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Interim Investigation Report June 21, 1996 Chapin Brothers Automotive Stockton, California were also completed as part of SEACOR's investigation Based on the results of these tests, SEACOR recommended vapor extraction be used to mitigate site contamination is Audit Services GAS drilled five additional soil borings and constructed one Geologic (GAS) dually completed 4-in vapor extraction well/2-in air sparging observation well, one 2-m air sparging observation well, one dually completed 2-in air sparging 12-in vapor extraction well, one 4-in vapor extraction well, and one air sparging well GAS subsequently performed an air ' sparging /vapor extraction feasibility test GAS estimated a radius of influence of 37 ft based on the results of the test ' In February 1996, Lush Geosciences was retained to implement remediation of site contamination utilizing vapor extraction/ air sparging, construct an additional groundwater monitor well on property southwest of the site, and resume quarterly monitoring of all of the groundwater monitor wells 1 1 I Current Investigation A Workplan for further investigation was filed and accepted by the City and County of San Joaquin Department of Environmental Health This phase of our site investigation included drilling 3 soil borings, installing, one groundwater monitoring well and two additional vapor extraction/air sparging wells, and collecting soil and groundwater samples from all site wells for ' laboratory analyses i 2.0 SOIL BORINGS Details of field methods used during soil borings and well construction are presented in Appendix A The Workplan called for three soil borings, one to be converted to a 2-in diameter monitoring well, and two to be converted to 4-in diameter vapor extraction wells Soil borings LB 1, LB2, and LB3 were drilled on March 7, 1996 and converted into groundwater monitoring wells VE-5, VE-6, and MW-5, respectively Samples were described using the Unified Soil Classification System (Figure B 1), descriptions of the materials encountered are presented on Logs of Borings in Appendix B (Figures B2 through 134) ' Soil samples from each of the three borings were analyzed for TPHg using Environmental Protection Agency (EPA) Method 8015 (modified for gasoline) with purge and trap EPA Method 5030 and for volatile gasoline constituents BTEX using EPA Method 8020 with purge and trap EPA Method 5030 Soil samples were analyzed by Sparger Technology Analytical Laboratories of Sacramento, California Sparger is certified by the State of California for these analyses I 530-001 - z LusH GEasciEriCEs