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Mr. Dale Clemons <br /> October 27, 2000 <br /> Page 2 <br /> human health and ecological receptors, as well as groundwater. The cleanup standard <br /> for DDX in the ROD is 0.241 mg/kg. More recently, modification of the cleanup <br /> standards identified in the ROD are being sought through an Explanation of Significant <br /> Difference (ESD). <br /> DTSC concurs that additional characterization and/or remedial action at DSERTS 72 is <br /> not warranted based on the cur rant land use. However, the final document should be <br /> revised to identify DSERTS 72 as an institutional control site to ensure that the proper <br /> precautions are taken in the event that soils in the vicinity of DSERTS 72 are later <br /> disturbed and/or if a land use change should occur. Finalization of the DSERTS 72 <br /> report should coincide with finalization of the ESD. <br /> Should you have any questions, please feel free to call me at (916) 255-3713. <br /> Sincerely, <br /> Hortensia M niz, P.E. <br /> Project Manager <br /> Federal Facilities Unit <br /> cc: Mr. Michael Work <br /> U.S. Environmental Protection Agency <br /> Region IX (H-9.-1) <br /> 75 Hawthorne Street <br /> San Francisco, California 94105 <br /> Mr. Jarel Starling <br /> U.S. Army Corps of Engineers <br /> Engineering and Support Center, Huntsville <br /> Huntsville, Alabama 35816-1822 <br /> Mr. Marcus Pierce <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> HM dm <br /> HM18W.100 <br />