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3.11.1 Sampling Approaches Different sampling approaches may be utilized to demonstrate closure of HWMUs. According to OSWER Directive 9360.4-10, dated November 1991, Removal Program Representative Sampling Guidance, Volume 1: Soil, Interim Final , representative sampling approaches include: judgmental sampling, random sampling, stratified random sampling, systematic grid sampling, bias sampling, search sampling, and transect sampling. Each sampling approach has different assumptions and is appropriate for different situations depending on how much is known about possible distribution of contamination in the HWMU and in the area potentially impacted by the HWMU. It is up to the closure plan developer to establish and propose a sampling plan scheme which is the most appropriate for the regulated unit and to delineate the extent of potential contamination emanating from the unit. However, the sampling plan scheme must be sufficient in its scope, design, and detail to obtain the approval of the DEQ. Random sampling is the most common sampling approach used to demonstrate closure of HWMUs. |
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