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San Joaquin County OrRE=R <br /> "" Environmental Health Department Donna HaarF RENS <br /> a ECTOR <br /> 600 East Maln Street ALBurie Co 1%REHS <br /> �- Laurie Cohria,RENS <br /> ` Stocktan,California 952023029 <br /> PROGRAM OOORWNAMR3 <br /> y Cert aorgman,REHS <br /> e4r`kaRa Websfte:wwwrsJgov.OVehdSIr REFG,Rut <br /> Pbone: (208)466-3420 MB'�tet�OeO•REM <br /> Fax (208)464-0138' Jeff CsrareREHS,RRoi <br /> September 23,2008 Kaearrol,RENS <br /> Mr.Michael Kamelot <br /> Quik Stop Markets,Incorporated <br /> 4567 Enterprise Street <br /> Fremont,California 94538 <br /> SubJect: Quik Stop Market No.132 <br /> 3555 West Hammer Lane <br /> Stockton,CatffOrnla 95209 <br /> The San Joaquin County Environmental Health Department(Efla)has reviewed historical <br /> soil and groundwater analytical data for the above-referenced site and discussed the site <br /> information with the Central Valley Regional Water Quality Control Board(CVRWQCB) <br /> staff on September 17,2008. <br /> Depth to groundwater has historically been reported between 6.95 and 18.45 feat below <br /> surface grade(bsg);however,since March 1996,depth-to-groundwater measurements have <br /> been reported between approximately 7 and 11.5 feet hs g Of the eighf remaining <br /> monitoring wells at this site,only MW screened between 9 and 19 feet bsg,is screened <br /> across the first water-bearing zone identified at approximately 5 to 10 feet bsg. Monitoring <br /> wells MW-2, MW-3, and MW-8 are screened between 20 and 30 feet bsg; MW4 is j <br /> screened between 16.5 and 26.5 feet bsg;MW-6 is screened between 16 and 21 feet bsg; <br /> and MW-7 is screened between 17 and 23 feet bsg. Data from quarterly groundwater <br /> monitoring events indicate that methyl tertiary-butyl tither(MTBE)concentrations were not <br /> reported groundwater samples until March 1996, approximately five-and-a-half years <br /> after the initial petroleum hydrocarbon leak was detected. The E RD is concerned the i <br /> MTBE plume may have.migrated laterally in the permeable sand unit at approximately 10 <br /> feet bsg. This hypothesis is supported by high concentrations of MTBE reported in <br /> groundwater samples collected from soil boring SB-I at 10 feet bsg in July 2001, and mi <br /> groundwater samples collected from MW-5 daring the quarterly monitoring events. The <br /> lateral extent of petroleum hydrocarbon contamination in the first water-bearing zone must <br /> be addressed. <br /> In addition,MTBE was detected at 39 micrograms per liter(}rg/L)in groundwater samples <br /> L <br /> collected at 42 feet bsg from ATC-5,the deepest soil boring,in March 1999. MTBE was <br /> also detected at 500 ug/L in groundwater samples collected at 29 feet bsg from soil boring <br /> � 1 i <br /> r <br />