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.f <br /> r <br /> San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> O .� C 'f ASSISTANT DIRECTOR <br /> Y•;: se• O <br /> y i 600 East Main Street Laurie Cotulla,REHS <br /> N. Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins, REHS, RDI <br /> Fg r• Margaret Lagorio, REHS <br /> Website: WWW_Sjgov.org/ehd Robert MGClellon, REHS <br /> qC1 FORS <br /> Phone: (249) 468-3420 Jeff Carruesco,REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley, REHS <br /> May 29,2009 <br /> Mr. Amrit Grewal <br /> Grewal's Market <br /> 4100 East Fremont Street <br /> Stockton, California 95215 <br /> Subject: Grewal's Market <br /> 4100 East Fremont Street <br /> Stockton,CA 95215 <br /> By letter dated May 11, 2009, the San Joaquin County Environmental Health Department (EHD) <br /> directed the collection of a grab groundwater sample at the southwest corner of the above-reference <br /> property. This was to verify the "detection of total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) [800 micrograms per liter (µg/L)] in groundwater samples collected at sixty-five to <br /> seventy-five" feet below surface grade (bsg) from nearby cone penetration test (CPT) borehole <br /> P-15B/65-75. <br /> The EHD has reexamined the historical groundwater data at Grewal's Market and has concluded <br /> that the concentration of TPH-g detected in P-15B is not likely to represent a significant dissolved <br /> mass migrating southwest of the.petroleurn hydrocarbon source area, as.indicated by the following <br /> data: <br /> • Groundwater samples collected at sixty-six to seventy-one feet bsg from CPT borehole <br /> P-16/66-71, approximately seventy-five feet northwest of P-15B, were non-detect for <br /> TPH-g. <br /> • Groundwater samples collected from monitoring well MW4, screened between forty-eight <br /> and,sixty-eight feet bsg, and approximately sixty feet north of P-1513, were non-detect for <br /> TPH-g. <br /> • Groundwater samples collected from MW-1, screened between fifty and seventy feet bsg, <br /> and approximately one-hundred-twenty feet northeast of P-15B, were non-detect for <br /> TPH-g. <br /> • Groundwater samples collected at seventy-two to seventy-six feet bsg from CPT borehole <br /> CPT-01-76, approximately one-hundred feet north/northeast of P-1513, were non-detect for <br /> TPH-g. <br /> • Groundwater samples collected at fifty-five to fifty-nine feet bsg and seventy-six to eighty <br /> feet bsg from CPT boreholes CPT-02-59 and CPT-02-80, respectively, approximately fifty <br /> feet east of P-15B, were non-detect for TPH-g. <br /> r. <br />