Drainage Design Existing Conditions -100 Year Total Area Area Name Ex Ex -OS (sf) 259835.71 453559.13 (acres) Flow Length Slope (°/0) TOC (min) 5.97 10.41 500 500 3.0% 3.0% 20.79 20.79 Land Cover Type Percent Impervious Runoff Coefficient Historical Flow Analysis Packed Gravel Pond 2% 40% 100°/0 0.36 0.5 0.96 Roughness Coefficient and Curve Number Analysis Ex Description Native Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient A*C Percent Impervious A*% 5.97 0.36 2.15 2% 12% sum 2.15 12% Weighted 0.36 2% 5.965 0.36 2% Ex -OS Description Native Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient A*C Percent Impervious A*% 10.41 0.36 3.75 2% 21% sum 3.75 21% 10.412 Weighted 0.36 2% 0.36 2`)/0 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Iron Mountain Drainage Design Proposed Conditions -10 Year Total Area Area Name (sf) (acres) Flow Length Slope (%) TOC (min) Yard P -West P -East OS -West OS -East 112285.885 57590.842 89958.986 174314.663 279244.462 2.58 1.32 2.07 4.00 6.41 100 100 100 500 500 1.5% 3.0% 3.0% 3.0% 3.0% 10.25 11.48 11.69 26.13 26.13 Land Cover Type Percent Impervious Runoff Coefficient Historical Flow Analysis Gravel Pond 2% 40% 100% 0.17 0.36 0.92 Roughness Coefficient and Curve Number Analysis Yard Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 2.16 0.00 0.42 2.58 0.45 50`)/0 Runoff Coefficient 0.36 0.17 0.92 sum Weighted A*C 0.78 0.00 0.38 1.16 0.45 Percent Impervious 40% 2% 100% A*% 86.4% 0.0% 41.8% 128.2% 50% P -West Description Driveway (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 0.11 1.21 0.00 1.32 0.19 5% Runoff Coefficient 0.36 0.17 0.92 sum Weighted A*C 0.04 0.21 0.00 0.25 0.19 Percent Impervious 40% 2% 100% A*% 4.6% 2.4% 0.0% 7.0% 5% P -East Description Driveway (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 0.00 2.07 0.00 2.07 0.17 2% Runoff Coefficient 0.36 0.17 0.92 sum Weighted A*C 0.00 0.35 0.00 0.35 0.17 Percent Impervious 40% 2% 100% A*% 0.0% 4.1% 0.0% 4.1% 2% Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A OS -West Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient A*C Percent Impervious A*°/0 0.00 0.36 0.00 40% 0.0% 4.00 0.17 0.68 2% 8.0% 0.00 0.92 0.00 100% 0.0% sum 0.68 8.0% Weighted 0.17 2% 4.00 0.17 2% OS -East Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient A*C Percent Impervious A*°/0 0.00 0.36 0.00 40% 0.0% 6.41 0.17 1.09 2% 12.8% 0.00 0.92 0.00 100% 0.0% sum 1.09 12.8% 6.41 Weighted 0.17 2% 0.17 2% Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Iron Mountain Drainage Design Proposed Conditions -100 Year Area Name Total Area (sf) (acres) Flow Length Slope (%) TOC (min) Yard P -West P -East OS -West OS -East 112285.885 57590.842 89958.986 174314.663 279244.462 2.58 1.32 2.07 4.00 6.41 100 100 100 500 500 1.50% 3.00% 3.00% 3.00% 3.00% 9.49 9.25 9.30 20.79 20.79 Land Cover Type Percent Impervious Runoff Coefficient Historical Flow Analysis Packed Gravel Pond/Swale 2% 40% 100% 0.36 0.41 0.96 Roughness Coefficient and Curve Number Analysis Yard Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 2.16 0.00 0.42 2.58 0.50 50% Runoff Coefficient 0.41 0.36 0.96 sum Weighted At 0.89 0.00 0.40 1.29 0.50 Percent Impervious 40% 2% 100% A*°/ 0 86.4% 0.0% 41.8% 128.2% 50% P -West Description Driveway (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 0.11 1.21 0.00 1.32 0.36 50/0 Runoff Coefficient 0.41 0.36 0.96 sum Weighted At 0.05 0.43 0.00 0.48 0.36 Percent Impervious 40% 2% 100% A*T 0 4.6% 2.4% 0.0% 7.0% 5% P -East Description Driveway (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) 0.00 2.07 0.00 2.07 0.36 21)/0 Runoff Coefficient 0.41 0.36 0.96 sum Weighted A*C 0.00 0.74 0.00 0.74 0.36 Percent Impervious 40% 2% 100% A*°/ 0 0.0% 4.1% 0.0% 4.1% 2% Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A OS -West Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient A*C Percent Impervious A*% 0.00 0.41 0.00 40% 0.0`)/0 4.00 0.36 1.44 2% 8.0% 0.00 0.96 0.00 100% 0.0% sum 1.44 8.0% Weighted 0.36 2% 4.00 0.36 2')/0 OS -East Description Substation Yard (Gravel) Native Pond Total Area (ac) Weighted Runoff Coefficient Weighted Percent Impervious Total Area (ac) Runoff Coefficient Alt Percent Impervious A*% 0.00 0.41 0.00 40% 0.0`)/0 6.41 0.36 2.31 2% 12.8% 0.00 0.96 0.00 100% 0.0% sum 2.31 12.8% 6.41 Weighted 0.36 2% 0.36 21)/0 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Detention Pond Outlet Pipe Elev Inv. Orifices Elevation . Depth (FT"2) Area Volume (FT^3) Orifice Bottom CL # Req d . Sq. Each Inches Dia. (In.) Spacing (in) 4917.5 0 10 _ 4916.92 e& 5 0.307 5/8 6.0 4918 0.5 2104 4917.o.s 0.44 3/4 4918.5 1 6288 Lot 4918. ii 0.44 3/4 4919 1.5 9806 5650 4918.01 0.44 3/4 4919.5 _ 2 10924 11833 4919.17_ 0.44 4920 2.5 12066 .756,. 4920.5 3 13237 23906 4921 3.5 14437 lnnr Basin Area Imperviousness 2.58 50% i WQCV WQCV WQCV WQCV 10 Year 10 Year 100 Year 100 Year (FT^3) (AC -FT) Depth WSEL Depth WSEL Depth WSEL 1929.91 r r 0.8s T4918.39 r 1.41 2.091 4919.SS Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Iron Mountain Spillway Sizing 11-4-2024 Calculated by: Thayne Clement Trapezoidal Broad -Crested Weir Sizing Francis Weir Equation: Q=2/3 C1 bd2g H^(3/2) Solve For b: b=Q/(2/3 Cl V2g H^(3/2) ) Variable Input Units Discharge Rate (Q) 3.66 cfs Disharge Coefficient (C1) 3.33 Weir Height (H) 1.25 ft Gravity Constant (g) 32.2 ft/s"2 Required Freeboard 1 ft Width of Weir (b) - Required ft Width of Weir (b) - Provided 2 ft NOAH Atlas 14, Volume 8, Version 2 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Windsor, Colorado, USA* r V V N i■ V. ■ ■. M■ ■. V. 4' 4's.;. I Latitude: 40.4187°, Longitude: -104.9269° Elevation: 4919 ft's* * source: ESRI Maps **source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES 6 ti j3WII• . Ere" 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 PFgraphicalI Maps & aerials PF tabular fPDS-based point precipitation frequency estimates with 90% confidence intervals (in inches) Duration 5 -min 10 -min 15 -min 30 -min 60 -min 2 -hr 3 -hr 6 -hr 12 -hr 24 -hr 2 -day 3-dayJ 4 -day 7 -day Average recurrence interval (years) 1 0.243 (0.188-0.314) 0.356 (0.276-0.460) 0.434 (0.336-0.562) 0.578 (0.447-0.747) 0.715 (0.554-0.925) 0.853 (0.666-1.09) 0.938 (0.736-1.19) 1.10 0.871-1.38) 1.30 (1.04-1.61) 1.56 (1.26-1.92) 1.80 1.46-2.19 1.96 (1.60-2.37) 2.09 1.71-2.51) 2.36 (1.95-2.82) 2.61 10 -day (2.17-3.10) 20 -day 30 -day 3.35 (2.80-3.93) 3.93 (3.31-4.58) 45 -day][ 4.63 J (3.92-5.36) 60 -day 5.18 (4.41-5.97) 0.291 (0.225-0.376) 0.425 (0.329-0.551) 0.519 (0.401-0.672) 0.689 (0.533-0.892) 0.845 (0.653-1.09) 1.00 (0.780-1.28) 1.09 (0.855-1.39) 1.28 (1.02-1.62) 1.54 (1.23-1.92) 1.83 (1.47-2.26 2.13 (1.73-2.59) 2.29 (1.87-2.78) 2.43 (1.99-2.93) 2.77 (2.29-3.31) 0.387 (0.298-0.502) 0.566 (0.436-0.735) 0.690 (0.532-0.896) 0.916 (0.706-1.19) 1.12 (0.861-1.45) 1.32 (1.02-1.69) 1.43 (1.12-1.83) 1.68 (1.32-2.12) 2.01 (1.60-2.51) 2.35 (1.88-2.90) 2.71 2.20-3.32 2.89 (2.35-3.51) 3.04 (2.48-3.67) 3.47 (2.86-4.16) 3.07 (2.55-3.65) 3.89 (3.25-4.56) 4.54 (3.82-5.29) 5.33 (4.51-6.18) s.00 (5.09-6.91) J 3.84 (3.18-4.57) 4.77 (3.98-5.61) 5.51 (4.62-6.44) 6.46 (5.44-7.49) 7.28 (6.16-8.41) 10 0.484 0.371-0.631) 0.708 (0.543-0.924) 0.864 (0.662-1.13) 1.15 (0.878-1.50)1 1.40 (1.07-1.83) 1.66 (1.28-2.14) I 1.80 (1.40-2.30) Y 2.09 L 2.79 (1.64-2.65) �.18-3.83) 25 0.644 (0.490-0.907) 0.943 (0.718-1.33) 1.15 (0.875-1.62) 1.52 (1.16-2.15) 1.88 (1.44-2.66) 2.23 (1.72-3.13) 2.42 (1.89-3.39) 2.47 (1.95-3.10) i 2.84 (2.26-3.52) 3.25 (2.61-3.98) 3.43 (2.78-4.18) i 3.58 (2.91-4.35) 4.08 (3.34-4.91) � 4.50 (3.70-5.38) 5.50 (4.56-6.50) 6.30 (5.26-7.40) 7.36 (6.18-8.58) 8.31 (7.00-9.63) 3.20 (2.50-4.29) 3.60 (2.83-4.74) 4.05 (3.20-5.22) 4.24 (3.36-5.43 4.41 (3.51-5.61) 50 0.788 (0.580-1.12) 1.15 (0.850-1.63) 1.41 (1.04-1.99) 1.86 (1.37-2.64) 2.31 (1.71-3.29) 2.76 (2.06-3.89) 3.01 (2.26-4.21) 3.43 (2.59-4.73) 3.85 (2.92-5.20) 4.26 (3.26-5.66) 4.73 3.64-6.16) 4.93 (3.81-6.37) 5.10 (3.96-6.56) 4.96 �I 5.68 (3.96-6.20) (4.43-7.18) 5.42 (4.33-6.70) 6.50 (5.22-7.89) 7.38 (5.96-8.88) 8.57 (6.95-10.2) 9.65 (7.85-11.4) 6.15 4.81-7.71) 7.26 5.73-8.95) 8.19 6.49-10.0) 9.47 (7.54-11 5) 100 0.949 (0.675-1.38) 1.39 (0.989-2.02) 1.70 (1.20-2.46 2.25 (1.60-3.26) 2.81 (2.00-4.09) y 3.37 (2.42-4.85) 3.68 (2.66-5.27) 1 4.16 (3.04-5.87) 1 4.57 (3.35-6.32) i 4.99 (3.69-6.78) 5.45 (4.06-7.28) 5.66 (4.24-7.50) r 5.84 (4.39-7.69) 200 1.13 (0.772-1.69) 1.66 (1.13-2.47) 2.02 (1.38-3.02) 2.68 (1.83-4.00) 3.37 (2.30-5.04) 4.06 (2.80-6.00) 4.44 (3.09-6.53) 4.99 (3.50-7.23) 5.37 (3.79-7.62) 5.79 (4.12-8.09) 6.23 (4.47-8.55) 6.45 4.65-8.78 6.64 (4.81-8.98) 6.42 (4.86-8.32)_i 6.90 (5.23-8.85) 8.03 (6.14-10.1) 9.00 (6.92-11.2) 10.3 (7.99-12.8) 10.6 11.6 (8.50-12.8) (8.99-14.2 7.21 (5.25-9.60) 7.67 (5.61-10.1) 8.81 (6.49-11.4) 9.80 (7.26-12.6) 11.2 (8.34-14.2) 12.5 (9.35-15.8) 500 1.40 (0.919-2.15) 2.05 (1.34-3.14) 2.50 (1.64-3.84) 3.32 (2.18-5.09) 4.20 (2.76-6.46) 5.09 (3.38-7.72) 5.60 (3.74-8.43) 6.24 (4.20-9.26) 6.54 (4.44-9.53) 6.95 (4.76-9.96) 7.35 (5.07-10.3) 7.58 (5.27-10.6) 7.78 (5.43-10.8) 8.30 (5.83-11.3) 8.72 (6.15-11.8) 9.83 (7.00-13.1) 10.8 (7.76-14.3) 12.3 (8.85-16.0) 13.7 (9.87-17.7) 1000 11.63 (1.03-2.50) 2.38 (1.51-3.65) 2.90 (1.84-4.46) 3.86 (2.44-5.92) 4.91 (3.11-7.53) 5.96 (3.81-9.02) 6.57 (4.22-9.86) 7.28 (4.74-10.8) 7.51 (4.93-11.0) 7.90 (5.25-11.4) 8.25 (5.53-11.7) 8.49 (5.73-12.0) 8.69 (5.89-12.2). 9.16 (6.27-12.7) 9.54 (6.56-13.1) 10.6 (7.38-14.3). 11.6 (8.14-15.6) [13.1 (9.23-17.4) 14.5 (10.3-19.1) 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 a upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAAAtIas 14 document for more information. Back to Top PF graphical Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A PD -based depth -duration -frequency 'DDIN curves Latitude: 40.4187 pr Longitude: -104.9269° c E ,E 6 LA 14 12 5 10 25 50 100 Zoo NOAA Atlas 1.4F Volume 6a'Ver•sion 2 ra -a -a -a-a 6 6 LA � rn mot- to 500 100 Average recurrence interval (years) Created (GMT): Tue Aug 6 14:25:30 2+0.24 Back to Top Maps & aerials Small scale terrain Averse recurrence interval (years) 2 cad 10 5 - 0 10!0! 200 5500 1000 Duration 5 -min — 2 -day 10 -man — 3 -day 15-rnan — 4 -day 30 -min 7 -day 6 0 -ruin 10 -day 2-n r — 20 -day 30 -clay 6 -ti r — 45 -day 12 -hr — 60 -clay 24 -hr Docusign Envelope ID: A01161A0-55CC- 47BE-BD3B-2BB2D135340A '1{ r—_ i • i ' Vile Id Co unty. Rd 58 3km 2mi fi j' .'. • — !tb. f ,ac' ate1. 0:_ • 1 1 L -a Large scale map Large scale terrain r— - R Sma rase} az no% f— i 1" 2j # Denver Large scale aerial Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A USDA United States Department of Agriculture ACS 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 Iron Mountain Substation October 17, 2024 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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. Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 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 4 Aquolls and Aquepts, flooded 13 15 Colby loam, 1 to 3 percent slopes 14 16 Colby loam, 3 to 5 percent slopes 16 32 Kim loam, 1 to 3 percent slopes 17 79 Weld loam, 1 to 3 percent slopes 18 82 —Wiley -Colby complex, 1 to 3 percent slopes 20 References 22 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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. Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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. Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 40° 25' 23" N ti 3 ti 40° 24' 47 N 104° 55' 55" JV 505800 505900 506000 i Custom Soil Resource Report Soil Map 506100 506200 506300 506400 506500 104° 55' 20" W Soil Map may not be valid at this scale. 104° 55' 55" W 505800 505900 506000 506100 Map Scale: 1:5,380 if printed on A portrait (8.5" x 11") sheet. Meters 0 50 100 200 300 506200 506300 Feet 0 250 500 1000 1500 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 506400 506500 104° 55' 20" W ti 4 ti 40° 25' 23" N 40° 24' 47' N 9 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 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 23, Aug 29, 2024 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. Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 4 Aquolls and Aquepts, flooded 8.0 5.5% 15 Colby slopes loam, 1 to 3 percent 2.1 1.4% 16 Colby slopes loam, 3 to 5 percent 22.4 15.3% 32 Kim loam, 1 to 3 percent slopes 6.2 4.2% 79 Weld slopes loam, 1 to 3 percent 36.7 25.1% 82 Wiley -Colby complex, percent slopes 1 to 3 70.8 48.4`)/0 Totals for Area of Interest 146.2 100.0% 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report 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, 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. Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Weld County, Colorado, Southern Part 4—Aquolls and Aquepts, flooded Map Unit Setting National map unit symbol: 3621 Elevation: 3,600 to 4,700 feet Mean annual precipitation: 12 to 16 inches Mean annual air temperature: 50 to 55 degrees F Frost -free period: 100 to 165 days Farmland classification: Prime farmland if drained and either protected from flooding or not frequently flooded during the growing season Map Unit Composition Aquolls and similar soils: 55 percent Aquepts, flooded, and similar soils: 25 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Aquolls Setting Landform: Depressions, plains, drainageways Down -slope shape: Linear Across -slope shape: Linear Parent material: Recent alluvium Typical profile H1 - 0 to 8 inches: variable H2 - 8 to 60 inches: stratified sandy loam to clay Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Poorly drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 6.00 in/hr) Depth to water table: About 6 to 36 inches Frequency of flooding: Frequent Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Moderately saline to strongly saline (8.0 to 16.0 mmhos/cm) Sodium adsorption ratio, maximum: 5.0 Available water supply, 0 to 60 inches: Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated). 6w Land capability classification (nonirrigated): 6w Hydrologic Soil Group: D Ecological site: R067BY035CO - Salt Meadow Hydric soil rating: Yes Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Description of Aquepts, Flooded Setting Landform: Stream terraces Down -slope shape: Linear Across -slope shape: Linear Parent material: Recent alluvium Typical profile H1 - 0 to 8 inches: variable H2 - 8 to 60 inches: stratified sandy loam to clay Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Poorly drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately low to high (0.06 to 6.00 in/hr) Depth to water table: About 6 to 36 inches Frequency of flooding: Frequent Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Moderately saline to strongly saline (8.0 to 16.0 mmhos/cm) Sodium adsorption ratio, maximum: 5.0 Available water supply, 0 to 60 inches: Low (about 4.7 inches) Interpretive groups Land capability classification (irrigated): 6w Land capability classification (nonirrigated): 6w Hydrologic Soil Group: D Ecological site: R067BY038CO - Wet Meadow Hydric soil rating: Yes Minor Components Thedalund Percent of map unit: 10 percent Hydric soil rating: No Haverson Percent of map unit: 10 percent Hydric soil rating: No 15 —Colby loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 361q Elevation: 4,850 to 5,050 feet Mean annual precipitation: 12 to 16 inches 14 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Mean annual air temperature: 48 to 50 degrees F Frost -free period: 135 to 155 days Farmland classification: Prime farmland if irrigated Map Unit Composition Colby and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Colby Setting Down -slope shape: Linear Across -slope shape: Linear Parent material: Calcareous eolian deposits Typical profile H1 - 0 to 7 inches: loam H2 - 7 to 60 inches: silt 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 Available water supply, 0 to 60 inches: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Minor Components Wiley Percent of map unit: 9 Hydric soil rating: No Keith Percent of map unit: 6 Hydric soil rating: No percent percent Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report 16 —Colby loam, 3 to 5 percent slopes Map Unit Setting National map unit symbol: 361r Elevation: 4,850 to 5,050 feet Mean annual precipitation: 12 to 16 inches Mean annual air temperature: 48 to 50 degrees F Frost -free period: 135 to 155 days Farmland classification: Farmland of statewide importance Map Unit Composition Colby and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Colby Setting Landform: Hills, ridges Down -slope shape: Linear Across -slope shape: Linear Parent material: Calcareous eolian deposits Typical profile H? - 0 to 7 inches: loam H2 - 7 to 60 inches: silt loam Properties and qualities Slope: 3 to 5 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 Available water supply, 0 to 60 inches: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Minor Components Wiley Percent of map unit: 8 Hydric soil rating: No Keith Percent of map unit: 7 Hydric soil rating: No percent percent 32 Kim loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 362b Elevation: 4,900 to 5,250 feet Mean annual precipitation: 13 to 17 inches Mean annual air temperature: 46 to 52 degrees F Frost -free period: 125 to 150 days Farmland classification: Prime farmland if irrigated Map Unit Composition Kim and similar soils: 90 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Kim Setting Landform: Plains, alluvial fans Down -slope shape: Linear Across -slope shape: Linear Parent material: Mixed eolian deposits derived from sedimentary rock Typical profile H1 - 0 to 12 inches: loam H2 - 12 to 40 inches: loam H3 - 40 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: 15 percent Available water supply, 0 to 60 inches: Moderate (about 9.0 inches) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Minor Components Otero Percent of map unit: 10 percent Hydric soil rating: No 79 Weld loam, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 2x0hw Elevation: 3,600 to 5,750 feet Mean annual precipitation: 12 to 17 inches Mean annual air temperature: 46 to 54 degrees F Frost -free period: 115 to 155 days Farmland classification: Prime farmland if irrigated Map Unit Composition Weld and similar soils: 80 percent Minor components: 20 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Weld Setting Landform: I me rf l uves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Linear Across -slope shape: Linear Parent material: Calcareous loess Typical profile Ap - 0 to 8 inches: loam Bt1 - 8 to 12 inches: clay Bt2 - 12 to 15 inches: clay loam Btk - 15 to 28 inches: loam Bk - 28 to 60 inches: silt loam C - 60 to 80 inches: silt loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Runoff class: Medium Capacity of the most limiting layer to transmit water (Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 14 percent Maximum salinity: Nonsaline to very slightly saline (0.1 to 2.0 mmhos/cm) Sodium adsorption ratio, maximum: 5.0 Available water supply, 0 to 60 inches: High (about 11.3 inches) Interpretive groups Land capability classification (irrigated): 2e Land capability classification (nonirrigated): 3c Hydrologic Soil Group: C Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Minor Components Adena Percent of map unit: 8 percent Landform: I me rf l uves Landform position (two-dimensional): Shoulder Landform position (three-dimensional): Interfluve Down -slope shape: Convex Across -slope shape: Convex Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Colby Percent of map unit: 7 percent Landform: Hillslopes Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down -slope shape: Convex Across -slope shape: Convex Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Keith Percent of map unit: 3 percent Landform: Imerfluves Landform position (two-dimensional): Summit Landform position (three-dimensional): Interfluve Down -slope shape: Linear Across -slope shape: Linear Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Baca Percent of map unit: 2 percent Landform: Imerfluves Landform position (two-dimensional): Summit, shoulder Landform position (three-dimensional): Interfluve Down -slope shape: Convex, linear Across -slope shape: Convex, linear 19 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No 82 —Wiley -Colby complex, 1 to 3 percent slopes Map Unit Setting National map unit symbol: 3643 Elevation: 4,850 to 5,000 feet Mean annual precipitation: 12 to 16 inches Mean annual air temperature: 48 to 54 degrees F Frost -free period: 135 to 170 days Farmland classification: Prime farmland if irrigated Map Unit Composition Wiley and similar soils: 60 percent Colby and similar soils: 30 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Wiley Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Calcareous eolian deposits Typical profile H1 - 0 to 11 inches: silt loam H2 - 11 to 60 inches: silty clay loam H3 - 60 to 64 inches: silty clay 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 (0.60 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: High (about 11.7 inches) Interpretive groups Land capability classification (irrigated): 2e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY002CO - Loamy Plains 20 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Custom Soil Resource Report Hydric soil rating: No Description of Colby Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Calcareous eolian deposits Typical profile H? - 0 to 7 inches: loam H2 - 7 to 60 inches: silt 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 Available water supply, 0 to 60 inches: High (about 10.6 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Ecological site: R067BY002CO - Loamy Plains Hydric soil rating: No Minor Components Heldt Percent of map unit: 4 percent Hydric soil rating: No Weld Percent of map unit: 4 percent Hydric soil rating: No Keith Percent of map unit: 2 percent Hydric soil rating: No Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 142 p2_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=stelprdb 1043084 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 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 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Appendix B Rational Method Modeling Results Iron Mountain Substation Drainage Report Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Project Description File Name 24085-IronMtn10.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method Modified Rational Time of Concentration (TOC) Method FAA Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On 00:00:00 End Analysis On 00:00:00 Start Reporting On 00:00:00 Antecedent Dry Days 0 Runoff (Dry Weather) Time Step 0 01:00:00 Runoff (Wet Weather) Time Step 0 00:05:00 Reporting Time Step 0 00:05:00 Routing Time Step 30 Number of Elements Qty Rain Gages 0 Subbasins 7 Nodes 11 Junctions 8 Outfalls 2 Flow Diversions 0 Inlets 0 Storage Nodes 1 Links 14 Channels 3 Pipes 5 Pumps 0 Orifices 5 Weirs 1 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details Return Period 10 year(s) 0:00:00 0:00:00 0:00:00 days days hh:mm:ss days hh:mm:ss days hh:mm:ss seconds Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin Summary SN Subbasin Area Weighted Average Flow ID Runoff Slope Length Coefficient (ac) Total Total Total Peak Rainfall Runoff Runoff Runoff Volume (in) (in) (ac -in) Time of Concentration (cfs) (days hh:mm:ss) 1 Ex 2 Ex -OS 3 OS -East 4 OS -West 5 P -East 6 P -West 7 Yard 5.97 10.41 6.41 4.00 2.07 1.32 2.58 0.1700 0.1700 0.1700 0.1700 0.1700 0.1900 0.4500 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 1.5000 500.00 500.00 500.00 500.00 100.00 100.00 100.00 1.41 1.41 1.41 1.41 1.41 1.41 1.41 0.24 0.24 0.24 0.24 0.24 0.27 0.64 1.43 2.50 1.54 0.96 0.50 0.35 1.64 1.43 2.50 1.54 0.96 0.50 0.35 1.64 0 00:26:07 0 00:20:47 0 00:26:07 0 00:26:07 0 00:11:41 0 00:11:28 0 00:10:15 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Node Summary SN Element ID Element Type Invert Elevation (ft) Ground/Rim (Max) Elevation (ft) Initial Water Elevation (ft) Surcharge Ponded Peak Elevation Area Inflow Max HGL Elevation Attained (ft) (ftz) (cfs) (ft) Max Surcharge Depth Attained (ft) 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwa IeO ut 9 Out -Ex 10 Out -P 11 EDB Junction Junction Junction Junction Junction Junction Junction Junction O utfa I I O utfa I I Storage Node 4913.70 4914.64 4913.00 4923.20 4916.92 4916.76 4923.20 4921.50 4913.00 4913.00 4917.50 4915.70 4916.64 4914.00 4924.68 4920.00 4917.76 4924.68 4921.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4921.00 0.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.03 2.03 2.03 1.54 0.05 0.05 0.96 0.97 3.93 3.39 1.64 4914.13 4915.02 4913.73 4923.46 4917.01 4916.85 4923.45 4921.75 4913.00 4914.00 4918.91 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Link Summary SN Element Element From ID Type (Inlet) Node To (Outlet) Node Length Inlet Outlet Invert Invert Elevation Elevation (ft) (ft) (ft) Average Diameter or Manning's Peak Design Flow Peak Flow/ Peak Flow Pi Slope Height Roughness Flow Capacity Design Flow Velocity Ratio (%) (in) (cfs) (cfs) (ft/sec) 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 6 Swale -E 7 Swale -E2 8 Swale -W 9 Orifice -01 10 Orifice -02 11 Orifice -03 12 Orifice -04 13 Orifice -05 14 Weir -01 Pipe Pipe Pipe Pipe Pipe Channel Channel Channel Orifice Orifice Orifice Orifice Orifice Weir DWCulvetln OutletStructure EastSwale2Out PondOut WestSwaleOut EastSwaleln DWCulvertOut WestSwaleln EDB EDB EDB EDB EDB EDB DWCulvertOut PondOut Out -P Out -P Out -P DWCulvetln EastSwale2Out WestSwaleOut OutletStructure OutletStructure OutletStructure OutletStructure OutletStructure OutletStructure 46.80 30.93 46.29 190.55 527.71 703.50 99.39 341.00 4914.64 4916.92 0.00 0.00 0.00 4923.20 4913.70 4923.20 4917.50 4917.50 4917.50 4917.50 4917.50 4917.50 4913.70 4916.76 4914.00 4914.00 4914.00 4914.64 4913.30 4921.50 4916.92 4916.92 4916.92 4916.92 4916.92 4916.92 2.0100 0.5200 -10615.6800 -2578.8500 -931.1900 1.2200 0.4000 0.5000 15.000 15.000 0.000 0.000 0.000 18.000 18.000 18.000 0.630 0.750 0.750 0.750 0.750 0.0120 0.0120 0.0150 0.0150 0.0150 0.0270 0.0320 0.0270 2.03 0.05 2.03 0.05 0.97 1.56 2.03 0.97 0.01 0.02 0.01 0.01 0.00 0.00 9.92 5.03 0.00 0.00 0.00 64.61 31.35 41.35 0.20 0.01 0.01 0.01 0.02 0.02 0.06 0.02 6.35 1.30 0.00 0.00 0.00 3.01 1.29 1.77 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin Hydrology Subbasin : Ex Input Data Area (ac) 5.97 Weighted Runoff Coefficient 0.17 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 5.97 0.17 Composite Area & Weighted Runoff Coeff. Time of Concentration TOC Method : FAA Sheet Flow Equation : Tc = ((0.03 * (1.1 - C)) * (Kf^0.5) * (Sf^-0.333))) Where : Tc = Time of Concentration (hr) C = Runoff Coefficient Lf = Flow Length (ft) Sf = Slope (%) User -Defined TOC override (minutes): 26.13 Subbasin Runoff Results 5.97 0.17 Total Rainfall (in) 1.41 Total Runoff (in) 0.24 Peak Runoff (cfs) 1.43 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.17 Time of Concentration (days hh:mm:ss) 0 00:26:08 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : Ex Runoff Hydrograph 1.45 1.4 1.35 1.3 1.25 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 0.8 U — 0.75 O 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : Ex -OS Input Data Area (ac) 10.41 Weighted Runoff Coefficient 0.17 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 10.41 0.17 Composite Area & Weighted Runoff Coeff. 10.41 0.17 Time of Concentration User -Defined TOC override (minutes): 20.79 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.24 Peak Runoff (cfs) 2.5 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.17 Time of Concentration (days hh:mm:ss) 0 00:20:47 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : Ex -OS Runoff Hydrograph 2.6 2.5 2.4 2.3 2.2 2.1 2 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : OS -East Input Data Area (ac) 6.41 Weighted Runoff Coefficient 0.17 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 6.41 0.17 Composite Area & Weighted Runoff Coeff. 6.41 0.17 Time of Concentration User -Defined TOC override (minutes): 26.13 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.24 Peak Runoff (cfs) 1.54 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.17 Time of Concentration (days hh:mm:ss) 0 00:26:08 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : OS -East Runoff Hydrograph 1.7 _ 1.6-_ 1.5- 1.4- 1.3- 1.2� 1.1- 1- 0.9- ....... 0.8- r 0.7- 0.6- 0.5- 0.4- 0.3- 0.24 0.1- 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : OS -West Input Data Area (ac) 4 Weighted Runoff Coefficient 0.17 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 4 0.17 Composite Area & Weighted Runoff Coeff. 4 0.17 Time of Concentration User -Defined TOC override (minutes): 26.13 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.24 Peak Runoff (cfs) 0.96 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.17 Time of Concentration (days hh:mm:ss) 0 00:26:08 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : OS -West Runoff Hydrograph Runoff (cfs) 1.05 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : P -East Input Data Area (ac) 2.07 Weighted Runoff Coefficient 0.17 Average Slope (%) 3 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. - 2.07 - 0.17 Composite Area & Weighted Runoff Coeff. 2.07 0.17 Time of Concentration User -Defined TOC override (minutes): 11.69 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.24 Peak Runoff (cfs) 0.5 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.17 Time of Concentration (days hh:mm:ss) 0 00:11:41 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : P -East Runoff Hydrograph 0.52 4- U O 0.5 That 0.48 - 0.46 0.44 - 0.42- 0.4- 0.38 0.36- 0.34- 0.32 - 0.3 - 0.28 0.26 0.24 0.22 0.2- 0.18- 0.16- 0.14-- 0.12-- 0.1-- 0.08- - 0.06- 0.04-- 0.02- - 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : P -West Input Data Area (ac) 1.32 Weighted Runoff Coefficient 0.19 Average Slope (%) 3 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. - 1.32 - 0.19 Composite Area & Weighted Runoff Coeff. 1.32 0.19 Time of Concentration User -Defined TOC override (minutes): 11.48 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.27 Peak Runoff (cfs) 0.35 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.19 Time of Concentration (days hh:mm:ss) 0 00:11:29 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : P -West Runoff Hydrograph 0.38 0.36-L 0.34 - 0.32- 0.3- 0.28- 0.26- 0.24- ,_, 0.22- U) .1 0.2 - mg 0.18- rY 0.16- 0.14- 0.12i 0.1- 0.08 - 0.06 - 0.04 - 0.02 - 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin : Yard Input Data Area (ac) 2.58 Weighted Runoff Coefficient 0.45 Average Slope (%) 1.5 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 2.58 0.45 Composite Area & Weighted Runoff Coeff. 2.58 0.45 Time of Concentration User -Defined TOC override (minutes): 10.25 Subbasin Runoff Results Total Rainfall (in) 1.41 Total Runoff (in) 0.64 Peak Runoff (cfs) 1.64 Rainfall Intensity 1.41 Weighted Runoff Coefficient 0.45 Time of Concentration (days hh:mm:ss) 0 00:10:15 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Subbasin :Yard Runoff Hydrograph 1.8 1.7- 1.6-� 1.5- 1.4- 1.3- 1.2- 1.1- 0 1- U `. O 0.9- c � 0.8 0.7- 0.6- 0.5- 0.4 - 0.3- 0.2- 0.1- 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Junction Input SN Element ID Invert Ground/Rim Elevation (Max) Elevation (ft) (ft) Ground/Rim (Max) Offset (ft) Initial Water Elevation (ft) Initial Water Depth (ft) Surcharge Elevation (ft) Surcharge Ponded Minimur Depth Area Pip COVE (ft) (ft2) (ir 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwaleOut 4913.70 4914.64 4913.00 4923.20 4916.92 4916.76 4923.20 4921.50 4915.70 4916.64 4914.00 4924.68 4920.00 4917.76 4924.68 4921.50 2.00 2.00 1.00 1.48 3.08 1.00 1.48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 4913.70 - 4914.64 - 4913.00 - 4923.20 - 4916.92 - 4916.76 -4923.20 - 4921.50 6.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 -4909.70 - 4910.64 -4908.00 - 4918.68 - 4914.00 - 4911.76 -4918.68 - 4915.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Junction Results SN Element ID Peak Inflow Peak Lateral Inflow Max HGL Elevation Attained (cfs) (cfs) (ft) Max HGL Max Depth Surcharge Attained Depth Attained (ft) (ft) Min Freeboard Attained (ft) Average HGL Elevation Attained (ft) Average HGL Depth Attained Time Max HC Occurrent (ft) (days hh:mr 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwaleOut 2.03 2.03 2.03 1.54 0.05 0.05 0.96 0.97 0.00 0.50 0.00 1.54 0.00 0.00 0.96 0.00 4914.13 4915.02 4913.73 4923.46 4917.01 4916.85 4923.45 4921.75 0.43 0.38 0.73 0.26 0.09 0.09 0.25 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.57 1.62 1.07 1.24 2.99 1.16 1.25 1.25 4913.70 4914.64 4913.30 4923.20 4916.95 4916.79 4923.20 4921.50 0.00 0.00 0.30 0.00 0.03 0.03 0.00 0.00 0 01:( 0 01:( 0 01:( 0 00:: 0 01:] 0 01:9 0 00:: 0 01:( Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape ID Invert Invert Invert Invert Drop Slope Elevation Offset Elevation Offset (ft) (ft) (ft) (ft) (ft) (ft) (%) Height Width Manning's Entr Roughness L (ft) (ft) 1 Swale -E 703.50 4923.20 0.00 4914.64 0.00 8.56 1.2200 Trapezoidal 1.500 14.000 0.0270 0. 2 Swale -E2 99.39 4913.70 0.00 4913.30 0.30 0.40 0.4000 Trapezoidal 1.500 14.000 0.0320 0. 3 Swale -W 341.00 4923.20 0.00 4921.50 0.00 1.70 0.5000 Trapezoidal 1.500 14.000 0.0270 0. Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time f ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged N Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 Swale -E 1.56 0 01:01 2 Swale -E2 2.03 0 01:00 3 Swale -W 0.97 0 01:01 64.61 31.35 41.35 0.02 0.06 0.02 3.01 1.29 1.77 3.90 1.28 3.21 0.26 0.43 0.25 0.17 0.28 0.17 0.00 0.00 0.00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Pipe Input SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pir ID Invert Invert Invert Invert Drop Slope Shape Diameter or Wid1 Elevation Offset Elevation Offset Height (ft) (ft) (ft) (ft) (ft) (ft) (%) (in) (ii 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 46.80 30.93 46.29 190.55 527.71 4914.64 4916.92 0.00 0.00 0.00 0.00 0.00 - 4913.00 - 4916.76 - 4921.50 4913.70 4916.76 4914.00 4914.00 4914.00 0.00 0.00 1.00 1.00 1.00 0.94 0.16 - 4914.00 - 4914.00 - 4914.00 2.0100 CIRCULAR 0.5200 CIRCULAR -10615.6800 Dummy -2578.8500 Dummy -931.1900 Dummy 15.000 15.000 0.000 0.000 0.000 15.0C 15.0C 0.0C 0.0C 0.0C Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event No. of Barrels 1 1 1 1 1 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Tim ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharge Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 2.03 0.05 2.03 0.05 0.97 0 01:00 0 01:10 0 01:00 0 01:10 0 01:01 9.92 5.03 0.00 0.00 0.00 0.20 0.01 0.01 0.01 0.02 6.35 1.30 0.00 0.00 0.00 0.12 0.40 0.38 0.09 0.09 0.09 0.25 0.31 0.07 0.07 0.07 0.17 0.0 0.0 0.0 0.0 0.0 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Storage Nodes Storage Node : EDB Input Data Invert Elevation (ft) 4917.50 Max (Rim) Elevation (ft) 4921.00 Max (Rim) Offset (ft) 3.50 Initial Water Elevation (ft) 0.00 Initial Water Depth (ft) -4917.50 Ponded Area (ft2) 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : EDB-1 Stage Storage Storage Area Volume (ft) (ft2) (ft3) 0 10 0 0.5 2104.26 528.57 1 6288.47 2626.75 1.5 9805.89 6650.34 2 10923.95 11832.8 2.5 12066.32 17580.37 3 13237.42 23906.31 3.5 14437.22 30824.97 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event is a as 4s N 0 3.5 - 3.4 ' 3.3 --T - I 3.2 = -I - I 3.1 --J 3= 2.9 -- - I 2.8 --1 2.7 --1 2.6 II 2.5 -- _ I 2.4 _ I 2.3 _ 2.2 2.1 --1 2 --1 _ I 1.9 - 1.8 --, 1.7 =-i 1.61' 1.5_; 1.4 --1 1.3 i 1.2 ' 1.1 1I 0.9 I 0.8 _ 0.7 - - 0.6 i 0.5 -' OA_ 0.3 _ -t 0.2 I 0.1 0 Storage Area Volume Curves Storage Volume (ft3) 5,000 10,000 15,000 t 20,000 25,000 r I r 1 L r I I_ I L r 1 L r I L r I I- 1 L I I I I I I I I I I I I 1 I I I I I 1 I I I I r I I- I L r I I - r I L Storage Area (ft2) Storage Area Storage Volume r 1 1- 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 10 -Year 1 -Hour Storm Event Storage Node : EDB (continued) Outflow Weirs SN Element Weir Flap ID Type Gate Crest Elevation (ft) Crest Offset (ft) Length Weir Total Disci - Height Coeffi (ft) (ft) Outflow Orifices 1 Weir -01 Rectangular No SN Element Orifice ID Type Orifice Shape 4919.50 2.00 Flap Gate Circular Orifice Diameter (in) 4.00 Rectangular Orifice Height (in) 1.00 Rectangular Orifice Width (in) O li Elev 1 Orifice -01 2 Orifice -02 3 Orifice -03 4 Orifice -04 5 Orifice -05 Output Summary Results Side Side Side Side Side CIRCULAR No CIRCULAR No CIRCULAR No CIRCULAR No CIRCULAR No Peak Inflow (cfs) 1.64 Peak Lateral Inflow (cfs) 1.64 Peak Outflow (cfs) 0.05 Peak Exfiltration Flow Rate (cfm) 0 Max HGL Elevation Attained (ft) 4918.91 Max HGL Depth Attained (ft) 1.41 Average HGL Elevation Attained (ft) 4917.92 Average HGL Depth Attained (ft) 0.42 Time of Max HGL Occurrence (days hh:mm) 0 01:10 Total Exfiltration Volume (1000-fe) 0 Total Flooded Volume (ac -in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0 0.63 0.75 0.75 0.75 0.75 49] 49] 49] 49] 49] Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Project Description File Name 24085-IronMtn100.SPF Project Options Flow Units CFS Elevation Type Elevation Hydrology Method Modified Rational Time of Concentration (TOC) Method FAA Link Routing Method Kinematic Wave Enable Overflow Ponding at Nodes YES Skip Steady State Analysis Time Periods YES Analysis Options Start Analysis On 00:00:00 End Analysis On 00:00:00 Start Reporting On 00:00:00 Antecedent Dry Days 0 Runoff (Dry Weather) Time Step 0 01:00:00 Runoff (Wet Weather) Time Step 0 00:05:00 Reporting Time Step 0 00:05:00 Routing Time Step 30 Number of Elements Qty Rain Gages 0 Subbasins 7 Nodes 11 Junctions 8 Outfalls 2 Flow Diversions 0 Inlets 0 Storage Nodes 1 Links 14 Channels 3 Pipes 5 Pumps 0 Orifices 5 Weirs 1 Outlets 0 Pollutants 0 Land Uses 0 Rainfall Details Return Period 100 year(s) 0:00:00 0:00:00 0:00:00 days days hh:mm:ss days hh:mm:ss days hh:mm:ss seconds Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin Summary SN Subbasin Area Weighted Average Flow ID Runoff Slope Length Coefficient (ac) Total Total Total Peak Rainfall Runoff Runoff Runoff Volume (in) (in) (ac -in) (cfs) Time of Concentration (days hh:mm:ss) 1 Ex 2 Ex -OS 3 OS -East 4 OS -West 5 P -East 6 P -West 7 Yard 5.97 10.41 6.41 4.00 2.07 1.32 2.58 0.3600 0.3600 0.3600 0.3600 0.3600 0.3600 0.5000 3.0000 3.0000 3.0000 3.0000 3.0000 3.0000 1.5000 500.00 500.00 500.00 500.00 100.00 100.00 100.00 2.84 2.84 2.84 2.84 2.84 2.84 2.84 1.02 1.02 1.02 1.02 1.02 1.02 1.42 6.10 10.64 6.55 4.09 2.12 1.35 3.66 6.10 10.64 6.55 4.09 2.12 1.35 3.66 0 00:20:47 0 00:20:47 0 00:20:47 0 00:20:47 0 00:10:00 0 00:10:00 0 00:10:00 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Node Summary SN Element ID Element Type Invert Elevation (ft) Ground/Rim (Max) Elevation (ft) Initial Water Elevation (ft) Surcharge Ponded Peak Elevation Area Inflow Max HGL Elevation Attained (ft) (ftz) (cfs) (ft) Max Surcharge Depth Attained (ft) 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwa IeO ut 9 Out -Ex 10 Out -P 11 EDB Junction Junction Junction Junction Junction Junction Junction Junction O utfa I I O utfa I I Storage Node 4913.70 4914.64 4913.00 4923.20 4916.92 4916.76 4923.20 4921.50 4913.00 4913.00 4917.50 4915.70 4916.64 4914.00 4924.68 4920.00 4917.76 4924.68 4921.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4921.00 0.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 8.67 8.67 8.67 6.55 0.45 0.45 4.09 4.13 16.75 14.19 3.66 4914.61 4915.55 4914.15 4924.70 4917.17 4917.01 4923.73 4922.03 4913.00 4914.00 4919.59 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Link Summary SN Element Element From ID Type (Inlet) Node To (Outlet) Node Length Inlet Outlet Invert Invert Elevation Elevation (ft) (ft) (ft) Average Diameter or Manning's Peak Design Flow Peak Flow/ Peak Flow Pi Slope Height Roughness Flow Capacity Design Flow Velocity Ratio (%) (in) (cfs) (cfs) (ft/sec) 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 6 Swale -E 7 Swale -E2 8 Swale -W 9 Orifice -01 10 Orifice -02 11 Orifice -03 12 Orifice -04 13 Orifice -05 14 Weir -01 Pipe Pipe Pipe Pipe Pipe Channel Channel Channel Orifice Orifice Orifice Orifice Orifice Weir DWCulvetln OutletStructure EastSwale2Out PondOut WestSwaleOut EastSwaleln DWCulvertOut WestSwaleln EDB EDB EDB EDB EDB EDB DWCulvertOut PondOut Out -P Out -P Out -P DWCulvetln EastSwale2Out WestSwaleOut OutletStructure OutletStructure OutletStructure OutletStructure OutletStructure OutletStructure 46.80 30.93 46.29 190.55 527.71 703.50 99.39 341.00 4914.64 4916.92 0.00 0.00 0.00 4923.20 4913.70 4923.20 4917.50 4917.50 4917.50 4917.50 4917.50 4917.50 4913.70 4916.76 4914.00 4914.00 4914.00 4914.64 4913.30 4921.50 4916.92 4916.92 4916.92 4916.92 4916.92 4916.92 2.0100 0.5200 -10615.6800 -2578.8500 -931.1900 1.2200 0.4000 0.5000 15.000 15.000 0.000 0.000 0.000 18.000 18.000 18.000 0.630 0.750 0.750 0.750 0.750 0.0120 0.0120 0.0150 0.0150 0.0150 0.0270 0.0320 0.0270 8.67 0.45 8.67 0.45 4.13 6.64 8.67 4.13 0.02 0.02 0.02 0.01 0.01 0.37 9.92 5.03 0.00 0.00 0.00 64.61 31.35 41.35 0.87 0.09 0.09 0.09 0.10 0.10 0.28 0.10 9.11 2.54 0.00 0.00 0.00 4.84 1.89 2.84 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin Hydrology Subbasin : Ex Input Data Area (ac) 5.97 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 5.97 0.36 Composite Area & Weighted Runoff Coeff. Time of Concentration TOC Method : FAA Sheet Flow Equation : Tc = ((0.03 * (1.1 - C)) * (Kf^0.5) * (Sf^-0.333))) Where : Tc = Time of Concentration (hr) C = Runoff Coefficient Lf = Flow Length (ft) Sf = Slope (%) User -Defined TOC override (minutes): 20.79 Subbasin Runoff Results 5.97 0.36 Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 6.1 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:20:47 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : Ex Runoff Hydrograph 6.5 6� 5.5- 5- 4.5 4 � 3.5- O c 3- r 2.5- 2- 1.5- 0.5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : Ex -OS Input Data Area (ac) 10.41 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 10.41 0.36 Composite Area & Weighted Runoff Coeff. 10.41 0.36 Time of Concentration User -Defined TOC override (minutes): 20.79 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 10.64 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:20:47 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : Ex -OS Runoff Hydrograph 4- U O 11.5 11 10.5 10 9.5 9 8.5 8 7.5 7 6.5 6 5.5 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : OS -East Input Data Area (ac) 6.41 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 6.41 0.36 Composite Area & Weighted Runoff Coeff. 6.41 0.36 Time of Concentration User -Defined TOC override (minutes): 20.79 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 6.55 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:20:47 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : OS -East Runoff Hydrograph 7.5 7- 6.5i 6 5.5 5 4.5 0 4 it c 3.5 tY 3 2.5 2 1.5 0.5 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : OS -West Input Data Area (ac) 4 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 500 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 4 0.36 Composite Area & Weighted Runoff Coeff. 4 0.36 Time of Concentration User -Defined TOC override (minutes): 20.79 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 4.09 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:20:47 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : OS -West Runoff Hydrograph 4- U O 4.4 4.2- 4- 3.8 - 3.6 - 3.4- 3.2- 3- 2.8 - 2.6 - 2.4- 2.2- 2- 1.8- 1.6- 1.4- 1.2- 1- 0.8 - 0.6 - 0.4- 0.2- 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : P -East Input Data Area (ac) 2.07 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 2.07 0.36 Composite Area & Weighted Runoff Coeff. 2.07 0.36 Time of Concentration User -Defined TOC override (minutes): 10 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 2.12 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:10:00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : P -East Runoff Hydrograph 2.3 2.2- 2.1 2- 1.9- 1.8- 1.7- 1.6- 1.5- 1.4- 1.3- 1.2 1.1 - 1 0.9 - 0.8 - 0.7 - 0.6 - 0.5 - 0.4 - 0.3 - 0.2- 0.1 - _P 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 Time (hrs) 85 90 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : P -West Input Data Area (ac) 1.32 Weighted Runoff Coefficient 0.36 Average Slope (%) 3 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 1.32 0.36 Composite Area & Weighted Runoff Coeff. 1.32 0.36 Time of Concentration User -Defined TOC override (minutes): 10 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.02 Peak Runoff (cfs) 1.35 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.36 Time of Concentration (days hh:mm:ss) 0 00:10:00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : P -West Runoff Hydrograph 1.4 1.35-1 1.3- 1.25- 1.2- 1.15- 1.1- 1.05 1- 0.95 0.9 - 0.85 - 0.8- 0.75 - 0.7 0.65 - 0.6 - 0.55 - 0.5 - 0.45-- 0.4 - 0.35 - 0.3 - 0.25 - 0.2- - 0.15-- 0.1-- 0.05-- 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin : Yard Input Data Area (ac) 2.58 Weighted Runoff Coefficient 0.5 Average Slope (%) 1.5 Flow Length (ft) 100 Runoff Coefficient Area Soil Runoff Soil/Surface Description (acres) Group Coeff. 2.58 0.5 Composite Area & Weighted Runoff Coeff. 2.58 0.5 Time of Concentration User -Defined TOC override (minutes): 10 Subbasin Runoff Results Total Rainfall (in) 2.84 Total Runoff (in) 1.42 Peak Runoff (cfs) 3.66 Rainfall Intensity 2.84 Weighted Runoff Coefficient 0.5 Time of Concentration (days hh:mm:ss) 0 00:10:00 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Subbasin :Yard Runoff Hydrograph 4 co U 4_ O C tY 3.8- 3.6-1-1 3.4- 3.2- 3- 2.8- 2.6- 2.4- 2.2- 2 1.8- 1.6 1.4- 1.2- 1 0.8 - 0.6 - 0.4 - 0.2 - 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Time (hrs) Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Junction Input SN Element ID Invert Ground/Rim Elevation (Max) Elevation (ft) (ft) Ground/Rim (Max) Offset (ft) Initial Water Elevation (ft) Initial Water Depth (ft) Surcharge Elevation (ft) Surcharge Ponded Minimur Depth Area Pip COVE (ft) (ft2) (ir 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwaleOut 4913.70 4914.64 4913.00 4923.20 4916.92 4916.76 4923.20 4921.50 4915.70 4916.64 4914.00 4924.68 4920.00 4917.76 4924.68 4921.50 2.00 2.00 1.00 1.48 3.08 1.00 1.48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 - 4913.70 - 4914.64 - 4913.00 - 4923.20 - 4916.92 - 4916.76 -4923.20 - 4921.50 6.00 6.00 6.00 6.00 6.00 6.00 6.00 6.00 -4909.70 - 4910.64 -4908.00 - 4918.68 - 4914.00 - 4911.76 -4918.68 - 4915.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Junction Results SN Element ID Peak Inflow Peak Lateral Inflow Max HGL Elevation Attained (cfs) (cfs) (ft) Max HGL Max Depth Surcharge Attained Depth Attained (ft) (ft) Min Freeboard Attained (ft) Average HGL Elevation Attained (ft) Average HGL Depth Attained Time Max HC Occurrent (ft) (days hh:mr 1 DWCulvertOut 2 DWCulvetln 3 EastSwale2Out 4 EastSwaleln 5 OutletStructure 6 PondOut 7 WestSwaleln 8 WestSwaleOut 8.67 8.67 8.67 6.55 0.45 0.45 4.09 4.13 0.00 2.12 0.00 6.55 0.00 0.00 4.09 0.00 4914.61 4915.55 4914.15 4924.70 4917.17 4917.01 4923.73 4922.03 0.91 0.91 1.15 1.50 0.25 0.25 0.53 0.53 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.09 1.09 0.65 0.00 2.83 1.00 0.97 0.97 4913.71 4914.65 4913.31 4923.21 4916.98 4916.82 4923.20 4921.51 0.01 0.01 0.31 0.01 0.06 0.06 0.00 0.01 0 01:( 0 01:( 0 01:( 0 00:: 0 01:( 0 01:( 0 00:: 0 01:C Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Channel Input SN Element Length Inlet Inlet Outlet Outlet Total Average Shape ID Invert Invert Invert Invert Drop Slope Elevation Offset Elevation Offset (ft) (ft) (ft) (ft) (ft) (ft) (%) Height Width Manning's Entr Roughness L (ft) (ft) 1 Swale -E 703.50 4923.20 0.00 4914.64 0.00 8.56 1.2200 Trapezoidal 1.500 14.000 0.0270 0. 2 Swale -E2 99.39 4913.70 0.00 4913.30 0.30 0.40 0.4000 Trapezoidal 1.500 14.000 0.0320 0. 3 Swale -W 341.00 4923.20 0.00 4921.50 0.00 1.70 0.5000 Trapezoidal 1.500 14.000 0.0270 0. Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Channel Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Time f ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharged N Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min) 1 Swale -E 6.64 0 01:01 2 Swale -E2 8.67 0 01:00 3 Swale -W 4.13 0 01:00 64.61 31.35 41.35 0.10 0.28 0.10 4.84 1.89 2.84 2.42 0.88 2.00 0.53 0.85 0.53 0.35 0.57 0.35 0.00 0.00 0.00 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Pipe Input SN Element ID Length Inlet Invert Elevation (ft) (ft) Inlet Invert Offset (ft) Outlet Invert Elevation (ft) Outlet I nvert Offset (ft) Total Drop (ft) Average Pipe Slope Shape (%) Pipe Pir Diameter or Wid1 Height (in) (ii 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 46.80 30.93 46.29 190.55 527.71 4914.64 4916.92 0.00 0.00 0.00 0.00 0.00 - 4913.00 - 4916.76 - 4921.50 4913.70 4916.76 4914.00 4914.00 4914.00 0.00 0.00 1.00 1.00 1.00 0.94 0.16 - 4914.00 - 4914.00 - 4914.00 2.0100 CIRCULAR 0.5200 CIRCULAR -10615.6800 Dummy -2578.8500 Dummy -931.1900 Dummy 15.000 15.000 0.000 0.000 0.000 15.0C 15.0C 0.0C 0.0C 0.0C Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event No. of Barrels 1 1 1 1 1 Docusign Envelope ID: AO1161A0-55CC-47BE-BD3B-2BB2D13534OA 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Pipe Results SN Element Peak Time of Design Flow Peak Flow/ Peak Flow Travel Peak Flow Peak Flow Total Tim ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/ Surcharge Occurrence Ratio Total Depth Ratio (cfs) (days hh:mm) (cfs) (ft/sec) (min) (ft) (min 1 Culvert-DW 2 Culvert -Pond 3 East -Out 4 Pond -Out 5 West -Out 8.67 0.45 8.67 0.45 4.13 0 01:00 0 01:09 0 01:00 0 01:09 0 01:00 9.92 5.03 0.00 0.00 0.00 0.87 0.09 0.09 0.09 0.10 9.11 2.54 0.00 0.00 0.00 0.09 0.20 0.91 0.25 0.25 0.25 0.53 0.72 0.20 0.20 0.20 0.35 0.0 0.0 0.0 0.0 0.0 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Storage Nodes Storage Node : EDB Input Data Invert Elevation (ft) 4917.50 Max (Rim) Elevation (ft) 4921.00 Max (Rim) Offset (ft) 3.50 Initial Water Elevation (ft) 0.00 Initial Water Depth (ft) -4917.50 Ponded Area (ft2) 0.00 Evaporation Loss 0.00 Storage Area Volume Curves Storage Curve : EDB-1 Stage Storage Storage Area Volume (ft) (ft2) (ft3) 0 10 0 0.5 2104.26 528.57 1 6288.47 2626.75 1.5 9805.89 6650.34 2 10923.95 11832.8 2.5 12066.32 17580.37 3 13237.42 23906.31 3.5 14437.22 30824.97 Docusign Envelope ID: A01161 A0-55CC-47BE-BD3B-2662D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event is a as 4s N 0 3.5 - 3.4 ' 3.3 --T - I 3.2 = -I - I 3.1 --J 3= 2.9 -- - I 2.8 --1 2.7 --1 2.6 II 2.5 -- _ I 2.4 _ I 2.3 _ 2.2 2.1 --1 2 --1 _ I 1.9 - 1.8 --, 1.7 =-i 1.61' 1.5_; 1.4 --1 1.3 i 1.2 ' 1.1 1I 0.9 I 0.8 _ 0.7 - - 0.6 i 0.5 -' OA_ 0.3 _ -t 0.2 I 0.1 0 Storage Area Volume Curves Storage Volume (ft3) 5,000 10,000 15,000 t 20,000 25,000 r I r 1 L r I I_ I L r 1 L r I L r I I- 1 L I I I I I I I I I I I I 1 I I I I I 1 I I I I r I I- I L r I I - r I L Storage Area (ft2) Storage Area Storage Volume r 1 1- 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A 24085 Iron Mountain Substation 100 -Year 1 -Hour Storm Event Storage Node : EDB (continued) Outflow Weirs SN Element Weir Flap ID Type Gate Crest Elevation (ft) Crest Offset (ft) Length Weir Total Disci - Height Coeffi (ft) (ft) Outflow Orifices 1 Weir -01 Rectangular No SN Element Orifice ID Type Orifice Shape 4919.50 2.00 Flap Gate Circular Orifice Diameter (in) 4.00 Rectangular Orifice Height (in) 1.00 Rectangular Orifice Width (in) O li Elev 1 Orifice -01 2 Orifice -02 3 Orifice -03 4 Orifice -04 5 Orifice -05 Output Summary Results Side Side Side Side Side CIRCULAR No CIRCULAR No CIRCULAR No CIRCULAR No CIRCULAR No Peak Inflow (cfs) 3.66 Peak Lateral Inflow (cfs) 3.66 Peak Outflow (cfs) 0.45 Peak Exfiltration Flow Rate (cfm) 0 Max HGL Elevation Attained (ft) 4919.59 Max HGL Depth Attained (ft) 2.09 Average HGL Elevation Attained (ft) 4918.35 Average HGL Depth Attained (ft) 0.85 Time of Max HGL Occurrence (days hh:mm) 0 01:08 Total Exfiltration Volume (1000-fe) 0 Total Flooded Volume (ac -in) 0 Total Time Flooded (min) 0 Total Retention Time (sec) 0 0.63 0.75 0.75 0.75 0.75 49] 49] 49] 49] 49] Docusign Envelope ID: A01161A0-55CC-47BE-BD3B-2BB2D135340A Appendix C Site Maps & Design Drawings Iron Mountain Substation Drainage Report September 8th, 2024 Facility Emergency Action Plan STATE Generation and Transmission Association, Inc. A Touchstone Energy® Cooperative 41)( ioapnaftamarra Iron Mountain Substation (303) 452-6111 September 8th, 2024 1. Name: Tri-State Generation and Transmission Association, Inc. Iron Mountain Substation 2. Location: % Mile North of State Hwy 34 on County Road 15, GPS: 40.4177, -104.9260 3. Emergency Telephone Numbers: Facility Primary: Facility Secondary: Fire District Windsor Severance Fire Rescue Ambulance Service Area Thompson Valley EMS Dispatch Weld County Regional Comm Center Other Chemtrec (Chemical transportation Emergency Center) 4. Agency Notification Non-Emcr envy: Fire Department/District (Windsor Severance Fire Rescue): Ambulance Service Area .(Thompson Valley EMS): Law Enforcement Agency (Windsor Police Dept): Law Enforcement Agency (weld County Sheriff, District 1) Law Enforcement Agency (State Police, Troop 3A): Communication Center Office of Emergency management 5. Surrounding Occupancies & Land Use Surrounding land use is mainly agricultural land with active oil and gas facilities, mixed commercial, and industrial facilities. Soo -230-6180 303-452-+6111 911 N 800-230-6180 303-452-6111 911 a. b. c. d. e. 911 911 911 911 800-424-9300 Phone# 970-686-2626 970-663-6025 970-674-6400 970-356-4015 970-506-4999 970-350-9600 970-304-+6540 Approximately 700' southeast is a residence and associated cattle farm. Approximately 1,4 mile north and northeast are four residences. Approximately 1/2 mile south are two residences. Approximately 1,700' northwest is an O&G facility owned by Derr McGee. Indianhead Estates housing development lies southwest of the intersection of State Highway 34 and County Road 15, approximately 3f mile south of the site. September 8th, 2024 6. Personal Protective Equipment Available: Self -Contained breathing apparatus: Spare compressed breathing air bottles: Boots, gloves, hard hats, and eye protection: 7. Location of Emergency Equipmcnt & Supplies: Spill Cleanup Kits Fire Extinguishers Misc. Emergency Equipment First -Aid Supplies Location Fire Department Fire Department Contractor and NCMC (Frederick) Phone# Vehicles and NCMC (Frederick) 303-452-6111 Vehicles and NCMC (Frederick) 303-452-6111 Vehicles and NCMC (Frederick) 303-452-6111 Vehicles and NCMC (Frederick) 303-452-6111 8. Location & Types of Water Supplies: No permanent water supply is proposed. Bottled water would be provided during construction, and minimal quantities of water for construction and/or dust suppression would be brought in by a water truck if needed. **Never attempt to fight a fire in any Tri-State electrical facility with water without consent and instruction from Tri-State Staff. * * 9. Transportation routes: The substation has yet to be designed. However, access to the substation will be via County Road 15. The route from our Field Facility in Frederick will be: north on Puritan Way to CR 52, the east on CR52 about % mile to the on -ramp of Interstate 25 North, then north 22 miles to exit 257, then east on State Highway 34 for 3.5 miles to County Road 15, then north % mile to the site. The dedicated entrance of the substation will likely be a gate on the east side of the substation accessed directly off Road 15. Do not try to access the substation without Tri-State Staff approval or presence, as the site will be secured by chain link fence. During construction, most materials will be delivered by Tri-State's selected contractors or in Tri-State company vehicles. Following construction, there will not be regular shipments of materials or chemicals to this facility as it is an unmanned electrical substation housing electrical equipment and batteries. Any deliveries will most likely be electrical equipment including breakers, relays, transformers, batteries, etc. Chemicals of interest could be dielectric fluids such as mineral oil, SF6 gas for circuit breakers, and battery acid for battery banks as well as miscellaneous small quantities of chemicals necessary to perform work. September 8th, 2024 xe Lawrie PROSPECT; SHIELDS ip‘ i • Iron Motmtain Substation -Jo nstQv& 4 r rsti elk i k•Ountif Etraerwev Management Deoar"mem O • 1 Colored a"ate Patrol .. zrt . 3 a Recerct,. - - Aorta 'AO,er.i 41.), Greve) es) Evans k 4 Map of Approximate Substation Location on County Road 15. 10. Action Items and Response: **Never enter a substation in an unknown state of operation or energization** If access to a facility is needed, Tri-State Staff must always be present and made aware of the request to ensure all parties safety and compliance to various standards. The dedicated entrance of the substation will be the gate on the east side of the substation accessed directly off Road 15. Do not try to access the substation without Tri-State Staff approval and presence. Our worst -case scenarios are as follows: a. Electrical fire or dielectric fluid/gas release due to electrical equipment damage or malfunction. Tri-State's Substation Maintenance staff would respond to the emergency to de -energize the substation so that maintenance/fire/cleanup crews could make repairs, fight the fire or cleanup as necessary. Never enter an energized facility or a facility in an unknown state of operation or energization. Tri-State Substation Maintenance Staff are available 24/7 to respond to emergencies upon request. b. Battery bank failure causing a release of dilute sulfuric acid (S.G. 1.215, �30%) in the control house. Acid would be contained within control house and Tri-State's Substation Maintenance Staff would respond to the emergency and provide cleanup services within their training. Outside cleanup contractors may also be utilized for larger releases. September e, 2024 c. Electrocution of personnel by energized equipment. Tri-State staff would respond to the emergency by de -energizing the line so that rescue crews could perform actions as necessary. Contractor or Tri-State personnel would call 911 for emergent medical and rescue services. Tri-State linemen are trained in high angle rescue, first aid, and CPR. d. Injury of personnel via impacts of falling or moving equipment, falls, slips, and trips. Contractor or Tri-State personnel would call 911 for emergent medical and rescue services, if necessary. Tri-State linemen are trained in high angle rescue, first aid, and CPR.. 11. Coordination with First Responder Agencies: If requested, EHS representative and first responders will meet to review Emergency Action Flan and tour facility, since construction has not begun. Tier II report current Y/N/NA. Other Hazardous materials stored on site if non -Tier II Facility' 1. Battery Bank Electrolyte (dilute sulfuric acid, �30%). Likely to be 60 cells at approximately 4.5 lbslcell of pure H2So4, therefore 270 lbs of H2So4. 12. Safety and Training Review: Each year, employees are provided with all necessary information concerning the proper handling of a chemical/oil spill, accident, or emergency through computer -based training. These training modules detail proper procedures, which shall be signed and dated by each employee when all items are understood (via CBT testing). Also, proper use of cleanup and containment tools and procedures will be demonstrated as necessary for job specific functions. Any new or updated information or procedures will be taught to employees immediately when applicable. Job specific training will be performed on site prior to erployees beginning work. .All Tri-State electric facilities are designed, constructed, operated, and maintained to meet or exceed all applicable standards of design and performance set forth in the National Electrical Safety Code (NESC 2012). The structures will be grounded to prevent arcing (which could start a fire). Tri-State prohibits storage of flammables, construction of flammable structures, and other activities that have the potential to cause or provide fuel for fires on its Rows. There are no explosive substances associated with the proposed substation. Facility Manager _ Lucio Guevara Mendoza Fire Dept. Official Sandra Friedrichsen Weld County OEM Dave Burns Datel~ % �Z Y Date Date Substation and Transmission Line EMF and Audible Noise Analysis Iron Mountain Substation August 2024 Prepared for: Tri-State Generation & Transmission Association, Inc. 1100 W 116th Avenue Westminster, CO 80234 Prepared by: Nikki Olson Nikki.Olson@Ulteig.com Almir Ekic Almir.Ekic@Ulteig.com Stacey Page Stacey.Page@Ulteig.com 24.01064 I 701.355.2324 701.280.8555 I 208.748.5992 U Iteig Denver Office 5575 DTC Pkwy, Ste 200 Greenwood Village, CO 80111 TABLE OF CONTENTS TABLE OF CONTENTS 2 FIGURES 2 TABLES 3 1. EXECUTIVE SUMMARY 4 2. INTRODUCTION 4 3. NOISE BACKGROUND 5 3.1 Audible Noise 5 3.2 EMF 7 4. EVALUATION CRITERIA 7 4.1 Audible Noise 7 Weld County, Colorado Charter and County Code 7 Colorado Revised Statutes Title 25 Article 12 Noise Abatement 7 Public Utilities Commission Rule 3206 (f) 8 4.2 EMF 8 IEEE C95.1-2019 8 Public Utilities Commission "Rules Regulating Electric Utilities" 8 5. METHODOLOGY 9 5.1 Substation Audible Noise 9 5.2 Substation EMF 10 5.3 Transmission Line EMF and Audible Noise 11 6. RESULTS 12 6.1 Substation Audible Noise 12 6.2 Substation EMF 13 6.3 Transmission Line EMF and Audible Noise 15 7. REFERENCES 18 Appendix A. Analysis Results Appendix B. Exhibits Appendix C. Project Information FIGURES Figure 1. Project Location Map 5 Figure 2. Common Noise Sources and Levels 6 Figure 3. CDEGS Substation EMF Model 11 Figure 4. Substation Electric Field Result 13 Figure 5. Substation Magnetic Field Result 14 Figure 6. Transmission Line Electric Field Result 15 Figure 7. Transmission Line Magnetic Field Result 16 Figure 8. Transmission Line Audible Noise Result 17 � eig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 2 TABLES Table 1. Weld County, Colorado Charter and County Code Maximum Permissible Noise Levels...0000000.e.e..eeeeeeecneeeeeeee.eeeeenncenceeee.eeennnnnee.e..eeceeceeeeeece 7 Table 2. Colorado Revised Statues Maximum Noise Levels 8 Table 3. PUC Rule 3206 (f) Maximum Noise Levels..............................................................................................................................................8 Table 4. IEEE C95.1-2019 Recommended Exposure Limits for Electric and Magnetic Fields ......ve:eeve,eeeCV0, CVCt]eVC]ee1CYe,e0Ct2e'CI0VI, Cee, Cv.Cee VC:e ee Cr, e, CV etee ve re 0170 8 Ta b l e 5. P U C E M F L i m i t s.... E e. E 0 U. 0 OS 0011,116 E e. E 0000 0000 00 ISO E e. E.... OS E E C E ISO E e. E 0000 OS 00 00 ISO E e. E 00 00 tie tie.... E e. E 00 Oa DO E I C e SO E e. E. e. 0 E E E E 00 E Y CO 9 OW ev vv et:00 av CO vv vv 000e1 001,....0 vv av vv ma vv to av CO vv ee e. Oa vv ve ay. e6. TransformerAudible Sound Levels 9 Table7. SoundPLAN Essential Input Values....[IC .............. MUUMUU .......................e...........e.............e.e..e.....e....e.e..............ee...e...........e.............e.e.......10 Table8. Transformer Assumed Parameters vv tic v.vv vv vv vv.v vatic vv cocas', vv.v vv tic va es' co va vv or vatic va vv vv vacs, or. vv 'lc to vv vv vv vv.v vatic :Dacca'', ever vv tic va es' co va vv or vatic va vv vv tails, or. ee vote ee co ee ev.t eeve].e Table 9. Substation Noise Analysis Results.vevvveevvvvvevevvvevvevvvevvveevveveveevvv0001,evvvevveeee.vv:eevvvevveeee.vvevevvvevvevvvevvveevveveveevvv0001,evvee.veeee.vv:eeeveeeveeee.vvee...e.....12 teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 3 1. EXECUTIVE SUMMARY Ulteig Operations LLC (Ulteig) completed a substation audible noise, substation electromagnetic field (EMF), transmission line EMF, and transmission line audible noise analysis in support of the Iron Mountain project to predict noise and EMF levels from the proposed substation and transmission line. The project consists of a new 115/12.5 kilovolt (kV) substation with an associated 115kV transmission line to be built in Weld County, Colorado. The substation audible noise analysis was conducted in accordance with the accepted environmental noise assessment practices (International Organization for Standardization [ISO] Standard 9613-2); Weld County, Colorado Charter and County Code; the Colorado Revised Statues Title 25 Article 12 Noise Abatement regulations: and the Public Utilities Commission (PUC) Rule 3206 (f). Sound levels for receivers modeled at the property line ranged from 26.8 A -weighted decibels (dB(A)) to 31.9 dB(A). Sound levels for receivers modeled 25 feet from the property line ranged from 26.0 dB(A) to 30.4 dB(A). The maximum noise levels from the two transformers operating at maximum capacity were calculated to be 31.9 dB(A) at Receiver 6 (north property boundary), which is below the lowest accepted value of 50 dB(A) at night based on the criteria set forth in the aforementioned project standards for acceptable levels of noise. The analysis modeled the proposed substation transformers operating at the highest noise emissions operating condition and calculated project -related noise levels for eight locations at and around the substation property boundary using SoundPLAN Essential software. The transmission line noise analysis was conducted in accordance with the accepted environmental noise assessment practices (International Organization for Standardization [ISO] Standard 9613-2); Weld County, Colorado Charter and County Code; the Colorado Revised Statues Title 25 Article 12 Noise Abatement regulations, and the Public Utilities Commission (PUC) Rule 3206 (f). Sound levels for receivers modeled at the edge of the right-of-way (ROW) are predicted to be 8.2 dB(A), which is below the lowest accepted value of 50 dB(A) at night based on the criteria set forth in the aforementioned project standards for acceptable levels of noise. All transmission line values are well below the recommended limits as defined in Institute of Electrical and Electronics Engineers (IEEE) C95.3-2021 and US Environmental Protection Agency (EPA) limits for audible noise. The substation and transmission line EMF analysis was conducted in accordance with PUC and IEEE C95.3-2021 "Recommended Practice for Measurements and Computations of Electric, Magnetic, and Electromagnetic Fields with Respect to Human Exposure to Such Fields, 0 Hz to 300 GHz". The maximum electric field is predicted to be 0.45 kilovolt per meter (kV/m) at the fence line of the substation, which is below the recommended limit of 5 kV/m dictated by IEEE for the general public. A maximum magnetic field is predicted to be 4.784 milliGauss (mG) at the property line of the substation, which is below the recommended limit of 150 mG dictated by PUC for the general public. For the transmission line, the maximum electric field was predicted to be 0.457 kV/m within the ROW and 0.377 kV/nn at the edge of the ROW. The maximum magnetic electric field is predicted to be 72.926 mG with a value of 38.031 mG at the edge of the ROW. Both the electric and magnetic field maximum values produced by the substation and transmission line are well below the recommended exposure limits for the general public. 2. INTRODUCTION Tri-State Generation & Transmission Association, Inc. is planning to construct the Iron Mountain Substation in Weld County, Colorado. The project consists of a new 115/12.5 kV substation. The primary components of the project include two 24/32/40 megavolt-amperes (MVA), three phase transformers, and a 115 kV transmission line. The purpose of this study is to model the predicted substation transformer noise, transmission line noise, substation EMF, and transmission line EMF emitted as a result of the project compared to the regulations from the Weld County, Colorado Charter and County Code; Colorado Revised Statues Title 25 Article 12 Noise Abatement; PUC Rule 3206 (f); and the IEEE C95.3-2021. Weld County is located in northern Colorado. The project is located approximately two miles northeast of Kelim, Colorado in a rural area. See Figure 1. Project Location Map. The proposed substation area is approximately 6 acres. The nearest residence is approximately 1,000 feet northeast of the substation. The project site and the surrounding area is zoned as agricultural. terg Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 4 Iron Mountain Substaton and TrarisrrI►ssiuri Liar EMF and Audible Noise Study Figure 1. Project Location Map Legend ♦ Project Lunation 3. NOISE BACKGROUND 3.1 Audible Noise Noise is defined as unwanted sound. Sound is made up of tiny fluctuations in air pressure, and within the range of human hearing, it can vary in pressure by over one million units. These units, known as the decibel (dB) scale, are measured on a logarithmic scale and quantify sound pressure on a more manageable range. Sound is characterized by its amplitude (how loud it is), frequency (the pitch), and duration (how long it lasts). The human ear does not hear all frequencies equally and may reduce emphasis on very low and very high frequencies. The A -weighted scale (dB(A)) is used to reflect the selective sensitivity of human hearing. This scale puts more weight on the range of frequencies that the average human ear perceives, and less weight on those that are not heard as well, such as the very high and very low frequencies. The human range of hearing extends from approximately 3 dB(A) to around 140 dB(A). See Figure 2. Common Noise Sources and Levels. teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 5 COMMON OUTDOOR SOUND LEVELS �} f !rin a4 3 i'- Gas timeshreativer at 3 it. stiTruck at150i. 'daisy kioian Busy Nl9hwoayst SOIL €rritrtial Ittea (Vitt 'khan rr��a 110 100 90 80 110 COMMON INDOOR SOUND LEVELS atice; inside $uPirelli 'faa WI EPeitif York) food MN* at 3 ft. lbMO OXsCPCIM ft - tires 3 ft, Wt4lanti Orono 44 I CI It NtsrtrralSpitoch as 3 L:er iivihriti5 Offxr Dcsivor aurer (Wm Room Small T?atli1'ast Ives? C� ietr+ru€se ROOM 41 egluvcor41 library Be& Dorm at kitir Concert MA tlia k 9ti 11tre told $74.Mearing Figure 2. Common Noise Sources and Levels (Fundamentals of Noise and Sound, 2022) wirillloW„ 4110- iiik. itt q ;17 r4,4 0 Environmental noise is often expressed as a sound level occurring over a stated time period, typically one hour. When the acoustic energy is averaged over the stated time period, the resulting equivalent sound level represents the energy -based average sound level. This is called the equivalent level, or Leq. Therefore, the Leq represents a constant sound that, over the specified period, has the same acoustic energy at the time -varying sound. When operational, the transformers emit an audible sound that varies with the type of transformer and the distance of the receptor. Sound is primarily generated from three primary sources associated with the transformer. These include core noise, load noise, and the noise generated by the operation of cooling equipment. Core noise is generated by a phenomenon called magnetostriction. The sound, which is audible as a hum, comes from the extension and contraction of the core pieces when magnetized. The core noise is the primary noise and does not vary with the electrical load. When operational, the transmission lines emit an audible sound that varies with the size of the conductors, voltage level of transmission, weather conditions, and the distance of the receptor. The term ambient acoustic environment refers to the all-inclusive sound in a given environment or community. The outdoor ambient acoustic environment is made up of sound from many sources from varying distances and directions. Common sound sources within an agricultural, rural, and residential environment include, but are not limited to, sounds from farm equipment, the sound generated from traffic on roadways, sounds from wildlife, and wind rustling through the vegetation. In rural areas, higher sound levels typically exist near roadways and other areas that experience greater human activities such as residential developments. In addition, environments with higher wind resources generally experience higher sound levels than environments with lower quality wind resources. During weather events such as rain or snow, the liquid can be vaporized which increases the transmission audible noise level. The typical values presented for the transmission audible noise are for rainy conditions. terg Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 6 3.2 EMF An electromagnetic field (EMF) comprises a combination of electric and magnetic fields, which for those fields associated with electrical equipment, for the most part act independently of each other. Electric and magnetic fields are associated with the voltage and current of the equipment, respectively. An electric field is a region where electric charges experience an invisible force. The strength of this force is related to the voltage on the electrical equipment. Electric fields are strongest closest to their source and the strength rapidly diminishes by the square of the distance away from the source. A magnetic field is a region where materials that have magnetic properties experience an invisible force produced by various sources, in this case the flow of electric current through electrical equipment. As magnetic fields are related to electric current rather than voltage, humans are exposed to magnetic fields through interaction with various everyday items such as appliances. Magnetic field strength is related to the size of the electric current flowing through an electrical conductor and diminishes by the square of the distance away from its source. 4. EVALUATION CRITERIA 4.1 Audible Eloise Noise levels specified in the Weld County, Colorado Charter and County Code; Colorado Revised Statues Title 25 Article 12 Noise Abatement; and the PUC Rule 3206 (f) were used as the basis for the analysis. Recall the project area is zoned agricultural. Note there are no noise criteria for agricultural land use specified in the aforementioned guidelines. Therefore, the model outputs were evaluated against the lowest noise level of 50 dB(A) for residential land use for a conservative assessment. Weld County, Colorado Charter and County Code Article IX, Section 14 in the Weld County, Colorado Charter and County Code establishes the maximum permissible noise levels for each type of property during specific hours of the day. See Table 1. Weld County, Colorado Charter and County Code Maximum Permissible Noise Levels. The Charter and Code states, "any sound levels which exceed the set sound levels for any type of property at any time of day is prohibited...Noise originating on private property shall be measured at or within the boundary of the property from which the noise complaint is made." Table 1. Weld County, Colorado Charter and County Code Maximum Permissible Noise Levels Land Use Residential Property or Commercial Area Industrial Area or Construction Activities Non Specified Areas Maximum Noise (dB(A)) 7:00 a.m. — 9:00 p.m. 55 dB(A) 80 dB(A) 55 dB(A) Maximum Noise (dB(A)) 9:00 p.m. - 7:00 a.m. L 50 dB(A) 75 dB(A) 50 dB(A) Colorado Revised Statutes Title 25 Article 12 Noise Abatement Colorado Revised Statues Article 12. Noise Abatement 25-12-103 establishes sound levels of noise radiating from a property line at a distance of 25 feet or more therefrom in excess of the dB(A) during specific hours of the day constitute a public nuisance. See Table 2. Colorado Revised Statues Maximum Noise Levels. teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 7 Table 2. Colorado Revised Statues Maximum Noise Levels Land Use Maximum Noise (dB(A)) 7:00 a.m. — 7:00 p.m. Maximum Noise (dB(A)) 7:00 p.m. — 7:00 a.m. Residential Commercial Light Industrial Industrial 55 dB(A) 60 dB(A) 70 dB(A) 80 dB(A) 50 dB(A) 55 dB(A) 65 dB(A) 75 dB(A) Public Utilities Commission Rule 3206 (f) According to the PUC Rule 3206 (f), sound levels of noise radiating from a property line or right-of-way at a distance of 25 feet should be at or below defined values. See Table 3. PUC Rule 3206 (0 Maximum Noise Levels. 4.2 EMF Table 3. PUC Rule 3206 (f) Maximum Noise Levels Land Use Maximum Noise (dB(A)) Residential Commercial 50 dB(A) 55 dB(A) Light Industrial 65 dB(A) Industrial 75 dB(A) IEEE C95.1-2019 EMF exposure limits were taken from IEEE C95.1-2019. Table 4 in IEEE C95.1 dictates the electric field exposure reference level (ERL), which is the maximum exposure level relative to ambient electric field strength. Table 2 in IEEE C95.1 dictates the magnetic field ERL, which also applies to the magnetic field strength. Specifically, substations and transmission lines adhere to the persons in unrestricted environments section for both electric and magnetic fields. See Table 4. IEEE C95.1-2019 Recommended Exposure Limits for Electric and Magnetic Fields. Table 4. IEEE C95.1-2019 Recommended Exposure Limits for Electric and Magnetic Fields Persons in unrestricted environments Electric Field Limit (kV/m) Magnetic Field Limit (mG) 5 9040 Public Utilities Commission "Rules Regulating Electric Utilities" In addition, magnetic field exposure limits were taken from the PUC document "Rules Regulating Electric Utilities," which are more stringent than the IEEE limits. Consequently, the limits for the magnetic field from PUC will be utilized in the report. The PUC states that the limits are held at the right-of-way and the substation boundary, which is assumed to be the substation property line. See Table 5. PUC EMF Limits. teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 8 Table 5. PUC EMF Limits Magnetic Field Limit (mG) 150 5. METHODOLOGY 5.1 Substation Audible Noise The substation audible noise study of the proposed Iron Mountain substation was conducted in accordance with ISO 9613-2, the international standard for modeling outdoor sound attenuation. A model was developed to determine the sound levels at receivers within the project area using the SoundPLAN Essential acoustical analysis software, which is designed for evaluating environmental noise from stationary and mobile sources. The analysis accounted for all noise -generating elements associated with the proposed substation transformers (noise sources) based on the conceptual layout for the project. Project -related sound levels were calculated at eight receiver locations. The receivers were placed at four points along the property boundary and at four points 25 -feet outside of the project boundary per regulations from the Weld County, Colorado Charter and County Code and Colorado Revised Statues Title 25 Article 12 Noise Abatement. The receivers were placed at a height of 1.5 meters (approximately 5 feet) to generally represent the height of human ears. Audible sound levels generated by the proposed transformers were obtained for the actual transformers selected for this project. These levels were provided by the transformer manufacturers according to the standardized measurement procedures and accounted for all sound generating elements associated with this transformer. The SoundPLAN Essential model utilized the audible sound level as shown in Table 6. Transformer Audible Sound Levels. Transformers use cooling to remove heat generated in the transformer so it can continue to perform as planned. Various methods of cooling can be used to reduce the temperature in the transformer. These methods are divided into two types of cooling: dry and oil. The transformers used on this project use oil -type cooling. There are several cooling positions used in the transformer: ONAN, ONAN/ONAF, and ONAN/ONAF/ONAF. ONAN stands for Oil Natural Air Natural, which means the transformer is cooled by surrounding in oil. The heat is transferred to the oil by natural air convection. ONAF stands for Oil Natural Air Forced, which means the transformer is cooled using air and the oil to dissipate heat. The sound levels for the OMAN/ONAF/ONAF position were used to analyze the worst - case scenario. Table 6. Transformer Audible Sound Levels Position Audible Sound Level (dBA) ONAN 72 ONAN/ONAF 74 ONAN/ONAF/ONAF 75 The sound for each transformer was modeled as an area source with the sound at 2/3 the height of the transformer (3.7 meters or approximately 12 feet). The transformers were modeled as running constantly at full capacity during each time period (day and night). Only one transformer will be installed when the project is initially constructed. The second transformer is planned for future need in the substation. In order to determine the worst -case scenario, both transformers we modeled. II . • • 8/8/2024 • Page 9 Additional sources of noise within the project that were not modeled include transmission lines, County Road 60, County Road 15, Colorado Boulevard, and various low volume roads the serve destinations around the project area. A 7 -foot -tall chain link fence with bottom lock slats will be installed at the substation boundary within the property. Although the fence will aid in blocking the view to the substation, the fence will not block the entire view and it was not analyzed in the noise study. While a slight reduction in noise may be perceived, noise will still be able to get through the fence. In order to determine the worst -case scenario, the fence was not included in the model. Additional inputs are required to be included in the model to properly represent the project area. See Table 7. SoundPLAN Essential Input Values. Table 7. SoundPLAN Essential Input Values Input Average Humidityl 64% Average Temperature2 -6° Celsius or 21° Fahrenheit Air Pressure3 1,020 millibar Ground Cover Ground surrounding Factor G=0 at the project project site site (Hard), (Soft) G=1 dB(A) limit 80 dBA (Daytime), 75 dBA (Nighttime) Used highest average humidity for a more conservative analysis (Weather World, 2024). 2Used average low for a more conservative analysis (Weather World, 2024). 3Used overall high for a more conservative analysis (Weather World, 2024). 5.2 Substation EMF Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis (CDEGS) was used to create a model of the substation for the substation EMF analysis. More specifically, the high -frequency computational (HIFREQ) module, which allows for above grade modeling of conductors and equipment, was used to develop a detailed model of the substation that includes the strain bus, rigid bus, transformers, and the fence. The size and height of the strain bus and rigid bus was provided on the general arrangement. The fence was modeled using CDEGS fence library, which included sizes and depths for the steel and chain -link. Other equipment was not included as those do not generate electric or magnetic fields. The drawings, datasheets, and other information used to model the substation and transformer are provided in Appendix C, Project Information. See Table 8. Transformer Assumed Parameters. Table 8. Transformer Assumed Parameters Parameter Assumed Value Positive Impedance Sequence 8% Zero Sequence Impedance 8% Configuration 115 kV Delta / 12.47 kV Wye Short-circuit Power Losses 16.2 kW Excitation Current 0.5% No-load Losses 4.5 kW The constructed model is shown below in Figure 3. CDEGS Substation EMF Model. teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 10 f r-�- I --� • .-0‘1.7L-1; • If r' I .fir^ -f 1 ' r ' I f • I' '• tit`•' i•, ti t ` ci t_ -'tI, I' "'tit �• r` '• l... w. - h ) 1 1. Figure 3. CDEGS Substation EMF Model I'Y). 1- 1.P "1, I‘: I �t -*, - `3/4 F' r .f j„...e-111A1 f�1, r l3f ;! I After the model was constructed, the energization model was added to the substation. On the 12.47 kV bus, the currents and voltages were added to represent generation at the site. A voltage of 7.2 kV was applied to the load side of each transformer on each phase. The currents were applied to the 12.47 kV bus on the load side of each transformer. The currents applied were a total of 695.5 amps on the 12.47 kV bus. A current of 116.3 amps was applied to each phase on the load side of each transformer so that the output at the high side of the substation can be maintained at 75.9 amps. Only the full load condition was studied. After the energization model was applied, observation profiles were added around the fence line of the site for the electric field and the property line of the site for the magnetic field and extended 5 feet outside of each respective line. The observation profile was placed at a height of 3.28 feet above grade. 5.3 Transmission Line EMF and Audible Noise The transmission line was modeled in the Polaris-EMF v.1.2.1 software which is designed specifically to produce EMF and audible noise calculations. The ROW was set to 100 feet with the maximum calculated at the edge of the ROW and the overall maximum predicted. The nearest structure to the substation, a TH-15A dead-end, was modeled. The structure data sheet can be found in Appendix C, Project Information. The conductors were placed at about 60 feet in height with a spacing of 17 feet between conductors. A single ACSR 795 kcmil Drake conductor was modeled with a maximum current of 907 A per phase. A CentraCore OPGW was assumed, and the data sheet is presented in Appendix C, Project Information. teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 11 6. RESULTS 6.1 Substation Audible Noise Sound levels for receivers modeled at the property line ranged from 26.8 dB(A) to 31.9 dB(A). Sound levels for receivers modeled 25 feet from the property line ranged from 26.0 dB(A) to 30.4 dB(A). The maximum calculated noise level was 31.9 dB(A) at Receiver 6 located at the north property boundary. None of the modeled receivers would meet or exceed the conservative 50 dB(A) threshold established by the evaluation criteria above. See Table 9. Substation Noise Analysis Results, Appendix A, Analysis Results, and Appendix B, Exhibits. Table 9. Substation Noise Analysis Results Receiver Daytime (dB(A)) Sound Level Nighttime (dB(A)) Sound Level Location 1 27.9 27.9 25 Property feet from Boundary West 2 30.4 30.4 25 Property feet from Boundary North 3 26.0 26.0 25 Property feet from Boundary East 4 28.6 28.6 25 Property feet from South Boundary 5 28.9 28.9 West Property Boundary 4 6 31.9 31.9 North Property Boundary 7 26.8 26.8 East Property Boundary 8 29.9 29.9 South Property Boundary Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 12 6.2 Substation EMF See Figure 4. Substation Electric Field Result below for a plot of the electric field measured at the fence line at a height of 3.28 feet above grade. The electric field expected at the fence line of the substation is 0.45 kV/m (450 V/m), which is safely below the IEEE threshold of 5 kV/m (5,000 V/m). The electric field decreases the further you get away from conductive material so near the fence line is where the electric field should be at a maximum for an individual standing outside of the substation. The electric field is highest where there are more conductors as shown in the plot where the electric field is at its maximum toward the west side of the substation. Electric FieldsaResuttynt (Total) [ID•SI_IB_GPJD tcY:! t=60.0000 H? J 32 0_ / 220 w 120 20 -80 l L -a I � i I -70 30 130 230 330 X AXIS (FEET) Electric Field Total Magri. (VIM) LEGEND D j1,,1 a.: ;I I"I"I I.1 III Value 45i17137 11, r' 13 , 15 i I l l I I I_a 1-(I e. 0.527 4 405.74 36O 72 ;1=1.6Y 270 ei 995.65 180.6! 135.60 . I 9O . 57 AL: 3.O3 Figure 4. Substation Electric Field Result teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 13 See Figure 5. Substation Magnetic Field Result below for a plot of the magnetic field measured at the property line at a height of 3.28 feet above grade. The magnetic field expected at the property line of the substation is 4.784 mG, which is safely below the PUC threshold of 150 mG. The magnetic field decreases the further you get away from the generation so near the property line is where the magnetic field should be at a maximum for an individual. The magnetic field is highest where the site is being energized from, and since the site is being energized from the 12.47 kV side imitating a full generation scenario, the magnetic field seen is at its highest on the 12.47 kV side. IAaanetic Fields'Resultant (Total) [ID:SUEL0ND @f=60.000O Hz] 600 400 200 w w u_ ›— -200 S. vie iir- ar-- r I 1 —200 0 200 400 000 x Ax i s (FEET) Total Magnetic Induc. (MilliGauss) LEGEND Maximum Value C' iitll'(lal'fI Value t C C 4 4.78 4 33 3.88 3 .a 3 9.98 2.53 2.08 1.63 1.18 0.73 4.784 0.279 Figure 5. Substation Magnetic Field Result teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 14 6.3 Transmission Line EMF and Audible Noise See Figure 6. Transmission Line Electric Field Result below shows the expected magnitude of the electric field at the edge of the ROW and the maximum in the ROW. From the calculated value of 0.457 kv/m the electric field is well below the recommended limit of 5 kV/m. Electric Field _ 0.3 v 41) 0.25 LAI 0.1 0.0.5 0 1 t 1 1 1 1 I 1 1 r Y ' ' �l I. 1 1 . i 1 II 1 P t I 1 I I I I ! I I I I 1 1 I I t t I 1 1 t t 1 1 t q I q l I t 1 q I I 1 I I I I I � � ,� � En r+ a4 ur, c� r.� � oe+ �y u� � ,� too ,� �1�yy ttpp �--i � q ti ,; 4? CCs u7 tA7 3T Cry c'i CV ra tV � .� 7 1 a 1 . i r -I , i Fis ted 7 E 1 4'7 zit' 4 gl' 1 i)1 tt? u 7 t{3 I 1 1 a 1 V Y 1 Y 1 1 1 1 G Y 1 l 1 Distance (ft) Figure 6. Transmission Line Electric Field Result Electric Feld ROW teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 15 Figure 7. Transmission Line Magnetic Field Result shows the predicted transmission line magnetic field at the edge of the ROW and the maximum inside the ROW. The maximum value of 72.926 mG is less than the recommended exposure limit of 150 mG. Magnetic Field. I I 70 50 F E J a .40 m 30 20 10 0 1 I I I I I I I 1 1 1 f t 1 1 1 1 1 I t 1 1 f 1 I 1 l I' 1 I 1 ca oa tri (NJ ev LO oa Distance (ft) e gai � 113�Sr; P.�:gZct3RIrn Figure 7. Transmission Line Magnetic Field Result Magnetc: Field ROW teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 16 Figure 8. Transmission Line Audible Noise Result presents the expected audible noise levels for the transmission line. The maximum audible noise for the transmission line is 8.2 dB(A) with a value of 6.6 dB(A) at the edge of the ROW. Both values are significantly below any of the recommended limits listed previously. Audible @Oise 9 8 8 rt a_ 0 cv 5 an 4 �C 3 2 1 1 I 1 1 1 I 1 1 I I �-1 I I 1 1 If 1 1 1 1 U T � iAf Q? zP4 VR h r 4 1 I 1 1 1 I I 1 I 1 I I I �i 1 1 1 I 1 1 1 1 1 I 1 1 I 1 I t�!7I NON r I I I +Cr Cab al a [distance (ft) .�ihlfi�ll ((+1 VA zit 4:a;nre-) r � c Figure 8. Transmission Line Audible Noise Result A Audible Noise ROW teig Substation and Transmission Line EMF and Audible Noise Analysis • Iron Mountain Substation 8/8/2024 • Page 17 7. REFERENCES Colorado Office of Legislative Services. (2024). Colorado Revised Statutes. Retrieved from https://advance.lexis.com/documentpage/?pdmfid=1000516&crid=948e81 b6-522e-4da6-8100- 8a5abde54c57&config=014FJAAyNGJkY2Y4Zi1 mNjgyLTRkN2YtYmE4OS03NTYzNzYzOTg0OGEKAFB vZENhdGFsb2d592qv2Kywlf8caKqYROP5&pddocfullpath=°/02fshared°/02fdocument%2fstatutes- legislation°/0 Fundamentals of Noise and Sound. (2022, March). Retrieved from Federal Aviation Administration: https://www.faa.gov/regulations_policies/policy_ guidance/noise/basics IEEE. (2019). IEEE Standard for Safety Levels with Respect to Human Exposure to Electric, Magnetic, and Electromagnetic Fields, 0 Hz to 300 GHz. New York: IEEE. International Organization of Standardization. (2024). Acoustics - Attenuation of sound during propagagtion outdoors (ISO 9613-2:2024). Retrieved from https://www.iso.org/standard/74047.html Public Utilities Commission. (2024). Rules Regulating Electric Utilities. Denver: Code of Colorado Regulations. Public Utilities Commission. (n.d.). Code of Colorado Regulations. Retrieved from https://www.sos.state.co.us/CCR/GenerateRulePdf.do?ruleVersion Id=5738 Weather World. (2024). Weld County, Colorado Climate Averges. Retrieved from https://www.weatherworld.com/climate-averages/co/weld+county.html Weld County, Colorado - Charter and County Code. (2024, 05 31). Retrieved from https://library.municode.com/co/weld_county/codes/charter_ and county_ code?nodeld=CH 14HEAN_ART IXNO YIN . • • 8/8/2024 • Page 18 Appendix A. Substation Audible Noise Analysis Results Emissions of Industry Sources Table Receiver Results Table Contributions Table Mean Propagation Table Noise Emissions of Industry Sources Source name Reference Day dB(A) Level Night dB(A) Corrections Cwa I I C dB dB CT dB Transformer 1 Transformer 2 Lw/unit Lw/unit 75.0 75.0 75.0 75.0 Ulteig Engineers Inc., 3350 38th Avenue South, ND 58104 Fargo Page 1 Receiver List No. Receiver name Building side Floor Day dB(A) Limit Night Level Day Night dB(A) Conflict Day dB Night 1 1 - 1.FI 50 50 27.9 27.9 - - 2 2 - 1.F1 50 50 30.4 30.4 - - 3 3 - 1.F1 50 50 26.0 26.0 - - 4 4 - 1.F1 50 50 28.6 28.6 - - 5 5 - 1.F1 50 50 28.9 28.9 - - 6 6 - 1.F1 50 50 31.9 31.9 - - 7 7 - 1.F1 50 50 26.8 26.8 - - 8 8 - 1.F1 50 50 29.9 29.9 - - Ulteig Engineers Inc., 3350 38th Avenue South, ND 58104 Fargo Contribution Levels of The Receivers Source name Day Level dB(A) Night 1 1.FI 27.9 27.9 Transformer 1 Transformer 2 25.0 24.9 25.0 24.9 2 1.F1 30.4 30.4 Transformer 1 Transformer 2 23.6 29.4 23.6 29.4 3 1.FI 26.0 26.0 Transformer Transformer 1 2 23.1 22.9 23.1 22.9 4 1.F1 28.6 28.6 Transformer Transformer 1 2 27.4 22.3 27.4 22.3 5 1.F1 28.9 28.9 Transformer Transformer 1 2 25.8 26.0 25.8 26.0 6 1.FI 31.9 31.9 Transformer Transformer 1 2 24.4 31.1 24.4 31.1 7 1.FI 26.8 26.8 Transformer Transformer 1 2 23.7 23.8 23.7 23.8 8 1.F1 29.9 29.9 Transformer 1 Transformer 2 28.9 23.1 28.9 23.1 Ulteig Engineers Inc., 3350 38th Avenue South, ND 58104 Fargo Mean Propagation Source Source typE Time slice dB(A) L'w dB(A) Lw dB KI KT dB DO dB S m Adiv dB Agr dB Abar dB Aatm dB Amisc dB ADI dB dLrefl dB dB(A) Ls Cmet dB dLother/dE dLw dB ZR dB Lr dB(A) 6 , GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 88.60 -49.9 -3.5 0.0 -0.2 0.0 0.0 0.0 24.4 0.0 -1.0 0.0 0.0 24.4 3 Night 59.9 75.0 0.0 0.0 3.0 88.60 -49.9 -3.5 0.0 -0.2 0.0 0.0 0.0 24.4 0.0 -1.0 0.0 0.0 24.4 4 Day 60.0 75.0 0.0 0.0 3.0 47.59 -44.5 -2.3 0.0 -0.1 0.0 0.0 0.0 31.1 0.0 -1.0 0.0 0.0 31.1 4 Night 60.0 75.0 0.0 0.0 3.0 47.59 -44.5 -2.3 0.0 -0.1 0.0 0.0 0.0 31.1 0.0 -1.0 0.0 0.0 31.1 7, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 95.35 -50.6 -3.5 0.0 -0.2 0.0 0.0 0.0 23.7 0.0 -1.0 0.0 0.0 23.7 3 Night 59.9 75.0 0.0 0.0 3.0 95.35 -50.6 -3.5 0.0 -0.2 0.0 0.0 0.0 23.7 0.0 -1.0 0.0 0.0 23.7 4 Day 60.0 75.0 0.0 0.0 3.0 94.09 -50.5 -3.6 0.0 -0.2 0.0 0.0 0.0 23.8 0.0 -1.0 0.0 0.0 23.8 4 Night 60.0 75.0 0.0 0.0 3.0 94.09 -50.5 -3.6 0.0 -0.2 0.0 0.0 0.0 23.8 0.0 -1.0 0.0 0.0 23.8 S , GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 57.93 -46.3 -2.7 0.0 -0.1 0.0 0.0 0.0 28.9 0.0 -1.0 0.0 0.0 28.9 3 Night 59.9 75.0 0.0 0.0 3.0 57.93 -46.3 -2.7 0.0 -0.1 0.0 0.0 0.0 28.9 0.0 -1.0 0.0 0.0 28.9 4 Day 60.0 75.0 0.0 0.0 3.0 98.93 -50.9 -3.8 0.0 -0.2 0.0 0.0 0.0 23.1 0.0 -1.0 0.0 0.0 23.1 4 Night 60.0 75.0 0.0 0.0 3.0 98.93 -50.9 -3.8 0.0 -0.2 0.0 0.0 0.0 23.1 0.0 -1.0 0.0 0.0 23.1 5, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 77.24 -48.7 -3.3 0.0 -0.2 0.0 0.0 0.0 25.8 0.0 -1.0 0.0 0.0 25.8 3 Night 59.9 75.0 0.0 0.0 3.0 77.24 -48.7 -3.3 0.0 -0.2 0.0 0.0 0.0 25.8 0.0 -1.0 0.0 0.0 25.8 4 Day 60.0 75.0 0.0 0.0 3.0 74.60 -48.4 -3.4 0.0 -0.2 0.0 0.0 0.0 26.0 0.0 -1.0 0.0 0.0 26.0 4 Night 60.0 75.0 0.0 0.0 3.0 74.60 -48.4 -3.4 0.0 -0.2 0.0 0.0 0.0 26.0 0.0 -1.0 0.0 0.0 26.0 1, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 83.26 -49.4 -3.4 0.0 -0.2 0.0 0.0 0.0 25.0 0.0 -1.0 0.0 0.0 25.0 3 Night 59.9 75.0 0.0 0.0 3.0 83.26 -49.4 -3.4 0.0 -0.2 0.0 0.0 0.0 25.0 0.0 -1.0 0.0 0.0 25.0 4 Day 60.0 75.0 0.0 0.0 3.0 83.01 -49.4 -3.6 0.0 -0.2 0.0 0.0 0.0 24.9 0.0 -1.0 0.0 0.0 24.9 4 Night 60.0 75.0 0.0 0.0 3.0 83.01 -49.4 -3.6 0.0 -0.2 0.0 0.0 0.0 24.9 0.0 -1.0 0.0 0.0 24.9 3, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 101.5L51.1 -3.6 0.0 -0.2 0.0 0.0 0.0 23.1 0.0 -1.0 0.0 0.0 23.1 3 Night 59.9 75.0 0.0 0.0 3.0 101.5 -51.1 -3.6 0.0 -0.2 0.0 0.0 0.0 23.1 0.0 -1.0 0.0 0.0 23.1 4 Day 60.0 75.0 0.0 0.0 3.0 102.3 -51.2 -3.7 0.0 -0.2 0.0 0.0 0.0 22.9 0.0 -1.0 0.0 0.0 22.9 4 Night 60.0 75.0 0.0 0.0 3.0 102.3 -51.2 -3.7 0.0 -0.2 0.0 0.0 0.0 22.9 0.0 -1.0 0.0 0.0 22.9 2, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 96.24 -50.7 -3.6 0.0 -0.2 0.0 0.0 0.0 23.6 0.0 -1.0 0.0 0.0 23.6 3 Night 59.9 75.0 0.0 0.0 3.0 96.24 -50.7 -3.6 0.0 -0.2 0.0 0.0 0.0 23.6 0.0 -1.0 0.0 0.0 23.6 4 Day 60.0 75.0 0.0 0.0 3.0 55.36 -45.9 -2.6 0.0 -0.1 0.0 0.0 0.0 29.4 0.0 -1.0 0.0 0.0 29.4 4 Night 60.0 75.0 0.0 0.0 3.0 55.36 -45.9 -2.6 0.0 -0.1 0.0 0.0 0.0 29.4 0.0 -1.0 0.0 0.0 29.4 4, GF 3 Area Day 59.9 75.0 0.0 0.0 3.0 66.07 -47.4 -3.1 0.0 -0.1 0.0 0.0 0.0 27.4 0.0 -1.0 0.0 0.0 27.4 3 Night 59.9 75.0 0.0 0.0 3.0 66.07 -47.4 -3.1 0.0 -0.1 0.0 0.0 0.0 27.4 0.0 -1.0 0.0 0.0 27.4 4 Day 60.0 75.0 0.0 0.0 3.0 106.9L51.6 -3.9 0.0 -0.2 0.0 0.0 0.0 22.3 0.0 -1.0 0.0 0.0 22.3 4 Night 60.0 75.0 0.0 0.0 3.0 106.9 -51.6 -3.9 0.0 -0.2 0.0 0.0 0.0 22.3 0.0 -1.0 0.0 0.0 22.3 Ulteig Engineers Inc., 3350 38th Avenue South, ND 58104 Fargo Appendix B. Substation Audible Noise Exhibits P roject Results Exhibit N oise Map Day Exhibit N oise Map Night Exhibit teig PROPERTY LINE DETENTION POND SUBSTATION FENCE 26.8 26.8 26.0 26.0 Signs and symbols Receiver Area source Limit line Day: 50 dB(A) Limit line Night: 50 dB(A) : 2840 15 30 60 90 120 PROPERTY LINE DETENTION POND SUBSTATION FENCE Iron Mountain Substation Audible Noise Study Noise Map Day Signs and symbols Area source 6 12 18 24 30 36 42 48 54 60 66 72 < 0 6 12 18 24 30 36 42 48 54 60 66 72 78 >= 78 : 2840 15 30 60 PROPERTY LINE DETENTION POND SUBSTATION FENCE Iron Mountain Substation Audible Noise Study Noise Map Night Signs and symbols Area source 6 12 18 24 30 36 42 48 54 60 66 72 < 0 6 12 18 24 30 36 42 48 54 60 66 72 78 >= 78 : 2840 15 30 60 Appendix C. Project Information Project Drawings Transformer Datasheets Polaris Settings Steady-state Current Flows teig 250' - z ; • _T a n Y w x x x x X X X x x x x x X �- Ij off 7 ! 5fj�,1 � Y x .lJ / HIGH BUS 22FT LOW BUS 15FT A -FRAME CONDUCTOR 42FT / ;, el A -FRAME STATIC 52FT "`r � 7 - STATIC MAST 52FT x >r- f H CONDUCTOR 35FT ? -FRAME 235FT 18 N,�N H -FRAME STATIC 4 � i \ RIGID BUS 4" SCH 40 19' 19' 20' ', 36' STRAIN BUS 1272 ACSR. 25' , Ash \ ' A c `� x ,, r \\\22., BO i f }I{I 12.4 7k V IF tl 22' _ AO CO 40� 8� CO HIGH BUS 26FT Bra II X LOW BUS 23FT RIGID BUS 3" SCH 40 FUT. SW FUT. SW i. STRAIN BUS 795 ACSR 15' „, ' I' I . _ I ' BKR « ri I.1 "^ FUT. t- _, 'n 15' #7r iItiI ��:"��c .� BKR �. x StiV _-- - SW , ## ## \ x 15 i ,.,., k_ w oW� “2, v) x - II i d LLI O ��LI a � A - . 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X0W 0o0S of 3'19NV 3N11 ea Ai ado SJArta6ui3ods atoll i M9H0 uo .roi • T :S3I0N --b-W1 - Q1130Y36 +Al8W3SSY H9H0 b ii -M1 - 0N30V30 ' A18WISSV VOlYlt1SN I 9 Z1 -3 -Wl - 310011 ' A 18W3SSY NO1V1115 11 8 -91 - A100 140103W '9111A09 '311 310d t 01 a -91 -- .Aida W11103W ' IN3WW)V11Y An9 h 6 0 0----91 - A100 - - ' 1113WIDV11Y A09 9 e ai impunoig ' dor t) _vs f L ..eine) 9 3a aditl 3W ' lnulaol .I 9 Q S STI-W1 Me aioq ,91/1.1 ' BUJ J( _INS h i P I to 1.91 /I- I ' «b/1x' bS-11 ImA in3 ' 1agsen 9 - 3 ql l P. bal Aq • aumew ' l tog .I 9 t 4 Alnp wri1Paw pais wuY Meg S 1 'QN 3003 130M1311 NOf1dI113S30 Jllb A 1 WOO SiVIa3DIVI AO 1SI1 4;1 5I I i i • �I it £ atpN /t—% r 86/E0 pansspy ti a joN 1111131111:;-- 1113111111;?r yO-,9 „d« b Pup £ ai0N 7 n r•r fnt HI ti i '4 I drzt 1111111133::-- 31131]3111:;4"}; at----sa e -r t-� rig a it a I 1 I _ I I I I I t I 1 I I I 4111111111;,- A. 111111)111;;<< M31A Nb`id in Is 11- I- a a _ ' 4 I' €' 1 o o o u W `70,00 JACKING AND PULLING 45.25 AS ASSEMBLED AND SHIP FCD VENDOR CATALOG NO ITEM DESCRIPTION ]8600 BAS ABB -- 030 COVER WITH NON-SKID SURFACE Si ABB -- 040 HV AND LV ARRESTER GROUNDING (25 X 2.0 CU BAR & 4/0 BARE CABLE & CONNECTORS) 109.26 o P 4 8.2 7 48.27 @ Q LOAD BEARING LOAD BEARING ABB -- 041 LVN GROUNDING (4/0 BARE CABLE & CONNECTORS)• Cf * ABB -- 070 HV ARRESTER BRACKETS 70.00 70.00 r — 14.00 — ABB -- 100 TRANSFORMER NAMEPLATE y% ABB -- 101 NON -PCB DECAL ABB -- 102 CENTER OF GRAVITY NAMEPLATE (ASSEMBLED) FAN BANKS FAN BANK-B-ABB -- 104 CENTER OF GRAVITY NAMEPLATE (SHIPPED) 0 ABB -- 150 CONTROL CABINET WITH (2) REMOVABLE PLATES 28.80 LONG X 12.00 WIDE OVER 26.80 X I a, f v k - - -�� '� -� - 06 10.00 CUTOUTS (DETAIL A) / '� ABB 151 TRANSFORMER, COVER LIFTING EYES / \\ /`. " ea z 14 ABB __ 152 TRANSFORMER, JACKPAD r .‘::\ a m ABB -- 153 TRANSFORMER GROUNDING PROVISIONS S/S ((2) 0.50-13 TAPPED ON 1.75' CENTERS) 70 ABB -- TRANSFORMER BASE (SEE DETAIL) I z r o, ^ oo 154 17 156 �� Y O+ ABB -- 155 TRANSFORMER LIFTING FACILITIES �-' UNIQUE CONCEPTS 10816 156 PORTABLE FALL ARREST SYSTEM, UNIQUE CONCEPTS DESIGN •� 1 • ° • • -) -- -- 157 CURRENT TRANSFORMER JUNCTION BOX —e--e- —e--e p0 o UNITED BRASS 150V0-4 158 RADIATOR SHUT-OFF VALVE -BUTTERFLY TYPE Ir I_� 1��_ D ABB -- 160 LV ARRESTER BRACKET —65.00 DOOR SWING .. L "' "` H' yl REINHAUSEN RMV-II-2000-69 170 LOAD TAP CHANGER WITH MD -III MOTOR DRIVE — r 1,01 / REINHAUSEN -- 171 LTC LIQUID LEVEL INDICATOR LV SIDE v[Ew FRDM TM N REINNAUSEN -- 172 LTC DRAIN VALVE 2,00 w - - BASE IS EQUIPPED WITH PULLING PROVISIONS q REINHAUSEN -- 173 LTC DEHYDRATING BREATHER REINHAUSEN -- 174 LTC FILLING PLUG 2.00 0 174 BASE MAY BE SKIDDED DR ROLLED ALONG EITHER AXIS w w _ 0 laBASE DETAIL 1 REINHAUSEN -- 175 MD -III MOTOR DRIVE UNIT WITH POSITION INDICATOR , o °- '� — ((�� 0.5 -- -- 181 PRESSURE GAUGE (INSIDE NITROGEN CABINET) o = Li"w l-� -- -- 182 PRESSURE REGULATOR (INSIDE NITROGEN CABINET) v _ y 570 _ ) ... -- -- 530 VALVE 2.0 (GLOBE) DRAIN WITH 3/8 SAMPLER AND BRASS END PLUG n �I CENTER OF TANK -- 540 VALVE 2,00 WITH BRASS END PLUG 701 - 40 950 (GLOBE) u, a -. I 1ST STAGE 2NDSTAGE -- -- 560 VALVE. SO BALL AND BRASS END PLUG W XO XI X2 X3 •)�� 701 u -- -- 570 NIPPLE WITH PIPE CAP Tu .G•• -- -- 580 ,5 STORAGE CABINET (TETHER POLE) 03 •oi c 599 CONNECTOR 0.56 DIA. HOLES ON 1.75' CENTERS FOR 1.50-12 STUD 05 * `O N F Iji��:"i=� I 1[t -- -- 625 CONNECTOR 0.56 DIA, HOLES ON 1,75' CENTERS FOR 1,50-12 STUD 2NDSTAGE 1ST STAGE QUALITROI 167-50-30 646 TEMPERATURE WELL (RTD) 7 -6.00 QMESSKOL 50-A2-5 662 ING TEMPERATURE WELL _ 151 4D MT25T1fi RW2C 645 TOIPDOIL TEMPERATURE INDICATOR41 I [ I MESSKO MT-ST160KWRM/3C 660 WINDING TEMPERATURE INDICATOR o QUALITROL 900-003-065 671 SUDDEN PRESSURE RELAY (MAIN & LTC) 1,a 1010 o ? 2NDSTAGE 1ST STAGE MESSKO MTO-ST160RM/2U/AA 700 GAUGE OIL LEVEL u ZI Q Q MESSCO 685-10-31-N07-01 701 PRESSURE RELIEF DEVICE (10 PSI) WITH PIPEDOWN AND SCREEN (MAIN & LTC) o n or w o ) 2680 6. 0 2 00 -- — 712 MANHOLE WITH BOLTED COVER (24,6 DIA OPENING) VI VII= N , "' CUT — OUT C OJT _ CUT OUT _ -- 740 CORE GROUND BUSHING HOUSING AND NAMEPLATE 3594— �� 790 DE -ENERGIZED TAP CHANGER WITH PADLOCK PROVISIONS —3'354— ilI �� LOCATION OF CABINET BOTTOM CUTOUTS 1ST STAGE. 2ND STAGE * 804 BRACING RADIATOR CROSS (BOTTOM ONLY) DETAIL -A Q Q * -- -- 806 BRACING RADIATOR END (TOP AND BOTTOM) 36.00—^36.00-36.00^ �* MENK -- 944 RADIATOR (BOLTED ON) WITH DIN PLUG FITTINGS (TOP AND BOTTOM) GALVANIZED 1 } * KRENZ F26 -A9063 945 FANS 1/6 HP,IP, 230 V, 1140 RPM. 5200 CFM FANS CAPABLE TO BE MOUNTED ON EITHER SIDE OF RADIATORS) _ ( ARE PLAN VIEW FAN BANK -A FAN BANK -B @AN DETAIL * ABB 115 0800AA 948 HV BUSHING 115 KV 550 IN BIL 800 AMPS SILVER PLATED TOP STUD 1.50-12 (2,00 USABLE) (DRAWLEAD CONNECTED) ABB 025W20006E LV BUSHNG 25 KV 150 KV BIL 2000 SILVER PLATED TOP STUD 2.00-12 949 AMPS (2,50 USABLE STUD) (BOTTOM CONNECTED) AUBURN F-630 950 CORE GROUND BUSHING 10 KV 750 AMPS (MAIN AND PA) * ABB Q0965'A076B 953 ARRESTER 96 kV DUTY CYCLE 76 kV MCOV 8,75/10,00 INCH BOLT CIRCLE TO ACCOMODATE ,50 HARDWARE * ABB 0012MA010A 954 LV ARRESTER 12 KV DUTY 10.2 MCOV WITH 8.75/10.0 BOLT CIRCLE FOR 0,50 DIA MOUNTING BOLTS xi o o� -- -- 971 NITROGEN SYSTEM CABINET -- -- 973 FLANGE, 9,00 OD BLIND STEEL FORGED WITH COVER PLATE -- -- 975 UNDERCOATING (4' UP FROM GROUND) . 0 —64.0D - . v $ •z Z `l I ---...Q CO Z O V) Z O ( In k � r MT o 0.THREE u rL 30.00— 30.00--27.00—O _ ® LTC POWER TRANSFORMER PHASE, 60 HERTZ, \ 45 / m J O I� ct � Ezi J k -.Q. m CC 0 C Lj .. � Z Z O Q LL ,__CC Z � J O Q Z � QL Q VI I-. °' COOLING CLASS ONAN/ONAF/ONAF : s r L. S ti 24.0/32.0/40.0 MVA AT 65 DECREE C RISE. �I ' L.ct 700 fi46 598 IN -115000 DELTA. (550 KV BIL) WITH TAPS AT 120750/117875/115000/112125/109250 LV- 12470Y/7200 (150 KV BIL) - I-.. W/16 (.6251 TAPS A&BTU) �IO ASGEMBI FO WEIGHT POUNDS I I I APPROXIMATE I 1 I I r- t �S j)�� I o -T p 4 I' }:TIRE AIM rem 7428$ 0 1 I� o �+ _ — � 1 o a o 25890 ! u d � u I TANK AND FITTINGS L a 0 0 J ® 8706 .+� `� L _ i * RAnintips of , O I , - - - 'J �C TANK OIL 6614 - GAL 49607 1 I� = .; z o �i F ® u w 1 • Y 1 ® * RADIATOR OIL 377 - GAL = U '^ 345 - GAL 25882827 w LTC OI Z J � I -' `� (' (..) I� Q� r--Q I --- c Tr+, 6 _ J o a • p9 z w Y u TOTAL ASSEMBLED WEIGHT 163900 , f I i IVI 1i\ ' e o _ ® cL F 9� a O z z > y W ¢ a ITEMS MARKED • ARE REMOVED FOR SHIPMENT a = ix m = -"Pr I I z ❑ 671 m w .1 C y '� > I � q � APPROXIMATE GRIPPING WEIGHT POUNDS z j ` 4 > a w > w CK _ W w SHIPPING UNIT 100610 ( - coy ❑ _, ,I —6'00 1D o > _ > r > SNIPPING PARTS 10856 0)�4k ,I•I 1 = ® L T ce � TOTAL SHIPPING 111486 \\\ >va .sic a 64r y 6.40— IS � >ljj N w IM � 3,20— `10 n � (II I 3.90— B �° — >o a !r ' f'o 3'p0 a m EL > W ce 660 I �� o ^ e6F ^ OIL REQUIRED TO COVER CORE AND COIL ASSEMBLY LAJ Z �-®' 2 WITH RADIATORS INSTALLED 5740 GALLONS. o >o -' r c J o ® w n WITHOUT RADIATORS INSTALLED 5409 GALLONS f�(•) ` W� co > 'O .. 4 a wLi te,0 I— I— LL -I Q Cn I — CC ` 8 z r� D � �a K$ z �? �`'' bs W M N O OO m "'Ul�� X61 0,- -+S `pu C M— I ONl ON � t9 xU� 0 � > r0O Cry Nd�M �i ❑ i �'�j ❑ > j > HV BUSHING REMOVAL HEIGHT IS 241 INCHES �� r� N O< ] !+ o l �� o UNTANKING IS 262 INCHES n v FAR ANO 0+ 1 CORE AND COIL HEIGHT 4U ® D o t7 I=NEARNEAR SID g ¢ p a v_ ¢ dp a o � = CENTER LINE OF TANK � _ o o v U _�. , , 0 � `0 �� ¢ rti a In 0C/G—A = CENTER OF GRAVITY ASSEMBLED, 15 � .IIp ® Q ) ®C/G-S — L v = CENTER OF GRAVITY SHIPPING. // \� tf CC! >v a `J `AMBIENT TEMPERATURE O TRANSFORMER EXTERIOR COLOR IS ANSI 70 GRAY (4 MILS ) 0 o MONITOR 4 INSIDE PAINTED WHITE S a c 0 �� '.Z ¢ D �� I I ¢ a s - - PAGE IVI OF fHS DRAWING IS INTENDED TO PROVIDE ' OVERALL WEIGHTS AND DIMENSIONS AND THE GENERAL 56.50 TO CENTER ' oo ? LAYOUT OF THE TRANSFORMER, IT IS NOT INTENDED TO INDICATE THE EXACT DETAILS OF CONSTRUCTION. 975 OF CABINET 153 154 150 IS (U N 161 30 90 158 945 PAGE �2 IS FOR MANUFACTURING AND SHD'WS CONSTRUCTION DETAILS AND MANUFACTURING INSTRUCTIONS LEFT SIDE VIEW FAR SIDE FRONT LV VIEW FAR SIDE RIGHT SIDE VIEW cm �' ui one) z Al 5 � a rA g N v m o — o DWN% JW DATE% 01/21/15 CKa: JDW DATE% 01/21/15 APP: WJS DATE% 01/21/15 PAGE 1 OF 2 G.C I.a=a'8 - �Zig � N C DIMENSION/FINAL ASSEMBLY DRAWING Dwo: RRM Dote: 5-13-15 *0 2 to g A 4l Q41DID OD OD SKILL RO4ER TRANSFORMER CRAM SPRINGS. MS DWG, NO. CS00158-3300 ISSUE 02 Appd: Oote. S9166 -B11 -O44 ITEM DESCRIPTION 1. BARBED WIRE 2. EXTENSION ARM 3. TOP RAIL 4. FABRIC TIES 5. LINE POST 6. 84" FENCE FABRIC 7. TENSION WIRE 8. 12"x42" STRUCTURAL OUTSIDE FENCE w U Z W L_ W O to CONCRETE "TYPICAL LINE POST SECTION" CRUSHED ROCK SURFACE AGGREGATE ROCK SUB -SURFACE SEE NOTE 1 ITEM DESCRIPTION 1. TERMINAL GATE POST 2. LINE POST 3. GATE FRAME (AS REQUIRED) 4. MAN GATE LATCH 5. BAND FOR RAIL 6. BAND w/2 ATTACHMENTS FOR BRACE RAIL AND TRUSS 7. BOTTOM GATE HINGE 8. TENSION WIRE 9. TRUSS ROD w/TRUSS TIGHTENER 10. 84" FENCE FABRIC 11. FENCE FABRIC (AS REQUIRED, HEIGHT VARIES) 12. TOP GATE HINGE 13. 18"x42" STRUCTURAL CONCRETE 14. 12"x42" STRUCTURAL CONCRETE 15. BRACE RAIL (LENGTH AS REQUIRED) "TYPICAL MAN GATE SECTION" "TYPICAL DRIVE GATE SECTION 79 120., �� 720" �••o:••� p+ •• r� ....„•-..._..............-.....„,•::: ••, •• •• P..* ••�•••••••• • ••••�• • •� • •�•+i r �•��•�•� �•�•+•Oi.•i+ii•+iii•O ••iii • •�•• ♦ •� • Oi•+•++W o.+�•i.. ..••••••••••-••••••. •`••i+• o ••4.••••••••••+•+•+•i+i• ••ii++••ii• ♦♦rev•ip . IQ`i i•:O�iO� p�i4•:��•�i:♦•.'♦wi0i•�+�+:4++�.�.••• •o•••••♦♦•,••,+♦p•••••�••••••� •••�. d • • • ••+L ••00 •+••O:• ••i i`�• • . l••.•�•s i+i•i ♦• ♦ •• ••• ••,♦.♦•MO♦:'�••••4:♦•• •• .•�•••L•4,•..•...•,•�•:i•••:•4•4••••• ••+••••• ••i pi♦p•�•..�p•••••••••••••••••••• •�o •o�♦i• +�•io •♦gyp• ♦pdi Va.. .-•-L�i•+•i•.•+•i`.•+•i+iO+••+ii• ••iLa.!.�+�•�• L� +•�. o+�i+i ��►O+•• .N. i•• ♦oes ••♦•••• ♦• ••••vet:•••O• ••♦•••.+••♦• •♦•• _••••••• ••• ••• ♦•• . •.. „.„. .,...•p„+•+p• ..♦♦•.♦•••p.•••♦••••,..4 ,..••••...p••++...•••••••,. • ..„••••.•ro",1 • •+♦•••O•+•••♦ii♦+i••�i+♦•••♦•••••••.••q♦♦••r�i+••••+i•♦+•i••:♦•.••L+••Oi`•••i`••L`••+`•••••••i+•• e••• %��• . • •+••�••O•••••••py+•i p o i••,.••••i••� . J♦ - •.� • ••••• ••••• •• •O••••••• •••• ••••• •••© •+ •L V • rte. •• i�AV.*. • •••�•�••••♦�•�•A��•:�••:�♦��••:!••••+• `+•.•yi �•• •••-:�i©��•; � I� �i�i•:•:i••:•!iii• f.•!•'+• `•�•i••:LO•:••:+i`v.•:i::•:•i•i •:•:+:i::•:i% �i:i:• ••• ••••:� ‘•••••:•••••• • %te ..•• - ••• ••'•'�• • •'•'��••••;�••�•;•• - •'••••:••• ••�©i•:•:••••:•i••• • •�441•••�•:•:O:•:di•O••!••:•:Q• �+•••: • •b,!r:`�••• •!-•••• •••••• ••• • i •••�•�••+••.�:•• •••• •••••••♦+•Oi vs. ••••P•. ••••••••`:Oi•i••••••••••:•••�A�••+:!i ++�•'•i •iii. tea ♦•••� • •• iW..•••• • •�0••♦•��••••�•• •••• •••••••••••••••••••••••••, �•••:p••�••��••�•••, rQ••O�•;••••�••••••�•••• •• • +•+ •r••• •i•i• f -•••••••••••:••••••••:••••1 D +• •p+i •��'S' • ••� i • •.••••i •••••i•+• • ••••p:oO ••••�• •i�♦�.�•i. �.iJi••••••••:•••••••••••••••••:••••:•:+•+•••+` • •••� •'.. _ •••!p •••e •i+••o •o • i .. •••••�:i:••••••r i••••• �•••:•• 0�••••••••••0:0+•♦••i ••O•••••+• r•••:+:•:••••rep* •••••••i+:•+i••••••••••••••••••r• • �•�• •••••• +••VII �♦1..f ..•�Q•♦+�•++••••♦♦+.♦••••♦♦+••••+•••.+•I•♦•••+•L•••`•+.:•�i �t•1+�_:•'1 � �r1•••• •♦ •44•41•••••••• . • • •• ♦+• +•+•♦♦ ••• ••• • 1•••••••••••••• • ••+• o••••••• ••♦ •••+••• ••• • •• ♦b�•i ♦4♦+++i•i•+�•i`i•i••••;•i•i i'C♦i�� •v4 i•: ❖•��•:•:`:••OA♦•�•:i. ••••••• •• •• i:•+iL+.•+.� •..•• •e •• . „.....••••••-••••••• ••••••+••••i „+••• • ♦•••♦+•♦•+♦++••• ♦ ♦ + •++i•.+•••i♦i+i`OOii i•:•i`i�tii�•,ii♦i:i ♦+i•%%:�.��:�:�i.�?� ,�r .4".m• •�•��•� ♦•p+4 ••.t•�• :•♦••• :••4 411 •• •••;•4 �•�••!4 >• •� •••..•• r�s--� ,.Dr• r_`r =1 I I-1 I I -II `••4•••••••+�•i+•iii++�•ii+i♦:• �•:•: i•��: i•:•O•i+:+:i:i•:•:i•:+:•i r.•_s �: ti��Yr. • •.-40.••,•••••••••41•••••••••••••••••••••••••••••••••••;41 •••••:•••••+•+••••••41 ely•Wittatbs :44:40.04.74444••4•••40. —I 1I - O ITEM DESCRIPTION 1. TERMINAL POST 2. BRACE RAIL 3. RAIL BAND 4. BRACE RAIL BAND w/2 ATTACHMENTS 5. SOCKET FITTING 6. TRUSS ROD w/ TRUSS TIGHTENER 7. 84" FABRIC (AS REQUIRED) 8. 12"x42" STRUCTURAL CONCRETE 9. 18"x42" STRUCTURAL CONCRETE 10. TENSION BAR 11. TENSION BAR BAND 12. TENSION WIRE "TYPICAL CORNER SECTION" ITEM DESCRIPTION 1. GATE ASSEMBLED (PIPE FRAME, FABRIC, LATCH, & FITTINGS) 2. GATE POST 3. LINE POST 4- 18"x42" STRUCTURAL CONCRETE 5. BRACE RAIL (LENGTH AS REQUIRED) 6. TRUSS ROD w/TRUSS TIGHTENER 7. LATCH (INTERNATIONAL SECURITY PRODUCTS PL152) 8. BAND FOR TENSION BAR, BARBED WIRE, TRUSS ROD 9. TENSION BAR 10. TOP GATE HINGE 11. BOTTOM GATE HINGE 12. BAND w/2 ATTACHMENTS FOR BRACE RAIL 8c TRUSS 13. BAND FOR BRACE (4" O.D. PIPE) 14. TERMINAL POST CAP 15. TENSION WIRE 16. BARBED WIRE 17. 12"x42" STRUCTURAL CONCRETE I ••• •• .•:•:•i •••••• D. •:• D4.. 9 ...V• •�•••� C'•••. 1•�.+• -••:• N OTES: 1. GATES OPENING DIMENSIONS ARE FOUND ON THE GENERAL ARRANGEMENT PLAN. We!rnrr OrlYnng� i a n w In • M N 7 , _ FOX RUN SUBSTATION 0 o (f) z° Qzt oc �a. I� U ca Z zg z� O WU V) W C tiQ 1 � I co 0 7. UPDATED 8Y KENVTL y W .- if m I. 4 m 4 ' ��NO I- a'�OO�_ $'� o •' M -p tD r>• .;. � V lD M � N iyI s a '>, — X O to F w 3 .Um a 0�c0 9 0a jm N0.1 Q Own: TMC AppA KGU Date 3/30/23 one 4/25/23 51172-A-05-015 PATH. X•\Sr+72 - FOX R(RACA0 A-05 Sheets\51+72—A—05-SHE FIBER OPTIC CABLE CentraCore OPGW OPGW provides all of the benefits of a traditional shied wire, such as providing short circuits a path to ground and protecting the circuits from lightning strikes, in addition to providing an optical pathway for communication. The CentraCore design family can provide these features in a compact, light weight, high fiber density OPGW. Features Fiber counts up to 96 Light weight and compact yet robust design offering high fiber density • Central stainless steel tube housing the the fibers inserted into an aluminum pipe provides crush resistance and thermal protection for fibers Cable Components Typical Designs Applications Energy Market Transmission Right -of -Way Topmost part of the structure (shied wire position) Stainless steel tube Aluminum pipe Aluminum alloy wire Aluminum cad steel wire Optical unit FIBERS (MAX) OPGW SIZE FAULT CURRENT TOTAL CONDUCTOR AREA OVERALL DIAMETER WEIGHT APPROXIMATE RBS SAG10 CHART # MAX SHIP (PER REEL LENGTH TYPE) (KA)2SEC IN, MM2 IN MM LBS/FT KG/M LBS KGF WOOD (M) STEEL (M) 48 CC -57/465 43 0.1248 80.52 0.465 11.80 0.314 0.467 16,250 7,400 1-1421 7000 7000 48 CC -29/29/465 54 0.1248 80.52 0.465 11.80 0.238 0.354 10,500 4,700 1-1455 7000 7000 48 CC -54/472 53 0.1334 86.09 0.472 12.00 0.316 0.470 15,750 7,100 1-1450 7000 7000 48 CC -27/27/472 63 0.1334 86.09 0.472 12.00 0.244 0.362 10,000 4,600 1-1438 7000 7000 48 CC -72/504 58 0.1482 95.64 0.504 12.80 0.382 0.568 20,500 9,300 1-1442 6350 7000 48 CC -32/40/504 73 0.1482 95.64 0.504 12.80 0.296 0.441 13,750 6,300 1-1440 7000 7000 48 CC -75/528 77 0.1663 107.28 0.528 13.40 0.411 0.612 21,500 9,700 1-1453 5950 7000 48 CC -38/38/528 96 0.1663 107.28 0.528 13.40 0.310 0.462 13,750 6,200 1-1439 7000 7000 72 CC -54/472 51 0.1318 85.01 0.472 12.00 0.316 0.470 15,750 7,100 1-1457 7000 7000 72 CC -27/27/472 61 0.1318 85.01 0.472 12.00 0.243 0.362 10,000 4,600 1-1438 7000 7000 72 CC -63/507 71 0.1547 99.80 0.507 12.90 0.367 0.546 18,250 8,300 1-1450 6650 7000 72 CC -32/32/507 85 0.1547 99.80 0.507 12.90 0.282 0.420 11,750 5,300 1-1438 7000 7000 Fiber Optic Cable AFLglobal.com 800.235.3423 1 continued © 2002, AFL, all rights reserved. PP -1-00006, Revision 10, 2.23.2023 Specifications are subject to change without notice. FIBER OPTIC CABLE CentraCore OPGW Typical Designs (cons.) FIBERS (MAX) OPGW SIZE CURRENT FAULT TOTAL CONDUCTOR AREA OVERALL DIAMETER WEIGHT APPROXIMATE RBS SAG10 CHART # MAX (PER SHIP REEL LENGTH TYPE) (KA)2SEC IN2 MM2 IN MM LBS/FT KG/M LBS KGF WOOD (M) STEEL (M) 72 CC -75/528 75 0.1646 106.20 0.528 13.40 0.410 0.611 21,500 9,700 1-1421 5950 7000 72 CC -38/38/528 94 0.1646 106.20 0.528 13.40 0.310 0.461 13,750 6,200 1-1455 7000 7000 96 CC -65/500 51 0.1393 89.86 0.500 12.70 0.385 0.573 18,900 8,600 1-1442 4800 4800 96 CC -30/36/500 64 0.1393 89.86 0.500 12.70 0.306 0.456 12,750 5,800 1-1440 4800 4800 96 CC -75/528 62 0.1550 100.00 0.528 13.40 0.431 0.641 21,500 9,800 1-1442 4800 4800 96 CC -38/38/528 81 0.1550 100.00 0.528 13.40 0.331 0.492 14,000 6,300 1-917 4800 4800 96 CC -86/563 86 0.1803 116.31 0.563 14.30 0.488 0.726 24,500 11,100 1-1425 4800 4800 96 CC -34/51/563 106 0.1803 116.31 0.563 14.30 0.340 0.591 17,400 7,900 1-1460 4800 4800 This information denotes the input data needed for Sag10' (sag and tension calculation) software. WIR files of all these catalog designs can be found on PLS-CADD web page. NOTE S Data contained in the table are approximations. Please reference the exact cable data sheet for the most up-to-date information. The designs above are only a sampling of the options available from AFL. Contact customer service for a cable designed to your exact specifications. Recommended Products for CentraCore OPGW DESCRIPTION AFL NO. Fiber Optic Cable Accessories OPGW Bolted Deadend Refer to the Fiber Optic Cable Hardware catalog for specific AFL No. OPGW Mechanical Suspension Refer to the Fiber Optic Cable Hardware catalog for specific AFL No. SB01 Splice Enclosure Refer to the Fiber Optic Cable Hardware catalog for specific AFL No. Motion Control Stockbridge Vibration Damper Refer to the Transmission & Distribution catalog, Motion Control section, for specific AFL No. Qualifications GOVERNING BODY STANDARD CODE COMPONENT IEEE 1138 Cable IEC 60794-4 Cable TIA 598-D Fiber ASTM B415 Alumium Clad Steel Wire (ACS wire) Contact AFL for your customized OPGW solution. Temperature Specifications TEMPERATURE RANGE Operation -40°C to +85°C Storage -50°C to +85°C Installation -30°C to +85°C AFLglobal.com 800.235.3423 © 2002, AFL, all rights reserved. PP -1-00006, Revision 10, 2.23.2023 2 Specifications are subject to change without notice. Iron Mountain a 0 MW load: 73433 INDSORT 130.5 1.x}047 15.7 115,5 1 130.5 7201 IRNMNTN 0.0 0.0 130.5 15.7 15 7 Bus #fi 7'201 IRNMNTN 115,00 Type 1 Area 73 WAPA R.M, Zone 754 ZONEFH Voltage 1.00536PU 115.617KV Angle (deg) -8 14 1.0054 115.6 1 1 C 80 t -:re 7272 0.0 IRNMTLD 0.0 130,4 15.7 1 0054 12..E 73002 AIRPORT 1.0058 115,7 Iron Mountain at 7.4 MW load: 73433 WINDSORT 111.8 1.0039 13.4 115.4 1116 13.4 Bus # 7201 IRNMNTN 115.00 Type 1 Area 73 WAPA R.M. Zane 754 ZONEFH Voltage 1.00447PU 115.514KV Angle (deg) -8.67 7201 IRNNINTN 37.5 18.8 149.2 18.0 1 0045 115.5 1 O cc 0 0� r 348.9 18.8 149.2 7202 IRNEV1TLD 0.9071 12.4 73002 AIRPORT 18.0 1.0050 115.6 Iron Mountain at 14.7 MW load: 7201 IRNMNTN 73433 WINIDSORT 1.0030 115.3 82.9 11.2 1 92 ..8 11 2 Bus # 7201 IRNMNTN 115.00 Tyre 1 Area 73 WAPA R.M. Zone 754 ZoNEFH Voltage 1.0034'1 Pu 115 392K Angle (deg) -0,19 75 0 37.8 168 0 24.2 1.0034 115.4 AP" 1 1 80 es.Cf 7202 685,5 IRNMTLD 37.6 0.9037 12,4 168.0 24.2 73002 AIRPORT 1.0041 115.5 Compute Settings Resolution t1,33 ak ak Magnetic. Field Probe Height 3.28 Electric. Field Probe Height 7.1 23 Radio Interference Probe Height 16.56 Radio Interference Frequency � :1 Object Rotation Skip Contact Current Calculation ir Fair 0.0 5.00 Rain ak ak ak 0 ilr ak 10 ak (ft) (ft) eft) (ft) (MHz) (dBplillft) OBA1.20pPa")) 4 TRI-STATE GENERATION AND TRAN5AAISSION ASSOCIATION, INC. HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233-0695 303-452-6111 POSITION STATEMENT Electric and Magnetic Fields (EMF) Electric and magnetic fields (EMF) are found wherever there is a flow of electricity, such as in the use of electric lights, appliances, computers, power lines, home wiring and any other devices that carry or use electricity. The Earth itself also creates natural EMF in varying amounts. Therefore, we are all continuously exposed to EMF as a result of living in a society that so heavily relies on the use of electricity as a source of energy. Some members of the public have raised concerns about EMF and health issues. We at Tri- State Generation and Transmission Association are aware of these concerns and we wish to express our position on EMF and our commitment to this matter. Over the past four decades, thousands of scientific studies on EMF have been conducted around the world. This very large body of research has been evaluated by leading public health organizations, such as the World Health Organization (WHO) and the U.S. National Institute of Environmental Health Sciences (NIEHS). The WHO currently concludes that "despite extensive research, to date there is no evidence to conclude that exposures to low level electromagnetic fields is harmful to human health." The U.S. NIEHS reached a similar conclusion in an earlier report, finding only "weak" and "marginal" evidence that EMF from electric power could affect health. The U.S. government has not recommended the standards for public exposures to electric power EMF. The WHO has endorsed the exposure limits adopted by the International Commission on Non -Ionizing Radiation (ICNIRP) and the International Committee for Electromagnetic Safety (ICES). These limits are 2,000 mG (ICNIRP) and 9,040 mG (ICES). The EMF levels that members of the public could experience from Tri-State power lines are well below these recommended exposure limits. Tri-State recognizes its responsibility to provide wholesale electric service at the lowest possible cost in a manner that is safe, reliable and environmentally sound. This responsibility includes designing and locating our facilities in accordance with the National Electric Safety Code and applicable federal, state and local regulations. In addition, even though electric power EMF have not been shown to cause adverse health effects, we will continue where reasonable and practicable to design and operate new facilities in a way that will lower EMF from those facilities. Tri-State continues to support credible scientific research on EMF as a sponsor of the EMF research program of the Electric Power Research Institute. We will continue to monitor the results of these and other scientific studies, will provide information about EMF issues to our member systems, our employees and our electric consumers and will respond promptly to inquiries. 4/2018 TRI-STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. ENVIRONMENTAL PROTECTION MEASURES FOR CONSTRUCTION PROJECTS TOPIC No. STANDARD ENVIRONMENTAL PROTECTION MEASURES - General G-1 the The regulations. contractor protection Prior of shall cultural to comply construction, and with ecological all all federal, supervisory resources. state and construction local environmental personnel laws, will orders be instructed and on G-2 Prior sensitivity present to construction, within during construction. the Tri-State Project shall area, discuss and, in with particular, the Contractor those areas areas where of environmental a monitor must be Access Routes AR -1 No adequately 4-6 wet excess construction construction inches to adequately of deep 1 support inch equipment. activities for support deep equipment a distance on will construction graveled be and of performed 10 vehicles. roads, feet equipment. on the during native If roads equipment periods surface If shall equipment be when or roads, deemed vehicles the the or soil vehicles soil to create is wet shall too to ruts create wet support be in to excess deemed ruts in too of AR -2 Only routes is growth adequate safe necessary, the operation and of minimum vegetation. working the topsoil safe of the amount width and transmission will Vegetation reliable and be of conserved turning soils operation and will line. radius be vegetation and cleared of reused space transmission from necessary as for cover those maintenance line on areas for will the disturbed be necessary equipment maintenance disturbed. areas to to and obtain If of excavation facilitate allow the access for re- the Aesthetics A-1 the the The construction permanent excavation natural contractor's contractor surroundings works, operations, operations shall construction approved exercise so vegetation as in the care to temporary operations vicinity prevent to shall preserve of or be and any the permanent preserved unnecessary work. equipment. the natural Except construction and landscape destruction, shall where clearing be and roads, protected scarring shall is staging required from conduct or areas damage defacing for or of by A-2 landscape The be repaired contractor resulting by shall the contractor minimize from construction scarring, to the satisfaction operations defacing, of damage and Tri-State. any or destruction unnecessary of or unauthorized the natural shall A-3 All manner. will removed construction not be Burning allowed. from the materials, or right-of-way. burying All materials waste of and waste resulting debris materials shall from the on be the removed contractor's right-of-way from clearing or the at project the operations construction area in shall a timely site be A-4 Structures impacts minimum whenever necessary will be located possible. to allow and Leveling structure designed and assembly to conform benching with and of erection. the the structure terrain and sites with will minimal be done visual to the Air Quality AQ-1 The control, contaminants. contractor prevent shall and utilize otherwise practicable minimize methods atmospheric and devices as are emissions or discharges reasonably available of air to AQ-2 Possible water to construction all disturbed related areas along dust the disturbance right-of-way shall and be controlled access roads. by the periodic application of AQ-3 Vehicles adjustments adjustments and equipment or or other repairs inefficient are showing made. operating excessive emission conditions shall of exhaust not be gases operated due until to poor engine corrective AQ-4 Post and completion occurs. blowing seeding of dust. mulch project The will activities be mulch/stabilization utilized to minimize during reclamation will potential be performed activities fugitive dust to as soon generation help reduce as possible as wind after re -vegetation erosion Biological Resources BR -1 Vegetation maximum access and shall extent construction be practicable. preserved There and Removal will protected be of no clear brush from and cutting damage trees within will by the construction be right-of-way limited to operations those unless necessary specifically to the for approved in writing by Tri-State. BR -2 that Disturbed preparation during potential the a potential recognized erosion areas techniques, where for would soil planting vegetation reseeded prohibit erosion season. is vegetation has increased to an Mulching been approved establishment removed to shall a detrimental seed be by applied construction mixture, and level and only growth. will to mulched activities be those subject if areas to necessary the to seedbed where extent BR -3 the The contractor banks of shall a river not or stream), cross any unless wetland at designated and riparian areas locations (of designated or relating by to, or Tri-State located on, BR -4 On regraded, are prevent completion left in erosion. as a of required, condition the work, so that that all will facilitate work all surfaces areas, natural drain except revegetation, naturally, any permanent blend provide with access the for roads/trails, natural proper drainage terrain, shall and and be BR -5 All mixes disturbed as specified areas, except by Tri-State. the access route running surfaces, will be reseeded with seed BR -6 All construction materials and debris shall be removed from the project area. BR -7 In order Avian Committee Guidelines conductor Protection to preclude (APLIC published clearances. Plan avian (APP) December April electrocutions 2005 standards 2006) (APLIC developed and and USFWS and minimize USFWS to by the protect collision 2005), Avian birds and risk, Power NESC on Tri-State power Line which Interaction lines, will specifies incorporate APP electric Cultural Resources CR-1 in Prior of cultural the to location construction, resources if cultural all with supervisory reference resource items construction to relevant are discovered. laws personnel and penalties, will be instructed and the need on the to cease protection work CR-2 Should construction, discovery assure any compliance left previously all intact land the altering until unknown National such activities time historic/prehistoric Historic that at Tri-State that Preservation location is sites notified will Act or artifacts be immediately and and appropriate enabling be encountered legislation. suspended measures during and taken the to Fire Prevention/Control FP -1 Construction vehicles shall be equipped with government approved spark arresters. FP -2 The response contractor providers shall maintain and methods in all of construction contact/communication. vehicles a current list of local emergency Hazardous Materials HM -1 to Tri-State enacted State 2601, Tri-State biphenyls, etc.) required 1980, government or the state shall et in section authorized excess or seq.) government. shall property by 40 promulgated comply the as CFR 102b. comply with of Comprehensive a the result officer (See with regard 761.1-761.193.). reportable A with copy the 40 of regarding concurrent all to CFR, a Toxic reportable any of applicable any toxic Part quantity Environmental Substance toxic report with 702-799 Additionally, substances release substances the federal established required filing Control and Response, or laws that any spill of especially, or or the Act by and release requested of hazardous are reports of 40 any regulations 1976, used, CFR, Compensation toxic provisions of to generated toxic by as Part the materials. any substance amended involved existing substances 117 federal on shall and by polychlorinated or In shall (15 or Liability agency federal hereafter any be stored U.S.C. (leaks, reported be event, furnished agency Act or on spills, as state Tri- of HM -2 All federal so fuel appropriate and spill fluid reporting spills notifications and within this response can area will requirements. be made be to regulatory handled Contractor in accordance authorities. shall with notify appropriate Tri-State of state any spills and HM -3 Any facility. minimal. federal waste Solid hazardous All generated hazardous waste material generated as a materials result statues during of will the and be construction proposed regulations. handled action and in accordance will periodic be properly maintenance with applicable disposed periods local, in a permitted will state be and Land Use LU-1 line, All cross-country approval activities and substation by associated Tri-State. travel will will with take not the be place allowed construction, within outside the operation authorized of the authorized and limits. maintenance Additional routes prior of access the to transmission review routes or and LU-2 the The Any contractor contractor fence, brace to shall panel appropriate maintain or gate all landowner damaged fences, brace during or agency panels construction standards and gates will as during determined be repaired the construction immediately by the authorized period. by officer. LU-3 The detrimental equipment. approved similar facilities contractor land shall manner. to Such use shall agricultural be ruts features restored Damage eliminate, shall shall operations as be to nearly at leveled, ditches, be the corrected as earliest and/or filled tile practicable drains, opportunity, hazardous and as necessary graded, culverts, to their to or all by original construction movement otherwise terraces, the contractor. condition. local of eliminated ruts vehicles roads The that in and land are and an other and LU-4 Structure secured falling through in foundation place and and into holes will a will be hole. strong not be enough left open to overnight prevent livestock, and will wildlife, be covered. or the Covers public will from be Noise N-1 Construction shall engine be equipped enclosures). vehicles with and manufacturers' equipment shall standard be maintained noise control in proper devices operating or better condition (e.g. mufflers, and Noxious Weeds NW -1 the than To measures prior from This used minimize chance to departure one the method for size reclamation will work introduction of of promotes be site weed the performed: from to seed work another activities the containment of dispersal site. noxious equipment All is Equipment will heavy not be weed recommended, by of storage drainage certified equipment weed seed will seeds facility. have weed sources of utilized as water accumulations on -free. the Washing on to -site off during the of work washing the project construction of site; equipment site, of mud all area of across seed equipment `knocked the mixes will prior an following be area to increases off' and washed transport greater instead. mulch Soils and Geology S-1 The equipment, contours fields). contractor The and by specific 2.) shall 1.) reseeded loosened mitigate seed mix(s) and with soils compacted leveled certified and rate(s) harrowing weed of -free by application movement or grasses disking will of and to be construction approximate mulched determined (except vehicles pre by -construction Tri-State and in cultivated . S-2 Movement approved of access construction routes. vehicles and equipment shall be limited to the property and S-3 transported Excavated evenly regraded spread to material off approximate on -site the not access to a used Tri-State pre in routes -construction the approved backfilling in the immediate disposal contours of poles and vicinity location. shall reseeded be of Disturbed spread the as pole specified around structure areas each shall in or S-1.* pole, then be S-4 Topsoil for maintenance will be removed, access.* stockpiled, and re -spread at temporarily disturbed areas not needed Traffic T-1 local The possible contractor traffic obstruction safety shall standards make and inconvenience all necessary and shall conduct provisions to public construction traffic. for conformance operations with federal, so as to offer state the and least Water Quality and Erosion WQ-1 into Construction spillage pollutants sanitary aggregate flowing of waste, and solid streams processing activities wastes matter, industrial or shall dry include, tailings, contaminants waste, be water performed but radioactive mineral courses, are debris, not salts by lakes restricted substances, and methods and and thermal other underground to, that objectionable refuse, oil pollution. prevent and garbage, other water entrance pollutants petroleum sources. cement, or accidental and Such concrete, products, wastes WQ-2 Dewatering on, appropriate streams settling streams or ponds state watercourses work or water or for agencies. other structure courses approved Water by constructing foundations shall methods. not and be eroded intercepting or performed earthwork materials without ditches, operations will prior be bypass prevented approval adjacent channels, from by to, Tri-State or encroaching entering barriers, and the WQ-3 Borrow abandoned, shaped giving a pits to natural shall carry the sides the appearance. be so natural of excavated borrow contour Waste pits that shall of piles water adjacent, be shall will brought not undisturbed be shaped collect to stable to and terrain slopes, provide stand into a therein. with the natural slope pit Before or appearance. intersections borrow being area, WQ-4 itself. Excavated on stream away by high material banks, water lake or other shorelines or storm construction runoff or other or materials water can in any shall course way encroach not perimeters be stockpiled upon where the or they actual deposited can water be near washed source or WQ-5 Waste waters from construction operations shall not enter streams, water courses or other surface waters without use of such turbidity control methods as settling ponds, gravel -filter entrapment dikes, approved flocculating processes that are not harmful to fish, recirculation systems for washing of aggregates or other approved methods. Any such waste waters discharged into surface waters shall be essentially free of settleable material. Settleable material quiescent is defined period. as that material that will settle from the water by gravity during a 1 -hour WQ-6 A Storm Water Management Plan shall be developed if required, to address all construction, reconstruction activities. The plan shall conform will all EPA and Best Management Practices (BMP) requirements. TR I STAT E CONTRACT EXECUTION AUTHORIZATION "°"A°«tVTn"rnr"°° DELEGATION AGREEMENT I, H. Steven Gray, hereby acknowledge Tri-State's trust and empowerment in me as an authorized agent to safeguard and protect Tri-State's rights, obligations, liabilities, expenditures, and assets. I understand my contract execution authority is limited to Environmental Permit Applications, Environmental Reports, and related submittals for transmission facilities. I have read and understand the terms and conditions of and agree to comply with the Contract Execution and Delegation of Signature Authority Program and Procedure. I further understand that improper use of this authority may suit in revocation of authority and disciplinary action up to and including termination of employe e :.t By: Na: Title: emor MaFiager, Lan g is and Permitting evert ay Date: I I jag 1,07A7,,,Z The authority to sign co racts as set forth above is hereby delegated to H. Steven Gray. Tri-State Ge By: Name.. an Hi _ - y Title: Chief Executive Officer d Transmission Association, Inc. Date: / 27/72-2._ Signature block format for these agreements: Tri-State Generation and Transmission Association, Inc. By: Name: H. Steven. Gray Title: Senior Manager, Land Rights and Permitting QTR-STATE Contract Execution Generation and Transmission Association, Inc. Association, Inc_ Program Subject: Related Contract Delegation Execution of Authority and Date Effective: 4/1/12 Relates to Corporate Policy No.: C-30 Revised: 6/14/2024 Program Owner: Senior Vice President and General Counsel Approved 4i i (SVP or Program Owner): Governance Documents: Corporate Policy C-30, Leadership, Strategy and Delegation Policy Program Owner: Senior Vice President and General Counsel Purpose: To establish a program for execution of contracts, including delegation of authority to execute contracts. Applicability and Responsibility: All Tri-State staff who sign contracts on behalf of Tri-State are subject to this program. Before signing a document on behalf of Tri-State, it is incumbent upon all employees to determine if the document is a contract. Contracts cone in many forms with a variety of titles, so it may not be apparent that you are signing a contract. If you are uncertain, then consult with an attorney in the Legal Department. Program: Contract Review. Prior to execution, all contracts must be reviewed by the Tri-State Legal Department unless the contract falls into one of these exceptions: 1) the contract is patterned verbatim without exceptions or changes to a Legal Department approved template, or 2) a Supply Services contract, requisition, or purchase order processed in accordance with the Contract Review for Supply Services (Procurement) Program. Delegation. The Chief Executive Officer (CEO) may delegate signature authority for contracts pursuant to governing documents noted below and in accordance with this program. Through this program the CEO delegates the following authority: 1. Executives. The executives listed on the attached Schedule 1 are authorized to sign contracts valued at or below $1,000,000.00, including all amendments and change orders, if the subject of the contract is within the purview of the executive's functional area. 2. Supply Services Department employees are authorized to sign contracts for the procurement of goods and services in accordance with the subject of the contract and the amounts stated on the attached Supply Services Contract Execution Authority Limits (Schedule 2). 3. Tri-Staff holding positions listed on the Energy Risk Program are authorized as provided therein. 4. The CEO may delegate his/her signature authority to Tri-State staff for purposes and situations not listed above by completing the attached Exhibit A, and providing a copy to the Corporate Records Department and to the Legal Department to post on the Legal Intranet Page 1 Site. Verification of Signature Authority to other Parties. If you need to verify your signature authority to another party, you may also consult the Legal Department for assistance. You may provide this program and a signature delegation that may be specific to you. If another party requests or you believe it helpful to provide more, do not provide other documents such as board policies without clearance from the Legal Department. Governance Documents. The documents that govern Tri-State signature authority and/or provide specific delegation from the board to individuals include Tri-State's bylaws, board policies, board resolutions, corporate policies and programs, and signed contract execution authorizations. Consequences. Violation of this program is grounds for disciplinary action, up to and including termination of employment. Page 2 Tri-State Generation and Transmission Iron Mountain Delivery Point Nearby Substations This map includes confidential information of Tri-State and possibly thud parties. The user agrees to keep this map and the GIS data included within it confidential, and more specifically, user will not duplicate, forward, se/I, or otherwise disclose this map or any of the data contained within it to thud parties. Tri-State makes no representation or warranty whatsoever regarding the accuracy or completeness of this map or the data contained within it. Users are encouraged to Independently verify Tri-State GIS data and are solely responsible for such verification. Al information depicted on this map is subject to revision as better data is made avarlabie. Questions regarding this map or the GIS data contained within it should be directed to Tri-State's GIS Manager nommen! Path 11hgstorelgeostoreTroductslCapitalProjects1CP99$5_IronMountain_SuMapslArcGlSPro_ProjectsklronMountainMaps.aprx Notice of Inquiry Weld County Department of planning Services Pre -application case # PRE24-0188 Date of Inquiry 6/25/24 Municipality Johnstown CPA Marne of Person Inquiring Selina Koler Property Owners pima Partners LLC Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst weld.gov Legal Description The N E4 of Section 7, T5N, R07W Parcel Number 147130100100 Nearest Intersection CR 15 and CR 00 Type of Inquiry 1041 USR for a substation The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary.. an -9"C County Planner's signature Would you like to pu sue nnex tion of this property? NO/ YES Date of Contact "rage 9'61 Comments: rt tiql/161 41e Litr's arfurale is. ES i tiacji Cie • r 1 \ ici- to34Akek t i c t Ave ii Si 3`r title Da a of` �nieipal y esentative acker c y Please sign and date to acknowledge that the applicant has contacted you and return this signed farm to Weld County Department of Planning Services. Department of Planning Services 1402 N 17th Ave, PO Box 7581 Greeley, CO 80632 97O -40O -61O0 I www.weld.gov 20230310 Notice of Inquiry Weld County Department of Planning Services Pre -application Case # PRE24-0168 Date of Inquiry 6/25/24 Municipality Windsor CPA Name of Person Inquiring Selina Koler Property Owners Vima Partners LLC Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weld.gov Legal Description The NE4 of Section 7, T5N, R67W Parcel Number 147130100109 Nearest Intersection CR 15 and CR 60 Type of Inquiry 1041 USR for a substation The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. n County Planner's signature Would you like to pursue annexation of this property? NO X Date of Contact 7/11 /24 Comments: The property is within the Town of Windsor GMA and the future land use designation is "Recreation Open Lands". The parcel has a 1/6 contiguity with the Town boundary. The proposal does not warrant annexation; however, may warrant a pre -annexation agreement concerning the access on CR 17, which is a Town roadway. The Town would reevaluate pursuing annexation if and when additional development of the property is proposed. Questions: What is the planned footprint of the facility and the height? ._. J Chief Planner 7/16/24 YES Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Department of Planning Services 1402 N 17th Ave, PO Box 758, Greeley, CO 80632 970-400-6100 I www.weld.gov 20230310 Weld County Treasurer Statement of Taxes Due Account Number R6787442 Legal Description NE47567 Account: 86787442 VIMA PARTNERS LLC 1625 PELICAN LAKES PT STE 201 WINDSOR, CO 80550-6236 Year 2023 2023 2023 Charges DELINQUENT FEE Interest Tax Grand Total Due as of 12/30/2024 Tax Billed at 2023 Rates for Tax Area 2408 - 2408 Authority WELD COUNTY SCHOOL MST RE4-WINDSOR NORTHERN COLORADO WATER (NC WINDSOR -SEVERANCE FIRE AIMS JUNIOR COLLEGE CLEARVIEW LIBRARY Taxes Billed 2023 * Credit Levy Mill Levy 12:0240000 44_3820000 1.0000000 8.2500000 6.3360000 3.5460000 75.5380000 Parcel 095707100001 Billed $5.00 $57.42 $2,871.20 Amount $457.03 $1,686.96 $38.01 $313 58 $240.84 $134.78 $2,871.20 Situs Address Payments $5.00 $57 42 $2,871.20 Balance $0.00 $0.00 $0.00 $0.00 Values AG -FLOOD IRRRIGATED LAND AG -WASTE LAND Total Actual $143,877 $98 $143,975 Assessed $37,980 $38,010 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 Weld County Treasurer's Office 1400 N 17th Avenue PO Box 458 Greeley, CO 80632 Phone: 970-400-3290 Pursuant to the Weld County Subdivision Ordinance, the attached Statement of Taxes Due issued by the Weld County Treasurer are evidence that as of this date, all current and ye ar ear p taxes related to this parcel have been paid in full. Signed: Date: Hello