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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Conrol Division Rationale -Page 8, Permit No. CO-0044776 Division records indicate that Bowie Resources, Ltd. has coverage for stormwa[er discharges from the Bowie Mine under a General Srormwater Discharge Permit for stotmwater discharges associa[ed with mehzl minis;; activities, number COR-040078. Stormwarer permitting issues for this faciliry will be handled separately by the Division's Stormwater Unit, although this permit may be reopened at a later date to incorporate st0,rntwater provisions, if deemed appropriate. 4. Economic Reasonableness Evaluation: Section 25-8-503(8} of the revised (June 1985) ~olorad Water Oua,fgy Control Act required the Division to "determine whether or trot any or all of the water quality standard based effluent limitations are reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons, and are in furtherance of the policies set for[h in sections 25-8-192 and 25-8-104. " The Colorado Dtscharge Permit System Regulations (Regulation No. 61) further define this requirement under 61.11 and state: "Where economic, environmental, public health and energy impacu to the public and affected persons have been considered in the classifications and standards setting process, permits written to meet the standards may be presumed to have taken into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence ar the time of the classification and standards rulemaking, or b) In the case of a continuing discharge, additional information or factors have emerged that were nor anticipated or considered at the time of the classification and standards ru/emaking. " The evaluation for this permit shows that this is a new faciliry nor in existence at the time of water quality standards rulemaking. However, based on available data, the resulting water quality standard-based effluent limitations are determined to be reasonably related to the economic, environmental, public health, and energy impacts to the public and affected persons. If the permirtee disagrees with this finding, pursuant to 6.12. D(2) i7~) the permtttee should submit all pertinent information to the Division during the public notice period. B. Monitoring F',~juent Monitorin¢: E,~luent monitoring will be required as shown in Table VI-4. Refer to the permit for locations of monitoring poims. Table VI-4 -Monitoring Requirements for Outfalls 001-003 .............. . ,. Parameter.•.: :: '' Measuriinetit.Freaitertev :: .::Samale Tv7ie ' Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mg/P Monthly Grab Totallron, mg/P Monthly Grab Settleable Solids, mP/P Monthly Grab Oil and Grease, mg/P Weekly Visual pH, s. u. Weekly In-situ TDS, mg/P Quarterly Grab • Whole EjJluent Toxicity, Acute (Ourfatt Quarterly Grab