SITE INFORMATION AND CORRESPONDENCE_FILE 1

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• Now, Thomas Berg AMMoNdMiIIHRAwrkPln June 16.2005 Page#3 show evidence of the presence of VOCs in soil and soil gas, and groundwater matrices, should be evaluated for risk associated with indoor air intrusion, including showering. HERD proposes that prior to conducting a quantitative comprehensive risk assessment, previous and supplemental investigation data should be submitted for evaluation of their adequacy in lateral and vertical extent of characterization of suspected contaminants in soil, soil gas and groundwater. This procedure is likely to expedite the characterization of risk. In view of the location of the site, ecological risk should be addressed in a qualitative manner only. Under Section 5.4.1.4, Identification of Chemicals of Potential Concern, HERD recommends that the project geologist (DTSC) should be consulted for identifying locations and samples per location on metal background data. Appendices Appendix A: No major flaws were evident in this Appendix. HERD, however, would like to recommend that in case of any clarification or questions concerning the use of an appropriate method for a profile of a class of analytes, contact the Hazardous Materials Laboratory, 2151 Berkeley Way, Berkeley, California 94704; Telephone # (510) 540-2305, for additional information and directions. Appendix B: Health and safety plan should be reviewed by the Department's Industrial Hygiene professional. Appendix C: Risk/Hazard Calculation Spread Sheets. HERD recommends that, to the extent possible, site specific parameters should be used, where applicable. For toxicity values, the most recent version of the source should be employed. The spreadsheet calculations will be checked by HERD, when presented in the risk assessment document. Appendices D and E: Lead Spread Model and Johnson and Ettinger Model, as presented, do not have any serious defects. HERD will evaluate the application of these models when presented in the risk assessment report. Conclusion and Recommendations In general, the work plan has been fairly well presented for conducting risk assessment at the site. In order to assist in the development of a comprehensive risk assessment document, HERD has provided specific comments on, but not limited to, the analytical approach, areas proposed for "No Further Action", and Appendices. If the facility consultants should desire to obtain any clarification or have any questions, they are encouraged to contact the HERD toxicologist for discussion.