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22 February 2000 <br /> AGE-NC Project No 95-0128 <br />' Page 3 of 5 <br />' three drowned wells was approximately 0 0016 ft/ft,the gradient for the four properly screened wells <br /> was approximately 0 0018 ft/ft <br />' 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br />' MAI received, extracted and analyzed the ground water samples on 02 February 2000 MAI issued <br /> a report dated 10 February 2000 The analytical results from the 31 January 2000 ground water <br /> samples are as follows <br />' 0 TPH-g, TPH-d, and the BTEX compounds were not detected in the ground water sample <br /> from the drowned well MW1 Low concentrations of TPH-d was detected In the samples <br /> from drowned wells MW2 and MW3,340µg and 77µg/1,respectively In addition, 0 58µg/1 <br /> toluene was detected in the sample from MW3 <br />' 0 Dissolved petroleum hydrocarbons were detected in samples from all the properly screened <br /> monitoring wells (MW4 through MW7 and VW1) The sample from MW7, the up-gradient <br /> well, contained only 120µg/1 TPH-d In general, the highest concentrations of hydrocarbons <br /> were detected in the water sample from monitoring well MW4, which contained 35,000µg/1 <br /> TPH-g, 4,900 µg/1 TPH-d, 51 µg/1 benzene, 73 µg/1 toluene, 1,900 µg/1 ethylbenzene and <br /> 7,700µg/1 total xylenes The sample from MW5 contained more benzene and toluene than <br />' the MW4 sample, with 370 µg/l benzene and 420 µg/l toluene The lowest suite of <br /> hydrocarbon concentrations were detected in the sample from monitoring well MW6, which <br /> contained 150 µg/1 TPH-g, 1 5 µg/l benzene, 0 78 µg/1 toluene, 5 8 µg/1 ethylbenzene and <br />' 22 µg/l total xylenes The MW4 sample had less than a detectable concentration of TPH-d <br /> this quarter <br />' 0 TPH-d was detected in samples from all the properly-screened monitoring wells, except <br /> MW6, at concentrations as high as 4,900µg1l(MW4),but was not detected in samples from <br /> the deeper-screen wells MW 1 or MW2 A low concentration was detected in the sample from <br />' the deeper screen MW3, as noted above <br /> • MTBE was detected in all ground water samples collected Detected concentrations of <br /> MTBE ranged from 1 3 µg/l (MW1) to 600µg/l (MW5) <br /> • TBA was not detected in any samples this quarter, however, the detection limit vaned from <br /> 10 yg/l to 100 µg/1 for samples collected from MW5, MW7 and VW1 <br /> • DIPE, TAME, and ETBE were not detected in the ground water samples collected during <br /> the 31 January 2000 ground water monitoring event <br /> I <br /> Advanced GeoEnvironmental Inc <br /> I <br />