1. (a) In lieu of the individual vents, the park drainage system may be wet vented by means of a combination drain, waste, and vent system. Wet vented systems in which the trap for one or more lots is not individually vented shall be of sufficient size and provided with an adequate vent or vents to assure free circulation of air. Wet vented drainage systems may be permitted only when each such system conforms to Table 2268-1 and Table 2268-2 and all of the following requirements for such systems:

   1. (1) A wet vented drainage system shall have a terminal vent installed not more than fifteen (15) feet downstream from the uppermost trap on any branch line and shall be relief vented at intervals of not more than one hundred (100) feet or portion thereof.
   2. (2) Wet vented drainage laterals shall be not more than six (6) feet in length for three (3) inch diameter pipe and not more than fifteen (15) feet in length for four (4) inch diameter pipe.
   3. (3) No vertical drain pipe shall be permitted in any wet vented drainage system, except the tail pipe of the trap or riser of the drain inlet. Tail pipes shall be as short as possible, and in no case shall exceed two (2) feet in length.

Note: Authority cited: Section 18865, Health and Safety Code. Reference: Section 18873.1, Health and Safety Code.

History

1. New section filed 7-6-2004; operative 7-6-2004 pursuant to Government Code section 11343.4 (Register 2004, No. 28).