Records of other chemical treatment shall be retained for at least 3 years.
N.H. Admin. Code § Env-Ws 304.11
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97; ss by #8360, INTERIM, eff 6-4-05, EXPIRES: 12- 1-05 ; ss by #8498, eff 11-30-05