Section Env-Dw 302.35 - Replacing an Existing Large Production Well(a) A supplier of water proposing to replace an existing large production well with a new production well may do so under reduced regulatory requirements provided: (1) Supporting documentation is provided demonstrating that:a. A decline in yield from an existing production well prevents the system from maintaining the water supply source capacity requirements of existing customers; orb. Water quality in the existing well does not meet current drinking water standards and treatment is not possible or feasible; and(2) The replacement well shall:a. Not be used for water use beyond the approved or established capacity of the well to be replaced;b. Meet the requirements specified in Env-Dw 403.34; andc. Derive water from the same zone of contribution as the well that is being replaced.(b) A CWS proposing to replace any active large production well shall submit a request to the department that contains the following information: (1) A description of the project including: a. The applicant's name, mailing address, and daytime telephone number and, if available, an e-mail address and fax number;b. The consultant's name, mailing address, and daytime telephone number, if applicable and, if available, an e-mail address and fax number;c. The name of the water system;d. The federal identification number for the existing large production well being replaced; ande. The water supply requirements for the system.(2) A site plan and description of all land uses in the sanitary protective area of the replacement well and any measures taken to achieve compliance with Env-Dw 302.10;(3) A current tax map showing property boundaries, well location, eased areas, sanitary protective areas and lot owners;(4) A site plan and description of the replacement well in relation to surface water, wetlands and the 100-year flood zone and any department-approved measures, if applicable, taken to elevate the permanent well casing;(5) A general description of current water quality in the existing well, if available;(6) A plan for completing the following; a. Performance of a constant rate pumping test that conforms to Env-Dw 302.14(b); andb. Collection of water quality samples in accordance with Env-Dw 302.15; and(7) A plan for sealing the well that is to be replaced in accordance with We 600, provided that if the well will not or cannot be sealed the applicant shall submit a water conservation plan in accordance with Env-Wq 2101.(c) The department shall approve the replacement well, provided the supporting documentation and data submitted by the applicant demonstrates the following: (1) The applicant has provided the pumping test data and demonstrated a long-term sustainable yield for the replacement well;(2) The applicant has provided the water quality results and laboratory reports from the sampling conducted during the pumping test;(3) A statement has been provided by a NH licensed water well contractor that the existing well has been sealed in accordance with We 600, or a water conservation plan developed in accordance with Env-Wq 2101 has been approved;(4) The applicant has provided the department with a copy of the well completion report for the replacement well, filed in accordance with We 800;(5) The applicant has documented that sanitary protective area requirements, in accordance with Env-Dw 302.10, have been met, or improvements have been made to minimize the risk of contamination; and(6) The applicant has documented that the surface water setbacks established in Env-Dw 302.09 have been met, or improvements have been made to minimize the potential for surface water influence on water pumped from the replacement well.(d) The replacement well shall be approved for the previously approved or established capacity of the well being replaced or the long-term sustainable yield as tested, whichever is less.N.H. Admin. Code § Env-Dw 302.35
Adopted by, Volume XXXVI Number 14, Filed April 7, 2016, Proposed by #11061, Effective 4/1/2016, Expires 4/1/2026.