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COLORADO DEPARTMENT OF PUBLICHEALTHAND ENVIRONMENT, Water Quality Control Division Rationale -Page 10, Permit No. CO-0032115 Table VI-6 - Flow, MGD Once per week Instantaneous or Continuous TSS, mgR ,Once per month Grab pH, s. u. Once per week In-Situ Oil and Grease, mgA Once per week Visual TDS, mg/1 Once per quarter Grab Settleable Solids, ml/1 Once per month Grab Iron, Total, ug/1 Once Der month Grab Flow, MGD Once per week Instantaneous or Continuous pH, s. u. Orsce per week In-Situ Oil and Grease, mgQ Once per week Visual TDS, mg/l Once per quarter Grab Settleable Solids, mlR Once per month Grab Monitoring requirements are based on the previous permit. 2. Additional Monitoring: As described in section VLA.Z.d.i., a 12-time analysisjorseveral metals is needed to determine reasonable potential for several outfalls. The following table identifies the outfalls and metals. The first sampling shall occur during the, first month after the permit becomes effective and sampling shall continue for the next eleven. consecutive months, unless discharge does not occur during that first month. If no discharge occurs during a month, sampling shall begin (or resume) when discharge resumes and continue until twelve samples have been collected and analyzed using approved methods with method detection limits as low or lower than those specified in Part LE.3. of the permit. Ijthe permittee has a recent data base (1998 or more recent) that includes these parameters for one or more outfalJs, these previous data may be included as applicable. For example, ifthe perminee has 8 recent data points for outfa/1011 for one or more of the specified metals, they can obtain 4 additional data points by sampling monthly after the permit becomes effective, then submit the recent data with the new data. All raw data shall be submined, notjust summaries. Table VI-8 -Twelve-Trine Monitoring Requirements Parameter OutjaU 011, 017, 019, 020, 021, 023 TR Arsenic X TR Cadmium X Total Tri Chromium X TR Copper X TR Lead X TR Selenium X TR Zinc X C. Reporting 1. Discharge Monitoring Renort: Trapper Mining, Inc. shall submit Discharge Monitoring Reports (DMRs) on a monthly basis to the Division. The Divrsion now requires all permittees to submit DMRs monthly. These reports should contain the required summarization of the test results for parameters shown in Tables VI-S, VI-6, and VI-7 and Part IB.1 of the permit. See the permit, Part LE.1. for details on such submission. 2. Additional Resorting: The results of the twelve-time analysis describedpreviouslysha1l be submitted as required. 3. Soecial Reports: Special reports are required in the event ofa spill, bypass, or other noncompliance. Please refer to Part LE. of the permit for reporting requirements. As above, submittal of these reports to the US Environmental Protection Agency Region Y/II is no longer required. D. Additional Terms and Conditions Las( Revised: 3/22/2004