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CASE CLOSURE SUMMARY October 8, 1999 <br />Former Santa Ana City Yard, Santa Ana Page 5 <br />UST No. 083000117 <br />ULUJUKL <br />Does completed corrective action protect beneficial uses per the regional board basin plan? YES [x ] NO[ ] <br />Does the corrective action protect public health for current land use? YES[ X ] NO[ ] <br />A change in land use is proposed for the site. In the near future, the site will be redeveloped as a baseball field. <br />A Human Health Risk Assessment, dated September 8, 1999, was prepared for this site. The excess cancer risk posed by <br />residual benzene vapors beneath the site was estimated to be one in 93 million. This was below the de minimis levels of <br />one in one million. As a result, the report concluded that no significant excess cancer risk was expected from benzene - <br />impacted soil vapors. Since the site was located in Santa Ana it was not under the jurisdiction of the Orange County <br />Health Care Agency ( OCHCA), the agency that normally reviews and approves human risk assessments. As a result, <br />Board staff required that the report be independently reviewed by a health care expert for concurrence with the report's <br />conclusions. An independent consultant, and former OCHCA employee, reviewed the report. Based on the independent <br />review, it was concluded that the risk assessment was correctly modeled and that the conclusions were valid (a copy of the <br />letter regarding this review is attached). <br />SITE MANAGEMENT REQUIREMENTS <br />Should corrective action be reviewed if land use changes? <br />YES [ ] NO [X ] See the above comment regarding the human risk assessment conducted for the site. <br />Monitoring or vapor wells decommissioned: YES [ ] NO[ ] NIA [x ] <br />Note: Remaining wells to be properly abandoned in the near future. Documentation of these activities must be submitted <br />to this office (i.e., copies of well abandonment permit, etc.). <br />Enforcement Actions Taken: N/A <br />