“Large-diameter graveless pipe (LDGP) system” means an ISDS where the effluent conduits are pipes that are at least 10 inches in diameter with perforations throughout their circumferences, wrapped in non-woven fabric material separated from the pipe by an intermediate layer, and embedded in sand, such that the biomat interface is formed on the inside of the non-woven fabric.

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 (formerly Env-Wq 1002.40)