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permit tee in Colorado. Therefore, EDF contends that it. is unreasonable and an abuse of the Division's discretion to fail to require monitoring which will demonstrate compliance with the applicable effluent limitations. This abuse of dis- cretion is rendered all the more egregious by virtue of the fact that the required monitoring establishes no basis whatso- ever for determining whether the 30-day average limitation is being met because that limitation is the only limitation of the two which ensures both compliance with the water quality standard and adequate protection of the public health. In addition to an abuse of discretion, EDF contends that to the extent the permit fails to require monitoring adequate to determine compliance with the applicable effluent limitations, the permit is unlawful on federal and state statutory grounds. Section 25-8-501(3), C.R.S. 1973, requires that state Fermit regulations "be consistent with...federal requirement...." The federal Clean Water Act requires that monitoring must to adequate to ensure compliance with applicable effluent limitations in a discharge permit: Whenever required to carry out the objectives of this chapter including but not limited to...(2) determining whether any person is in violation of any...effluent limitation, or other limitation, prohibition, or effluent standard...the Administrator shall require the owner or operator of any point source to (i) establish and maintain such records, (ii) make such reports, (iii) install, use and maintain such monitoring equipment or methods (including when appropriate, biological monitoring methods), (iv) sample such effluent...and (v) provide such other information as he may regsonable require. Section 308(a), Federal Clean water Act, 33 U.S.C. ].31E(a) (emphasis added) . The plain meaning of this language is that monitoring and sampling must be of sufficient frequency to determine H~hether the source in question is in compliance with applicable effluent limitations. Therefore, EDF contends that the failure t:o require monitorin5 ~?hich is adequate to determine compliance with applicable effluent limitations is inconsistent with the federal Clean 47ater Act and the requirement that state requirements be consistent with federal requirements for permits. -3-