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3.3 Well Completion <br /> Boring MW-1 was completed as a groundwater monitoring well using a 2-inch diameter PVC <br /> casing with 0.020-inch slotted screen from 5 to 25 feet. The filter pack (#3 lonestar sand) <br /> was installed from 3 feet, 8 inches to 25 feet. Bentonite chips were used to make a two foot <br /> plug and the well was grouted to the surface with Portland cement. <br /> 3.4 Monitoring Well Sampling <br /> On October 26 and December 1, 1994, the groundwater depth was measured relative to the <br /> top of the casing using a Solinst water level meter. After groundwater depth was measured, <br /> a two-stage submersible pump was used to remove water. On October 26, 1994 <br /> approximately 50 gallons of water were removed to develop the well. Groundwater <br /> parameters were measured at two gallon intervals from zero gallons to twenty gallons. On <br /> December 1, 1994, approximately 10 gallons of water was removed to stabilize temperature, <br /> pH and conductivity. Groundwater parameters were measured every one gallon interval <br /> (Appendix B). Purge water was place in 55-gallon DOT drums and stored on-site. <br /> After stabilization, each groundwater sample was collected using a new, disposable plastic <br /> bailer. Samples were collected in 40-m1 EPA vials, placed in a chilled container, and <br /> transported to 'VEST Laboratory for analysis. <br /> 3.5 Laboratory Analysis of Soil and eater Samples <br /> Two soil samples were analyzed for total petroleum hydrocarbons (TPH as gasoline) and <br /> volatile aromatics (BTE&X) in accordance with EPA methods 80151n and 8020, respectively. <br /> Each water sample was analyzed for TPH as gasoline and BTE&,X in accordance with EPA <br /> methods 80151n and 602, respectively. <br /> 4.0 FINDINGS <br /> 4.1 Stratigraphy <br /> In boring MWA, fill material was encountered in the first couple of feet and in lenses to <br /> approximately 12 feet. Clayey sand with silt was encountered at depths of approximately 5 <br /> feet. Clay with silt or silty clay was encountered from depths of approximately 7 feet to <br /> depths of approximately 17 feet. Silty clay with mica was encountered at depths of <br /> approximately 17 feet to approximately 23 feet. Medium- to fine-grained sand with mica was <br /> encountered from depths of approximately 23 feet to the termination of the boring at 25 <br /> feet. No organic vapors were detected in MW-1. Boring log is included in Appendix A. <br /> G.obeiwl A.&S.-w-,Inc. 5 <br /> P-4 P.a PIER/1022/N­IW4 <br />