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06 December 2000 <br /> 1 AGE-NC Project No. 95-0100 <br /> Page 5 of 6 <br /> ]] 3.3. RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative ground water elevation in each well was calculated by subtracting the ground water <br /> c depth from the surveyed casing elevations. The depth to ground water and the relative ground water <br /> F:a elevations are summarized in Table 1. <br /> Es) <br /> During the third quarter sampling event, the depth to ground water, as measured from the casing <br /> �.1 tops, ranged from 34.46 feet to 35.02 feet. The average relative ground water elevation decreased <br /> 2.26 feet for the third quarter. <br /> The prevailing ground water flow direction is to the north with an average gradient of 0.009. Relative <br /> ground water elevation contours are depicted in Figure 3. <br /> 3.4. ANALYTICAL/FIELD RESULTS OF GROUND WATER SAMPLES <br /> Water samples collected from the monitoring wells did not contain detectable concentrations of <br /> TPH-g or MTBE. The BTEX compound xylene was detected in the ground water sample from.MW- <br /> __ 2, at a concentration of 0.68 igll. Analytical results of groundwater samples are summarized in <br /> - Table 2. <br /> =� The laboratory report (MAI Lab ID 44667 to 44670); Quality Assurance and Quality Control <br /> (QA/QC) report and a chain-of-custody form are included as Appendix E. <br /> Dissolved oxygen concentrations were detected in monitoring wells MW-1,MW-2,MW-3 and MW- <br /> 6 as high as 58 %. <br /> 3.5. ANALYTICAL RESULTS OF SOIL SAMPLES <br /> Soil samples collected from the confirmation soil borings had detectable concentrations of TPH-g <br /> and various BTEX compounds. TPH-g were detected as high as 93 milligram per kilogram(mg/kg). <br /> :r Benzene was not detected in the soil samples collected and analyzed. However, other BTEX <br /> compounds were detected at concentrations as high as 0.52'mg/kg of xylene. Analytical results of <br /> soil samples are presented with previous analytical soil data collected from the site in Table 4. <br /> =' The laboratory report (MAI Lab ID 50354 to 50364), Quality Assurance and Quality Control <br /> (QA/QC) report and a chain-of-custody form are included as Appendix F. <br /> 3 <br /> -i Advanced GeoCnvironmental,Inc. <br />