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<br /> 08 October 1999 -
<br /> AGE=NC Project No 95-0121 ' r
<br /> Page 3 of 6 i
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<br /> I' decreased an average 0 52 feet between the March 1999 and the June 1999 ground water monitoring "
<br /> events, a long term trend of increasing'ground water elevations is indicated by data obtained at the
<br /> site since February 1991
<br /> The general ground water'gradient in the area bound by wells MW-1, MW-2, MW-3, MW-4 and
<br />' MW-7 was calculated to be approximately 0 001 ft/ft or approximately 5 feet per mile and directed
<br /> towards the northeast which is consistent with past gradient and flow direction determined at the'site
<br /> (Figure 3) The ground water surface elevation at the site is approximately 9 feet to 18 feet above
<br /> the slotted screen intervals in wells MW-1, MW-2, MW-3,MW-4 and MW-7 Therefore these wells ,
<br /> are "drowned", and yield data representative of deeper ground water ,F
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<br /> Based on the ground water monitoring data collected from wells VW-3, VW-4, VW-6 and VW-8
<br />' on 28 June 1999, ground water flow direction bound by these wells appeared to have a southwesterly
<br /> ground water flow direction(Figure 4) at a calculated gradient of 0 001 ft/ft and was contrary to the t
<br /> ground water flow direction observed in the surrounding area bound by wells MW-1,MW-2, MW-3,
<br /> MW-4 and MW-7 The ground water elevation at the site was appropriately screened through wells
<br /> VW-3, VW-4, VW-6 and VW-8, therefore these wells yield data representative of shallow ground ;
<br /> water
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<br />' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES r
<br /> TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-4, MW-7,
<br /> VW-3, VW-4, VW-6 and VW-8'at concentrations ranging from 230 micrograms per liter (,cg/l) to
<br /> 52,000,ug/l TPH-d was detected in water samples collected from wells MW-2, MW;4, MW-7, VW-
<br /> 3, VW-4, VW-6 and VW-8 at concentrations ranging from 78 µg/l to 1,100 µg/l, the laboratory
<br /> reported that the chromatograms for the samples did not have typical diesel characteristics s
<br />' Various BTEX compounds were detected In water samples collected from MW-1,,MW-2, MW-3,
<br /> 'MW-4' MW-7„VW-3, VW-4, VW=6 and VW-8 at concentrations ranging between 3 6 µg/l and
<br /> 11,000 ,ug/l (benzene, MW-3) MTBE was detected in water samples collected from wells MW-1,
<br /> VW-4, VW-6 and VW-8 at,concentrations as high as 88 4g/I
<br /> MTBE was detected utilizing EPA'Method 8260 Modified In water samples,collected from wells ^
<br /> r AMW-1, - ^ I
<br /> MW-2, V W-6 and at concentrations ranging between 9 1 yg/l and 170 ug/l
<br /> TBA was detected in water samples collected from wells MW-1, MW-4, VW-4, VW-6 and VW-8
<br /> at concentrations as high as 75 kcg/1 No other fuel oxygenated compounds were detected during the ' `
<br /> laboratory analysis
<br /> Analytical results of the ground water samples are summarized in Table 2 The laboratory reports
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<br /> Adi'axcedGeoEnNironmental,Inc
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