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' The initial round of sampling, March 3, 1987, showed benzene concentrations of 3.5 ug/l (ppb) in MW-1 and 13 ug/l (ppb) in MW-2. BTEX constituents were not detected in samples collected from MW-3, and TPH was not detected in samples from all three wells Analytical results of ground water samples collected April 28, 1988 indicated BTEX and TPH constituents were not present in the wells. Conclusions Based on the analytical results from the two consecutive rounds of water samples collected after March 1987, ground water contamination no longer appears to be present at this location. It is our judgment that removal of the old underground tanks and soil remediation at this site have removed the probable source for ground water contamination It is Kleinfelder's recommendation that no further remedial action or sampling be required at the site. These assertions are based on the three rounds of ground water sampling at this site. Should a greater degree of certainty be required by the client, Kleinfelder should be notified for additional ground water sampling and consultation. This report has been prepared in general accordance with the accepted standard of care which exist in Northern California at the time the sampling was performed it should be recognized that definition and evaluation of hydrogeologic conditions is a difficult and inexact art Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the subsurface conditions present More extensive studies including additional subsurface investigation may reduce the inherent uncertainties associated with subsurface modeling. • Very truly yours, KLEINFELDER Eric S. Findlay Project Geologist Kent E. Zen is .E Senior Enviro ental Engineer Registered Environmental Assessor Environmental Services Division Central Valley Group ESF:rp Attachments 113-88-905 KLEI\FELD£R 9795 Business Park Drive Suite C, Sacrarnen o CA 95827 (916) 366-1701