Solicitation Amendment W912P726BA0010003 SF 30.pdf

J 1 402

0003 24 APR 2026 0

W912P7

W075 ENDIST SAN FRAN

KO CONTRACTING DIVISION, 450 GOLDEN GATE AVENUE

SAN FRANCISCO, CA 94102-3406

UNITED STATES

LISA IP, EMAIL: LISA.I.IP@USACE.ARMY.MIL TELEPHONE: 415-503-6877

SCD: PAS:

W912P726BA001

10 APR 2026

SEE SECTION G - CONTRACT ADMINISTRATION DATA

PROJECT TITLE: SAN JOAQUIN/ STOCKTON DWSC FY26 MAINTENANCE DREDGING

PROJECT LOCATION: CONTRA COSTA, SACRAMENTO, AND SAN JOAQUIN COUNTIES, CA

The purpose of Amendment 0003 is to add FAR 52.225-11, 52.225-11 Alt 1, 52.225-12, 52.225-12 Alt II, and 52.240-93, update FAR 52.252-3 and 52.252-4, and to add Sacramento and Stockton Deep Water Ship Channel 2026 Maintenance Dredging Sampling and Analysis Report.

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

This amendment makes changes to the solicitation; these changes represent one of three types, either adding new information, deleting information, or revising existing information. Changes made by this amendment replace the previously issued sections of the advertisement, as referenced in the summary of changes below:

SECTION 00 21 00

Added 52.225-12 Updated 52.252-3

SECTION 00 70 00

Added 52.225-11 (Alternate I), 52.225-12 (Alternate II), and 52.240-93

SECTION 00 72 00

Added 52.225-11 Updated 52.252-4

SPECIFICATIONS:

Added Sacramento and Stockton Deep Water Ship Channel 2026 Maintenance Dredging Sampling and Analysis Report

(End of Summary of Changes)

W912P726BA0010003

Effective Date Alternate/ Deviation

Variation Effective Date

Section 00 21 00 - Instructions

The following clauses were added:

FAR Clauses Incorporated by Reference Number Title

52.225-12 Notice of Buy American Requirement- Construction Materials Under Trade Agreements.

May 2014

The following clauses were modified:

52.252-3 Alterations in Solicitation. Apr 1984 hereby reads as follows:

Alterations in Solicitation (Apr 1984)

Portions of this solicitation are altered as follows:

252.204-7998 Alt A

52.225-12 Alt II

(End of clause)

Section 00 70 00 - Conditions of the Contract Additional Information/Notes The following clauses were added:

FAR Clauses Incorporated by Reference Number Title Effective Date Alternate/

Deviation Variation Effective Date

52.225-11 Buy American-Construction Materials under Trade Agreements. (Deviation 2026-O0038) (Alternate I)

Feb 2026 Alternate I Feb 2026

52.225-12 Notice of Buy American Requirement- Construction Materials Under Trade Agreements. (Alternate II)

May 2014 Alternate II Nov 2023

52.240-93 Basic Safeguarding of Covered Contractor Information Systems. (Deviation 2026-O0038)

Feb 2026

Section 00 72 00 - General Conditions

The following clauses were added:

FAR Clauses Incorporated by Full Text

52.225-11 Buy American-Construction Materials under Trade Agreements. (Deviation 2026-O0038)

(Feb 2026)

Buy American-Construction Materials under Trade Agreements (Feb 2026) (Deviation 2026- O0038)

(a) . As used in this clause-Definitions

Caribbean Basin country construction material means a construction material that-

(1) Is wholly the growth, product, or manufacture of a Caribbean Basin country; or

(2) In the case of a construction material that consists in whole or in part of materials from another country, has been substantially transformed in a Caribbean Basin country into a new and different construction material distinct from the materials from which it was transformed.

Commercially available off-the-shelf (COTS) item-

(1) Means any item of supply (including construction material) that is-

(i) A commercial product (as defined in paragraph (1) of the definition of "commercial product" at Federal Acquisition Regulation (FAR) 2.101);

(ii) Sold in substantial quantities in the commercial marketplace; and

(iii) Offered to the Government, under a contract or subcontract at any tier, without modification, in the same form in which it is sold in the commercial marketplace; and

(2) Does not include bulk cargo, as defined in 46 U.S.C. 40102(4), such as agricultural products and petroleum products.

Component means an article, material, or supply incorporated directly into a construction material.

Construction material means an article, material, or supply brought to the construction site by the Contractor or subcontractor for incorporation into the building or work. The term also includes an item brought to the site preassembled from articles, materials, or supplies. However, emergency life safety systems, such as emergency lighting, fire alarm, and audio evacuation systems, that are discrete systems incorporated into a public building or work and that are produced as complete systems, are evaluated as a single and distinct construction material regardless of when or how the individual parts or components of those systems are delivered to the construction site.

Materials purchased directly by the Government are supplies, not construction material.

Cost of components means-

(1) For components purchased by the Contractor, the acquisition cost, including transportation costs to the place of incorporation into the construction material (whether or not such costs are paid to a domestic firm), and any applicable duty (whether or not a duty-free entry certificate is issued); or

(2) For components manufactured by the Contractor, all costs associated with the manufacture of the component, including transportation costs as described in paragraph (1) of this definition, plus allocable overhead costs, but excluding profit. Cost of components does not include any costs associated with the manufacture of the construction material.

Critical component means a component that is mined, produced, or manufactured in the United States and deemed critical to the U.S. supply chain. The list of critical components is at FAR 25.105.

Critical item means a domestic construction material or domestic end product that is deemed critical to U.S. supply chain resiliency. The list of critical items is at FAR 25.105.

Designated country means any of the following countries:

(1) A World Trade Organization Government Procurement Agreement (WTO GPA) country (Armenia, Aruba, Australia, Austria, Belgium, Bulgaria, Canada, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy, Japan, Korea (Republic of), Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Montenegro, Netherlands, New Zealand, North Macedonia, Norway, Poland, Portugal, Romania, Singapore, Slovak Republic, Slovenia, Spain, Sweden, Switzerland, Taiwan, Ukraine, or United Kingdom);

(2) A Free Trade Agreement (FTA) country (Australia, Bahrain, Chile, Colombia, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Korea (Republic of), Mexico, Morocco, Nicaragua, Oman, Panama, Peru, or Singapore);

(3) A least developed country (Afghanistan, Angola, Bangladesh, Benin, Bhutan, Burkina Faso, Burundi, Cambodia, Central African Republic, Chad, Comoros, Democratic Republic of Congo, Djibouti, Equatorial Guinea, Eritrea, Ethiopia, Gambia, Guinea, Guinea-Bissau, Haiti, Kiribati, Laos, Lesotho, Liberia, Madagascar, Malawi, Mali, Mauritania, Mozambique, Nepal, Niger, Rwanda, Samoa, Sao Tome and Principe, Senegal, Sierra Leone, Solomon Islands, Somalia, South Sudan, Tanzania, Timor-Leste, Togo, Tuvalu, Uganda, Vanuatu, Yemen, or Zambia); or

(4) A Caribbean Basin country (Antigua and Barbuda, Aruba, Bahamas, Barbados, Belize, Bonaire, British Virgin Islands, Curacao, Dominica, Grenada, Guyana, Haiti, Jamaica, Montserrat, Saba, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Sint Eustatius, Sint Maarten, or Trinidad and Tobago).

Designated country construction material means a construction material that is a WTO GPA country construction material, an FTA country construction material, a least developed country construction material, or a Caribbean Basin country construction material.

Domestic construction material means-

(1) For construction material that does not consist wholly or predominantly of iron or steel or a combination of both-

(i) An unmanufactured construction material mined or produced in the United States; or

(ii) A construction material manufactured in the United States, if-

(A) The cost of its components mined, produced, or manufactured in the United States exceeds 60 percent of the cost of all its components, except that the percentage will be 65 percent for items delivered in calendar years 2024 through 2028 and 75 percent for items delivered starting in calendar year 2029. Components of foreign origin of the same class or kind for which nonavailability determinations have been made are treated as domestic. Components of unknown origin are treated as foreign; or

(B) The construction material is a COTS item; or

(2) For construction material that consists wholly or predominantly of iron or steel or a combination of both, a construction material manufactured in the United States if the cost of foreign iron and steel constitutes less than 5 percent of the cost of all components used in such construction material. The cost of foreign iron and steel includes but is not limited to the cost of foreign iron or steel mill products (such as bar, billet, slab, wire, plate, or sheet), castings, or forgings utilized in the manufacture of the construction material and a good faith estimate of the cost of all foreign iron or steel components excluding COTS fasteners. Iron or steel components of unknown origin are treated as foreign. If the construction material contains multiple components, the cost of all the materials used in such construction material is calculated in accordance with the definition of "cost of components".

Fastener means a hardware device that mechanically joins or affixes two or more objects together.

Examples of fasteners are nuts, bolts, pins, rivets, nails, clips, and screws.

Foreign construction material means a construction material other than a domestic construction material.

Foreign iron and steel means iron or steel products not produced in the United States. Produced in the United States means that all manufacturing processes of the iron or steel must take place in the United States, from the initial melting stage through the application of coatings, except metallurgical processes involving refinement of steel additives. The origin of the elements of the iron or steel is not relevant to the determination of whether it is domestic or foreign.

Free Trade Agreement country construction material means a construction material that-

(1) Is wholly the growth, product, or manufacture of a Free Trade Agreement (FTA) country; or

(2) In the case of a construction material that consists in whole or in part of materials from another country, has been substantially transformed in a FTA country into a new and different construction material distinct from the materials from which it was transformed.

Least developed country construction material means a construction material that-

(1) Is wholly the growth, product, or manufacture of a least developed country; or

(2) In the case of a construction material that consists in whole or in part of materials from another country, has been substantially transformed in a least developed country into a new and different construction material distinct from the materials from which it was transformed.

Predominantly of iron or steel or a combination of both means that the cost of the iron and steel content exceeds 50 percent of the total cost of all its components. The cost of iron and steel is the cost of the iron or steel mill products (such as bar, billet, slab, wire, plate, or sheet), castings, or forgings utilized in the manufacture of the product and a good faith estimate of the cost of iron or steel components excluding COTS fasteners.

Steel means an alloy that includes at least 50 percent iron, between 0.02 and 2 percent carbon, and may include other elements.

United States means the 50 States, the District of Columbia, and outlying areas.

WTO GPA country construction material means a construction material that-

(1) Is wholly the growth, product, or manufacture of a WTO GPA country; or

(2) In the case of a construction material that consists in whole or in part of materials from another country, has been substantially transformed in a WTO GPA country into a new and different construction material distinct from the materials from which it was transformed.

(b) Construction materials.

(1) This clause implements 41 U.S.C. chapter 83, Buy American, by providing a preference for domestic construction material. In accordance with 41 U.S.C.1907, the domestic content test of the Buy American statute is waived for construction material that is a COTS item, except that for construction material that consists wholly or predominantly of iron or steel or a combination of both, the domestic content test is applied only to the iron and steel content of the construction material, excluding COTS fasteners. In addition, the Contracting Officer has determined that the WTO GPA and Free Trade Agreements (FTAs) apply to this acquisition. Therefore, the Buy American restrictions are waived for designated country construction materials.

(2) The Contractor shall use only domestic or designated country construction material in performing this contract, except as provided in paragraphs (b)(3) and (b)(4) of this clause.

(3) The requirement in paragraph (b)(2) of this clause does not apply to information technology that is a commercial product or to the construction materials or components listed by the Government as follows:

_None_

(4) The Contracting Officer may add other foreign construction material to the list in paragraph (b)

(3) of this clause if the Government determines that-

(i) The cost of domestic construction material would be unreasonable.

(A) For domestic construction material that is not a critical item or does not contain critical .components

(1) The cost of a particular domestic construction material subject to the restrictions of the Buy American statute is unreasonable when the cost of such material exceeds the cost of foreign material by more than 20 percent;

(2) [Reserved]

(3) [Reserved]

(B) .For domestic construction material that is a critical item or contains critical components

(1) The cost of a particular domestic construction material that is a critical item or contains critical components, subject to the requirements of the Buy American statute, is unreasonable when the cost of such material exceeds the cost of foreign material by more than 20 percent plus the additional preference factor identified for the critical item or construction material containing critical components listed at FAR 25.105.

(2) [Reserved]

(3) [Reserved]

(ii) The application of the restriction of the Buy American statute to a particular construction material would be impracticable or inconsistent with the public interest; or

(iii) The construction material is not mined, produced, or manufactured in the United States in sufficient and reasonably available commercial quantities of a satisfactory quality.

(c) Request for determination of inapplicability of the Buy American statute.

(1)

(i) Any Contractor request to use foreign construction material in accordance with paragraph (b)(4) of this clause shall include adequate information for Government evaluation of the request, including-

(A) A description of the foreign and domestic construction materials;

(B) Unit of measure;

(C) Quantity;

(D) Price;

(E) Time of delivery or availability;

(F) Location of the construction project;

(G) Name and address of the proposed supplier; and

(H) A detailed justification of the reason for use of foreign construction materials cited in accordance with paragraph (b)(3) of this clause.

(ii) A request based on unreasonable cost shall include a reasonable survey of the market and a completed price comparison table in the format in paragraph (d) of this clause.

(iii) The price of construction material shall include all delivery costs to the construction site and any applicable duty (whether or not a duty-free certificate may be issued).

(iv) Any Contractor request for a determination submitted after contract award shall explain why the Contractor could not reasonably foresee the need for such determination and could not have requested the determination before contract award. If the Contractor does not submit a satisfactory explanation, the Contracting Officer need not make a determination.

(2) If the Government determines after contract award that an exception to the Buy American statute applies and the Contracting Officer and the Contractor negotiate adequate consideration, the Contracting Officer will modify the contract to allow use of the foreign construction material.

However, when the basis for the exception is the unreasonable price of a domestic construction material, adequate consideration is not less than the differential established in paragraph (b)(4)(i) of this clause.

(3) Unless the Government determines that an exception to the Buy American statute applies, use of foreign construction material is noncompliant with the Buy American statute.

(d) . To permit evaluation of requests under paragraph (c) of this clause based onData unreasonable cost, the Contractor shall include the following information and any applicable supporting data based on the survey of suppliers:

Foreign and Domestic Construction Materials Price Comparison

Construction material description Unit of measure Quantity Price (dollars)*

Item 1:

Foreign construction material.

Domestic construction material.

Item 2:

Foreign construction material.

Domestic construction material.

[* Include all delivery costs to the construction site and any applicable duty (whether or not a duty- )].free entry certificate is issued

[ List name, address, telephone number, and contact for suppliers surveyed. Attach copy of ]response; if oral, attach summary.

[ ]Include other applicable supporting information.

(End of clause)

The following clauses were modified:

52.252-4 Alterations in Contract. Apr 1984 hereby reads as follows:

Alterations in Contract (Apr 1984)

Portions of this contract are altered as follows:

52.219-9 Alt 1

52.225-11 Alt I

52.249-2 Alt 1

(End of clause)

SACRAMENTO AND STOCKTON DEEP WATER SHIP

CHANNELS – 2026 MAINTENANCE DREDGING

SAMPLING AND ANALYSIS REPORT

February 2026

Prepared for

U.S. Army Corps of Engineers

450 Golden Gate Ave, 4th Floor

San Francisco, CA 94103-1398

Prepared by

Pacific EcoRisk

2250 Cordelia Road

Fairfield, CA 94534

Prepared by

DR Reed and Associates, Inc.

42381 Co Rd 68J

Nederland, CO 80466

USACE, San Francisco District Sacramento and Stockton Deep Water Ship Channels

2026 Maintenance Dredging Sampling and Analysis Report

Pacific EcoRisk i

Table of Contents Page

1. INTRODUCTION

1.1 Project Description

1.2 Objectives of the Sediment Investigation

1.3 Organization of this Document

2. FIELD SEDIMENT SAMPLE COLLECTION

2.1 Collection of Sacramento and Stockton Deep Water Ship Channels Sediment Borings . 5

2.1.1 Field Equipment Decontamination Procedure

2.1.2 On- Board Sample Processing Labeling

2.2 Deviations from the Sampling and Analysis Plan

3. SAMPLE PROCESSING

3.1 Homogenization and Compositing of Sediments

3.2 Shipping of Sediment Samples to the Analytical Laboratories

3.2.1 Chain-of-Custody (COC) Protocol

3.3 Deviations from the Sampling and Analysis Plan

4. RESULTS OF LABORATORY ANALYSES

4.1 Sacramento and Stockton Deep Water Ship Channels Sediments: Results of

Physical/Chemical Analyses

4.2 Results of Modified Waste Extraction Analysis of Sacramento and Stockton Deep

Water Ship Channels Sediments

5. QUALITY CONTROL REVIEW

5.1 Conventional and Chemical Analytical Quality Control Summary

6. SUMMARY

6.1 Placement at Dredged Material Placement Sites

6.2 Placement at the Montezuma Wetlands Restoration Project

7. REFERENCES

Appendices

Appendix A Sediment Boring Collection Forms

Appendix B Eurofins Data Reports of the Sediment and mWET Analyses

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List of Figures

Figure 1-1. Location Map: Deep Water Ship Channel Figure 1-2. Vicinity Map: Deep Water Ship Channel

Figure 2-1. Proposed and Actual Sampling Locations: Sacramento and Stockton Deepwater Ship

Channels Figure 2-2. Proposed and Actual Sampling Locations: Sacramento Deepwater Channel

Figure 2-3. Proposed and Actual Sampling Locations: Stockton Deepwater Channel

List of Tables Page

Table 2-1. Sacramento Deep Water Channel Sampling Station Locations and Boring Depths

Achieved Table 2-2. Stockton Deep Water Channel Sampling Station Locations and Boring Depths

Achieved

Table 4-1. Results of Chemical Analyses of Sacramento and Stockton Deep Water Ship

Channels Sediments

Table 4-2. Results of mWET Elutriate Analyses of Sacramento and Stockton Deep Water Ship

Channels Composite Sediments

Table 4-3. Analytes Measured Above MOU Screening Levels Table 5-1. Achieved Detection and Reporting Limits for Sediments

Table 5-2. Achieved Detection and Reporting Limits for Modified Waste Extraction Test

Analytes

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List of Acronyms

C

COC

Composite

Chain-of-custody

CVRWQCB Central Valley Regional Water Quality Control

Board

DDT dichlorodiphenyltrichloroethane

DMPS Dredged Material Placement Sites

DWSC Deep Water Ship Channel

Eurofins Eurofins Calscience ft foot

FY Fiscal year

GPS Global positioning system

HDPE high-density polyethylene

Integral Integral Corp.

ITM Inland testing manual

MDL method detection limit mg/kg milligram/kilogram

MLLW Mean lower low water

MOU Memorandum of Understanding

MRL method reporting limits

MS Matrix Spike

MSD Matrix Spike Duplicate mWET modified waste extraction test

MWRP Montezuma Wetlands Restoration Program ng/kg nanogram per kilogram

OCI organochlorine

PAH polycyclic aromatic hydrocarbon

PCB polychlorinated biphenyl

PER Pacific EcoRisk

QA/QC quality assurance/quality control

S Single

SAC Sacramento

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List of Acronyms (continued)

SAP Sampling and Analysis Plan

SOP Standard Operating Procedures

Sta Station

STK Stockton

TOC total organic carbon

USACE U.S. Army Corps of Engineers

USEPA United Stated Environmental Protection Agency

WAAS Wide Angle Augmentation System yd3 Cubic yards

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1. INTRODUCTION

The United States Army Corps of Engineers (USACE) is planning to conduct maintenance dredging of the Sacramento and Stockton Deep Water Ship Channels (DWSCs) in Federal Fiscal

Year (FY) 2026 through FY 2030 (Figure 1-1 and 1-2). In order to provide the physical and chemical characterization needed to confirm the suitability of the sediment to be dredged from the

Sacramento and Stockton DWSCs for upland placement at dredged material placement sites

(DMPSs) approved by the Central Valley Regional Water Quality Control Board (CVRWQCB), the USACE has contracted DR Reed and Associates Inc. (DR Reed) and Pacific EcoRisk (PER) to perform sampling and testing of DWSC sediments. DR Reed and PER conducted sampling and analyses of these sediments in accordance with the Sacramento and Stockton Deep Water Ship

Channels – Maintenance Dredging Sampling & Analysis Plan For 2027-2032 Suitability

Determination (SAP [USACE 2024]) and as described in the United States Environmental

Protection Agency (USEPA) and USACE Inland Testing Manual (ITM [USEPA/USACE 1998]) to fulfill the requirements described in the CVRWQCB Memorandum of Understanding (MOU)

No. R5-2019-0041, June 2019 (CVRWQCB 2019).

1.1 Project Description

The Sacramento DWSC is located in the Sacramento River in the counties of Sacramento, Yolo, and Solano (Figures 1-1 and 1- 2). The Sacramento DWSC extends from near the unincorporated community of Collinsville in Solano County, up to and including the turning basin for the Port of

Sacramento. Maintenance dredging of the Sacramento DWSC is to be performed to a depth of -30 feet mean lower low water (MLLW) + 2.0 ft allowable over-depth.

The Stockton DWSC is located in the San Joaquin River in the counties of Contra Costa, Sacramento, and San Joaquin (Figures 1-1 and 1- 2). The Stockton DWSC extends from near the city of Pittsburgh in Contra Costa County up to and including the turning basin for the Port of Stockton. Maintenance dredging of the Sacramento DWSC is to be performed to a depth of

-35 ft (MLLW) + 2.0 ft allowable over-depth; a section of the DWSC approximately between

Station (Sta) 2089+00 to Sta 2113+00 is to be performed to a depth of -38.5 ft MLLW + 2.0 ft allowable over-depth.

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1.2 Objectives of the Sediment Investigation

The objective of the current sampling and testing is to evaluate the proposed dredged material to determine whether any potential adverse impacts may occur during removal operations and/or placement at the permitted disposal site. The procedures for sediment sample collection, sample processing and preparation, physical and chemical analyses, and data analysis were presented in a previously approved SAP (USACE 2024) and MOU (CVRWQCB 2019). The specific objectives of the SAP scope-of-work are as follows:

• Collect boring samples from within the designated sampling areas following field protocol detailed in the SAP; and

• Conduct physical (e.g., grain size) and chemical analyses of the Sacramento and Stockton

DWSCs sediments to determine suitability of the material for upland placement at DMPSs approved by CVRWQCB.

1.3 Organization of this Document

Sample collection and handling procedures are discussed in Sections 2 and 3 of this report.

Results of physical and chemical analyses are provided in Section 4. Section 5 discusses quality control (QC) and Section 6 presents the conclusions regarding suitability of the material for placement at a DMPS.

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2. FIELD SEDIMENT SAMPLE COLLECTION

2.1 Collection of Sacramento and Stockton Deep Water Ship Channels Sediment Borings

All sediments were collected in accordance with guidelines and procedures outlined in the SAP

(USACE 2024). All field sampling activities were performed on June 16-20, 23, & 25, 2025, under the direction of Mr. Jeffrey Cotsifas (of PER). Integral Corp. (Integral) provided the sampling vessel, on-board positioning system, and sampling equipment. PER provided a Field

Scientist to assist in sediment bore collection. Sediment borings were collected from 46 designated sites (Figure 2-1). A total of 18 borings were collected from the Sacramento DWSC

(Figure 2-2); A total of 28 borings were collected from the Stockton DWSC (Figure 2-3). Table

2-1 lists site identifiers, GPS coordinates, mudline elevations, and boring penetration depths for the Sacramento DWSC sites. Table 2-2 lists site identifiers, GPS coordinates, mudline elevations, and boring penetration depths for the Stockton DWSC sites. Final site positions were determined with a global positioning system (GPS) that uses U.S. Government Wide

Angle Augmentation System (WAAS) differential correction data to identify each sampling location.

2.1.1 Field Equipment Decontamination Procedure

The deck of the vessel was rinsed clean with site water between stations. All sampling equipment coming in contact with collected sediments was decontaminated between stations using the following procedures:

1. Rinse with site water and wash with scrub brush until free of sediment;

2. Wash with phosphate-free biodegradable soap solution; and

3. Rinse with site water taken from three ft below the surface.

Any sampling equipment that could not be properly cleaned was not used for subsequent sampling activities.

2.1.2 On-Board Sample Processing and Labeling

All sediment borings were collected to the project depth plus over-depth, or until refusal was met, using an appropriate coring device. All borings were placed into food-grade polyethylene bags. While aboard the vessel, samples were temporarily stored on ice (or frozen “blue ice”) within insulated coolers until transport to the laboratory in Fairfield, CA, by PER staff.

2.2 Deviations from the Sampling and Analysis Plan

There were no unusual circumstances encountered during the fieldwork, and no major deviations from the SAP (USACE 2024). The proposed and actual station locations are presented in Figures

2-1 through 2-3. The sediment bore collection forms are presented in Appendix A.

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Table 2-1. Sacramento Deep Water Channel Sampling Station Locations and Boring Depths Achieved.

Sample ID Boring ID Sample Date Latitude

(decimal-deg)A

Longitude

(decimal-deg)A

Mudline

Elevation (ft MLLW)B

Boring

Penetration (ft MLLW)

Total Boring

Depth (ft MLLW)

SAC-2025-C-01

SAC-2025-01 6/23/25 38.07557o -121.76983o -30.8 1.2 -32.0 SAC-2025-02 6/23/25 38.07911o -121.76319o -30.8 1.2 -32.0

SAC-2025-C-02

SAC-2025-03 6/23/25 38.08418o -121.75321o -29.9 2.1 -32.0

SAC-2025-04 6/23/25 38.08745o -121.74731o -29.7 2.3 -32.0 SAC-2025-S-03 SAC-2025-05 6/23/25 38.09888o -121.72873o -31.0 1.0 -32.0

SAC-2025-C-04

SAC-2025-06 6/23/25 38.11269o -121.70892o -31.0 1.0 -32.0

SAC-2025-07 6/23/25 38.11661o -121.70541o -30.0 2.0 -32.0

SAC-2025-C-05

SAC-2025-08 6/23/25 38.12104o -121.70026o -30.6 1.4 -32.0

SAC-2025-09 6/23/25 38.12283o -121.70001o -29.7 2.3 -32.0 SAC-2025-S-06 SAC-2025-10 6/25/25 38.15709o -121.68536o -30.3 1.7 -32.0

SAC-2025-S-07 SAC-2025-11 6/25/25 38.16460o -121.67896o -30.2 1.8 -32.0

SAC-2025-S-08 SAC-2025-12 6/25/25 38.23315o -121.67413o -30.4 1.6 -32.0

SAC-2025-S-09 SAC-2025-13 6/25/25 38.37249o -121.63071o -29.5 2.5 -32.0

SAC-2025-S-10 SAC-2025-14 6/25/25 38.39019o -121.62192o -29.9 2.1 -32.0

SAC-2025-C-11

SAC-2025-15 6/25/25 38.42772o -121.60510o -30.0 2.0 -32.0

SAC-2025-16 6/25/25 38.44389o -121.59764o -29.7 2.3 -32.0

SAC-2025-C-12

SAC-2025-17 6/25/25 38.45221o -121.59377o -30.4 1.6 -32.0

SAC-2025-18 6/25/25 38.46145o -121.58951o -30.4 1.6 -32.0

NOTES:

A - State Plane Coordinate System, California Zone 3, NAD 83.

B - Mudline elevations were determined using a lead-line.

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Table 2-2. Stockton Deep Water Channel Sampling Station Locations and Boring Depths Achieved.

Sample ID Boring ID Sample Date Latitude

(decimal-deg)A

Longitude

(decimal-deg)A

Mudline

Elevation (ft MLLW)B

Boring

Penetration (ft MLLW)

Total Boring

Depth (ft MLLW)

STK-2025-S-01 STK-2025-01 6/19/25 38.02249o -121.80371o -35.4 1.6 -37.0

STK-2025-S-02 STK-2025-02 6/19/25 38.02315o -121.79640o -35.5 1.5 -37.0

STK-2025-S-03 STK-2025-03 6/19/25 38.02780o -121.76897o -36.0 1.0 -37.0

STK-2025-S-04 STK-2025-04 6/19/25 38.02746o -121.75530o -34.3 2.7 -37.0

STK-2025-S-05 STK-2025-05 6/23/25 38.03673o -121.70582o -35.8 1.2 -37.0

STK-2025-S-06 STK-2025-06 6/23/25 38.04299o -121.69788o -35.7 1.3 -37.0

STK-2025-S-07 STK-2025-07 6/20/25 38.05951o -121.68139o -35.0 2.0 -37.0

STK-2025-S-08 STK-2025-08 6/20/25 38.06483o -121.67774o -35.8 1.2 -37.0

STK-2025-S-09 STK-2025-09 6/20/25 38.08760o -121.68087o -34.6 2.4 -37.0

STK-2025-S-10 STK-2025-10 6/20/25 38.09366o -121.67439o -34.6 2.4 -37.0

STK-2025-S-11 STK-2025-11 6/20/25 38.09214o -121.65365o -34.3 2.7 -37.0

STK-2025-S-12 STK-2025-12 6/20/25 38.09643o -121.62984o -34.9 2.1 -37.0

STK-2025-S-13 STK-2025-13 6/20/25 38.10292o -121.60188o -35.9 1.1 -37.0

STK-2025-S-14 STK-2025-14 6/20/25 38.09917o -121.58719o -34.6 2.4 -37.0

STK-2025-S-15 STK-2025-15 6/19/25 38.05835o -121.54949o -36.0 1.0 -37.0

STK-2025-S-16 STK-2025-16 6/19/25 38.05642o -121.53409o -35.9 1.1 -37.0

STK-2025-S-17 STK-2025-17 6/18/25 38.03074o -121.47749o -35.5 1.5 -37.0

STK-2025-S-18 STK-2025-18 6/18/25 37.99461o -121.43827o -35.4 1.6 -37.0

STK-2025-S-19 STK-2025-19 6/18/25 37.99277o -121.40903o -35.0 2.0 -37.0

STK-2025-C-20

STK-2025-20 6/18/25 37.97420o -121.37807o -35.2 1.8 -37.0

STK-2025-21 6/18/25 37.96924o -121.37151o -35.8 1.2 -37.0

STK-2025-22 6/18/25 37.96725o -121.36916o -35.4 1.6 -37.0

STK-2025-C-21

STK-2025-23 6/18/25 37.95726o -121.35629o -35.2 1.8 -37.0

STK-2025-24 6/17/25 37.95506o -121.34770o -35.9 1.1 -37.0

STK-2025-25 6/17/25 37.95399o -121.34565o -34.8 2.2 -37.0 STK-2025-S-22 STK-2025-26 6/17/25 37.95347o -121.34251o -35.3 1.7 -37.0

STK-2025-S-23 STK-2025-27 6/18/25 37.95104o -121.33649o -39.4 1.1 -40.5

STK-2025-S-24 STK-2025-28 6/16/25 37.95226o -121.32555o -36.3 0.7 -37.0

NOTES:

A - State Plane Coordinate System, California Zone 3, NAD 83.

B - Mudline elevations were determined using a lead-line.

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3. SAMPLE PROCESSING

3.1 Homogenization and Compositing of Sediments

Homogenization and compositing of individual sediment borings was performed at the PER laboratory facility in Fairfield, CA. Each boring was individually homogenized in a stainless-steel bowl or high-density polyethylene (HDPE) container. A 500-mL sub-sample of the resulting homogenized sediment was archived to allow for additional chemical analyses, if necessary; archived samples are being stored frozen at -20˚C for up to one [1] year after sample collection

Each sample was identified by a unique number (Table 2-1). For individual borings, the unique numbering was in the form of SAC/STK-2025-X. For samples to be analyzed, the unique numbering was in the form of SAC/STK-2025-S/C-Y.

• SAC denotes that this sample was collected from the Sacramento DWSC; STK denotes

Stockton DWSC.

• 2025 denotes the year that the sample was collected.

• X was the unique sequential number for each individual discrete sample.

• S/C denotes whether the sample was analyzed as a single (S) or composite (C) sample.

• Y was the unique sequential number for each sample to be analyzed.

Composite (C) samples were prepared by compositing proportionate amounts of the homogenized sediment from the proper borings. Sub-samples of the composited sediments were frozen for archival storage as described above. Samples of the composited project dredge depth sediments (C) were submitted for chemical and conventional analyses along with the single (S) samples.

3.2 Shipping of Sediment Samples to the Analytical Laboratories

Prior to shipping to the analytical laboratory, sample containers were wrapped in bubble wrap and securely packed inside a cooler with ice packs or crushed ice. A temperature blank was included in each cooler. The original signed chain-of-custody (COC) forms were placed inside the lid of each cooler and packaging tape was wrapped completely around each cooler. This

Side

Up arrow labels and a Glass-Handle with Care label were attached on each side and to the top of each cooler, respectively. Each cooler was then sealed with custody seals on both the front and the back lid seams.

The sediment samples were shipped by overnight delivery. The sub-contracting analytical laboratories have been instructed to not dispose of any samples for this project unless notified by PER in writing.

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3.2.1 Chain-of-Custody (COC) Protocol

COC procedures were followed for all samples throughout the collection, handling, and analyses activities. The Sampling and Analysis Project Manager, or a designee, was responsible for all sample tracking and COC procedures. This person was responsible for final sample inventory, maintenance of sample custody documentation, and completion of COC forms prior to transferring samples to the analytical laboratory. A COC form accompanied each cooler of samples to the respective analytical laboratories. Each custodian of the samples signed the COC form; copies of the COC forms are retained in the project file.

3.3 Deviations from the Sampling and Analysis Plan

No deviations from the SAP occurred for sample processing.

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4. RESULTS OF LABORATORY ANALYSES

Sediment physical and chemical characteristics provide information about chemicals of concern present in the sediment and their potential bioavailability, and about non-chemical factors that could affect toxicity.

The Sacramento and Stockton DWSCs sediments were submitted to Eurofins Calscience (Eurofins located in Tustin, CA) for conventional parameters (total solids, TOC, and grain size) and chemical analyses including trace metals, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and organochlorine (OCl) pesticides, as specified in the SAP (USACE

2024). The results of these analyses are presented below in Section 4.1 and Table 4-1. The full

Data Reports submitted by Eurofins for these bulk sediment analyses are provided in Appendix B.

A modified waste extraction test (mWET) was performed for the Sacramento and Stockton

DWSCs composite samples. The results of these mWET analyses are presented in Table 4-2 and

Section 4.2. The full Data Report submitted by Eurofins for the mWET analyses is provided in

Appendix B.

The results of the physical and chemical analysis of the sediments were compared to the MOU

Screening Values. At the request of the USACE, results were also compared to Montezuma Wetlands

Restoration Program (MWRP) screening criteria (SFRWQCB 2012).

4.1 Sacramento and Stockton Deep Water Ship Channels Sediments: Results of

Physical/Chemical Analyses

The results of the analysis of the Sacramento and Stockton Deep Water Ship Channels Sediments samples are presented in Table 4-1. Analytes whose reported concentrations exceeded screening criteria are presented in Table 4-3.

4.2 Results of Modified Waste Extraction Analysis of Sacramento and Stockton Deep

Water Ship Channels Sediments

The results of the analysis of the Sacramento and Stockton Deep Water Ship Channels Sediments

Modified Waste Extraction Tests (mWET) extracts are presented in Table 4-2. Analytes whose reported concentrations exceeded screening criteria are presented in Table 4-3.

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Table 4-1. Results of Chemical Analyses of Sacramento and Stockton Deep Water Ship Channels Sediments.

Analyte SAC-

2025-C-

SAC-

2025-C-

SAC-

2025-S-

SAC-

2025-C-

SAC-

2025-C-

SAC-

2025-S-

SAC-

2025-S-

SAC-

2025-S-

SAC-

2025-S-

SAC-

2025-S-

SAC-

2025-C-

SAC-

2025-C-

STK-

2025-S-

STK-

2025-S-

STK-

2025-S-

STK-

2025-S-

STK-

2025-S-

STK-

2025-S-

MOU

Screening

Value1

MWRP Screening

Criteria3

Cover Foundation

Grain Size (%, dry wt)

Gravel (>2.00 mm) 0 0 0 0 0.49 0.48 0.78 0 0 0 0 0 0.15 0 0 0.79 0 0 -

Sand (0.0625-2.00 mm) 80.37 93.89 100 97.62 98.05 98.14 99.22 97.84 68.03 52.21 0 1.5 97.93 98.58 97.77 96.79 98.06 98.38 -

Silt (0.0039-0.0625 mm) 16.60 4.77 0 1.77 1.47 1.36 0 1.41 25.98 39.71 68.44 70.53 1.46 1.05 1.74 1.74 1.94 1.23 - NA NA

Clay (< 0.0039 mm) 3.04 1.34 0 0.61 0.49 0.48 0 0.75 5.99 8.08 31.56 27.98 0.47 0.37 0.49 0.67 0.50 0.39 -

Percent fines (Silt+Clay) 19.63 6.11 0 2.39 1.96 1.85 0 2.16 31.97 47.79 100 98.5 1.92 1.42 2.23 2.42 1.94 1.62 -

% Solids 59.3 70.8 74.2 73.9 78.5 74.0 78.7 79.2 67.5 62.8 48.5 44.1 77.0 79.1 80.1 81.0 76.8 77.9 - - -

TOC (%) 0.751 1.15 <0.250 0.317 J <0.250 0.258 J <0.250 <0.250 0.733 0.971 1.04 1.03 <0.250 <0.250 <0.250 <0.250 <0.250 <0.250 - - -

Metals (mg/kg, dry wt)

Arsenic 7.83 8.76 4.90 4.35 4.59 4.69 4.96 5.45 6.08 8.23 10.2 10.5 4.24 3.47 6.05 6.05 5.91 4.98 11.62 15.3 70

Cadmium 0.392 0.175 0.0561 0.0986 0.0498 0.0810 0.0856 0.0771 0.300 0.312 0.360 0.349 0.0508 0.0381 0.0503 0.0784 0.0848 0.0628 21 0.33 9.6

Chromium 68.5 48.5 39.5 40.5 39.7 34.3 40.5 36.9 74.7 86.0 121A,B 128A,B 45.4 38.7 36.5 33.1 41.1 33.3 92.92 112 370

Copper 40.4 20.6 10.0 13.1 10.1 15.0 10.2 12.8 43.0 49.5 73.4A,B 80.1A,B 8.76 8.20 9.10 8.68 11.4 9.38 61 68.1 270

Lead 10.6 5.74 4.14 3.97 3.79 3.94 3.45 4.23 7.63 8.81 13.8 14.6 3.82 3.23 4.53 3.28 4.97 3.80 400 43.2 218

Mercury 0.180 0.0706 J <0.0298 0.0419 J <0.0287 0.0320 J <0.0311 0.0348 J 0.126 0.142 0.224A 0.370A <0.0311 <0.0274 <0.0271 <0.0284 0.0323 J <0.0314 0.2 0.43 1.3

Nickel 90.9A 73.7A 51.2 57.9 59.0 53.8 56.3 58.5 117A,B 144A,B 193A,B 200A,B 58.3 54.4 53.3 45.5 58.8 53.0 64.52 112 200

Selenium 0.263 J 0.135 J <0.0987 <0.100 <0.0942 <0.0964 <0.0907 <0.0874 0.225 J 0.264 J 0.386 J 0.385 J <0.0929 <0.0884 <0.0932 <0.0955 <0.0966 <0.0945 390 0.64 1.4

Silver 0.104 0.0386 0.0123 J 0.0148 J 0.0108 J 0.0144 J 0.0115 J 0.0136 J 0.0733 0.0910 0.134 0.150 0.0110 J 0.00696 J 0.0869 J 0.00787 J 0.00996 J 0.00994 J - 0.58 3.7

Zinc 106 74.3 46.4 49.4 38.1 53.9 44.2 53.8 92.1 97.6 134A 143A 40.0 35.4 39.2 32.1 45.7 36.5 120 158 410

PAHs (µg/kg , dry wt)

Acenaphthene <3.4 <2.8 <2.7 <2.7 <2.5 <2.7 <2.5 <2.5 <3.0 <3.2 <4.1 <4.5 <2.6 <2.5 <2.5 <2.5 <2.6 <2.6 3,700,000 - -

Anthracene <2.5 65 <2.0 4.7 J <1.9 10 J <1.9 <1.9 <2.2 <2.4 <3.1 <3.4 <1.9 <1.9 <1.9 <1.9 <1.9 <1.9 22,000,000 - -

Benzo(a)anthracene 10 J 300 <5.2 10 J <5.0 30 <4.9 <4.9 <5.8 <6.2 <8.0 <8.8 <5.1 <4.9 <4.9 <4.8 <5.1 <5.0 620 - -

Benzo(a)pyrene 11 J 430 <6.5 11 J <6.1 57 <6.1 <6.0 <7.1 <7.6 <9.9 <11 <6.2 <6.1 <6.0 <5.9 <6.2 <6.2 620 - -

Benzo(b)fluoranthene 12 J 280 <6.4 9.0 J <6.1 40 <6.0 <6.0 <7.0 <7.6 <9.8 <11 <6.2 <6.0 <5.9 <5.9 <6.2 <6.1 610 - -

Benzo(k)fluoranthene 7.7 J 240A <3.6 6.6 J <3.4 29 <3.4 <3.4 <4.0 <4.4 <5.6 <6.1 <3.5 <3.4 <3.4 <3.3 <3.5 <3.5 62 - -

Chrysene 15 J 360 <3.4 12 J <3.2 36 <3.2 <3.1 5.5 J 5.3 J 7.4 J 9.2 J <3.2 <3.2 <3.1 <3.1 <3.2 <3.2 6,100 - -

Dibenz(a,h)anthracene <5.1 32 <4.1 <4.1 <3.9 <4.1 <3.9 <3.8 <4.5 <4.8 <6.3 <6.9 <4.0 <3.9 <3.8 <3.8 <4.0 <3.9 62 - -

Fluoranthene 44 940 <3.7 34 <3.5 130 <3.5 <3.5 11 J 11 J 13 J 17 J <3.6 <3.5 <3.4 <3.4 <3.6 <3.5 2,300,000 - -

Fluorene <3.1 12 J <2.5 <2.5 <2.4 3.3 J <2.3 <2.3 <2.7 <2.9 <3.8 <4.2 <2.4 <2.3 <2.3 <2.3 <2.4 <2.4 2,600,000 - -

Indeno(1,2,3-c,d)pyrene <6.1 310 <4.9 7.2 J <4.6 46 <4.6 <4.6 <5.4 <5.8 <7.5 <8.2 <4.7 <4.6 <4.6 <4.5 <4.7 <4.7 620 - -

Naphthalene <7.5 <6.3 <6.0 <6.0 <5.7 <6.0 <5.6 <5.6 <6.6 <7.1 <9.2 <10 <5.8 <5.6 <5.6 <5.5 <5.8 <5.7 56,000 - -

Pyrene 53 1,100 <3.8 36 <3.6 150 <3.6 <3.6 12 J 12 J 14 J 19 J <3.7 <3.6 3.6 J <3.5 <3.7 <3.7 2,300,000 - -

∑ detected PAHs 153 4,069B 0 130 0 531 0 0 28.5 28.3 34.4 45.2 0 0 3.6 J 0 0 0 32,965,000 3,390 44,792

Notes:

1 – Screening Value from MOU (CRWQCB 2019).

2 – The mean solids concentration of the sediment will not exceed the mean solids concentration of background soils from the Delta based on a statistical comparison using an approved Title 27 statistical method.

3 - Montezuma Wetlands Restoration Project Waste Discharge Requirements Order No. R2-2012-0087 (SFRWQCB 2012).

J – Analyte detected below the method reporting limit (MRL) and the reported value is therefore an estimate.

All concentrations reported as being below the laboratory MDL are reported above as < the MDL.

A – Value exceeds screening value.

B - Value exceeds MWRP cover screening value (SFRWQCB 2012).

Pacific EcoRisk 15

Table 4-1 (cont). Results of Chemical Analyses of Sacramento and Stockton Deep Water Ship Channels Sediments.

Analyte

STK-

2025-S-07

STK-

2025-S-08

STK-

2025-S-09

STK-

2025-S-10

STK-

2025-S-11

STK-

2025-S-12

STK-

2025-S-13

STK-

2025-S-14

STK-

2025-S-15

STK-

2025-S-16

STK-

2025-S-17

STK-

2025-S-18

STK-

2025-S-19

STK-

2025-C-20

STK-

2025-C-21

STK-

2025-S-22

STK-

2025-S-23

STK-

2025-S-24

MOU

Screening

Value1

MWRP Screening

Criteria3

Cover Foundation

Grain Size (%, dry wt)

Gravel (>2.00 mm) 0 0.15 0 0.13 0 0 0 0.10 0 0 0 7.72 0 0 0.06 0 0 0 -

Sand (0.0625-2.00 mm) 98.25 98.22 90.77 97.34 92.71 94.12 94.65 96.53 90.37 90.62 85.96 0 0 0 0 0 66.90 0 -

Silt (0.0039-0.0625 mm) 1.33 1.18 7.20 1.83 5.50 4.42 4.04 2.59 7.64 7.55 11.45 63.23 67.04 64.54 60.65 69.62 27.70 71.15 - NA NA

Clay (< 0.0039 mm) 0.41 0.45 2.03 0.70 1.79 1.45 1.31 0.78 1.99 1.83 2.58 29.05 32.96 35.46 39.29 30.38 5.40 28.85 -

Percent fines (Silt+Clay) 1.75 1.63 9.24 2.53 7.29 5.88 5.35 3.37 9.63 9.38 14.04 92.28 100 100 99.94 100 33.10 100 -

% Solids 74.5 79.8 73.3 79.2 74.2 70.7 75.6 76.8 73.5 83.4 74.2 45.9 43.2 56.3 58.4 43.7 65.7 55.4 - - -

TOC (%) <0.250 <0.250 <0.250 <0.250 <0.250 <0.250 <0.250 <0.250 <0.250 0.265 J 0.647 0.289 J 1.90 0.774 0.891 1.45 0.314 J 0.779 - - -

Metals (mg/kg, dry wt)

Arsenic 5.68 4.67 5.08 2.93 4.20 5.43 4.09 4.48 1.97 6.40 4.20 4.09 9.36 5.53 6.62 9.50 3.55 8.30 11.62 15.3 70

Cadmium 0.0706 0.0465 0.111 0.0534 0.115 0.145 0.0801 0.0764 0.0448 0.0431 0.0786 0.0590 0.297 0.202 0.186 0.269 0.108 0.317 21 0.33 9.6

Chromium 44.3 26.8 40.1 22.3 37.5 39.8 39.0 45.5 15.5 30.6 18.2 28.3 58.4 46.2 50.0 66.9 27.6 55.0 92.92 112 370

Copper 11.1 7.45 15.5 5.39 17.6 15.1 12.8 11.9 7.48 26.2 12.5 19.6 50.2 38.7 40.9 54.4 17.2 51.5 61 68.1 270

Lead 4.47 3.28 4.85 2.39 5.04 5.30 3.99 3.06 2.42 6.57 4.41 5.72 17.0 13.7 11.5 16.6 5.51 16.8 400 43.2 218

Mercury <0.0303 <0.0288 0.0628 J <0.0290 0.0980 J 0.0728 J 0.0344 J <0.0283 <0.0301 0.126 <0.0292 <0.0473 0.125 J 0.0538 J 0.0975 J 0.143 J 0.0430 J 0.113 J 0.2 0.43 1.3

Nickel 63.9 43.6 55.3 29.6 48.4 53.7 50.8 59.3 19.4 31.3 18.0 25.8 54.1 42.1 47.2 64.1 29.9 52.3 64.52 112 200

Selenium <0.0999 <0.0945 0.105 J <0.0882 <0.0970 0.120 J <0.0944 <0.0972 <0.106 <0.0884 0.142 J <0.162 0.629 J 0.302 J 0.630 0.481 J 0.163 J 0.575 J 390 0.64 1.4

Silver 0.00867 J 0.00649 J 0.0248 J 0.00942 J 0.0224 J 0.0273 J 0.0126 J 0.0163 J 0.0161 J 0.0252 0.0415 0.0408 J 0.172 0.120 0.112 0.156 0.0522 0.221 - 0.58 3.7

Zinc 45.3 27.6 62.5 27.2 59.2 65.5 46.7 39.4 29.5 48.0 33.9 52.4 118 86.7 96.0 135A 55.9 117 120 158 410

PAHs (µg/kg, dry wt)

Acenaphthene <2.7 <2.5 <2.7 <2.5 <2.7 <2.8 <2.6 <2.6 <2.7 <2.4 <2.7 <4.3 <4.6 <3.5 6.9 J <4.6 <3.0 <3.6 3,700,000 - -

Anthracene <2.0 <1.9 <2.0 <1.9 <2.0 <2.1 <2.0 <2.0 <2.0 <1.8 <2.0 <3.3 <3.5 <2.7 <2.6 <3.4 <2.3 <2.7 22,000,000 - -

Benzo(a)anthracene <5.2 <4.9 <5.3 <4.9 <5.3 <5.5 <5.1 <5.1 <5.3 5.6 J <5.3 <8.5 <9.0 <6.9 <6.7 <8.9 <5.9 10 J 620 - -

Benzo(a)pyrene <6.4 <6.0 6.6 J <6.0 <6.5 <6.8 <6.3 <6.2 <6.5 15 <6.5 <10 <11 <8.5 <8.2 <11 <7.3 <8.7 620 - -

Benzo(b)fluoranthene <6.4 <5.9 9.8 J <6.0 <6.4 <6.7 <6.3 <6.2 <6.5 18 <6.4 <10 18 J <8.4 12 J 20 J <7.2 21 610 - -

Benzo(k)fluoranthene <3.6 <3.4 <3.7 <3.4 <3.6 <3.8 <3.6 <3.5 <3.7 <3.2 <3.6 <5.9 <6.3 <4.8 <4.6 <6.2 <4.1 <4.9 62 - -

Chrysene <3.3 <3.1 <3.4 <3.1 <3.4 <3.5 <3.3 <3.3 <3.4 11 J <3.4 <5.4 23 <4.4 12 J 12 J <3.8 17 J 6,100 - -

Dibenz(a,h)anthracene <4.1 <3.8 <4.2 <3.8 <4.1 <4.3 <4.0 <4.0 <4.1 <3.6 <4.1 <6.6 <7.1 <5.4 <5.2 <7.0 <4.6 <5.5 62 - -

Fluoranthene <3.7 <3.4 4.5 J <3.5 <3.7 <3.9 <3.6 <3.6 <3.7 30 <3.7 <6.0 21 J 6.5 J 38 22 J 6.9 J 33 2,300,000 - -

Fluorene <2.5 <2.3 <2.5 <2.3 <2.5 <2.6 <2.4 <2.4 <2.5 <2.2 <2.5 <4.0 <4.3 <3.3 7.3 J <4.2 <2.8 <3.3 2,600,000 - -

Indeno(1,2,3-c,d)pyrene <4.9 <4.6 <5.0 <4.6 <4.9 <5.2 <4.8 <4.8 <5.0 7.9 J <4.9 <7.9 <8.4 <6.5 <6.2 <8.3 <5.5 <6.6 620 - -

Naphthalene <5.9 <5.6 <6.1 <5.6 <6.0 <6.3 <5.9 <5.8 <6.1 <5.3 <6.0 <9.7 <10 <7.9 <7.6 <10 <6.8 <8.0 56,000 - -

Pyrene <3.8 <3.6 8.9 J <3.6 <3.8 <4.0 <3.8 <3.7 <3.9 43 4.4 J <6.2 32 12 J 40 22 J 8.1 J 55 2,300,000 - -

∑ detected PAHs 0 0 29.8 J 0 0 0 0 0 0 130 4.4 J 0 94 18.5 J 116 76 J 15 J 136 32,965,000 3,390 44,792

Notes:

1 – Screening Value from MOU (CRWQCB 2019).

2 – The mean solids concentration of the sediment will not exceed the mean solids concentration of background soils from the Delta based on a statistical comparison using an approved Title 27 statistical method.

3 - Montezuma Wetlands Restoration Project Waste Discharge Requirements Order No. R2-2012-0087 (SFRWQCB 2012).

J – Analyte detected below the method reporting limit (MRL) and the reported value is therefore an estimate.

All concentrations reported as being below the laboratory MDL are reported above as < the MDL.

A – Value exceeds screening value.

Pacific EcoRisk 16

Table 4-1 (cont). Results of Chemical Analyses of Sacramento and Stockton Deep Water Ship Channels Sediments.

Analyte SAC- 2025-C-01

SAC-

2025-C-02

SAC-

2025-S-03

SAC-

2025-C-04

SAC-

2025-C-05

SAC-

2025-S-06

SAC-

2025-S-07

SAC-

2025-S-08

SAC-

2025-S-09

SAC-

2025-S-10

SAC-

2025-C-11

SAC-

2025-C-12

STK-

2025-S-01

STK-

2025-S-02

STK-

2025-S-03

STK-

2025-S-04

STK-

2025-S-05

STK-

2025-S-06

MOU

Screening

Value1

MWRP Screening Criteria3

Cover Foundation PCBs (µg/kg, dry wt)

PCB…