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Contamination detected in MW-1 maybe moving differently thanthat detected in MW-2 and MW-3 <br /> due to different sand bodies contributing to the wells. <br /> I Silty sand was encountered at 10 feet bsg in MW5 and MW6 and at 20 feet bsg in MW6 and B7. <br /> Silty clay was encountered at 5 feet and 15 feet through 30 feet bsg in MW5 and at 5 feet, 15 feet, <br /> 25 feet, and 30 feet in MW6. Silty clay was also encountered at 5 feet through 15 feet, 25 feet, and <br /> 30 feet in boring B7. The sand at 10 feet bsg appears to have a north-northeast to south-southwest <br /> orientation;the sand at 20 feet bsg appears to have a east-northeast to west-southwest orientation and <br /> limited lateral extent. <br /> Damp to saturated, gray to brown, silty sand was encountered at 10 feet and 20 feet bsg in borings <br /> MW7 and MW8. Dry to saturated, brown, silty clay and clay were encountered at all other depths <br /> in borings MW7 through MW10. <br /> Saturated soil was encountered in each boring at depths of approximately 10 feet bsg. <br /> GROUND WATER GRADIENT AND FLOW DIRECTION - WELL NETWORK <br />{ <br />� Depths to ground water averaged 12 feet below the well casing tops. The depth to ground water has <br /> ranged from 9.78 to 14.01 feet below the well casing tops. Ground water elevations at the site <br /> ranged from 26.45 to 30.68 feet above mean sea level (MSL) in well MW-1, over the monitoring <br /> period. Ground water levels have steadily decreased over the past four to five years. The water <br /> elevations were within the screened intervals of all the monitoring wells on-site. The ground water <br /> flow direction was inferred using ground water elevation data. The ground water at the site has <br /> inferred to be flowing to the north under an average gradient of 0.005 feet/feet across the area <br /> monitored. <br /> � L <br /> t <br /> i <br /> Advanced GeoEnvironmental,Inc. <br />