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too ./ <br /> Harlin Knoll [EH] <br /> From: Ted Moise [Tmoise@eticeng.com] <br /> Sent: Tuesday, March 27, 2007 11:26 AM <br /> To Harlin Knoll [EH]; Nuel Henderson [EH];jbarton@waterboards.ca.gov <br /> Cc: Bryan campbell; Christa Marting; Deborah Hensley; Doug Oram; <br /> jennifer.c.sedlachek@exxonmobil.com <br /> Subject: 3942 -4444 North Pershing Avenue- RWQCB Meeting Follow UpData <br /> t <br /> 3942 Remediation <br /> Assessments.p... <br /> Representatives of the San Joaquin County Department of Environmental <br /> Health and Regional water Quality Control Board, Central Valley Region. <br /> As mentioned in the email dated 22 February 2007, the following <br /> site-specific information and supporting calculations for Former Exxon <br /> RS 7-3942, 4444 North Pershing Avenue , Stockton, California are <br /> attached in a PDF file to this email: <br /> • Estimated mass of petroleum hydrocarbons in the subsurface <br /> • Oxidant demand and treatment time estimate to evaluate the <br /> in-situ chemical oxidation (ISCO) pilot test conducted onsite during <br /> 2005 and 2006 <br /> • Evaluation of groundwater extraction as a remedial alternative <br /> for petroleum hydrocarbons in the subsurface. <br /> A description of these calculations is presented below. <br /> The approximate extent of the pilot test area (Section I) and the <br /> source area (Sections I, II, and III) are presented on the attached <br /> figure 2 (Petroleum Hydrocarbon Mass and ISCO Treatment Time Estimate) . <br /> Also presented on this figure is a summary of estimated mass in both the <br /> pilot test and source areas, as well as an estimate of the ISCO <br /> treatment time to address both the total hydrocarbon and natural oxidant <br /> demand in both the pilot test area and the source area. <br /> The detailed calculations of hydrocarbon mass estimate are presented in <br /> Table A (Petroleum Hydrocarbon Mass Estimate) . These calculations were <br /> based on the petroleum hydrocarbon distribution observed in soil. It is <br /> estimated that approximately 18,500 pound (lb) petroleum hydrocarbon <br /> mass is present in the subsurface. This does not account for the minor <br /> mass of dissolved-phase hydrocarbons or the entrapped/submerged <br /> liquid-phase hydrocarbon mass present, if any. <br /> These hydrocarbon mass estimates were then used to estimate ISCO <br /> treatment time. The treatment time estimate for stoichiometric oxidant <br /> demand is based on the theoretically required amount of ozone and <br /> hydrogen peroxide to destroy 1 lb mass of petroleum hydrocarbon (as <br /> octane equivalent) in the subsurface. The ISCO treatment time for <br /> Applied Process Technologies' PulseOx-100 injection unit (capacity - <br /> ozone Q 2 lb/day and hydrogen peroxide @ 16.5 lb/day) was estimated with <br /> respect to stoichiometric hydrocarbon oxidant demand for the pilot test <br /> area (Table B) , for the source area (Table C) . The results of these <br /> calculations are summarized on Figure 2 . <br /> Similarly, the treatment time estimate for site-specific oxidant demand <br /> was based on the results of oxidant demand (as high as 700 milligrams <br /> ozone per kilogram of soil) observed during bench-scale test conducted <br /> by Prima Environmental in 2005. This value is indicative of the natural <br /> or background oxidant demand in the subsurface. The ISCO treatment time <br /> for Applied Process Technologies' Pulseox-100 injection unit with <br /> 1 <br />