Section Env-Wt 904.06 - Tier 4 Stream Crossings(a) A tier 4 stream crossing shall be a crossing located on a tidal watercourse.(b) A tier 4 stream crossing shall be a span structure or a culvert specifically designed for the geomorphic and habitat conditions of the tidal environment.(c) The applicant may propose an alternative design by submitting a request as specified in Env-Wt 904.10.(d) Compensatory mitigation shall be required for any new tier 4 stream crossing unless the crossing: (1) Meets the general design criteria in Env-Wt 904.01 and the tier-specific criteria in Env-Wt 904.07;(3) Improves aquatic organism passage, connectivity, and hydraulics; and(4) Is not an alternative design or any design for which a waiver is needed.(e) In addition to meeting Env-Wt 903.07(c) and (d), plans for a tier 4 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.N.H. Admin. Code § Env-Wt 904.06
Amended by Volume XXXVIII Number 32, Filed August 9, 2018, Proposed by #12578, Effective 7/21/2018, Expires 7/21/2028.Amended by Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12809, Effective 12/15/2019, Expires 12/15/2029.