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r <br /> San Joaquin County DIRECTOR <br /> POD , N Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> r y 600 East Main Street Laurie Cotulla, REHS <br /> Ni (•} '� Stockton , California 95202-3029 PROGRAM COORDINATORS <br /> Carl Bergman, REHS <br /> Mike Huggins, REHS, RDI <br /> • C4 < / Fo .Z • Website: www.s/govorg/ehd Margaret Lagoro, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax: (209) 464=0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> NOV 062007 <br /> GARY STALLWORTH LEWIS STALLWORTH <br /> 602 CALIFORNIA STREET 1036 BURKETTE AVE <br /> STOCKTON CA 95202 STOCKTON CA 95205 <br /> RE : Stallworth Auto Sales SITE CODE : 2486 <br /> 602 California Street <br /> Stockton CA 95202 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Soil <br /> Vapor Extraction Pilot Test Report (Report) dated September 27 , 2007 , submitted on <br /> your behalf by Advanced GeoEnvironmental , Inc. (AGE ) and has the following <br /> comments . <br /> The Report documents two soil vapor extraction (SVE ) pilot tests conducted at your <br /> site in July 2007 . Analytical results of vapor samples collected during the two tests <br /> reported high concentrations of petroleum hydrocarbons . Based on the results of the <br /> test AGE calculated a projected radius of influence of approximately 24 feet in each <br /> test zone . <br /> In the Report AGE concludes that SVE could be an effective remedial alternative for <br /> the vadose zone soil contamination remaining at this site. However, they do not <br /> recommend installation of a permanent SVE system . Instead AGE proposes to <br /> conduct a dual phase extraction (DPE) pilot test on MWAA and VW- 1 . In <br /> conversation with AGE they explained that the reason they proposed DPE is to target <br /> soil contamination that is submerged near the top of the water table . SVE targets <br /> vadose zone soil contamination . DPE works by extracting vapor and groundwater <br /> from the extraction wells , which may lower the water table and expose more of the <br /> contaminated soil to removal by SVE . In essence , the two methods, groundwater <br /> extraction and vapor extraction , would work in conjunction with each other to <br /> remediate both shallow and submerged soil contamination . In addition , groundwater <br /> extraction may aid in remediation of the shallow groundwater contamination . <br /> SJC/EHD has previously directed submittal of a feasibility study to target remediation <br /> of the groundwater contamination . SJC/EHD has not received a technical evaluation <br /> of the potential efficacy of groundwater extraction to address impacted groundwater <br /> or lower groundwater elevation . Per California Code of Regulations, Title 23 , <br /> Chapter 16 , responsible parties of contaminated sites must conduct a feasibility study <br />