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1 <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K Heran,R E H S Carl Borgman,R E H S <br /> 304 East Weber Avenue, Third Floor' Mike Huggins,R E kl S.R D t { Director gg <br /> Al Olsen,R E H 5 Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> • o a�P • Progr am Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> 4Cf FOR Laurie A Cotulla,R E H 5 Robert McClellon,R E H S <br />' Program Manager FaX (209} 464-0138 Mark Barcellos,R E H S <br /> KEN HILLIARD DEC 3 v 2003 <br />' 7-ELEVEN INC <br /> PO BOX 711 <br /> DALLAS TX 75221-0711 <br /> RE 7-Eleven Store#32262 SITE CODE 1505 <br />' 2360 Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department(SJCIEHD)has reviewed "Site Assessment <br />' Report"dated December 12, 2003 that was submitted on your behalf by SECOR International <br /> Incorporated (SECOR)and has the following comments <br /> The report documents a site investigation that took place in October 2003 when six groundwater <br /> t monitoring wells were installed onsite Five of the wells were installed to a total depth of 17 feet below <br /> surface grade(bsg)to investigate the lateral extent of the shallow groundwater contamination, one <br /> well was installed with a conductor casing set to 32 feet bsg and a short discrete screen interval set <br /> from 46-51 feet bsg to investigate the vertical extent of the contamination Soil samples for analysis <br /> were collected during the drilling of the bon►igs for the wells,the welts were developed and sampled <br /> on October 24, 2003,without notification to SJCIEHD <br />' Analytical results from the soil and groundwater samples collected during this investigation indicate <br /> that the lateral and vertical extent of both the sod and groundwater contamination has not been <br /> defined The extremely high concentration of methyl tertiary butyl ether in shallow down-gradient well <br />' MW-5 should be addressed with interim remediation <br /> The report did not include a Site Conceptual Model(SCM),or recommendations for further work <br /> Please submit a work plan to continue the investigation of the lateral and vertical extent of the <br />' contamination at this site In addition, submit a work plan for interim remediation to minimize migration <br /> of contamination offsite The report states"future remediation lines,which consist of two 2-inch <br /> diameter and one 1-inch diameter PVC lines,were stubbed up in the well box for TP-1 The <br /> remediation piping was installed along the west side of the UST's, extending approximately 90 feet <br /> I south of TP-1 and stubbed up adjacent to the air/water service area" Please explain what the exact <br /> purpose of these lines is, and what types of remediation are they are intended to perform <br /> The work plans and SCM are due for submittal no later than February 27, 2004 If you have any <br />' questions please call Lori Duncan at(209)468-0337 <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> urvV�� Cil t 1000 <br /> ,v-�/t � <br /> Lon Duncan, Senior REHS Nuel C Henderson,Jr, RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc James Barton, CVRWQCB <br /> Brian Carey, SECOR DEC 3 1 2003 <br /> BY .................... <br />