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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> I! oP°-`''"w..� Environmental Health Department <br /> I' ASSISTANT DIRECTOR <br /> Z: ,? 600 East Main Street Laurie Cotulla,REHS <br /> 4 Q., Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> L IliCly <br /> Carl Borgman,REHS <br /> • Mike Huggins,RENS,RDI <br /> cA�i F o a :P Website: wwW.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 ,teff Carruesco,RENS,RDI <br /> Kasey Foley,REHS <br /> June 10,2008 <br /> Mr.John Johnson <br /> Former Cheaper Store Number 37 <br /> 765 Eubanks Drive, Suite D <br /> i Vacaville, California 95688 <br /> i <br /> i Subject: Former Cheaper Store Number 37 <br /> 15 East Grant Line Road <br /> Tracy,California 95376-2720 <br /> i <br />+ The San Joaquin County Environmental Health Department (EHD) has reviewed current <br /> quarterly groundwater monitoring reports for the above-referenced site submitted by ATC <br /> Associates Inc. (ATC)on your behalf and believes additional investigation is needed to define the <br /> methyl tertiary-butyl ether (MTBE) plume both vertically, at the source area, and toward the <br /> north and west of your site in the deeper aquifer zones. Although laboratory analytical results <br /> indicate that MTBE concentrations have generally declined during the first quarter 2008 <br /> groundwater monitoring event in March 2008, significant concentrations of MTBE still exist in <br /> groundwater samples collected from monitoring wells MW-1, MW-4, and MW-5. Soil lithology <br /> interpreted from the two cone penetration test (CPT) borings is primarily gravelly sand and sand <br /> between approximately thirty-seven and forty-five feet below surface grade (bsg), and between <br /> sixty-five and seventy feet bsg. Also groundwater samples collected at sixty-seven feet bsg from <br /> CPT-2 indicate significant concentrations of contaminants of concern (COC) are present in this I <br /> deepest grab groundwater sample collected at your site. Submit a work plan to the EHD by <br /> August 20, 2008,that will include the installation of one monitoring well screened between sixty- <br /> five and seven feet bsg t <br /> o verify groundwater results collected from CPT-2 an <br /> seventy g fY�' d will address the <br /> delineation of the impacted groundwater plume both vertically, and laterally to the north, <br /> northwest, and west of your site. <br /> The EHD also directs you to provide a trend analysis of monitoring wells impacted with MTBE; <br /> and include an explanation for the periodic spikes in MTBE concentration found in monitoring <br /> wells MW-1, and MW-4 through MW-8. Submit the information to the EHD by September 19, <br /> 2008. <br /> A list of domestic, municipal, and irrigation wells located within and outside a 2,000-foot radius ` <br /> of your site were submitted to the EHD in 1998 however, the EHD directs you to submit a more <br /> comprehensive sensitive receptor survey that includes updated well locations, as well as surface ! <br /> water, hospital, and school locations. Submit the updated sensitive receptor survey to the EHD <br /> by September 19,2008. <br /> C <br />