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9 <br /> t� <br /> y..c <br /> C. Soil and Groundwater Conditions <br /> The general soil conditions encountered during drilling <br /> consisted of compacted silty sand and old asphalt at the <br /> surface. Below the thin surface layer lies a fine to <br /> medium grained sand with gravel in the upper zone. <br /> Beneath this sand/gravel zone, the soils vary from fine to <br /> -- medium sands until a non-water bearing silty clay zone is <br /> encountered at a depth of about 21 feet. The wells were <br /> terminated in this silty clay zone at a depth of 25 feet. <br /> Groundwater was encountered between 16 and 17 feet at the <br /> time of drilling. Water level measurements -taken on June <br /> s, 1987 yielded depths of 16.8 feet for well W-5 and 16.1 <br /> feet for well W-6. Each well was purged of at least three <br /> well volumes of water utilizing a steam cleaned 1.7" Tri- <br /> loc hand pump. Discharge from each well was placed in a <br /> DOT approved 55 gallon drum (17E) then sealed, and placed <br /> on a pallet pending chemical results. After purging, each <br /> well was allowed to recharge for a time then sampled from <br /> the hand pump discharge line. The pump and associated <br /> sampling equipment was thoroughly washed after each <br /> sampling effort. The water samples were collected in <br /> factory cleaned sampling Jars, immediately sealed, and put <br /> in cold storage for transportation to the chemical <br /> labot',;,tory._..._._WeZ1.. W-5 exhibited strong petroleum odors and <br /> sheer was seen on the effluent from the discharge hose <br /> 4 <br />