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LLNL proposes to obtain soil samples from the following areas: (1) Four areas downwind of the Explosives Waste Treatment Facility (EWTF) Burn Units (i.e., Thermal Treatment Unit and Burn Pan); (2) One area upwind of the Burn Units and Detonation Pad; (3) Two areas downwind of the EWTF Detonation Pad; and (4) Three areas unaffected (representing ambient conditions) by EWTF operations approximately 7000-8000 feet upwind of the facility. The purpose of the sampling in areas 1, 2, and 3 is to detect if operations cause increases in concentrations of materials downwind of the Burn Units or downwind of the Detonation Pad. The purpose of the sampling in area 4 is to determine if previously developed background screening levels can be applied to EWTF operations. A 20 foot diameter circle will define each sample area. Soil samples will be obtained from four random locations inside each 20 foot circle. The samples will be obtained immediately below the surface, free of any organic matter (e.g., roots) and other surface and subsurface material (e.g., rocks) that is not conducive to analysis. The random identification of four discrete sample locations in each circle will allow the variability between sample locations and areas, if present, to be evaluated statistically. At a minimum, data will be evaluated by the Wilcoxon Rank Sum test. All future sampling will occur in the same 20 foot diameter circle; however, only one randomly located sample (instead of four) will be obtained. Future samples will be analyzed for the same chemicals of potential ecological concern (CPECs) as the initial sample. Sample areas and locations will be recorded by Global Positioning System coordinates

osti oai (u.s. department of energy office of scientific and technical information)

Soil Sampling Plan in Support of the Human Health and Ecological Risk Assessment for the Operation of the Explosives Waste Treatment Facilitiy at Site 300 of the Lawrence Livermore National Laboratory