Sol_140L4326Q0124_Amd_0002.pdf

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 items 8 and 15, and returning or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT 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.

E. IMPORTANT: is not is required copies to the issuing office.

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

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

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

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

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

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

15C. DATE SIGNED

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

16C. DATE SIGNED

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

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

PAGE

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

Previous edition unusable

PAGESOF

Contractor

The hour and date specified for receipt of Offers to sign this document and return

Christy Webster

See continuation page

BLM OR-ST OFC PROC MGMT BR(OR952)

1220 SW 3rd Avenue, 12th Floor

PORTLAND OR 97204

LHA

140L4326Q0124

10/14/2026

09/18/2026

1 4

CONTINUATION SHEET

REFERENCE NO. OF DOCUMENT BEING CONTINUED PAGES

NAME OF OFFEROR OR CONTRACTOR

SUPPLIES/SERVICES

(B)

UNIT

(D)

UNIT PRICE

(E)

AMOUNT

(F)

OPTIONAL FORM 336 (4-86)

Sponsored by GSA FAR (48 CFR) 53.110

ITEM NO.

(A)

QUANTITY

(C)

NSN 7540-01-152-8067

140L4326Q0124/0002

Amendment P00002 is issued to address questions and extend the quotation window through

10/21/2026 at 2PM PT.

Q. One of the laboratories we are working with asked whether the Government would like the

SOPs for the proposed analytical methods prior to submission of the quote.

A. Yes.

Q. Which accreditation standard does the work need to be completed under?

A. Standard Operating Procedure for the

Persulfate Digestion of Freshwater and the

Determination of Total Nitrogen and Total

Phosphorus by Flow Injection Analysis (FIA).

Associated analytical methods referenced in the required SOP:

Lachat QuikChem Method 10-107-04-4-B (Total

Nitrogen digestion/analysis)

Lachat QuikChem Method 10-115-01-4-B (Total

Phosphorus digestion/analysis)

Ameel 1993 (basis for alkaline persulfate digestion)

QuikChem Method 10-107-04-1-C and EPA 353.2M

(Nitrate-N determination)

QuikChem Method 10-115-01-1-B and EPA 365.1M

(Orthophosphate determination

Q. Could the Government please confirm the physical condition in which the 165 samples will be provided to the contractor and whether thawing or other preparation of frozen samples by the laboratory is permissible prior to analysis?

A. Thawing is permissible

Q. Please confirm whether documentation demonstrating equivalency for these specific methods may be submitted for Government evaluation and, if so, where that documentation should be submitted.

A. Yes, it can be submitted - send to mark.raggon@usda.gov

Q. Will separate sample bottles be provided for

Total Nitrogen (TN) and Total Phosphorus (TP) analysis, or will both analyses need to be performed from a single 60¿75 mL sample bottle?

A. Single bottle

Q. The laboratory performs TN and TP using

Continued...

NAME OF OFFEROR OR CONTRACTOR

SUPPLIES/SERVICES

(B)

UNIT

(D)

UNIT PRICE

(E)

AMOUNT

(F)

OPTIONAL FORM 336 (4-86)

Sponsored by GSA FAR (48 CFR) 53.110

ITEM NO.

(A)

QUANTITY

(C) persulfate digestion under SM 4500 methods rather than the exact Lachat methods specified in the SOW. Amendment 0001 states that alternative methods may be considered if sufficient evidence of equivalency is provided.

Could you please advise what documentation the

Government would require to evaluate and approve an alternative method?

A. ¿ Complete Method Description

¿ Detailed steps, reagents, instrumentation, digestion parameters, analysis technique, alignment with SM¿4500 and Lachat.

¿ Comparative Performance Data

¿Side-by-side studies (replicate analyses) comparing SM¿4500 vs. Lachat across relevant matrices.

¿Including precision, accuracy, detection limits, linear range, bias.

¿ Quality Control and Method Detection Limit

(MDL)

¿ MDL studies per 40¿CFR¿136.6 (e.g., four replicates mid-level standard, blank/ LCS/ matrix spikes, routine QC).

¿ Ongoing QC plan: Method blanks, mid-level

LCS, matrix spikes, calibration verification, control charts. [ecfr.gov], [epa.gov]

¿ Matrix Applicability & Interferences

¿ List sample types intended (wastewater, surface water, digested sludge).

¿ Document potential interferences and corrective actions.

¿ Validation Study Plan and Final Report

(especially for ATP)

¿ QAPP-style plan detailing matrix types, sample counts, acceptance criteria.

¿ Final report with data, statistical assessments, deviation logs, conclusions.

[epa.gov], [nepis.epa.gov]

¿ Equivalency Justification

¿ Clearly state that performance meets or exceeds requirements and SOW criteria.

Amendment P00001 is issued to address questions and change the NAICS to 541715.

Q. Please confirm the anticipated number of samples per delivery or batch throughout the period of performance.

Continued...

NAME OF OFFEROR OR CONTRACTOR

SUPPLIES/SERVICES

(B)

UNIT

(D)

UNIT PRICE

(E)

AMOUNT

(F)

OPTIONAL FORM 336 (4-86)

Sponsored by GSA FAR (48 CFR) 53.110

ITEM NO.

(A)

QUANTITY

(C)

A. 165 samples

Q. Please clarify the anticipated sampling and delivery frequency. For example, should the contractor expect weekly, monthly, periodic, or one-time sample deliveries?

A. One-time delivery

Q. Please confirm the required laboratory turnaround time from receipt of the samples to delivery of analytical results.

A. 60 days

Q. Could you confirm whether a lab using this

SM 4500-based approach for Total Nitrogen

(rather than the exact method specified, if different) would be acceptable for this requirement, or whether strict adherence to the specified method is required?

Q. Strict adherence to the specified method is the default expectation. Use of an alternative method such as SM 4500 for Total Nitrogen may be acceptable only if the laboratory provides sufficient evidence that the method yields results equivalent to the specified Lachat/EPA methods and the Government formally approves the equivalency. If your laboratory wishes to pursue this option, please submit documentation demonstrating equivalency so it can be evaluated.

Water Quality samples for the AREMP Program.

Period of Performance: 10/31/2026 to

03/31/2027

Sponsored by GSA FAR (48 CFR) 53.110