HYDRO31322 - Laserfiche WebLink

Home Browse Search

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division Rationale -Page 2, Permit No. CO-0032638 III. RECEIVING STREAM Art assessmeru of the stream statadmds, low flow data, and ambient stream data has been performed to determine the assimilative capacities for Trout Creek and tributaries for potential pollutants of concern. This information, which is contained in Appendix A to this rationale, also includes an antidegradation review. The Division's Permits Section has reviewed the assimilative capacities to determine the appropriate water quality-based effluent limitations as well as potential limits based on the antidegradation evaluation. The limitations based on the assessment and other evaluations conducted as part of this rationale can be found in Tables VI-I tluough YI-4 of this ratiotale. Outfalls 004A and 007A will continue to be the authorized discharge points for this permit. Outfalls MONI and MON2 are required to collect data for certain parameters for a future reasonable potential analysis. However, as this facility is under final reclamation, and the permittee is expected to fle for bond release, the monitoring frequency for the MON outfalds will be semi- annually. This way, if band release cannot be granted, there will be enough data for a reasonable potential analysis for all metals during the next permit renewal. Note [hat Outfall OOIA was eliminated from the previous permit as part of a permit amendment. IV. FACILITYDESCRIPTION A. Industry Description /. woe oflndustrv: The facility is a reclaimed surface coal mine. Surface wrens have been rentrned to proper condours and vegetation is growing. The Colorado Division of Minerals and Geology reports that the site may be fully released from bond in the near future. 2. Sources to the Treatment Plant: Sources are surface runofffrom precipitation events (rainfall and snowmelt) and spoils spring water. The latter is generated when groundwater surfaces through areas in which mining spoils have been deposited. 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 of any applicable chemical, the permittee must submit a request for approval that includes the most current Material Safety Data Sheet (MSDS) for that chemical. Until approved, use of any chemical in waters Chat may be discharged could result in a discharge of pollutants not authorized under the permit. Also see Part ILA. /. of the permit. B. Wastewater Treatment Description Outfall 004A is the discharge from a Moffat Ponrl, which receives surface runoff and spoils spring water. Outfa11007A is the monitoring point in Koll Ditch #3, an ditch owned and controlled by the permittee, at a point prior to the ditch flowing into Trout Creek, Three former outfalls (002, 003, and 006) discharge into Koll Ditch #3 above this point, with sources from surface runoff and spoils spring water. Outfa11007A was created to simpl fy monitoring requirements for the permittee since they all ender the unclassifted Koll Ditch #3, which is part of the treatment facility and serves as a conveyance to Trout Creek. Pursuant to [he authority ofArticle 9, Title 25, Regulations for the Certification of Water Treatment Plant and Wastewater Treatment Plant Operators, this facility will require a certifted operator. V. PERFORMANCE HISTORY A. Monitoring Data 1. Discharge MonitorinP Reports: Tables p-1 and Y-2 summarize the effluent data reported on the monthly Discharge Monitoring Reports (DMRs) for Outfalls 004 and 007 for the Edna Mine from April 2001 through November 2006. The pH data is from n period of record of March 2003 to March 2005 (during an amendment to the previous permit, pH was left off of the new DMRs, this data was submitted to the Division from the permittee in April 2005).