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respect to site-specific natal oxidant demand is presented %OTable D. <br /> The results of these calculations are summarized on Figure 2. As seen <br /> from the calculations, ISCO treatment time (ozone only) for natural <br /> oxidant demand is estimated to be approximately 5 years for the pilot <br /> test area and 12 years for the source area. <br /> The total ISCO treatment time is the addition of the hydrocarbon and <br /> natural oxidant demand. Safety factor ranging from 2 to 10 is typically <br /> applied to the stoichiometric estimate for the design of in-situ <br /> remedial technologies. <br /> Therefore, the total ISCO treatment time for the pilot test area ranges <br /> from 19 years (without safety factor) to as high as 145 years (with <br /> safety factor of 10) , and the source area treatment time ranges from 33 <br /> years (without safety factor) to as high as 217 years (with safety <br /> factor of 10) . <br /> Application of a groundwater extraction system was evaluated based on <br /> the estimated mass in the source area, expected phase-transfer rate, and <br /> expected groundwater extraction rate. The detailed calculations are <br /> provided in Table E (Groundwater Extraction System Evaluation) . Based <br /> on ETIC Engineering's past experience with the operation of <br /> groundwater extraction systems for remediation of petroleum hydrocarbons <br /> in the subsurface, a 18 phase-transfer rate is typically expected. A <br /> groundwater extraction rate of 10 gallons per minute was assumed for <br /> this calculation. As seen from the calculations, the estimated time to <br /> remove approximately 18,500 lb of petroleum hydrocarbon mass would <br /> require operation of groundwater extraction system for at least 145 <br /> years. <br /> Based on these assessments, along with the results of future drilling <br /> activities, a potential remedial alternative will be proposed under a <br /> separate cover. <br /> Please call if you have questions or need additional information. <br /> Thanks, <br /> Ted <br /> Ted Moise <br /> Senior Project Manager <br /> ETIC Engineering, Inc. <br /> 2285 Morello Avenue <br /> Pleasant Hill, CA 94523 <br /> Phone: (925) 602-4710 (X 23) <br /> Fax: (925) 602-4720 <br /> TMoise@eticeng.com <br /> 2 <br />