1. (a) For conventional systems:

   1. (1) Except as allowed by (b) through (f), below, or by Env-Wq 1014.09, the bottom of the bed for new conventional stone-and-pipe systems, stone-and-pipe trenches, concrete chambers, or dry well systems shall be at least 4 feet above the seasonal high water table (SHWT); and

   2. (2) The bottom of the bed for stone-and-pipe systems and concrete chambers for residential use shall be at least 24 inches above SHWT in accordance with RSA 485-A:29, I(d) if:

      1. a. Under a stone-and-pipe bed, there is a minimum of 6 inches of sand meeting the ASTM C-33 specification or an equivalent approved by the department; and
      2. b. The distance above the SHWT is maximized to the extent practicable.
2. (b) For systems containing innovative or alternative technology, the bottom of the bed for new and replacement systems shall be at or above the separation distance to the SHWT for any EDA using components that have been approved with reference to a manual pursuant to former Env-Ws 1024 or approved pursuant to Env-Wq 1024, where the approved manual or approval, respectively, specifies that the component can be used with other than a 4-foot separation distance from the SHWT for a bed bottom.
3. (d) For a system that will replace a failed system serving a single-family residence or multi-unit residential structures, where there will be no expansion of use, the following shall apply:
4. (1) The bottom of the bed of the replacement system shall be as close to 4 feet above SHWT as possible, and in no case less than 2 feet above SHWT, if a conventional stone-and-pipe system, stone-and-pipe trench, chamber system, or drywell system is used to replace the failed system; and
5. (2) The bottom of the bed shall be as close to the specified distance above SHWT as possible, and in no case less than 2 feet above SHWT, for any EDA using components that have been approved with reference to a manual pursuant to former Env-Ws 1024 or approved pursuant to Env-Wq 1024, if the approved manual or approval, respectively, specifies that the ITA component can be used with other than a 4-foot separation in new applications.

6. (e) Replacements for a failed system serving a condominium shall be installed in accordance with Env-Wq 1014.07(c) and (d) if:

   1. (1) The condominium meets the criteria of Env-Wq 1003.11(c); and
   2. (2) There will be no expansion of the condominium or of the size or use of the individual units in the condominium.
7. (f) For any ISDS serving a commercial use or a combined residential and commercial use, the bottom of the EDA shall be at least 48 inches above the SHWT, and the footprint shall be in accordance with Env-Wq 1016 if a conventional stone-and-pipe system or chamber system, unless an approved ITA component with a decreased footprint or separation distance to the SHWT is approved for the use.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36