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1 <br /> 04 February 2000 <br /> AGE-NC Project No. 98-0433 <br /> ' Page 3 of 5 <br /> ' feet above mean sea level (msl). <br /> The ground water elevation in each well and hydraulic gradient were calculated from these data. The <br /> ' ground water flow direction and gradient were calculated from the groundwater elevation data. The <br /> flow was directed toward the west at a very low gradient of 0.001 ft/ft, away from the former UST <br /> area; however the ground water flow direction appear to be directed somewhat west toward the'truck <br /> ' wash area from well MW-6, southwest from wells MW-4 and MW-7 and northwest from well MW- <br /> 8. The gradient flattens west of the former UST area. Figure 3 illustrates the contoured ground water <br /> elevations as measured on 11 January 2000. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> ' TPH-g was detected in the ground water samples collected from MW-1, MW-2, MW-6, and MW-8 <br /> at concentrations ranging from 250 yg/1 (MW-6) to 3,900 ,ug/l (MW-1). TPH-d was detected in <br /> ' water samples from wells MW-1 through MW-3 and MW-6 through MW-8 at concentrations <br /> ranging from 80,ugll (MW-3) to 2,600 ,ugll (MW-1). <br /> Benzene was detected in one of the ground water well samples. Well MW-1 near the former UST <br /> excavation contained benzene at a concentration of 820 1. Other volatile organic compounds were <br /> exca µgr g p <br /> ' detected at concentrations up to 190 µg/l (xylene). <br /> MTBE was detected in two of the water samples analyzed by EPA method 8020 and four of the <br /> samples analyzed by EPA method 8260. MTBE was detected in wells MW-1,-MW-2, MW-3 and <br /> ' MW-4 at concentrations ranging from 2.2/cg/l to 7,400 4gll(EPA 8260); DIPE was detected in one <br /> of the water samples analyzed at a concentrations of 7.8,ug/l(MW-8), and TBA was detected in well <br /> ' MW-2 at a concentration of 21 Mcg/l. <br /> Neither petroleum hydrocarbons or fuel additives were detected in the domestic water well on site. <br /> Analytical results from ground water samples are summarized in Table 2. The laboratory report <br /> (MAI Lab ID Numbers 29107 through 29115),QA/QC and chain-of-custody are included in <br /> ' Appendix B. <br /> fi <br /> Advanced GeoEnviromnental,Inc. <br />