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COLORADO DEPARTMENT OF PUB. HEILTN AND ENVIRONMENT, Water Qr. y Control Division Rationale -Page 10, Permit No. CO-0042161 /f the tosieiry is due to differences in the growth of the fathead minnows or the reproduction of the • Ceriodaphnia, no immediate anion on the part of the permittee wiB be required. However, this inctdein, along with other WET data, will be evaluated by the Division and may farm the basis jot reopening the permit and including additional WET limits or other requirements. 4J Genera! Information: The permittee should read the WET testing sections of Part /.A. and I.B. of the permit carefully. The permit oinlines the test requirements and the required follow-up actions the permiaee must take to resolve a tosiciry incidein. The permittee should read, along with the documeins listed in Part f.B of the permit, the Colorado Water Oualirv Control Division Biomonitorine Guidance Doeumein. dated !u!y 1, 1993. This document outlines the criteria used by the Division in suds areas as graining rclieffrom WET testing, modifying test methods and dutnging test species. The permittee should be aware that some of the conditions outlined above may be subject fo drange ijthe fadliry tsperienees a d[ange in disdwrge, as outlined in Part ILA.1 of the permit. Sudt dranges shall be reported to the Division immediately. 5J Outfall 002: Because this ainfall consists afdomes~ic effluein with no industrial rontribtuion and because the drsrharge does not go directly to State waters, WET testing is not a requirement for this outfalL However, the Division reserver the right to reopen the permit to include WET testing, should jad(iry conditions change or if new information becomes available. 4. Srormwater• Because the Division already combine coverage ojrhe site of the Tweinymile Coal Company Foide! Creek Mine operation and the site ojrhe Cyprus Yampa Coa! Corporation's Mines 1, 2 3 South and Edmtan Park Mine operations under the General Stormwater Permit for Mining Activities, the permittee has requested that the general permit coverage coininue. This wiU be grained, ar a reruG no stormwater requirements will be roinained in this permit. 5. Economic Reasonableness Evaluation: Section ZS-8-503(8) of the revised (June 1985) Colorado Water Oualirv Control Act required the Division to 'determine whether or not any or all of the water quality standard based • ejjluein limitations are reasonably related to the eroromie, environmental, public health and energy impacts to the public and affected persons, and arc in furtherance ojrhe policies sa forth in sections 25-8-192 and 25-8-104.' the Regulations for the State Disdtarge Permit System, 6.1.0, further define this requiremntt under 6.12.0 and state.• 'Where eronomic, environmeinal, public heath and energy impacts to the public atd affected persons have been considered in tha clarsifrcations and standards setting process, permits written to meet the standards may be presumed to have taken iino consideration eronomic factors un4ss: aJ Anew permit rs issued where the disdtarge was not in aistence at the time ojrhe class cation and standards rulemaking, or bJ In the care of a continuing durharge, additional information ar jactars have emerged that were not ainidpated or considered at the time of the class~cinion and standards rulemaking. ' The evaluation for this permit shows that the Water Quality Comrol Commission, during their proceedings to adopt the CiarsiJication and Numeric Standards for the Upper Colorado River Basin, considered eronomie reasorwbleness. Funhermore, this is not a new disd[arger and no new information has been presented regarding the clav~cations and standards. Therefore, the water quality standard-based e~Iuein limitations of this permit are detnmined to be reasonably related to the economic, environnteinal, public health and energy impacts to the public and affected persons and are in furtherance of the policies set forth in Sections ZS-8-102 and 104. If the permittee disagrees with this finding, pursuant to 6.12.0(1)(6) the permittee should submi[ all pertinent information to the Division during the public notice period •