ARCHIVED REPORTS_QUARTERLY REPORT - THIRD QUARTER 2003

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26 September 2003 • AGE-NC Project No. 98-0500 Page 3 of 5 surface grade [bsg]) monitoring wells MW-1 through MW-5, MW-8 and MW-9 were screened in ' HU1,or First Water Zone; intermediate-screened(75 to 85 feet bsg)wells MW-10 through MW-13 were screened in HU2,or Second Water Zone; and deep-screen(125 to 135 feet bsg)wells MW-14 ' through MW-16 were screened in HU4, or Fourth Water Zone. From the depth to ground water measurements of the shallow-, intermediate- and deep-screened wells collected on 09 July 2003,ground water elevations and gradients were calculated for the First, Second and Fourth Water Zones: • Depths to groundwater for shallow-screen wells ranged between 54.79 and 55.63 feet below ' the tops of well casings. Ground water elevations were calculated to be between 38.15 feet (MW-5) and 38.63 feet (MW-8) below mean sea level (MSL). The general ground water flow direction was northeast from the location of the extraction and observation wells (EW-1, OW-1 and OW-2) at gradients of 0.013 feet/feet between wells MW-3, MW-5 and MW-9 (Figure 3). • Depths to ground water for intermediate-screen wells ranged between 54.90 and 55.28 feet below the tops of well casings. Ground water elevations were calculated to be between 37.46 feet (MW-11) and 38.47 feet (MW-12)below MSL. The general ground water flow lie direction was southeast at gradients of approximately 0.004 feet/feet between wells MW-10 and MW-13 (Figure 4). ' 0 Depths to ground water for deep-screen wells ranged between 56.32 and 56.90 feet below the tops of well casings. Ground water elevations were calculated to be between 39.54 feet (MW-14/16)and 39.59 feet(MW-15)below MSL.The inferred groundwater flow direction was southeast at a gradient of 0.0024 feet/feet (Figure 5). ' Ground water elevation at the site decreased an average 7.5 feet between the May and July 2003 ground water monitoring events (Table 1). ' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES ' Sixteen ground water samples collected from monitoring wells MW-1 through MW-16 were submitted for laboratory analysis: • TPH-g and TPH-ss were detected in ground water samples MW-5,-MW-10, OW-1 and OW-2. TPH-g concentrations included 150 micrograms per liter(µg/1), 1,300 µg/1, 30,000 µg/1 and 120 µg/l, respectively and TPH-ss concentrations included 120 µg/1, 1,100 µg/1 ' 27,000 µg/1 and 95 µg/1, respectively. • ' Advanced GeoEnvironmental,Inc.