1. (a) The plan for an ISDS that has received construction approval from the department shall be the final ISDS plan.
2. (b) The department shall not approve an ISDS for operation if the ISDS as installed does not match the final ISDS plan, unless approval of an amended plan is allowed pursuant to (d) and (e), below.

3. (c) If an ISDS cannot be installed in accordance with the final ISDS plan, then prior to the installation:

   1. (1) The installer shall inform the permitted designer of the final ISDS plan of the reason that proposed modifications to the ISDS are necessary;
   2. (2) The permitted designer shall review the proposed ISDS modifications and shall inform the installer of the methods and materials that shall be used to address the proposed modifications; and
   3. (3) The permitted designer shall prepare and stamp an amended plan.

4. (d) The amended plan prepared pursuant to (c)(3), above, shall be submitted to the field inspector for approval at the time of inspection of the ISDS if no waivers are required and the modifications are limited to one or more of the following:

   1. (1) One or more components of the ISDS have been moved, but the design intent, footprint, configuration, horizontal location, and elevation of the bed bottom are as shown on the approved plan;
   2. (2) The installer substituted a different brand of component for the brand of the component that is specified in the approved plan;
   3. (3) The location or type of foundation has changed and the sewer pipe has been extended from the septic tank to the edge of the foundation;
   4. (4) A ledge tank has been substituted for a standard tank in accordance with Env-Wq 1010.13;
   5. (5) The well is not installed in the location shown on the approved plan but the actual location of the well does not affect the lot loading calculation; and
   6. (6) The tie points or benchmark are not as shown on the approved plan, and the designer has re-established them in a new location.

5. (e) The amended plan prepared pursuant to (c)(3), above, shall be submitted to and approved by the design review staff of the department prior to requesting an inspection if:

   1. (1) One or more components of the ISDS have been moved and the configuration or footprint of the bed has changed, but the bed bottom has not changed;
   2. (2) One or more components of the ISDS have been moved and the horizontal location of the bed is moved not more than 10 feet, but the bed bottom has not changed;
   3. (3) The horizontal location of the bed is moved not more than 10 feet but the footprint of the bed continues to be within 20 feet of the original test pit;
   4. (4) A septic tank is added or a single-compartment tank is replaced with a multi-compartment tank due to the installation of plumbing fixtures in a below-grade level of the structure, and the amended plans comply with Env-Wq 1010.01(l);
   5. (5) The designer of record will change subject to (g) below;
   6. (6) A waiver is required for modifications to the horizontal location of the bed;
   7. (7) A waiver request or modification to an approved waiver request is required for modifications to the ISDS;
   8. (8) The well is not installed in the location shown on the approved plan and the actual location of the well changes the lot loading calculation to less than what is required for the proposed or existing flow per Env-Wq 1004.13;
   9. (9) An ISDS approved as a pump system has been converted to a gravity system;
   10. (10) The use of the structures served by the ISDS on the approved plan has changed but still meets the requirement of Env-Wq 1004.22; or
   11. (11) The change or changes are not covered by (d) or (f).

6. (f) The amended plan prepared pursuant to (c)(3), above, shall require a new construction approval, which shall be obtained by the permitted designer submitting a new ISDS application to the department, if:

   1. (1) The bed bottom will change;
   2. (2) The horizontal location of the bed needs to be moved more than 10 feet or is no longer in accordance with Env-Wq 1006.01(b);
   3. (3) A waiver to wetlands with very poorly drained soils or surface water is needed;
   4. (4) The EDA type will change;
   5. (5) An effluent pump will be added to a gravity ISDS;
   6. (6) A new septic tank is required because of a phased development; or
   7. (7) A new septic tank was required by the construction approval but the existing septic tank will continue to be used in accordance with Env-Wq 1010.15.

7. (g) If an amended plan needs to be submitted to the department pursuant to (d) or (e), above, but the permitted designer who prepared the original approved plan is not available to prepare the amended plan for a reason that is not known to be temporary, such as death, relocation, or loss of their designer permit, the ISDS owner shall either:

   1. (1) Hire a different permitted designer willing to take responsibility for the plan in its entirety and have the new designer submit an amended plan, together with written correspondence bearing the stamp and signature of the designer responsible for the amendment stating the reason(s) why the original permitted designer is not available; or
   2. (2) Surrender the construction approval that was based on the original plan and have a different permitted designer submit a new ISDS application.
8. (h) If amended plans are submitted, the plans shall include a minimum of 2 tie points. Tie points on amended plans shall be from permanent features on the property and shall be for the purpose of locating the septic tank. Tie points shall include dimensions measured to the nearest 0.1 inch and be taken from the tie point to a point on the component of the ISDS that is relocated.

Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; amd by #12716, eff 1-24-19; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36 (formerly Env-Wq 1004.08)