"Control manhole" means a structure through which industrial wastes can be monitored and sampled.
N.H. Admin. Code § Env-Wq 1202.13
#8235, eff 12-22-04 (See Revision Note at chapter heading for Env-Wq 1200) (formerly Env-Ws 1202.13); ss by #9798, ef 10-9-10 (from Env-Wq 1202.12)