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Bennett Properties December 28, 1987 Page 8 residual pesticides or herbicides. Such sources could cause localized contam- ination of the soil and/or upper water table. The potential for contamination of the deeper aquifers would depend on many factors, including type of contami- nant, amount released, when and where released, and site geology. Off site sources could include contaminant spills and leakage from under- ground tanks and pipelines. Contaminants could be carried to the site by groundwater, surface flow or by wind action, resulting in soil and/or ground- water contamination at the site. The Manteca Industrial Park lies upgradient of the site; one of its tenants could be a potential contaminant source. How- ever, no existing contaminant problems were identified by the governmental agencies contacted during our study, as discussed further below. The following agencies stated that they were not aware of any contamination problem at the site, or in the site vicinity: City of Manteca Planning Depart- ment, San Joaquin County Department of Environmental Health, Regional Water Quality Control Board - Central Valley Region, and the California Department of CHealth Services. DISCUSSION P,ND CONCLUSIONS Based on the information presented above, it does not appear likely that a significant contamination problem exists at the site. It is possible that small controllable amounts of contamination, due to on site sources such as materials dumped at the site, leakage from chemical and oil containers, spillage from trucks, septic tank leaks, or residual pesticides or herbicides could be pres- ent. However, we believe the likelihood of significant contamination from on site sources to be minimal. Based on the information provided by the various governmental and regula- tory agencies, contamination from off site sources also does not appear likely. The upper few inches of soil in the small areas where dead vegetation and oily smells were observed should be investigated by a limited sampling and chemi- cal testing program, consisting of one or two surface soil samples analyzed for total petroleum hydrocarbons. With "rush" laboratory turnaround, such an investi- gation could be completed in less than one week. We do not expect that extensive contamination will be found and we would expect mitigation costs to be low.