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If a random sampling scheme is selected, the closure plan should provide the following:
    1. The method used for generating the random numbers.
    2. The random numbers generated.
    3. The random number grids developed for each HMWU.  Also show the random grid locations relative to the dimensions of each HWMU.
    Often a combination of bias sampling and random sampling is used in developing a sampling plan for closure of a HWMU.
    Bias sampling is often used to evaluate soils, subsoils, groundwater, wetlands,
sedimentation basins, surface waters, or other mediums that may have been impacted by the release of hazardous waste or hazardous waste constituents.   Bias sampling is used to evaluate the presence of HCOCs beneath migration pathways (cracks, seams, etc.) found in the structure or in the secondary containment of the HWMU.  Bias sampling may be used to evaluate suspected hot spots in target areas near the HWMU, potential migration of HCOCs based upon the knowledge of historical waste management activities, the conditions of the HWMUs, and location of
the HWMUs.  Bias sampling is also used for selecting the background samples.

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