Soil permeability of the most restrictive soil layer (cm/hr)
>2.4 1 Depth to seasonal groundwater (m)
a See Chapter 9 for a description of the processes. b NS, not suitable.
c Soil depth to bedrock or impermeable barrier.
Source: Adapted from USEPA, Process Design Manual: Land Application of Sewage Sludge and Domestic Septage, EPA 625/R-95/001, CERI, Cincinnati, OH, 1995.
The transport distance is a critical factor and must be included in the final ranking. The rating values for distance given in Table 2.7 can also be used for agricultural biosolids operations. In general, it is economical to transport liquid biosolids (<7% solids) about 16 km (10 mi) from the source; for greater haul distances, it is usually more cost effective to dewater and haul the dewatered biosolids.
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