1. (a) If approval of a replacement ISDS is obtained pursuant to Env-Wq 1004.19 relative to systems in failure, the replacement ISDS shall be installed prior to the expiration of the approval as specified in Env-Wq 1004.19(d).

2. (b) If approval of a replacement ISDS has been obtained pursuant to these rules for any reason other than to address a system in failure as covered by (a), above, the replacement ISDS shall be installed if the existing ISDS:

   1. (1) Has not received construction approval and approval to operate under these rules or predecessor rules in Env-Ws 1000, unless:

      1. a. The applicant submits documentation to show the existing ISDS was repaired or replaced in kind in compliance with requirements in place at the time the work was done; or

      2. b. All of the following requirements are met:

         1. 1. A permitted designer inspects the existing ISDS and provides documentation that it is not in failure and that no waivers for setback distances to the seasonal high water table, surface waters, or wetlands with very poorly drained soils are needed;
         2. 2. The septic tank either meets the minimum tank capacity requirements in Env-Wq 1010 or a septic tank meeting the minimum requirements is installed under a separate construction approval and receives an approval to operate;
         3. 3. The existing ISDS has a calculated flow of not more than 600 gallons per day; and
         4. 4. A gravity grease interceptor is either not needed or, if needed for the existing use, is installed with a separate construction approval and receives an approval to operate; or
   2. (2) Fails after receiving construction approval or otherwise needs to be repaired or replaced.

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 (formerly Env-Wq 1004.21)