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Terrapower CP Env Docs - Terrapower, Kemmerer Power Station Unit 1, Lincoln County, Wyoming, Large Construction General Permit Application, NOV 11, 2024
	ML25024A136
Person / Time
Site:	Kemmerer File:TerraPower icon.png
Issue date:	01/24/2025
From:	; NRC
To:	; NRC/NMSS/DREFS
References
	Download: ML25024A136 (38)
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William Burris Sent:

Friday, January 24, 2025 12:10 PM To:

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Subject:

TerraPower, Kemmerer Power Station Unit 1, Lincoln County, Wyoming, Large Construction General Permit Application, NOV 11, 2024 Attachments:

NPDES Large Construction General Permit.pdf William K. Burris, P.G.

Environmental Project Manager Environmental Center of Expertise Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Rockville, MD william.burris@nrc.gov 301-415-1621

Hearing Identifier:

TerraPower_NSFREnvDocs_Public Email Number:

12 Mail Envelope Properties (MW4PR09MB894812E883FE27BA4E632D698DE32)

Subject:

TerraPower, Kemmerer Power Station Unit 1, Lincoln County, Wyoming, Large Construction General Permit Application, NOV 11, 2024 Sent Date:

1/24/2025 12:09:52 PM Received Date:

1/24/2025 12:10:12 PM From:

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"TerraPower-NSFREnvDocsPUBLICem Resource"

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MW4PR09MB8948.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 292 1/24/2025 12:10:12 PM NPDES Large Construction General Permit.pdf 19362875 Options Priority:

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15800 Northup Way, Bellevue, WA 98008 www.TerraPower.com P. +1 (425) 324-2888 F. +1 (425) 324-2889 TP-LIC-LET-0359 November 11, 2024 Anita Rehner Wyoming Department of Environmental Quality Storm Water Program Coordinator 200 West 17th Street Cheyenne, WY 82002 Anita.Rehner@Wyo.Gov, (307)777-5622

Subject:

Kemmerer Power Station Unit 1, Lincoln County, Wyoming, Large Construction General Permit Application

Dear Ms. Rehner:

US SFR Owner, LLC (USO), a wholly owned subsidiary of TerraPower, LLC (TerraPower), is proposing to construct and operate a Natrium Reactor Plant, Kemmerer Power Station Unit 1 (Kemmerer Unit 1 or Project), in Lincoln County, Wyoming. The Natrium reactor is a TerraPower and GE-Hitachi technology. Kemmerer Unit 1 is based on TerraPowers Natrium reactor, an 840 megawatt thermal pool-type sodium-cooled fast neutron spectrum reactor that contains a molten salt energy storage system which enables the plant to vary its supply of electrical energy to the grid, up to 500 megawatts electric net, while maintaining constant reactor power. This innovative combination creates an integrated energy solution that provides clean, firm generation for electricity grids that have a growing mix of renewables.

Construction is scheduled to begin next year in Lincoln County, Wyoming. Enclosed is a Notice of Intent, Storm Water Pollution Prevention Plan (SWPPP), Construction Facilities Plan, Erosion and Sediment Control Plan, Clearing and Grubbing Plan, and Soil Erosion & Sediment Control Typical Details Sheet.

Date: November 11, 2024 Page 2 of 2 15800 Northup Way, Bellevue, WA 98008 www.TerraPower.com P. +1 (425) 324-2888 F. +1 (425) 324-2889 On the Notice of Intent, the start date is the requested effective date of the permit.

Construction is anticipated to start March 2025 and will continue for several years. An effective date of March 1, 2025 is requested for the permit. A renewal of the Large Construction General Permit would occur before August 2025, when the permit coverage would expire.

If you have any questions regarding this submittal, please contact Erin Wisler at c-ewisler@terrapower.com or (301) 922-2930.

Sincerely, Tara Neider Senior Vice President and Project Director TerraPower, LLC

Enclosures:

1.

Notice of Intent 2.

Storm Water Pollution Prevention Plan 3.

Construction Facilities Plan 4.

Erosion and Sediment Control Plan Sheet 1 5.

Erosion and Sediment Control Plan Sheet 2 6.

Clearing and Grubbing Plan 7.

Soil Erosion & Sediment Control Typical Details Sheet cc:

Erin Wisler, TerraPower Olu Omotowa, TerraPower Katherine Plasket, Bechtel Mark Romano, Bechtel Jeremy Carlson, Bechtel Kyra Perkins, Bechtel Lynn Van-Derpoel, Bechtel TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

NOTICE OF INTENT TO REQUEST DISCHARGE AUTHORIZATION FOR STORM WATER FROM LARGE CONSTRUCTION ACTIVITIES (Under Large Construction General Permit WYR10-0000)

Please print or type.

All items must be completed accurately and in their entirety or the NOI will be deemed incomplete and will be returned. A complete SWPPP must be submitted before the NOI will be processed.

Storm water discharges are covered under the large construction general permit when the Administrator provides a letter of authorization (LOA) to the applicant (see Part 1.2.4 of the permit).

Permit fees must be submitted with this NOI. See item 2 below.

An original signature of the applicant is required. Faxes or emails cannot be accepted.

For Renewing Existing Coverage Only:

Check here only if you are extending an early expiration date on existing coverage because your construction site is not finally stabilized. Please provide your current authorization number.

Authorization WYR10__________

1.

Contact Information:

Permit Applicant Company Name:

Legally Responsible Person:

(See Item 9 below for description)

Mr.

Ms.

Title:

Mailing Address:

City, State, ZIP Code:

Telephone:

Email:

Local Facility Contact Same as Applicant Company Name:

Local Contact Name:

Mr.

Ms.

Title:

Mailing Address:

City, State, ZIP Code Telephone:

Email:

Official Use Only Date received:

US SFR Owner, LLC.

Senior Vice President and Project Director Senior Vice President and Project Director Senior Vice President and Project Director Senior Vice President and Project Director 15800 Northrup Way 15800 Northrup Way 15800 Northrup Way 15800 Northrup Way Bellevue, WA 98008 Bellevue, WA 98008 Bellevue, WA 98008 Bellevue, WA 98008 410-507-0626 410-507-0626 410-507-0626 410-507-0626 tneider@terrapower.com tneider@terrapower.com tneider@terrapower.com tneider@terrapower.com Bechtel Power Company Bechtel Power Company Bechtel Power Company Bechtel Power Company Construction Coordinator Construction Coordinator Construction Coordinator Construction Coordinator 12011 Sunset Hills Rd Ste 100 12011 Sunset Hills Rd Ste 100 12011 Sunset Hills Rd Ste 100 12011 Sunset Hills Rd Ste 100 Reston, VA, 20190 Reston, VA, 20190 Reston, VA, 20190 Reston, VA, 20190 571-262-0921 571-262-0921 571-262-0921 571-262-0921 jecarlso@bechtel.com jecarlso@bechtel.com jecarlso@bechtel.com jecarlso@bechtel.com Tara Neider Tara Neider Tara Neider Tara Neider Jeremy Carlson Jeremy Carlson Jeremy Carlson Jeremy Carlson

2.

WYPDES Permit Fee Applications under the WYPDES program must include payment for permit fees with the application or notice of intent. See the WYPDES fee page at https://wywaste.wyo.gov/calc/wypdesfeecalc.html for more information and to find the fee calculator. Please provide the following information to verify your permit fee amount.

NOI date (date you expect to submit the NOI):

Month and year you wish coverage under the LCGP to expire (not to exceed 8/1/2025).

LCGP coverage must be maintained on this project until the project no longer requires permit coverage (i.e., the project reaches finally stabilized condition - see Part 2.9 in the permit for a definition). Permittee must renew coverage if the project is not finally stabilized by this date:

Submit NOI plus attachments and pay permit fee online at http://deq.wyoming.gov/wqd/ OR submit NOI and attachments by mail or in person and pay fees by check or cash (address below).

Amount remitted:

3.

Wyoming Conservation Executive Orders 2019-3 and 2020-1 See Part 8 of the LCGP for more information on how these Executive Orders may apply to your project and additional information regarding compliance and contacting the Wyoming Game and Fish Department with further questions.

Sage Grouse. Pursuant to the Wyoming Governors Executive Order (EO) 2019-3, applicants must determine if any part of their project is in Sage Grouse Core Area (SGCA), Connectivity Area, Winter Concentration Area, or within two miles of a Non-core Area Sage Grouse Lek as determined under the Executive Order. If your project meets any of these conditions, the applicant must consult with the Wyoming Game and Fish Department (WGFD) and obtain a letter confirming consistency with the EO. That letter will be required to process your application.

Some part of my project does fall within the area described and I contacted the WGFD for a consultation.

A letter from the WGFD confirming consistency with Executive Order 2019-3 is attached.

No part of my project falls within the described area No additional requirements. Complete and submit your Notice of Intent.

Migration Corridors. Pursuant to Wyoming Governors EO 2020-1, applicants must determine if any part of their project falls within a Migration Corridor designated under this EO. If your project does, you must consult with the Wyoming Game and Fish Department (WGFD) and obtain a letter confirming consistency with the EO. That letter will be required to process your application.

Some part of my project does fall within the area described and I contacted the WGFD for a consultation.

A letter from the WGFD confirming consistency with Executive Order 2020-1 is attached.

No part of my project falls within the described area No additional requirements. Complete and submit your Notice of Intent.

4.

Project

Description:

Briefly describe the project:

Area that your project will disturb during construction in acres:

Total disturbed area of the larger common plan of development or sale (if applicable):

Date construction is planned to start:

Date final stabilization is expected:

$200

$200 The Natrium Demonstration Project (Kemmerer Power Station Unit 1) incorporates a pool type reactor which uses liquid sodium as the coolant. The project area will consist of an energy island, nuclear island, construction laydown yards, storm water management areas, associated infrastructure for employees, transmission lines, and water pipeline.

The Natrium Demonstration Project (Kemmerer Power Station Unit 1) incorporates a pool type reactor which uses liquid sodium as the coolant. The project area will consist of an energy island, nuclear island, construction laydown yards, storm water management areas, associated infrastructure for employees, transmission lines, and water pipeline.

441 441 441 441 N/A N/A N/A N/A 3/2025 3/2025 3/2025 3/2025 Spring 2030 Spring 2030 Spring 2030 Spring 2030

5.

Project Information:

Project Name:

Project County(ies)

Project Location:

Provide the location as either section, township and range OR a street address. For linear projects such as roads or pipelines provide the locations of the endpoints.

If this is a linear project add ending location. If more space is needed attach additional sheet(s):

Latitude and longitude to a minimum of 5 decimal places:

If this is a WYDOT project, list project number(s) and WYDOT project engineer:

Access to facility and map of access route(s): As part of its application, the applicant shall certify under penalty of perjury that the applicant has secured and shall maintain permission for Department of Environmental Quality personnel and their invitees to access the permitted facility, including (i) permission to access the land where the permitted facility is located, (ii) permission to collect resource data as defined by Wyoming Statute § 6-3-414, and (iii) permission to enter and cross all properties necessary to access the permitted facility if the facility cannot be directly accessed from a public road. A map of access route(s) to the facility shall accompany the Notice of Intent and SWPPP.

6.

Receiving Waters and Municipal Storm Sewers:

Name(s) of the nearest defined drainage(s) which could receive runoff from the construction project, whether it contains water or not. Include bodies of water such as lakes and wetlands where applicable.

Will storm water discharge from the project enter a municipal storm sewer?

Yes No If so, what municipality?

To what water body does the storm sewer discharge?

Identify all water bodies that are within 2000 feet the construction site and that may receive flow from the construction site that are:

1. Listed on the states 303(d) report as impaired due to sediment, suspended solids or turbidity or

2. Have an approved TMDL for sediment, suspended solids or turbidity 7.

Attachments (failure to provide required attachments will result in return of the application package):

For all projects:

A complete SWPPP must be submitted with the NOI for all projects via the WDEQ upload link or via email

A map of access routes to the project that comply with the access requirements as defined in item 5 above.

Fees must be paid at time of submission. To determine the fee amount required for this application go to the fee calculator at https://wywaste.wyo.gov/calc/wypdesfeecalc.html. Payment may be online for uploaded applications or by check for mailed or delivered application packages. Make checks payable to the DEQ/WQD.

TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved Lincoln Lincoln Lincoln Lincoln Sec. 32, T. 21N R. 116W, Sections 2,11,12 T. 20N R. 117W, Sections 7,8,17,19,20 T. 20N R. 116 W Sec. 32, T. 21N R. 116W, Sections 2,11,12 T. 20N R. 117W, Sections 7,8,17,19,20 T. 20N R. 116 W Sec. 32, T. 21N R. 116W, Sections 2,11,12 T. 20N R. 117W, Sections 7,8,17,19,20 T. 20N R. 116 W Sec. 32, T. 21N R. 116W, Sections 2,11,12 T. 20N R. 117W, Sections 7,8,17,19,20 T. 20N R. 116 W N/A N/A N/A N/A 41.705841°N 110.560547 °W 41.705841°N 110.560547 °W 41.705841°N 110.560547 °W 41.705841°N 110.560547 °W LN-02A-48658 Darin Kaufman LN-02A-48658 Darin Kaufman LN-02A-48658 Darin Kaufman LN-02A-48658 Darin Kaufman North Fork Little Muddy Creek North Fork Little Muddy Creek North Fork Little Muddy Creek North Fork Little Muddy Creek N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 4

4 4

For any project that falls partly or completely within areas defined by EO 2019-3 (sage grouse) and/or EO 2020-1 (migration corridors):

Provide letter(s) from the WGFD confirming consistency with the relevant Executive Order(s).

Alternative inspection plans only.

Operators seeking approval for alternative inspection schedules at the beginning of their project must submit the project SWPPP and proposed inspection plan with their NOI. Approval for an alternative plan may also be requested later (see Part 10.5 in the permit).

8.

Copy of General Permit.

A copy of the general permit may be downloaded at http://deq.wyoming.gov/wqd/storm-water-permitting/resources/construction-general-permits/

9.

Certifications:

I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate, and complete. Additionally, I certify that I have secured and shall maintain permission for Department of Environmental Quality personnel and their invitees to access the permitted facility, including (i) permission to access the land where the facility is located, (ii) permission to collect resource data as defined by Wyoming Statute § 6-3-414, and (iii) permission to enter and cross all properties necessary to access the facility if the facility cannot be directly accessed from a public road. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Additionally, I certify that I am aware of the terms and conditions of the large construction general permit and I agree to comply with those requirements and any additional sage grouse or migration corridor Executive Order stipulations and operating restrictions or recommendations provided by the Wyoming Game & Fish Department for activities in areas subject to either or both executive orders.

Authorized signatories for this notice of intent are the following legally responsible persons:

For corporations:

A principal executive officer of at least the level of vice president, or the manager of one or more manufacturing, production, or operating facilities, provided the manager is authorized to make management decisions which govern the overall operation of the facility from which the discharge originates.

For partnerships:

A general partner.

For a sole proprietorship:

The proprietor.

For a municipal, state, federal or other public facility:

Either a principal executive officer or ranking elected official.

Printed Name of Legally Responsible Person Title Signature of Legally Responsible Person Date Section 35-11-901 of Wyoming Statutes provides that: "Any person who knowingly makes any false statement, representation, or TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved Senior Vice President and Project Director Senior Vice President and Project Director Senior Vice President and Project Director Senior Vice President and Project Director 11/11/2024 11/11/2024 11/11/2024 11/11/2024

certification in any application... shall, upon conviction, be fined not more than ten thousand dollars ($10,000) per day for each violation or imprisoned for not more than one (1) year, or both."

Preferred submission method: Upload application to https://bit.ly/3dbcKyy Permit fee payment must be made online.

Optional submission method: Mail this application to (payment by check or cash only):

WYPDES Storm Water Section DEQ/WQD 200 West 17th Street Cheyenne, WY 82002 DEQ use only:

Date payment recd:

Payment amount:

Permit term:

Approval:

NOI revised 9/20 c:\\bsahl\\storm_water\\construction\\cgp_2020\\lcgp-final-docs\\noi_lcgp_2020.doc TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

STORM WATER POLLUTION PREVENTION PLAN TEMPLATE PLEASE READ THIS PRIOR TO COMPLETING FORM: This SWPPP template is intended to help operators in developing a SWPPPP that complies with Part 9.2 of the Wyoming Department of Environmental Quality WYPDES Storm Water Program Large or Small Construction General Permit. The SWPPP is a site specific, dynamic plan designed to control erosion and sedimentation, prevent storm water contamination, and comply with requirements of the Clean Water Act. It is the permittees responsibility to ensure all required items in the Large Construction General Permit are adequately addressed, and that the SWPPP is developed, implemented, and maintained.

Project or Site Information:

Project Location as either Quarter/Quarter, Section, Township, Range OR Street Address and City:

Sec. 32, T. 21N R. 116W, Sections 2,11,12 T. 20N R. 117W, Sections 7,8,17,19,20 T. 20N R. 116 W Permittee (Legally Responsible Entity) Information:

Company Name:

US SFR Owner, LLC.

Legally Responsible Person Name:

Tara Neider Mailing Address:

15800 Northrup Way City, State, ZIP Code:

Bellevue, WA 98008 Phone Number:

410-507-0626 Permit Number: Not applied Part 9.2.1 SWPPP - Administrator:

Company or Organization:

Bechtel Power Corporation Name:

Katherine Plasket

Title:

Project Engineer Phone #:

571-392-6397 Email:

kgplaske@bechtel.com Part 9.2.2 - Site

Description:

9.2.2.1 Brief description of nature of the construction activity:

The Kemmerer Power Station Unit 1 (Kemmerer Unit 1) site will be composed of five primary areas: 1)

Nuclear Island (NI); 2) Energy Island (EI); 3) Site Infrastructure; 4) Kemmerer Training Center (KTC); and

5) Linear Facilities. Construction will begin with site establishment which involves surveying, clearing, Project/Site Name:

Kemmerer Power Station Unit 1 (Kemmerer Unit 1)

and grubbing. Next, excavation and backfill will be conducted to install piping and duct banks. Also, site works will include storm drainage, paving, site lighting and fencing. Storm drainage will be captured in a stormwater facility on site and then directed to existing drainageways. Laydown areas will be established for stockpiling materials. Shafts will be drilled for the reactor and sodium drain tanks which will be dewatered and lined with concrete from the onsite concrete batch plants. During groundwater removal, erosion will be contained and pumped groundwater will be disposed of according to permitted requirements. Permanent infrastructure will be installed such as plumbing, mechanical, and mechanical service lines. The nuclear and energy islands will proceed in parallel which will include operational buildings, offices, the KTC, and control buildings. Linear facilities consist of a macro utility corridor, overhead power transmission and water conveyance lines trending North from the Kemmerer Unit 1 complex, then west towards the Naughton Power Plant. The routing of pipelines in the macro-corridor is expected to avoid the wetlands, streams, roads, and railroads where practicable, and use construction techniques such as Horizontal Directional Drilling to minimize impacts to resources that cannot be avoided. All construction equipment will access the corridors at designated locations and be confined to approved areas of disturbance to minimize impacts to wetlands, waterways, and 100-year floodplains to the greatest extent possible. Land clearing debris and spoils and other construction waste will be disposed of in accordance with regulatory requirements. The final stage of construction includes the transformers and switchyard.

9.2.2.2 Proposed sequence of major activities and an estimated date final stabilization (defined in Part 2.9) is expected to be achieved.

Kemmerer Unit 1 construction activities are anticipated to begin March 2025 and continue year-round until Q4 2029. Revegetation will occur following construction completion in 2029, with expected final stabilization in spring 2030. There will be two plots on this project, one being the nuclear island and the other the energy island. The nuclear island will house the reactor and the energy island will house the electrical generation systems.

The major activities include the following and will be completed per approved drawings, specifications, permits, and local/state requirements:

Erosion controls Start Mar 2025

Kemmerer Training Center (KTC) construction Mar 2025 - Mar 2026

Clear and grub Start Apr 2025

Cut, excavate, grade, backfill Apr 2025 - Dec 2026

Install and test concrete batch plant Sep 2025Dec 2025

Concrete batch plant mixing (with foundations)

Jan 2026 - May 2028

Temporary fence Mar 2025 - October 2025

Underground commodities (storm drains, duct bank, piping)

Jun 2025 - Apr 2027

Install storm water ponds Sep 2025 - Feb 2026

Drilling of drilled shafts and excavation of site for substructure Apr 2025 - Apr 2027

Installation of concrete foundations Aug 2025 - Jun 2027

Installation of structural steel Aug 2025 - Jun 2027

Installation of mechanical equipment Oct 2026 - Oct 2028

Installation of electrical equipment Oct 2026 - Jul 2029

Installation of A/G piping systems Apr 2027 - Jul 2029

Installation of electrical commodities Mar 2026 - Nov 2029

Dewatering Dec 2025 - Jun 2027

Linear transmission system installation Apr 2027 - Mar 2028 9.2.2.3 Estimate of total area of the site: __845__acres and Estimate of total area of the site expected to undergo disturbance related to the construction activity including clearing, excavation, and grading as well as offsite borrow areas, access roads, areas for support activities and staging/storage areas. _441_acres 9.2.2.4 A description of storm water discharges from support activities dedicated to the construction site including, but not limited to, off-site materials borrow areas, concrete or asphalt batch plants, equipment staging yards, material storage areas and access roads constructed for the project.

Construction activities will consist of clearing, grubbing, and grading of the construction site. Also included will be the excavation and erection of structures associated with Kemmerer Unit 1 and the overhead power and water transmission macro-corridor. All grading activities will be within the construction area and its associated cut and fill slopes. There will be stockpiles located in select areas on the site. Equipment staging will be at locations within the Kemmerer Unit 1 construction area. Permanent stormwater management ponds will be used as sediment ponds during construction, and a permanent storm drain collection system will be installed.

All stormwater in the Kemmerer Unit 1 pad area will be collected in the storm drain system and discharged to the sediment ponds where the runoff will be detained and slowly released to existing drainages. These ponds are designed for a 2-year, 24-hour storm event during construction. The detention of the runoff will facilitate settlement of suspended sediment in the storage ponds. Discharges from areas outside the pad area are limited to sheet flow runoff from the laydown areas. Sheet flow runoff from these areas will be directed to existing drainage after treatment by sediment control Best Management Practices (BMPs).

9.2.2.5 Brief description of existing vegetation across the portion of the site to be disturbed. For vegetated areas also provide an estimate of the percent of the ground within that area that is covered by the leaf canopy of the existing plants (percent vegetative ground cover). (Pre-disturbance photos are helpful.):

The vegetation in the Project consists of sagebrush steppe and grassland upland communities. Dominant species include sagebrush (Artemisia tridentata ssp. tridentata; A. tridentata ssp. Wyomingensis), black sagebrush (Artemisia nova), yellow rabbitbrush (Chrysothamnus viscidiflorus), crested wheatgrass (Agropyron cristatum), and cheatgrass (Bromus tectorum). See photos of the pre-disturbance area below (Figure 1). The density of the majority of the vegetative ground cover is estimated between 23-36%.

Revegetation will be using WYDOT standard seeding, critana thickspike wheatgrass, secar snake river wheatgrass, nezpar indian ricegrass, canbar canby bluegrass, and v.n.s. bottlebrush squirreltail. Revegetation will occur at the end of the construction phase in 2029 and is expected to be completed by spring 2030.

Figure 1: Pre-Disturbance Site Photos 9.2.2.6 List the location and description of any other potential pollution sources including, but not limited to vehicle fueling, equipment maintenance, fertilizer storage, chemicals, or paint:

Within the Kemmerer Unit 1 construction area there will be the following:

Material stockpile/spoils area Construction trailers Bathrooms HAZMAT storage Waste dumpsters Concrete washout Concrete batch plants Concrete batch plant material storage Generators Periodic equipment and vehicle fueling with a mobile fuel truck 1200 Liter used oil tank Vehicle and maintenance service area Equipment storage areas Material warehouse Chemical storage Heavy equipment maintenance shop Fuel tank station, up to 2200 gallons Gas bottle storage Equipment storage and maintenance Tool Room 9.2.2.7a Name of the drainage or water body (surface water(s) of the state) that may receive a storm water discharge from the construction activity and the size, type, and location of any outfall. Note: Where discharges are to unnamed drainages, provide the name of the first named drainage that will receive that discharge if the first named drainage is within 1000 feet of the discharge:

Pre-development sheet flow drainage patterns will be maintained during and after construction activities. The sheet flow runoff from the construction access road is directed towards an unnamed tributary west of the construction site, which discharges to North Fork Little Muddy Creek at a location south of the construction site. This unnamed tributary is ephemeral, only containing flow during large rainstorm events or during the spring snow melt. Sheet flow runoff from the area will flow to the east and to the west. Sheet flows to the west TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

will also discharge to the same unnamed tributary, while sheet flows to the east will discharge to North Fork Little Muddy Creek. Flows in North Fork Little Muddy Creek are limited to discharges from the Naughton Power Plant located a few miles upstream. If not for the discharge from Naughton Power Plant, this creek would also be ephemeral, only containing flows during large rainstorm and snow melt events.

9.2.2.7b If the storm water discharge is to a separate storm sewer, indicate the name of the municipal owner of that system, the location of the storm sewer outfall, and the name of the drainage or water body that will receive the storm water discharges from the municipal outfall:

Municipal Separate Storm Sewer Systems (MS4) are not present within the project area.

9.2.2.8 Identify any water body listed as impaired under section 303(d) of the federal Clean Water Act due to sediment, suspended solids or turbidity or that has an approved TMDL for sediment, suspended solids or turbidity that is within 2000 feet of, and may receive storm water flow from the permitted construction activity. The states most recent 303(d) list can be found in the current Integrated 305(b) and 303(d) Report.

The report can be found on the WDEQ Water Quality Division Watershed Management website under Water Quality Assessment at: http://deq.wyoming.gov/wqd/water-quality-assessment/resources/reports/.

Approved TMDLs can be found on another webpage at http://deq.wyoming.gov/wqd/tmdl/resources/completed-projects/

No surface waters located within 2,000 feet of the project are listed as impaired by sediment, suspended solids, or turbidity as defined by the WDEQ Water Quality Division.

Part 9.2.3 -Site Maps.

One (or more) map(s) should be prepared that provide, at a minimum, the following information. The map(s) should be prepared so that all of the required information is clearly displayed and it is clear what BMPs will be installed in each major stage of construction, including the time between the cessation of active construction and final stabilization. Provide multiple maps as necessary to clearly describe BMP timing and placement. The scale of the map(s) must be sufficient to identify the location of all the items listed below:

9.2.3.1 Construction site boundaries.

9.2.3.2 All areas of soil disturbance and areas that are to remain undisturbed.

9.2.3.3 The location of surface waters of the state as defined in Part 2.21 of the Large Construction General Permit (LCGP).

9.2.3.4 Areas used for storage of building materials, soils, wastes, fuel, and concrete washout.

9.2.3.5 Locations of all existing or planned temporary or permanent erosion and sedimentation controls.

9.2.3.6 Locations of all other structural best management practices for pollutants other than sediment, including but not limited to, fueling/maintenance areas and concrete washout disposal areas.

9.2.3.7 Site topography or storm water drainage patterns including lines showing boundaries between different drainage areas in the project area(s).

9.2.3.8 Identify areas where disturbed soils may be highly erodible due to soil type and/or slope.

Such areas may be identified prior to construction or discovered and addressed during construction.

9.2.3.9 Areas where dedicated support activities (e.g. operations producing earthen materials such as sand and gravel, staging areas, portable asphalt or concrete batch plants) occur and are to be covered under the same general permit authorization as the construction activity. See Part 1.2.2 of the LCGP for more information on what can be covered under TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

an authorization. Activities covered under another WYPDES storm water authorization (such as a mineral mine with separate coverage) do not need to be included.

9.2.3.10 Storm water discharge locations. Show all points or areas where storm water will discharge from the site. Also include storm drain inlets where storm water entering the storm drain system may leave the construction site and any points where storm water will discharge directly to a surface water of the state within the construction site. Include discharge locations for offsite operations covered under this permit.

9.2.3.11 Also note all locations where storm water will run on to the construction site from areas outside the site boundaries.

9.2.3.12 Show the locations of any dewatering discharge points and all BMPs associated with dewatering.

9.2.3.13 North Arrow. Include a legend where needed for clarity.

Part 9.2.4 - Best Management Practices (BMPs)

Please note: Storm water structural best management practices are expected to withstand and function properly during precipitation events up to a 2-year, 24-hour storm event. Visible and measurable erosion (see Part 7.5 of the LCGP) that leaves the construction site from such storm events should be minimal. The 2-year, 24-hour storm event in Wyoming ranges from 0.8 to 2.6 inches. An isopluvial map of the 2-year, 24-hour storm depth (for your location) is available on the DEQ storm water website. Permittees may substitute equivalent data published by the local municipality or regulatory agency.

9.2.4.1 Erosion and Sediment Controls.

9.2.4.1a Erosion prevention BMPs. Clearly describe in detail the storm water erosion control BMPs that will be used for erosion control during construction related earthwork activities. Indicate the location of these measures on the site map required above, or a similar separate map. Examples of BMPs for erosion prevention include, but are not limited to preserving existing vegetation, scheduling (e.g., minimizing site disturbance at a given time), surface roughening, permanent or temporary seeding and planting, mulches, soil binders or tackifiers, erosion control blankets and mats, wind erosion control, storm water diversion practices upslope of a construction site, pipe slope drains, and outlet protection.

Erosion control measures during construction will consist of placement of permanent seeding on the pad cut and fill slopes. Riprap aprons will also be placed at the pipe outlet from the sediment pond and at the pipe outlets from the storm drain system into the sediment pond. Additionally, any areas of the access road that show evidence of erosion will be stabilized with crushed stone. To combat dust during earth-moving activities, the following measures will be taken: pre-apply and re-apply water as necessary to maintain soils in a damp condition, limit the amount of exposed areas through planning and timing of project phases, and stabilize stockpile materials.

Dust Control Plan The moisture content and size of exposed stockpiles will be monitored, and water will be applied on a regular basis for dust control. If stockpiles are not being frequently accessed, then they will be covered and stabilized.

A speed limit for construction vehicles will be implemented on unpaved and paved non-public roads within the construction site. Unpaved roads will be watered to maintain dust control. Paved roads will be swept and sprayed to reduce dust on roadways.

In the event that construction operations are shut down as a control method during a high wind event, watering of the area will continue, if appropriate, to minimize dust from crossing the property line.

9.2.4.1b Sedimentation Control BMPs. Clearly describe in detail the storm water sedimentation control BMPs that will be used for sediment control during construction related earthwork activities. Indicate the location of these measures on the site map required above, or a similar separate map. Examples of BMPs for sedimentation control include, but are not limited to sediment barriers such as straw bales, gravel berms, silt fences, fiber rolls, wattles; sediment traps and basins, storm drain inlet protection, entrance/exit tracking controls, undercut lots where curb and gutter are installed, vegetated buffer strips, grassed waterways, water bars, and water wings.

Silt fencing and straw bales will be placed along the entire length of the Limits of Disturbance (LOD) to prevent sediment laden sheet flow runoff from leaving the site. Silt fence will be installed around the perimeter of the project. The site team will inspect the silt fence as required by the Large Construction General Permit. Logs of issues and repairs will be maintained. The silt fencing and straw bales will filter out sediments from the runoff as it leaves the site. Two sediment ponds are placed on the eastern edge and one sediment pond on the southern edge of the Kemmerer Unit 1 pad area to collect all runoff from the Kemmerer Unit 1 pad area through an installed storm drain collection system. The sediment ponds will facilitate the deposition of suspended sediment from the site runoff before discharging from the ponds to existing drainage and eventually to North Fork Little Muddy Creek. Inlet protection measures will also be used during the construction phase at all catch basin inlets to limit the amount of sediment entering the ponds.

9.2.4.1c Stabilization Measures. Describe temporary and permanent stabilization measures such as the BMPs listed in the previous Erosion Prevention and Sediment Control sections for exposed soil areas where activities have temporarily or permanently ceased. Refer to Part 7.12 for additional information on stabilization requirements and timing. Please note: temporary or permanent stabilization measures are required in areas where further work is not expected for 14 days or more As described in Sections 9.2.4.1a and 9.2.4.1b, erosion and sediment control measures consisting of, silt fencing, straw bales, sediment ponds, riprap aprons, inlet protection, erosion mats, and permanent seeding will serve to stabilize the site during the construction phase. Silt fencing and straw bales will remain in place until the site is stabilized and permanent seeding has been applied to stabilize cut and fill slopes. Crushed stone on roads will remain in place after construction is complete.

9.2.4.2 Construction Site Dewatering. Clearly describe the specific BMPs that will be used for discharges from construction site dewatering. Discharges must meet the conditions specified in Part 7.11 of the LCGP including the use of settling or filtration techniques as appropriate and the use of velocity dissipation devices at the outlet.

There is potential for construction dewatering discharges during the construction phase of Kemmerer Unit 1.

Groundwater will be held onsite and used for construction activities, such as dust suppression and soil compaction. Dependent on pumped water quality, the groundwater will go into a settling pond or tank to minimize the turbidity. Riprap aprons will also be placed at the pipe outlet from the sediment ponds and at the pipe outlets from the storm drain system into the sediment ponds. Groundwater will be treated to meet permit limits prior to discharge to North Fork Little Muddy Creek. Alternatively, groundwater may be released to an existing suitable site facility or collected in tanks and disposed of in accordance with local regulation using appropriate licensed haulers. Anticipated groundwater discharges leaving the site to North Fork Little Muddy Creek will comply with the Wyoming Pollutant Discharge Elimination System (WYPDES), Temporary Industrial TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Discharge general permit. The general permit for temporary discharges authorizes discharge of wastewater to surface waters of Wyoming associated with construction dewatering of uncontaminated groundwater.

9.2.4.3 Operational Controls.

9.2.4.3a Good Housekeeping BMPs. Describe in detail the good housekeeping BMPs that will be implemented to maintain a clean and orderly facility. At a minimum, this plan shall address litter, debris, chemicals, fertilizers and sanitary waste. Include measures to remove sediment that has left the site.

Housekeeping requirements:

Housekeeping will be the responsibility of all site personnel. Management and supervisory personnel will demonstrate their commitment by emphasizing housekeeping during daily planning, personnel supervision, work execution, and daily maintenance of their assigned activities.

Project personnel will be trained on housekeeping and associated environmental, safety and health requirements (ES&H). Housekeeping will be part of the site inspections frequently performed by ES&H and supervisory personnel, inclusive of work and storage locations and sanitary facilities. Supervisory personnel will be advised promptly by ES&H regarding necessary improvements, with corrective actions documented during subsequent ES&H inspections.

The site facilities, trailers, and work areas will be kept organized, inclusive of material staging, access points, walkways, waste materials, stored materials, storage areas, sanitation facilities, and the like.

Accumulation of debris and refuse will be avoided.

Housekeeping and associated risks will be discussed at the start of the work shift with work crews prior to initiating tasks.

Adequate time and personnel will be assigned to assure that good housekeeping is maintained throughout the work shift. Crews will clean as they go rather than cleaning and organizing just at the end of the work shift.

Access and Egress Routes - Personnel will be provided safe access and egress to all work areas, sanitation facilities, and trailer space.

Cable, Cord, Hose and Lead Management - Proper management and control of electrical cables, cords, hoses, and leads within the worksite will be enforced.

Chemicals - All chemicals will be clearly marked. All chemicals will be stored in a clearly marked container when not in use. Chemical use will follow manufacturers directions or Safety Data Sheet (SDS) instructions.

Fertilizers - Use of fertilizers is not anticipated at this time.

Flammable and Combustible Materials - Materials of a flammable or combustible composition (e.g.,

solvents, rags, lubricants) will be stored in a covered fire-resistant waste container when not in use, and appropriate fire prevention tools will be made available (e.g., fire extinguishers, sand and buckets, shovel). Warning signs will be posted and will identify potential fire risks.

Materials, Tools, and Equipment Management - All work areas will be clear of debris and waste materials. Tools, equipment, and materials at the workplace will be kept to a minimum. Tools and equipment will be removed as soon as practicable so that the workplace is maintained in a clean and orderly condition. Packaging will be kept to the practical minimum.

Sanitary facilities - Facilities maintenance and sanitary waste disposal will be maintained by an assigned Subcontractor. Inspections by both the Subcontractor and Management will be performed to ensure cleanliness is maintained. Clean up of any spills from sanitary waste will be performed in TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

accordance with regulatory requirements. Portable toilets will be secured (such as staking or sandbags) to prevent tipping and blow overs.

Spills and Cleanup - Spills, such as those resulting from oil or fuel, will be cleaned up immediately.

Appropriate absorbents will be used based on the type of substance spilled and spill location and contained within a spill kit. Absorbents used to clean up spills will be removed and placed in closed and labelled containers for safe storage and disposal per regulatory requirements.

Waste Storage and Waste Management Areas - Storage areas will be identified clearly and separated from active work locations. Waste management will be performed by an assigned Subcontractor Examples of waste storage and management best practices include:

o Providing dedicated waste storage areas o

Not mixing regulated and non-regulated wastes o

Labelling all waste containers o

Only using containers that are in good condition, not leaking, and storing them on hard surfaces when possible o

Emptying containers regularly, and not allowing overflow o

Conducting regular inspections of waste storage areas o

Using covered containers and bins wherever possible and secondary containment for liquid wastes.

9.2.4.3b Bulk Storage of Petroleum Products. Describe in detail the specific practices for bulk storage of petroleum products at the site. (See Part 9.2.4.3.b of the LCGP for more information). An SPCC plan may also be referenced.

Bulk storage of petroleum products is anticipated at the project during construction. A storage area with appropriate containments will be established for temporary power. The SPCC Plan will cover petroleum products stored onsite as required by EPAs Tier I Qualified Facility SPCC Plan Template. Maintenance yards and areas will have proper stormwater management and containment to prevent impacts to drainage systems and off-site waterways. Spill kits will be kept in all oil/petroleum staging areas. Oil product containing tanks will have properly sized secondary containments. Aboveground self-contained oil tanks will be visually inspected by maintenance personnel by examining the outer shell inspection plug.

9.2.4.3c and d Concrete Waste. Clearly describe the specific practices that will be used to contain concrete wash waters, grindings or slurry from entering storm drains or surface waters of the state. Please note: Concrete grindings must be disposed of in accordance with the regulations and policies of the WDEQ Solid and Hazardous Waste Division. Include portable concrete batch plants and asphalt batch plants covered under this permit.

The concrete batching facility and concrete test trailer will be located onsite, southeast of the Energy Island.

The area will be prepared, cleared, and grubbed of vegetation; dirt levelized; and foundations and washout basin excavated. The installation of base slabs for the batch plant, storage silos, wash stations, and aggregate bins will also occur prior to use along with the setup of batch plant components and support trailers. Concrete waste from the washout basin will be disposed of per state and local regulations.

9.2.4.3e Employee Training. Describe employee training that will be provided to inform personnel of their responsibility in implementing the practices and controls included in the SWPPP.

All new hires will be trained as they are brought on as part of new hire orientation and all employees will be trained annually, as to their responsibilities in implementation of the SWPPP, including spill response, good housekeeping, and sediment control. Personnel assigned to installing and maintaining Erosion & Sediment (E&S) controls have documented training. Awareness campaigns will be used to alert employees and subcontractors about BMPs and requirements, including actions necessary prior to and following storm events.

9.2.5 Maintenance Maintenance Schedule. Describe the schedule or intervals and conditions upon which BMPs described in the SWPPP will be maintained. Please note: BMPs found to be in need of repair or maintenance shall be repaired or maintained in accordance with Appendix C, Part 2 of the LCGP. Repair and maintenance activities shall be documented and maintained in accordance with Part 10.7.

Any devices needing repair will be repaired within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of discovery (active site) or 14 days (inactive site) in accordance with Appendix C Part 2 of the LCGP. This also includes the removal of sediment from devices such as silt fence, wattles, and straw bales when it reaches 1/3 the height of the device (or per manufacturers specifications).

Any repair and maintenance activities shall be documented and maintained in accordance with Part 10.7.

9.2.6 Inspections Inspection Schedule. Describe in detail an inspection program and schedule that meets the requirements of Part 10 of the LCGP.

During active construction, qualified personnel shall inspect at least once every 14 calendar days and within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months of any precipitation, snow melt event, or both which exceeds 0.5 inches. In some cases, inspections in some cases will result in emergency repairs or heightened controls for a potential storm event.

The frequency of inspections may be reduced to once every 30 days after the permittee has completed earthwork and construction activities at the construction site and has installed BMPs as specified in the SWPPP.

All areas to be inspected monthly must have completed installation of temporary or permanent stabilization measures.

The inspections will be recorded in accordance with section 10.7 of the LCGP.

9.2.7 Signature and Certification Authorized signatories for this SWPPP are the following (see LCGP or SCGP Part 11.7.1):

For Corporations: A principal executive officer of at least the level of vice president or the manager of the site for which this SWPPP is being implemented who has day to day management control and decision making authority.

For partnerships: A general partner.

For a sole proprietorship: The proprietor For a municipal, state, federal or other public facility: Either a principal executive officer or ranking elected official.

I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. In addition, I certify that I am aware of the terms and conditions of the large construction general permit and I agree to comply with those requirements.

Tara Neider Senior Vice President and Project Director Printed Name of Person Signing Title 11/11/2024 410-507-0626 Signature Date Telephone c:\\arehner\\documents\\construction\\cgp_2020\\CGP swppp_template_2020_rev_fillable_word.doc TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

Digitally signed by: Basnet, Alex(ABASNET)

DN: CN = Basnet, Alex(ABASNET) C = US O = Bechtel Corporation Date: 2024.10.16 11:29:09 -04'00' Basnet, Alex(ABASNET)

Digitally signed by: Bhatia, Arunika(ABHATIA5)

DN: CN CN = Bhatia, Arunika(ABHATIA5) C = US US O = Bechtel Corporation Date: 2024.10.16 11:44:53 -04'00' Bhatia, Arunika(ABHATIA5)

Digitally signed by: Perkins, Kyra(KPERKINS)

DN: CN CN = Perkins, Kyra(KPERKINS) C = US US O = Bechtel Corporation Date: 2024.10.16 15:26:54 -04'00' Perkins, Kyra(KPERKINS)

Digitally signed by: Plasket, Katherine DN: CN = Plasket, Katherine C = US O =

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SIZE: E SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE-0009054 CLOSED WITH THE ISSUANCE OF ISSUED FOR CONSTRUCTION (IFC) DRAWINGS.

CONSTRUCTION FABRICATION OR PROCUREMENT. THIS OPEN ITEM CAN BE CONSIDERED LIMITED TO DIMENSIONS AND EQUIPMENT INFORMATION) AND IS NOT INTENDED FOR THIS DRAWING IS ISSUED FOR CPA WITH PRELIMINARY INFORMATION (INCLUDING BUT NOT EXISTING ROAD (189)

WB Interstate Semi-Trailer WB Interstate Semi-Trailer F150 SuperCab 4x4 STYLESIDE 8' Box SNOW REMOVAL AREA AREA REMOVAL SNOW MET TOWER POND SEDIMENT NI & EI FACILITY TRAINING PARKING AREA CONSTRUCTION TFF (NI)

ISLAND NUCLEAR (EI)

ISLAND ENERGY SWITCHYARD POND SEDIMENT ISLAND (EI)

ENERGY POND SEDIMENT ISLAND (NI)

NUCLEAR WB Interstate Semi-Trailer WB Interstate Semi-Trailer F150 SuperCab 4x4 STYLESIDE 8' Box SNOW REMOVAL AREA AREA REMOVAL SNOW RAILROAD SEE DRAWING 000-HH-0000-00002 FOR CONTINUATION MATCHLINE (N 766,350) 6735 6740 6735 N 766,500 WETLAND CREEK LITTLE MUDDY NORTH FORK RAIL BED ABANDONED FLOODPLAIN PIPE CULVERT EXISTING FLOODPLAIN STREAM EPHEMERAL PROPERTY LINE POND SEDIMENT NI & EI N 766,500 E 2,493,000 E 2,493,500 E 2,494,000 E 2,494,500 E 2,495,000 E 2,495,500 N 768,000 N 767,500 N 767,500 N 768,000 N 767,000 E 2,493,500 E 2,494,000 E 2,494,500 E 2,495,000 E 2,495,500 N 767,000 6755 6760 6750 6745 6750 6750 6755 6760 6765 6770 6765 6760 6755 6750 6755 6750 6745 6740 6735 6755 6750 6745 PARKING AREA CONSTRUCTION TFF 6760 6755 6755 (TYP)

APRON RIPRAP (TYP)

RISER (NI)

ISLAND NUCLEAR (EI)

ISLAND ENERGY SWITCHYARD POLE (TYP)

POWER EXISTING ACCESS ROAD EXISTING DIRT TRAIL EXISTING POND SEDIMENT ISLAND (EI)

ENERGY POND SEDIMENT ISLAND (NI)

NUCLEAR E 2,493,000 (SEE DWG 26396-TFF-HH-0000-00001)

TFF EROSION & SEDIMENT CONTROL (SEE DWG 26396-TFF-HH-0000-00001)

TFF EROSION & SEDIMENT CONTROL PLANT NORTH TRUE NORTH\\

SCALE: NTS KEY PLAN QL3 QL3 1" = 100' 26396-000-HH-0000-00001 1 of 2 1 of 2 A

00A N/A SEE BELOW 00A NST N/A EROSION AND SEDIMENT CONTROL PLAN SHEET 1 BECHTEL NAT-3715 PRELIMINARY. ISSUED FOR CONCEPTUAL DESIGN.

NOTES:

2. SILT FENCE (SF) IS 5FT INSIDE OF LIMIT OF DISTURBANCE.

SURVEY FEET. VERTICAL DATUM BASED ON NAVD88.

STATE PLANE COORDINATE SYSTEM, WY WEST (4904) NAD 83 IN US

1. COORDINATES SHOWN ON THIS DRAWING ARE BASED ON THE WYOMING REFERENCE DRAWINGS:

INITIAL SITE PLAN TEST AND FILL FACILITY (TFF) -

(26396-TFF-C2-0000-00005)

NAT-3685 TYPICAL DETAILS EROSION & SEDIMENT CONTROL CIVIL STANDARDS - SHEET 3 SOIL (26396-TFF-C0-0000-00003)

NAT-3673

REFERENCES:

EXISTING CONTOURS. SOURCE: LIDAR SURVEY PERFORMED DOC. NO.: NAT-7672 (26396-000-G27-GEK-00018)

BY INBERG-MILLER DATE: 03-11-2022 LEGEND:

5' EXISTING MAJOR CONTOUR 1' EXISTING MINOR CONTOUR PROPERTY LINE LIMIT OF DISTURBANCE TFF SILT FENCE ABANDONED RAIL BED REACTOR CENTER OF CREEK LITTLE MUDDY NORTH FORK ON THIS SHEET AREA OF WORK 0

SCALE: 1"=100' 200FT 150 100 CONTROL PLAN EROSION AND SEDIMENT SILT FENCE (SF)

EXISTING DRAINAGE FLOW RAILROAD CHECK DAM Copyright 2024 TERRAPOWER, LLC. ALL RIGHTS RESERVED TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

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SIZE: E SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE-0009054 CLOSED WITH THE ISSUANCE OF ISSUED FOR CONSTRUCTION (IFC) DRAWINGS.

CONSTRUCTION FABRICATION OR PROCUREMENT. THIS OPEN ITEM CAN BE CONSIDERED LIMITED TO DIMENSIONS AND EQUIPMENT INFORMATION) AND IS NOT INTENDED FOR THIS DRAWING IS ISSUED FOR CPA WITH PRELIMINARY INFORMATION (INCLUDING BUT NOT WB Interstate Semi-Trailer WB Interstate Semi-Trailer F150 SuperCab 4x4 STYLESIDE 8' Box SNOW REMOVAL AREA AREA REMOVAL SNOW MET TOWER FACILITY TRAINING PARKING AREA CONSTRUCTION TFF (NI)

ISLAND NUCLEAR (EI)

ISLAND ENERGY SWITCHYARD POND SEDIMENT ISLAND (EI)

ENERGY POND SEDIMENT ISLAND (NI)

NUCLEAR POND SEDIMENT NI & EI EXISTING HW Y US - 189 E 2,494,000 E 2,494,500 E 2,495,000 E 2,495,500 6735 6730 6735 6730 6730 6740 6745 6735 6740 6745 6750 6750 6745 6740 6735 E 2,493,000 E 2,492,500 N 765,500 N 765,000 N 764,500 6755 6760 6760 6760 6765 6770 6775 6750 6745 6740 6735 N 764,000 N 766,500 FLOODPLAIN STREAM EPHEMERAL FENCE EXISTING CREEK LITTLE MUDDY NORTH FORK RAIL BED ABANDONED 000-C0-0000-00003 PER DETAIL 12 ON DRAWING INSTALL SILT FENCE (TYP)

APRON RIPRAP CULVERTS (TYP)

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POWER EXISTING MET TOWER N 766,500 E 2,493,500 N 764,000 N 766,000 E 2,493,000 E 2,493,500 E 2,494,000 E 2,494,500 E 2,495,000 E 2,495,500 N 766,000 N 766,000 N 765,500 N 765,000 N 764,500 FACILITY TRAINING 6740 6735 6730 6730 POND SEDIMENT ISLAND (EI)

ENERGY WASH AREA ENTRANCE AND WHEEL STABILIZED CONSTRUCTION FLOODPLAIN SEE DRAWING 000-HH-0000-00001 FOR CONTINUATION MATCHLINE (N 766,350)

(SEE DWG 26396-TFF-HH-0000-00001)

TFF EROSION & SEDIMENT CONTROL POND SEDIMENT NI & EI PLANT NORTH TRUE NORTH\\

SCALE: NTS KEY PLAN RAILROAD QL3 QL3 1" = 100' 26396-000-HH-0000-00002 2 of 2 2 of 2 A

00A N/A SEE BELOW 00A NST N/A EROSION AND SEDIMENT CONTROL PLAN SHEET 2 BECHTEL NAT-3715 PRELIMINARY. ISSUED FOR CONCEPTUAL DESIGN.

0 SCALE: 1"=100' 200FT 150 100 CONTROL PLAN EROSION AND SEDIMENT ON THIS SHEET AREA OF WORK NOTES:

2. SILT FENCE (SF) IS 5FT INSIDE OF LIMIT OF DISTURBANCE.

SURVEY FEET. VERTICAL DATUM BASED ON NAVD88.

STATE PLANE COORDINATE SYSTEM, WY WEST (4904) NAD 83 IN US

1. COORDINATES SHOWN ON THIS DRAWING ARE BASED ON THE WYOMING REFERENCE DRAWINGS:

INITIAL SITE PLAN TEST AND FILL FACILITY (TFF) -

(26396-TFF-C2-0000-00005)

NAT-3685 TYPICAL DETAILS EROSION & SEDIMENT CONTROL CIVIL STANDARDS - SHEET 3 SOIL (26396-TFF-C0-0000-00003)

NAT-3673

REFERENCES:

EXISTING CONTOURS. SOURCE: LIDAR SURVEY PERFORMED DOC. NO.: NAT-7672 (26396-000-G27-GEK-00018)

BY INBERG-MILLER DATE: 03-11-2022 LEGEND:

5' EXISTING MAJOR CONTOUR 1' EXISTING MINOR CONTOUR PROPERTY LINE LIMIT OF DISTURBANCE TFF SILT FENCE ABANDONED RAIL BED SILT FENCE (SF)

EXISTING DRAINAGE FLOW CREEK LITTLE MUDDY NORTH FORK REACTOR CENTER OF Copyright 2024 TERRAPOWER, LLC. ALL RIGHTS RESERVED TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

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CONSTRUCTION FABRICATION OR PROCUREMENT. THIS OPEN ITEM CAN BE CONSIDERED LIMITED TO DIMENSIONS AND EQUIPMENT INFORMATION) AND IS NOT INTENDED FOR THIS DRAWING IS ISSUED FOR CPA WITH PRELIMINARY INFORMATION (INCLUDING BUT NOT EXISTING ROAD (189)

WB Interstate Semi-Trailer WB Interstate Semi-Trailer F150 SuperCab 4x4 STYLESIDE 8' Box E 2,493,000 E 2,493,500 E 2,494,000 E 2,495,500 E 2,496,000 N 766,000 N 766,500 N 767,000 N 767,500 N 768,000 N 768,500 N 769,000 FLOODPLAIN FLOODPLAIN RIGHT OF W AY RAILROAD 200' W IDE 50' BUFFER N 765,500 E 2,496,500 ACCESS ROAD EXISTING DIRT BRIDGE PROPERTY LINE E 2,494,500 E 2,495,000 PIPE CULVERT EXISTING CREEK LITTLE MUDDY NORTH FORK STREAM EPHEMERAL WETLAND N 765,000 N 764,500 N 764,000 N 766,000 N 766,500 N 767,000 N 767,500 N 768,000 N 768,500 N 769,000 N 765,500 N 765,000 N 764,500 N 764,000 E 2,493,000 E 2,493,500 E 2,494,000 E 2,495,500 E 2,496,000 E 2,496,500 E 2,494,500 E 2,495,000 FENCE EXISTING GUARD EXISTING CATTLE TRAILER CONTROL AND OFFICE TANK STORAGE SODIUM EXTERNAL RAIL BED ABANDONED RAILROAD 24" CMP MET TOWER ISLAND ENERGY ISLAND NUCLEAR TFF SCALE: NTS KEY MAP REFERENCE DRAWINGS:

NOTES:

5' EXISTING MAJOR CONTOUR 1' EXISTING MINOR CONTOUR FLOODPLAIN LEGEND:

FENCE PROPERTY LINE LIMITS OF CLEARING AND GRUBBING ABANDONED RAIL BED

REFERENCES:

MAP NUMBER: 56023C2230D AND 56023C2235D (NOV 2011)

FLOODPLAIN. SOURCE: FEMA EXISTING CONTOURS. SOURCE: LIDAR SURVEY PERFORMED STREAM (FIELD DELINEATED)

WETLAND (FIELD DELINEATED)

(26396-TFF-P1-9100-00001) TFF PLOT PLAN NAT-5073 DOC. NO.: NAT-7303 (26396-000-V14-HKYI-00004)

U.S. DELINEATION REPORT WETLANDS SOURCE: TETRA TECH, WETLANDS AND OTHER WATERS OF THE DOC. NO.: NAT-7672 (26396-000-G27-GEK-00018)

BY INBERG-MILLER DATE: 03-11-2022 PLANT NORTH TRUE NORTH\\

QL3 QL3 1" = 160' 26396-000-C2-0000-00004 1 of 1 1 of 1 A

00A N/A 00A NST N/A CLEARING AND GRUBBING PLAN BECHTEL NAT-8624 ISSUED FOR CPA GRUBBING PLAN CLEARING AND 0

320 480 FT SCALE: 1"=160' 160 PRELIMINARY OF TFF EARTHWORK CLEARING AND GRUBBING PERFORMED AS PART

2. CLEARING AND GRUBBING AREA : 131.62 ACRES.

SURVEY FEET. VERTICAL DATUM BASED ON NAVD88.

STATE PLANE COORDINATE SYSTEM, WY WEST (4904) NAD 83 IN US

1. COORDINATES SHOWN ON THIS DRAWING ARE BASED ON THE WYOMING SEE BELOW Copyright 2024 TERRAPOWER, LLC. ALL RIGHTS RESERVED TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

NUMBER EROSION CONTROL BLANKET PLACE STAPLES/STAKES PER MANUFACTURER'S RECOMMENDATION FOR THE APPROPRIATE SLOPE BEING APPLIED.

6.

BLANKET WIDTH.

APPROXIMATE 3" OVERLAP. STAPLE THROUGH OVERLAPPED AREA, APPROXIMATELY 12" APART ACROSS ENTIRE

5. CONSECUTIVE BLANKETS SPLICED DOWN THE SLOPE MUST BE PLACED END OVER END (SHINGLE STYLE) WITH AN SEAM STITCH ON THE PREVIOUSLY INSTALLED BLANKET.

ALIGNMENT, PLACE THE EDGE OF THE OVERLAPPING BLANKET (BLANKET BEING INSTALLED ON TOP) EVEN WITH THE

4. THE EDGES OF PARALLEL BLANKETS MUST BE STAPLED WITH MINIMUM 6" OVERLAP. TO ENSURE PROPER SEAM PLACING STAPLES/STAKES IN APPROPRIATE LOCATIONS AS PER MANUFACTURES RECOMMENDATION.

APPROPRIATE SIDE AGAINST THE SOIL SURFACE. ALL BLANKETS MUST BE SECURELY FASTENED TO SOIL SURFACE BY ROLL THE BLANKETS (A.) DOWN OR (B.) HORIZONTALLY ACROSS THE SLOPE. BLANKETS WILL UNROLL WITH

3.

STAPLES/STAKES SPACED APPROXIMATELY 12" APART ACROSS THE WIDTH OF THE BLANKET.

BLANKET BACK OVER SEED AND COMPACTED SOIL. SECURE BLANKET OVER COMPACTED SOIL WITH A ROW OF COMPACT THE TRENCH AFTER STAPLING. APPLY SEED TO COMPACTED SOIL AND FOLD REMAINING 12"PORTION OF BLANKET WITH A ROW OF STAPLES/STAKES APPROXIMATELY 12" APART IN THE BOTTOM OF THE TRENCH. BACKFILL AND 12" OF BLANKET EXTENDED BEYOND THE UP-SLOPE PORTION OF THE TRENCH AS SHOWN IN DETAIL 2. ANCHOR THE BEGIN AT THE TOP OF THE SLOPE BY ANCHORING THE BLANKET IN A 6" DEEP X 6" WIDE TRENCH WITH APPROXIMATELY

2.

SEED.

PREPARE SOIL BEFORE INSTALLING BLANKETS, INCLUDING ANY NECESSARY APPLICATION OF LIME, FERTILIZER, AND

1.

MANUFACTURER BLANKETS INSTALLED FERTILIZED, SEEDED, AND EROSION ALL SLOPES 3:1 OR GREATER SHALL BE NOTE:

OR APPROVED EQUAL NORTH AMERICAN GREEN SC250 CONSTRUCTED RIDGE SWALE WITH CHECK DAM ROCK CHECK DAM NOT TO SCALE FINISH GRADE GRADE FINISH GRADE ROUGH FINISH GRADE FINISH GRADE CONCRETE LINED DITCH FINISH GRADE FINISH GRADE FINISH GRADE ON DESIGN DRAWING SLOPE AS SHOWN FINISH GRADE SEEDED DITCH GRAVEL LINED DITCH RIPRAP DITCH CONCRETE DITCH SWALE GRADE FINISH GRADE ROUGH DRAINAGE DITCH DETAILS X

X X

X VARIES

'D' T

H 2.

5.

4.

3A.

3B.

1.

EXISTING GRADE EXISTING GRADE EVERY 100' ROCK CHECK DAM SPACED 3"

D 1'-0" RIP RAP RIPRAP LAYER ROCKS, 18" THICK D50, 8" ANGULAR VARIES FILTER FABRIC NON-WOVEN GEOTEXTILE 4" CONCRETE 4X4-W4XW4 WWF 2' MINIMUM H

V H

V V

H V

H H

V H

V V

H 1'-0" V

H H = FREEBOARD & SETTLEMENT D = DEPTH T = TOP WIDTH NOT TO SCALE DIVERSION SWALE BEFORE THE GRASS LINING BECOMES ESTABLISHED SHALL BE REPAIRED WITHOUT DELAY.

7. GULLIES THAT MAY FORM IN THE CHANNEL OR OTHER EROSION DAMAGE THAT OCCURS CONSTRUCTED CHANNEL THROUGH THE ESTABLISHMENT PERIOD.

VEGETATION, SURFACE WATER MAY BE PREVENTED FROM ENTERING THE NEWLY STABILIZED PRIOR TO BECOMING OPERATIONAL. TO AID IN THE ESTABLISHMENT OF

6. CONSTRUCTION SHALL BE SEQUENCED SO THAT THE NEWLY CONSTRUCTED CHANNEL IS APPLICABLE VEGETATIVE SPECIFICATIONS.

FERTILIZING, SEEDING, AND MULCHING SHALL CONFORM TO THE RECOMMENDATIONS IN THE

5.

TO THE CHANNEL OR INTERFERE WITH ITS FUNCTIONING.

4. EXCESS EARTH SHALL BE GRADED OR DISPOSED OF SO THAT IT WILL NOT RESTRICT FLOW CONSTRUCTION EQUIPMENT TO PREVENT UNEQUAL SETTLEMENT.

UNIFORM LAYERS NOT EXCEEDING 9 INCHES USING THE WHEEL TREADS OR TRACKS OF THE FILL MATERIAL USED IN THE CONSTRUCTION OF THE CHANNEL SHALL BE WELL COMPACTED IN

3.

SECTION.

THE DIVERSION SHALL BE EXCAVATED AND SHAPED TO THE PROPER GRADE AND CROSS

2.

THE WORK SITE.

ALL TREES, BRUSH, STUMPS, AND OTHER UNSUITABLE MATERIAL SHALL BE REMOVED FROM

1.

6" 6"

12" 2' MINIMUM GRAVEL VARIES ON DESIGN DWGS AS SHOWN SEEDED AS SHOWN ON DESIGN DWGS VARIES DETAIL 5

DETAIL 6

DETAIL 4

DETAIL 7

DETAIL 8

DETAIL 3

DETAIL 2

DETAIL 1

DETAIL 9

NOT TO SCALE NOT TO SCALE NOT TO SCALE NOT TO SCALE NOT TO SCALE NOT TO SCALE NOT TO SCALE NOT TO SCALE FROM THE CHANNEL SIDES.

LOWER THAN THE SIDES IN ORDER TO DIRECT ACROSS THE CENTER AND AWAY THE MIDPOINT OF THE ROCK CHECK DAM SHALL BE A MINIMUM OF 6 INCHES

3.

MAXIMUM HEIGHT OF CHECK DAM SHALL NOT EXCEED 3.0 FEET.

2.

WITH A GRAVEL FILTER ACCORDING TO SECTION 511 SSBRC.

(WYDOT) CLASS II STONE IS ACCEPTABLE, BUT SHOULD BE UNDERLAIN STANDARD SPECIFICATION FOR ROAD AND BRIDGE CONSTRUCTION (SSBRC)

PLACED SO THAT IT COMPLETELY COVERS THE WIDTH OF THE CHANNEL.

THE CHECK DAM SHALL BE CONSTRUCTED OF 4-8 INCH DIAMETER STONE, 1.

AS SHOWN ON DESIGN DWGS.

ON DESIGN DWGS.

AS SHOWN 6" MIN.

4' MIN.

COMPACTED BACKFILLED AND TRENCH TO BE SECTION SWPPP INFORMATION SIGN SWPPP INFORMATION SITE MAPS) ON THE SITE.

DOCUMENTATION (BINDER AND LOCATION OF THE SWPPP DETAILED DESCRIPTION OF THE AUTHORIZATION GENERAL PERMIT CONTRACTOR GENERAL COPY OF NOI OF COPY

- WRAP GEOTEXTILE AROUND STAKES BEFORE DRIVING FENCE SECTION OF SILT JOINING ELEVATION SILT FENCE (SF)

NOT TO SCALE NOT TO SCALE SHALL BE REPAIRED IMMEDIATELY.

EFFECTIVENESS. IF DAMAGED, THE SILT FENCE TO ENSURE ITS PROPER LOCATION AND EXISTING SILT FENCE SHALL BE REVIEWED DAILY PROLONGED RAINFALL. THE LOCATION OF RAINFALL AND AT LEAST DAILY DURING A SILT FENCES SHALL BE INSPECTED AFTER EACH SILT FENCE.

APPROXIMATELY ONE-HALF OF THE HEIGHT OF THE REMOVED WHEN THE DEPOSIT REACHES SEDIMENT DEPOSITS SHALL BE ROUTINELY SHALL BE INSTALLED.

SHALL BE REMOVED, OR 3) OTHER PRACTICES SHALL BE CHANGED, 2) ACCUMULATED SEDIMENT APPROPRIATE: 1) THE LAYOUT OF THE SILT FENCE FOLLOWING SHALL BE PERFORMED, AS A CONCENTRATED FLOW DISCHARGE, ONE OF THE THE FENCE ENDS, OR IN ANY OTHER WAY ALLOWS FENCE, FLOWS UNDER THE FABRIC OR AROUND GEOTEXTILE. IF RUNOFF OVERTOPS THE SILT TO PASS ONLY AS DIFFUSE FLOW THROUGH THE MAINTENANCE--SILT FENCE SHALL ALLOW RUNOFF

10.

FABRIC PROPERTIES VALUES TEST METHOD MINIMUM TENSILE STRENGTH 120 LBS. (535 N)

ASTM D 4632 MAXIMUM ELONGATION AT 60 LBS MINIMUM PUNCTURE STRENGTH MINIMUM TEAR STRENGTH APPARENT OPENING SIZE MINIMUM PERMITTIVITY UV EXPOSURE STRENGTH RETENTION 50%

50 LBS (220 N) 40 LBS (220 N)

< 0.84 MM 1X10-2 SEC.-1 70%

ASTM D 4632 ASTM D 4833 ASTM D 4533 ASTM D 4751 ASTM D 4491 ASTM G 4355 SUPER SILT FENCE (SSF)

UPSTREAM GEOTEXTILE OVER &

W/ 1 LAYER OF CHAIN LINK FENCE FLOW NOT TO SCALE GROUND UNDISTURBED BACKFILL COMPACTED FENCE POST OR HARDWOOD TYPE FENCE POST STEEL "T" OR "U" FLOW SILT FENCE DETAILS NOT TO SCALE SILT FENCE THAN TALLER MESH SPACING) 6 INCHES MAX (14 GAUGE MIN, WOVEN WIRE FENCE FENCE FABRIC TABLE 1 MINIMUM CRITERIA FOR SILT NO SLOPE LEVEL CONTOUR FLOW FRONT OF BARRIER FLAT SLOPE IN 6" MIN.

FLOW FLOW 94.5" MAX CENTER TO CENTER BUT NOT LESS THAN MANUFACTURER'S RECOMMENDATION SPACE PER SILT FENCE MOISTURE, ETC.).

WEATHER (WIND, SUN, FROM DAMAGE DUE TO TO PROTECT DOCUMENTS CONSTRUCTED IN A MANNER BOARD. SIGN MUST BE PLYWOOD OR OUTDOOR SIGN A RIGID MATERIAL, SUCH AS SIGN TO BE CONSTRUCTED OF B

FLOW A

STABILITY OF THIS SWPPP INFORMATION SIGN.

CONTRACTOR IS RESPONSIBLE FOR ENSURING

5)

GOVERNING AGENCY.

OF-WAY AND EASEMENTS UNLESS APPROVED BY THE SIGN SHALL BE LOCATED OUTSIDE OF PUBLIC RIGHT-

4)

AGENCY.

PERMITS ON THE SIGN AS REQUIRED BY THE LOCAL AND/OR EROSION AND SEDIMENT CONTROL RELATED CONTRACTOR SHALL POST OTHER STORM WATER

3)

PERMIT.

NOTICE-OF-TERMINATION (NOT) IS FILED FOR THE THROUGHOUT CONSTRUCTION AND UNTIL THE CLEARLY READABLE CONDITION AT ALL TIMES ALL POSTED DOCUMENTS MUST BE MAINTAINED IN A

2)

CAUSE A SAFETY HAZARD.

PUBLIC, BUT NOT OBSTRUCTING VIEWS AS TO IT IS ACCESSIBLE/VIEWABLE BY THE GENERAL NEAR THE ENTRANCE/EXIT OF THE SITE, SUCH THAT THE SWPPP INFORMATION SIGN MUST BE LOCATED

1)

SEE DETAIL B GEOTEXTILE CHAIN LINK FENCE SILT FENCE FABRIC SURFACE GROUND TRENCH TOE ANCHOR 10'-0" MAX MIN.

3' 3'

MIN.

12" (MIN) 6" FABRIC COVER WITH SILT FENCE WOVEN WIRE FENCE GROUND 6 INCHES INTO THE FABRIC A MIN OF EMBED SILT FENCE 4' (MINIMUM) 4' (MINIMUM)

MIN

=16" MIN 6"

FABRIC SILT FENCE HEIGHT OF 16" MIN 3'-0" MIN OF GEOTEXTILE SECOND LAYER 33" MIN POST &

DETAIL 12 DETAIL 11 SECTION A

DETAIL 13 DETAIL 10 ALUMINUM POSTS GALVANIZED OR

" DIAMETER 2

1 2

SURFACE GROUND FLOW 33" MIN.

3'-0" MIN.

SECTION B

NOT TO SCALE DESIGN DRAWINGS)

(OPTIONAL, SEE HAY BALES SWPPP INFORMATION NOTES:

GROUND INCHES INTO A MIN OF 16 POSTS DRIVEN FENCE HEIGHT.

18 INCHES MAX INTO THE GROUND, (SEE DETAIL 11).

WITH A MINIMUM 6-IN. OVERLAP PRIOR TO DRIVING BE SPLICED TOGETHER ONLY AT A SUPPORT POST SEAMS BETWEEN SECTIONS OF SILT FENCE SHALL

9.

TRENCH SHALL BE BACKFILLED AND COMPACTED.

BOTTOM OF THE 6-INCH DEEP TRENCH. THE SURFACE. EXCESS MATERIAL SHALL LAY ON THE GEOTEXTILE MUST BE BELOW THE GROUND GEOTEXTILE. A MINIMUM OF 8 INCHES OF STAKES ON THE DOWNSLOPE SIDE OF THE THE SILT FENCE SHALL BE PLACED WITH THE

8.

TRENCH DEPTH.

THAT WILL ENSURE AN ADEQUATELY UNIFORM SLICING MACHINE, OR OTHER SUITABLE DEVICE WITH A TRENCHER, CABLE LAYING MACHINE, 6 INCHES DEEP. THE TRENCH SHALL BE MADE EXCAVATED OR SLICED TRENCH CUT A MINIMUM OF THE SILT FENCE SHALL BE PLACED IN AN

7.

GROUND SURFACE.

MINIMUM OF 16 INCHES ABOVE THE ORIGINAL THE HEIGHT OF THE SILT FENCE SHALL BE A

6.

INSTALLATION OF THE SILT FENCE.

REESTABLISHED WITHIN 7 DAYS FROM THE VEGETATION IS REMOVED, IT SHALL BE POSSIBLE) UPSLOPE FROM THE SILT FENCE. IF PRESERVED FOR 5 FEET (OR AS MUCH AS WHERE POSSIBLE, VEGETATION SHALL BE

5.

AREA AVAILABLE.

SILT FENCE SHALL BE PLACED ON THE FLATTEST

4.

FLOWING AROUND THE ENDS.

THE SILT FENCE WILL BE PREVENTED FROM UPSLOPE SLIGHTLY SO THAT WATER PONDED BY ENDS OF THE SILT FENCES SHALL BE BROUGHT

3.

LENGTH.

TO THE SILT FENCE ARE DISSIPATED ALONG ITS THAT MAY CARRY SMALL CONCENTRATED FLOWS AND SO THAT SMALL SWALES OR DEPRESSIONS NOT CONCENTRATE AT LOW POINTS IN THE FENCE THE CONTOUR AS POSSIBLE SO THAT WATER WILL ALL SILT FENCE SHALL BE PLACED AS CLOSE TO

2.

UPSLOPE LAND DISTURBANCE BEGINS.

SILT FENCE SHALL BE CONSTRUCTED BEFORE

1.

SILT FENCE NOTES:

SILT FENCE FABRIC - SEE TABLE 1

2.

SEDIMENT/WATER LOADING.

PREVENT OVERTURNING OF THE FENCE DUE TO THE POSTS SHALL BE ADEQUATELY SECURED TO THE GROUND, WHERE POSSIBLE. IF NOT POSSIBLE, THAN 94.5" AND DRIVEN A MINIMUM 12 INCHES INTO MANUFACTURE'S RECOMENDATION BUT NOT MORE WEAKEN THE POSTS. POST SPACING SHALL BE PER AND OTHER VISIBLE IMPERFECTIONS, THAT WILL QUALITY. THEY SHALL BE FREE OF KNOTS, SPLITS NOMINAL DIMENSIONED HARDWOOD OF SOUND OF 32 INCHES. WOOD POSTS WILL BE 2-BY-2-IN.

FENCE POST - THE LENGTH SHALL BE A MINIMUM 1.

CRITERIA FOR SILT FENCE MATERIALS 6"

GEOTEXTILE LAYER OF FIRST 8" MIN IN THE GROUND

& GEOTEXTILE 8" MINIMUM EMBED CHAIN LINK FENCE CHAIN LINK FENCE GEOTEXTILE A AND B ARE OF EQUAL ELEVATION L = THE DISTANCE SUCH THAT POINTS POINT B

'L' POINT A SEE NOTE 5 FLOW AROUND CHECK DAM OVER NOT MUST CAUSE FLOW LOW CENTER SECTION 1

3 1

3 GRADE GRADE C

C 1

2 1

2 AT CENTER 2' MAXIMUM CROSS SECTION SIDE VIEW SECTION C - C SHOWN IN THE DETAIL.

ACROSS THE TOP OF THE SIGN, AS DISPLAYED PROMINENTLY "SWPPP INFORMATION" MUST BE SIDE SLOPES SHALL BE A MINIMUM OF 2H:1V.

6.

DAM.

UPSTREAM DAM IS AT THE SAME ELEVATION AS THE TOP OF THE DOWNSTREAM SPACING OF CHECK DAMS SHALL BE IN A MANNER SUCH THAT THE TOE OF THE

5.

INCHES.

THE BASE OF THE CHECK DAM SHALL BE ENTRENCHED APPROXIMATELY 6

4.

PERSPECTIVE VIEW SILT FENCE NOTES:

FENCING MAY BE SUBSTITUTED.

PREFABRICATED SILT FENCING WITH INTEGRAL WOVEN WIRE

6.

REMOVED PER MANUFACTURER'S RECOMMENDATION.

MAINTENANCE SHALL BE PERFORMED AS NEEDED AND MATERIAL

5.

BE OVERLAPPED BY 6 INCHES AND FOLDED.

WHEN TWO SECTIONS OF FILTER FABRIC ARE JOINED, THEY SHALL

4.

FENCE WITH TIES SPACED AT 24 INCHES AT THE TOP AND BOTTOM.

SILT FENCE FABRIC SHALL BE FASTENED SECURELY TO WOVEN WIRE

3.

SILT FENCE SHALL BE TERRASTOP PREMIUM, OR EQUIVALENT.

2.

WITH WIRE TIES OR STAPLES.

WOVEN FENCE SHALL BE FASTENED SECURELY TO FENCE POSTS

1.

DRAINAGE DITCH L

C DRAINAGE DITCH L

C CL DITCH DRAINAGE SWALE CL SWALE CL FINISH GRADE E Template - Rev 3 A

A B

B C

C D

D E

E F

F G

G H

H 8

8 7

7 6

6 5

5 4

4 3

3 2

2 1

1 SCALE:

DWG NO.

REV:

ALT NO.

ALT REV:

DWG TITLE SHEET:

ORIG. ORG.:

REV REASON FOR REVISION DATE ELECTRONIC APPROVAL RECORDED IN EDMS QUALITY LEVEL:

SAFETY CLASS:

TARGET QL:

DOCUMENT STATUS:

APPROVAL ROLES AND SIGNATURES BY CHK DV EGS PE/PEM CHK:

EGS:

SHEET:

BY:

DV:

PE/PEM:

SIZE: E TerraPower Proprietary and Confidential - Subject to Confidentiality Agreement SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 CONSTRUCTION NOT FOR PRELIMINARY QL3 QL3 NTS 26396-000-C0-0000-00003 1 of 1 1 of 1 A

00A N/A SEE BELOW 00A NST APPROVED FOR USE N/A CIVIL STANDARDS - SHEET 3 SOIL EROSION & SEDIMENT CONTROL TYPICAL DETAILS BECHTEL NAT-5753 ISSUED FOR BID TP-LIC-LET-0362 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved PRELIMINARY Copyright 2024 TERRAPOWER, LLC. ALL RIGHTS RESERVED.

ENCLOSURE 3 USO Response to RAI-2 (Non-Proprietary)

RAI - 2 REQUIREMENT: 10 CFR 51.45(c) requires that the ER include a description of the affected environment including offsite activities that could result in cumulative impacts; hydrologic alterations; impacts to wetlands and historical properties; disturbances to terrestrial habitat; and changes to land use designations. Per NRC Regulatory Guidance 4.2, a description of the offsite affected environment should include, but not limited to, a description of offsite project elements (i.e., transmission lines), map showing the potential or planned routing (i.e., the specific route or a band encompassing the route) of new corridors, and location of related utilities, etc.

ISSUE: The NRC staff is preparing an environmental impact statement (EIS) in accordance with Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Domestic Licensing of Production and Utilization Facilities. TerraPower submitted an Environmental Report (ER) as part of its CP application in accordance with 10 CFR Part 51, Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions. The Nuclear Regulatory Commissions (NRC) regulations at 10 CFR Part 51, which implement Section 102(2) of the National Environmental Policy Act (NEPA) of 1969, include requirements for applicants to provide information as may be useful in aiding the NRC staff in complying with NEPA.

REQUEST: Please provide a description of the water pipeline and the transmission line connecting Naughton Power Plant and Kemmerer Unit 1 site along the offsite corridor. Include in the description processes for selecting the final route and service and/or access roads within the study area and/or ROWs, strategies for avoiding impacts to known resources (e.g., wetlands, streams, and historic properties), estimated size and density of utility structures (e.g.,

transmission towers and associated pads), and construction methods. Provide a map (including GIS shapefiles) of the proposed route(s) of the water pipeline and transmission lines from the Naughton Power Plant to Kemmerer Unit 1 (including any stream/wetland crossings and where the pipeline will run to at Kemmerer Unit 1 site).

USO Response to RAI-2 REQUEST: Please provide a description of the water pipeline and the transmission line connecting Naughton Power Plant and Kemmerer Unit 1 site along the offsite corridor.

The proposed routes of the new utility corridor are not currently known and easements for the transmission and water pipeline right-of-way (ROWs) are still being negotiated. This condition was foreseen by the guidance in Regulatory Guide 4.2 Revision 3 Section 2.1.2, Transmission-Line Corridors and Other Offsite Areas, which states the following:

.Information on the routing and design of transmission lines and other offsite facilities may be limited at the time that a licensing application is submitted, especially if a party of other than the applicant will own or be responsible for all or some of the offsite facilities.The ER may explain when more detailed information may be available or that more detailed information may not be available until some unspecified time in the future. The ER should include the best available information on the possible transmission lines to support an analysis of the possible TP-LIC-LET-0362 Page 1 of 3 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

contribution of building and operating the transmission lines on the cumulative environmental impacts of the action.

The precise routes of the new water pipeline and transmission corridor have not been determined; however, consistent with guidance in RG 4.2, ER Sections 2.1.2, 4.1.2, 5.1.2, and Figures 2.1-1, 2.1-7, and 2.1-10 provide the preliminary description of the macro-corridor for the water pipeline and transmission lines. As the utility corridor design progresses, the project will work to the requirements of Rocky Mountain Power and PacificCorps transmission construction standards.

Include in the description processes for selecting the final route and service and/or access roads within the study area and/or ROWs, ER Section 4.1.2 describes the ROWs in terms of the anticipated construction techniques and land requirement.

The definitive routes of the new transmission lines will be determined by a formal transmission siting study and will be in compliance with Wyoming state and local permits. Access roads will meet Rocky Mountain Power and PacifiCorps construction road standards.

Strategies for avoiding impacts to known resources (e.g., wetlands, streams, and historic properties),

The Kemmerer Unit 1 ER characterizes the resources that would be affected based on the attributes of the macro-corridors. ER Figure 2.1-10, shows the land cover found along the macro-corridors. The proposed routes of the new ROWs are not currently known and easements for the transmission and water pipeline ROWs are still being negotiated. USO determined the probable route characteristics using a macro-corridor approach (i.e., "a band encompassing the route" as provided for in RG 4.2 Section 2.1.2.).

Throughout the environmental report, the macro-corridors are used to characterize the potential impacts associated with the construction and operation of the water supply pipeline and transmission lines. Detailed routing of the transmission lines and water pipeline will avoid or minimize impact on resources identified within the macro-corridors to the extent practicable.

Macro-corridors were defined to avoid resources identified in the study area. Cultural resources were avoided, however, the 48LN8940 site crossed most of the study area. ER Section 4.3.1.2.2 discusses the streams and wetlands crossed by the macro-corridors. Several streams also crossed the entire study area and could not be avoided. The construction and routing of the water pipeline and transmission corridor is expected to avoid the wetlands, streams, roads, and railroads along the macro-corridors where practicable and use construction techniques such as horizontal directional drilling to minimize impacts to resources that cannot be avoided. During construction, wetlands and waterways could be indirectly impacted by runoff and sedimentation, but these impacts would be temporary and mitigated to the extent practicable by environmental best management practices. Transmission lines will be installed as overhead powerlines, spanning wetlands and streams. Because the terrain is relatively level along the macro-corridors TP-LIC-LET-0362 Page 2 of 3 SUBJECT TO DOE COOPERATIVE AGREEMENT NO. DE-NE0009054 Copyright © 2024 TerraPower, LLC. All Rights Reserved

TP-LIC-LET-0362 Page 3 of 3 and most vegetation is low growing (no trees are present in site vicinity outside of the Hams Fork floodplain), it may not be necessary to clear the ROW, or major portions of the ROW.

ER Section 4.6.2.1 describes the cultural resources within the macro-corridors (offsite areas).

The macro-corridors contain a single historic property that could be adversely affected by the Project, site 48LN8940. The site lies across most of the macro-corridor, and while the design of the water line and transmission lines has not yet been developed, it will be difficult for the alignments of the two utility lines not to cross the site. For the water line, it may be possible to avoid impacts to the site through further testing to define the contributing portions of the historic property and route the water line via those portions of the delineated site. An additional avoidance strategy could be to extend the APE and ROW East in the area around 48LN8940.

For the transmission lines, it may be possible to avoid impacts to the site by erecting transmission structures on either side of the site and spanning it aerially. The proposed spans (less than 600 feet) are within those typical of 230 kV transmission lines.

As described in the Class III cultural resources report, if impacts to 48LN8940 cannot be avoided site mitigation will occur.

Estimated size and density of utility structures (e.g., transmission towers and associated pads), and construction methods.

Kemmerer Unit 1 ER Section 2.1.2 and Figures 2.1-1, 2.1-7, and 2.1-10 provide preliminary estimates for the lengths of water pipeline and transmission lines.

Based on similar projects in the western United States, less than 0.25 acres (0.10 hectares) would be required for each tower foundation or base. A slightly larger area would be disturbed during clearing and grading of the tower locations. Adjacent areas disturbed during tower construction would be stabilized and re-vegetated. Transmission towers will be sited to avoid environmentally sensitive areas such as streams and wetlands.

The project will work to the requirements in PacifiCorps Transmission Construction Standards Manual for the construction of overhead transmission line.

Provide a map (including GIS shapefiles) of the proposed route(s) of the water pipeline and transmission lines from the Naughton Power Plant to Kemmerer Unit 1 (including any stream/wetland crossings and where the pipeline will run to at Kemmerer Unit 1 site).

The maps and GIS shapefiles provided contain cultural sensitive information and are withheld as Sensitive Unclassified Nonsafeguards Information Submitted Under 10 CFR 2.390(a)(3).

ENCLOSURE 4 TerraPower, LLC Affidavit and Request for Withholding from Public Disclosure (10 CFR 2.390(a)(4))

TerraPower, LLC Affidavit and Request for Withholding from Public Disclosure (10 CFR 2.390(a)(4))

I, George Wilson, hereby state:

1. I am the Vice President, Regulatory Affairs and I have been authorized by TerraPower, LLC (TerraPower) to review information sought to be withheld from public disclosure in connection with the development, testing, licensing, and deployment of the NatriumTM reactor and its associated fuel, structures, systems, and components, and to apply for its withholding from public disclosure on behalf of TerraPower.

2. The information sought to be withheld, in its entirety, is contained in Enclosure 5, which accompanies this Affidavit.

3. I am making this request for withholding, and executing this Affidavit as required by 10 CFR 2.390(b)(1).

4. I have personal knowledge of the criteria and procedures utilized by TerraPower in designating information as a trade secret, privileged, or as confidential commercial or financial information that would be protected from public disclosure under 10 CFR 2.390(a)(4).

5. The information contained in Enclosure 5 accompanying this Affidavit contains non-public details of the TerraPower regulatory and developmental strategies intended to support NRC staff review.

6. Pursuant to 10 CFR 2.390(b)(4), the following is furnished for consideration by the Commission in determining whether the information in Enclosure 5 should be withheld:

a. The information has been held in confidence by TerraPower.

b. The information is of a type customarily held in confidence by TerraPower and not customarily disclosed to the public. TerraPower has a rational basis for determining the types of information that it customarily holds in confidence and, in that connection, utilizes a system to determine when and whether to hold certain types of information in confidence.

The application and substance of that system constitute TerraPower policy and provide the rational basis required.

c. The information is being transmitted to the Commission in confidence and, under the provisions of 10 CFR 2.390, it is received in confidence by the Commission.

d. This information is not available in public sources.

e. TerraPower asserts that public disclosure of this non-public information is likely to cause substantial harm to the competitive position of TerraPower, because it would enhance the ability of competitors to provide similar products and services by reducing their expenditure of resources using similar project methods, equipment, testing approach, contractors, or licensing approaches.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on: December 6, 2024 George Wilson Vice President, Regulatory Affairs TerraPower, LL

ML25024A136

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Subject:

Subject:

Dear Ms. Rehner:

Enclosures:

Title:

Title:

Description:

Title:

Description:

REFERENCES:

REFERENCES:

REFERENCES:

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