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• SLOR INTERNATIONAL INCORPORATED <br /> 57 Lafayette Circle,2n°Floor w .Secorcom <br /> S E C O R Lafayette,CA 94549 <br /> 925-299-9300 TEL/925-299-9302 FM <br /> August 10, 2004 <br /> Mandeep Singh <br /> Geological Technics Inc. <br /> 1101 7th Street <br /> Modesto, CA 95354 <br /> OZONE SPARGING BENCHSCALE STUDY WORK PLAN FOR <br /> GEORGE'S SERVICE STATION <br /> 1600 DURHAM FERRY ROAD, TRACY, SAN JOAQUIM COUNTY <br /> Dear Mr. Singh: <br /> SECOR International Incorporated (SECOR) has prepared this Ozone Sparging Benchscale <br /> Study Work Plan (Work Plan) for the Central Valley Regional Water Quality Control Board <br /> (RWQCB) on behalf of Geological Technics Incorporated for George's Service Station located <br /> at 1600 Durham Ferry Road, Tracy, California. This Work Plan was prepared in response to <br /> your recent request. The study is intended to address concerns about the possible mobilization <br /> of general minerals in soils and the creation of degradation byproducts from the chemical <br /> oxidation of petroleum hydrocarbon and fuel oxygenates. The study has been designed to <br /> address the RWQCB concerns and provide an evaluation of treatment effectiveness in <br /> saturated soil. <br /> OBJECTIVE <br /> The objective of the study is to evaluate the efficiency of ozone sparging on methyl tertbutyl <br /> ether (MTBE), benzene/toluene/ethylbenzene/xylene (BTEX) and total petroleum hydrocarbons <br /> in the gasoline range (TPHg). The specific objectives requested by the RWQCB are listed <br /> below with SECOR's planned method for evaluating the individual requests: <br /> 1) Evaluate the stoichiometry or chemical equations with concentrations in moles for the <br /> reaction between the soil and groundwater and the injected ozone. <br /> SECOR proposes conducting a mass balance using saturated site soil and groundwater, to <br /> evaluate the effectiveness of treatment. SECOR will also present balanced chemical <br /> equations for the reaction of constituents of concern and general minerals of concern with <br /> ozone in the subsequent Benchscale Study Report where possible. <br /> 2) Provide results of a leachability test on native soils, to determine the potential effects from <br /> the ozone injection. General minerals analyses should be conducted to evaluate if naturally <br /> occurring minerals will move into solution as a result of the ozone injection. The following <br /> general mineral suite should be evaluated: aluminum, antimony, arsenic, barium, beryllium, <br /> cadmium, calcium, chromium (III and VI), cobalt, copper, iron, lead, magnesium, <br /> manganese, mercury, molybdenum, nickel, potassium, selenium, silver, sodium, thallium, <br /> tungsten, vanadium, and zinc. <br /> 1 <br />