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Dual Phase Extraction Site Remediation System Summary <br /> For 701 E. Charter Way, Stockton, California <br /> Dual-phase extraction (DPE), variously known as multi-phase extraction, <br /> vacuum-enhanced extraction, or bioslurping, is a technology that uses a high <br /> vacuum system to simultaneously remove contaminated ground water and soil <br /> vapor from the subsurface. Once above ground, extracted liquids are treated <br /> (cleaned) and discharged under permit into the City of Stockton sanitary sewer <br /> system; treated vapor is discharged under permit into the atmosphere. <br /> The DPE system will be located within a gated enclosure having an approximate <br /> area of 10 feet by 10 feet, to be located immediately south of the Spirit Gas <br /> Station mini-mart store at 701 East Charter Way, Stockton. An exhaust stack will <br /> protrude from the enclosure to a height of 13 feet above the ground. The DPE <br /> system is noise-rated at 75 decibels at a distance of 15 feet, reported to be <br /> comparable to the sound of a vacuum cleaner or an average radio. <br /> Source: <br /> Chapter XI of OUST's publication: How to Evaluate Alternative Cleanup <br /> Technologies for Underground Storage Tank Sites: A Guide for Corrective <br /> Action Plan Reviewers. (EPA 510-8-95-007). <br /> www.epa.gov/swerust1!pubs/tum chll .pdf <br /> Executive Summary: <br /> Interim Remediation Work Plan - June 2008 <br /> SUPER CENTER MART <br /> 701 East Charter Way, Stockton, California <br /> Advanced GeoEnvironmental, Inc. (AGE) has prepared Interim Remediation <br /> Work Plan for 701 East Charter Way, Stockton, California (site), as was directed <br /> by the San Joaquin County Environmental Health Department (EHD) by letter <br /> dated 08 May 2008. This document can be viewed on the GeoTracker website <br /> maintained by the California State Water Resources Control Board at <br /> https://geotracker.waterboards.ca.gov/. The document contains a work plan to <br /> implement interim remediation at the site to mitigate hydrocarbon-impacted soil <br /> and ground water. <br /> AGE concluded that the site conditions are amenable to high-vacuum (a vacuum <br /> intensity of 25 to 27 inches of mercury) dual-phase extraction, capable of <br /> removing both hydrocarbon vapor and, depending on the site soil type and soil <br /> stratification, dissolved phase hydrocarbons. Extracted vapor is proposed to be <br /> treated by incineration in a thermal catalytic oxidation unit. The vapor stream <br /> entrains impacted ground water and lifts the hydrocarbon vapor/water to a <br /> treatment system. A key aspect of DPE is the high velocity imparted to the <br /> extracted groundwater as the hydrocarbon-laden water travels up the extraction <br />