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s <br />' 05 May 1997 <br /> AGE-NC Project No 95-0173 <br /> Page 7 of 29 <br />' 35 ANALYTICAL RESULTS OF VAPOR SAMPLES <br /> During the SVE pilot test, TPH-g was detected in vapor samples collected from VW-1 at <br />' concentrations ranging up to 50,000 parts per billion (ppb, reported as micrograms per liter), TPH-d <br /> was detected in one selected vapor sample collected from VW-1 at a concentrations of 390 ppb The <br /> laboratory reported the TPH-d analysis to have significant gasoline range compounds <br />' BTEX compounds were detected in vapor samples collected from VW 1 at concentrations p to u 4 400 <br /> P p , <br /> ppb Concentrations of benzene were encountered from VW1 at concentrations ranging between 650 <br /> ppb and 720 ppb MTBE was not detected in any of the vapor samples as analyzed by EPA Method <br /> 8020 Analytical results of air samples are summarized in Table 4 The laboratory report <br />' (McCampbell Analytical Inc Lab I D 78640 to 78643) and chain-of-custody forms are presented <br /> in Appendix D <br /> Converting the TPH-g values from ppb to parts per million volume(ppmv),concentrations of TPH-g <br /> ranged from 11,200 ppmv to 14 000 ppmv Equations for conversion of ppb to ppmv are included <br /> in Appendix E <br /> 4.0. IN-SITU AIR SPARGING PILOT TEST <br /> 41 PROCEDURES <br /> 4 1 1 System Installation and Set-Up <br /> From 13 through 15 January 1998. an in-situ air sparging (IAS) pilot test was performed at the site <br /> This pilot test was performed to provide data to evaluate the feasibility of air sparging as a <br /> remediation method at the site Initiation of the IAS pilot test involved installation of two-inch <br /> diameter PVC piping above ground from a temporary air compressor-to the IAS wells AW-1 and <br /> AW-2 Compressed air was supplied to the two IAS wells at a pressure of appro"imately 15 pounds <br /> per square inch (psi) Approximately 5 to 7 psi was required to overcome the water column in the <br /> sparging wells <br /> For the _ _ <br /> IAS pilot test, wells MVi -1 through MW-4, VW 1 and VW 2 were utilized for observation <br /> points Each well was fitted with air-tight well caps, valves and tubing for monitoring <br /> pressure/vacuum and organic vapors in each well <br /> Advanced CeoEn%kronmental,Inc <br />