12VAC5-610-820: Miscellaneous

A. Multiple septic tanks in series. The required volume for a septic tank may be satisfied by the utilization of two septic tanks in series; however, the first septic tank in series shall equal to 1/2 to 2/3 the required total volume.

B. Physical and/or chemical systems. Physical or chemical systems, or both, utilized as pretreatment for subsurface disposal of sewage shall meet the applicable criteria contained in 12VAC5-580-930 through 12VAC5-580-960 of the Sewerage Regulations.

C. Water stop. A water stop is a method for sealing the annular space around a conduit or pipe, or both, for the purpose of preventing infiltration or exfiltration, or both. Conduits or pipes passing through the walls of a pretreatment unit shall be provided with a water stop.