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<br /> s 29 August 2001
<br /> S' AGE-NC Project No 96-0235
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<br /> 18 46 feet below the tops of the well casings Ground water elevations at the site ranged from -9 88
<br />' feet in MW-5 to -12 01 feet mean sea level(MSL)in MW-2 Ground water elevation decreased an
<br /> average of 0 5 P feet in the wells
<br />' To infer ground water flow direction, the ground water elevation data was divided into two sets
<br /> based on the well screen intervals Ground water was between 21 54 and 23 55 feet above the
<br />' screened intervals in monitoring wells MW-1, MW-2, MW-6B, MW-8B, MW-9, MW-11B,
<br /> MW-12B and MW-13B comprising the deeper water data set Groundwater was within the screened
<br /> intervals of wells MW-5,MW-6A,MW-7, MW-8A, MW-10,MW-1 IA, MW-12A, MW-13A and
<br /> EW-1, comprising the shallow water dataset Ground water was approximately 13 07 feet and
<br /> 1196 feet above the screened interval in MW-3 and EW-2, respectively MW-3 and EW-2 are
<br /> screened between the shallow and deep ground water'Figure 3 illustrates the groundwater elevations T
<br />' based on the two data sets Ground water flow direction near the former UST cluster was inferred
<br /> to be toward the east-northeast using data from wells screened within the upper interval and toward
<br /> the east-southeast using data from wells screened within the lower interval Ground water flow
<br />' direction near the farmer UST No 3 excavation was inferred to be flowing radially toward the south
<br /> using data from wells screened within the upper interval and toward the south-southwest using data
<br /> from wells screened within the lowcn interval The inferred ground water gradient in the shallow
<br />' zone was 0 0019 ft/ft near the former UST cluster and 0 0004 ft/ft near the former UST No 3
<br /> location The inferred ground water gradient in the deep zone was 0 0017 ft/ft near the former UST
<br /> cluster and 0 0125 ft/ft near the former UST No 3
<br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES
<br /> TPH-gwas detected in the samples collected from MW-1,MW-2,MW-9,MW-10,MW-11 B,EW-1
<br /> and EW-2 at concentrations as high as 38,000 micrograms per liter (µg/1) in the sample collected
<br />' from EW-1 TPH-d was detected in samples collected'from MW-1, MW-2, MW-10, MW-11B,
<br /> MW-13B, EW-1 and EW-2 at concentrations as lugh as 11,,000 µg11 (MW-10) Various BTEX
<br />' compounds were detected in samples from 10 of the 20 wells at concentrations as high as 1,600 µg/1
<br /> u benzene (MW-1), 6,100µg/1 toluene (EW-1), 1,700 µg/1 ethylbe`nzene (EW-1) and 7,500 µg/1
<br /> -- xyldnes (EW-1) _
<br /> MTBE was detected in the water samples collected from MW-9, MW-10, MW-11B, MW-12B,
<br /> MW-13A, MW-13B and EW-1 at concentrations ranging from 17 µg/1 to 280 µg/1 Water samples
<br /> analyzed from MW-1, MW-2, MW-5, MW-6A, MW-6B, MW-7, MW-11B, MW-12B, EW-1 and
<br /> EW-2 contained detectable concentrations of 1,2-DCA ranging from 1 3 µg/1 to 66 µg/1 EDB was
<br /> detected in the sample collected from EW-1 at a concentration of 4 9 µg11 Analytical results of water
<br />' samples collected during the second quarter of 2001 are summarized on Table 2 and 3, analytical
<br /> results from previous monitoring events are summarized on Tables 4 and 5 Figures 4 and 5 illustrate
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<br /> Advanced GeoEnvironmenYai,Inc
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