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::a: .. .. .,y:•... .. COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page 13, Permit No. CO-00'00221 • 5) General Informorion: The permirtee should read the WET testing sections under Parts I.A.4. and 1.A.5. of the permit carefully. The permit outlines the rest requirements and the required follow-up actions the permittee must take to resolve a toxicity incident. The permittee should read, along with the documents listed in Parrs I.A.4.a. and I.A.S.a. of the permit, the Colorado Water Oualirv Control Division BiomonitorinA Guidance Documem. dared July 1, 1993. This document outlines the criteria used by the Division in such areas as granting relief from WET resting, modifying test methods and changing rest species. The permittee should 6e aware that some ojthe condirions outlined above may be subject to change iJ the facility experiences a change in discharge, as outlined in Part I/.A.2. of the permit. Such changes shall be reported ro the Division immediately. 6) Exemorion for Surface Runoff Only - Outfall 009.• The discharges from outfall 009 contain surface rtrnof( solely and do not contairs toxic pollutants in toxic amounts. On this basis, WEI'testing is nor a requirement for this outfall. However, the Division reserves the right to reopen the permit to include WET resting, I should facility conditions change or if new information becomes available. 4. Srormwater Evaluation: Stormwater from active or inactive coal mining operations that has been contaminated by contact with any overburden, raw material, intermediate products, finished products, byproducts or waste products located on the site of such operations is required to be covered by a Colorado Discharge Permit System (CDPS) permit in order to be discharged to Waters of the State. This coverage may be obtained under either a CDPS Industrial Wastewater Discharge Permit or a CDPS Srarmwater Discharge Permit. Seneca Coal Company submitted an application for a general permit for Metal Mining for the Seneca Mine Complex on February 23, 1996. This jacilirv's certification under the general permit became effective on March 22, 1996. The Seneca Mine Canplex certification number is COR-040!69. Since the requirements for storntwarer permits have just recemly become effective, the Division's police is ro cover as many facilities as possible Char are included in the regulations, with general permits. For facilities that also hai e • individual CDPS permits for discharge of process water, any applicable stormwarer provisions would then be included in individual COPS permits at the time of individual permit renewal or application. The individual permit for discharge of process water for the Seneca Mine Complex, CDPS permit (No. CO-0000221), will contain stormwater provisions. When this permit becomes effective, certification COR-040169 will be inactivated. Under the terms of the combined individual permit (CO-000022]), Seneca Coal Company will be authorized to discharge stormwater associated with industrial activity into waters of the State of Colorado. The terms and conditions of this permit, as related to stormwarer discharges, include: a. Se¢resation o(Stormwarer Discharges: AI! discharges covered by the stormwater portion of this permit shall be composed emirely ojstormx~ater (except as discussed at Part I.D.2.b.9 ojthe permit). Stormwater x~hich mixes with process water is subject to process water controls. Discharges from sources other than stormwarer must be addressed by the process water controls in this CDPS permit. b. Srormwater Management Plans (SWMPsI: The purpose of a SWMP is ro identrfv possible pollutant sources Char mm~ contaminate stormwarer and to set out best management practices that, x•hen implemented, will reduce or eliminate any possible water quality impacts. A SWMP must 6e maintained for the Seneca Mine Complex in accordance with good engineering practices. The plan identifies potential sources of pollution which mm reasonably be expected ro affect the qualirv of srormwater discharges associated with industrial activity. In addition, the plan describes and ensures the implementation of practices which are ro be used to reduce the pollutants irs stormwater discharges associated x~ith industrial activity at the jacilin~, arui assures compliance with the terms and conditions of this permit. Seneca Coal Company must implement the provisions of the SWMP as a condition of this permit. Contents and requirements of the SWMP are discussed in the permit at Parr I.D.2.b . • c. Compliance Dares: Seneca Coal Company was to have prepared the Seneca Mine Complex SWMP at the time of application . The plan was ro have been implememed by upon issuance of the certification. The SWMP shall be updated as appropriate. Certification that a SWMP was prepared for the Seneca Mine Complex was received by the Division on February 23, 1996.