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Revised LFR Levine-Fricke <br /> 2.2.2 intermediate Zone Groundwater <br /> During the 2001 investigation, PCE was detected at concernrations up to 2,800 lAgll In <br /> grab groundwater samples collected between 75 feet and 125 feet bgs, VOC <br /> concentrations in collected groundwater samples within this depth interval are depicted <br /> in Figure 9 <br /> 2.2.3 Deep Zone Groundwater <br /> During the 2001 investigation, PCE was detected at concentrations ranging from 49 to <br /> 180118/1 in 3 grab groundwater samples collected at depths greater than 125 feet bgs in <br /> the vicinity of MW-09 (locations G-0l, (3-02, G-03) VOC cone mtrations in collected <br /> groundwater samples within this depth interval are depicted in Figure 9 <br /> i <br /> 3,0 PILOT TEST REMEDIATION TECHNOLOGIES <br /> Under the proposed pilot test program, LFR will <br /> Perform field investigations to assess <br /> + <br /> the effectiveness of soil vapor extraction and groundwater sparging technologies A <br /> brief description of the remedial technologies to be evaluated during the pilot study is <br /> presented in the following sections <br /> I <br /> 3.1 Soil Vapor Extraction <br /> Soil vapor extraction (SVE) is a soil remediation process that uses vacuum blowers and <br /> extraction wells for the purpose of creating pressure gradients m the subsurface to <br /> induce airflow to remove VOCs from unsaturated soils. The vacuum enhances the <br /> volatilization of the chemicals m vapor phase, and the extracted vapors are collected <br /> and treated SVE not effectively remove petroleum hydrocarbons that have Iow <br /> volatility, e.g., total petroleum hydrocarbons as diesel (TPHd). However, VOCs (e g <br /> PCE) may be effectively removed by SVE. Since this technology is implementable, has <br /> a moderate cost, and may be effective, SVE has been selected for pilot testing, <br /> In general, SVE remediation systems are designed using information from site geologic <br /> characterization and pilot scale testing. The primary tool for assessing design <br /> requirements will be the pilot testing program described in the following sections Once <br /> completed, the investigative tests will have generated the data necessary to assess SVE <br /> applicability, effectiveness, and cost for a full-scale soil-vapor extraction treatment <br /> system (SVETS) design. <br /> 3.2 Sparging <br /> 1 Sparging is a groundwater remediation process that involves the sparging of gas into the <br /> subsurface within the saturated zone. Sparging can be accomplished by sparging of <br /> WP4VE0,S-s.od1•rc,be123 doe is <br /> Page 5 <br /> Obi80 d 82T0b9V60ZT 01 906P Z99 OTS 3AD183 3NIA31 d31 N=1 92 9T Z0, 60 -lnr <br />