ARCHIVED REPORTS XR0000971 - Laserfiche WebLink

Home Browse Search

A. ' 1.5 January 1.999 - • _ • � - r, ,. , ,' . • , AGE-NC Project No. 98'-0440 - ' Page 4 of 4 • Various BTE&X compounds were detected'in water samples collected from,wells,MW-1, ' MW-2 and MW-4 at concentrations ranging between 0.70=,ug/1 and'.1,2W ug/1. - Concentrations of benzene detected in samples.collected'from wells MW-2 and.MW-4 were _ above the State of California Maximum Contaminant Level (MCL) for drinking water of 1.0 ppb. • 'MTBE was not detected from laboratory analysis of any ground water samples.. •. Fuel oxygenates,w,ere not detected by laboratory analysis of any ground water samples. • The elevated concentrations of petroleum hydrocarbons detected in samples collected from, I wells MW-2--indicate that this well is within or near the dissolvedetroleum h drocarbon core area" of the plume• i p Y ' The horizontal extent of impacted•ground water has not been delineated to the northeast. 5.0.- RECOMMENDATIONS • Based•upon the results of this investigation, AGE recommends: • Continued quarterly ground water monitoring. The,next.quarterly`monitoring and sampling is scheduled for Januar 1999. • ''Preparation of a Work.Plaii Addendum to assess dissolved petroleum hydrocarbons northeast ' of"MW-2. . - ; I' 6.0. LIMITATIONS - Our professional services ��ere per formed using"that degree of care and skill ordinarily exercised by environmental.consultants practicing in this or similar localities. The findings were based.upon analytical results provided by an independent laboratory and a well-casing,'ele'vation' survey' �. . performed by an independent sub contractor. Evaluations of the,geologic/hydrogeologic conditions at the site far the purpose of this investigation.were made from a limited number'of available'data , .points.(i.e..monitoring well-groundwater samples); and,subsurface conditions may vary away from these. 'data paints: •No other warrant expressed or im lied is made as to the professional Y p p 'recommendations contained in this report: Advanced GeoEnviron mental,Inc.