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COLORADO DEPARTMENT OF PUBLIC HEALTHAND ENVIRONMENT, Water ¢m(Uy Contro(Division Raiiona(e -Page 2, Permit No. CO-0027146 III. RECEIVING STREAM An assessment of the stream standards, low flow data, and ambient stream data has been performed to determine the assimilative ,opacities jot the Colorado River for potential pollutants of concern. This information, which is contained in Appendix A to this .~ationa[e, also includes an araidegradation review, where appropriate. The Division's Permits Unit has reviewed the assimilative capacities to determine the appropriate water quality-based effluent limitations as well as potential limits based on the antidegrada[ion evaluation, where applicable. The limitations based on the assessment and other evaluations conducted as part of this rationale can be found in Tables VI-I through VI-3 of this rationale. IV FACILITYDESCRIPTION A. Industry Description 1. Tvpe oflndustrv: This side was formerly an underground coal mine. The site is being reclaimed and much of the surface area has been returned to the required contours and revegetation. There continues to be discharges from the Roadside South mine portal. The Roadside Mine North portal was sealed and no discharge has occurred from that portal since being sealed. 2. Sources to the Treatment Plant: Mine water may be discharged from three outfalls from the Roadside South mine portal: 007, 002 and 016. Outfall 016 is the primary discharge point and Outfalir 001 and 002 are back-up points that may be used as the need dictates. Surface runoffflows to, and may be discharged from one of nine sedimentation ponds. However, runoff volumes are decreasing as reclamation progresses, so most of the runoff is contained and evaporated in the ponds. 3. Chemicals Used: The permittee did not specify any chemicals for use in waters that may be discharged. On this basis, no chemicals are approved under this permit. Prior to use ojany applicable chemical, the permtnee must submit a request for approval that includes the most current Material Safety Data Sheet (hfSDS) for that chemical. Until approved, use ojany chemical in waters that may be discharged could result in a discharge ofpollutanu not authorized under the permit. Also see Part II.A.1. of the permit. B. Wastewater Treatment Description The wastewater treatment system has not changed since the previous permit other than elimination of sedimentation ponds as a result of reclamation activities. Outjall 004 (Pond 6), which previously discharged mine water from the Roadside North mine, has been eliminated since the most recent permit amendment in October 2001. The area served by Outfall 013 (Pond 10), the Cameo Refuse Disposal Area 1, has been returned to proper contours and revegetation has begun, thus meeting the definition of apost-mining area found in 40 CFR Part 434, the Coal Mining Point Source E111uent Guidelines. The area served by Outfa11011 (Pond 7) had previously qualified as apost-mining area. As areas served by other outfallr meet this definitiors in the future, the permiaee cart request that the Division make appropriate amendmenu to the permit. Pursuant to the authority of Article 9, Title 15, Regulations far the Certification ojWater Treatment Plant and Wastewater Treatment Plant Operators, this facility requires a certified operator. Y. PERFORMANCE HISTORY A. MonitaringData 1. Discharge Monitoring Reporu: Tables V-1, V-1 and V-3 summarize the effluent data reported on the quarterly Discharge Monitoring Reports (DMRs) for the Snowcap Coal Company, Inc. Roadside Mine (North and South Portals) facility from Apri11001 through March 1003. J Lnst Revised: 1 //38003