1. (a) If a septic tank used in a gravity ISDS has 2 or more compartments, it shall meet the following requirements:

   1. (1) The first compartment equals at least 2/3 of the required volume for the septic tank; and
   2. (2) The total volume of all compartments equals or exceeds the liquid capacity required by Env-Wq 1010.01.

2. (b) If a septic tank used in a pump system is separated into 2 or more compartments, it shall meet the following requirements:

   1. (1) The first compartment equals at least 2/3 of the required volume of the septic tank; and
   2. (2) The total volume of the compartments, exclusive of the pump chamber, equals or exceeds the liquid capacity required by Env-Wq 1010.01.

3. (c) If a septic tank has more than one compartment, the following shall apply:

   1. (1) Venting between compartments shall be provided to allow free passage of gas;
   2. (2) Inlet and outlet baffles shall be at the inlet and outlet of each compartment or tank; and
   3. (3) The total storage above the liquid line in each compartment shall be as specified in Env-Wq 1010.09(a).

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