1. (a) Erosion control mix berms shall be:

   1. (1) Used only in areas where erosion will occur in the form of sheet erosion only and there is no concentration of water in a channel or other drainage way above the berm;
   2. (2) Installed following the contour of the land as closely as possible;
   3. (3) Used only if the area upslope of the berm has a slope of less than 5%; and
   4. (4) At least 12 inches high and at least 2 feet wide.

2. (b) Erosion control mix shall:

   1. (1) Have an organic portion between 25% and 65%, dry weight basis that is:

      1. a. Fibrous and elongated such as from shredded bark, stump grindings, composted bark, or equivalent manufactured products; and
      2. b. Not comprised of wood chips, bark chips, ground construction debris, or reprocessed wood products;
   2. (2) Not contain silts, clays, or fine sands;
   3. (3) Have a particle size by weight of 100% passing a 3-inch screen, 90% to 100% passing a 1-inch screen, 70% to 100% passing a 0.75-inch screen, and 30% to 75% passing a 0.25-inch screen; and
   4. (4) Have a pH between 5.0 and 8.0.

Source. #9343, eff 1-1-09; ss by #12342, eff 8-15-17; ss by #14472, eff 1-19-26, EXPIRES: 1-19-36