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a'r Y <br /> • <br /> Mr. Marshall Cloud <br /> September 13, 2004 <br /> Page 2 <br /> comparison, the United States Environmental Protection Agency's Region 9 Preliminary <br /> Remediation Goals for residential soil use for DDT and dieldrin are 1700 Ng/kg and 30 <br /> pg/kg, respectively. Two new long-term monitoring wells, LM178AU and LM097AUA <br /> were installed downgradient and within the excavation area on February 23, 2003, to <br /> monitor ground water. <br /> In conclusion, DTSC concurs that the residual contaminant levels present at SWMU 8 <br /> satisfy the revised cleanup standard set in the 2004 ESD and are protective of human <br /> health and the environment for unrestricted land use. No Institutional Controls are <br /> necessary for SWMU 8. <br /> If you have any questions or comments regarding this letter, please contact the Project <br /> Manager, Mr. Peter MacNicholl at (916) 255-3713 or e-mail at pmacnicho_dtsc.ca.gov. <br /> Sincerely, <br /> d4�T9_ � ' <br /> Anthony J. Landis, P.E. <br /> Chief <br /> Northern California Operations <br /> Office of Military Facilities <br /> cc: See next page. <br />