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In-Situ Chemical Oxidation Pilot Study Report STALLWORTH AUTO SALES 602 North California Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Gary Stallworth, Advanced GeoEnvironmental, Inc. (AGE) has prepared this In-Situ Chemical Oxidation Pilot Study Report for the property located at 602 North California Street, Stockton, California (site). The pilot study was conducted to evaluate the effects of chemical oxidation to hydrocarbon impacted groundwater at the site. During the pilot study, AGE performed the following scope of work: four consecutive weeks of in-situ chemical oxidation (ISCO) pilot injections in wells MW-1A and MW-8 and monitoring of field parameters in selected wells; two progress sampling events during the injections; four post-injection monitoring and sampling events; and preparation of this report. The site and surrounding area are illustrated in Figure 1. Structures, borings and well locations are illustrated in Figure 2. Groundwater monitoring results and well parameter readings collected during baseline, progress and post-ISCO monitoring events are summarized in Tables 1 through 5. 2.0. DESCRIPTION OF REMEDIAL TECHNOLOGY Advanced Oxidation Processes (AOP) refers to a set of treatment options used to remediate organic and inorganic wastes from water. In general, four common ADP's are used in industry to remediate hydrocarbons in soil and groundwater: hydrogen peroxide, ozone, RegenOxTA° and Fenton's Reagent.AOP are commonly used to remediate gasoline from underground fuel tank leaks and to treat waste water. The most predominant radical found in the reaction is the hydroxyl radical. The hydroxyl ion generally grabs hydrogen atoms from the organic molecules in contaminated waters and causes organic molecules to become unstable and eventually breakdown. The end product of these reactions is generally small amounts of mineral acid from halogens, nitrogen or sulfur present in soil in groundwater, bicarbonate and water. For this in-situ chemical oxidation (ISCO) pilot study, mixtures of 5% hydrogen peroxide and 5% hydrogen peroxide mixed with muriatic acid (Modified Fenton's Reagent) were utilized at the site as outlined in the AGE-prepared, In-situ Chemical Oxidation Pilot Test Work Plan, dated 31 October 2011. 3.0. PROCEDURES Pre- and post-ISCO pilot test activities included the following scopes of work: Advanced GeoEnvironmental,Inc.