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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Corurol Division ,. Rationale -Page /1, Permit No. CO-0027146 5) Surface Runoff Only: The discharges from outfalls 005, 006, 007, 008, 009, 010, 011, 012, 013 and 014 comain surface runoff solely and are not believed to comain toxic polhaams rn toxic amounts nor do they discharge during low flow periods. On this basis, WET testing is not a requirement for these outfalls. However, the Division reserves the right to reopen the permit to include WET testing iffaciliry conditions change or new injormaton becomes available. 4. Stormwater Evaluation: Stormwater from active and iwctive coal mining sites that has been contaminated by coNact with overburden, raw material, intermediate products, byproducts, finished products or waste products located at the site is requited to be covered by a Colorado Discharge Permit System (COPS) permit in order to be discharged to Waters of the State. This coverage may be obtained under either a COPS /ndustria! Wastewater Discharge Permit ar a COPS Slormwater Discharge Permit. Division records indicate that Powderhorn Coal Company has coverage for stormwater discharges from the Roadside Mine under a Genera! Stormwater Discharge Permit for stormwater discharges associated with metal mining activities, number COR-040175. Stormwater permitting issues for this facility will be handled separately by the Division's Stormwater Unit, although this permit may be reopened at a later date to incorporate stormwater provisions, if deemed appropriate. 5. Economic Reasonableness Evaluation: Section 25-8-503(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 bated eJJluem 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 forth in sections 25-8-192 and 25-8-104. " The Regulations for the State Discharge Permit System, S CCR 1002-67.0, Jurther define this requiremem under section 61.12.0 and state: "Where economic, environmemal, public 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 taken into consideration economic factors unless: a) Anew permit is issued where the discharge was not in existence at the time of the classification and standards rrtlemaking, or b) /n the case of a continuing discharge, additional information or factors have emerged that were not anriciprued or considered at the time of the classification and standards rulemaking. " Furthermore, this is not a new discharger and no new information has been presented regarding the classifications and standards. Therefore, the water quality standard-based effluent limitations of this permit are determined to be reasonably related to the economic, envirorunemal, public health and energy impacts to the public and aJjected persons and are in furtherance of the policies set fonh in Sections 25-8-102 and 104. If the permittee disagrees with this finding, pursuant ro 61.12.0(1) (b) the permittee should submit all pertinem information to the Division during the public notice period. B. Monitoring 1. (fluent Monitorine: E~7rtem monitoring will be required as shown in Tables VI-6, VI-7 and VI-8. Refer to the permit for locations of monitoring poims. Table V/-6 - Moaitorine Reoairemertc fnr Oatfa[Cc 001. 002. 001. 075 ,. . S .... lE .. :Parameter .. Measurement Fre enc 4u Y amP TYPe : ; :: :...:. Flow, MGD Weekly Instantaneous or CoNinuous TSS, mg/P Monthly Grab Total /ton, mg/Q Momhly Grab Oil and Grease, mg/Q Weekly Visual Q/ pH, s.u. Weekly In-situ