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COLORADO DEPAR77NEM' OF HEALTH, Water Quality Control Division Rationale -Page 20, Permit 1Vo. CO-0034142 4. Stormwnter (contl 77re terms and conditions of this permit, as related w stormwnter drscharges, include: a. Se¢reration of StormK+ater Discharres: AU discharges rnvered by the storrnwnter portion of this pern[it shall be congwsed entirety of swrmwattr (except as discussed at Part I. C.4 of the. permit). Stornnvater which mixes •~vith process inter is subject to process Knter rnntroLs. Discharges from sources other than stotmwater mwst be addressed by the process water controls in this mPS permit. Areas not rnvered by the process Nnter controls are the flout roads, small aria etempnons, and mining areas wfiich were reclaimed prior to the state Mined Land Reclamation regulations taking effect. b. Storrnwatn hlana¢ement Plans lSWMPsI: The purpose of a SWMP is to identify possible pollutant sources that may contaminate stormKnter and to set out best management practices that, when implemented, will reduce or eliminate any possible water quality impacts. A SWMP has been developed for the Eagle Mine Complex. The SWMP shall be amended as necessary and kept current in accordance with good engineering practices. 7ht plan shall idem~ potential source of pollution which may reasonably be expected to affect the quality of storntwnter discharges associated with industrial activity. /n addition, the plan shall describe and ensure the implementation of practices which are to 6e used w redact the pollutanu in swrmwattr discharges associated with industrial activity at the facility, and to assure compliance with the turns and conditions of this permit. Cyprus Empire Carp. must implement the provisions of the SWMP as a condition of this permit. Contenu and requirements of the SWMP are discussed in Part 1. C of the permit. c. Compliance Dates: On September 7, 1993, Cyprus Empire Corp. submitted a SWMP, and cen~anon of its implementation, to the Division jar the Eagle Mine Complex. The SWMP shall be updated as appropriate. d. Comprehensive Facility /nspections: The permittee will be required to make a thorough inspection of their stormwater management system, at least twice per year (in the spring and fall). 7)iese inspections mart be documented and summarized in the annual report. (See Part 1. C.6 of the permit. J Annual Report: The permitree will be required to submit an annual report, covering January 1 through December 31 of each year, an the overall compliance with the SWMP. 5. Economic Reasonableness Evaluation: Section 25-8-503(8) of the revised (June 1985) Colorado Water Quality Control Act required the Division to "determine whether or cwt any or all ojthe water quality standard based ejJluent limitations an reasonably related to the economic, environmental, public health and energy rmpacts to the public and affected persons, and are in furtherance of the policies set forth in sec[ions 25-8-192 and 25-8-104. " The Regulations for rlie State Discharge Permit System, 6.1.0, junkier define this requirement under 6.12.0 and state: "Where economic, environmemal, public health and energy impacts to the public and affected persons have been considered in the class~ations and standards sexing process, permitr wrinen to meet the standards may be presumed to have taken into consideration economic factors unless: aJ Anew permit Ls issued where the discharge was not in existence at the time of the class cation and standards ruL^rnaldng, or bJ /n the case oJ'a continuing discharge, additional information or factors have emerged that were not anticipated or considered at the time of the clars~ation and standards rulemaking. "