ARCHIVED REPORTS_XR0012636 CASE 1

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». a The dissolved-phase hydrocarbon constituents in the + ground water onsite appears to be limited to the northeast corner of the property extending towards Tracy Boulevard and Grant Line Road. o Based on the above findings, no further character- ization of the onsite subsurface hydrocarbon plume is necessary at this time. 9.0 FEASIBILITY STUDY Based on the findings and conclusions of the preceding investigation, it is apparent that remediation of the hydrocarbon-contaminated ground water at former Mobil Service Station 10-Np4 is necessary to comply with applicable regulations and prevent further impact to the subsurface environment. This feasibility study (FS) was performed to evaluate appropriate general response actions, available technologies, and viable ground water remediation - alternatives appropriate for the site. The objective of the feasibility study is to identify and _ evaluate viable alternative remedial technologies and cleanup measures prior to selecting the preferred alternative based on technical, economic, environmental, and legal factors. To achieve this objective, the study encompassed the following: o Review existing site conditions and findings of the previous studies performed at the site. • Establish remedial objectives. T;' o Identify potentially applicable general response actions and technologies. ® Screen each potentially applicable general response action/technology on the basis of technical effectiveness and implementability. w Conduct a cost effectiveness analysis of the most viable remedial alternatives and technologies. 9.1 Eertingnt Site conditions and the results of the site characterization study performed by Alton Geoscience, Inc. are discussed in -u detail in the preceding sections of this report. Findings from the study which are pertinent to the remediation of the site are summarized below: 18