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<br /> 08 January 2004
<br /> AGE-NC Protect No 95-0103
<br /> Page 5 of 8
<br /> • 24 November 2003 Grab groundwater samples were collected from the four extraction wells
<br /> during pumping with the following concentrations EW-1 TPH-g at 410 µg/1, benzene at
<br /> 12 µg/1, toluene at 8 0 µg/l, ethylbenzene at 9 0 µg/l, and xylenes at 41 pg/l, EW-2 TPH-g
<br /> at 910 pg/l, benzene at 90 lag/l, toluene at 11 µg/l, ethylbenzene at 72 µg/l, and xylenes at
<br /> 93 µg/1, EW-3 TPH-g at 2,100 µg/1, benzene at 30 µg11, toluene at 16 µg/1, ethylbenzene at
<br /> 270 µg11, and xylenes at 560 µg/l, VW-6 TPH-g at 2,200 µg11, benzene at 66 µg11, toluene
<br /> at 21 µg/1, ethylbenzene at 320 µ.g/1, and xylenes at 450 µg/l
<br /> 0 15 December 2003 Grab groundwater samples were collected from the four extraction wells
<br /> during pumping with the following concentrations EW-1 TPH-g at 910 µg/l, benzene at
<br /> 9 5 µg/l, toluene at 3 9 µg11, ethylbenzene at 3 4 µg/1, and xylenes at 2 7 µg/l,EW-2 TPH-g
<br /> at 2,400 µg11, benzene at 39 µg/l, toluene at 8 1 µg/1,ethylbenzene at 11 µg/1,and xylenes at
<br /> 45 µg/l,EW-3 TPH-g at 7,100 µg`/l,benzene at 550 µg11; toluene at 52 µg/1, ethylbenzene at
<br /> 22 1-tg/1, and xylenes at 910 µg11, VW-6 TPH-g at 6,200 µg/l, benzene at 51 µg/1, toluene at
<br /> 29 µg/l, ethylbenzene at 330 µg/l, and xylenes at 400 µg/1
<br /> TPH-g/d BTEX compounds and MTBE were not detected in the effluent ground water treatment
<br /> samples analyzed The analytical results are summarized in Table 4, laboratory reports are provided
<br /> in Appendix C
<br /> 3 12 Volume-Mass Removal Calculations
<br /> During the fourth quarter 2003,an estimated 0 2 lbs of benzene and 6 67 lbs ofTPH-gwere extracted
<br /> from ground water Fourth quarter 2003 volume-mass calculations from the ground water treatment
<br /> system are presented in Appendix D
<br /> 1 ` j
<br /> 3 2 GROUND WATER MONITORING RESULTS
<br /> Ground water elevation and flow direction were determined from field data Hydrocarbon-impact to r '
<br /> ground water was quantified from laboratory analysis of the ground water samples
<br /> 3 2 1 Ground Water Elevations and Gradient
<br /> t
<br /> Depth to ground water at the site ranged from 14 99 to 17 19 feet below the top of the well casings
<br /> The ground water elevations ranged from 9 91 (MW-6) to 10 49 feet (MW-3) below sea level
<br /> Ground water elevation dad not change over the quarter (Table 1) The ground water flow direction
<br /> was southeast, iadlally Inward toward the area of well EW-3 at the western portion of the site,
<br /> ground water flow in the Innmedlate vicinity of the site is inferred to be controlled by the ground
<br /> Advanced GeoEnvironmental,Inc
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