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[ÇóÖú] Background Soil and Subsoil Samples ººÒëÓ¢

5. Background Soil and Subsoil Samples - The background soil and subsoil samples should not be from an area that has been impacted by the HWM facility operations or impacted by the HCOCs and other constituents managed in the HWMUs.
    Rationale for the site selection of the background soil sample locations needs to be provided.Background soil samples should be collected from an area where soils are of the same type and texture and where the geology is similar to that found at the locations of the HWMUs subject to closure.  Where compliance samples are taken from surface soils (0-6 in.), then it is imperative that a set of background soil samples are also taken from surface soils (0-6 in.) and the surface background soils have the same type and texture as the compliance samples.  Where background subsoil samples are needed to compare to the subsoil beneath the HWMUs, then a set of background subsoil samples should be taken at the appropriate subsoil horizons and depths that are most representative of the properties and textures of the subsoil horizons found underneath the HWMU.

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