Laserfiche WebLink
10 August 2005 <br /> . AGE-NC Project No 99-0559 <br /> Page 4 of 8 <br /> within the interval of HU 1 and HU2 wells was inferred to be toward the northwest at the former UST <br /> area and north at the location of well MW-5 (Figure 3), at a gradient of 0 011 ft/ft <br /> E HU3 and HU4 In the wells representing HU3 and HU4, the depth to ground water ranged from <br /> 54 34 to 55 23 feet btoc The ground water elevation was calculated between 29 40 feet(MW-7)and <br /> 30 01 feet (MW-5) below MSL, the ground water elevation from wells in this hydrologic interval <br /> E increased 9 4 feet since the last quarterly monitoring event Ground water was inferred to be flowing <br /> southwest at a gradient of 0 003 ft/ft(Figure 4) <br /> HU5 Within the upper portion of HU5 (Upper HU5), screened between 125 and 135 feet bsg, <br /> ground water elevation ranged between 29 68 feet(MW-7)and 30 16 feet(MW-5)below MSL,the <br /> ground water elevation increased 9 2 feet since the last monitoring event Ground water at the former <br /> UST release was inferred to be flowing toward the southwest at a gradient of 0 002 ft/ft(Figure 5) <br /> Within the lower portion of HU5 (Lower HU5), screened between 148 and 160 feet bsg, ground <br />` water elevation ranged between 29 80 feet(MW-7)and 30 66 feet(MW-5)below MSL,the ground <br /> water elevation increased 8 7 feet since the last monitoring event Ground water was determined to <br />� . be flowing toward the southwest at a hydraulic gradient of 0 004 ft/ft(Figure 6) <br /> HU6 In the wells representing HU 6,the depth to ground water ranged between 55 91 and 56 78 feet <br /> btoc The ground water elevation was calculated between 31 31 feet(MW-5)and 3162 feet(MW-7) <br /> below MSL, the ground water elevation from wells in this hydrologic units increased 7 9 feet since <br /> the last quarterly monitoring event Ground water was inferred to be flowing toward the northeast <br /> at a hydraulic gradient of 0 001 ft/ft (Figure 7) <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> Ground water samples were analyzed by CTEL for the chemical constituents referenced In <br /> Section 2 2 The following is a summary of the analytical results <br /> HU1 and HU2 TPH-g was detected in wells MW-1 through MW-4 and well MW-5A, MW6A and <br /> MW-7A at concentrations ranging from 2,200 micrograms per liter (µg/1) in well MW-5 to <br /> 1,100,000µg/1 in the sample from well MW-1 Various BTEX compounds were detected in samples <br /> from HU1 and HU2 at maximum concentrations of 59,000 µg/1 benzene (MW-7A), 69,000 µg/1 <br /> toluene (MW-2), 48,000 µg/1 ethyl-benzene (MW-1) and 173,000 µg/1 total xylenes (MW-1) The <br /> fuel additive MTBE was detected in samples at concentrations ranging from 1,400µg/1 in the sample <br /> MW-1 to 68,000 µg/1 in the sample from well MW-7A ETBE was detected at a maximum <br /> concentration of 160 µg/1 in the sample MW-7A and detected at lesser concentrations in samples <br /> collected from every well but MW-1 TAME was detected at the following concentrations 80 µg/1 <br /> Advanced GeoEnvironmental,Inc <br />