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2 REMEDIAL ALTERNATIVES <br /> Philip performed a focused technology evaluation regarding two remedial alternatives <br /> for this Site Of the remedial technologies available, these two active technologies <br /> seemed best suited to the specific set of conditions currently encountered Applicable <br /> technologies include infection of an oxygen releasing compound, and air sparging <br /> combined with soil vapor extraction(venting) Comparisons of these options were <br /> made based on their effectiveness, engineering feasibility, and cost of <br /> implementation <br /> 2.1 Effectiveness <br /> I Effectiveness was evaluated based on the amount of oxygen that might be <br /> introduced and the area coverage reasonably expected to be obtainable with <br /> each approach <br /> Oxygen releasing compounds typically introduces oxygen to the subsurface <br /> through the dissociation of magnesium oxide <br /> M902+H2O ==> 1/202T +Mg(011)2� <br /> Based on this stochiometne relationship and the molecular weights of the <br /> respective elements, it follows that approximately 16 lbs of 02 could be <br /> released for every 56 lbs of pure Mg02 that completely dissociates Oxygen <br /> releasing compounds usually takes about one year to completely dissociate in <br /> groundwater Theoretically, if 1,000 lbs of oxygen releasing compounds were <br /> infected into the subsurface, up to 290 lbs of oxygen could potentially be <br /> released if there is no impedance to the dissociation Past experience indicates <br /> that several applications of oxygen releasing compounds at this Site would <br /> likely be required to effectively reduce existing contaminant concentrations to <br /> cleanup objectives <br /> Air sparging introduces oxygen to the subsurface by injecting compressed air <br /> Dry air is approximately 21% oxygen, 78%nitrogen, and weighs about 0 0808 <br /> lbs/ft3 Based on the molecular weight of the components of air, the ratios of <br /> the components, and the average density of air, 1t follows that approximately - <br /> 0 019 lbs of oxygen is contained in every standard cubic foot of air For <br /> example, if an air sparging system were infecting 10 standard cubic feet per <br /> minute (scfrn) of air for one year, approximately 99,900 lbs of oxygen would <br /> Ibe released in the subsurface <br /> Air sparging at a rate of 10 sefin per day releases almost as much oxygen as <br /> 1000 lbs of magnesium oxide in a year Therefore, air sparging is expected to <br /> be more effective introducing oxygen than oxygen releasing compounds <br /> 7 <br /> Pilot Testing Work Plan <br /> 1717 South Center Street-Stockton,California <br /> Prepared by Philip Services Corp <br /> 1\NAOIN520191r1SERStiEM'tiL24001321121382EG\Pmje=\StockCentlp-lotwstpla dot July 23,2002 <br />