F22. Very Shallow Dark Surface

For use in MLRA 138 and West Florida portion of 152A of LRR T and MLRA 154 of LRR U; for testing in all other MLRAs and LRRs.

In depressions and flood plains subject to frequent ponding and/or flooding, one of the following must be observed:

a. If bedrock occurs between 15 cm (6 inches) and 25 cm (10 inches) of the soil surface, a layer at least 15 cm (6 inches) thick starting at a depth ≤10 cm (4 inches) from the soil surface with value 2.5 or less and chroma 1 or less, and the remaining soil to bedrock must have the same colors as above or any other color that has chroma 2 or less. Or,

b. If bedrock occurs at a depth ≤15 cm (6 inches) from the soil surface, more than half of the soil thickness must have value 2.5 or less and chroma 1 or less, and the remaining soil to bedrock must have the same colors as above or any other color that has a chroma 2 or less.