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. Work Plan For Well Installation and Feasibility Testing 7 Ranch Market Site 23569 South Santa Fe Road Riverbank California Se tember 13 2000 • Dissolved oxygen (DO) in the four groundwater monitoring wells prior to starting the test, four hours into the test, and after termination of the test Dissolved oxygen (DO) will also be monitored in the air sparge well and six vapor wells prior to starting the test and after termination of the test • The depth-to-groundwater (DTW) levels will be measured and recorded to the nearest 0 01 foot using an electronic water level Indicator in wells MW-1, MW-2, MW-3, and MW-4 prior to starting the test, four hours Into the test, and after termination of the test, • FID readings of the extracted vapor stream from the six individual SVE wells and air treatment inlet (pre-dilution) every 30 minutes and contaminant concentrations in the air treatment outlet port approximately every 60 minutes, • Lower explosive levels (LELs) in extracted vapor stream using an LEL meter at the air treatment inlet (pre-dilution) approximately every 60 minutes, and, • Four hours into the test, vapor samples will be collected from the total well field prior to the air treatment inlet (pre-dilution), Inf-AS, and the three SVE wells V-1 (AS-V-1), V-2 (AS-V-2), and V-5 (AS-V-5) prior to termination of the SVE/AS test • The air samples will be submitted to a California-certified laboratory for the analysis of TPHg, BTEX, and MTBE by EPA Method 8260B 5.5 Report Preparation A Problem Assessment Report (PAR) will be prepared following the Appendix A Tri-Regional Guidelines The report will include 1) a summary of all previous work completed at the site, 2) soil and groundwater the results from previous assessment activities, and 3) the results of the SVFJAS feasibility test The report will include SVE and AS obtainable flowrates and vacuums/pressures, radii of influences to determine both SVE and AS well spacing, and contaminant mass removal rates to properly size the SVFJAS equipment The PAR will include evaluation and selection of the most feasible remedial method for the removal or insitu destruction of gasoline range petroleum hydrocarbons adsorbed to soil and dissolved in groundwater at the site The PAR will be submitted to the RWQCB-CVR and the SJCEHD for . review and comment File Ranch Market\Report Wl WdIIstsW Fe sMLty t WICP wpd