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n <br />Addendum to CDH Soii Plutonium"~'Z'0 Surveys 1970-1991, Love, June, 1994 <br />Therefore, the plutonium contaminated soils in the area are not a source of further contamination <br />The remaiivng issue is the segregation of areas by soil plutonium79200 contours. A basis for using <br />CDH data has been rovided in the main re ort. Revisions of this a roach ma be feasible and <br />due to these pathways, resuspension or infiltration under present normal activities. The presence <br />of the earthworms and the Baseline Biological Characterization of the Terrestrial and Aquatic <br />Habitats crt The Rocky Flats Plant implies neither toxic conditions nor a threat to the terrestrial <br />populations and communities exists, respectively (USDOEb, USDOEd). Final confirmation and <br />or determnnation of pathways that may be a concern will be determined with the OU 2, OU3, <br />OUS (Woman Creek) and OU6 (Walnut Creek) Environmental Evaluations. The lack of <br />significant mechanisms for transport, no new primary or existing secondary sources and good <br />ecological conditions highlights human health risk and the state standard as controlling provisions. <br />Needed actions to address the surface soil plutonium contamination in the Zone 1 area of the <br />CDH surveys, outside the original Rocky Flats boundary, await the final reports for these areas <br />and options for possible changes in land use. Zone 2 areas may not require any consideration <br />once properly characterized under the RFI/RI process. <br />Definition of Discrete Areas of Concern, Isopleths of Plutonium "'~='0 <br />P P PP Y <br />warranted. The more appropriate use of CDH data would be to designate areas for oversight <br />until more definitive work provides the classification system, set points and boundaries with the <br />appropriate degree of precision. Sampling of areas north of the 903 Pad and the Buffer Zone, <br />west and north of the Industrial area, have not been reported (Lataor 1993} . We are unable to <br />determine that a higher level of precision and contouring is required for these areas. <br />Linear regression was attempted to model CDH Sector results to predict future values over time <br />(Tent', 19739). Data was aggregated over the total record and into pre-1975 and post 1975 <br />results. In the future the CDH Radiation Control division will explore other statistical means to <br />correlate observations to distance and direction from the plant and possibly changes over time. A <br />discussion of statistical assumptions and their validation should precede any statistical approach <br />taken. <br /> <br /> <br />6 <br /> <br /> <br />