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10 January 2001_ - - - -- <br /> AGE-NC Project No 98-0521 <br /> ' _ = Page 6 of 7 <br /> I <br /> Analytical results from the monitoring well ground water samples are summarized in Table 3 The <br /> I ' laboratory report (MAI Lab ID Numbers 47029 through 47031 and 51176),QA/QC and chain-of- <br /> custody are included in Appendix C <br /> 4 3 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> - On the 07 September and 20 October 2000, the depth to ground water at the site ranged from 8 05 <br /> to 8 45 feet and 8 19 to 8 44 feet below the tops of the well casings, respectively (Table 4) <br /> ' The ground water elevations at the site ranged from -7 73 feet to -8 12 feet mean sea level (msl) and <br /> -7 87 to -8 14 feet msl, on the respective dates The ground water flow direction and gradient were <br /> calculated from the well elevation data - <br /> The ground water flow was directed toward the-northeast The ground water hydraulic gradient was <br /> ' calculated to be 0 004 feet/feet Figures 3 and 4 illustrates the contoured ground water elevations as <br /> measured these dates <br /> 50 _ SUMMARY AND CONCLUSIONS <br /> ' The following conclusions were drawn from the results of this investigation <br /> - u • Ground water at the site was encountered at approximately 8 5 feet bsg The prevailing <br /> ground water flow direction at the site is generally toward the northeast The ground water <br /> hydraulic gradient was estimated to be 0 004 feet/feet <br /> ' 40 Low concentrations of petroleum hydrocarbons and fuel additives were detected the two soil <br /> samples collected from the pilot boring for MW4 within the former UST excavation <br /> •' Dissolved phase hydrocarbons, including TPH-g, BTEX and oxygenates, are present at significant concentration in the sample from well MW-4, within the former UST area <br /> Hydrocarbons were encountered in the down-gradient direction from the former UST area <br /> ' to the location of monitoring well MW-2 <br /> - - Analytical data from the initial site assessment Indicates that remediation of ground water <br /> may be required at the site Additional site assessment, well installation and sampling will <br /> be required to fully assess-the down-gradient extent of the dissolved hydrocarbons <br /> • r - _ L- - - - _ -� - J Advanced GcoEnrlronmental,Inc <br /> I - _ <br />