Section 11-55-28 - Monitoring(a) Any discharge authorized by an NPDES permit may be subject to monitoring requirements as may be reasonably required by the director, including the installation, use, and maintenance of monitoring equipment or methods (including, where appropriate, biological monitoring methods).(b) Any discharge authorized by an NPDES permit which:(1) Is not a minor discharge;(2) The regional administrator requests, in writing, be monitored; or(3) Contains toxic pollutants for which an effluent standard has been established by the Administrator under Section 307(a) of the Act, 33 U.S.C. § 1317, shall be monitored by the permittee for at least the items listed in subsection (c).(c) Monitored items: (1) Flow (in gallons per day or cubic feet per second); and (2) All of the following pollutants:(A) Pollutants (either directly or indirectly through the use of accepted correlation coefficient or equivalent measurements) which are subject to reduction or elimination under the terms and conditions of the NPDES permit;(B) Pollutants which the director finds, on the basis of available information, could have a significant impact on the quality of State waters;(C) Pollutants specified by the Administrator in regulations issued under the Act, as subject to monitoring; and(D) Any pollutants in addition to the above which the regional administrator requests, in writing, to be monitored.(d) Each effluent flow or pollutant required to be monitored under subsection (c) shall be monitored at intervals sufficiently frequent to yield data which reasonably characterizes the nature of the discharge of the monitored effluent flow or pollutant. Variable effluent flows and pollutant levels shall be monitored at more frequent intervals than relatively constant effluent flows and pollutant levels. [Eff 11/27/81; am and comp 10/29/92; Eff 09/23/96; am and comp 09/22/97; comp 01/06/01; am and comp 11/07/02; comp 08/01/05; comp 10/22/07; comp 6/15/09; comp 10/21/12; comp 12/6/13; am and comp 11/15/2014 ] (Auth: HRS §§ 342D-4, 342D-5; 33 U.S.C. §§1251, 1342, 1370) (Imp: HRS §§ 342D-2, 342D-4, 342D-5, 342D-6, 342D-55; 33 U.S.C. §§1251, 1317, 1342, 1370, 1251 - 1387; 40 CFR Parts 122; 123; 124, Subparts A and D; 125; §§122.41, 122.43, 122.48, 123.25(a))