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' 29 January 2001 <br /> AGE-NC Project No 00-0725 <br />' Page 9 of 11 <br />' 4 4 GROUND WATER ELEVATION AND GRADIENT <br /> The ground water table occurred within the screened intervals of the wells monitored Ground water <br />' was inferred to be flowing north and south, divergent from the the excavation area (Figure 4) The <br /> gradient for the ground water surface was approximately 0 002 ft/ft <br />' 4 5 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> MAI received, extracted and analyzed the ground water samples on 12 through 15 December 2000 <br /> time period MAI issued a report dated 16 December 2000 The analytical results from the 11 <br /> December 2000 ground water samples are as follows <br />' • Dissolved petroleum hydrocarbons were detected in four of the five samples from the <br /> monitoring wells <br />' • In general, the highest concentrations of hydrocarbons were detected in the water sample <br /> from monitoring well MW-2 which contained 11,000 microgram per liter (µg/1) TPH-g, <br />' 2,900µg/1 TPH-d, 160,ug/1 benzene, 130 µg/1 toluene, 640µg/1 ethylbenzene and 840µg/1 <br /> total xylenes <br />' • BTEX compounds were detected in water samples from four wells However, benzene was <br /> only detected in sample MW-2 Toluene was the only BTEX compound detected in ground <br /> water samples collected from wells MW-4 and MW-5, located in the cross gradient direction <br />' • TPH-d was detected in samples from all the properly-screened monitoring wells at <br /> concentrations as high as 2,900µg/1 (MW-2) Lower TPH-d concentration were detected in <br /> the samples from the cross gradient well, MW-3, and at lower concentrations in samples <br /> from wells MW-4 and MW-5 located in the down gradient direction <br /> • Fuel additives were not detected in any of the ground water samples collected during the <br /> ground water monitoring event <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables <br /> 4 and 5 The laboratory reports for the quarterly monitoring event (MAI Laboratory ID No 55479- <br /> 55753) QA/QC reports and chain-of-custody form are included in Appendix G <br /> Advanced GeoEnvironmental,[tic <br />