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Mr. Jim Levy June 14, 2006 Page 3 affected by the high bias. It is unwise to dismiss this high bias as not significant without sufficient documentation and/or study to support these claims. 8. Page 22, Section 5.2 Analytical Results. Reference is made to Preliminary Remediation Goal (PRGs) and California Human Health Screening Level (CHHSLs) that are health-risk based concentrations. As stated in the Disclaimer of the Use of California Human Health, Screening Levels in Evaluation of Contaminated Properties the document and the Human Health Screening Levels presented are not to serve as 1) a stand alone decision making tool; 2) a substitute for guidance for the preparation of a baseline human health risk assessment; 3) to be used to determine if a waste is hazardous; 4) a rule for determining if a release must be reported; 5) to set final cleanup or action levels to be applied at contaminated sites; or 6) to guarantee that oversight will determine that project is adequately studied or agree with conclusions of the site investigation and risk assessment report. Additionally, the results should also be compared to site-specific background concentration for each contaminant. Although the individual constituents found at the site indicate lower risk level, a baseline Human Health Risk Assessment which takes into account all contaminants would still be required as part of the investigation. 9. Page 22, Section 5.3 OU 1, and Figure 5. Please clarify the location for the following borings: OU1 AOI 3-S1, OW A013-S3, OW AOI-S5, and OW A013- S10. The text is inconsistent with the locations shown on figures 3 through 5. 10.Figures. Figures 2 through 9 outline the parking lot in the commercial area as part of OU4. This area has not been identified in previous documents; therefore, no historical data has been presented. If this area is part of OU 4, additional site characterization will need to be conducted to evaluate if this area has been impacted by past activities. 11 .Appendix A. The boring logs are not clear with regard to the column identified as "Type & No". Please clarify what these mean. In addition, the logs should show the depth where samples were collected and where ground water was encountered. 12.Appendix A. There are some discrepancies (i.e., see Boring OU1-AO12-S3, neat cement to 12 feet and total depth of boring only 4 ft. bgs) in some of the boring logs that need to be addressed.