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Page COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale -Page 7 Permit No. CO-0045675 to, the wastestreams being permitted. IV.A.1. Industry Description (Cont.) 2. Type o1 Mining Aetivitv: Mining began at the site in Spring 1990 and ceased in October 1996. There are no current mining operations or activities ongoing at the site. Reclamaa'on activities have been underway since cessation of mining activities in 1996. However, the DMG reclamab'on bond has not been releasetl. B. Wastewater Treatment Facllfty Description: 1. Wastewater Treatment , taro: The following processes are applied in the wastewaterVeatment system: water softening, three lined mixing/softening ponds, membrane separation system, and chemical precipitation. These processes are operational. The treatment facility is designed to reduce levels ofmanganese, suNate, and fluoride, and will also maintain other parameters at the required levels. Flow Measurement: Dudng tha operation of the permanent San Luis water treatment plant, water flow data will be gathered at a number ollocations. A flow totalizer has been placed in the discharge pipe from the plant. Although BMRI has multiple flow monitoring devices wfthin the treatment train for operational purposes, the only flow measurement that is applicable for this discharge permit is the flow measurement device in the discharge pipe. 2. Chemicals Used: Table IV-1 lists the chemicals used at this facility as indicated in correspondence from the permittee and updated information (or the permit application. Table /V-1 -Chemical Additives Chemical Name or 'Constituents Purpose Final Dlsposldon Type Lime Calcium Hydroxide Metals P2cipttatian Precipitation and Disposal Caustic Soda Sodium Hydroxide pH control 001 Discharge Munatic Acid Hydrochladc Acid pH control 001 Discharge Scale Inhibitor Acrylic Polymer, Pralreafinent chemical for use in 001 Discharge Phosphoric Acid reverse osmosis / nanofilfrafion system 9ahum Carbonate 9adum Carbonate Sulla(e Precipitation Precipitation and Disposal EDTA 100 EDTA Chelatinp Agent 001 Discharge Salium Chbrida Sodium Chbdde Membrane Claener 001 Discharge Carton Dioxide (pas) Carbon Dioxide (pas) pH control 001 Discharge BioLleen 571 NifriloViacefic Aud, fdsodium salt Surtaclanl n+lydmxyefhylenediamine Idacelic acid, Reverse Osmosis Membrane 001 Discharge fdsodium salt Leaner Tdefhanolamine Mancethanolamine Dodecylbenrene SullaniC Acid Soda Ash Sodium Carbonate Wafer Sokaning Precipitation and Disposal V. PERFORMANCE HISTORY A. Monltoring Data 1. Dlscharoe Monltoring Reoorts and Self-Monitored Regorting Data: Since this is a new permit, no routine discharge monitodng reports have been submitted yet. However, BMRI has commenced Veatment o/the contaminated groundwater in the West Pit and discharges this treated water under the terms of the Amendment No. 1 to the Notice of Violation and Cease and Desist Order (NOV/CDO), which was issued on October 8, 1999. This Amendment to the NOV/CDO requires that biweekly reports of the discharge be submitted to the Division. Discharge from the system and initiation of the two-week start up period began on October 13, 1999. Daily effluent sample collections were initiated at that time with those sample collections 6eing analyzed for the folowing parameters: pH, flow, sulfate, dissolved manganese, and fluoride.