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San Joaquin County of Public Works January 15, 1999 <br /> Workplan for Site Assessment <br /> In Area 4, the soil samples will be analyzed for total recoverable petroleum hydrocarbons <br /> using EPA Method for TRPH 418.1. The highest concentration of TRPH will be used to <br /> analyze Title 22 CAM 17 metals, PCB, organochlorides and pesticides using EPA Method No. <br /> 8080, chlorinated hydrocarbons using EPA Method No. 5030/8240, and BTEX using EPA <br /> Method No. 8010/8020. All analytical data will be reported by a California-Certified <br /> laboratory. <br /> Task 9: Report Preparation <br /> Upon completion of the field work and receipt of the analytical results, a report will be <br /> prepared by TEM. The report will include soil boring logs, well permits, as-built construction <br /> details of groundwater monitoring wells, analytical results of both soil and groundwater <br /> samples, isoconcentration maps for TPH, benzene and MTBE, a groundwater contour map <br /> depicting the hydraulic gradient and direction of groundwater flow across the SITE, and the <br /> current groundwater elevation data. <br /> PROJECT SCHEDULE <br /> The proposed work can be initiated upon written approval of the workplan by SJCPHS. A <br /> final report can be submitted to the SJCPHS within 60 days of completion of the field work <br /> and receipt of all laboratory reports and disposal manifests. <br /> CLOSURE <br /> Should you have any questions regarding this workplan, please contact any of the undersigned <br /> at (714) 560-8200 at your convenience. <br /> Very truly yours, <br /> TAIT ENVIRONMENTAL MANAGEMENT, INC. <br /> Edward A. Batlle Richard L. Coffman, Ph.D., R.G. <br /> Director Senior Geologist <br /> Attachments: Figure 1 - Site Plan with Proposed Well Locations <br /> Cc: Stan Iverson <br /> M:\TEM2\Clients\SANJOAQUIN\sanjoaquinworkpian.dm <br /> 6 <br />