- (a) A tier 2 stream crossing shall be a crossing located on a watercourse where the contributing watershed is greater than 200 acres and less than 640 acres.
- (b) Subject to (c), below, any new tier 2 stream crossing and any replacement tier 2 stream crossing that does not meet the criteria specified for replacement in Env-Wt 904.08 shall be a span structure, pipe arch embedded with stream simulation, open-bottom culvert with stream simulation, or closed-bottom culvert embedded with stream simulation.
- (c) The applicant may propose an alternative design for a new tier 2 stream crossing by submitting a request as specified in Env-Wt 904.10.
(d) Compensatory mitigation shall not be required for:
- (1) Any new tier 2 stream crossing that meets the requirements of this section and Env-Wt 904.07;
- (2) Any tier 2 stream crossing that is self-mitigating; or
- (3) Any tier 2 stream crossing that is repaired, rehabilitated, or replaced pursuant to Env-Wt 904.08.
- (e) Plans for a tier 2 stream crossing shall be dated and bear the signature and seal of the professional engineer who prepared or had responsibility for and approved them, as required by RSA 310-A:18.
Source. #12809, eff 12-15-19; amd by #13124, eff 10-23-20