Amendment 0003 - Specification ATTACHMENTS.pdf

ARCF 2016 SREL Contract 1

Specification Reference

Attachment to Specification Section 01 74 19 Paragraph 1.1.2:

Environmental Field Exploration Summary Report, Rev. 1, December 2020

Prepared by Kleinfelder, Inc.

20201711.010A/SAC20R115887 Page i of iv October 2, 2020 © 2020 Kleinfelder (Revised December 4, 2020)

ENVIRONMENTAL FIELD EXPLORATION SUMMARY

REPORT

CHARACTERIZATION OF LEVEE MATERIAL

SACRAMENTO RIVER EAST LEVEE – STATIONS

1093+50 TO 1116+15

SACRAMENTO, CALIFORNIA

OCTOBER 2, 2020

(REVISED DECEMBER 4, 2020)

Copyright 2020 Kleinfelder All Rights Reserved

ONLY THE CLIENT OR ITS DESIGNATED REPRESENTATIVES MAY USE THIS DOCUMENT AND ONLY FOR THE SPECIFIC

PROJECT FOR WHICH THIS REPORT WAS PREPARED.

20201711.010A/SAC20R115887 Page ii of iv October 2, 2020

KLEINFELDER 2882 Prospect Park Dr., Suite 200, Rancho Cordova, CA 95670 p | 916.366-1701

October 2, 2020 (Revised December 4, 2020) File No.: 20201711.010A

Mr. Pete Ghelfi, PE Sacramento Area Flood Control Agency 1007 7th Street, 7th Floor Sacramento, California 95814

Subject: Environmental Field Exploration Summary Report

Characterization of Levee Material Sacramento River East Levee – Stations 1093+50 to 1116+15 Sacramento, California

Dear Mr. Ghelfi:

Kleinfelder is pleased to present this Environmental Field Exploration Summary Report for the Sacramento River East Levee (SREL) between Station 1093+50 and 1116+15 as SAFCA supports the United States Army Corps of Engineers (USACE) located in Sacramento, California, in the American River Common Features project. The purpose of this data report is to summarize the environmental testing services performed as part of this project. These services have included the advancement of drilled borings for subsurface exploration and environmental laboratory testing.

If you have questions regarding this data report, or if we may be of further assistance, please contact the undersigned.

Sincerely, KLEINFELDER, INC.

Stacy Mann William F. Schmierer, PG Staff Toxicologist Senior Geologist

Reviewed By:

Timothy A. Williams, PE, GE Program Manager

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TABLE OF CONTENTS

SECTION PAGE

1 INTRODUCTION

1.1 PROJECT BACKGROUND

1.2 PURPOSE AND SCOPE OF SERVICES

2 SOIL BORING INVESTIGATION

2.1 SAMPLES COLLECTED BY GEI CONSULTANTS AND HDR, INC

2.2 EXPLORATION LOCATIONS

2.3 PERMITS

2.4 UTILITY CLEARANCE

2.5 BORINGS

2.6 SOIL BORING SAMPLING PROCEDURE

2.7 ENVIRONMENTAL HAND AUGER SOIL SAMPLING PROCEDURE

2.8 SOIL CLASSIFICATION

2.9 BACKFILLING AND CUTTINGS DISPOSAL

2.10 SAMPLE ANALYSIS

3 DATA VALIDATION, LABORATORY ANALYSIS, AND RESULTS

3.1 DATA VALIDATION

3.2 METALS BY USEPA METHOD 6010B/7414A

3.3 TOTAL PETROLEUM HYDROCARBONS BY USEPA METHOD 8015B

3.4 VOLATILE ORGANIC COMPOUNDS BY USEPA METHOD 8260B

3.5 SEMI-VOLATILE ORGANIC COMPOUNDS (SVOCS) BY USEPA METHOD

8270C

3.6 LANDFILL DISPOSAL REVIEW

4 LIMITATIONS

5 REPORT ACRONYMS

TABLES

1 Metals by USEPA Method 6010B/7414A 2 Total Petroleum Hydrocarbons by USEPA Method 8015B 3 Volatile Organic Compounds by USEPA Method 8260B 4 Semi-Volatile Organic Compounds by USEPA Method 8270C 5 CA-WET Metals by USEPA Method 6010B/7470A 6 GEI/HDR Metals by USEPA Method 6010B/7414A 7 GEI/HDR Total Petroleum Hydrocarbons by USEPA Method 8015B 8 GEI/HDR Volatile Organic Compounds by USEPA Method 8260B 9 GEI/HDR Semi-Volatile Organic Compounds by USEPA Method 8270C

FIGURES

1 Site Vicinity Map 2 Approximate Boring and Jet Grout Wall Locations

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APPENDICES

A Boring Logs B GEI/HDR Boring Logs, Memo, and Notes C Laboratory Data Validation Reports D Level II Laboratory Reports E Level IV Laboratory Reports

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1 INTRODUCTION

1.1 PROJECT BACKGROUND

As a part of the American River Common Features project (Project), the United States Army

Corps of Engineers (USACE) Sacramento District is in the process of finalizing the design of proposed jet grout cutoff walls along the Sacramento River East Levee (SREL). The proposed

Project area is located along the eastern boundary of the Sacramento River and the western boundary of the City of Sacramento, approximately 2 miles south of the Sacramento River’s confluence with the American River. Figure 1 shows the Project site vicinity. Approximately

1,445 combined linear feet of jet grout cutoff walls are proposed between Project Stations

1093+50 and 1116+15. USACE needs subsurface information along the proposed cutoff wall alignments to evaluate the depth to fine-grained key-in material and to characterize the properties of levee degrade materials and jet grout cuttings for disposal at various locations.

The Project will involve the removal of approximately the upper 3.5 to 4 feet of soil along the jet grout alignment.

1.2 PURPOSE AND SCOPE OF SERVICES

The objective of the exploration program is as follows:

Geotechnically characterize and locate the cutoff walls key-in material layers (contained in companion geotechnical report)

Initial characterization of soils within the proposed levee degrade (removal) portion of the cutoff wall alignments for off-site disposal

Initial characterization of deeper soils within the proposed cutoff walls depths for off-site disposal of jet grout returns

To accomplish these objectives, Kleinfelder, Inc. (Kleinfelder), under contract to Sacramento

Area Flood Control Agency (SAFCA), advanced twelve soil borings between Stations 1105+00 and 1116+15. Seventeen hand auger borings were drilled between Stations 1093+50 and

1116+15. In addition, information obtained by GEI Consultants and HDR, Inc. (GEI/HDR) from 2

20201711.010A/SAC20R115887 Page 2 of 13 October 2, 2020 borings drilled at 1093+33 and 1095+77 were reviewed and are included in this report. It is understood the subsurface information collected from explorations used to meet the above objectives will be used in the design and construction of the jet grout cutoff walls.

Findings from these explorations and laboratory testing programs will be included in two companion reports – a geotechnical data report and an environmental characterization report.

This document presents the environmental characterization report.

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2 SOIL BORING INVESTIGATION

This section summarizes the subsurface investigations completed by Kleinfelder, GEI

Consultants, and HDR, Inc. This includes a summary of the field operations and borings completed during all phases of the overall investigation. Kleinfelder boring logs are included as

Appendix A.

2.1 SAMPLES COLLECTED BY GEI CONSULTANTS AND HDR, INC.

GEI/HDR completed two geotechnical soil borings between April 27, 2020 and April 29, 2020 at levee stations 1093+33 and 1095+77. Soil samples were also collected from these borings for environmental chemical analysis to initially characterize jet grout returns. Composite samples were collected from each five-foot run, from each boring down to 90 feet below ground surface

(bgs). Samples were transported under chain-of-custody (COC) procedures to Eurofins

TestAmerica for further compositing and analysis. GEI/HDR’s soil boring logs, PID notes, and sample collection methods are included as Appendix B.

2.2 EXPLORATION LOCATIONS

Kleinfelder’s explorations were located visually using aerial photographs and utility location maps. After the explorations were completed, they were surveyed. Coordinates are provided on the exploration borings as northing and easting using North American Datum 1983. Elevations are in North American Vertical Datum 1988 (NAVD88). Boring locations are shown of Figure 2.

2.3 PERMITS

Soil boring permits were obtained by Kleinfelder from the Sacramento County Environmental

Health Division (SCEHD). An encroachment permit from the City of Sacramento Public Works

Department was acquired to temporarily close the City of Sacramento’s bike trail during the investigations. The City bike trail runs along the top of the levee.

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2.4 UTILITY CLEARANCE

Underground Service Alert (USA) North 811 was contacted a minimum of two business days in advance by Kleinfelder and our drilling subcontractor (Gregg Drilling, Inc.) to provide underground utility clearance for all explorations. Exploration locations were marked by

Kleinfelder in white paint prior to contacting USA. In addition, each location was scanned with ground penetrating radar (GPR) by GPRS, Inc., to further check for potential underground utilities. Each boring location was cleared by GPRS.

2.5 BORINGS

Geotechnical soil samples were collected from borings at 12 locations and shallow soil samples from the levee degrade activities were collected from 17 locations at the site between June 3 and June 16, 2020. Soil boring drilling services were provided by Gregg Drilling, Inc. of

Martinez, California. A truck-mounted sonic drill rig and a track mounted sonic drill rig were used for the duration of the Project. Borings for this investigation were located on top of the levee along the City of Sacramento bike trail. Soil logging for this Project was performed by a

Kleinfelder licensed professional geologist. Of the 12 locations drilled for geotechnical purposes, only 11 of those borings (KS-SR20-001S through KS-SR20-011S) were used for the environmental investigation. Boring logs for the 11 borings are included as Appendix A.

Six boring locations were drilled to a maximum depth of 60 feet bgs. Five boring locations were drilled to a maximum depth of 130 feet bgs. One boring location was drilled to a maximum depth of 140 feet bgs. The soil boring location map is included as Figure 2. Soil boring locations are shown on Figure 2 and sample depths are listed in Tables 1 through 4.

2.6 SOIL BORING SAMPLING PROCEDURE

Samples from the proposed jet grout wall areas were collected during the geotechnical drilling activities. At each 5-foot interval (5-10 feet, 10-15 feet, 15-20 feet, 20-25 feet, 25-30 feet), soil was field composited in a stainless-steel bowl. After the sample was field composited, it was collected in glass jar(s) provided by the laboratory. There were up to four (4) 5-foot interval field composited samples at each boring location. The field-composited samples were later composited by the laboratory into one total composite sample per boring location for all samples

(except the degrade samples). Degrade samples were only field composited.

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As part of the geotechnical drilling program, one environmental sample was collected from each boring, and analyzed for volatile organic compounds (VOCs). The VOC samples were collected in accordance with United States Environmental Protection Agency (USEPA) Method 5035 using TerraCore sampling kits. The soil column (to the water table) was field screened using a photoionization detector (PID) to screen for potential impacts. If no impacts were identified using the PID, a default sample was collected directly above the water table where potential VOC impacts, if any, were expected to be present based on water table fluctuations. The VOC samples were not collected from a composited sample.

Soil samples were placed into a thermally-insulated chest, on ice, in the field, and hand delivered to Eurofins TestAmerica laboratory in West Sacramento, California under COC protocols.

During all sampling activities, in addition to providing a qualitative screening of the soil samples, a PID was also used to monitor the breathing zone due to the proximity of three hazardous waste release sites (Chevron Sacramento Terminal, TOSCO- 76 Broadway, and Former Tosco

Refining Company 66 Broadway) to the area of exploration.

2.7 ENVIRONMENTAL HAND AUGER SOIL SAMPLING PROCEDURE

Soil samples from the levee degrade activities were collected using a hand auger. The hand auger was used to advance a borehole to the top of the planned sampling depth (4 feet bgs).

Soil was field screened using a PID to assess potential impacts. All soil cuttings from 0 to 4 feet bgs in each boring were placed into a stainless-steel bowl and composited. Each composited sample was collected in glass jar(s) provided by the laboratory. Samples selected for VOC analysis were collected in accordance with USEPA Method 5035 using TerraCore sampling kits.

VOC samples were collected using a TerraCore sampler from the area in the soil column with the highest PID field screen. If no impacts were identified using the PID, a default sample was collected at the bottom of the hand auger depth (4 feet bgs). VOC samples were not collected from a composited sample.

2.8 SOIL CLASSIFICATION

Soil boring logging was performed by a Kleinfelder licensed professional geologist. Soil was visually identifying in the field. Field classification of soils was conducted in general accordance with ASTM International (ASTM) D2488 and the Unified Soil Classification System (USCS).

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Soil classifications were reviewed in general accordance with ASTM D2487 and the California

Department of Water Resources (DWR) Logging Manual dated September 2009. Soil classifications are presented on the boring logs included as Appendix A.

2.9 BACKFILLING AND CUTTINGS DISPOSAL

After completion of drilling, the borings were backfilled with neat cement grout in accordance with SCEHD permit requirements. Due to COVID-19 shelter in place orders, Sacramento

County was not present for the grouting, and releases were granted over the phone. Backfilling of all borings consisted of grouting the borehole with neat cement grout via tremie pipe from the termination depth to approximately 5 feet bgs. Clean fill was then used in the upper five feet of the boreholes to match the previous and surrounding conditions. Locations that were advanced in the bike path were patched with hot patch asphalt to match the surrounding the surface.

Excess soil cuttings and fluids were contained in thirteen 55-gallon steel drums. One sample was collected from each of four randomly selected drums and submitted to the laboratory for compositing to one sample and analyzed for constituents described in Section 2.10. Drums were temporarily stored at the City of Sacramento lot located at 1920 Front Street. Drums were removed from the site by Instrat, Inc. and disposed of as non-hazardous waste at Hay Road

Landfill in Dixon, California.

2.10 SAMPLE ANALYSIS

Environmental soil samples were transported under COC documentation to Eurofins

TestAmerica West Sacramento Laboratory. The West Sacramento Laboratory is an accredited

United States Department of Defense (DOD) Quality Systems Manual (QSM) version 5.3 laboratory and fulfills the requirements of International Organization for

Standardization/International Electrotechnical Commission (IOS/IEC) 17025:2017.

Environmental soil samples were analyzed for the following constituents:

California Code of Regulation (CCR) Title 22 (CAM 17) Metals by USEPA Methods

6010B and 7471A (for mercury);

Total petroleum hydrocarbon (TPH) as gasoline by USEPA Method 8260B;

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TPH as diesel and oil by USEPA Method 8015B;

VOCs by USEPA Method 8260B; and

Semi-volatile organic compounds (SVOCs) by USEPA Method 8270C.

Additionally, 10 samples were selected for analysis by the California Waste-Extraction Test (CA-

WET) for CCR Title 22 soluble threshold limit concentration (STLC) evaluation, based on the total concentration of a particular analyte exceeding ten times its STLC value. Based on a discussion with USACE, not all samples exceeding ten times STLC values were analyzed, although, at a minimum, the highest concentration exceeding ten times its STLC value for each constituent were analyzed.

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3 DATA VALIDATION, LABORATORY ANALYSIS, AND RESULTS

Laboratory results analytical results were received from the laboratory and validated using DOD

Stage 2B standards. The validated results were compared to the San Francisco Bay Regional

Water Quality Control Board (SFBRWQCB) Tier 1 Soil Environmental Screening Levels (ESLs) and USEPA Industrial Soil Regional Screening Levels (RSLs) (Tables 1 through 4 and Tables 6 through 9). The Central Valley Regional Water Quality Control Board does not have published screening levels, and generally accepts the SFBRWQCB ESLs for screening purposes. Tables

1 through 4 present that laboratory results for the thirty-one (31) Kleinfelder samples, Table 5 present the results of CA-WET for CCR Title 22 STLC evaluation for select samples, and Tables

6 through 9 present the results for the nine (9) GEI/HSR samples. Laboratory results exceeding screening levels are discussed below. Validation reports are included as Appendix C. Level II

Laboratory reports are included as Appendix D. Level IV Laboratory Reports are included as

Appendix E.

3.1 DATA VALIDATION

All laboratory analytical results were validated at DOD Stage 2b including the GEI/HDR data.

Data validation reports are included as Appendix E.

3.2 METALS BY USEPA METHOD 6010B/7414A

Arsenic was detected in all 40 soil samples at concentrations exceeding either its respective

ESL (0.067 milligrams per kilogram [mg/kg]) and/or RSL (3.0 mg/kg). Arsenic was detected at concentrations ranging from 1.6 J mg/kg (SREL20_064S C3-0429200000) to 17 mg/kg (KS-

SR20-018HA-DG). The J qualifier indicates an estimated concentration, typically between the method detection limit (MDL) and the practical quantitation limit (PQL).

Lead was detected over its ESL (32 mg/kg) in ten of the 40 samples. Lead was detected at concentrations ranging from 3.0 mg/kg (SREL20_064S C3-0428200000) to 270 mg/kg (KS-

SR20-018HA). Lead was not detected in any samples exceeding its RSL (800 mg/kg).

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Nickel was detected over its ESL (86 mg/kg) in one out of 40 samples. Nickel was detected at concentrations ranging from 32 mg/kg in KS-SR20-008S-DG to 91 mg/kg in KS-SR20-003S-

DG. Nickle was not detected in any samples exceeding its RSL (22,000 mg/kg).

Vanadium was detected in all 40 soil samples exceeding its ESL (18 mg/kg). Vanadium was detected at concentrations ranging from 22 mg/kg (SREL20_063S C3-0427201302) to 66 mg/kg

(KS-SR20-005S-COMPOSITE). Vanadium was not detected in any samples exceeding its RSL

(5,800 mg/kg).

Remaining metals were either reported as non-detect or below established ESLs and RSLs.

Analytical results for metals are summarized in Tables 1 and 6. Laboratory reports are included as Appendices D and E.

3.3 TOTAL PETROLEUM HYDROCARBONS BY USEPA METHOD 8015B

Total Petroleum Hydrocarbons as diesel (TPH-d) was detected in 31 out of 40 soil samples, and was detected over its ESL (260 mg/kg) in one of those samples. TPH-d was detected at a concentration of 640 mg/kg in KS-SR20-006S-DG-4.5-5. There is no established RSL for

TPH-d.

TPH as oil (TPH-o) was detected in 26 out of 40 samples. TPH-o was concentrations ranged from an estimated concentration of 4.0 J mg/kg (KS-SR20-010S-DG) to 1,300 mg/kg (KS-SR20-

006S-DG-4.5-5). There is no established ESL or RSL for TPH-o.

Analytical results for TPH-d and TPH-o are summarized in Tables 2 and 7. Laboratory reports are included as Appendices D and E.

3.4 VOLATILE ORGANIC COMPOUNDS BY USEPA METHOD 8260B

Naphthalene was detected over its respective ESL (86 micrograms per kilograms [µg/kg]) and

RSL (8,600 µg/kg) in one out of 40 samples. Naphthalene was detected at a concentration of

12,000 µg/kg in KS-SR20-002S-22.

Remaining VOCs, including TPH as gasoline (TPH-g), were either reported as non-detect or below established ESLs and RSLs. Analytical results for VOCs are summarized in Tables 3 and

8. Laboratory reports are included as Appendices D and E.

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3.5 SEMI-VOLATILE ORGANIC COMPOUNDS (SVOCS) BY USEPA METHOD 8270C

Due to the high viscosity of sample matrix, dilutions were performed of samples for SVOC analyses. These dilutions resulted in elevated reporting limits above most screening level criteria.

Benzo[g,h,i] perylene was detected over its ESL (2,500 µg/kg) in two out of 40 samples.

Benzo[g,h,i] perylene was detected in KS-SR20-002S-DG at an estimated concentration of

34,000 J µg/kg and in KS-SR20-002S-composite at an estimated concentration of 9,600 µg/kg.

There is no established RSL for benzo[g,h,i] perylene.

Fluoranthene was detected over its ESL (690 µg/kg) in two out of 40 samples. Fluoranthene was detected in KS-SR20-002S-DG at an estimated concentration of 35,000 J µg/kg and in KS-

SR20-002S-composite at an estimated concentration of 9,500 J µg/kg. Fluoranthene was not detected in any samples over its respective RSL (300,000,000 µg/kg).

Indeno[1,2,3-c,d] pyrene was detected over its ESL (480 µg/kg) in one out of 40 samples.

Indeno[1,2,3-c,d] pyrene was detected in KS-SR20-002S-composite at an estimated concentration of 5,500 J µg/kg. Indeno[1,2,3-c,d] pyrene was not detected in any samples over its RSL (21,000 µg/kg).

Phenanthrene was detected over its ESL (7,800 µg/kg) in one out of 40 samples. Phenanthrene was detected in KS-SR20-002S-SG at an estimated concentration of 25,000 J µg/kg. There is no established RSL for phenanthrene.

Pyrene was detected over its ESL (45,000 µg/kg) in one out of 40 samples. Pyrene was detected in KS-SR20-002S-DG at an estimated concentration of 53,000 J µg/kg. Pyrene was not detected in any samples over its respective RSL (23,000,000 µg/kg).

Remaining SVOCs were either reported as non-detect or below established ESLs and RSLs.

Analytical results for VOCs are summarized in Tables 4 and 9. Laboratory reports are included as Appendices D and E.

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3.6 LANDFILL DISPOSAL REVIEW

It is understood that disposal of degrade material and jet grout cuttings may be at local landfills.

Sample KS-SR20-018HA, collected at Station 1093+50 within the planned degrade depth, contained 18 milligram per liter (mg/L) of soluble lead. Since the concentration in this sample is in excess of the CCR Title 22 STLC of 5 mg/L, soil in this sample would be classified as hazardous waste. This point is bound to the north by SREL20-063S at Station 1093+00, and to the south by KS-SR20-017. Kleinfelder estimates that the levee degrade for the jet-grout wall will require an excavation that is approximately 12-feet wide, four-feet deep, and 150-feet long between the points bounding this sample. This volume of this excavation is approximately 267 cubic yards of in-place soil. Field sampling planned during a separate Phase 2 Environmental

Site Assessment of this portion of levee may reduce the anticipated volume of hazardous waste.

Disposal of California-regulated hazardous soil can be completed at Class I landfills such as

Chemical Waste Management, Inc.’s Kettleman Hills Landfill in Kettleman City, California or

Clean Harbors’ facility in Buttonwillow, California.

Review of laboratory data for other soils in the levee did not identify significant obstacles to non-hazardous disposal for this degrade material. Class 3 landfills near the Site include Kiefer

Landfill and L&D Landfill, both in Sacramento, and Yolo County Landfill in Davis, California.

Jet grout return waste, which will be a mixture of levee soil and cement jet grout, may be impacted the high pH levels common in cement. If pH in this material is greater than 10.5, the material may have to transported to a Class 2 Landfill, like Republic Service Forward Landfill in

Stockton, California or Recology-Hay Road Landfill in Dixon, California. If pH of this material is greater than 12.5, it may have to be transported to Chemical Waste Management, Inc.’s

Kettleman Hills Landfill in Kettleman City, California for disposal as a federal Resource

Conservation and Recovery Act (RCRA) hazardous waste. Hardened cement waste (no soil) may be accepted at Class 3 landfills discussed above.

All disposal considerations are the discretion of landfills based on their acceptance criteria.

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4 LIMITATIONS

Information contained in this data report is based on our field observations, subsurface explorations completed by Kleinfelder and others, laboratory tests, and our present knowledge of the existing levee conditions. It is possible that soil conditions, including groundwater levels, could vary between or beyond the points explored.

The information included graphic representations attached to this report has been compiled from a variety of sources as referenced herein and are subject to change without notice.

Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of the information presented in this data report.

These documents are not intended for use as land survey products, nor are they designed or intended as construction design documents. The use or misuse of the information contained on these graphic representations is at the sole risk of the party using or misusing the information.

We have prepared this data report in substantial accordance with the generally accepted geotechnical engineering practice as it exists in the site area at the time of our study. No warranty, express or implied, is provided. This data report presents data obtained as a snapshot in time and may be used only by SAFCA and their consultants, and only for the purposes stated. Land use, site conditions (both on site and off site), or other factors may change over time, and additional work may be required with the passage of time. Any party other than the client who wishes to use this data report shall notify Kleinfelder of such intended use. Based on the intended use of the data report, Kleinfelder may require that additional work be performed and that an updated data report be issued. Non-compliance with any of these requirements by the client or anyone else will release Kleinfelder from liability resulting from the use of this data report by any unauthorized party.

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5 REPORT ACRONYMS

ASTM ASTM International

BGS Below Ground Surface

CA-WET California Waste Extraction Test

CCR California Code of Regulation

COC Chain of Custody

DoD United States Department of Defense

DWR Department of Water Resources

ESL SFBRWQCB Environmental Screening Level

GEI/HDR GEI Consultants/HDR, Inc.

IEC International Electrotechnical Commission

IOS International Organization for Standardization

J Estimated Concentration, typically between MDL and PQL

MDL Method Detection Limit

Mg/kg Milligrams per Kilogram

PID Photoionization Detector

PQL Practical Quantitation Limit

QSM Quality Systems Manual

RSL USEPA Regional Screening Level

SAFCA Sacramento Area Flood Control Agency

SCEHD Sacramento County Environmental Health Division

SFBRWQCB San Francisco Bay Regional Water Quality Control Board

SREL Sacramento River East Levee

STLC Soluble Threshold Limit Concentration

SVOC Semi-Volatile Organic Compound

TPH Total Petroleum Hydrocarbons µg/kg Micrograms per Kilogram

USA Underground Service Alert

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

USCS Unified Soil Classification System

VOC Volatile Organic Compounds

20201711.010A/SAC20R115887 October 2, 2020

FIGURES

© OpenStreetMap (and) contributors, CC-BY-SA

Copyright:(c) 2018 Garmin

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SITE VICINITY MAP

Sacramento River East Levee Stations 1085+00 to 1125+00

Sacramento, California

20201711.010A

E. Peirce

The information included on this graphic representation has been compiled from a variety of sources and is subject to change without notice. Kleinfelder makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intended for use as a land survey product nor is it designed or intended as a construction design document. The use or misuse of the information contained on this graphic representation is at the sole risk of the party using or misusing the information.

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Sacramento River East Levee

Stations 1085+00 to 1125+00

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M a ri n a V ie w

D r.

B r o a d w a y

U

S

U

S

Combined Geotechnical Soil Boring and Environmental

Degrade Sample Location (Kleinfelder)

Geotechnical Soil Boring Location Only (Kleinfelder)

Environmental Degrade Boring Sample Location (Kleinfelder)

LEGEND

Approximate Jet Grout Wall Location

S

A

C

R

A

M

E

N

T

O

R

I

V

E

R

STA. 1116+15

STA. 1115+50

STA. 1114+50

STA. 1112+00

STA. 1111+00

STA. 1110+00

STA. 1109+00

STA. 1108+00

STA. 1107+00

STA. 1106+00

STA. 1105+00

STA. 1104+00

STA. 1098+50

STA. 1097+50

STA. 1096+50

STA. 1095+50

STA. 1094+50

STA. 1093+50

STA. 1095+77

SREL20_063S

STA. 1093+00

SREL20_064S

Soil Boring Location (GEI)

AutoCAD SHX Text N

20201711.010A/SAC20R115887 October 2, 2020

TABLES

Table 1 - Metals by USEPA Method 6010B/7414A

Sacramento River East Levee Contract 2

Sacramento, CA

USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 7471A USEPA 6010B

Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Mercury Molybdenum

7440-36-0 7440-38-2 7440-39-3 7440-41-7 7440-43-9 7440-47-3 7440-48-4 7440-50-8 7439-92-1 7439-97-6 7439-98-7 mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg

11 0.067 390 5 1.9 160 23 180 32 13 6.9

470 3 220,000 2,300 980 1,800,000 350 47,000 800 46 5,800

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs Result Result Result Result Result Result Result Result Result Result Result

KS-SR20-001S N KS-SR20-001-Composite 5 25 < 2.2 U 4.9 77 0.26 J 0.15 J 39 10 19 12 0.051 < 1.6 U

KS-SR20-001S N KS-SR20-001S-DG 0 4 < 2.2 U 3.8 J 94 0.29 J 0.12 J 37 8.8 19 20 0.13 < 1.6 U

KS-SR20-002S N KS-SR20-002S-composite 5 25 < 2.3 U 8 120 0.43 0.11 J 57 13 32 17 0.13 1.1 J

KS-SR20-002S N KS-SR20-002S-DG 0 4 < 2.1 U 11 90 0.34 0.15 J 41 11 27 34 0.21 < 1.6 U KS-SR20-003S N KS-SR20-003S-DG 0 4 < 2.2 U 7.3 120 0.39 0.21 J 45 11 30 100 2.6 < 1.6 U KS-SR20-003S N KS-SR20-003S-composite 5 25 < 2.4 U 8.5 110 0.4 0.099 J 61 13 31 11 0.054 J < 1.8 U

KS-SR20-003S FD KS-SR20-997S-composite 5 25 < 2.2 U 7.9 110 0.38 0.097 J 60 13 30 9.8 0.13 J < 1.6 U

KS-SR20-004S N KS-SR20-004S-composite 5 25 < 2.3 UJ 9.2 130 J 0.48 0.077 J 57 J+ 13 33 240 J- 0.048 J+ < 1.7 U

KS-SR20-004S N KS-SR20-004S-DG 0 4 < 2.0 U 4.6 52 0.17 J 0.068 J 32 8.6 15 7.7 0.051 < 1.5 U

KS-SR20-005S N KS-SR20-005S-COMPOSITE 10 30 1.4 J 7.7 150 0.5 0.19 J 59 16 37 10 0.095 < 1.7 U

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5 < 2.0 U 4.5 68 0.21 J 0.16 J 33 9.5 26 67 0.08 < 1.5 U

KS-SR20-006S N KS-SR20-006S-COMPOSITE 5 25 < 2.3 U 7.5 120 0.42 0.099 J 55 13 30 9.9 0.071 < 1.7 U

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5 1.2 J 6.8 66 0.27 J 0.13 J 39 11 19 6.4 0.084 < 1.6 U

KS-SR20-007S N KS-SR20-007S-Composite 5 25 < 2.4 U 6.9 82 0.35 J < 0.12 U 40 10 19 5 0.093 < 1.8 U

KS-SR20-007S N KS-SR20-007S-DG 0 4 < 2.1 UJ 5.6 J- 54 J 0.20 J 0.080 J 31 8.1 J- 17 8.4 J- 0.030 J < 1.6 U KS-SR20-008S N KS-SR20-008S-composite 5 25 < 2.1 U 4.1 J 73 J 0.23 J 0.063 J 51 12 18 J 4.3 J 0.028 J 1.1 J KS-SR20-008S FD KS-SR20-999S-composite 5 25 < 2.1 U 5.2 J 93 J 0.33 J 0.075 J 52 12 23 J 5.8 J 0.022 J < 1.5 U

KS-SR20-008S N KS-SR20-008S-DG 0 4 < 2.2 U 3.1 J 42 0.15 J 0.039 J 28 7.1 13 3.6 0.015 J < 1.6 U

KS-SR20-009S N KS-SR20-009S-Composite 5 25 < 2.2 UJ 4.5 100 J- 0.34 < 0.11 U 42 J+ 10 17 4.6 0.015 J < 1.6 U

KS-SR20-009S N KS-SR20-009S-DG 0 4 < 2.1 U 5.3 60 0.25 J 0.076 J 33 9.5 17 9.3 0.074 < 1.6 U

KS-SR20-010S N KS-SR20-010-Composite 5 25 < 2.1 U 7.6 94 0.36 0.078 J 45 12 24 7 0.24 < 1.6 U

KS-SR20-010S N KS-SR20-010S-DG 0 4 < 2.1 U 3.6 J 47 0.19 J 0.046 J 38 9.2 13 3.7 0.028 J < 1.5 U

KS-SR20-011S N KS-SR20-011S-Composite 5 25 < 1.6 U 9.1 110 0.37 < 0.080 U 45 12 25 7.4 0.088 0.69 J

KS-SR20-011S N KS-SR20-011S-DG 0 4 < 2.4 UJ 4.8 J- 55 J- < 0.12 U < 0.12 U 44 J- 9.4 J- 13 3.8 0.024 J < 1.8 U KS-SR20-013HA N KS-SR20-013HA-DG 0 4 < 2.0 UJ 13 100 J- 0.28 J 0.47 47 J 12 29 91 J- 0.41 < 1.5 U KS-SR20-013HA FD KS-SR20-998 0 4 < 2.1 U 11 90 0.27 J 0.42 42 11 25 90 0.42 < 1.6 U

KS-SR20-014HA N KS-SR20-014HA-DG 0 4 < 2.1 U 11 110 0.49 0.18 J 62 15 41 36 0.063 < 1.5 U

KS-SR20-015HA N KS-SR20-015HA-DG 0 4 < 2.2 U 7.6 130 0.4 0.15 J 60 13 34 31 0.081 < 1.7 U

KS-SR20-016HA N KS-SR20-016HA-DG 0 4 1.1 J- 15 93 J+ 0.26 J 0.20 J 34 J+ 9.8 23 84 J+ 0.11 < 1.6 U

KS-SR20-017HA N KS-SR20-017HA-DG 0 4 < 2.2 U 7.6 59 0.19 J < 0.11 U 30 8.6 17 34 0.22 < 1.6 U

KS-SR20-018HA N KS-SR20-018HA-DG 0 4 < 2.0 U 17 170 0.36 0.43 47 11 47 270 0.32 < 1.5 U

Notes:

USEPA Industrial Soil RSL: United States Environmental Protection Agency Regional Screening Level for industrial soil (THQ=1.0), May 2020.

SFBRWQCB Tier 1 Soil: San Francisco Bay Regional Water Quality Control Board Tier 1 Environmental Screening Level for soil, 2019.

Result exceeds SFBRWQCB Tier 1 for soil

Result exceeds USEPA Industrial Soil RSL

Bold Field Duplicate Pair

+: likely biased high

-: likely biased low

CAS: Chemical Abstract System

FD: field duplicate ft bgs: feet below ground surface

J: result value is estimated mg/kg - milligram per kilogram

N: normal sample

U: analyte was not detected, result is less than the limit of detection

UJ: analyte was not detected, result is less than the limit of detection which is estimated

USEPA: United States Envronmental Protection Agency

USEPA Industrial Soil RSL

Method

Analyte

CAS Number

Unit

SFBRWQCB Tier 1 Soil

Table 1 - Metals by USEPA Method 6010B/7414A

Sacramento, CA

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs

KS-SR20-001S N KS-SR20-001-Composite 5 25

KS-SR20-001S N KS-SR20-001S-DG 0 4

KS-SR20-002S N KS-SR20-002S-composite 5 25

KS-SR20-002S N KS-SR20-002S-DG 0 4

KS-SR20-003S N KS-SR20-003S-DG 0 4

KS-SR20-003S N KS-SR20-003S-composite 5 25

KS-SR20-003S FD KS-SR20-997S-composite 5 25

KS-SR20-004S N KS-SR20-004S-composite 5 25

KS-SR20-004S N KS-SR20-004S-DG 0 4

KS-SR20-005S N KS-SR20-005S-COMPOSITE 10 30

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5

KS-SR20-006S N KS-SR20-006S-COMPOSITE 5 25

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5

KS-SR20-007S N KS-SR20-007S-Composite 5 25

KS-SR20-007S N KS-SR20-007S-DG 0 4

KS-SR20-008S N KS-SR20-008S-composite 5 25

KS-SR20-008S FD KS-SR20-999S-composite 5 25

KS-SR20-008S N KS-SR20-008S-DG 0 4

KS-SR20-009S N KS-SR20-009S-Composite 5 25

KS-SR20-009S N KS-SR20-009S-DG 0 4

KS-SR20-010S N KS-SR20-010-Composite 5 25

KS-SR20-010S N KS-SR20-010S-DG 0 4

KS-SR20-011S N KS-SR20-011S-Composite 5 25

KS-SR20-011S N KS-SR20-011S-DG 0 4

KS-SR20-013HA N KS-SR20-013HA-DG 0 4

KS-SR20-013HA FD KS-SR20-998 0 4

KS-SR20-014HA N KS-SR20-014HA-DG 0 4

KS-SR20-015HA N KS-SR20-015HA-DG 0 4

KS-SR20-016HA N KS-SR20-016HA-DG 0 4

KS-SR20-017HA N KS-SR20-017HA-DG 0 4

KS-SR20-018HA N KS-SR20-018HA-DG 0 4

Notes:

USEPA Industrial Soil RSL: United States Environmental Protection Agency Regional Screening Level for industrial soil (THQ=1.0), May 2020.

SFBRWQCB Tier 1 Soil: San Francisco Bay Regional Water Quality Control Board Tier 1 Environmental Screening Level for soil, 2019.

Result exceeds SFBRWQCB Tier 1 for soil

Result exceeds USEPA Industrial Soil RSL

Bold Field Duplicate Pair

+: likely biased high

-: likely biased low

CAS: Chemical Abstract System

FD: field duplicate ft bgs: feet below ground surface

J: result value is estimated mg/kg - milligram per kilogram

N: normal sample

U: analyte was not detected, result is less than the limit of detection

UJ: analyte was not detected, result is less than the limit of detection which is estimated

USEPA: United States Envronmental Protection Agency

USEPA Industrial Soil RSL

Method

Analyte

CAS Number

Unit

SFBRWQCB Tier 1 Soil

USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B USEPA 6010B

Nickel Selenium Silver Thallium Vanadium Zinc

7440-02-0 7782-49-2 7440-22-4 7440-28-0 7440-62-2 7440-66-6 mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg

86 2.4 25 0.78 18 340

22,000 5,800 5,800 12 5,800 350,000

Result Result Result Result Result Result

44 < 3.3 U < 0.22 U < 1.1 U 37 47

39 < 3.2 U 0.16 J < 1.1 U 36 50

70 < 3.5 U < 0.23 U < 1.2 U 59 58

85 < 3.1 U < 0.21 U < 1.0 U 46 57

91 < 3.3 U < 0.22 U < 1.1 U 58 160 61 < 3.5 U < 0.24 U < 1.2 U 59 51

65 < 3.3 U < 0.22 U < 1.1 U 58 54

61 J < 3.4 U < 0.23 U < 1.1 U 60 J+ 55 J

37 < 3.0 U < 0.20 U < 0.99 U 29 32

62 < 3.5 U < 0.23 U < 1.2 U 66 55

35 < 3.0 U < 0.20 U < 1.0 U 35 46

58 < 3.4 U < 0.23 U < 1.1 U 53 50

43 < 3.3 U < 0.22 U < 1.1 U 36 31

42 < 3.7 U < 0.24 U < 1.2 U 42 33

33 J- < 3.1 U < 0.21 U < 1.0 U 32 29

56 < 3.1 U < 0.21 U < 1.0 U 37 34

58 < 3.1 U < 0.21 U < 1.0 U 43 41

32 < 3.3 U < 0.22 U < 1.1 U 26 21

49 J+ < 3.3 U < 0.22 U < 1.1 U 39 33

38 < 3.2 U < 0.21 U < 1.1 U 35 35

47 < 3.1 U 0.14 J < 1.0 U 46 40

39 < 3.1 U < 0.21 U < 1.0 U 28 26

47 < 2.4 U < 0.16 U < 0.80 U 50 50

53 J- < 3.5 U < 0.24 U < 1.2 U 30 29 J

52 J- < 3.1 U < 0.20 U < 1.0 U 46 J- 120 J

48 < 3.1 U < 0.21 U < 1.0 U 40 97 J

56 < 3.1 U < 0.21 U < 1.0 U 64 78

57 < 3.4 U < 0.22 U < 1.1 U 56 66

44 J+ < 3.1 U < 0.21 U < 1.0 U 35 81 J

34 < 3.2 U < 0.22 U < 1.1 U 32 47

40 < 3.0 U < 0.20 U < 1.0 U 47 240

Table 2 - Total Petroleum Hydrocarbons by USEPA Method 8015B

Sacramento, CA

USEPA 8015B USEPA 8015B

TPH-Standard

Diesel Range

Organics C10-C28

Total C28-C40 hydrocarbons

PHCC10C28 PHCC28C40

mg/kg mg/kg

260 NL

NL NL

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs Result Result

KS-SR20-001S N KS-SR20-001-Composite 5 25 12 55

KS-SR20-001S N KS-SR20-001S-DG 0 4 8.9 J 65 J

KS-SR20-002S N KS-SR20-002S-composite 5 25 50 J 120 J

KS-SR20-002S N KS-SR20-002S-DG 0 4 140 440

KS-SR20-003S N KS-SR20-003S-composite 5 25 19 J 62 J KS-SR20-003S FD KS-SR20-997S-composite 5 25 19 J 120 J

KS-SR20-003S N KS-SR20-003S-DG 0 4 75 380

KS-SR20-004S N KS-SR20-004S-composite 5 25 170 480

KS-SR20-004S N KS-SR20-004S-DG 0 4 70 210

KS-SR20-005S N KS-SR20-005S-COMPOSITE 10 30 22 41

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5 120 J 420 J

KS-SR20-006S N KS-SR20-006S-COMPOSITE 5 25 160 450

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5 640 1300

KS-SR20-007S N KS-SR20-007S-Composite 5 25 0.91 J < 12 U

KS-SR20-007S N KS-SR20-007S-DG 0 4 9.4 13 J

KS-SR20-008S N KS-SR20-008S-composite 5 25 0.63 J < 11 U KS-SR20-008S FD KS-SR20-999S-composite 5 25 < 1.1 U < 11 U

KS-SR20-008S N KS-SR20-008S-DG 0 4 0.93 J < 10 U

KS-SR20-009S N KS-SR20-009S-Composite 5 25 1.9 J 8.3 J

KS-SR20-009S N KS-SR20-009S-DG 0 4 4.9 29

KS-SR20-010S N KS-SR20-010-Composite 5 25 35 120

KS-SR20-010S N KS-SR20-010S-DG 0 4 1.4 J 4.0 J

KS-SR20-011S N KS-SR20-011S-Composite 5 25 2.3 J 10 J

KS-SR20-011S N KS-SR20-011S-DG 0 4 0.74 J < 12 U

KS-SR20-013HA N KS-SR20-013HA-DG 0 4 10 J 96 J

KS-SR20-013HA FD KS-SR20-998 0 4 12 J 100 J

KS-SR20-014HA N KS-SR20-014HA-DG 0 4 11 66

KS-SR20-015HA N KS-SR20-015HA-DG 0 4 4.8 26 J

KS-SR20-016HA N KS-SR20-016HA-DG 0 4 6.8 J 55 J

KS-SR20-017HA N KS-SR20-017HA-DG 0 4 5.8 J 47 J

KS-SR20-018HA N KS-SR20-018HA-DG 0 4 41 J- 240 J-

Notes:

USEPA Industrial Soil RSL: United States Environmental Protection Agency Regional Screening Level for industrial soil (THQ=1.0), May 2020.

SFBRWQCB Tier 1 Soil: San Francisco Bay Regional Water Quality Control Board Tier 1 Environmental Screening Level for soil, 2019.

Result exceeds SFBRWQCB Tier 1 for soil

Result exceeds USEPA Industrial Soil RSL

Bold Field Duplicate Pair

+: likely biased high

-: likely biased low

CAS: Chemical Abstract System

FD: field duplicate ft bgs: feet below ground surface

J: result value is estimated mg/kg - milligram per kilogram

N: normal sample

NL: screening level not listed

U: analyte was not detected, result is less than the limit of detection

UJ: analyte was not detected, result is less than the limit of detection which is estimated

USEPA: United States Envronmental Protection Agency

USEPA Industrial Soil RSL

Method

Analyte

CAS Number

SFBRWQCB TIER 1 SOIL

Table 3 - Volatile Organic Compounds by USEPA Method 8260B

Sacramento, CA

USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B USEPA 8260B

1,1,1,2-

Tetrachloroethane

1,1,1-

Trichloroethane

1,1,2,2-

Tetrachloroethane

1,1,2-Trichloro-

1,2,2-trifluoroethane

1,1,2-

Trichloroethane 1,1-Dichloroethane

1,1-

Dichloroethylene

1,1-

Dichloropropene

1,2,3-

Trichlorobenzene

1,2,3-

Trichloropropane

1,2,4-

Trichlorobenzene

630-20-6 71-55-6 79-34-5 76-13-1 79-00-5 75-34-3 75-35-4 563-58-6 87-61-6 96-18-4 120-82-1 µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg µg/kg

17 7,000 18 NL 76 200 540 NL NL 0.11 1,200

8,800 36,000,000 2,700 28,000,000 5,000 16,000 1,000,000 NL 930,000 110 110,000

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs Result Result Result Result Result Result Result Result Result Result Result

KS-SR20-001S N KS-SR20-001S-17' 17 17 < 1.0 U < 1.0 U < 2.1 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-001S N KS-SR20-001S-DG-3.5 3.5 4 < 0.95 U < 0.95 U < 1.9 U < 0.95 U < 0.95 U < 0.95 U < 0.95 U < 0.95 U < 1.9 U < 1.9 U < 1.9 U

KS-SR20-002S N KS-SR20-002S-22' 22 22 < 130 U < 63 U < 63 U < 63 U < 63 U < 63 U < 130 U < 130 U < 130 U < 130 U < 63 U

KS-SR20-002S N KS-SR20-002S-DG-3.5 3.5 4 < 0.98 U < 0.98 U < 2.0 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 2.0 U < 2.0 U < 2.0 U KS-SR20-003S N KS-SR20-003S-21' 21 21 < 1.0 UJ < 1.0 UJ < 2.0 UJ < 1.0 UJ < 1.0 UJ < 1.0 UJ < 1.0 UJ < 1.0 UJ < 2.0 UJ < 2.0 UJ < 2.0 UJ KS-SR20-003S FD KS-SR20-997S-99 21 21 < 0.94 U < 0.94 U < 1.9 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 1.9 U < 1.9 U < 1.9 U

KS-SR20-003S N KS-SR20-003S-DG-3.5-4 3.5 4 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-004S N KS-SR20-004S-12' 12 12 < 1.1 U < 1.1 U < 2.3 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.3 U < 2.3 U < 2.3 U

KS-SR20-004S N KS-SR20-004S-DG-0-1 0 1 < 0.91 U < 0.91 U < 1.8 U < 0.91 U < 0.91 U < 0.91 U < 0.91 U < 0.91 U < 1.8 U < 1.8 U < 1.8 U

KS-SR20-005S N KS-SR20-005S-10 10 10 < 0.98 U < 0.98 U < 2.0 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 2.0 U < 2.0 U < 2.0 U

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5 < 0.94 U < 0.94 U < 1.9 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 1.9 U < 1.9 U < 1.9 U

KS-SR20-006S N KS-SR20-006S-24' 24 24 < 1.2 U < 1.2 U < 2.3 U < 1.2 U < 1.2 U < 1.2 U < 1.2 U < 1.2 U < 2.3 U < 2.3 U < 2.3 U

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-007S N KS-SR20-007S-29' 29 29 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-007S N KS-SR20-007S-DG-0-1 0 1 < 0.88 U < 0.88 U < 1.8 U < 0.88 U < 0.88 U < 0.88 U < 0.88 U < 0.88 U < 1.8 U < 1.8 U < 1.8 U KS-SR20-008S N KS-SR20-008S-28' 28 28 < 0.94 U < 0.94 U < 1.9 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 0.94 U < 1.9 U < 1.9 U < 1.9 U KS-SR20-008S FD KS-SR20-999S-99' 28 28 < 1.2 U < 1.2 U < 2.4 U < 1.2 U < 1.2 U < 1.2 U < 1.2 U < 1.2 U < 2.4 U < 2.4 U < 2.4 U

KS-SR20-008S N KS-SR20-008S-DG-4-5 4 5 < 1.0 U < 1.0 U < 2.1 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-009S N KS-SR20-009S-29' 29 29 < 1.0 U < 1.0 U < 2.0 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 2.0 U < 2.0 U < 2.0 U

KS-SR20-009S N KS-SR20-009S-DG-4-5 4 5 < 1.1 U < 1.1 U < 2.2 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.2 U < 2.2 U < 2.2 U

KS-SR20-010S N KS-SR20-010S-11' 11 11 < 0.85 U < 0.85 U < 1.7 U < 0.85 U < 0.85 U < 0.85 U < 0.85 U < 0.85 U < 1.7 U < 1.7 U < 1.7 U

KS-SR20-010S N KS-SR20-010S-DG-4-5 4 5 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-011S N KS-SR20-011S-26' 26 26 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-011S N KS-SR20-011S-DG-3.5-4 3.5 4 < 1.1 U < 1.1 U < 2.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 1.1 U < 2.1 U < 2.1 U < 2.1 U KS-SR20-013HA N KS-SR20-013HA-3.5' 3.5 3.5 < 0.97 U < 0.97 U < 1.9 U < 0.97 U < 0.97 U < 0.97 U < 0.97 U < 0.97 U < 1.9 U < 1.9 U < 1.9 U KS-SR20-013HA FD KS-SR20-998 0 4 < 0.99 U < 0.96 U < 1.9 U < 0.96 U < 0.99 U < 0.96 U < 0.96 U < 0.96 U < 1.9 U < 1.9 U < 1.9 U

KS-SR20-014HA N KS-SR20-014HA-DG-2.5' 2.5 2.5 < 0.82 U < 0.82 U < 1.6 U < 0.82 U < 0.82 U < 0.82 U < 0.82 U < 0.82 U < 1.6 U < 1.6 U < 1.6 U

KS-SR20-015HA N KS-SR20-015HA-DG-4' 4 4 < 0.98 U < 0.98 U < 2.0 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 0.98 U < 2.0 U < 2.0 U < 2.0 U

KS-SR20-016HA N KS-SR20-016HA-DG-4' 4 4 < 1.0 U < 1.0 U < 2.1 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 1.0 U < 2.1 U < 2.1 U < 2.1 U

KS-SR20-017HA N KS-SR20-017HA-DG-3.5' 3.5 3.5 < 0.99 UJ < 0.99 UJ < 2.0 UJ < 0.99 UJ < 1.0 U < 0.99 UJ < 0.99 UJ < 0.99 UJ < 2.0 UJ < 2.0 UJ < 2.0 UJ

KS-SR20-018HA N KS-SR20-018HA-DG-3' 3 3 < 0.84 U < 0.84 U < 1.7 U < 0.84 U < 0.84 U < 0.84 U < 0.84 U < 0.84 U < 1.7 U < 1.7 U < 1.7 U

Notes:

USEPA Industrial Soil RSL: United States Environmental Protection Agency Regional Screening Level for industrial soil (THQ=1.0), May 2020.

SFBRWQCB Tier 1 Soil: San Francisco Bay Regional Water Quality Control Board Tier 1 Environmental Screening Level for soil, 2019.

Result exceeds SFBRWQCB Tier 1 for soil

Result exceeds USEPA Industrial Soil RSL

Bold Field Duplicate Pair

+: likely biased high

-: likely biased low

CAS: Chemical Abstract System

FD: field duplicate ft bgs: feet below ground surface

J: result value is estimated µg/kg - microgram per kilogram

N: normal sample

NL: screening level not listed

U: analyte was not detected, result is less than the limit of detection

UJ: analyte was not detected, result is less than the limit of detection which is estimated

USEPA: United States Envronmental Protection Agency

USEPA Industrial Soil RSL

Method

Analyte

CAS Number

SFBRWQCB TIER 1 SOIL

Sacramento, CA

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs

KS-SR20-001S N KS-SR20-001S-17' 17 17

KS-SR20-001S N KS-SR20-001S-DG-3.5 3.5 4

KS-SR20-002S N KS-SR20-002S-22' 22 22

KS-SR20-002S N KS-SR20-002S-DG-3.5 3.5 4

KS-SR20-003S N KS-SR20-003S-21' 21 21

KS-SR20-003S FD KS-SR20-997S-99 21 21

KS-SR20-003S N KS-SR20-003S-DG-3.5-4 3.5 4

KS-SR20-004S N KS-SR20-004S-12' 12 12

KS-SR20-004S N KS-SR20-004S-DG-0-1 0 1

KS-SR20-005S N KS-SR20-005S-10 10 10

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5

KS-SR20-006S N KS-SR20-006S-24' 24 24

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5

KS-SR20-007S N KS-SR20-007S-29' 29 29

KS-SR20-007S N KS-SR20-007S-DG-0-1 0 1

KS-SR20-008S N KS-SR20-008S-28' 28 28

KS-SR20-008S FD KS-SR20-999S-99' 28 28

KS-SR20-008S N KS-SR20-008S-DG-4-5 4 5

KS-SR20-009S N KS-SR20-009S-29' 29 29

KS-SR20-009S N KS-SR20-009S-DG-4-5 4 5

KS-SR20-010S N KS-SR20-010S-11' 11 11

KS-SR20-010S N KS-SR20-010S-DG-4-5 4 5

KS-SR20-011S N KS-SR20-011S-26' 26 26

KS-SR20-011S N KS-SR20-011S-DG-3.5-4 3.5 4

KS-SR20-013HA N KS-SR20-013HA-3.5' 3.5 3.5

KS-SR20-013HA FD KS-SR20-998 0 4

KS-SR20-014HA N KS-SR20-014HA-DG-2.5' 2.5 2.5

KS-SR20-015HA N KS-SR20-015HA-DG-4' 4 4

KS-SR20-016HA N KS-SR20-016HA-DG-4' 4 4

KS-SR20-017HA N KS-SR20-017HA-DG-3.5' 3.5 3.5

KS-SR20-018HA N KS-SR20-018HA-DG-3' 3 3

Notes:

USEPA Industrial Soil RSL: United States Environmental Protection Agency Regional Screening Level for industrial soil (THQ=1.0), May 2020.

SFBRWQCB Tier 1 Soil: San Francisco Bay Regional Water Quality Control Board Tier 1 Environmental Screening Level for soil, 2019.

Result exceeds SFBRWQCB Tier 1 for soil

Result exceeds USEPA Industrial Soil RSL

Bold Field Duplicate Pair

+: likely biased high

-: likely biased low

CAS: Chemical Abstract System

FD: field duplicate ft bgs: feet below ground surface

J: result value is estimated µg/kg - microgram per kilogram

N: normal sample

NL: screening level not listed

U: analyte was not detected, result is less than the limit of detection

UJ: analyte was not detected, result is less than the limit of detection which is estimated

USEPA: United States Envronmental Protection Agency

USEPA Industrial Soil RSL

Method

Analyte

CAS Number

Unit

SFBRWQCB TIER 1 SOIL

USEPA 8260B

1,2,4-

Trimethylbenzene

95-63-6 µg/kg

NL

1,800,000

Result

< 2.1 U

< 1.9 U

< 63 U

< 2.0 U

< 2.0 UJ

< 1.9 U

< 2.1 U

< 2.3 U

< 1.8 U

< 2.0 U

< 1.9 U

< 2.3 U

< 2.1 U

< 2.1 U

< 1.8 U

< 1.9 U

< 2.4 U

< 2.1 U

< 2.0 U

< 2.2 U

< 1.7 U

< 2.1 U

< 2.1 U

< 2.1 U

< 1.9 U

< 1.9 U

< 1.6 U

< 2.0 U

< 2.1 U

< 2.0 UJ

< 1.7 U

Sacramento, CA

Location Sample

Type Sample ID

Start Depth, ft bgs

End Depth, ft bgs

KS-SR20-001S N KS-SR20-001S-17' 17 17

KS-SR20-001S N KS-SR20-001S-DG-3.5 3.5 4

KS-SR20-002S N KS-SR20-002S-22' 22 22

KS-SR20-002S N KS-SR20-002S-DG-3.5 3.5 4

KS-SR20-003S N KS-SR20-003S-21' 21 21

KS-SR20-003S FD KS-SR20-997S-99 21 21

KS-SR20-003S N KS-SR20-003S-DG-3.5-4 3.5 4

KS-SR20-004S N KS-SR20-004S-12' 12 12

KS-SR20-004S N KS-SR20-004S-DG-0-1 0 1

KS-SR20-005S N KS-SR20-005S-10 10 10

KS-SR20-005S N KS-SR20-005S-DG-3-3.5 3 3.5

KS-SR20-006S N KS-SR20-006S-24' 24 24

KS-SR20-006S N KS-SR20-006S-DG-4.5-5 4 4.5

KS-SR20-007S N KS-SR20-007S-29' 29 29

KS-SR20-007S N KS-SR20-007S-DG-0-1 0 1

KS-SR20-008S N KS-SR20-008S-28' 28 28

KS-SR20-008S FD KS-SR20-999S-99' 28 28

KS-SR20-008S N KS-SR20-008S-DG-4-5 4 5

KS-SR20-009S N KS-SR20-009S-29' 29 29

KS-SR20-009S N KS-SR20-009S-DG-4-5 4 5

KS…