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=i t ' 27 April 2003 AGE-NC Project No 96-0235 ` Page 5 of 8 Boring logs for soil borings MW-14B and MW-15B are included as Appendix A Lrthologlc cross ' sections are included as figures 3 and 4 ' 32 ANALYTICAL RESULTS OF SOIL SAMPLES ' Soil samples collected from pilot borings MW-14B and MW 15B at depths of 15 feet,25 feet,40 feet and 55 feet bsg were analyzed as described in Section 2 13 None of the target analytes were detected above laboratory reporting limits in the analyzed soil samples The laboratory report(CTEL ' Laboratory IDs 0211-137-1 through 0211-137-8),chain-of-custody forms and the laboratory QA/QC report are included in Appendix B 3 3 GROUND WATER GRADIENT AND FLOW DIRECTION ' Depths to ground water ranged from 17 72 feet to 21 70 feet below the tops of the well casings, ground water was within the screened intervals ofthe shallow wells,but was approximately 10 5 feet • above the screened,nterval of mtermedlate wells MW-3 and EW-2 and between 19 44 and 44 14 feet ' above the screened intervals of the deep wells The elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations at the site ranged from 12 56 f eet (MW-8A) t o 14 07 f eet (MW-2)b elow m can sea 1 evel T he a verage g round w ater ' elevation in the wells decreased by approximately 0 24 feet since the September 2002 ground water monitoring event Figure 3 illustrates the ground water potentiometric surface based on the shallow-and deep-screened data sets Near the former UST cluster, the shallow-screened data delineated an inward-radiating ground water flow pattern,with a net flow towards the east-northeast at a gradient of 0 004 ft/ft,the deep-screened data delineated a radial ground water flow direction toward the east to southeast at a gradient of 0 006 ft/ft Near the former UST No 3 excavation ground water flow direction at the -- - shallow-screened level was inferred to be towards the east-southeast at a gradient of 0 005 ft/ft, ' ground water flow direction at the deep-screened level was inferred to be toward the south-southwest at a gradient of 0 018 ft/ft 3 4 ANALYTICAL RESULTS OF WATER SAMPLES TPH-g was detected in the samples collected from MW-1, MW-2, MW-10, EW-1 and EW-2 at . concentrations as high as 14,000 micrograms per liter (µg11) in the sample collected from EW-1 Advanced GeoEnvironmental,Inc