N.H. Admin. Code § Env-Wt 903.04

Current through Register No. 50, December 12, 2024

Section Env-Wt 903.04 - Information Required for All Stream Crossing Standard Permit Applications

In addition to the information required by Env-Wt 311, the applicant shall submit the following for all stream crossing projects that require a standard permit:

(a) On the USGS map or updated data based on LiDAR required by Env-Wt 311.06, the following:

(1) The approximate boundaries of the contributing watershed;

(2) The size of the contributing watershed; and

(3) Identification of the stream tier based on watershed size;

(b) Plans showing the following:

(1) The scale, a north arrow, and at least 3 cross-sections outside of the construction disturbance area that are representative of the stream system away from the area of direct influence by the crossing;

(2) Clearing limits showing all proposed work areas;

(3) For both the existing structure, if any, and the proposed structure, the following:

a. Location;

b. Type;

c. Dimensions; and

d. Inlet and outlet invert elevations;

(4) The extent of channel excavation and filling;

(5) Road locations, including road edges, centerline, and boundaries of the right-of-way;

(6) Proposed channel work including bank erosion control features, grade control, and channel linings; and

(7) For the proposed structure, cross-sections showing the water surface elevation resulting from the applicable design storm, with bed material and backfill zones;

(c) Existing crossing metrics, including:

(1) Existing riparian zone, including the extent and type of existing vegetation surrounding or in the stream bank; and

(2) Existing tailwater control, including its location and materials, and pool configuration;

(d) The dewatering system, as follows:

(1) Estimates of the maximum flow anticipated during construction, including any summer storm estimates;

(2) The hydraulic calculation for the bypass pipe or channel size, length, and gradient;

(3) Location, height, and width of the diversion dam;

(4) Sump locations, including estimate of necessary flow and sump capacity;

(5) Backwater prevention method; and

(6) Sediment treatment plan with methods, release point, and extent;

(e) Erosion and pollution controls, as follows:

(1) Any additional methods of controlling erosion;

(2) A soil stabilization plan, including but not limited to where to cover stockpiles and place straw bales; and

(3) Pollution control methods for pumps, fuel stations, and equipment storage;

(f) The number and location of footings, if any, and the following for each:

(1) Estimate of bearing capacity;

(2) Dimensions of each footing; and

(3) Footing depth;

(g) A narrative explaining why the cross-sections identified pursuant to (b)(7), above, are representative;

(h) The design features used to improve aquatic organism passage and the expected distance, in linear feet, of downstream and upstream improvement for aquatic organism passage or fish passage;

(i) The hydraulic capacity of the proposed crossing, in terms of flood frequency event, and of the existing crossing, if any; and

(j) The following channel information at the crossing and for the reference reach:

(1) The classification of the stream using the Rosgen classification system as described in Applied River Morphology by Dave Rosgen, 1996, available as noted in Appendix B, at the crossing and upstream and downstream of the crossing;

(2) Bankfull width;

(3) Bankfull depth;

(4) Entrenchment ratio;

(5) Sinuosity; and

(6) Flood-prone width.

N.H. Admin. Code § Env-Wt 903.04

Derived from Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12809, Effective 12/15/2019, Expires 12/15/2029.