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r <br /> i <br /> • Estimates of the amount of hydrocarbon to be removed suggest that the majority of the mass is <br /> present in adsorbed phase within the soil Experience shows that vapor extraction is extremely <br /> effective in removing hydrocarbon in this condition Because the mass calculations indicate a <br /> substantial amount of hydrocarbon may be present in the soil, and the results of field testing <br /> indicate the initial production rates are high, a catalytic or thermal oxidizer is recommended <br /> The specific equipment should consist of a 200 scfin size catalytic burner that operates with <br /> natural gas as an auxiliary fuel source Prior to operation of this equipment, a permit will be <br /> obtained from the local Air Quality Management District This permit generally takes 3-6 <br /> months to obtain <br /> Groundwater Treatment System <br /> Remediation of the saturated zone will be accomplished by groundwater pumping and <br /> treatment in conjunction with simultaneous vapor extraction The primary benefit of <br /> groundwater pumping is to control the migration of the dissolved fraction of the <br /> contanrunation When combined with simultaneous vapor extraction, this method provides an <br /> effective means of removing hydrocarbon from the groundwater The groundwater pumping <br /> system will utilize 4 recovery wells to affect treatment Recovery wells TB7 and TBS, and <br /> monitoring wells MW3R and MW6 will be equipped with pneumatic pumps operated by a <br /> central system located in the treatment compound The water will be treated using liquid phase <br /> activated carbon and will be discharged to the storm sewer system This will require <br /> application for an NPDES permit which can take 6-12 months for processing <br /> i <br /> Page 10 <br />