SITE INFORMATION AND CORRESPONDENCE_2005-2014

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Mr. Maurice Benson February 5, 2009 Page 2 responsible for the proposed remedial action. The Proposed Plan should be amended to identify the regulatory support agencies for the Preferred Alternative. 2. Page 1, Introduction to the Proposed Plan; DTSC recommends that the introduction section describe the other remedial options considered. Presently, the Proposed Plan does not identify the alternative remedial options and should be amended to include the other potential remedies. 3. Page 1, Public Comment Period and Public Meeting; Once regulatory comments are received, this section should specify the public meeting date, anticipating the required time to adequately address comments and incorporate changes into the Plan prior to final publication. 4. Page 2, Overview of the Proposed Plan; USEPA guidance recommends that the relationship of the Remedial Investigation and Feasibility Study (RI/FS) to the Proposed Plan be discussed in the document. Specifically, the Proposed Plan's contents should highlight the historical contaminant releases, sources, remedial alternatives presented in FS, and refer the reader to the RI/FS for more information regarding the proposed remedial action(s). DTSC recommends that this section of the Proposed Plan be amended to discuss the above-mentioned information from the RI/FS and refer the reader to these documents for additional background information on the remedial action(s). 5. Page 3, Background and Site Characteristics; DTSC recommends that the Proposed Plan describe the previous major public participation activities prior to the issuance of the Plan, including public notices, fact sheets, public meetings, and restoration advisory board meetings. 6. Page 3, Background and Site Characteristics; The Proposed Plan discusses soil contamination related to both metals and Trichloroethylene (TCE), mentioning TCE groundwater contamination in the Overview, Site Characteristics, and Site Risk sections. Additionally, the figure on page two presents the "...DDJC-Sharpe Soil Sites," identifying TCE in the legend, and depicting the former TCE soil sites, including Site P-5A, the source of the offsite Central Area plume, but fails to provide a figure presenting the TCE groundwater contamination. Considering the TCE soil contamination ultimately caused the groundwater contamination, the most expensive operable unit to remediate, a figure depicting existing groundwater conditions both onsite and offsite, including Site P-5A is recommended for the Proposed Plan.