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,r <br /> 14 November 1995 <br /> AGE-NC Project No 95-0121 <br />' Page 5 of 20 F <br />' Blank PVC casing was installed from surface grade to 15 feet The sand pack was installed from total <br /> depth to two feet above the screened interval in each well A two-foot bentonite plug was installed <br /> above the sand pack and the borings were backfilled to surface grade using Portland Cement A water <br />' tight well box was installed over each well <br /> 44 STRATIGRAPHY 4 <br /> ' <br /> Soil composed of clay to clayey silt was encountered from the surface to depths of approximately 27 <br /> feet bsg in each boring Clayey to silty sand was encountered from approximately 27 feet to 32 feet <br /> bsg in boring EW-I and from 27 to 30 feet bsg (total depth) in bonngs VW-1 and VW-2 Clayey to <br /> ' sandy silt was encountered in boring EW-i from a depth of 32 to 40 feet bsg (total depth) <br /> 45 FIELD AND LABORATORY RESULTS OF SOIL SAMPLES <br /> Orgaruc vapors were detected in soil samples collected over the entire depth of bonngs EW-1 and <br /> VW-1 at concentrations ranging from 1 ppm to 813 ppm Organic vapors were detected in boring <br /> VW-2 from 15 feet bsg to total depth (30 feet bsg) at concentrations as high as 1,118 ppm <br /> TPH-g, TPH-d and BTE&X were detected in soil samples from each vapor well The highest <br />' concentration of TPH-g, 6,500 mg/kg (parts per mullion), was detected in boring VW-2 at a depth <br /> of 25 feet bsg The highest concentrations of TPH-d and BTE&X were detected in samples from <br />' EW-1 The analytical results of the soil samples are summanzed in Table 3 The laboratory report and <br /> chain-of-custody form are included in Appendix B <br /> 5.0. ,VAPOR EXTRACTION PILOT TEST <br />' 5 1 SOIL VAPOR EXTRACTION SYSTEM <br /> On 3 August 1995, an 8-hour soil vapor extraction test was conducted This pilot test was performed <br />' to provide vapor extraction data for feasibility analysts of the method for proper system design of the , <br /> remediation system <br />' The test was conducted using a vapor extraction system (VES), VACLEEN 1000G, 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 extraction well EW-1 The <br /> vacuum applied to the extraction well causes hydrocarbons in the soil to volatilize and flow through <br /> Sthe vacuum pump to the IC engine The induced vacuum was measured at surrounding monitoring <br />