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r <br /> r <br /> 1 INTRODUCTION <br />' On behalf of A. Teichert & Son, Inc. (Teichert), EMCON Associates has <br /> prepared this problem assessment report and final remediation plan. The <br /> contents of this document are consistent with guidelines in Appendix A- Tri- <br /> regional Board Staff Recommendations for Preliminary Investigation and <br /> Evaluation of Underground Tank Sites. This document includes the results <br />' of the recent soil and ground-water characterization conducted at the <br /> Teichert facility at 103 North E Street, Stockton, California (see Figure 1). <br />' In summary, this report presents details of the soil and ground-water <br /> characterization activities, details of the pilot-scale soil vapor extraction test <br /> (SVET), analytical results, conclusions, and recommended remedial actions. <br /> r Teichert contracted EMCON Associates for assistance in characterizing soil <br /> and ground water at the site and recommending appropriate remedial <br /> actions, if warranted. The objectives of the recent site activities were to <br /> rO characterize first-encountered ground water at the site <br /> G assess whether residual petroleum hydrocarbon <br /> concentrations in the soil adjacent to the former tank <br /> complex at the mobile equipment facility were sufficiently <br />' low for closure to be granted for the site <br /> conduct a pilot-scale SVET to assess whether the site <br /> conditions were suitable for this remedial technology <br /> rThese activities were conducted consistent with EMCON Associates' May <br /> 1992 Work Plan for Soil Remediation and Ground-water Characterization, <br /> r (see Appendix A) as approved by Teichert and the San Joaquin County <br /> Department of Environmental Health, EMCON Associates' July 30, 1992, <br /> well permit application (which referenced a scope modification to the work <br /> r plan), and EMCON Associates' October 2, 1992, letter to the San Joaquin <br /> County Air Pollution Engineer. <br />' In summary, the work included drilling three exploratory soil borings near <br /> the former tank complex at the mobile equipment facility, converting two of <br /> the borings to ground-water monitoring wells, collecting and analyzing soil <br /> r samples from the borings and ground-water samples from the new and <br /> existing ground-water monitoring wells, and conducting a pilot-scale SVET. <br /> Based on an evaluation of the monitoring data, remedial alternatives were <br /> evaluated and soil vapor extraction (SVE) selected. <br /> rpj010f9010f900020.1 ag 1 - 1 Rev. 0 December 15, 1992 <br />