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fir✓ <br /> San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department` ASSISTANT DIRECTOR <br /> oG 600 East Main Street Laurie Cotulla,REHS <br /> two��rnipl& s Stockton, California 95202-3��9 PROGRAM COORDINATORS <br /> .;.{ Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> cq�iFOR �P Website: www.Sjgov.Org/ehd <br /> Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> 1 KEN HILLIARD <br /> 7-ELEVEN <br /> P.O. BOX 711 <br /> DALLAS, TX.95221-0711 <br /> RE: 7-ELEVEN STORE 21756 LOP SITE CODE: 1369 <br /> 853 E.Yosemite Ave. <br /> { <br /> Manteca,CA <br /> f <br /> WORK PLAN: Confirmation Soil and Groundwater Sampling <br /> DATED: July 27,2007 <br /> PREPARED BY: Secor <br /> APPROVED: rl <br /> DT5APPKQVED: <br /> DED: Submit by: <br /> 1 ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25299.37,subd(c)(3)]: <br /> 1. One additional confirmation soil boring will be installed down-gradient to further define the extent of soil and <br /> groundwater contamination. <br /> 2. Discrete soil and groundwater samplings will be collected to further define the extent of soil and <br /> groundwater contamination. <br /> 3. Samples collected will be analyzed for total petroleum hydrocarbon as gasoline, BTEX, and oxygenate <br /> components and additives(including but not limited to MTBE)and reported to EHD and the CVRWQCB for <br /> review and comment. <br /> COMMENTS AND CONDITIONS: <br /> 1. EHD permits must be obtained prior to completing the boring. <br /> 2. In addition,the soil sample results from the site should be compared to the San Francisco Bay Regional <br /> Water Quality Control'Board (SFBRWQCB)Environmental Screening Levels(ESL's); If any soil sample- <br /> result <br /> ample result exceeds the SFBRWQCB ESL's,then additional data or justification must be provided to ensure all <br /> human health risks have been addressed. For example,the soil sample collected at 20 feet bsg from MW2 <br /> had 13.5 mg/kg of MTBE and the SFBRWQCB Tier 1 Environmental Screening Levels Surfer shows a limit <br /> of 5.6 mg/kg for vapor emissions to indoor air,so further data or';justification would be necessary to address <br /> the concern of vapor emission to indoor air currently or in the future. Please refer to EHD correspondence <br /> address to 7-.Eleven dated June 19,2007 for guidance. <br /> 3. Work must be completed by October 15,2007 and reports submitted to EHD and CVRWQCB for evaluation <br /> by DecembeFl, 2007. <br /> DATED t1 DI BY <br /> i <br /> Harlin Knoll, Senior REHS(209)468-3442 <br /> Cc:Secor <br /> i <br /> 1 <br />