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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page 13, Permit No. CO-0000221 5) General Information: The perndnee should read the WET testing sections under Pans I.A.4. and I.A.S. of the permit carefully. The permit outlints the tut requirematts and the required follow-up actions the perminee must take to resolve a toxicity incident. The permittee should read, along with the documents listed in Parts l.A.4.a. and I.A.S.a. of the permit, the Colorado Water OualiN Comrol Division Biomonitorine Guidance Documem, dated July 1, 1993. This documem outlines the criteria used by the Division in such areas as granting relief from WET testing, modifying test methods and changing test species. The ptrmiaee should be aware tha[ some of the conditions outlined above may be subject to change if the faciliry 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) Exemption for Surface Runoff Only - Outfall 009: The discharges from outfal! 009 contain surface runoff solely and do not comain tonic polGetams in tonic amounts. On this basis, WET testing is not a requirement for this outfall. However, the Division reserves the right to reopen the permit to include WET testing, should faciliry conditions change or if new information becomes available. 4. Storntwater Evaluation: Stormwater from active or inactive coal mining operations that has beers contaminated by contact with any overburden, raw material, imermediare products, fitished 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 Stormwater 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 facility's certification under the general permit became effective on March 22, 1996. The Seneca Mine Complex certification number is COR-040169. Since the requiremems for stormwater permits have just recemly become effective, the Division's policy is to cover as many facilities as possible that are included in the regulations, with general permits. For facilities that also have individual CDPS permits for discharge of process water, any applicable stormwater provisions would then be . included in individual CDPS permits at the time of individual permit renewal or application. The individual permit for discharge of process water far the Seneca Mine Complex, CDPS permit (No. CO-0000221), will contain stormwater provisions. When this permit becomes ejfecrive, certification COR-040169 will be inactivated. Under the terms of the combined individual permit (CO-0000221), Seneca Coa! Company will be authorized to discharge stormwater associated with industnal activity into waters ojthe State of Colorado. The terms and conditions of this permit, as related to stormwater discharges, include.• a. Se2rexation of Stormwater Discharges: Al! discharges covered by the stormwater portion of this permit shall be composed emirel} of stormwater (except as discussed at Part /.D.2.6.9 of the permit). Stormwater which mites with process water is subject to process water controls. Discharges from sources other than srormwater must be addressed by the process water controls in this CDPS permit. b. Stormwater Mana¢ement Plans (SWMPs1: The purpose of a SWMP is ro identif} possible pollutant sources that may contaminate stormwarer and to set out best management practices that, when implemented, will reduce or eliminate any possible water quality impacts. A SWMP must be maintained for the Seneca Mine Complex in accordance with goad engineering practices. The plan idemifies potential sources of pollution which may reasonably be expected to affect the quality of s[ormwater discharges associated with industrial activity. In addition, the plan describes and ensures the implementation of practices which are to be used to reduce the pollutants in stormwater discharges associated x~ith industrial activity at the faciliry, and assures compliance with the terms and conditions of this permit. Seneca Coa[ Company must implenem the provisions ojthe SWMP as a condition of this permit. Contents and requirements ojthe SWMPare discussed in the permit at Part /.D.2.b c. Compliance Dates: Seneca Coal Company was to have prepared the Seneca Mine Complex SWMP at the time of application . The plan was to 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.