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N • A solid oxidant demand (SOD, g w) test in the composite soil sample will be j performed using permanganate as the oxidant. The SODp..gw is I representative of the solid oxygen demand (SOD) of the soil. The SODpe.g�w is a test designed by Carus Chemical Company and is performed in their laboratory. For the aqueous portion of oxygen demand, the chemical oxygen demand (COD) and the 5-day biological oxygen demand (BODS) of the groundwater will be analyzed using EPA Methods SM5220D and SM5210B, respectively. • Total Dissolved Solids (TDS) by EPA Method 160. 1 • Selected metals in the groundwater will be analyzed before and after the bench test, including arsenic, bromide, cadmium, chromium, lead, and mercury. PROPOSED BENCH TESTING METHODS, Modified Fenton's treatment of the composite soil sample will consist of four process conditions: 1) A range of hydrogen peroxide concentrations with no pH adjustment; 2) A range of hydrogen peroxide concentrations with pH adjustment to 3 (with catalysis of the hydrogen peroxide by the naturally-occurring transition metals) such as iron, 3) A range of hydrogen peroxide concentrations with an addition of 200 mg/L of iron(flM) . This test will be performed at pH 3 ; and 4) A range of hydrogen peroxide concentrations with no pH adjustment but the addition of a proprietary iron-nitriloacefic acid (NTA) chelate or other proprietary chelating agent. ) All treatability studies will use approximately 10 g of the soil cuttings, 2 mL of groundwater, and 2 mL of reagents. Control samples using deionized water will be used. Upon addition of hydrogen peroxide and any other reagents (e.g., acid, iron[Il] sulfate, or iron-chelate), tbe-slurries-wilLhe-mixed-using_a vortex-to-ensure homogeneity of-the reagents. The reactions will be allowed to proceed until the hydrogen peroxide is consumed (24 hours) . The entire vial contents will then be extracted with methylene chloride and analyzed for residual hydrocarbons by gas chromatography/flame ionization detection. EQUIPMENT Total petroleum hydrocarbon concentrations will be quantified using an EPA Modified 8015 methodology on a Hewlett Packard 5890A gas chromatograph with a flame ionization detector (FID) and a 15-m D13-1 capillary column. Estimated chromatographic conditions will include an initial oven temperature of approximately 40 °C, program rate of 10 °C/min, final temperature of 140 °C, injector temperature of 200 °C, and detector temperature of 220 °C. DECOMPOSITION OF TREATMENT CHEMICALS The decomposition of hydrogen peroxide will be monitored in the samples to determine the length of time in hours that it takes for most of the hydrogen peroxide to decompose . This information will be useful in planning where the injection ports or injection wells should be placed so that groundwater travel time between injection locations is no greater i, 4