New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1500 - ALTERATION OF TERRAIN
Part Env-Wq 1506 - METHODS FOR EROSION AND SEDIMENT CONTROL DURING TERRAIN ALTERATION ACTIVITIES
Section Env-Wq 1506.05 - Sediment Control Methods: Erosion Control Mix (ECM); ECM Berms
Universal Citation: NH Admin Rules Env-Wq 1506.05
Current through Register No. 13, March 27, 2025
(a) Erosion control mix berms shall be:
(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) Installed following the contour of the
land as closely as possible;
(3)
Used only if the area upslope of the berm has a slope of less than 5%;
and
(4) At least 12 inches high and
at least 2 feet wide.
(b) Erosion control mix shall:
(1) Have an
organic portion between 25% and 65%, dry weight basis that is:
a. Fibrous and elongated such as from
shredded bark, stump grindings, composted bark, or equivalent manufactured
products; and
b. Not comprised of
wood chips, bark chips, ground construction debris, or reprocessed wood
products;
(2) Not contain
silts, clays, or fine sands;
(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)
Have a pH between 5.0 and 8.0.
(See Revision Note #1 at chapter heading for Env-Wq 1500) #9343, eff 1-1-09
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