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r' i .t' .t „r v a .'', _i. , _ r f .•s r - 4! <br /> 1, t <br /> 18 <br /> Marc' - - • y a � .. ' � '; -r 'r r t F.., , <br /> 4 h 2002 y <br /> AGE=NC Project No 95 0114 <br /> +. . Page;4 of 4. <br /> ' - was detected in-the down gradient, ground water monitoring,wells at the eastern edge and <br /> off-site(MW-7 and MW-10). Very low concentration of•BTEX compounds were detected <br /> in two"of the on-site ground water samples.' <br /> PCE arid,TCE were detected in thewater samples collected from wells MW6,1VIW7.and well <br /> IVIW-10; located off-site, at concentrations,which,exceeded the Maximum Contaminant <br /> Level.(MCL) of 5 ggll established by'the' State of California.- 'Department of Health <br />,1 Services.Detected concentrations ofcis 1,2-dichloroethene and vinyl chloride also exceeded <br /> • their respective MCL,':. - - <br /> • The lateral extent of the dissolved halogenated-hydrocarbon plume has not been defined east <br /> or north of wells MW-6 and MW_10. Amiap of dissolved TPH-ss and VOCs is depicted in <br /> Figure 2. ' <br /> 5.0. RECOMMENDATIONS ' <br /> Based upon the results of the investigation, AGE recommends: <br /> '.. • The next ground water monitoring event should be scheduled for May 2002. <br /> • Installation'of cone penetrometer testing soil borings to define and characterize the local . <br /> hydrologic units and the vertical extent of impacted soil and ground water. - <br /> • Installation of the approved additional ground water monitoring wells to assess the <br /> chlorinated solvent plume off-site toward the.northeast. <br /> 6.0. <br /> LIMITATIONS, , <br /> :. Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> 1 environmental consultants practicing in this or similar localities.The findings were based mainly on <br /> analytical results provided by an independent laboratory. Evaluations of hydrogeologic conditions <br /> at the'-site for the purpose of this investigation are made from a limited number of data points (i-,e., <br /> ' soil samples,monitorin well groundwater samples),and subsurface conditions may vary away from <br /> these points.-No other.warranty,expressed or implied,-is made as to the professional interpretations, . <br /> '. ., opinions and recommendations contained in this report. <br /> „ Advanced GeoEnvironmental,Inv ' <br />