Laserfiche WebLink
. 18 June 2004 <br /> AGE-NC Project No 99-0559 <br /> Page 5 of 8 <br /> HU5 <br /> Within the upper portion of HU5 (Upper HU5), screened between 125 and 135 feet bsg, ground <br /> water elevation data collected from monitoring wells MW-5C through MW-7C ranged between <br /> 31 55 feet(MW-8)and 32 07 feet(MW-5C)below MSL Ground water elevation from wells in this <br /> hydrologic units increased 5 6 feet since the last monitoring event Ground water at the former UST <br /> release was inferred to be flowing toward the north away from the former UST area with a hydraulic <br /> gradient of 0 0025 ft/ft (Figure 5) <br /> Within the lower portion of HU5 (Lower HU5), screened between 148 and 160 feet bsg, ground <br /> water elevation data collected from monitoring wells MW-5D,MW-713 and MW-81)ranged between <br /> 31 90 feet (MW-8D) and 32 16 feet (MW-7D) below MSL Ground water elevation from wells in <br /> this hydrologic units increased 5 6 feet since the last monitoring event Ground water was determined <br /> to be flowing toward the northwest at a hydraulic gradient of 0 002 ft/ft (Figure 6) <br /> HU6 <br /> Ground water elevation data collected from monitoring wells MW-5E through MW-8E ranged <br /> between 32 56 feet (MW-8E) and 32 96 feet (MW-7E) below MSL Ground water elevation from <br /> wells in this hydrologic units increased 5 7 feet since the last quarterly monitoring event Ground <br /> water was inferred to be flowing toward the northwest with a hydraulic gradient of 0 003 ft/ft <br /> (Figure 7) <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> Twenty-five ground water samples were analyzed by CTEL for the chemical constituents referenced <br /> in Section 2 2 The following is a summary of the analytical results for each hydrologic unit <br /> HU1 and HU2 <br /> TPH-g was detected in all samples except MW-8A at concentrations ranging between <br /> 7,500 micrograms per liter(µg/l)in samples MW-5A and MW-6A to 590,000µg/1 in sample MW-1 <br /> BTEX compounds were detected in all samples except MW-5A,MW-6A and MW-8A at maximum <br /> concentrations of 48,000 µg/1 benzene, 71,000 µg/1 toluene, 3,800 �tg/1 ethyl benzene and <br /> 18,000 µg/l total xylenes in sample MW-1 Significant concentrations ofBTEX were also detected <br /> in the sample from well MW-7A, near the former UST area <br /> Advanced GeoEnvironmental,Inc <br />