1. (a) Plans for an ISDS shall be prepared by a permitted designer.
2. (b) Plans for an ISDS shall bear the seal of the permitted designer.

3. (c) The seal required by (b), above, shall be as follows:

   1. (1) The seal shall be circular in design with corner borders;
   2. (2) The seal shall be 1.9 inches in height;
   3. (3) The circular portion shall include the wording “New Hampshire” at the top and “Department of Environmental Services” at the bottom; and
   4. (4) The words “Designer of Subsurface Disposal Systems” and the name and permit number of the permitted designer shall be contained within the circular area.

4. (d) Subject to (e), below, an ISDS shall be designed by a permitted designer who is also a civil or sanitary professional engineer (P.E.) licensed in the state of New Hampshire if the ISDS is:

   1. (1) For a single structure for which the ISDS will have a design flow of greater than 5,000 GPD;
   2. (2) For a group of structures proposed to share an EDA for which the combined design flow is greater than 5,000 GPD;
   3. (3) Composed of multiple beds, each of which has a design flow of greater than 2,500 GPD;

   4. (4) On a ledge lot, and has a design flow of:

      1. a. Greater than 600 GPD for a commercial use; or
      2. b. Greater than 1,500 GPD for a residential use; or
   5. (5) A stone-and-pipe bed intended to be installed beneath a commercial driveway or parking area that is subject to American Association of State Highway and Transportation Officials (AASHTO) HS20 loading.
5. (e) Plans for an ISDS designed pursuant to (d), above, shall bear the individual’s designer seal as specified in (b), above, and P.E. seal as required by RSA 310-A:18.
6. (f) Plans for an ISDS required to be designed pursuant to (d), above, may be designed by a permitted designer who is not a P.E., but shall only be submitted to the department after being reviewed and approved by a P.E. who is also a permitted designer. For such applications, the plans shall bear the designer seal of the permitted designer who designed the ISDS and the P.E. seal of the P.E. who reviewed and approved the plans.
7. (g) As required by RSA 310-A:67, II, plans that involve the practice of land surveying as defined by RSA 310-A:54, IV shall bear the stamp and signature of a licensed land surveyor.
8. (h) For any ISDS designed pursuant to (d) or (f), above, that was approved with multiple connections to one or more EDAs, an application to connect to the EDA shall not require a P.E. stamp.

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