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Home My WebLink AboutDSHW-2024-005691FINAL Groundwater Management Plan Revision 3 Tooele Army Depot – South Tooele County, Utah April 2024 Environmental Remediation Tooele Army Depot, Utah and Defense Depot Ogden, Utah Contract No. W9124J-21-D-0006 U.S. Army Environmental Command Tooele Army Depot FINAL Groundwater Management Plan Revision 3 Tooele Army Depot – South Tooele County, Utah April 2024 Environmental Remediation Tooele Army Depot, Utah and Defense Depot Ogden, Utah Contract No. W9124J-21-D-0006 Prepared For: U.S. Army Mission and Installation Contracting Command Fort Sam Houston (MICC – FSH), U.S. Army Environmental Command (USAEC), and Tooele Army Depot (TEAD) Prepared By: Brice Engineering, LLC 362 Pierpont Avenue Salt Lake City, Utah 84101 801-948-9319 PH www.BriceEng.com This page intentionally blank Groundwater Management Plan Revision 3 i Tooele Army Depot, Utah and Defense Depot Ogden, Utah TABLE OF CONTENTS ACRONYMS AND ABBREVIATIONS ...................................................................................................... III 1.0 INTRODUCTION .................................................................................................................... 1-1 1.1 Facility Background .......................................................................................................... 1-1 1.2 Project Authorization ....................................................................................................... 1-1 1.3 Purpose, Scope, and Objectives ....................................................................................... 1-1 1.4 Regulatory Framework .................................................................................................... 1-2 1.4.1 Groundwater Protection Standards (Non-Degradation Policy) .......................... 1-2 1.4.2 Potential Drinking Water Well and Surface Water Receptors ............................ 1-3 1.4.3 Alternative Method of Compliance with UAC R315-101 and R315-264............. 1-3 1.4.4 Utah Groundwater Quality Classification ........................................................... 1-3 2.0 BASEWIDE GROUNDWATER SYSTEM UPDATE ....................................................................... 2-1 3.0 BASEWIDE GROUNDWATER MANAGEMENT APPROACH ....................................................... 3-1 3.1 GMP Decision Framework and Guidelines for Adding Sites ............................................ 3-1 3.1.1 Timeline and Decision Framework for the GMP ................................................. 3-1 3.1.2 Long-Term Performance Monitoring Decision Criteria ...................................... 3-2 3.1.3 Guidelines for Adding Additional Sites to the GMP ............................................ 3-2 3.2 Groundwater Monitoring Network Integrity ................................................................... 3-2 3.3 Monitoring Well Network Adequacy ............................................................................... 3-3 3.4 Groundwater Analytical Result Repository ...................................................................... 3-4 3.5 Investigative-Derived Waste Management ..................................................................... 3-4 4.0 SITE-SPECIFIC GROUNDWATER MANAGEMENT PLANS .......................................................... 4-1 4.1 SWMUs in Long-Term Monitoring ................................................................................... 4-1 4.1.1 SWMUs 1 and 25 ................................................................................................. 4-1 4.1.2 SWMU 13 ............................................................................................................ 4-6 4.1.3 SWMU 26 ............................................................................................................ 4-8 4.2 SWMUs/AOCs in Characterization or Corrective Action ................................................. 4-8 4.2.1 AOC 5 Open Storage Yard ................................................................................... 4-9 4.2.2 AOC 27 Classification Yard Burial ........................................................................ 4-9 4.2.3 SWMUs 21/22 ..................................................................................................... 4-9 4.2.4 SWMUs and AOCs Removed from Long-Term Monitoring Program ................ 4-10 4.2.5 SWMUs and AOCs with No Long-Term Monitoring Requirements .................. 4-13 5.0 GROUNDWATER SAMPLING AND WELL INSTALLATION METHODOLOGY ............................... 5-1 5.1 Groundwater Sampling Field Procedures ........................................................................ 5-1 5.1.1 Low-Flow Groundwater Sampling ...................................................................... 5-1 5.1.2 HydraSleeve Groundwater Sampling .................................................................. 5-2 5.2 Quality Control Plan ......................................................................................................... 5-3 5.3 Laboratory Analytical Methods ....................................................................................... 5-3 5.4 Drilling Methods and Monitoring Well Installation ......................................................... 5-3 5.4.1 Drilling Methods and Selection Criteria .............................................................. 5-3 5.4.2 Monitoring Well Installation and Construction .................................................. 5-4 5.5 Well Abandonment .......................................................................................................... 5-5 TABLE OF CONTENTS (CONTINUED) Groundwater Management Plan Revision 3 ii Tooele Army Depot, Utah and Defense Depot Ogden, Utah 6.0 REFERENCES ......................................................................................................................... 6-1 TABLES Table 4-1 SWMU 1 Long-Term Monitoring Program Table 4-2 SWMU 1 Well Data Table 4-3 SWMU 25 Long-Term Monitoring Program Table 4-4 SWMU 25 Well Data Table 4-5 SWMU 13 Long-Term Monitoring Program Table 4-6 SWMU 13 Well Data Table 4-7 SWMU 26 Long-Term Monitoring Program Table 4-8 SWMU 26 Well Data FIGURES Figure 1-1 TEAD-S Site Map Figure 1-2 Basewide Groundwater Quality Map Figure 1-3 General Groundwater Flow Direction and Drinking Water Wells Figure 1-4 Geology and Hydrogeology Block Diagram of TEAD-S Figure 1-5 Groundwater Recharge and Discharge Areas and Aerial Distribution of Well Screen Hydraulic Conductivities Figure 3-1 TEAD-S Monitoring Well Network Figure 4-1 Long-Term Monitoring Plan at SWMU 1 and the Buffer Zone Figure 4-2 Long-Term Monitoring Plan at SWMU 25 Figure 4-3 Long-Term Monitoring Plan at SWMU 13 Figure 4-4 Long-Term Monitoring Plan at SWMU 26 Groundwater Management Plan Revision 3 iii Tooele Army Depot, Utah and Defense Depot Ogden, Utah ACRONYMS AND ABBREVIATIONS μg/L micrograms per liter amsl above mean sea level AOC area of concern bgs below ground surface Brice Brice Engineering, LLC btoc below top of casing CAMDS Chemical Agent Munitions Disposal System CERCLA Comprehensive Environmental Response, Compensation, and Liability Act CMI Corrective Measures Implementation CMS Corrective Measures Study COPC contaminant of potential concern Cr(VI) hexavalent chromium CTA Combat Training Area CTC carbon tetrachloride DCD Deseret Chemical Depot DEHP bis(2-ethylhexyl) phthalate DFW definable feature of work DMM discarded military munitions DWMRC Division of Waste Management and Radiation Control EPA U.S. Environmental Protection Agency g/cm3 grams per cubic centimeter g/mL grams per milliliter GMP Groundwater Management Plan HARR Hydrogeological Assessment and Recommendations Report HCE hexachloroethane HWMU Hazardous Waste Management Unit ID identification IDF Individual Disposal Feature IDW investigation-derived waste IRA Interim Remedial Action LNAPL light non-aqueous phase liquid LTM long-term monitoring MICC Mission and Installation Contracting Command mg/L milligrams per liter mL milliliters MW monitoring well NA not available NFA No Further Action No. Number