N.H. Admin. Code § Env-Wt 611.04

Current through Register No. 50, December 12, 2024

Section Env-Wt 611.04 - Design and Plan Requirements

(a) No structures shall be proposed in sand dunes except for structures on in-fill lots that will be located on the landward side of the fore dune.

(b) Designs for projects in sand dunes shall:

(1) Incorporate mechanisms to limit impacts to existing intact sand dunes;

(2) Use sand fences to capture sand for major projects;

(3) Identify construction practices needed to protect sensitive plant and animal species and water quality; and

(4) Identify construction techniques and designs used to address any vulnerability assessment.

(c) The applicant for a permit for a construction project in sand dunes shall provide the following information on the plans submitted pursuant to Env-Wt 311.06:

(1) If any portion of the property is located in the 100-year floodplain, the location of the 100-year floodplain boundary and water elevation as shown on the effective FEMA Flood Insurance Rate Map;

(2) The location of the 2.0-foot elevation contour as measured above the HOTL; and

(3) The location, with dimensions, of:

a. All impervious areas;

b. Areas of existing vegetation, with the vegetation identified on the plan;

c. Each rare, threatened, or endangered plant species as reported by NHB;

d. All disturbed areas, including existing lawn, gardens, and paths;

e. All areas to remain in an unaltered state;

f. All proposed temporary impacts associated with completion of the project, with a description of each temporary impact;

g. Proposed methods of erosion and siltation controls indicated graphically and labeled or otherwise annotated as needed for clarity;

h. A planting plan to include the Latin names and common names of plant species, plant spacing location and depth of each planting, time of planned planting, watering, irrigation to monitor and ensure success, any soil requirements or exposure requirements of plantings; and

i. All other relevant features necessary to clearly define both existing conditions and the proposed project.

(d) The applicant for a permit for a construction project in sand dunes shall submit with the application a completed impervious coverage worksheet that includes:

(1) The name of the person who completed the worksheet;

(2) The date of the plan on which the worksheet is based;

(3) Square feet of the lot within the sand dune;

(4) Square feet and percentage of the lot area constituting existing impervious surface(s) within the sand dune; and

(5) Total percentage of sand dune area within the lot that will be impervious upon completion of the project.

(e) For any project proposing an impervious area on an in-fill lot of at least 15% but not more than 20%, the applicant shall certify in writing that the impervious area is not more than 20%.

(f) For any project proposing an impervious area on an in-fill lot of greater than 20%, the applicant shall submit plans, prepared by a professional engineer, for a stormwater management system that will infiltrate the increased stormwater.

(g) For any project proposing pervious surfaces, the applicant shall submit a plan and specifications for long-term maintenance of the pervious surfaces.

N.H. Admin. Code § Env-Wt 611.04

Derived from Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12806, Effective 12/15/2019, Expires 12/15/2029.