1. (a) Except as allowed by (b) through (d), below, or by Env-Wq 1014.09, the bottom of the bed shall be at least 4 feet above bedrock or any other impermeable substratum.
2. (b) The bottom of the bed for systems other than failed shall be at or above the specified separation distance to bedrock or any other impermeable substratum 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 less than a 4-foot separation.

3. (c) When replacing a failed system serving a single-family residence or multi-unit residential structure where there will be no expansion of use, the following shall apply:

   1. (1) The bed bottom shall be as close to 4 feet above bedrock or other impermeable substratum as possible, and in no case less than 2 feet above bedrock or other impermeable substratum, if a conventional stone-and-pipe system, concrete chamber system, or drywell system is used; and
   2. (2) The bed bottom shall be as close to the specified distance above bedrock or other impermeable substratum as possible, and in no case less than 2 feet above bedrock or other impermeable substratum, for any bed using EDA 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 components can be used with less than a 4-foot separation in new applications.

4. (d) A system to replace a failed system serving a condominium shall be installed in accordance with (c), above, 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.

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