Laserfiche WebLink
tt <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY unitSupervtsors <br /> • "iii oG <br /> Uanna K Heran,R E Carl Borgman,R E H 5 <br /> a �-t N S 304 East Weber Avenue,Third Floor Mike Huggins,R E H S ,R D l <br /> a 4 Director <br /> At Olsen,R E x s Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> • `P• Progr am Manager Telephone (209) 468-3420 Margaret Lagono,R E H S <br /> arceilos,Laurie A Cotulla,R.E H s Fax (209) 464-0138 Robert ellR E fI S <br /> Progi am Manager Mark BarcR E H S <br /> KEN HILLIARD DEC 3 0 Z003 <br /> 7-ELEVEN INC <br /> PO BOX 711 <br /> DALLAS TX 75221-0711 <br /> RE 7-Eleven Store#32262 SITE CODE 1506 <br /> 2360 Grant Line Road <br /> Tracy CA 95376 <br /> eviewed oSite <br /> San Joaquin County Environmental Health <br /> December 12, 2003 that was Osubmitt d on youepartment r behalf byrSECOR Inte national meat <br /> Repott <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 /> 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 borings for the wells,the wells 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 methyi 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 pian 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 /> south of P e adjacent to <br /> the air/water service <br /> explain what the exact <br /> purpose of lines sand what types of remediation are they e�ntendedoperfo <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 /> Lon Duncan, Senior REHS Nuel C Henderson, Jr ., RG <br /> LLOP/Site Mitigation Unit IV <br /> OP/Site Mitigation Unit IV <br /> cc James Barton, CVRWQCB DEC 3 2003 <br /> Brian Carey, SECOR <br /> BY:.------------------------ <br />