Flow through devices such as hydrodynamic separators, water quality inlets, and oil or particle separators shall comply with the following:
- (a) The devices shall be designed according to the manufacturer’s recommendations based on the WQF to remove a minimum of 80% of U.S. Silica grade OK-110 sand at the WQF;
- (b) Water quality inlets and oil or particle separators shall have a 4 foot minimum sump;
- (c) Water quality inlets shall be a 3-chamber design, with the first and second chambers having a minimum of 400 cubic feet of storage per acre of contributing impervious area;
- (d) Each water quality inlet and oil or particle separator chamber shall be accessible by means of a separate manhole;
- (e) The contributing area to the oil or particle separator shall not exceed 1.0 acre of impervious area;
- (f) Oil or particle separators shall only be used in an off-line configuration to treat the WQF; and
- (g) Oil or particle separators shall have a minimum of 400 cubic feet of permanent pool storage per acre of contributing impervious area.
Source. #9343, eff 1-1-09; ss by #12342 (formerly Env-Wq 1508.13); ss by #13758, eff 9-28-23 (formerly Env-Wq 1508.14); ss by #14472, eff 1-19-26, EXPIRES: 1-19-36