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25 August 1999 <br /> AGE-NC Project No 98-0448 <br /> Page 6 of 10 <br /> Petroleum hydrocarbon odor was detected in ground water samples collected from ground water <br /> monitoring wells MWA, MW-4A, MW-413, MW-5 and MW-7 <br /> I <br /> 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> During the June 1999 ground water monitoring event, depths to ground water In wells MW-1 <br /> through MW-8 were measured between 16 60 and 18 84 feet below the tops of well casings, ground <br /> water elevations were calculated to be between 8 05 feet and 9 43 feet below mean sea level Ground <br />' water elevation at the site decreased an average 0 53 feet between the March and June 1999 ground <br /> water morutoring events The ground water elevation data for MW-1 through MW-8 during the June <br /> 1999 ground water monitoring event Is depicted in Figure 3 <br /> IGround water flow direction for the area bound by wells MW-2, MW-3 and MW-5 through MW-8 <br /> A was generally toward the southwest at a calculated gradient of 0 007 ft/ft, or approximately 37 feet <br /> Iper mile (Figure 3), ground water flow direction for the area bound by wells MW-1 and MW-4 was <br /> generally toward the south-southwest <br /> I • Ground water was approximately 26 feet above the screened Interval in monitoring well MW-4B, <br /> therefore this well is"drowned", and will not yield a sample representative of shallow ground water <br /> 1 <br /> 3 4 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of six soil samples were submitted to a DHS-certified laboratory (McCampbell Analytical <br /> Inc ) for analysis as noted above TPH-g was detected In the 25-foot soil sample collected from soil <br /> boring EW-1 at a concentration of 310 milligrams per kilogram (mg/kg) <br /> BTEX compounds were detected in the 25-foot soil sample collected from EW-1 at concentrations <br /> ranging as high as 43 mg/kg, benzene was at a concentration of 5 8 mg/kg <br /> MTBE was detected in the 20-foot soil sample collected from EW-I at a concentration of 0 0076 <br />' mg/kg No other fuel oxygenated compounds were detected during the laboratory analysis of <br /> selected soil samples Analytical results of soil samples are summarized in Table 1 The laboratory <br />' report(McCampbell Analytical Inc Lab ID 13328 through 13335)and chairs-of-custody are Included <br /> in Appendix C <br />' Two soil samples (EW1-25 and MW8-25) were submitted for microbial enumeration and <br />' Advanted GeoEnnronmental,Inc <br />