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<br /> <br />Addendum to CDH Soil Plutonium23"'0 Surveys 1970-1991, Jonathan Love, <br />June 19'4 <br />' The USDOE is presently considering the relaxation of controls over portions or all of the buffer <br />zone. This proposed action by DOE begs the question of definitive identification of areas subject <br />to control measures and or management practices for the foreseeable future. The identification <br />of areas H~II be judged against acceptable levels of radionuclide and other contaminant <br />concentrations or loadings and future uses of the lands. The Department of Energy, The <br />Colorado Department of Health and the Environmental Protection Agency are involved in the <br />process ofassessment and discussion of appropriate plutonium soil levels or set points to trigger <br />actions(ot>jectives), the appropriate level of resolution required and the possible remedies and/or <br />management practices necessary to accomplish objectives. The explanation or model of soil <br />distribution patterns is an ongoing exercise at this time. Determination of the spatial extent of <br />contamination to establish definitive boundaries of areas needing corrective action and/or special <br />management practices are the intent of RFURI work in Operable unit 2 and 3. (Litaor 1993, <br />' USDOEa, USDOEb ) <br />The list o1'supporting data and reports is extensive. Many studies are still in progress and the <br />' questions are extensive. (Love 1993) Several researchers are continuing investigations with <br />subtle differences. Among these EG&G, CSU and CDH are sponsoring ongoing investigations. <br />(Litaor 1993, CSU, CDHb, CDHc) <br />The Colorado Department of Health Dose Reconstruction Project is investigating the doses of <br />environmental contaminants the community was exposed to over the life of Rocky Flats. This <br />includes evaluation of releases from the 903 Pad. The uncertainties associated with the data and <br />analysis are included in this work (CDHb, CDHc). Special attention is given to the 903 pad <br />' incident in Tasks 3, 4, 5 and 6 of Phase I. Task 4 of phase II is progressively expanding the <br />analysis of historical data to document correlation of media levels to routine releases and incidents <br />and comparison to other regions. Task 6 of phase I, the modeling effort, is attempting to recreate <br />' and simulate conditions at the time of the release from the 903 Pad. The approach taken uses the <br />Fugitive Lust Model to calibrate observed air monitoring results to source terms to quantify the <br />amount o1.'material released and the resulting exposure. The emphasis is on the release from the <br />903 Pad, not the resulting soil contamination. The CDH effort has noted that reconstruction of <br />specific conditions during the period of release are impossible to define precisely. (CDHc) Also, <br />past soil sampling efforts do not provide definitive geographical locations for point samples <br />(I.itaor). This impedes mapping, comparison of results and contouring accuracy. <br />The following questions were presented previously. This discussion elaborates on these issues. <br />Can CDH Soil Survey data be used to define areas of contamination? Can soil plutonium be <br />predicted by distance and direction from the plant? Is there a temporal trend in addition to the <br />spatial trend? How do CDH's soil survey data compare with other researchers? <br />1 <br />I .~ ...::...:..............:....:...........................:..........:.............................................:....:.:..........................:.....:........... <br />1 <br />