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• Groundwater Conditions <br />Groundwater levels measured in the borings for the current investigation are <br />summarized below and also shown schematically on the RDA cross-section (Sheet <br />3). <br />DEPTH TO WATER -CURRENT INVESTIGATION <br />L J <br />Boring Surface Groundwater Depths After Drilling (Feet) <br /> Elevation <br />0 Days <br />2 to 3 Days <br />78 Days <br />TH-201 7486 Dry Dry Dry <br />TH-202 7531 52 52 67 <br />TH-203 7587 Dry Dry 97 <br />TH-204 7637 28 21 Buried <br />TH-205 7640 30 17 Buried <br />TH-206 7647 6 6 Buried <br />The results of the ground water measurements for this investigation indicate free <br />water is present in some layers within the upper portions of the refuse fill. In the <br />borings drilled on the lower three benches, water was found at or below the base <br />of the coal refuse fill. <br />to our 1991 investigation (Reference 5) the RDA was completed to an <br /> <br />elevation of about 7583. Borings were drilled in the top surface of the RDA and a <br />relatively consistent wet layer about 20 feet thick was found. Four of the previous <br />borings were completed as piezometers to various depths (slotted pipe was placed <br />in the bottom 5 feet of the boring and with a bentonite seal above). The results of <br />the previous groundwater measurements are summarized below. <br />10 <br />