For use in all LRRs, except for T, U, W, X, Y, and Z and portions of LRR P outside of MLRA 136t.

A layer of mucky modified sandy soil material 5 cm (2 inches) or more thick starting at a depth ≤15 cm (6 inches) from the soil surface.

User Notes: “Mucky” is a USDA texture modifier for mineral soils. The content of organic carbon is at least 5 percent and ranges to as high as 14 percent for sandy soils. The percent required depends on the clay content of the soil; the higher the clay content, the higher the content of organic carbon required. For example, a mucky fine sandy soil contains between 5 and 12 percent organic carbon.