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Problem Assessment Work Plan f CSUS—Multi-Campus Regicnal Center f! January 23,2003 Page-9- I It should be noted that the proposed target clean-up levels are based on minimizing the potential for human # health risks and may not satisfy the SJCEHD and CRWQCB for site closure. If the clean-up levels as described are attained, however, Condor anticipates that the source area reduction may be enough to reduce groundwater contaminants to concentrations that additional monitoring of the site wells will indicate as not detected or very low in concentration. If this occurs, the SJCEHD and the CRWQCB may consider the site for closure (no further action) if an estimate of residual site soil and groundwater contamination are provided and the site considered very low risk to the beneficial uses of groundwater. 7.0 SUMMARY AND CONCLUSIONS The site contains significant subsurface contamination from hydrocarbon fuels that could create health a hazards from toxic vapors in nearby buildings and potential migration of contaminated groundwater off the site. The most cost effective remediation strategy involves a combination of SVE and groundwater pump and treat. The remediation time to achieve the target clean-up levels and potentially allow consideration of site closure is estimated to be 18 months to two years. 8.0 REPORTING Condor anticipates that enough data will be collected during the proposed additional groundwater investigation activities to have fully evaluated the lateral and vertical extent of site groundwater contamination. If so, a PAR will be prepared and submitted to CSUS. At a minimum the PAR will include: r (1) a discussion of the site history, (2) a description of the fieldwork conducted at the site, (3) the laboratory results, (4) a scaled site plan and cross-section indicating the estimated lateral and vertical e1 distribution of groundwater contamination, (5) drilling logs, (6) conclusions, and(7)recommendations. i i f 1 1 f } i �.4) CONDOR i