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i <br /> i <br /> 3.3 Well Completion <br /> IThe boring was completed as a groundwater monitoring well using a 2-inch diameter FVC <br /> casing with 0 020 screen from 30 to 50 feet The filter pack (#2/12 sand) was installed from <br />' 28 to 50 feet Bentonite chips were used to make a two foot plug and the well was grouted <br /> to the surface with Portland Cement <br /> I3.4 Monitoring Well Sampling <br /> On October 19, the water levels in all four (4) wells were measured relative to the top of <br /> the casing using a Solonist water level meter The relative piezometrnc levels and hydraulic <br /> gradient were determined from these data In accordance with an agreement between the <br /> PHS/EI-ID and Comfort Air, only MW-4 was sampled <br /> IAfter water levels were measured, a three-stage purge pump was used to surge and purge <br /> MW-4 Approximately 10 gallons of water were removed to stabilize temperature, pH and <br /> Iconductivity (see Table 1) The purge water was stored in 55-gallon drums on-site A water <br /> TABLE 1 <br /> GROUNDWATER STABILIZATION DATA <br /> October 19, 1993 <br /> Volume Temperature Conductivity <br /> (gallons) PH (°F) (µS/cm x 100) <br /> MW-4 <br /> 0 87 667 281 <br /> 1 56 671 290 <br /> 2 75 668 303 <br /> 3 89 658 325 <br /> I 4 84 663 333 <br /> 5 102 653 349 <br /> 6 69 660 347 <br /> 7 41 655 296 <br /> 8 89 659 284 <br /> 9 88 661 315 <br /> 10 152 667 307 11 <br /> 5 <br /> I <br />