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8 August 2000 <br /> AGE-NC Project No 95-0143 <br /> i Page S of 8 <br /> included in Appendix F <br /> 3.0. FE%DH4GS <br /> Ground water elevation and flow direction were calculated from field data, the hydrocarbon unpact <br /> to soil and ground water was inferred from laboratory analysis and field observations The <br /> approximate mass of hydrocarbons removed by soil vapor extraction was calculated <br /> 3 1 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> TPH-g,TPH-d,TPH-mo,BTEX and volatile organic compounds including MTBE were not detected <br /> in samples analyzed from soil probe borings 16B-6 and 16B-7 <br /> Lead was detected in samples collected from soil probe borings 16B-6 and 1613-7 ranging from <br /> concentrations of 2 6 ppm to 5 0 ppm Analytical results of soil samples are summarized on Table <br /> 4 The laboratory report (Curtis and Tompkins, Ltd Lab ID Nos 14548-001 through 145486-006) <br />. and chain-of-custody forms are included in Appendix B <br /> 3 2 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLES <br /> Grab ground water samples were collected during the May 2000 soil probe boring event Four grab <br /> ground water samples were collected from borings 16B-6 and 16B-7 TPH-d was detected m grab <br /> grater sample 16B-7-GW at a concentration of 110 micrograms per liter(gg/l) Samples 16B-6-GW <br /> and 16B-7-GW contained concentrations of lead at 48 gg/l and 100 µg/1 , respectively Analytical <br /> results of`grab' groundwater samples are summarized on Table 5 The laboratory report (Curtis , <br /> and Tompkins,Ltd Laub ID Nos 145485-0007 through 145485-010)and sham-of-custody forms are <br /> included in Appendix B <br /> 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to water from the <br /> surveyed casing elevation(Table 1) Between February 2000 and May 2000,groundwater elevations <br /> decreased in eight of the nine wells an average 0 86 feet Ground water in MW-3 increased in <br /> elevation 0 62 feet During the May 2000 monitoring event, ground water ranged from 1 40 feet to <br /> 10 4 feet above the screened interval in the nine monitoring wells Ground water was within the <br /> Advanced GeoEnvironmental,Inc <br />