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1 ' 27 December 2004 . AGE-NC Project No. 95-0185 ' Page 3 of 4 I j 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION During the September 2004 sampling event, the depth to ground water ranged from 28.02 feet (MW-3) to 28.51 feet (MW-1) below casing grade; however, the depth to ground water at well MW-1 (28.51 feet) was affected by the presence of free product; the depth was recalculated (28.45 feet)utilizing the measured thickness of free product (0.08 ft) in well MW-l: Dw=Dm - (tg * dgldw} ' Dw=Corrected depth to water Dm =Measured depth to water(28.51 feet) tg=Total thickness of free product (-0.08 feet) dg=Density of free product(gasoline at—0.75 gm/ml) dW=Density of water(-1.0 gm/ml) ' The calculated ground water elevation ranged from 31.32 feet(MW-1)to 32.12 feet(MW-3)above mean sea level (MSL). The ground water flow was inferred to be towards the east at a gradient of 0.008 ft/ft(Figure 3). 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-d, TPH-g, BTEX compounds and fuel additives were not detected in the analyzed samples. Current and previous analytical results are summarized in Tables 2 and 3. The laboratory report (CTEL Project No. CT214-0409148),quality control/quality assurance(QA/QC)reports and chain of custody forms are included in Appendix C. GeoTracker confirmation pages of the submitted ' laboratory electronic deliverable format(EDF) files and depth to water measurements are provided in Appendix D. ' 4.0. CONCLUSIONS ' Based on the data collected during the September 2004 monitoring period, AGE concludes: • A measured 0.08 ft of free product was recovered in well MW-1 during the September 2004 ' monitoring event. Free product has been present intermittently in wells MW-1 and MW-4 since the June 2002 ground water monitoring event. Well MW-4 was inaccessible this quarter, so it was not monitored. 1 i Advanced GeoEnviron mental,Inc.