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OS May 1997 <br /> AGE-NC Project No 95-0173 <br />' Page 5 of 29 <br />' metals in the soil or to excessive concentrations of gasoline constituents Copies of the microbial <br /> enumeration and physicochemical laboratory reports are included with Appendix B <br /> On 30 June 1997, one soil sample (VW 1-25) was submitted for laboratory fate evaluation analysis <br /> of permeability, porosity, moisture and percent organic content, one soil sample (MW7-30) was <br /> submitted for analysis of porosity and moisture Analysis of V W 1-25 reported an average <br />' permeability of 5 X 10-' , porosity at 49 47 percent, moisture at 35 90 percent and organic content <br /> ,a�3 7 percent Analysis of MW7-30 reported porosity at 42 6 percent and moisture at 24 9 percent <br /> ` <br /> Copies of the fate evaluation laboratory reports are included as Appendix B <br /> 3.0. SOIL VAPOR EXTRACTION PILOT TEST <br />' 3 1 SOIL VAPOR EXTRACTION SYSTEM <br />' On 14 July 1997, an 8-hour soil vapor extraction test(SVE pilot test) was conducted at the site The <br /> SVE pilot test was performed to provide vapor extraction data for feasibility analysis of the <br /> remediation method and for proper design of the remediation system <br /> The test was conducted using a vapor extraction system (VES), VACLEEN I OOOG, manufactured <br />' by Environmental Techniques The VES consists of a positive-displacement blower, driven by an <br /> internal combustion (IC) engine The inlet of the VES was connected to well VW-I The vacuum <br /> applied to VW-1 caused hydrocarbons in the soil to volatilize and flow through the vacuum pump <br /> 1 to the IC engine The induced vacuum was measured at surrounding monitoring points using <br /> Magnehelic vacuum gauges <br />' The extracted hydrocarbon vapor was destroyed in the IC engine as part of the normal internal <br /> combustion process Emissions from the engine were routed through two catalytic converters to <br /> maximize the destruction rate of hydrocarbon vapor <br /> 1 <br /> 3 2 PILOT TEST PROCEDURES <br /> Air-tight well caps with attached Ma nehelic vacuum gauges,were attached to SVE well VW-2 and <br /> monitoring wells MW-I through MW-4 The air stream from VW-1 was monitored for the presence <br /> of organic vapor using an organic vapor analyzer(OVA) equipped with a photo-ionization detector <br /> (PID Thermo Environmental 580A, 10 0 eV calibrated to isobutylene) The air flow was monitored <br /> using a Dwyer DS-200 flow sensor The flow rate was determined from the measured differential <br /> pressure and the piping diameter using a nomograph (Appendix D) Field measurements were <br /> recorded at regular intervals throughout the pilot test and are summarized in Table 5 <br /> 1 <br /> 4dvmuedGeoEnwonmental,Inc <br /> 1 <br />