11 Miss. Code. R. § 5-2-280.4-4.2.1 - Removal of a Single Tank - No Sidewall Contamination Apparent
If no contamination is apparent in the sidewalls, only floor sampling is required. Two samples must be collected from the floor of the excavation at a depth of one foot into the native soil. The samples must be collected from the areas of the floor that appear to be the most contaminated. However, you should also take into consideration the entire area of the excavation so that both of the floor samples are not collected from the same general area. If no area of the floor appears to be obviously contaminated, or the floor appears to be uniformly contaminated, the samples must be collected from each end of the excavation as shown in Figure 1.
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