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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division Rationale - Page 12. Permit No. CO-0000132. VI. TERMS AND CONDITIONS OF PERMIT Table VI-5 - 1onitoring Requirements - 011 Parameter Measurement Frequency Sample Type Flow, MGD Total Suspended Solids, Total Iron, mg/1 Oil and Grease, mg/1 pH, s.u. Total Dissolved Solids, Whole Effluent Tonicity Weekly mg/1 Weekly' Weekly* Weekly Weekly mg/1 Monthly/Quarterly (see VI.4) Acute Quarterly Instantaneous or Continuous Grab Grab Visual Grab Grab Grab *The monitoring frequency for these two parameters is greater than that req~iired at the other discharge points, since this i.s a new source. Once a data base is established for this point. (i.e., a minimum of twelve sample results), if compliauce with the permit limits is demonstrated, the permittee may request a reduction Sn monitoring frequency. 2. Reporting: Somerset Mining must submit a Discharge Monitoring Report DMR) on a quarterly basls to the Division. This report should contain the required summarization of the test results for parameters shown in Tables VI-4 and VI-5 and Part I.B.1 of the permit. See the permit, Part I.B for details on such submission. 3. Additional Monitoring and Reporting: At the time of permit renewal, there was no effluent available for sampling. Therefore, in order to determine the general quality of water discharged at this facility, the permittee shall be required to perform a one-time sampling at 011 for the list of parameters as contained in the renewal application, and for Total Residual Chlorine (see IV.B), as listed in Part I.B.11 of the permit. C. Additional Terms and Conditions 1. Materials Containment Plan: On December 11, 1985, the permittee submitted an engineered spill plan. An update to the plan is required to be filed xithin 90 days of the permit effective date, detailing all changes which have occurred since the original submittal. For specific requirements, refer to Part I.E of the permit.