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TABLE OF CONTENTS 1.0 EXECUTIVE SUMMARY . .. .. . . .. .... .... .... .... .... .... .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. 1 2.0 INTRODUCTION . .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . 4 2.1 Purpose . .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . . . . . 4 2.2 Scope of Work . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . 4 2.3 Current Investigation Objectives .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . . 5 3.0 SITE BACKGROUND . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. 7 3.1 Site Location . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Geologic Setting and Hydrogeology. .... .... .... .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . 8 3.2.1 Regional Hydrogeology . .. .. .... .... .... .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. 8 3.2.2 Local Hydrogeology. .. .. .. .. .... .... .... .. .. . . .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . . 9 3.3 Site History . .... .. .. .... ........ .... .... .... .... .. .. .... .. .. . . .. .... .... ............ 11 3.3.1 Lustre-Cal Nameplate Corp. Site Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... 11 3.2.2 Hazardous Materials Useage and Waste Management Practices. . . . . . . . . . . . . . . . . . . . . . . .. 11 4.0 SUMMARY OF PREVIOUS INVESTIGATIONS . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . . . . . . . . . . . . . . . . . .. 14 4.1 Soil Sampling. .... .. .. .... ............ .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .. . 14 4.2 Passive Soil Gas Sampling ............... .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .. .. 15 4.3 Drive Point Soil Gas Sampling . .. .. .. .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .... .... 16 4.4 Sewer Effluent Sampling . .. .. .. .. .. .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. ......... 17 4.5 Discrete Depth Groundwater Sampling . .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. ..... 18 4.6 Monitoring Well Sampling . .. .. .. .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .... 20 4.7 LNPA Groundwater Investigation. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .. 21 4.8 2006 Soil Gas Survey . .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. .. .. 25 5.0 PRELIMINARY SITE CONCEPTUAL MODEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. 29 5.1 Hydrostratigraphy . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . 29 5.2 Source Area Evaluation . .. .. .. .. .. .. . . .. . . .. . . .. .. .. .. .. .... .... .... .... .... .... .... .. 30 5.3 Volatile Organic Compound Migration. .. .. .. .. .. .. .... .... .... .... .... .... .... .... .... .. 30 5.4 Identified Data Gaps . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . 31 6.0 PROPOSED SCOPE OF WORK FOR CONTINUED INVESTIGATION . .... .... .... .... .... .... .... 32 6.1 Task 1 Permitting for Soil Borings. .... .... .... .... .... .... .... .... .... .... .... .... .... 32 6.2 Task 2 Subsurface Investigation. .... .... .... .... .... .... .... .... .... .... .... .... .... .. 32 6.2.1 Geophysical Clearance of Drill Sites . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . 32 6.2.2 Soil Boring Drilling and Soil Gas Sampling Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 6.2.3 Completion of Soil Borings to SVE Extraction Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 6.2.4 Groundwater Monitoring Well Installation and Development . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6.2.5 Groundwater Monitoring Well Sampling Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 6.2.6 Surveying of Deep SVE Wells and Groundwater Monitoring Well . . . . . . . . . . . . . . . . . . . . . . . 38 6.3 Task 3 Soil Gas and Groundwater Sample Laboratory Analyses . .. .. .. .. .. .. .... .... .... ... 39 6.3.1 Soil Gas and Groundwater Sample Analytical Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 39 6.3.2 Sample Documentation and Shipment . .. .. .. .. .. .. .. .. . . .. . . .. . . .. . . .. .. .. .. .. .... 39 6.4 Task 4 Investigation Derived Waste Disposal . .. .. .. .. .. .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. ... 39 6.5 Task 5 Data Evaluation and Reporting . .. .. .. .. .. .. .. .. .. .. .. .. .. .. . . .. . . .. . . .. . . .. .... 41 6.6 Task 6 Site Characterization Report and Remediation Feasibility Study . . . .. . . .. . . .. . . .. . . .. . 41 6.6.1 Site Characterization Report . .. .. .. .. .. .. .. .. .. .. .. .. .. .. . . . . . . .. . . .. . . .. . . .. . . .. 41 6.6.2 Remediation Feasibility Study . . . .. . . .. . . .. . . .. . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Environmental\LNC\Workplanl0152007.wpd 1