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Mr. Charles White <br /> September 6, 1988 <br /> Page 2 <br /> - An expanded description of the flushing system to be <br /> implemented. <br /> - A description of the operation plan for the groundwater <br /> extraction system and subsequent treatment. <br /> - Alternatives for managing the materials in the North <br /> Area separately or in conjunction with overall pond <br /> waste management. <br /> - Monitoring programs required to assess effectiveness of <br /> each evaluated alternative. <br /> - Technical evaluation of lateral migration barrier for <br /> the site conditions. <br /> The report submittal date is contingent upon completion of <br /> outstanding data collections activities. However, it is <br /> anticipated that the report will be submitted by October 17, <br /> 1988. <br /> 2. Group 1 Arsenic Reanalyses. Upon confirmation of the <br /> apparent mistake in arsenic analytical procedures, an <br /> initial group of approximately 162 samples were released for <br /> reanalysis. The initial samples selected were those samples <br /> that were at or near the background plateau concentration, <br /> as discussed in August 2, 1988 correspondence from T.A. <br /> Hickey to Jim Austreng. The results of reanalysis of Group <br /> 1 arsenic samples will be included in the Final Engineering <br /> and Environmental Analysis Report, but an advance copy will <br /> be sent when received. <br /> 3. Group 2 Arsenic Reanalyses. The soil samples from the <br /> interior surfaces of the surface impoundment and certain <br /> areas of the North Area were not included in the Group 1 <br /> since the initial results of the samples indicated conclu- <br /> sively that these solids contained arsenic. Reanalyzing to <br /> account for aluminum interference will not appreciably alter <br /> the current characterization of the extent of arsenic <br /> contamination in the soils. It is acknowledged, however, <br /> that reanalyzing these samples will result in datasets which <br /> are directly comparable. Group 2 arsenic samples, there- <br /> fore, have been released for reanalysis. The results of <br /> Group 2 sample reanalysis will be included in the Final <br /> Engineering Environmental Analysis Report, but an advance <br /> copy will be sent when received. <br />