N.H. Admin. Code § Env-Dw 305.25

Current through Register No. 50, December 12, 2024

Section Env-Dw 305.25 - Well Construction

(a) The applicant shall engage a New Hampshire-licensed water well contractor to install the well in compliance with the rules adopted by the New Hampshire water well board pursuant to RSA 482-B, We 100 et seq.

(b) In addition to any construction standards included in (a), above, the following shall apply:

(1) To prevent surface water from channeling along the well casing, the void area outside the casing shall be filled with cement grout, bentonite grout, or a cement-bentonite grout mixture to within at least 6 feet of the ground surface from:

a. For a bedrock production well, the bottom of the pilot hole; and

b. For an overburden production well, an appropriate depth determined by the NH-licensed water well contractor based on well design and the type of unconsolidated material encountered when installing the well;

(2) The well casing shall:

a. Extend at least 18 inches above the ground surface for production wells that are not installed within the 100-year flood zone; and

b. Extend at least 3 feet above the base flood elevation or highest known flood elevation, whichever is higher, for production wells that are installed within the 100-year flood zone.

N.H. Admin. Code § Env-Dw 305.25

Adopted by, Volume XXXVI Number 14, Filed April 7, 2016, Proposed by #11062, Effective 4/1/2016, Expires 4/1/2026.