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lie 21 October 2002 <br /> AGE-NC Project No 98-0426 <br /> Page 2 of 3 <br />' 'McCampbell Analytical,Inc (MAI),a Cali form a Department of Health Services-certified laboratory <br /> The samples were analyzed for <br />' Dissolved lead in accordance with EPA Method 200 9, and <br /> • 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br />' 3.0. FINDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field, the <br />' hydrocarbon Impact to ground water was quantified by the laboratory data obtained from the ground <br /> water samples <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 23 58 feet to <br /> 24 70 feet as measured from the top of the well casings Ground water elevations at the site ranged <br /> from 14 09 feet below mean sea level(MSL)in MW2 to 14 33 feet below MSL in MW5,the ground <br /> water elevation at the site decreased an average of 102 feet between the May 2002 and August 2002 <br />' monitoring events Ground water was within the screened Intervals In all five wells <br /> i <br /> The ground water gradient was calculated to be approximately 0 004 ft/ft with a north-northeasterly <br /> flow direction The ground water elevation contours are depicted on Figure 3 <br /> 1 <br />' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Dissolved lead was not detected above laboratory reporting limits in the samples collected from the <br />' five on-site monitoring wells 1;2-DCA was detected in the groundwater sample collected from well <br /> MW5 at a concentration of 0 77 microgram per liter (µg/1) 1,2-DCA was not detected above - <br /> laboratory reporting limits in the samples collected from wells MW1 through MW4 EDB was not <br />' detected In wells MW1 through MW5 <br />' .The current and historical ground water analytical results are summarized on Tables 2 and 3 The <br /> laboratory report(MAI Lab IDs 0208144-001 through 0208144-005),chain-of-custody form and the <br /> laboratory QA/QC report are included in Appendix C <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />