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- <br /> Lr <br /> San Joaquin County artrFcroR <br /> Q ' Environmental Health Department as8/sra°o°"'"°cyr`EM <br /> C <br /> K 500 East Main Straet taurkt%a��Roh ft i;croa <br /> ENS i <br /> Stockton,California 85202-3029 <br /> ntrcownre cooaotvAroRs <br /> Call L. s c �; Webslto:www,sJgovorMlshd r nro tacsmo.REM,Rat <br /> Phons: (209)468.3420 Me,9aret Lagofio,REN$ <br /> Fax: (209)46:1.0138 eNcanuscao RENa Rol <br /> September 23,2008 xa�ar roar RENS <br /> 7 <br /> Mr.Michael Barvelot <br /> Qnik Stop Markets,Incorporated <br /> 4567 Enterprise Street <br /> Fremont,California 94538 <br /> V <br /> Subject: ,Quik Stop Market No.132 <br /> 3555 West Hammer Lane <br /> Stockton,California 95209 <br /> The San Joaquin County Environmental Health Department(MM)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(bag);however,since March 1996,depth-tc-groundwstermeasurements have <br /> been reported between approximately 7 and 11,5 feet hag. of the eighi remaining <br /> monitoring wells at this site,only MW-5,screened between 9 and 19 feet bsg,is screened <br /> across the first watcr-bearing zone identified at sppmximately 5 to 10 feet bsg. Mon toring <br /> ed bsg MW-4 is <br /> wells MW-2, MW-3, and MW-8 are screened between 20 and 30 f <br /> screened between 16.5 end 26.5 feat 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 mothyi tertiary-butyl ether(MTBE)concentrations were not <br /> �. reported in groundwater samples until March 1996, approximately five•and-a--half years 1 <br /> after the initial petroleum hydrocarbon leak was detected. The MID is concerned the <br /> MTBE plume may have migrated laterally in the permeable sand unit at appioximately 10 <br /> a. feet bag, This hypothesis is supported by high concentrations of.MTBE reported fn <br /> groundwater samples collected from soil boring SE-1 at 10 feet bag in July 2001,and in <br /> groundwater samples collected from MW-5 during the quarterly monitoring events. The } <br /> lateral extent of petroleum hydrocarbon contamination-in the first water-bearing gone must I <br /> ` be addressed <br /> In addition,MTBE was detected at 39 micrograms per liter m ! <br /> collected at 42 feet bag from ATC-5,the deepest sil boring,in gcouhdwater samples <br /> g P g,in March 1999. MTBE was ' <br /> s also detected at 500 ug/L in groundwater samples collected nt 29 feet bsg from soil boring <br /> I <br />