ARCHIVED REPORTS XR0010273 - Laserfiche WebLink

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_ EN Cit. Ms. Evelyn Hubel November 2, 1999 Page 3 hydrocarbon impacted soil was transported to Forward Inc. Landfill in Manteca, California for disposal. Copies of the non-hazardous waste manifests are included in Attachment 4. Conclusions and Recommendations Soil impacted by petroleum hydrocarbons was encountered during the course of excavation and grading activities conducted onsite in association with site redevelopment. Soil impacted by petroleum hydrocarbons was encountered to the north and northwest of the former Discovery Chevrolet service bay building. Excavation and offsite disposal of approximately 177 tons of impacted soil was conducted in June and September 1999. Impacted soil was transported and disposed of as non-hazardous waste at the Forward, Inc. Landfill in Manteca, California. Soil verification samples and field observations of staining and volatile petroleum hydrocarbons made during the excavations provided verification that the majority of the soil impacted by petroleum hydrocarbons had been removed and only minor residual concentrations of petroleum hydrocarbons remained in soil onsite in the excavated areas north of the former Discovery Chevrolet service bay building. Based on the results of verification sampling and field observations made during excavation, ENSR recommends that no additional remedial excavation be conducted onsite north of the former Discovery Chevrolet service bay building. ' Study Limitations This report describes the results of ENSR's excavation and disposal of soil impacted by petroleum hydrocarbons beneath the subject site. In the conduct of this investigation, ENSR has attempted to independently assess the potential presence of such a problem within the limits of the established scope of work as described in our proposal. This report and all field data and motes where gathered and/or prepared by ENSR in accordance with the agreed upon scope of work and generally accepted engineering and scientific practice in effort at the time of ENSR's investigation of the sites. The statements, conclusions, and opinions contained in this report are only intended to give approximations of the environmental conditions at each site. Moreover, there are several major modifications that are inherent in the conduct of this or any other environmental due diligence examinations. i It is difficult to predict which, if any of the potential environmental issues identified will become actual problems in the future. Federal and state environmental regulations continually change, as do the enforcement priorities of the applicable government agencies involved. Even for problems currently identified, it is often difficult and sometimes impossible to accurately estimate the liabilities that may be involved in remedying the problems). The legal and technological standard for evaluating, remedying, environmental problems tends to be highly j dependent upon agency negotiations and the sometime arbitrary and unpredictable nature of agency officials charged with such negotiations. There is always the distinct possibility that major sources of future environmental liability have yet to manifest themselves to the point where they are reasonable identifiable through an external investigation such as the one conducted herein.