Report: Pohatcong Valley Groundwater Contamination Site
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I SDMS Document 106290 POHATCONG VALLEY GROUNDWATER CONTAMINATION SITE STATEMENT OF WORK FOR EPA REGION 6 RESPONSE ACTION CONTRACT 4 JUNE 1,1999 I 300034 I EXECUTIVE SUMMARY i 0.0 INTRODUCTION 1 O.I SCOPE OF WORK OBJECTIVES 2 0.2 WORK PLAN FORMAT 2 0.3 REFERENCES 3 0.4 BACKGROUND 3 0.4.1 Site Location And Description 3 0.4.2 Site History 4 0.43 Sealed Private WeUs 7 0.4.4 Site Geology 7 0.4.4.1 Stratigraphy and Lithology 7 0.4.4.2 Structure 9 0.4.4.3 Geologic Features and Implications for Groundwater Movement 10 0.4.5 Site Conceptual Hydrogeologic Model 10 0.4.5.1 General Hydrologic Conditions 11 0.4.5.2 Thickness And Hydraulic Properties Of The Glacial Deposits 12 ^^ 0.4.5.3 Recharge, Movement, And Discharge Of Groundwater In The Glacial ^B Deposits 13 0.4.5.4 Bedrock Beneath The Valley And Hydraulic Properties 14 0.4.5.5 Water Levels In The Bedrock Aquifer 14 0.4.5.6 Recharge, Movement, And Discharge Of Groundwater From the Bedrock AquiferlS 0.4.5.7 Groundwater • Surface Water Interchange 15 0.4.6 Site Contaminants 15 0.4.6.1 Groundwater 15 0.4.6.2 Soil 16 0.4.6.3 Historical Uses 16 0.4.6.4 Fate And Transport 16 0.5 PRELIMINARY HUMAN RISK ASSESSMENT 18 0.5.1 Potential Source Areas 19 0.5.2 Migration Pathways 19 0.53 Routes of Exposure, Potential Receptors, and Preliminary Assessment of Risk 20 0.5.4 Public Health and Environmental Assessment Data Needs 23 0.6 PROBLEM SUMMARY23 0.6.1 Site Investigation Plan 24 0.6.1.1 Methodologies For Identifying PSAs 24 ^^ 300035 I 0.6.1.2 Recommended Actions For PSAs 25 0.6.1.2.1 PSAs Requiring Field Investigations 25 0.6.1.2.2 Sites Requiring Site Inspections 26 0.6.1.2.3 Sites Requiring No Further Action 26 0.6.2 Hierarchical List of PSA Sites 26 0.6.3 Preliminary Identification of Potential Remedial Technologies 27 0.6.3.1 General Response Actions 27 0.6.3.2 Potential Remedial Technologies 29 0.6.4 ARARs and Guidance To Be Considered 29 0.6.4.1 Definition of ARARs and TBCs 29 0.6.4.2 Types of ARARs and TBCs 30 0.6.4.3 Consideration of ARARs During the RI/FS 31 0.6.5 Preliminary Remedial Action Objectives 32 0.6.6 DQO D€termination32 0.6.7 Field Investigation Scope of Work 35 TASK I PROJECT PLANNING AND SUPPORT 40 1.1 Project Management 40 1.2 Access Agreements 40 1.3 Project Organization, Schedule and Costs 41 1.3.1 Project Organization 41 1.3.2 Initial Site Inspection4l 1.3.3 Scoping Meeting 41 1.3.4 Work Plan Submittal 41 * TASK 2- COMMUNITY RELA TIONS 42 2.1 Project ImplemerBtation42 2.2 Public Meeting/Public Availability Session Support 42 23 Fact Sheet Preparation 43 2.4 Develop an Internet Site 43 2.5 Prepare Public Notices 44 2.6 Prepare and Update a Site Mailing List 44 TASK 3 FIELD INVESTIGATIONS 44 3.1 Collection and Evaluation of Existing Data 45 3.2 Fracture Trace Analysis 46 33 Cultural Resources Investigation 47 3.4 Subcontract Procurement 48 3.5 Delineation of Wetlands 49 3.6 Survey of Endangered Species Habitat 50 3.7 Mobilization 50 3.8 Soil Gas Investigations 51 3.9 SampUng Existing Wells 52 3.10 Surface Geophysical Investigations 54 3.11 Drilling, Subsurface Sampling, and Well Installation 55 3.12 Downhole Geophysical Investigations 66 I 300036 I 3.13 Surface Water and Sediment Sampling 69 ^JP 3.14 Surveying 70 3.15 Quarterly Monitoring and Sampling 71 3.16 Landscape Restoration 72 3.17 Demobilization 73 3.18 Phase I Report 73 3.19 Phase U RI Work Plans 74 3.20 Phase II Mobilization 74 3.21 Surface and Borehole Geophysical Investigations 74 3.22 Drilling and Environmental Sampling 74 3.23 Hydraulic Testing 75 3.24 Dye Tracer Tests 76 3.25 Ecological Sampling 78 3.26 Surveying 78 3.27 Landscape Restoration 79 3.28 Phase II Demobilization 79 TASK 4 SAMPLE ANALYSIS 79 4.1 Sample Management and Tracking 80 4.2 Sample Analyses 81 43 Independent Laboratory Analysis 82 4.4 Delivery of Analytical Services Laboratory Procurement 83 4.5 Sample VaUdation 83 4.6 Quality Assurance Officer 85 TASK 6 DATA EVALUATION 85 6.1 Database and GIS Development 85 6.2 Evaluation of Analytical Data 91 6.3 Evaluation of Other Data 92 6.4 Graphical Presentation of Data 93 6.5 Phase II RI Groundwater Flow and Chemical Transport Modeling 94 Groundwater Flow Model 94 Fate and Transport Modeling 96 TASK? RISK ASSESSMENT 97 7.1 Phase I - Risk-Based Screening 97 7.1.1 Initial Screening - Soil Gas Survey 97 7.1.2 Risk-Based Screening - Human Health Direct Contact 98 7.1.3. Risk-Based Screening - Human Health Impact to Groundwater 99 7.1.4 Risk-Based Screening - Ecological Criteria 99 7.1.5 Reporting Results - Risk-Based Screening 100 7.2 Phase II - Baseline Risk Assessments 100 7.2.1 Human Health Risk Assessment 101 7.2.1.1 Site Visit and Meeting 101 7.2.1.2 Data Collection and Evaluation 101 7.2.1.3 Quantitative Evaluation 104 ^W 300037 I 7.2.1.4 Current Land-Use Conditions 105 7.2.1.5 Future Land-Use Conditions 106 7.2.1.6 Toxicity Assessment and Documentation 108 7.2.1.7 Risk Characterization 109 7.2.1.8 Qualitative Evaluation of Chemicals Without Toxicity Criteria 110 7.2.1.9 Discussion of Uncertainties 110 7.2.2 Ecological Risk Assessment 110 TASK 8 TREATABIUTYSTUDY/PILOT TESTING 119 8.1 Disposal of RI/FS Generated Wastes 119 TASK 9 REMEDIAL INVESTIGATION REPORT 120 9.1 Draft Remedial Investigation Report 120 9.2 Final Remedial Investigation Report 122 3 Meetings 123 TASK 10 REMEDIAL ALTERNATIVES SCREENING 123 TASK II REMEDIAL ALTERNATIVES EVALUATION 124 11.1 Remedial Technologies Evaluation 124 11.2 FS Groundwater Flow and Transport Modeling 128 TASK12 FEASIBILITY STUDY REPORT AND RI/FS REPORT 129 • 12.1 Development Of Remedial Action Objectives, General Response Actions, and Volumes of Contaminated Media 130 12.2 Identification Of Applicable Technologies And Assembly Of Alternatives- 131 12.3 Draft Feasibility Study Report 132 12.4 Final FeasibiUty Study Report 134 12.4.1 Meetings 134 TASK 13 POST RI/FS SUPPORT 134 13.1 Public Notices 134 13.2 Proposed Plan 134 133 Proposed Plan Public Meeting 135 13.4 Responsiveness Summary 135 TASK 16 WORK ASSIGNMENT CLOSEOUT 136 16.1 Technical FUe Closeout 136 16.2 Accounting File Closeout 136 16.3 WACR Preparation 136 REFERENCES 136 I 300038 ft APPENDICES APPENDIX A - FACILrrY PROFILES APPENDIX B - 1 JUNE 1998 HIERARCHICAL LIST OF SITES LlSTOFnGURES** Figure 1-1 Site Location Map Figure 1-2 Site Topography Map Figure 4-1 Drilling Cost Comparison Figure 4-2 Sampling Location Map: Washington Township Municipal Garage Figure 4-3 Sampling Location Map: Warren Controls, Broadway Restoration, . Sinclair Station, Warren County Vocational School, Luckey's Autobody, Fielbach Welding Figure 4-4 Sampling Location Map: Modem Valet, L&L Dry Cleaners, Szathmary Building Supply, Washington Auto Top and Trip, % Maxon Chevrolet/Ashman Autobody, Blews Brothers Autobody, Washington Borough Garage, Warren County Auto Parts, Mobil Gas Station, Washington Theatre, Rossi Pontiac, Washington Transmission. Rossi Body Shop Figure 4-5 Sampling Location Map: Tung-Sol Tubing, BASF Corporation, Washington Auto Parts, Somerset Tire Service, Smith Motors, Petty's Tire and Auto Figure 4-6 Sampling Location Map: American National Can Company, Standard Oil Tank Farm, Szalbrit Residence, Vikon Tile Corporation (Former), Mike's Autobody, Mueller Roofing Metric Motors, '70" Garage, Washington Auto Salvage Figure 4-7 Sampling Location Map: Five Carp Company, Dave's Friendly Service Station, Stew's Autobody, Gulf Service Station, Guy's Auto Service, Banner Pontiac (Former) New Jersey Bell, Bill and Vem's Service, Opdykes Sales and Service Figure 4-8 Sampling Location Map: Washington Porcelain Company (Former), AID Models Hedges and Brothers Figure 4-9 Sampling Location Map; Brockway Plastics 300039 I Figure 4-10 Sampling Location Map: Highpoint Sanitary Landfill Figure 4-11 Sampling Location Map: Agway Energy Products, Pohatcong Service Station, Red's Autobody Figure 4-12 Sampling Location Map: Kober's Auto Parts Figure 4-13 Sampling Location Map: Victualic Figure 5-1 Project Organization •Broadway Lawn Mower, Broadway Motors, and JCP&L are not represented on these figures. 4 300040 I I LIST OF PLATES PLATE NO. 1 Site Base Map 2 Site Base Map - Washington Twp. 3 Site Base Map - Franklin Twp. 4 1984 Warren County Health Dept Study of TCE in Domestic Wells and the Current Water Main Extensions 5 Geologic Map and Cross Section 6 Monitoring Well Locations 7 Monitoring Well Locations - Washington Twp. 8 Monitoring Well Locations - Franklin Twp. 9 Domestic Well Locations 10 Domestic Well Locations - Washington Twp. 11 • Domestic Well Locations - Franklin Twp. 12 Sites Identified Within the PVGCS m 13 Potential Source Areas Within the PVGCS 14 Potential Source Areas - Washington Twp. 15 Potential Source Areas - Franklin Twp. 16 Wetland Map 17 Proposed RI Well Sampling Locations 18 Field Testing Locations 19 Project Scheduling I 300041 LIST OF TABLES 2-1 Soil and Groundwater Contaminants Detected in Environmental Media 2-2 Range of Biodegradation Rates and Transport Characteristics of Chlorinated Organic Solvents Cited in Scientific Literature 2-3 Contaminant Screening Levels and Method Detection Limits for Volatile Organics in Surface and Groundwater 0 2-4 Contaminant Screening Levels for Semivolatile Organics in Surface and Groundwater 2-5 Contaminant Screening Levels for Inorganics in Surface and Groundwater 2-6 Contaminant Screening Levels for Volatile Organics in Soil and Sediments 2-7 Contaminant Screening Levels for Semivolatile Organics in Soil and Sediments 2-8 Contaminant Screening Levels for Inorganics in Soil aral Sediment 3-1 Sites Within PVGCS Identified by the 1997 File Review and