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Mr. Maurice Benson <br /> February 5, 2009 <br /> Page 3 <br /> 7. Page 4, Summary of Site Risks, third paragraph; The statement that cleanup <br /> activities that have "...prevented further movement of contaminants from soil into <br /> groundwater." is not an accurate statement because the persistent TCE Source . <br /> Areas at Sites P-5A, South Balloon, and North Balloon have continued to <br /> contaminate groundwater and only more recently in mid-2008 were remedial <br /> actions taken to reduce and possibly eliminate the source areas for the <br /> groundwater plumes at DDJC-Sharpe. DTSC recommends that the sentence is <br /> either removed for accuracy or restated to "...prevented further movement of <br /> contaminants from soil into groundwater in most cases." <br /> 8. Page 4, Summary of Site Risks; Section 3.3.5 of the USEPA guidance states the <br /> Proposed Plan should include separate subsections for both the discussion of <br /> human and ecological risks in the Proposed Plan. Key risk information that is <br /> recommended but not currently provided includes: groundwater use assumptions <br /> (current and future); potentially exposed populations in current the future risk <br /> scenarios; exposure pathways affecting each population group; and, a more <br /> detailed human health risk using carcinogenic and non-carcinogen exposures. <br /> 9. Page 8, Community Participation, Contacts; USEPA Project Manager <br /> Mr. Phillip Ramsey should replace Mr. Michael Work as the contact. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> me at (916) 255-3713, or e-mail me at pmacnich(cDdtsc.ca.00v <br /> Sincerely, <br /> Peter MacNicholl, P.E. <br /> Hazardous Substances Engineer <br /> Sacramento Office <br /> Brownfields and Environmental Restoration Program <br /> cc: Mr. Mike Thomas <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, California 95833 <br />