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W � <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Q: PROGRAM COORDINATORS <br /> W :{ Stockton, California 95202-3029 Robert McClellon,REHS <br /> •'• Jeff Carruesco,REHS,RDI <br /> • "•' <br /> Website: www.sjgov.org/ehd Kasey Foley,RENS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> April 16, 2010 <br /> Mr. John Johnson <br /> Former Cheaper Store Number 37 <br /> 765 Eubanks Drive, Suite D <br /> Vacaville, California 95688 <br /> Subject: Former Cheaper Store Number 37 <br /> 15 East Grant Line Road <br /> Tracy, California 95376-2720 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Summary Report of Additional Subsurface Investigation, dated March 1, 2010, prepared <br /> and submitted by ATC Associates Inc. (ATC) on your behalf for the above-referenced site. <br /> In the report, ATC presents the findings from analysis of soil and grab groundwater <br /> samples collected from - soil boring SB-6, and grab groundwater samples from <br /> hydropunch® sampling points HP-1 and HP-2 to further evaluate the lateral and vertical <br /> extent of impacted soil and groundwater. <br /> Analytical results from this investigation indicate that none of the chemicals of concern <br /> was detected in the two grab groundwater samples collected from the two hydropunch® <br /> borings HP-1 and HP-2. Also analytical results from the one soil sample collected from <br /> soil boring SB-6 at approximately nine feet below surface grade.(bsg) were non-detect for <br /> chemicals of concern. Only one grab groundwater sample collected from soil boring SB-6 <br /> at approximately seven to twelve feet bsg was found to contain methyl tertiary-butyl ether <br /> (MTBE) at a concentration of 32 micrograms per liter. Based on these results, ATC <br /> proposes to collect confirmation samples in the vadose zone to provide current data that <br /> may be used to calculate a more accurate residual mass; and conduct a soil gas study to <br /> evaluate the potential for vapor intrusion into the onsite building. <br /> The EHD concurs with the recommendation to evaluate the potential for vapor intrusion <br /> inside structures at this site and directs the submittal of a work plan to collect soil gas <br /> samples by June 25, 2010. Residual concentrations should be compared to the <br /> Environmental Screening Levels. (ESLs) established by the San Francisco Bay Regional <br /> Water Quality Control Board, for gross contamination and direct exposure, and to the <br /> California Human Health Screening Levels (CHHSLs) established by the California <br /> Environmental Protection Agency; an evaluation of the need to collect soil gas samples <br /> should be included. <br />