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�� 5l=GpR www secor corn <br /> tN7ERNATIONAL R 1i gave�9 gip <br /> SR INCC)RPORATED g78 8B1 0400 <br /> L•• V 9t8$BS-0430 f� <br /> i <br /> July 27, 2004 <br /> Mr Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> Unit IV—Site Mitigation <br /> 304 East Weber Avenue <br /> Stockton,CA 95202 <br /> RE Work Pian for Additional Site Assessment <br /> 7-Eleven Store##14117 <br /> 2725 Country Club Boulevard <br /> Stockton, California 95204-3937 <br /> SECOR Project No 77EI- 14117 04 0104 <br /> Dear Mr Infurna on behalf of 7- <br /> This work plan, prepared by SECOR international Incorporated (SECOR) <br /> s to <br /> neate <br /> Eleven Inc , proposes installing offsite monrtarrntgMtBE) and and it rt bu yl alcohoil (TBA) In <br /> vertical and lateral extent of methyl-tart-butyl a s, and advancing three <br /> and groundwater offsite from 7-Eleven Storethree offsite sol borings, <br /> and es installingiadvancing <br /> two <br /> soil a g Due to the <br /> offsite groundwater monitorPbo�nf soot the advancing <br /> site (Figures 1 and 2) <br /> cone penetrometer (CPT) g groundwater site <br /> to the site, the San Joaquin <br /> increasing concentrations of TBA in g has <br /> Coun Environmental Health Department caSbi3n contaminat an requested SECOR submit a <br /> workplan for additional assessment of hydro <br /> contamination in deep <br /> articular, this work plan will er evaluate thethe limits <br /> h drocahydrocarbon <br /> dissolved in 9 oundWatQ <br /> p p groundwater ansae and y <br /> portions of soil and 9 delineate the lateral extent of shallow contamination <br /> osed borings <br /> dowfigradient of the site, and (2) lame and <br /> and groundwater north and southeast fi the hetbo©daariesrof the hydrocarbon p <br /> and monitor wells will be used <br /> cutin of migration The proposed monitor wells will also be incorporated into the <br /> dire monitoring and sampling program <br /> regularly scheduled quarterly g <br /> asoline <br /> station The retail <br /> The <br /> site is an active 7-Eleven convenience sta o 10 0and 00-gallon undegasoline <br /> rground storage tanks <br /> station consists of one dispenser is}and an +N <br /> (USTs) (Figure 2) <br /> BACKGROUND The <br /> e site <br /> July 17, 1998,three 10,Ot70-gallon single-walled STS were removed from new 10.040-gallon doublehwalled steel <br /> on J y <br /> UST excavation was extended to the east, and diameter Schedule 4Q PVC conductor casing was <br /> US <br /> Ts were installed (Figure 2) The netanks were installed in a tank pit located east of <br /> the original UST locations One ten-inch diame <br /> stalled In the new UST pit between the new tanks for future installation of well MW-2 <br /> m <br /> Foie 7-11114117 WP for additional assessment(July 04)doc <br />