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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Qunliry Control Division Rationale - Pnge 14, Permit No. CO-0038776 e. Annual Reoort: The perminee will be required to submit mr ammo[ report, covering Jmrunrv 1 through December 31 of each year, orr the overall compliance with the SWMP. 5. Economic Reasonnblerress Evaluntiotr: Section 15-8-503(8) ojrhe revised (June 1985) Colorado Water Otlnlin~ Control Act required the Division to "determine whether or not any or all of the venter quality standard bused e-Qluenr limitations are reasonably related ro the economic, environmental, public henlrh and eteergy impncrs ro the public and affected persons, and are in furtherance of the policies set jorrh in sections 25-8-192 n»d 25-8-/04. " The Regulations jot the State Discharge Permit S~srem, 6.1.0, further define this requirement uruler 6.12.0 and state: 'Where economic, environmental, public health and energy impacts to the public and affected persons hove been considered in the classificatioru and standards setting process, permits written to meet the srn»dnrdr mqv be presumed to have taktn into consideration economic factors unless: n1 Anew permit is issued where the di.cchnrge wac oat in existence at the rime ojrhe clnssificnlion nor/ .nnnr/nrd.c rulemaking, or 6J /n the case ojn continuing discharge, additional information or factors have emerged that were not nnticipnlerl or considered at the time ojrhe classification and standards rulemnking. " The evaluation for this permit shows that the Water Quality Control Commission, during their proceerlirrgs rn nrlolu the Classification and Numeric Standards for the Gunnison River Basin, ronsidered economic reasatlnblenesc. Funhermore, this is oar a new discharger and no new infarmnrion has been presented regarding the cln.ccifirnrioua mul standards. Therefore, the venter qunliry stardnrd-based effluent limitations ojthis permit rtre dererminerl to he reasorrnb[y related to the economic, environmental, public henlrh and energy impacts to the public nud nffeaerl percnn.c and are in furtherance ojrhe policies set josh in Sections 25-8-l02 mrd ]04. /j the perminee di.rngree.c with this fituling, puccunru ro 6.12.0(2J(bJ the perminee should submit all peninent itjonrmrinn to the Division during the public rmrice period. R. Monitoring E1Jluent Manitorine: E-Qluent monitoring will be required as shown irr Tables VI-7, VI-8, V!-9 nor! V/-!0. Rajer ru the permit jot locarioru of monitoring points. Table VI-7 -- Monitoring Requirements jot Oulfalls 002 and 004 Pammerer Measurement Frequency Sample Type Fluty, MGD Weekly btsrnntmteous or Continuous TSS, mg/P Monthly Grn6 Settleable Solids, mP/P Monthly Grnb Oil and Grease, mg/P Weekly Visual n/ pH, s. u. Weekly Grnb Tornl Residual Chlorine, mg/P Weekly Grab /OUTFACE 004 ONLY) TDS, mg/f Qunnerlp Grn6 Whole Effluent Toxicity, Acute Qunnerly Grnb lrotr (7'orn1J, mg/P Monthly Crnb u/ /Ja visib(t sheen it noted, a grab sample shall be rollene6 aruf analyitd for oil ar+d grease. fit ret++lu art to be repa~+ed on +ht DMR under parameter P0556.