Sediment forebays shall comply with the following:
- (a) Sediment forebays shall not be located in any of the areas identified in Env-Wq 1507.02(c) unless the practice has an impermeable liner;
- (b) If the sediment forebay is located in soils classified as Abenaki, Adams, Agawam, Boscawen, Caesar, Champlain, Colton, Croghan, Deerfield, Haven, Hinckley, Hoosic, Metallak, Quonset, or Warwick or any combination thereof, the sediment forebay shall have an impermeable liner or meet the infiltration criteria specified in Env-Wq 1508.07 or Env-Wq 1508.08;
- (c) Unless otherwise specified, a sediment forebay shall be designed to contain 10% of the WQV;
- (d) Sediment forebays for gravel wetland and bioretention with internal storage reservoir systems shall be designed to drain within 72 hours of storm events;
- (e) Forebays shall be no less than 2 feet and no more than 6 feet in depth;
- (f) Forebay side slopes shall be no steeper than 3:1;
- (g) A fixed vertical sediment marker shall be installed to measure sediment depth; and
- (h) Upon completion of maintenance, all disturbed areas shall be re-stabilized in accordance with the approved plans.
Source. #9343, eff 1-1-09; ss by #12342 (formerly Env-Wq 1508.10); ss by #13758, eff 9-28-23 (formerly Env-Wq 1508.11); ss by #14472, eff 1-19-26, EXPIRES: 1-19-36