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In-Situ Chemical Oxidation Feasibility Study Work Plan BOULEVARD AUTOMOTIVE SERVICE 2151 Country Club Boulevard, Stockton, California 1.0. INTRODUCTION Advanced GeoEnviron mental, Inc (AGE) has prepared this In-Situ Chemical Oxidation Feasibility Study Work Plan for the site located at 2151 Country Club Boulevard, Stockton, CA(site). The work plan evaluates in-situ chemical oxidation (ISCO) remedial alternatives to mitigate residual adsorbed and dissolved petroleum hydrocarbon impact to soil and ground water at the above-referenced site. Included in the work plan are procedures for the performance of a limited field scale pilot test. The site and surrounding area are illustrated in Figure 1. On-site structures,soil borings,well locations and other features are illustrated in Figure 2. Well construction details are summarized in Table 1. Ground water elevation and analytical data is provided in Table 2. Historical "grab" ground water analytical data is summarized in Table 3. Soil analytical data is summarized in Table 4. 2.0. SITE REMEDIAL FEASABILITY STUDY HISTORY Between 28 and 30 March 2011, a dual phase extraction (DPE) pilot test was conducted at the site. The DPE pilot test consisted of utilizing a portable, 25-horsepower, oil-filled, liquid ring pump to simultaneously extract ground water and soil-vapor from on-site well DPE-1 (screened 10 to 25 feet bsg). During the three day pilot testing period a total of 19,000 gallons of petroleum-impacted ground water was removed from extraction well as part of the pilot study. Based on field and analytical results, AGE concluded that the ground water portion of the dual-phase extraction process was (1) successful at drawing back significantly impacted ground water downgradient of the former UST area, (2) successful at inducing a large ground water radius of influence, and (3) was successful at capturing highly impacted waters/NAPL in the source area. However,AGE concluded that dual phase extraction was not successful at lowering the water table enough to expose the submerged screen intervals in the surrounding observation wells. Detailed results of the DPE pilot test were summarized in the AGE-prepared, Dual Phase Extraction Pilot Study Report- May 2011, dated 20 May 2011. 3.0. ISCO REMEDIAL ALTERNATIVES Due to DPE's inability to lower the water table and inability to expose intervals of significantly"drowned"adsorbed petroleum hydrocarbon impact,AGE has recommended Ad.need GeoEnvimnmenlal,Inc.