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Mr. Robert 0. Godwin -2- 31 December 1987 <br /> source and extent of the TCE contamination must be investigated. :n addition, <br /> the Permeability of the cover at Pit 6 needs to be determined; the work plan <br /> refers to the cover as "relatively impermeable" but no documentation is pro- <br /> vided. Therefore, the work plan must be changed to include such a TCE investi- <br /> gation, the piezometer installation recommended above, and a determination of <br /> cover permeability. <br /> if you have any questions, please call me at (916) 361-50-76. <br /> �,ki&jll,l L, �LnLI <br /> WENDY L. COHEN <br /> Project Engineer <br /> WLC/mm <br /> Enclosure <br /> cc: Mr. James T. Davis, U. S. Department of Energy, Oakland <br /> Department of Health Services, Toxic Substances Control Division, Berkeley <br /> San Joaquin Local Health District, Stockton <br /> Mr. Eugene Draney, Lawrence Livermore National Laboratory, Livermore <br /> Mr. Fred Hoffman, Lawrence Livermore National Laboratory, Livermore <br />