New Hampshire Code of Administrative Rules
We - Water Well Board
Chapter We 600 - STANDARDS FOR THE CONSTRUCTION, MAINTENANCE AND ABANDONMENT OF WELLS
Part We 602 - NEW WELL CONSTRUCTION
Section We 602.37 - Closed Loop Geothermal Wells

Universal Citation: NH Admin Rules We 602.37

Current through Register No. 40, October 3, 2024

(a) The setback and protective well radius requirements specified in We 602.06 through We 602.12, shall not apply to closed loop geothermal wells.

(b) A closed loop geothermal well shall be located no less than:

(1) Fifty feet from a well used for potable water supply; and

(2) Twenty five feet from a septic tank or effluent disposal area.

(c) During advancement of the borehole, the licensed contractor shall follow the observation and record keeping requirements of We 602.20.

(d) The thermal loop used in the borehole shall be:

(1) Constructed of high-density polyethylene (HDPE) with heat fused couplings; or

(2) An equivalent loop material and couplings that can be demonstrated to reduce the potential for groundwater contamination by resisting degradation and leakage.

(e) The borehole shall be grouted as follows:

(1) The entire length of the borehole shall be grouted;

(2) The borehole shall be grouted in one, continuous effort from the bottom of the borehole using a tremie line;

(3) The grout used in the borehole shall be:
a. A high-solids bentonite grout;

b. A cement-sand based grout;

c. A bentonite-sand based grout; or

d. Any other grout that has been demonstrated to reduce shrinkage and cracking during multiple heating and cooling cycles; and

(4) The following materials shall not be used as backfill in the borehole when used alone:
a. Sand;

b. Gravel;

c. Pea-stone;

d. Drilling by-products; or

e. Other non-cemented or non-grouted, heterogeneous or homogenous mixture of aggregates.

Disclaimer: These regulations may not be the most recent version. New Hampshire may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.