Specification Attachments Part_1.pdf

KLEINFELDER/STANTEC ARCF 2016 SREL Contract 3

SPECIFICATIONS

Attachments

Specification Attachments

Attachment to Specification Section 01 00 00 Paragraph 1.10:

Contractor Equipment Data Sheet - CESPK FORM 450

Prepared by various entities.

CONTRACTOR EQUIPMENT DATA SHEET

(Data to be furnished by Contractor for all equipment to be used on modifications as required under the Special Provisions of the Contract.)

DATE

CONTRACTOR CONTRACT NUMBER

1. EQUIPMENT DESCRIPTION

2. MODEL AND SERIES

3. YEAR PURCHASED

4. PURCHASE PRICE AT YEAR PURCHASED

5. LIST PRICE, YEAR OF MANUFACTURE

6. YEAR MANUFACTURED

7. EQUIPMENT HORSEPOWER

8. CARRIER HORSEPOWER

9. FUEL TYPE

10. SHIPPING WEIGHT

11. TIRE SIZE: FRONT - ______________________ DRIVE - _______________________ TRAILING - _______________________

REMARKS:

CESPK FORM 450 1 SEP 92 (Edition of Apr 84 will be used) FormFlow 2.2, ver 1

Attachment to Specification Section 01 00 00 Paragraph 1.17.12:

As-Built drawings for Sump 70

Prepared by the ity of Sacramento.

As-Built Attachments

Item 01 – PLAN AND SECTION

Item 02 - DISCHARGE LINE DETAILS

Item 03 – EQUIPMENT PLAN

Item 04 – EQUIPMENT SECTION

Item 05 – EQUIPMENT DETAILS

Item 06 – STRUCTURAL PLAN AND SECTION

Item 07 - STRUCTURAL SECTION

Item 08 – EQUIPMENT DETAILS

Item 09 – GRADING, FENCE AND BUILDING DETAILS

Item 10 – STORM DRAIN “A” PLAN AND PROFILE

Item 11 – STORM DRAIN “B” PLAN AND PROFILE

Attachment to Specification Section 01 33 00 Paragraph 1.6:

ENG Form 4025-R

Attachment to Specification Section 01 45 00 Paragraph 3.10:

Sample Form of Typical Contractor’s Test Report

Attachment to Specification Section 01 50 00 Paragraph 3.5.3.1:

iWATCH Army Training for Contractors

Prepared by U.S. army.

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Attachment to Specification Section 01 57 19 Paragraph 1.6:

Draft Supplemental Environmental Assessment/ Environmental Impact Report, June 2021

DRAFT

Supplemental Environmental Impact Report/ Supplemental Environmental Assessment

American River Watershed Common Features Water Resources Development Act of 2016 Project Sacramento River East Levee Contract 3

June 2021

Central Valley Flood Protection Board 3310 El Camino Ave, Room 170 Sacramento, CA 95821

US Army Corps of Engineers Sacramento District 1325 J Street Sacramento, CA 95814

[This Page Intentionally Left Blank] i

Preface The Sacramento River East Levee (SREL) Contract 3 project includes the installation of levee improvements to meet embankment and foundation stability requirements along the SREL in the Pocket- Greenhaven neighborhood of Sacramento, California. Most of the levee improvements included in SREL Contract 3 were analyzed in the 2016 American River Watershed Common Features General Reevaluation Report (ARCF GRR) Environmental Impact Statement/Environmental Impact Report (EIS/EIR). This document is arranged as a Supplemental EIR (Part 1) and a Supplemental Environmental Assessment (SEA) (Part 2) to supplement the ARCF GRR Final EIS/EIR by addressing the environmental impacts from project modifications and design details developed after the ARCF GRR Final EIS/EIR was prepared. The Supplemental EIR is being prepared by the Central Valley Flood Protection Board (CVFPB) as the State lead agency under the California Environmental Quality Act (CEQA), and the Supplemental EA is being prepared by the U.S. Army Corps of Engineers (USACE) as the lead agency under the National Environmental Policy Act (NEPA).

As described in more detail below, CEQA and NEPA requirements differ, including which project elements require additional environmental analyses and the definition of baselines used to evaluate impacts. For these reasons, the Supplemental EIR (Part 1) and Supplemental EA (Part 2) for SREL Contract 3 are independent analyses but combined in this document for clarity and completeness.

In accordance with CEQA requirements, Part 1 of this document (the Supplemental EIR) analyzes the proposed project, which includes SREL Contract 3 project components at a greater level of design detail than was available in the ARCF GRR Final EIS/EIR, to support both CEQA lead and responsible agency decision-making. The impacts of the proposed project are compared to existing conditions (as of April 2021) to determine impact significance in this Supplemental EIR.

In accordance with NEPA, Part 2 of this document (the Supplemental EA) analyzed the Proposed Action including only those elements of the SREL Contract 3 project which were not previously analyzed in the ARCF GRR Final EIS/EIR and Supplemental EA/EIR documents already prepared for the SREL Contract 1 and Contract 2 projects. Because these prior documents addressed the installation of cutoff walls, staging areas, haul routes, borrow sites, and potential spoils disposal areas, these project elements are already authorized for construction, have been considered for their full environmental impacts, and are considered to be part of the NEPA No Action Alternative. The impacts of the Proposed Action are compared to the No Action Alternative to determine impact significance in this Supplemental EA. For NEPA purposes, the Proposed Action includes changes to the project that have not previously been analyzed and authorized: (1) utility improvements at Sump 70, including replacing pipes that run through the existing levee, (2) year-round closure of public parks identified as staging areas, (3) one additional levee access point and haul route, (4) five additional staging areas, and (6) a soil stabilization cap.

CVFPB will release the Draft Supplemental EIR for public and agency review in accordance with CEQA requirements. USACE will release the Draft Supplemental EA for public and agency review concurrently with the Draft Supplemental EIR. After the review period closes, CVFPB and USACE will consider the comments received and prepare responses. These comments and responses, along with any modifications, will be incorporated into a Final Supplemental EIR and a Final Supplemental EA with a Finding of No Significant Impact to meet NEPA requirements for the SREL Contract 3 project.

Environmental commitments and mitigation measures summarized in the Executive Summary (Table ES-1) apply to the SREL Contract 3 Project as a whole.

ii

Part 1.

Draft Supplemental Environmental Impact Report American River Watershed Common Features Water Resources Development Act of 2016 Project Sacramento River East Levee Contract 3 Prepared for:

Central Valley Flood Protection Board 3310 El Camino Ave, Room 179 Sacramento, CA 95821 Contact:

Kalia Schuster

(916) 574-1441

Prepared by:

GEI Consultants, Inc.

2868 Prospect Park Drive, Suite 400 Sacramento, CA 95670 Contact:

Drew Sutton Senior Project Manager

(916) 631-4532

June 18, 2021 iii

TABLE OF CONTENTS

Chapter 1. Introduction

Proposed Project Project Location Background and Need for Action Project Purpose, Need, and Objectives Purpose of the Supplemental Environmental Impact Report Public Review of Supplemental EIR Related Documents Decisions Needed

Chapter 2. Proposed Project Refinements Proposed Types of Levee Improvements

Cutoff Walls Municipal Drainage System Improvements Haul Routes, Proposed Borrow Site, and Disposal Site Potential Staging Areas Utility Relocations and Removals Construction Operations and Maintenance

Chapter 3. Environmental Setting, Impacts, and Mitigation Measures Introduction

Approach to Analysis Resource Topics Not Discussed in Detail

Visual Resources Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Air Quality Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Vegetation and Wildlife Environmental and Regulatory Setting Environmental Impacts Mitigation Measures iv

Special-Status Species Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Climate Change Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Cultural and Tribal Cultural Resources

3.7.1 Environmental and Regulatory Setting

3.7.2 Environmental Impacts

Mitigation Measures Geological Resources

Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Hazardous Wastes and Materials Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Water Quality and Groundwater Resources Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Noise Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Recreation Environmental and Regulatory Setting Environmental Impacts

3.12.3 Mitigation Measures

Transportation and Circulation

Environmental and Regulatory Setting Environmental Impacts Mitigation Measures v

Public Utilities and Service Systems Environmental and Regulatory Setting Environmental Impacts Mitigation Measures

Chapter 4. Cumulative and Growth-Inducing Effects Cumulative Projects

Projects Contributing to Potential Cumulative Effects Cumulative Effects

Visual Resources Air Quality Vegetation and Wildlife Special-Status Species Climate Change Cultural Resources Geological Resources Hazardous Wastes and Materials Water Quality and Groundwater Resources Noise Recreation Transportation and Circulation Public Utilities and Service Systems

Growth-inducing Effects Irreversible and Irretrievable Commitment of Resources

Chapter 5. Report Preparers and Reviewers Chapter 6. References

List of Figures Figure 1-1. Project Vicinity and Overview of Proposed Improvements Figure 2-1. Project Site with Potential Staging Areas and Haul Routes (Map 1 of 4) Figure 2-2. Project Site with Potential Staging Areas and Haul Routes (Map 2 of 4) Figure 2-3. Project Site with Potential Staging Areas and Haul Routes (Map 3 of 4) Figure 2-4. Project Site with Potential Staging Areas and Haul Routes (Map 4 of 4) Figure 2-5. Proposed Improvements (Map 1 of 3) Figure 2-6. Proposed Improvements (Map 2 of 3) Figure 2-7. Proposed Improvements (Map 3 of 3) vi

Figure 2-8. Typical Conventional Slurry Wall

List of Tables Table 2-1. Levee Improvements Summary

Table 2-2. Preliminary Estimated Borrow Material and Excess Soil Disposal Requirements

Table 2-3. Summary of Utility Modifications and Removals

Table 2-4. Typical Construction Equipment that May Be Used

Table 3-1. Sacramento Valley Air Basin Attainment Status

Table 3-2. Sacramento Metropolitan Air Quality Management District Thresholds of Significance for Construction

Table 3-3. General Conformity de minimis Thresholds

Table 3-4. Emissions Estimates for the Proposed Project

Table 3-5. Emissions Estimates for the ARCF 2016 Project

Table 3-6. Existing Habitat Types on the Project Site

Table 3-7. Section 303(d)-Listed Pollutants in the Project Area

Table 3-8. Parks and Recreational Facilities in or Near the Project Site (Public and Private)

List of Appendices Appendix A: Air Quality Modeling Results

Appendix B: Biological Resources Data Appendix B-1: Land Cover Maps and Sensitive Biological Resources Appendix B-2: Species Lists Appendix B-3: Special-Status Species Occurrence Tables vii

Abbreviations and Acronyms

AB Assembly Bill APE Area of Potential Effects ARCF GRR American River Watershed Common Features General Reevaluation

Report BACT Best Available Control Technology Basin Plan Sacramento River Basin and the San Joaquin River Basin BMPs Best Management Practices BSLMS Beach/Stone Lakes Mitigation Site BSSCP Bentonite Slurry Spill Contingency Plan BWFS Basin-Wide Feasibility Studies CAA Clean Air Act CARB California Air Resources Board CAS Climate Adaptation Strategy CAL FIRE California Department of Forestry and Fire Protection Caltrans California Department of Transportation CB cement-bentonite CCR California Code of Regulations CDFW California Department of Fish and Wildlife CEQ Council on Environmental Quality CEQA California Environmental Quality Act CESA California Endangered Species Act CFR Code of Federal Regulations City City of Sacramento CO carbon monoxide CO2 carbon dioxide CO2e carbon dioxide equivalent County County of Sacramento CRHR California Register of Historical Resources CSUS California State University, Sacramento CVFMP Central Valley Flood Management Planning CVFPB Central Valley Flood Protection Board CVFPP Central Valley Flood Protection Plan CWA Clean Water Act cy cubic yards dB decibels dBA A-weighted decibels viii

DEIS/DEIR Draft Environmental Impact Statement/Draft Environmental Impact Report Delta Sacramento-San Joaquin Delta DMM deep soil mixing DWR California Department of Water Resources EA/EIR Environmental Assessment/Environmental Impact Report EFH Essential Fish Habitat EIP early implementation project EIS/EIR Environmental Impact Statement/Environmental Impact Report EM Engineering Manual EO Executive Order EPA U.S. Environmental Protection Agency ER Engineering Regulation ESA Endangered Species Act ESUs evolutionarily significant units ETL Engineering Technical Letter Farmland Prime Farmland, Unique Farmland, or Farmland of Statewide Importance FCR fire-cracked rock FEIS/FEIR Final Environmental Impact Statement/Final Environmental Impact Report FEMA Federal Emergency Management Agency FONSI Finding of No Significant Impact FPPA Farmland Protection Policy Act FTA Federal Transit Administration FWARG Far Western Anthropological Research Group GEI GEI Consultants, Inc.

GHG Greenhouse gas HPTP Historic Properties Treatment Plan I-5 Interstate 5 IDM investigation-derived material ITE Institute of Transportation Engineers Leq equivalent sound level Leq[h] 1-hour equivalent sound level LOS level of service MIAD Mormon Island Auxiliary Dam MBTA Migratory Bird Treaty Act MLD Most Likely Descendant MRZ Mineral Resource Zone NAAQS National Ambient Air Quality Standards NCIC North Central Information Center NEMDC Natomas East Main Drainage Canal NEPA National Environmental Policy Act ix

NFIP National Flood Insurance Program NHPA National Historic Preservation Act NMFS National Marine Fisheries Service NO2 nitrogen dioxide NOX oxides of nitrogen NPDES National Pollutant Discharge Elimination System NRHP National Register of Historic Places O&M operations and maintenance OHWM ordinary high water mark OPT one pass trench PA Programmatic Agreement PAR PAR Environmental Services PCE passenger car equivalent PG&E Pacific Gas and Electric Company Phase I ESA Phase I Environmental Site Assessment PM particulate matter PM10 particulate matter equal to or less than 10 micrometers in diameter PM2.5 particulate matter equal to or less than 2.5 micrometers in diameter PPV peak particle velocity Reclamation U.S. Bureau of Reclamation RM River Mile RPA Registered Professional Archaeologist RWQCB Regional Water Quality Control Board SAFCA Sacramento Area Flood Control Agency SB soil-bentonite SCB soil-cement-bentonite SHPO State Historic Preservation Officer SMAQMD Sacramento Metropolitan Air Quality Management District SO2 sulfur dioxide SPCCP Spill Prevention Control and Countermeasures Plan SPRR Southern Pacific Railroad Company SR State Route SRA shaded riverine aquatic SRBPP Sacramento River Bank Protection Project SRCSD Sacramento Regional County Sanitation District SREL Sacramento River East Levee SRFCP Sacramento River Flood Control Project SSHCP South Sacramento Habitat Conservation Plan SVAB Sacramento Valley Air Basin SWPPP Stormwater Pollution Prevention Plan x

SWRCB State Water Resources Control Board TACs toxic air contaminants UAIC United Auburn Indian Community of the Auburn Rancheria UCB University of California, Berkeley USACE U.S. Army Corps of Engineers USFWS U.S. Fish and Wildlife Service VdB vibration decibels VMT vehicle miles traveled WCM Water Control Manual WRDA Water Resources Development Act WSAFCA West Sacramento Area Flood Control Agency WSLIP West Sacramento Levee Improvements Program xi

EXECUTIVE SUMMARY

The Central Valley Flood Protection Board (CVFPB), as lead agency under the California Environmental Quality Act (CEQA), has prepared this Supplemental Environmental Impact Report (SEIR) to evaluate portions of the Sacramento River East Levee (SREL) Contract 3 (proposed project) that require additional environmental analysis since the American River Watershed Common Features General Reevaluation Report (ARCF GRR) Environmental Impact Statement/Environmental Impact Report (EIS/EIR) was certified in 2016. These elements of the proposed project (staging areas, haul routes, borrow site, spoils disposal, municipal drainage infrastructure modifications, and specific seepage and stability improvements and locations) require supplemental analysis under CEQA because further project design details and refinements by USACE since the ARCF GRR Final EIS/EIR have resulted in necessary project refinements to these project elements (the “proposed project”).

State CEQA Guidelines Section 15163(a)(2) (Cal. Code Regs., tit. 14, § 15163, subd. (a)(2)) requires a Supplemental EIR when “minor additions or changes would be necessary to make the previous EIR adequately apply to the project in the changed situation.” This Supplemental EIR has been prepared to supplement, not replace, the ARCF GRR Final EIS/EIR, and provides only the information necessary to make the previous ARCF GRR Final EIS/EIR adequate for the proposed project (SREL Contract 3) as revised. Consequently, public scoping and alternatives analyses are not contained herein as they have already been sufficiently conducted during development of the ARCF GRR Final EIS/EIR. This Supplemental EIR compares the effects of the proposed project to existing conditions as of April 2021.

Areas of Controversy and Issues to be Resolved

The ARCF GRR Final EIS/EIR identified several areas of controversy based on the comments received during the public scoping period in 2008 and the history of the NEPA and CEQA processes undertaken by USACE, CVFPB, and the Sacramento Area Flood Control Agency since initial scoping for the ARCF GRR EIS/EIR. Several of these areas of controversy are applicable to the proposed project, including:

Construction-related effects on residents and businesses adjacent to the project levees.

Construction-related impacts on biological resources.

Vegetation and tree removal.

Effects to cultural resources and resources significant to Native American tribes.

Impacts to recreational facilities.

Impacts to endangered species and their habitats.

There are no issues to be resolved. The ARCF GRR Final EIS/EIR selected the alternative to be implemented, and identified feasible mitigation for significant impacts.

Public Review of Supplemental EIR

This Draft Supplemental EIR is being made available to responsible and other potentially interested agencies, stakeholder organizations, and individuals, including all entities that have previously requested such notice in writing, for a 45-day review period from June 18, 2021 to August 1, 2021. USACE, DWR, and CVFPB will conduct a virtual public meeting on July 14, 2021 to receive xii comments on the Draft Supplemental EIR. Details and login instructions for this public meeting may be found on the project website at http://cvfpb.ca.gov/public-notices/.

A Notice of Completion for this Draft Supplemental EIR has been filed with the State Clearinghouse, in accordance with the State CEQA Guidelines (Section 15085), and a Notice of Availability of this Draft Supplemental EIR has been posted in accordance with State CEQA Guidelines (Section 15087). A public notice was posted in the Sacramento Bee on June 18, 2021, and sent to individuals requesting information regarding the proposed project. All references used in the preparation of this SEIR, including the 2016 ARCF GRR Final EIS/EIR, have also been made available to the public. This distribution and public noticing ensures that all interested parties have an opportunity to provide written comments on the Draft Supplemental EIR consistent with State CEQA Guidelines. (14 Cal. Code Regs., tit. 14, § 15000 et seq.) CVFPB is only accepting comments on the Draft Supplemental EIR and not on the ARCF GRR Final EIS EIR, which was certified in 2016. All proposed changes, additions, and deletions to the ARCF GRR Final EIS/EIR are included within this Supplemental EIR.

Copies of this Draft Supplemental EIR are available for review online at www.sacleveeupgrades.com.

Written comments on the Draft Supplemental EIR must be directed to the name and address below via postal mail or email by no later than 5:00 p.m. on August 1, 2021:

Kalia Schuster Flood Projects Office Department of Water Resources 3464 El Camino Avenue Room 200 Sacramento, CA 95821 PublicCommentARCF16@water.ca.gov

If comments are provided by email, please indicate “SREL Contract 3 Supplemental EIR” in the subject line, attach comments in MS Word format, and include the commenter’s name and mailing address. For comments by agencies and organizations, please include the name of a contact person for the agency or organization. All comments received, including names and addresses of commenters, will become part of the official administrative record and may be available to the public.

Summary of Environmental Impacts

Table ES-1 summarizes the environmental effects analysis, provided in detail in Sections 3.2 through 3.14 of this Supplemental EIR, and includes effects titles, significance conclusions before and after mitigation implementation, and mitigation measures. The supplemental effects of the proposed project were updated and compared to existing conditions as of April 2021. All of the significant environmental effects (“significant impacts”) presented in Table ES-1 were previously presented as such in the ARCF GRR Final EIS/EIR, and there is no substantial increase in the severity of any significant environmental effect previously presented in the ARCF GRR Final EIS/EIR.

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C on su lta nt s, In c.

CHAPTER 1. INTRODUCTION

Proposed Project The U.S. Army Corps of Engineers, Sacramento District (USACE), Central Valley Flood

Protection Board (CVFPB), and Sacramento Area Flood Control Agency (SAFCA) propose to construct, as a part of the American River Watershed Common Features (ARCF) 2016 Project, levee improvements consisting of an approximately 10,580 cumulative feet (2 miles) of cut off wall along the Sacramento River’s east levee in Sacramento, California. Construction is planned to start in April 2022 and conclude in October 2022. The proposed project is the third of four contracts on the Sacramento River being constructed from 2020 to 2024 to address seepage, stability, and overtopping concerns along the Sacramento River east levee. USACE is the Federal lead agency under the National Environmental Policy Act (NEPA), CVFPB is the State lead agency under the California Environmental Quality Act (CEQA), and SAFCA is a responsible agency under CEQA.

Project Location The project is located in the City of Sacramento (City), California, along the east bank of the

Sacramento River (Figure 1-1). The proposed project includes cutoff wall installation work in the Pocket- Greenhaven neighborhood. The project site includes the levee prism, where the cutoff wall installation will occur and material will be hauled, and several parking areas, parks, and vacant lots used for staging areas.

Background and Need for Action Following the 1986 flood, and the associated severe impacts to the city of Sacramento’s levee system, Congress directed USACE to investigate additional means to reduce flood risk to Sacramento.

USACE completed this investigation in 1991, recommending construction of Auburn Dam and levee improvements downstream of Folsom Dam (USACE 1991). Congress then directed USACE to conduct supplemental analysis of the flood management options considered in the 1991 study. The resulting Supplemental Information Report, American River Watershed Project, California recommended a similar alternative, with Auburn Dam and downstream levee work (USACE 1996). It considered, but did not advance, additional alternatives for Folsom Dam improvements and a stepped flood release plan for Folsom Dam. All three alternatives were accompanied by downstream levee improvements.

Congress recognized that levee improvements were “common” to all candidate plans in the report and that there was a Federal interest in participating in these “common features.” Thus, the ARCF Project was authorized in the Water Resources Development Act (WRDA) of 1996, Pub. L. No. 104‐303, § 101(a)(1), 110 Stat. 3658, 3662‐3663 (1996) (WRDA 1996), and the decision about constructing Auburn Dam was deferred. Major construction components for the ARCF Project in the WRDA 1996 authorization included seepage remediation along approximately 22 miles of American River levees, and strengthening and raising 12 miles of the Sacramento River levee in the Natomas Basin.

Figure 1-1. Project Vicinity and Overview of Proposed Improvements

The ARCF Project was modified by the Water Resources Development Act of 1999, Pub. L. No.

106‐53, § 366, 113 Stat. 269, 319‐320 (1999) (WRDA 1999), to include additional levee improvements to safely convey an emergency release of 160,000 cubic feet per second (cfs) from Folsom Dam. These improvements included seepage remediation and levee raises along four reaches of the American River, and constructing levee strengthening features and raising 5.5 miles of the Natomas Cross Canal levee in Natomas. Additional construction components for both WRDA 1996 and WRDA 1999 were authorized and have been constructed by USACE. However, the Natomas Basin features authorized in WRDA 1996 and WRDA 1999 were deferred and later reassessed in the Natomas Post Authorization Change Report (PACR) (USACE 2020). The Natomas PACR was authorized in the Water Resources Reform and Development Act of 2014, Pub. L. No. 113‐121, § 7002, 128 Stat. 1193, 1366 (2014), and the associated levee improvements, referred to as the ARCF, Natomas Basin Project, are currently under construction.

Additionally, following the flood of 1986, significant seepage occurred on the Sacramento River levees from Verona (upstream end of Natomas) at river mile (RM) 79 to Freeport at RM 45.5 and on both the north and south banks of the American River levees. Seepage on the Sacramento River was so extensive that soon after the 1986 flood event, Congress funded levee improvements as part of the Sacramento River System Evaluation, Phase I, Sacramento Urban Area (Sac Urban Project). The Sac Urban Project constructed shallow seepage cutoff walls from Powerline Road in Natomas at approximately RM 64 downstream to Freeport. At the time, seepage through the levees was considered to be the only significant seepage problem affecting the levees in the Sacramento area.

After construction of the Sac Urban Project, the Sacramento Valley experienced another flood event in 1997. The seepage from this event led to a geotechnical evaluation of levees in the vicinity of the city of Sacramento, which showed that deep underseepage was of concern. Considerable seepage occurred on the Sacramento River as well as on the American River. Seepage on the American River was expected because levee improvements had yet to be constructed. However, the significant seepage on the Sacramento River in reaches where levees had been improved as part of the Sac Urban Project exposed that deep underseepage was a significant concern in this area, a conclusion later confirmed by the Levee Seepage Task Force in 2003.

While the reevaluation study was beginning for the ARCF Project, the Folsom Dam PACR was being completed by USACE. The results of the PACR, and of the follow‐on Economic Reevaluation Report for Folsom Dam improvements, showed that additional levee improvements were needed on the American River and on the Sacramento River below their confluence to capture the benefits of the Folsom Dam projects. The levee problems identified in these reports consisted primarily of the potential for erosion on the American River and seepage, stability, erosion, and height concerns on the Sacramento River below its confluence with the American River. These findings pointed to a need for additional reevaluation in the two remaining basins comprising the city of Sacramento: American River North and American River South. The ARCF GRR Final EIS/EIR was completed in December 2015, and the Record of Decision (ROD) was signed in August 2016. Congress authorized the reevaluated ARCF Project in the WRDA of 2016.

USACE’s non-Federal partner, SAFCA, reviewed, investigated, and conducted analyses to determine the scope of the required improvements on the Sacramento River to meet Federal Emergency Management Agency (FEMA) and State urban levee design criteria (ULDC) standards as a potential early implementation action under its Levee Accreditation Program prior to the authorization of the ARCF GRR.

Under this evaluation, SAFCA initiated design on the seepage and stability improvements to the

Sacramento River east levee. However, since receiving authorization and appropriations from Congress in 2016, USACE is moving forward as the lead implementation agency for these improvements.

In July 2018, Congress granted USACE construction funding to complete urgent flood control projects under the Bipartisan Budget Act of 2018. ARCF 2016 was identified for urgent implementation, and Congress supplied full funding to allow USACE to implement the much-needed levee improvements as quickly as possible. Although most environmental effects were addressed in the ARCF GRR EIS/EIR, impacts associated with some of the work, such as specific staging areas, haul routes, borrow sites, and spoils disposal, were identified as a part of SAFCA’s later assessment, and therefore were not assessed in the ARCF GRR EIS/EIR. Supplemental NEPA and CEQA analyses is necessary for any actions or effects that were not previously addressed in the ARCF GRR EIS/EIR as discussed next.

The proposed project is one of four contracts planned to address seepage, stability, and overtopping concerns along the SREL that will take place over subsequent years. Improvements were originally developed prior to ARCF authorization. When ARCF received full funding, the design package was transferred to USACE and a panel of subject matter experts reviewed the design for compliance with USACE requirements and meeting the intent of the authorization. The first package, Sacramento River East Levee (SREL) Contract 1, is the portion of the design that was in full compliance. The second package, SREL Contract 2, is the portion of the design that needed minor improvements and additional data collection to support recommendation. Additional actions or effects from SREL Contracts 1 and 2 were addressed separately in two Supplemental EAs/Supplemental EIRs (USACE and CVFPB 2019;

USACE and CVFPB 2020). SREL Contract 3, the subject of this Supplemental EIR, includes the designs that were determined to need additional design resolution, revision, or data gathering. SREL Contract 4 includes the levee raises that were authorized, but these were not included in the non-Federal sponsor’s design and do not have sufficient detail to determine whether supplemental NEPA and CEQA compliance documents are necessary.

Project Purpose, Need, and Objectives The purpose of the SREL Contract 3 Project is to reduce the flood risk associated with through-seepage and under-seepage of water from the Sacramento River into the city of Sacramento’s Pocket- Greenhaven neighborhood. The Sacramento metropolitan area is one of the most at-risk areas for flooding in the United States. There is a high probability that flood flows in the Sacramento River will stress the network of levees protecting central and southern Sacramento to the point that levees could fail. The consequences of such a levee failure would be severe in the Pocket-Greenhaven neighborhood since the inundated area is highly urbanized and the flooding could be up to 20 feet deep.

USACE has determined that the levee system along the Sacramento River east levee does not meet the current Federal standards for flood protection due to seepage, slope stability, and erosion. Seepage is occurring beneath and through segments of the levee system, creating a significant risk to the stability and reliability of the levee system throughout the Sacramento area. Stream bank erosion issues in the project area are exacerbated by the lack of floodplain adjacent to the river.

The proposed project is needed to reduce risks of levee failure, especially related to seepage and underseepage, and levee stability. While the crown of the Sacramento River east levee along the reaches identified in Figure 1-1 accommodates a maintenance roadway and/or a paved bike trail, the slope is steep, typically measuring a ratio of 1.8 Horizontal:1 Vertical (1.8H:1V) on the landside and 1.6H:1V on the waterside. This steepness, particularly in the case of a levee constructed with unsuitable materials over a porous foundation, significantly increases the risk of instability. Through-seepage also increases levee instability. Constructing cutoff walls will fill this gap and strengthen the levee in the project area.