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%� t e <br /> h <br /> s <br /> 051VIay1'999 . r <br /> Y ` AGE-NC Project No. 95..0114 , <br /> Page 4`of5 <br /> ti. 4.0. SUMMARY AND CONCLUSIONS ' <br /> Based upon results of groundwater monitoring'and-well sampling, AGE concludes: ' <br /> Offer the past six months•the relative ground water elevation decreased approximately, 0'.'3' <br /> feet: <br /> ' : ;;° '• TPH=ss compounds were detected in the,samples fromwells MW-1, M' W-2'and MW-3, at <br /> concentrations as-great as 3;100 µg/1: <br /> r <br /> Benzene'was detected in only one kubple''(MW3)at a concentration equaling the,state MCL <br /> of <br /> Cis 1,2-dichloroethlene, detected in two,ground water Samples, exceeded the state MCL of- , <br /> 6 �ig/l in the sample collected from MW-3;•,which had a'concentration'of 470,ug/l. <br /> • `Vinyl chloride,concentrations exceeded the state MCL of 0.5 ,tzg/l iri groundwater samples <br /> collected from monitoring wells MW2 (0.6/'Y-g/1) and MW3 (1.30µg/1).' <br /> • ^ Low concentrations of two BTEX compounds were detected in the samples collected from <br /> MW-2 (xylene) and MW-3•(ethylbenzene and xylene). <br /> The chlorinated hydrocarbon compound PCE was detected in.the water sample collected <br /> from monitoring well MW-3 at'a concentration which exceed their Maximum Contaminant <br /> ' LeveIs (MCLS) of 5 ,ug/l established b the State•of California - De artment -of Health <br /> Y p. <br /> Services. <br /> ' . The eastern extent of the dissolved plume has not been delineated. <br /> • - 5.0. .'RECOMMENDATIONS : <br /> Based.upon the results of the investigation,.AGE recommends: <br /> • Establishment-of at least one•ground water Well at the eastern edge of;the property to assess. <br /> and monitor ground water contamination. <br /> ` . <br /> • The next quarterly.`ground water monitoring and sampling event should be scheduled for the <br /> second'quarter 1999. - <br /> ;Advanced GeoEnvironm_intal,113e.,- <br />