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San Joaquin County DIRECTOR <br /> PQ i N Donna Heran,REHS <br /> �O OO Environmental Health Department ASSISTANT DIRECTOR <br /> 2_ 2 600 East Main Street Laurie Cotulla,REHS <br /> Un <br /> ;{ Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> .. <br /> Carl Borgman, REHS <br /> Mike Huggins,REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 .teff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> DAVID ATWATER SEP 0 6 2007 <br /> VAN DE POL ENTERPRISES INC <br /> P O BOX 1107 <br /> STOCKTON CA 95201 <br /> RE: Pacific Pride—West Lane SITE CODE : 1288 <br /> 3230 North West Lane RO: 666 <br /> Stockton, CA 95204 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Report — Second Quarter 2007 dated August 20, 2007, prepared and submitted by <br /> Advanced GeoEnvironmental, Inc. (AGE) on your behalf. Analytical results for <br /> groundwater samples collected from five monitoring wells on April 10, 2007, were <br /> included in this report. The only compound detected was 1,2-dichloroethane (1,2-DCA) <br /> found for the first time in groundwater samples collected from monitoring wells MW-4 <br /> and MW-5R at 2.4 micrograms per liter(µg/L) and 3.8 µg/L, respectively. AGE sampled <br /> these two wells again on April 20, 2007, as directed by EHD by letter dated May 7, 2007, <br /> and confirmed that 1,2-DCA was present in MW-4 and MW-5R at 2.2 and 2.0 µg/L, <br /> respectively. As a result, AGE recommended advancement of three soil borings located <br /> southwest of MW-4 and MW-5R. EHD questions the proposed placement for these <br /> borings. Although groundwater flow direction during the first quarter 2007 was reported <br /> to be toward the southwest, historically groundwater flow direction has been variable <br /> (predominantly southeast). Also, 1,2-DCA has been detected in the two deepest <br /> monitoring wells (MW-4 and MW-5R) screened between approximately 60 and 70 feet <br /> below ground surface (bgs) and located directly north of municipal well number 77 <br /> (MW-77); however, none of the proposed soil boring locations is between this municipal <br /> well and MW-5R located approximately 250 feet north of MW-77. Submit a work plan <br /> to EHD by October 26, 2007, to address the 1,2-DCA groundwater plume and provide <br /> technical justification for all proposed work. <br /> By letter dated May 7, 2007, EHD directed you to evaluate the potential for vapor <br /> intrusion into buildings either by submitting a work plan by July 25, 2007, or by <br /> providing rationale, with technical support, for discounting vapor intrusion into buildings <br /> as a potential hazard for this site. To date, EHD has not received a response to this <br /> directive. In Quarterly Report — Second Quarter 2007, AGE recommended the <br /> advancement of three soil borings for collection of soil gas samples. Submit either a <br /> work plan to assess the potential for vapor intrusion or rational for discounting the <br /> potential threat from vapor intrusion into buildings to EHD by October 25, 2007. <br />