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Mr. Maurice Benson <br /> March 12, 2009 <br /> Page 6 <br /> Moreover, DTSC cannot support the preliminary remedial action level of 0.9 pg/L <br /> proposed by DESJC for dieldrin in both onsite and offsite groundwater. <br /> Specifically, the 0.9 pg/L concentration proposed is outside of the risk <br /> management range of 10E-4 to 10E-6 cancer risk. DTSC's Human and <br /> Ecological Risk Division had already identified in a letter to DDJC-Tracy that a <br /> dieldrin concentration of 0.19 pg/L in groundwater corresponded to a human <br /> health risk of 2E-4 cancer risk, which is outside the risk management range. <br /> DTSC cannot support a remedial action level for dieldrin over four times the <br /> concentration previously identified as an unacceptable threat to human health. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> me at (916) 255-3713, or email me at pmacnichCcDdtsc.ca.gov <br /> Sincerely, <br /> Peter MacNicholl, P.E. <br /> Remedial Project Manager <br /> Sacramento Office <br /> Brownfields and Environmental Restoration Program <br /> Attachments: <br /> cc: Mr. Mike Thomas <br /> URS Corporation <br /> Crown Corporate Center <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, California 95833 <br /> Mr. Rich Howard <br /> TechLaw, Incorporated <br /> 921 11th Street, Suite 502 <br /> Sacramento, California 95814 <br /> Mr. Michael Work (SFD-8) <br /> U.S. Environmental Protection Agency <br /> Region IX <br /> 75 Hawthorne Street <br /> San Francisco, California 94195 <br />