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(f <br /> C A M B R I A <br /> significant hydrocarbon mass was present in this source area and that SVE was feasible and <br /> i <br /> effective Subsequent borings Geo-2 (September 1995) and SB-5 (May 2000) confirm that <br /> I <br /> petroleum hydrocarbons in this source area were reduced by SVE, but moderate levels remained <br /> Since groundwater monitoring began in July 1990, the groundwater table has risen approximately <br /> 20 feet Groundwater analytical results from well VEW-2 indicate that moderately high levels of <br /> petroleum hydrocarbons are present in the former UST area Since SVE appeared to be feasible <br /> and effective from prior testing, Cambria proposed DPE for intenm remediation of the residual <br /> contamination in this source area DPE uses groundwater extraction to dewater the current j <br /> saturated zone and expose impacted soils in the 35- to 504bg range to SVE Cambna performed <br /> DPE from wells VEW-1 and VEW-2 between June 21 and 25, 2004 <br /> The objective of interim remediation at the subject site was to <br /> 1) remove residual hydrocarbon mass from soil and groundwater, <br /> 2) assess the magnitude of hydrocarbons and vapor yield from the source area, <br /> 3) determine whether extracted vapor concentrations would be sustained over time, <br /> 4) estimate a radius of influence, <br /> 5) assess vapor-phase mass removal of hydrocarbons by DPE, and <br /> 6) assess groundwater yield and dissolved-phase mass removal of hydrocarbons by DPE <br /> DPE Test Protocol <br /> DPE Equipment Cambria used a Solleco trailer-mounted liquid-ring pump with electric catalytic <br /> oxidizer (Solleco unit) as the extraction and vapor abatement device during interim remediation A <br /> 100-kilowatt generator powered the Solleco unit A recirculation valve controlled the applied <br /> vacuum and vapor extraction flow rate The Solleco unit is equipped with auto-dilution and <br /> manual dilution valves for additional vacuum and flow control, as well as to maintain oxidizer <br /> temperatures witlun the specified range <br /> Cambria measured field vapor concentrations with a Horiba model MEXA554JU orgaruc vapor <br /> analyzer (OVA) and collected vapor samples in 1-liter tedlar bags using a Thomas Industries <br /> model 907CDC 18F vacuum pump Cambria monitored the vacuum induced in nearby wells, at the <br /> wellhead and within the sample manifold using Magnehehc differential pressure gauges and used a <br /> thermal anemometer to measure extraction flow rates within the sample marufold <br /> 0854 5 <br />