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CLEAR MER <br /> Several commonly used chemical oxidants have been used for in-situ applications on petroleum <br /> hydrocarbons, including hydrogen peroxide, Fenton's Reagent (hydrogen peroxide with an iron <br /> catalyst frequently performed under acidic [low pH] conditions), activated sodium persulfate, <br /> and ozone catalyzed with hydrogen peroxide. Before a particular chemical oxidant is selected, <br /> choices of dosage, activators, pH adjustments, and other variables are determined by performing <br /> detailed bench tests in a laboratory with representative soil and groundwater from the site. In <br /> addition to determining the degradation rate for a particular oxidant at a given dosage, part of the <br /> purpose of the bench test is to evaluate whether any transition metals are released or become <br /> soluble by the introduction of a chemical oxidant. <br /> ruPre <br /> I <br /> f Y <br /> -:) roti r Lr_-_: 1 <br /> The above diagram illustrates injection of a chemical oxidant into groundwater. Chemical <br /> oxidants can also be injected into the unsaturated zone to treat hydrocarbons. <br /> TOTAL CONTAMINANT MASS CALCULATIONS <br /> An estimated mass of approximately 3,261 pounds, or 526 gallons, of TPH-g in soil will need to <br /> be remediated using the suggested technology. The estimated quantity of this residual mass was <br /> updated per the request of the SJCPHS-EHD and updated on the basis of the Site Conceptual <br /> Model prepared in 2009. These figures are only estimates based on existing sorbed-phase data <br /> and may range in excess of or below the actual mass due to variability of contaminant <br /> concentration in soil, limited data, and natural attenuation since the time that soil samples were <br /> collected_ Calculations with explanations and associated figures are provided in Attachment 4. <br /> Calculations of the mass in groundwater were not updated because of the large fluctuation of <br /> hydrocarbon concentrations between April 10, 2009, when the last calculation was made (April <br /> 2009, Site Conceptual Model Report), and the last groundwater monitoring event, on January 26, <br /> 2010. <br /> Floyd Barnes 5 Updated CAP <br /> ZB178 Update to CAP March 2010 <br />