Laserfiche WebLink
,t'4Y`4 -r•ar T 'u _r t- - r + i, _il, i._ r..Vril_t �; !,,- -..'ti lral II'.'! w W1vwl.+,'- -..i` r� <br /> T. I , : <br /> I �NC I rl •I' h ' _` r a , Y I 1 1F a y ' i.' (tn fix.., chr,�h�.„r <br /> July 2003 <br /> AGE�NC Pzoject No. 95.01 14 <br /> I <br /> ",q Page <br /> GEL-' <br /> n' <br /> 24:47 feet below'the tops of the'well casings; ground water.flow,directioh w'as northeast'at 1 '' <br /> a gradient of approximately.0.0013 feet/feet.Historically;the ground water flow dominantly; <br />' has,been Between north-northwest Wand northeast. ; • ° ' <br /> • ; Monitoring wells,MW-1 through.lVlW-5 are `.`drowned"with well screen intervals as much <br /> as 10 feet'below present ground water surface. Samples collected from these wells may not ' <br /> be representative of ground water.conditions,at the.top of the saturated capillaryzone,,where° t <br /> the greatest non-chlorinated hydrocarbon impact to ground water is,often encountered.'The. <br /> more recently installed wells were,screened across,the current water table level:.Note,thAt <br /> wells MW-8 and 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 /> Ehylbenzene was only`detected in well MW-9. No BTEX were detected_ in the remaining i <br /> Wells., <br /> ' • ' Detected concentrations ofPCE in samples MW-4,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'vihyl <br /> chloride respective MCL.also exceeded their res ! <br /> r p <br /> • The lateral extent of the dissolved halogenated-hydrocarbon and stoddard plume has been ' <br /> defined east of well MW-10 (Figures 4, 5 and 6). <br /> 5.0.- RECOMMENDATIONS <br /> Based upon the results of the investigation,AGE recommends, <br /> • Performance of soil vapor sampling for VOC's. ` <br /> Installation of additional ground water monitoring wells northeast of well MW=10, 6.assess ; <br /> the northeastern extent of the chlorinated solvent and'stoddard plurrie. ' <br /> • Continued ground water:monitoring. The'next ground water monitoring event should be <br /> scheduled after the monitoring well installation: <br /> , • -- � •. - II SSI .,' <br /> Adv"eed GeoEnvironr6entat,inc <br />