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�,• r �`$., ! 4 - � ..= 1 t 1 !4 ,'`• ' ` r' ' ,, it �'d ? i, <br /> li <br /> 2LApri12003 <br /> AGE-NC Project No 95-01,14 ! <br /> Pag e'4 of 5 <br /> ' 4.0. SUMMARY AND CONCLUSION , <br /> Based upon-the results of the investigation, AGE concluded that: <br /> ,Ground water depths, within the established,monitoring wells were between 24.89 and ' y <br /> 26.41 feet'below the tops of the.well casings; ground water flow direction was northeast at <br /> 10 <br /> a gradient of approximately 0.002 feWfeet.Historically,the ground water flow.doniinantly <br /> 1 <br /> has been between north-northwest and.northeast. <br /> • Monitoring wells MW-•1 through MW-5 at or near the site are "drowned"with'well screen, , _ <br /> ' intervals as much as' 10 feet below present groundwater surface. Samples collected,from <br /> these wells may not be representative of ground water.conditions at the top of the saturated ' <br /> capillazone, where the greatest non-chlorinated'hydrocarbon impact to:ground water is <br /> ry <br /> often encountered. The more recently installed wells were screened across the current-water <br /> table level. Note that wells MW-8and,MW-9 are located near wells MW-1 and MW-2. <br /> ' • , TPH-ss was detected in-the on-'site monitoring wells MW-3, MW-6;MW-7 and MW-9 as <br /> well as off-site well MW-10. <br /> • The BTEX compound ethylbenzene was detected in on-site well MW-9. <br /> • Detected concentrations of PCE in samples MW74;MW-6,MW-7 and MW-10,and TCE in <br /> samples MW-6 and MW-10 exceeded the DHS' Maximum Contaminant Levels(MCLS)in <br /> ' drinking•water. Detected concentrations of cis'1,2-DCE, 1,2-dichlorobenzene, and vinyl <br /> chloride also exceeded their respective MCL. <br /> The lateral extent ofthe dissolved halogenated-hydrocarbon and stoddard plume has not been <br /> defined eastof well MW-10. A map'of dissolved TPH-ss and the VOCs.PCE/TCE, cis-1,2- <br /> �' DCA and vinyl chloride is depicted in Figure 2. = <br /> ' 5.0. , RECOMMENDATIONS <br /> Based upon the results of the investigation, AGE recommends: <br /> Continuedground water monitoring; the next ground water monitoring event should be. <br /> Y scheduled.for March 2003. <br /> • Installation of additional ground water monitoring,wells.cast of well MW-10 to assess the <br /> northeastern extent.ofthe chlorinated solvent and stoddard plume. <br /> Advanced Ge.oEnvironmental,Inc, �' ' <br />