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San Joaquin County <br /> cEnvironmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> 600 East Main Street <br /> a: PROGRAM COORDINATORS <br /> U): :� Stockton, California 95202-3029Robert McClellon, REHS <br /> • Jeff Carruesco, REHS, RDI <br /> Kasey <br /> Website: www.sjgov.org/ehd Linda Foley, RENS <br /> Linda Turkatte, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> January 14, 2011 <br /> Mr. Weldon Church <br /> 1958 Yosemite Road <br /> Berkeley, California 94707 <br /> Subject: Weldon Church Property <br /> 104 West Beverly Place <br /> Tracy, California 95376 <br /> Dear Mr. Church: <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Soil Vapor <br /> Investigation Report, dated 02 November 2010, and Monitoring Well Installation & Aquifer <br /> Volume Test Report, dated 08 December 2010, both submitted by your consulting firm, <br /> Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. By <br /> letters dated 23 December 2008, and 11 May 2010, the EHD had conditionally approved <br /> Soil Vapor Survey Work Plan Addendum — October 2008, dated 24 October 2008, and In- <br /> situ Chemical Oxidation Pilot Test Work Plan Addendum, dated 08 April 2010, respectively. <br /> Results from the soil vapor investigation indicated high concentrations of total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g), benzene, and ethylbenzene were present in <br /> the soil gas samples that exceeded the Environmental Screening Levels (ESLs) established <br /> by the San Francisco Bay Regional Water Quality Control Board, and benzene <br /> concentrations that exceeded the California Human Health Screening Levels (CHHSLs) <br /> published by the Office of Environmental Health Hazard Assessment, California <br /> Environmental Protection Agency. Based on these findings, the EHD directs that additional <br /> soil gas samples be collected from the five temporary soil vapor sampling points (V-1 <br /> through V-5) located adjacent to the residential dwelling during the first quarters 2011; and a <br /> work plan be submitted to the EHD by 28 February 2011 to collect air samples in the crawl <br /> space beneath the residential dwelling at this site. The EHD also directs that a Human <br /> Health Risk Assessment (HHRH) and a site conceptual model be submitted to this <br /> department by 30 March 2011. <br /> Results reported by AGE in Monitoring Well Installation & Aquifer Volume Test Report, <br /> indicate that significant concentrations of TPH-g and benzene, toluene, ethylbenzene and <br /> total xylenes (BTEX) were detected in soil samples collected from monitoring well MW-8 at 7 <br /> and 10 feet below surface grade (bsg) with lower concentrations 12, 16, and 22 feet bsg. <br /> Also, results from the two aquifer volume tests indicate that injections into the fine-grain <br /> lithology from approximately 5 to 12 feet bsg, and injections into the course-grained lithology <br />