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' 20 September 2000 <br /> AGE-NC Project No 97-0333 <br /> ' Page 10 of 11 <br /> • Ground water flow direction at the site appeared to be oriented generally north at a gradient <br /> ' of 0 001 on 11 July 2000 (Figure 10) Due to the low gradient at the site, slight variations <br /> in ground water measurements or changes of recharge/discharge of the local ground water <br /> could greatly modify the modeled ground water flow direction <br /> • The ground water elevation at the site was within the screened intervals of wells MW-1, <br /> ' MW-2, MW-3, MW-4 and MW-5 and yield samples representative of shallow ground water <br /> conditions <br /> • Laboratory analysis of ground water samples indicates that the constituents of concern are <br /> ' TPH-g, BTEX, MTBE and TAME <br /> • Very high concentrations of dissolved MTBE,TPH-g and BTEX compounds were quantified <br /> in the area of monitoring well MW-2, moderate to high concentrations of MTBE,TPH-g and <br /> BTEX compounds were quantified in the area of monitoring wells MW-1, MW-3 and <br /> MW-4 <br /> ' A substantial concentration of TAME was detected in ground water from the area of MWA <br /> • The areal distribution of dissolved contaminants suggests a narrow, elongated ground water <br /> ' plume Based on TPH-g and MTBE isoconcentration maps of the ground water data collected <br /> uli I I July 2000, ihc, area of impacted ground water appears to extend at least 210 feet by I t U <br /> feet, the northwest, north and northeast and south extent is uncertain <br /> ' 6 `Mie horizontal extent of fuel oxygenated and petroleum hydrocarbon-impacted ground water <br /> is not known in any direction <br /> ' The vertical extent of fuel oxygenate and petroleum hydrocarbon-impacted ground water has <br /> not been delineated at the site <br /> I A sensitive receptor survey report was submitted to the PHS-EHD on 08 September 2000, <br /> the results of the survey located an operational municipal drinking water well at 331 Jessie <br /> Avenue, approximately 1,500 feet south of the site and a non-operational municipal water <br /> well located approximately 1,900 feet northwest of the site near the intersection of Almond <br /> Avenue and Hemlock Avenue <br /> 50 RECOMMENDATIONS <br /> ' BasLd upon thi. results ofthc third Quarter 2000 in%cstigation, AGE recommends <br /> ' C ontinucd yuar-teily ground water monitoring utilizing wells MW-I, MW-2, 'VIVO -3, MW-,- <br /> and <br /> W--and MW-5 for chiractcriiation of ground \4ater conditions on the. site., the next cluartLrly <br /> Idl Q17E(fj lel Oi II\il fl 11[Ilk lllJS illi <br />