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Ground Water Remediation Feasibility Work Plan <br /> STALLWORTH AUTO SALES <br /> 602 North California Street, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Gary Stallworth, Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this Ground Water Remediation Feasability Study Work Plan for the property <br /> located at 602 North California Street, Stockton, California (site). The report evaluates <br /> remedial technologies to mitigate residual petroleum hydrocarbon impact to"drowned"soil <br /> and ground water at the above-referenced site. Included in the enclosed report are <br /> procedures for the performance of an in-situ chemical oxidation (ISCO) pilot test. The site <br /> and surrounding area are illustrated in Figure 1. On-site structures, soil borings, well <br /> locations and other features are illustrated in Figure 2. Ground water elevation and <br /> analytical data is provided in Tables 1 and 2, respectively. Soil analytical data is <br /> summarized in Table 3. A summary of historical site background information is included <br /> in Appendix A. <br /> 2.0. SITE REMEDIAL HISTORY <br /> Between 14 September 2010 (start-up) and 22 August 2011 , a soil vapor extraction (SVE) <br /> remediation system was operated at the site, utilizing a natural gas-fired, thermal/catalytic <br /> oxidizer SVE system to selectively apply an induced vacuum to wells VW-1, VW-2, VW-3 <br /> and VW-4. <br /> Between 22 August and 19 October 2011 the SVE system was temporarily shut down to <br /> perform an SVE rebound test. On 19 October 2011 the SVE system was restarted and <br /> operated for a period of 24-hours to evaluate influent vapor concentrations and to further <br /> determine the feasibility of future vadose zone remediation at the site. On 20 October <br /> 2011, influent and effluent vapor samples were collected and the system was shut down. <br /> Based on influent sampling results, the on-site SVE system has removed an estimated <br /> 10,201 pounds, equivalent to 1 ,632 gallons of adsorbed petroleum hydrocarbons from <br /> vadose zone soils at the site. <br /> A detailed summary of remedial operations, which includes historical remedial operational <br /> parameters, analytical data and mass/volume removal calculations is summarized in the <br /> AGE-prepared, Soil Vapor Extraction Remediation Report- Third Quarter 2011, dated 28 <br /> October 2011 . A report documenting the results of the 24-hour SVE rebound test is <br /> forthcoming. <br /> Advanced GeoEnvironmental,Inc. <br />