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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 Robert McClellon,REHS <br /> ..�," Jeff Carruesco, REHS,RDI <br /> • r. .p Kasey Foley, REHS (p1' <br /> a ........ Website: www.sjgov.org/ehd R i <br /> �rFOR Phone: (209)468-3420 Linda Turkatte, REHS yi <br /> Fax: (209) 464-0138 <br /> August 17, 2011 <br /> Mila S. Padilla Trust <br /> DIK Enterprises <br /> P. O. Box 1036 <br /> Tracy, CA 95376 <br /> Subject: Three B's Truck Plaza RO#: 0550 <br /> 14749 N. Thornton Rd. CUF#: 12992 <br /> Lodi, CA 95242 Global iD#30607700815 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work <br /> Plan Addendum — June 2011 (Plan) and Proposed Soil Vapor Extraction Rebound <br /> Response Test — July 25, 2011, (Test) submitted by your consultant, Advanced <br /> GeoEnvironmental, Inc. (AGE). The Plan proposes the installation of three combination <br /> soil vapor sampling points/confirmation soil borings in and near the former underground <br /> storage tank (UST) location and the Test proposes turning the soil vapor extraction <br /> system off for 30 days, restarting the system, collecting air samples from the influent <br /> and effluent ports for laboratory analysis for petroleum constituents and submitting a <br /> report of findings to the EHD. <br /> The purpose for collecting the soil gas samples at this contaminated UST site is to <br /> ascertain if contaminant vapor from the impacted soil or groundwater has migrated <br /> toward the building where it may pose a threat to human health. By sampling in the <br /> former UST pit, as proposed in the plan, and not near the building/store located further <br /> away, the EHD is concerned that the data obtained may not represent the actual <br /> potential threat to the public in the building, although a sample from the potential source <br /> area may represent the maximum potential for vapor intrusion. The EHD considers it <br /> direct and appropriate to collect the samples near the onsite building and in any area <br /> designated for a new building to be constructed. <br /> Also, the EHD is concerned that installing vapor probes and collecting soil gas samples <br /> from partially backfilled soil confirmation borings may not be an adequate approach for <br /> a vapor intrusion investigation. By collecting soil gas samples from a deep bore hole <br /> that targeted historically more intensely contaminated zones shallow soil may be <br /> exposed to cross contamination from contaminant vapor or impacted soil, if any, <br /> encountered at depth that may migrate upward through the borehole. <br /> Previous investigations have identified soil underlying the dispenser islands south of the <br /> building and the former UST pit west of the building to have contained most of the <br /> 14749 Thornton Final SV& Conf-SB WP CML 8-17-11 <br />