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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> r.' 600 East Main Street <br /> PROGRAM COORDINATORS <br /> { Stockton, California 95202-3029 Robert McClellon, REHS <br /> • Jeff Carruesco,RENS, RDI <br /> Cq •..,••..•�j�P Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> �/FOR <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> July 21, 2010 <br /> Mr. Den and Ms. Betty Ueda Mr. James Ueda, Program Director II <br /> 626 East Galin Road State of California Department of General Services <br /> French Camp, California 95231 Professional Services Branch <br /> Seismic and Special Programs Section <br /> 7073 rd Street, Suite 4-330 <br /> West Sacramento, California 95605 <br /> Subject: Den's Auto Repair <br /> 308 South EI Dorado Street <br /> Stockton, California 95203-3404 <br /> Dear Mr. and Ms. Ueda: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Monitoring Well Installation Work Plan (work plan), dated 18 June 2010, prepared and <br /> submitted by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE), on your behalf <br /> for the above-referenced subject site. In the work plan, AGE proposes to install three <br /> groundwater monitoring wells. Two of the proposed wells will be screened in the depth- <br /> interval identified as Hydrologic Unit HU2 [approximately forty-five to ninety feet below surface <br /> grade (bsg)] and one proposed well will be screened in the depth-interval identified as HU3 <br /> (approximately ninety to one-hundred twenty-five feet bsg) at locations illustrated on Figure 2 <br /> of the work plan. <br /> The EHD approves the installation of the three proposed off-site monitoring wells located in <br /> the City of Stockton right-of-way to assess the vertical and lateral extent of petroleum <br /> hydrocarbon contamination in soil and groundwater at your site; however, as mentioned by <br /> letter dated 15 April 2010, the EHD recommends the proposed well west of your site be <br /> located west of MW-1A/MW-1B and north of cone penetration test (CPT) boring CPT-4. Two <br /> of the proposed wells will be screened at approximately sixty to sixty-five feet bsg, and one <br /> well will be screened at approximately one-hundred-ten to one-hundred-twenty feet bsg. (The <br /> EHD had conditionally approved the installation of the two wells in the area of CPT-3 by letter <br /> dated 15 April 2010.) <br /> AGE proposes to collect soil samples at five-foot intervals beginning at fifteen feet bsg when <br /> installing the one well to total depth of approximately one-hundred-twenty feet bsg to the north <br /> of your site and installing the well to total depth of approximately sixty-five feet bsg to the west <br />