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10 <br /> March 2003 <br /> AGE-NC Project No 95-0185 <br /> Page 3 of 4 <br />' DR,= Corrected depth to water <br /> D,=Measured depth to water <br /> t,:= Total thickness of free product <br /> dg= Density of free product (diesel at—0 8$ g/ml) <br /> dH,= Density of water (-1 0 gn-i/ml) <br />' Groundwater elevation,based on the measurements collected with the Solinst product probe,ranged <br /> from 35 93 feet (MW-4) to 36 06 feet (MW-5) above paean sea level (rnsl) Based on the ground <br />' water elevations from wells MW-1 through MW-5, the ground water flow was inferred to radiate <br /> inward from southeast to northeast at gradients of 0 002 ft/ft and less <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-d was detected in ground water samples collected from ground water samples MW-1 and <br /> MW-4 at concentrations of 20,000 micrograms per liter(p,g/1) and 93,000 µ.g/1,respectively TPH-g <br /> was detected in samples MW-1 and MW-4 at concentrations of 1,400 p.g/1 and 6,700 µg/l, <br />' . respectively In addition, the BTEX compounds ethylbenzene, toluene and total xylenes were <br /> detected in sample MW-4 at concentrations of 1 8 µg/1, 2 1 µg/1 and 8 4 µg/l, respectively <br /> No other target analytes were detected In the analyzed samples Current and previous analytical <br /> results are summanzPd in Tables 2 and 3 The laboratory report(CTEL Laboratory I D Nos 00102- <br /> 059-01 to -05), quality control and quality assurance data(QA/QC) and chain-of-custody form are <br /> included in Appendix C <br /> 4.0. CONCLUSIONS <br /> Based on the data collected during this monitoring period, AGE concludes <br /> • Ground water flow at the time of the February 2003 ground water monitonng event was <br /> inferred to be radiating inward from southeast to northeast, at a gradient of approximately <br /> 0 002 ft/ft Due to the low ground water gradients at the site, small variations in ground <br /> water measurements caused by the presence of free product could modify the inferred <br /> ground water flow direction <br />' The concentrations- of TPH-d and TPH-g,mcreased- m well MW-1, but decreased <br /> significantly in well MW-4 TPH-d was not detected in wells MW-2 and MW-3 during the <br />' first quarter 2003 Ground water does not appeared to be impacted in the area of-well.MW-2, <br /> MW-3 nor MW-5 <br /> • Free product has been present in wells MW-1 and MW-4 since the June 2002 ground water <br />' monitoring event <br />' Advanced GeoEnvironmental,Inc <br />