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' File: W-2017-1/11 : 308 <br /> 1 June 26 , 1986 <br /> Page 2 <br /> o Developing and sampling the ground water monitoring <br /> well . <br /> ' o Presenting the analytical results obtained from the <br /> soil and ground water samples . <br /> ' IV. FIELD ACTIVITIES <br /> ' A. Soil Boring <br /> A single exploratory soil boring was drilled on site to <br /> a depth of 76 . 5 feet . The boring was drilled on April 21 <br /> t and April 22 , 1986 using a truck-mounted Acker AD-II drill <br /> rig equipped with eight-inch outside diameter hollow stem <br /> augers. The location of the monitoring well (MW-1 ) <br /> ' installed in the soil boring is shown on Plate No. 2 . <br /> During the drilling, a Kleinfelder geologist classified <br /> the subsurface soils , collected soil samples , and logged the <br /> borehole. A description of the soils encountered are <br /> uresented on Plate Nos . 4 through 6 , with a copy of the <br /> Unified Soils Classification System (used to identify the <br /> ' soil ) included as Plate No. 3 . The soils encountered during <br /> drilling consisted of silty clay , sandy clay, sandy silt , <br /> clayey sand, silty sand, and sand. <br /> ' Ground water was first encountered at approximately 55 <br /> feet below the ground surface at the time of drilling. <br /> ' B. Monitoring Wells <br /> A ground water monitoring well (MW-1 ) was constructed <br /> in the soil 'boring at the completion of drilling and logging <br /> of the boring. The ground water well was completed with <br /> two-inch inside diameter , flush threaded joint , Schedule 40 , <br /> ' PVC pipe . Well screen sections were perforated with 0 . 020- <br /> inch factory-cut slots . The blank section was set 0 to 45 <br /> feet below the ground surface, and the screened section was <br /> :set45 feet to 75 feet below the ground surface . The PVC <br /> ' pipe was steam-cleaned prior to installation. The annular <br /> suace between the pipe and the wall of the boring was <br /> backfilled with #2 Monterey sand approximately 2 . 6 feet <br /> above the top of the perforated section. A two-foot <br /> bentonite plug was placed above the sand pack to provide a <br /> seal against surface water infiltration. The remaining <br /> annular space was filled to the surface with a neat cement <br /> ' slurry of 5 parts bentonite powder to 100 harts Portland <br />