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31 Extraction Well and Manometer Point Installation <br /> Location and configuration of the extraction well is based primarily on the assessed <br /> distribution of petroleum hydrocarbons in the subsurface The source of subsurface <br /> data is Western Geologic Resources, Inc (WGR) "Subsurface Investigation" reports <br /> ' dated November 1989 and August 1990 <br /> 3 11 Location and Depth of Extraction Well and Manometer Points <br /> ' One extraction well pair (VEW-1) consisting of one shallow and one deep <br /> well casing, was installed at the west end of the former tank location Two <br /> manometer pairs (MP-1 and MP-2) were installed approximately 15 feet east <br /> of VEW-1 and 25 feet west of VEW-1, respectively Figure 2 shows the <br /> approximate locations of the extraction well and manometer points MP-3 <br /> ' was not installed as originally planned The presence of overhead and <br /> subsurface obstructions and overhead high voltage power lines prevented safe <br /> accessibility by the drill rig in the vicinity of MP-3's proposed location <br /> ' The two manometer airs MP-1 and MP-2 were installed to coli vacuum- <br /> pressure <br /> ( ) collect acuu <br /> ' pressure data from around the extraction well Measurements recorded at <br /> each manometer during vapor extraction were used to evaluate the expected <br /> radius-of-influence for the selected blower An inclined U-tube manometer <br /> filled with water was used to measure vacuum pressures at each manometer <br /> point <br /> 3 12 Extraction Well and Manometer Point Construction <br /> Bore holes for VEW-1 Shallow and Deep, MP-1, and MP-2 were drilled to <br /> depths of 34 and 66 feet, , respectively, using a Moble <br /> Drill equipped with an eight inch Hollow Stem Auger No groundwater was <br /> encountered in the bore holes <br /> The VEW-1 well pair is constructed of two-inch diameter, open-ended, blank <br /> PVC casing set in a #3 sand backfill to depths of 30 and 63 feet, respectively <br /> ' MP-1 and MP-2 pairs are constructed of 3/4 inch PVC casing set in #3 sand <br /> backfill to depths of 33 and 63 feet, respectively The construction details for <br /> the extraction well and manometer points are shown on the Well Logs (Plates <br /> ' 2,3 & 4) Appendix A <br /> 32 Soil Sampling & Baseline Chemical Analyses <br /> 1 Chemical analyses were used to confirm the site assessment data, obtained by WGR <br /> in 1989-90, and to establish a baseline for soil contaminant concentrations which <br /> would be used to evaluate the effectiveness of the forthcoming in-situ vapor <br /> extraction remediation project <br /> 2 REMEDIATION <br /> ' SERVICES, INC <br />