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San Joaquin County DIRECTOR oP. ' . , . . . Environmental Health Department Donna Heran, REHS M ASSISTANT DIRECTOR 2 i 600 East Main Street Laurie Cotulla, REHS �}g�' 'q '� Stockton , California 95202-3029 PROGRAM COORDINATORS .. Carl Borgman, REHS Mike Huggins, REHS, RDI Cq F o R��P Website: www.sjgov. org/ehd Margaret Lagorio, REHS Phone: (209) 468-3420 Robert McClellan, REHS Fax: (209 ) 464m0138 Jeff Carruesco, REHS, RDI Kasey Foley, REHS July 25, 2008 Mr. David Atwater Van De Pol Enterprises, Incorporated Post Office Box 1107 Stockton, California 95201 Subject: Pacific Pride — South EI Dorado Street 3147 South El Dorado Street Stockton, CA 95206 The San Joaquin County Environmental Health Department (EHD) has reviewed Additional Assessment & SVE Feasibility Testing Work Plan — June 2008, dated July 1 , 2008, prepared and submitted by Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above- referenced site. The work plan was submitted in response to EHD ' s letter dated March 18 , 2008 , directing additional investigation to address the lateral extent of the dissolved petroleum- hydrocarbon plume down gradient of monitoring wells MW-9 and MW- 10. In the work plan, AGE proposes to install one monitoring well southeast of MW-9 in the middle tum lane of El Dorado Street. For safety reasons, the EHD does not believe a monitoring well should be installed in the turn lane. Instead, the EHD recommends relocating the monitoring well south of MW-9 on the west side of South El Dorado Street, and installing another monitoring well down gradient of MW-9 on the east side of South El Dorado Street. Also, the EHD believes a monitoring well is needed down gradient of MW- 10 on the east side of El Dorado Street to laterally define the 1 ,2-dichloroethane (1 ,2-DCA) plume. The EHD approves the installation of the three soil vapor extraction (SVE) wells at locations illustrated on Figure 2 of the work plan, and the performance of an eight-hour SVE pilot test to determine if this is a viable remedial method for reducing the concentrations of petroleum hydrocarbons present in soil and groundwater. The SVE wells will be advanced using ten-inch diameter hollow-stem augers, and will be screened at approximately ten to thirty feet below surface grade (bsg) . Soil samples will be collected at five-foot intervals beginning at ten feet bsg for lithological evaluation, but soil samples will not be collected for chemical analysis. The eight-hour SVE pilot test will be conducted from SVE well VW- 1 and include observation