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14 September 2004 <br /> AGE-NC Project No 99-0559 <br />' Page 4 of 8 <br /> 14U 1 and HU2 <br />' The measured depth to ground water in monitoring wells MW-1 through MW-4 and MW-5A <br /> through MW-8A ranged between 59 87 and 6105 feet below the top of casing (btoc) The ground <br />' water elevation was calculated between 34 73 feet(MW-2) and 35 95 feet(MW-3)below mean sea <br /> level (MSL), the ground water elevation decreased approximately 3 3 feet since the March 2004 <br /> monitoring event,but the top of the ground water table remained within the screened interval of the <br />' wells <br />' At the time of the June 2004 monitoring event, the potentiometnc surface based on HU1 and HU2 <br /> wells inferred a west-northwest ground water flow direction at the former UST release (Figure 3), <br /> at a gradient of approximately 0 004 ft/ft Wells MW-2,MW-3 and MW-7A were not utilized in the <br />' ground water contouring due to the presence of petroleum products in these wells <br />' HU3 and HU4 <br /> In the wells representing HU3 and HU4, the depth to ground water ranged from 60 08 to 60 84 feet <br />'. btoc The ground water elevation was calculated between 35 25 feet(MW-8B)and 35 63 feet(MW- <br /> 7B)below MSL,the ground water elevation from wells in this hydrologic interval decreased 3 6 feet <br /> since the last quarterly monitoring event Ground water was inferred to be flowing northwest at a <br />' gradient of 0 004 ft/ft (Figure 4) <br />' HU5 <br /> Within the upper portion of HU5 (Upper HU5), screened between 125 and 135 feet bsg, ground <br />' water elevation ranged between 35 39 feet (MW-8C) and 35 98 feet (MW-7C) below MSL, the <br /> ground water elevation decreased 3 6 feet since the last monitoring event Ground water at the former <br /> UST release was inferred to be flowing toward the northwest at a gradient of 0 005 ft/ft(Figure 5) <br />' Within the lower portion of HUS Lower HUS screened between 148 and 160 feet bs ground <br /> p { )� g, <br />' water elevation ranged between 35 78 feet (MW-8D) and 36 10 feet (MW-7D) below MSL, the <br /> ground water elevation decreased 3 6 feet since the last monitoring event Ground water was <br /> determined to be flowing toward the northwest at a hydraulic gradient of 0 004 ft/ft (Figure 6) <br /> 1 <br /> HU6 <br />' In the wells representing HU6,the depth to ground water ranged between 61 36 and 62 39 feet btoc <br /> The ground water elevation was calculated between 36 76 feet (MW-5E) and 37 45 feet(MW-7E) <br /> Advanced GeoEnvironmental,Inc <br /> I <br />