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  • HOLDREGE & KULL, AN NV5 COMPANY 792 SEARLS AVENUE NEVADA CITY, CALIFORNIA 95959 PROJECT NO. 4688.01

    FINAL SEDIMENT CHARACTERIZATION REPORT FOR

    COMBIE RESERVOIR SEDIMENT AND MERCURY REMOVAL PROJECT MEADOW VISTA, CALIFORNIA

    JANUARY 25, 2018

    NEVADA IRRIGATION DISTRICT ENGINEERING DEPARTMENT 1036 WEST MAIN STREET GRASS VALLEY, CALIFORNIA 95945

    PREPARED FOR:

  • 792 Searls Avenue | Nevada City, CA 95959 | www.NV5.com | Office 530.478.1305 | Fax 530.478.1019 CONSTRUCTION QUALITY ASSURANCE - INFRASTRUCTURE - ENERGY - PROGRAM MANAGEMENT - ENVIRONMENTAL

    Project No. 4688.01 January 25, 2018 Nevada Irrigation District 1036 West Main Street Grass Valley, CA 95945 Attention: Greg Jones, Assistant General Manager Reference: Combie Reservoir Sediment and Mercury Removal Project Meadow Vista, California

    Subject: Final Sediment Characterization Report

    Dear Mr. Jones:

    On behalf of the Nevada Irrigation District (NID), Holdrege & Kull (H&K/NV5) prepared this report to summarize site investigation procedures and to present the results of sediment characterization associated with the Combie Reservoir Sediment and Mercury Removal Project in Meadow Vista, California.

    This report provides information regarding chemical and physical properties of sediment in a 45-acre area to be dredged, which is located in the northeastern portion of the reservoir near the inlet of the Bear River. The site investigation was performed in general accordance with H&K’s proposal dated September 15, 2016, amended September 27, 2017.

    H&K appreciates the opportunity to provide environmental engineering services for the Combie Reservoir Sediment and Mercury Removal Project. Please contact the undersigned with any questions or comments regarding H&K’s investigation.

    Sincerely,

    HOLDREGE & KULL, AN NV5 COMPANY

    Bryan Botsford Jason W. Muir, C.E. 60167 Staff Geologist Principal Engineer

    F:\1 Projects\4688 NID Combie Reservoir\4688.01 Sediment Characterization Report\02 Final Sediment Characterization Report, 2018 Amendment\01 Text\4688.01 Final Sediment Characterization Report, Combie Reservoir.docx

  • Project No. 4688.01 Final Sediment Characterization Report January 25, 2018 Combie Reservoir Sediment and Mercury Removal Project

    Holdrege & Kull, An Company | iii

    TABLE OF CONTENTS

    TABLE OF CONTENTS .......................................................................................... iii ATTACHMENTS ...................................................................................................... v ABBREVIATIONS AND ACRONYMS .................................................................... vi 1 INTRODUCTION ................................................................................................ 1

    1.1 PURPOSE ................................................................................................. 1 1.2 SITE DESCRIPTION ................................................................................. 1 1.3 LIMITATIONS AND EXCEPTIONS ........................................................... 2

    2 INVESTIGATION METHODOLOGY ................................................................... 3 2.1 SUBSURFACE INVESTIGATION ............................................................. 3

    2.1.1 Direct Push Drilling ........................................................................ 3 2.1.2 Exploratory Trenching and Bulk Sampling ..................................... 5

    2.2 SAMPLE HANDLING ................................................................................ 6 2.3 DECONTAMINATION ............................................................................... 6 2.4 HEALTH AND SAFETY ............................................................................. 6 2.5 SURVEYING ............................................................................................. 7 2.6 LABORATORY ANALYSIS ....................................................................... 8

    2.6.1 Inorganics Analysis ........................................................................ 9 2.6.2 Organics Analysis ........................................................................ 10

    2.6.3 Physical Properties .................................................................................. 10 3 DATA QUALITY OBJECTIVES ........................................................................ 11

    3.1 BACKGROUND ....................................................................................... 11 3.2 REGULATORY FRAMEWORK ............................................................... 11

    3.2.1 Water Quality ............................................................................... 12 3.2.2 Human Health ............................................................................. 14

    3.3 RATIONALE FOR SAMPLING STRATEGY ............................................ 15 3.4 MEASUREMENT QUALITY OBJECTIVES ............................................. 15

    3.4.1 Laboratory Measurement Quality Objectives ............................... 15 3.4.2 Field Measurement Quality Objectives ........................................ 16

    3.5 DATA REVIEW AND VALIDATION ......................................................... 16 3.5.1 Precision ...................................................................................... 16 3.5.2 Accuracy ...................................................................................... 17 3.5.3 Representativeness ..................................................................... 18 3.5.4 Comparability .............................................................................. 18 3.5.5 Completeness ............................................................................. 18 3.5.6 Sensitivity .................................................................................... 19

  • Project No. 4688.01 Final Sediment Characterization Report January 25, 2018 Combie Reservoir Sediment and Mercury Removal Project

    Holdrege & Kull, An Company | iv

    4 INVESTIGATION RESULTS ............................................................................ 20 4.1 SURFACE CONDITIONS ........................................................................ 20 4.2 SUBSURFACE CONDITIONS ................................................................. 20 4.3 SURFACE WATER AND GROUNDWATER CONDITIONS .................... 20 4.4 LABORATORY RESULTS ...................................................................... 21

    4.4.1 Inorganics Analysis ...................................................................... 21 4.4.2 Organics Analysis ........................................................................ 21 4.4.3 Physical Properties ...................................................................... 22

    4.5 SEDIMENT DEPTH AND CROSS SECTIONS ....................................... 22 5 FINDINGS AND CONCLUSIONS ..................................................................... 23

    5.1 CHEMICAL CHARACTERIZATION ......................................................... 23 5.2 PARTICLE SIZE ANALYSIS ................................................................... 23

    6 REFERENCES ................................................................................................. 24

  • Project No. 4688.01 Final Sediment Characterization Report January 25, 2018 Combie Reservoir Sediment and Mercury Removal Project

    Holdrege & Kull, An Company | v

    ATTACHMENTS

    FIGURES Figure 1 Location Map Figure 2 Vicinity Map Figure 3 Boring and Trench Locations Figure 4 Cross Sections Figure 5 Cross Sections Figure 6 Cross Sections TABLES Table 1 Boring Locations, Elevations, and Depths Table 2 Total Metals in Sediment Samples Table 3 Methylmercury in Sediment Samples Table 4 Summary of Particle Size Analysis, Full Sediment Column Table 5 Summary of Particle Size Analysis, Shallow Sediment APPENDICES Appendix A Analytical Laboratory Reports and Chain-of-Custody Documentation Appendix B Lithologic Logs Appendix C Geotechnical Laboratory Reports

  • Project No. 4688.01 Final Sediment Characterization Report January 25, 2018 Combie Reservoir Sediment and Mercury Removal Project

    Holdrege & Kull, An Company | vi

    ABBREVIATIONS AND ACRONYMS

    APN assessor’s parcel number ATL Advanced Technology Laboratories, Inc. bgs below ground surface CAM California Assessment Manual CalEPA California Environmental Protection Agency Caltest Laboratory, Inc. CCR California Code of Regulations CDFW California Department of Fish and Wildlife CEQA California Environmental Quality Act CFGC California Fish and Game Code CFR Code of Federal Regulations COPC constituent of potential concern CrVI hexavalent chromium CTR California Toxics Rule CVAA cold-vapor atomic absorption CVAFS cold vapor atomic fluorescence spectrometry CWA Clean Water Act CWC California Water Code DI deionized water DQI data quality indicators DQO data quality objective DTSC California Department of Toxic Substances Control DTSC-SL DTSC Screening Level ELAP Environmental Laboratory Accreditation Program EPA United States Environmental Protection Agency GIS geographic information system GPS global positioning system HSC California Health and Safety Code H&K Holdrege & Kull HCl hydrochloric acid ICP-AES inductively coupled plasma atomic emission sp

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