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San Joaquin County <br />OPpUIN Environmental Health Department DIRECTOR <br />600 East Main Street Donna Heron, REHS <br />Stockton, California 95202-3029 PROGRAM COORDINATORS <br />3. Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Website: www.sjgov.org/ehd Kasey Foley, REDS <br />F o Phone: (209) 468-3420 Linda Turkatte, REH5 <br />Fax: (209) 464-0138 <br />January 27, 2012 <br />Ultramar Inc. <br />Mr. C. Shay Wideman <br />685 W. Third Street <br />Hanford, CA 93230 <br />Sayed & Zakia Abdelwahed <br />740 W. Oak Street <br />STOCKTON CA 95203 <br />Subject: ZE Auto Repair (Ultramar No. 13792) Site Code_ 1335 <br />2255 S. Airport Way, Stockton, CA 95206 <br />The San Joaquin County Environmental Health Department's (EHD) Local Oversight Program <br />(LOP) has received and reviewed Groundwater Monitoring/Remediation Report, Fourth Quarter <br />2011 (Report), dated January, 12, 2012, prepared by your consultant Horizon Environmental Inc. <br />submitted on your behalf. <br />The Report contains monitoring and sampling data from five on-site monitoring wells (MWs) and <br />four on-site vapor wells. Ground water contaminant concentrations are either stable or declining <br />in all the MWs except for MW -1 which is located on-site in the source area. Soil vapor sample <br />results from the remedial wells continue to decline. <br />Ground water contamination in the area of MW -1 needs to be further mitigated. EHD agrees <br />with Horizon's recommendations to continue soil vapor extraction and insitu air sparging <br />(SVEIIAS) utilizing granular activated carbon and to enhance/modify the existing corrective <br />action plan (CAP) by implementing another remedial technology to accelerate the time for <br />cleanup. The SVEIIAS remediation effectiveness will be reevaluated at the end of the first <br />quarter of 2012. <br />Horizon's recommendation is to submit a work plan (WP) to over -bore MW -1 and install a larger <br />dual phase extraction (DPE) well to enhance soil and ground water remediation in the on-site <br />source area. Please prepare and submit a WP and an EHD Well Permit Application by March <br />30,-2012, to destroy MW -1 and install the DPE well. <br />Monitoring and sampling of groundwater and soil vapor must continue during and after the <br />remedial action. Corrective action must continue until the EHD determines that no further action <br />is required. <br />According to the current property owner, Mr. Abdelwahed, he is considering expanding the <br />existing building and installing new USTs. An indoor vapor intrusion evaluation has not been <br />conducted for this site and this should be completed before any buildings are constructed. <br />