Attachment_3-The_Purpose_of_This_Amendment_1_0001.pdf

Attachment 3-The Purpose of This Amendment 1

A. The purpose of this amendment is to provide questions and answers, changes in the Brand

Name or Equal Products, and extend the quotation due date, and change the period of performance.

B. Please see Attachment A-Final Questions and Answers (These constitute the final questions and answers. The Government will not accept any additional questions)

C. Changed the Brand Name or Equal Products as follows:

C.1 Included the method description and method citation for each constituent in the specifications section for the 7.5-7.7N Ultrex Nitric Acid and the 4.5 N Sulfuric Acid:

Nitric Acid:

From:

Section D 1) 2.0 mL, 7.5-7.7N Ultrex grade nitric acid solution (JT Baker), in a 4.5 mL polypropylene (PP) copolymer screw cap vial (polyvials).

d) Contamination levels of the following metal constituents shall be less than the report levels described below when prepared to the equivalent of 1 vial volume added to 250 mL of deionized water.

Constituent Report Level Unit

Ag 1.0 µg/L

Al 2.0 µg/L

As 0.1 µg/L

B 2.0 µg/L

Ba 0.1 µg/L

Be 0.01 µg/L

Cd 0.03 µg/L

Co 0.03 µg/L

Cr 0.5 µg/L

Cu 0.4 µg/L

Fe 5.0 µg/L

Li 0.15 µg/L

K 0.004 mg/L

Mn 0.4 µg/L

Mo 0.05 µg/L

Ni 0.2 µg/L

Pb 0.03 µg/L

Se 0.05 µg/L

Sb 0.06 µg/L

Sr 0.5 µg/L

V 0.1 µg/L

Zn 2.0 µg/L

Ca 0.02 mg/L

Mg 0.01 mg/L

Na 0.04 mg/L

Silica 0.05 mg/L

U 0.03 µg/L

W 0.03 µg/L

To:

Section D 1) 2.0 mL, 7.5-7.7N Ultrex grade nitric acid solution (JT Baker), in a 4.5 mL polypropylene (PP) copolymer screw cap vial (polyvials).

d) Contamination levels of the following metal constituents shall be less than the report levels described below when prepared to the equivalent of 1 vial volume added to 250 mL of deionized water.

Constituent Report

Level

Unit Method Description Method Number

Ag 1.0 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Al 2.0 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

As 0.1 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

B 2.0 µg/L Metals, filtered water, add, Inductively coupled plasma-atomic emission spectrometry

USGS OF 96-149

Ba 0.1 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Be 0.01 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Cd 0.03 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Co 0.03 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Cr 0.5 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Cu 0.4 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Fe 5.0 µg/L Metals, filtered water, Inductively coupled plasma-atomic emission spectrometry (NWQL)

USGS OF 93-125,

p 101

Li 0.15 µg/L Metals in Water by ICP-MS

(NWQL)

USGS OF 92-634

K 0.004 mg/L Potassium at low concentrations in filtered water by ICP-OES

Standard Method

3120 ICP

Mn 0.4 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Mo 0.05 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Ni 0.2 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Pb 0.03 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Se 0.05 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Sb 0.06 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Sr 0.5 µg/L Metals in Water by ICP-MS

(NWQL)

USGS OF 92-634

V 0.1 µg/L Elements in filtered water using collision/reaction cell

USGS TMR 5-B1

inductively coupled plasma-mass spectrometry

Zn 2.0 µg/L Elements in filtered water using collision/reaction cell inductively coupled plasma-mass spectrometry

USGS TMR 5-B1

Ca 0.02 mg/L Metals, filtered water, Inductively coupled plasma-atomic emission spectrometry (NWQL)

USGS OF 93-125,

p 101

Mg 0.01 mg/L Metals, filtered water, Inductively coupled plasma-atomic emission spectrometry (NWQL)

USGS OF 93-125,

p 101

Na 0.04 mg/L Metals, filtered water, Inductively coupled plasma-atomic emission spectrometry (NWQL)

USGS OF 93-125,

p 101

Silica 0.05 mg/L Metals, filtered water, Inductively coupled plasma-atomic emission spectrometry (NWQL)

USGS OF 93-125,

p 101

U 0.03 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

W 0.03 µg/L Metals, filtered water, Inductively coupled plasma-mass spectrometry

USGS OF 92-634

Sulfuric Acid:

From:

Section D 2) 1 mL 4.5N sulfuric acid (Trace Metal grade) solution (Fisher Chemical Trace

Metal grade) in a 4.5 mL polypropylene (PP) copolymer screw cap vial (polyvials).

d) Contamination levels of the following nutrient and carbon constituents shall be less than the report levels described below when prepared to the equivalent of one vial volume added to 125 mL deionized water.

Constituents Method Report Level

Dissolved organic carbon

Hi-temp oxidation 0.23 mg/L

N-Ammonia Colorimetric 0.1 mg/L

N-Nitrite + Nitrate Colorimetric 0.02 mg/L

Phosphorus Colorimetric 0.003 mg/L

To:

Section D 2) 1 mL 4.5N sulfuric acid (Trace Metal grade) solution (Fisher Chemical Trace

Metal grade) in a 4.5 mL polypropylene (PP) copolymer screw cap vial (polyvials).

d. Contamination levels of the following nutrient and carbon constituents shall be less than the report levels described below when prepared to the equivalent of one vial volume added to 125 mL deionized water.

Constituents Method Report

Level

Method Description Method Number

Dissolved organic carbon

Hi-temp oxidation

0.23 mg/L Organic carbon (DOC), water, filtered, 0.7 um

GF/F, acid-preserved, high temperature combustion oxidation and non-dispersive infrared spectroscopy

USGS OF 92-480

N-Ammonia Colorimetric 0.1 mg/L Nutrients, filtered water, acidified, alkaline-persulfate digestion, continuous flow (CF) colorimetry

USGS WRI 03-4174

N-Nitrite +

Nitrate

Colorimetric 0.02 mg/L Nitrate + nitrite, filtered-acidified water, enzymatic reduction, Griess Reaction colorimetry, automated discrete analyzer

USGS TMR 5-B8

Phosphorus Colorimetric 0.003 mg/L Phosphorus, filtered water, acidified, acid-persulfate digestion, continuous flow

(CF) colorimetry

USEPA 365.1

C.2 Removed the mercury constituent requirement for the 6N (1:1) OmniTrace HCl and the

Quality Assurance (QASP) (See Attachment 2 - Revised Quality Assurance Surveillance Plan for

Testing)

D. Extended the quotation due date:

FROM:

Electronic Submission of Quotations – Required

Quotations are required to be received no later than close of business 2:30 p.m. Mountain

Daylight Time (MDT) on September 17, 2026. Only electronic quotations will be accepted.

Quotations shall be submitted by e-mail to lisa_williams@ios.doi.gov.

TO:

Electronic Submission of Quotations – Required

Quotations are required to be received no later than close of business 2:30 p.m. Mountain

Daylight Time (MDT) on October 8, 2026. Only electronic quotations will be accepted.

Quotations shall be submitted by e-mail to lisa_williams@ios.doi.gov.

E. Changed the anticipated period of performance to Attachment 1 – Pricing Schedule:

From: September 21, 2026 through September 20, 2028.

To: October 19, 2026 through October 18, 2028.

ALL OTHER TERMS AND CONDITIONS ARE UNCHANGED

mailto:lisa_williams@ios.doi.gov mailto:lisa_williams@ios.doi.gov