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San Joaquin County <br /> pUiNP Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> Stockton, California 95202-3029 <br /> Robert MCClellon,RENS <br /> __ ___ - ------ Jeff Carruesco, REHS,RDI <br /> - - Kasey Foley,REHS <br /> • Cq T; .'.NSP Website: www.sjgov.org/0hd Linda Turkatte, REHS <br /> ciFod Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> December 9, 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#:T0607700815 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil and <br /> Ground Water Remediation Report- Third Quarter 2011 (Report) dated October 14, 2011, <br /> submitted by your consultant, Advanced GeoEnvironmental, Inc. (AGE). The Report details the <br /> operation and maintenance of the soil vapor extraction (SVE) and in-situ air sparge (IAS) <br /> remediation system at the site from June 2011 to September 2011. <br /> Approximately 1,200 pounds of Total Petroleum Hydrocarbons as gasoline (TPHg) vapor were <br /> calculated to have been extracted by the SVE system during this reporting period, with a total of <br /> 73,813 pounds estimated to have been removed from the site since the start of the SVE <br /> remediation in December 2009. Calculations included in the Report indicated that the daily <br /> extraction rate for TPHg has decreased from 433 pounds per day, to 5 pounds per day. Based <br /> on this data, your consultant estimated residual masses of TPHg and TPHd at the site at 768 <br /> pounds of TPHg and 9,757 pounds of TPHd. Original mass estimates were approximately <br /> 63,000 pounds of combined TPHg and TPHd present at the site in 2006. After remediation, the <br /> most current combined residual mass is calculated at 10,525 pounds. <br /> The EHD has also reviewed AGE's Confirmation Soil Boring and Soil-Vapor Intrusion <br /> Investigation Report, dated November 3, 2011, that was received on Geotracker November 7, <br /> 2011. This report covered the September 12, 2011 installation of two soil-vapor sampling points <br /> (P-22 and P-23) and the installation of three confirmation soil borings (P-19, P-20, and P-21). <br /> Laboratory data from the nine soil samples collected from the three confirmation soil borings <br /> indicated that TPHg was detected in each boring, with boring P-21 containing the highest <br /> concentration of each; 510 milligrams per kilogram (mg/kg) of TPHg and Total Petroleum <br /> Hydrocarbons as diesel (TPHd) at 2,500 mg/kg. Benzene, toluene, ethlybenzene, and xylene <br /> (BTEX) were also detected in boring P-21 at low concentrations. <br /> Laboratory data from samples collected from the two soil vapor points indicated that no <br /> petroleum hydrocarbons were detected. It was concluded in the report that the residual <br /> petroleum mass at the site does not pose a threat to the public or employees at the site. The <br /> EHD has learned that the soil gas samples were collected while the SVE system was in <br /> operation, potentially reducing soil gas hydrocarbon concentrations. Please re-evaluate the <br /> potential for vapor intrusion, accounting for the possible effects of active SVE during soil gas <br /> sample collection and report to the EHD by February 13, 2012 <br />