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elevated levels of diesel fuel No detections of diesel fuel or any other contaminants of concern (COC) were made outside the former tank pit location ' 7.0 CONCLUSIONS Based on the above findings, Avalon concludes the following ' The detections of MTBE in the borings located north of the northern tank farm area suggest a northern groundwater gradient, and that the impacted groundwater is migrating to the north e • The detections of the more mobile constituents of gasoline, MTBE and benzene only, in the northern tank area suggests that higher concentrations of TPH gasoline may exist in the center of the former tank farm pit Due to ongoing construction in that area, the center could not be drilled ' The detections of diesel and low levels of MTBE in the former southern diesel tank pit indicates that a release impacting groundwater has occurred • The lack of detections of CDCs in any e borings of thbg surrounding the southern diesel tank area indicate that the release was limited in extent, and that the vertical and horizontal extent of Impact has been defined ' 8.0 RECOMMENDATIONS • Additional characterization is needed in the northern tank area to fully ' define the horizontal extent of contamination of both MTBE and benzene • Since the vertical and horizontal area of impact has been defined in the southern tank area, we recommend no further study of that area • The groundwater gradient should be established by placing permanent ' groundwater monitoring wells on the subject property • This report should be forwarded to the SJCEHD Site Mitigation Unit with a ' request for their review and comments ' 9.0 ASSESSMENT LIMITATIONS The scope of this report is limited to the matters expressly covered This report is Iprepared for the sole benefit of Kashmir and Dalwidner Dhoot, and may not be Avalon Environmental Consultants Kashmir&Dalwidner Dhoot 20 Corporate Plaza 9627-001-1 Newport Beach,California 10 15600 5 Harlan Road I