(x)

1240LT26Q0168

x x

1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE

RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR

OFFER. If by virtue of this amendment you desire to change an offer already submitted , such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

40LT

OGDEN UT 84401-2310

324 25TH ST

USDA-FS CSA INTERMOUNTAIN 8

08/26/20260001

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended , by one of the following methods: (a) By completing

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

08/12/2026

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

Project Title: Forest Wide Well Decommissioning Mystic River and Custer Ranger Districts, Black Hills National Forest, South Dakota

The purpose of this amendment is the following:

1. Consolidated questions and answers. Site visit sign-in sheet is incorporated into the amendment and has been redacted for privacy.

2. Revisions - Revision 1 to Attachment 1 Statement of Work (Att.1 - C5 - Statement of Work

USDA RV1 8.21.2026) and Revision 1 to Attachment 2 Schedule of Items (Att.2 - C5 - Schedule of Items RV1 8.21.2026). All changes are highlighted in red font.

Continued ...

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

(Signature of person authorized to sign) (Signature of Contracting Officer)

LUCAS J. DAHLMAN

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

Previous edition unusable

Except as provided herein, all terms and conditions of the document referenced in Item 9 A or 10A, as heretofore changed, remains unchanged and in full force and effect .

ITEM NO. SUPPLIES/SERVICES QUANTITY UNIT UNIT PRICE AMOUNT

NAME OF OFFEROR OR CONTRACTOR

2 5CONTINUATION SHEET

REFERENCE NO. OF DOCUMENT BEING CONTINUED PAGE OF

(A) (B) (C) (D) (E) (F)

1240LT26Q0168/0001

3. The period of performance end date has changed from July 31, 2027 to September 30, 2027.

Point of contact for this amendment is Contract

Specialist Holly Hlavac at Holly.Hlavac@usda.gov.

Period of Performance: 09/30/2026 to 09/30/2027

NSN 7540-01-152-8067 OPTIONAL FORM 336 (4-86)

Sponsored by GSA

FAR (48 CFR) 53.110

Date: 8/26/2026

SUBJECT: Summary of Changes, Amendment 0001, Consolidated Questions and Answers, Forest Wide Well Decommissioning Mystic River and Custer Ranger Districts, Black Hills National Forest, South Dakota

Contractor Questions:

1. Are all of the well locations accessible with a 4 wheeled F550 truck and a 20ft long trailer U.S. Forest Service Response:

No. The below wells are not accessible with the equipment listed above. They should be able to get within 50’ of the remaining wells.

Map #4 Rifle Pit Well Map #8 South Rockerville Map #16 Slate Prairie Well

2. Does pipe removal include a depth below the ground surface or does flush with the ground surface meet the requirements?

U.S. Forest Service Response:

Steel and concrete pipe is to be removed flush with the surrounding ground.

3. Can cement grout be used, or just bentonite grout?

U.S. Forest Service Response:

Cement grout may be used.

4. Can bentonite chips be used in lieu of grout to fill larger diameter holes?

U.S. Forest Service Response:

Bentonite chips may be used in accordance with South Dakota 74:02:04:69 Requirements for plugging wells or test holes completed into unconfined aquifers with only one aquifer encountered. In Rule 69, bentonite chips fall under the definition of “clay” within that rule. For the wells with casing diameters less than 16 inches, you would need to tremie pipe in the chips.

5. If chips are used, do the chips have to be capped with concrete?

U.S. Forest Service Response:

No. In Rule 69, bentonite chips falls under the definition of “clay” within that rule. If clay (bentonite chips) is to be used as a backfill material, a minimum of two feet of dry bentonite, bentonite grout, or cement grout must be placed at the top of the aquifer. The top three feet of casing or hole, if not filled with clay, bentonite grout, or cement grout, shall be backfilled with native material.

6. Can the Period of Performance delivery date change to September 30, 2027?

U.S. Forest Service Response:

Period of Performance delivery date has changed from July 31, 2027, to September 30, 2027.