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3.2 Logging Soil was extruded from the second brass tube and screened for the presence of organic ' vapors, using a PID, and the reading were recorded on the boring logs The soil was then described in accordance with the Unified Soil Classification System Boring Logs are included in Appendix A ' 3.3 Well Completion ' Boring B-6 was completed as groundwater monitoring well MW-4 using 2-inch diameter PVC casing with 0 020 screen from 5 to 20 feet The filter pack (#3 Lonestar sand) was ' installed from 4 feet to 20 feet A surge block was used to set the sand pack Bentonite pellets were used to make a 1 5-foot plug and the well was grouted to the surface with Portland cement ' 3.4 Monitoring Well Purge Procedures ' On December 11, 1994, the water levels in each monitoring well were measured relative to the top of the casing using a Solinst water level meter The relative piezometrrc level in each well and hydraulic gradient were determined by subtracting the deptli-to-water from the relative casing elevation (Table 1) After water levels were measured, a clean PVC bailer was used to surge and purge each well Five to eight gallons (minimum three well volumes) of water were removed from each well to stabilize temperature, pH and conductivity (Appendix C) Stabilization parameters were measured at one-gallon intervals using an ICM water analyzer The purge water was stored on-site in 55-gallon DOT drums TABLE 1 RELATIVE GROUNDWATER ELEVATIONS Grant Line Gas & Food I 2420 Grant Line Road Depth to Groundwater Groundwater Elevation Well No Casing Elevation ' 4-13-94 12-11-94 4-13-94 12-11-94 MW-1 2000 817 882 1183 11 18 MW-2 2016 808 886 1208 1130 MW-3 1955 725 799 1230 1156 MW-4 1921 ---- 809 ---- 11 12 ' Measurements In Feet (l.oI-&—I Add Semcs+.I.. SC 94M 101aOZIG..f Lis O..R Fb d QR U12 94