"Biomat interface" means a biologically active layer that forms between the bottom of the bed and the underlying fill material or receiving layer or, in the case of large diameter graveless pipe systems, on the inside of the non-woven fabric wrap.
N.H. Code Admin. R. Env-Wq 1002.07
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08