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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page 8, Permit No. CO-0044776 Division records indicate that Bowie Resources, Ltd. has coverage for stormwater discharges from the Bowie N2 Mine under a General Stormwater Discharge Permit for slormwater discharges associated with metal »tining activities, number COR-040078. Slormwater permitting issues for this facility will be handled separately by the Division's Stormwater Unit, although this permit may be reopened at a later dale !o incorporate stormwater provisions, if deemed appropriate. 4. Economic Reasonableness Evaluation: Section 25-8-503(8) of the revised (June 1985) Colorado Water Quality Control Act required the Division !o "determine whether or not 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 iii furlterance of tl:e policies set forth in sections 2.i-8-/92 and 25-8-104." The Colorado Discharge Permit System Regulations (Regulation No. 61) further define this requirement under 61.11 and state: "Where economic, environmental, pteblic health and energy impacts 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 rakett into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence at the lime of tl:e classification and standards rulentaking, or b) In tl:e case of a continuing discharge, additional information or factors have emerged that here not anticipated or considered at the time of the classification and standards rulernaking. " The evaluation for this permit shows that this is a new facility not in existence at the time of water quality standards rulemaking. However, based on available date, the resulting water quality standard-based effluent limitatioru are determined to 6e reasonably related [o the economic, environmental, public health, and energy impacts to the public and affected persons. If the permtttee disagrees with this finding, pursuant to 6.12.0(2)(6) the permtttee should submi! al[ perinent information to the Division during the public notice period. B. Monitoring EOiuent Monitoring: Effluent monitoring will be required as shown in Table VI-4. Refer to the permit for locations of monitoring points. Table V/-4 -- Monitoring Requirements for Outfalls 001-003 Parameter Measurement Frequency Sample Type Flow, MGD Weekly Instantaneous or Continuous Total Suspended Solids, mg/P Monthly Grab Total Iron, rng/P Monthly Grab Settleable Solids, mP/P Monthly Grab Oil and Grease, mg/F Weeky Visual pH, s. u. Weekly /n-situ TDS, mg/P Quarterly Grab Whole Effluent Toxicity, Actt[e (Outfall Quarterly Grab 002 only)