Poorly drained soils shall be identified as hydric soils that have aquic conditions in the upper part and one or more of the following for any soil texture:

1. (a) Within 10 inches of the top of the mineral soil material and directly under an A or Ap horizon, a horizon with a depleted or gleyed matrix;
2. (b) Within 20 inches of the top of the mineral soil material and directly underlying a thick or very thick dark A or Ap horizon, a horizon with a depleted or gleyed matrix which is 4 inches or more in thickness;

3. (c) A matrix chroma of 2 or less that extends to a depth of 20 inches below the top of the mineral soil material, with a dark A or Ap horizon that is directly underlain by a horizon with a matrix value of less than 4, and, within 12 inches of the top of the mineral soil material or directly underlying the A or Ap horizon, whichever is shallower, 2% or more redoximorphic features that extend to the shallower of:

   1. (1) A depth of 20 inches below the top of the mineral soil material; or
   2. (2) A depleted or gleyed matrix;

4. (d) A spodic horizon and, within 6 inches of the top of the mineral soil material, an E horizon with 2% or more redoximorphic features or a stripped matrix that is directly underlain by a spodic horizon with either of the following:

   1. (1) A Bh or Bhs horizon, or Bs horizon with 2% or more redoximorphic features in the upper part; or
   2. (2) A Bh or Bhs horizon, that is directly underlain by a horizon with 2% or more redoximorphic features;

5. (e) A spodic horizon and a Bh or Bhs horizon greater than 2 inches thick which is:

   1. (1) Within 10 inches of the top of the mineral soil material;
   2. (2) Directly underlying a dark A or Ap horizon or shallow E horizon; and
   3. (3) Directly underlain by a horizon with 2% or more redoximorphic features that is within 20 inches of the top of the mineral soil material;

6. (f) A spodic horizon and, within 10 inches of the top of the mineral soil material and directly underlying a dark A or Ap horizon, one of the following:

   1. (1) An E horizon with 2% or more redoximorphic features or a stripped matrix directly underlain by a Bh or Bhs horizon, or Bs horizon with 2% or more redoximorphic features;
   2. (2) A Bh or Bhs horizon directly underlain, but within 20 inches of the top of the mineral soil material, by 2% or more redoximorphic features; or
   3. (3) A Bs horizon with 2% or more redoximorphic features;

7. (g) If sandy and no spodic horizon, either of the following:

   1. (1) Within 10 inches of the top of the mineral soil material and directly underlying a dark A or Ap horizon, a horizon with matrix color chroma 3 or less, value 4 or more with 2% or more redoximorphic features; or
   2. (2) Within 15 inches of the top of the mineral soil material and directly underlying a greater than 10 inches, less than 15 inches, very dark A or Ap horizon, a horizon with matrix color chroma 3 or less, value 4 or more with 2% redoximorphic features;
8. (h) No spodic horizon, and within 10 inches of the top of the mineral soil material and directly underlying a dark A or Ap horizon, a horizon with 5% or more redox depletions and within 20 inches of the top of the mineral soil material a horizon with a depleted or gleyed matrix;
9. (i) No spodic horizon, and within 15 inches of the mineral soil material and directly underlying a greater than 10 inch, less than 15 inch, very dark Ap horizon, a horizon with 5% or more redox depletions and within 20 inches of the top of the mineral soil material a horizon with a depleted or gleyed matrix; or

10. (j) A very dark A or Ap horizon less than 10 inches thick and directly underlain by a horizon with matrix color due to wetness of chroma 3 or less with 10% or more redoximorphic features, and:

    1. (1) Within 6 inches of the top of the mineral soil surface, 2% or more redoximorphic features; and
    2. (2) Within 18 inches of the top of the mineral soil material, 2% or more redoximorphic depletions.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36