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COLORADO DEPARTMENT OFPUBLIC HEALTHAND ENVIRONMENT, W¢ter Quality Control Division <br />Rrstionale-Page 2, Permit No. CO-0038776 <br />2. Sources to the Treatment Plant:. Table II-I shows the active ouffalls, their purposes, and other relevant information about the <br />treatment sources. ere are no new sources since the latest permit amendment although some minor changes have occurred. <br />This is discussed in the next section. <br />3. Chemicals Used: The permittee specified aluminum sulfate ar a chemical that may be used in mine wafer treatment for <br />occu anon; owever, they stated that no chemical treatment has been a plied since Outfall 013 came on-line in 1797. <br />Aluminum sulfate i.r acceptable for use as recommended by the manufacturer~r site-specific use. <br />Prior to use of any additional chemical, the permittee must submif a request for approval that includes the most current <br />Material Safety Data Sheet (MSDS) for that chemical. Until approved, use of any chemical in waters that may be discharged <br />could result in a discharge ofpollutants not authorized under the permit. Also see Aari ILA.1. of the permit. Chemicals deemed <br />acceptable for use in waters that will or may be discharged ro waters of the State are acceptable only when used in strict <br />accordance with the manufacturer's site-spec~c instructions. <br />B. Wastewater Treatment Description <br />The following changes to the wastewater treatment system have occurred: <br />Sediment ppond MB-4 (Outfall 008) has been relocated and lined with concrete. Sediment ponds MB-2R (Outfall 004) and MB-3 <br />(Outfa110715) have been lined with geotextile clay. Sediment ponds MB-/ fOuifall 016), RPE (Outfa11015), SG-1 (Outfall 014), and <br />the polishingponds for.the domestic WWTF (internal Outfa l 007) and the Dewatering Borehole Facility (Outfall 0 7) have been <br />lined with polyvinyl chloride (PVC) liners. <br />Pursuant to the authority o~ Article 9, Title 25, Regulations for the Certification of Water Treatment Plant and Wastewater <br />Treatment Plant Operators, t is facility will require a certified operator. <br />V. PERFORMANCE HISTORY <br />A. Monitoring Data <br />1. <br />Last Revised: 4//92004 <br />