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PUBLIC H ALTH SERVI 'ES ' <br /> o� <br /> SAN JOAQUIN COUNTY Q <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer ' <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 \'Fear <br /> 209/468-3420 <br /> PHILLIP ELDER/JAY QADDOURA AUG 0 9 2000 <br /> RAINWATER CARWASH <br /> 420 W YOSEMITE <br /> MANTECA CA 95337 <br /> RE: RAINWATER CARWASH SITE CODE: 231458 <br /> 420 W YOSEMITE AVE <br /> MANTECACA 95337 <br /> Wrnk P1anAdda7dima Augtst 1999 dated August 10, 1999 (the work plan) prepared by <br /> Advanced GeoEnvironmental,Inc. (AGE) was approved by San Joaquin CountyPublic <br /> Health Services,Environmental Health Division (PHS/EHD) on August 25, 1999. The <br /> work plan proposed the installation of seven monitoring wells,in-situ air sparging (IAS) and <br /> soil vapor extraction (SVE) wells,2000 feet radius well receptor survey,a pump test,an <br /> IAS/SVE feasibilitypilot study, and a Corrective Action Plan (CAP) upon the completion of <br /> the feasibility studies. <br /> Five of the seven proposed monitoring wells were installed in June/July 2000,while the two <br /> remaining monitoring wells were postponed due to overhead and underground obstruction. <br /> Due to the presence of porous soils in the area and the high concentration of Methyl Butyl <br /> telt Ether(MTBE) in the groundwater samples,characterization of hydro-geological <br /> conditions at the site and a comprehensive 2000 feet radius well receptor survey are needed <br /> for strategic placement of additional monitor wells.In a telephone conversation on August <br /> 4,2000,PHS/EHD agreed with AGE's recommendation to delay the installation of the two <br /> remaining monitoring wells until cone-penetration testing (CPT) drilling to characterize the <br /> geology has been performed. Submit the 2000 feet radius well survey(which includes a <br /> door-to-door physical search for wells) to PHS/EHD by August 31,2000,and the <br /> preliminary investigation report/initial quarterly monitoring report of the above-mentioned <br /> well installation event by September 15,2000. <br /> Submit a workplan for CPT characterization and sampling by September 20,2000. Work <br /> should commence by September 30,2000. <br /> If you have any question,please contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,RENS,Director <br /> Environmental Health Division <br /> Jeffrey Wong,REHS MargaareYLagorrio,REV <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB,Central Valley Region-Marry Hartzell <br /> c: Advanced GeoEnvironmental,Inc.- Tim Cuellar <br /> A Division of San Joaquin County Health Care Services <br />