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19 April 2004 <br /> AGE-NC Project No. 95-0185 <br /> 1 Page 3 of 4 <br /> 3.0. FINDINGS <br /> r m h field data. <br /> The ground water elevation, gradient and flow direction were determined fro the , <br /> Contaminant impact to ground water was assessed by field observations and laboratory analysis. <br /> 1 <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 1 - <br /> During the January 2004, first quarter sampling event, the depth to ground water ranged from <br /> ' 24.26 feet (MW-4) to 25.70 feet (MW-5) below casing grade; free product was detected in well <br /> MW-4,but was too thin to measure. Ground water elevation,based on the measurements collected <br /> with the Solinst and free-product probe during Januaryranged from 34.87 feet(MW-5)to 35.74 feet <br /> ' (MW-4) above mean sea level (MSL). Based on the January data of ground water elevations from <br /> wells MW-1 through MW-5, the ground water flow was inferred to flow radially,towards the <br /> southwest from well MW-2 at a gradient of 0.007 ft/ft, and towards the west-northwest from well . <br /> ' MW-4 at a gradient of 0.01 fl/ft. <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 MW-4 <br /> ' and MW-5 at concentrations of 29,000 micrograms per liter (µg/l), 210,000 µg/l and 3,300 µg/1, <br /> respectively. TPH-g was detected in samples MW-1 and MW-4 at concentrations of 2,200 µg11 and <br /> 7,000µg/1.BTEX compounds and fuel additives were not detected in the analyzed samples.Current <br /> ' and previous analytical results are summarized in Tables 2 and 3. The laboratory report (CTEL <br /> Laboratory I.D.0401189),quality control and quality assurance,data(QA/QC)and chain-of-custody <br /> ' form are included in Appendix C. <br /> ' 4.0. CONCLUSIONS <br /> Based on the data collected during the January 2004 monitoring period, AGE concludes: <br /> ' • Free product has been present intermittently in wells MW-1 and MW-4 since the June 2002 <br /> ground water monitoring event. <br /> ' Ground water was inferred to flow radially,towards the southwest in the area of MW-2 and <br /> towards the northwest in the area of MW-4. The ground water gradient ranged between <br /> 0.007 ft/ft in the area of MW-2 to 0.01 ft/ft in the area of MW-4. However, the presence of <br /> ' free product in well MW-4 may influence ground water flow directions due to small variations <br /> . in ground water measurements. <br /> Advanced GeoEnviron mental,Inc. <br />