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...... ------------ - <br /> with a photoionization detector was used to detect the presence <br /> of hydrocarbons in the soil samples. Soil samples were collected <br /> for chemical analysis, commencing at approximately 5 feet and <br /> extending into the saturated zone. The readings from the CVM are <br /> contained in Table 4. <br /> Well Construction <br /> For Boring MW-I , the first 5 feet was moist dark gray clay with <br /> some organic matter. From approximately 5 to 9 feet medium-gray <br /> silty clay, moist with slightly organic matter. At approximately <br /> 9 to 13 feet, tan clayey silt grading to tan silty fine sand <br /> moist to wet. At approximately 13 feet the material changed to <br /> medium-brown sand, medium grained, little or no fines,, sand <br /> grains subrounded to subangular and saturated. This well was <br /> very quick to charge. At approximately 22 feet the boring was <br /> terminated. <br /> Twelve feet of 0.02 inch screened 2-inch-diameter, Schedule 40 <br /> PVC casing was placed at the bottom of well NW-1 . The remainder <br /> of the well was constructed using regular 2-inch-diameter, <br /> Schedule 40 PVC casing. Approximately 15 feet of #3 Lonestar <br /> Sand was used for the filter pack with a two foot Bentonite seal <br /> above the sand. The remaining portion of the well was filled <br /> with cement grout and a stove pipe placed above grade to avoid <br /> surface water contamination. A locking cap with lock was placed <br /> in the casing to avoid inadvertent surface contamination to <br /> groundwater. <br /> For Boring MW-2, the first 5 feet was moist dark gray clay <br /> plastic and moist. From approximately 5 to 10 feet dark gray <br /> clay, moist, locally silty. At approximately 10 to 15 feet, <br /> medium-brown silty fine sand moist. From approximately 15 to 19 <br /> feet, medium-brown fine sand, wet, little or no fines. From <br /> approximately 19 to 21 feet, light brown clayey silt, moist to <br /> wet. This well was very quick to charge. At approximately 20 <br /> feet the boring was terminated. <br /> Ten feet of 0_02 inch screened 2-inch-diameter, Schedule 40 PVC <br /> casing was placed at the bottom of well MW-2. The remainder of <br /> the well was constructed using regular 2-inch-diameter, Schedule <br /> 40 PVC casing. Approximately 12 feet of #3 Lonestar Sand was <br /> used for the filter pack with a two foot Bentonite seal above the <br /> sand. The remaining portion of the well was filled with cement <br /> grout and a stove pipe placed above grade to avoid surface water <br /> contamination. A locking cap with lock was placed in the casing <br /> to avoid inadvertent surface contamination to groundwater. <br /> For Boring MW-3 , the first 4 feet was dark brown clay, moist and <br /> organic. From approximately 5 to 10 feet medium-gray silty clay, <br /> moist, plastic with veins of caliche. From approximately 10 to <br /> 15 feet, medium-brown silty fine sand with clay, wet, thin lenses <br /> 3 <br />