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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />Rationale - Page 8. Permit No. CU-UU3263H <br />2. Alternate Limitations <br />As indicated in other sections of the rationale, some <br />are or are not effective, dependent on occurrences of <br />permit indicates when specific limitations apply. In <br />permittee to claim a "storm exemption" from the total <br />total iron limitations, documentation of the eligible <br />submitted to the Division along with the appropriate <br />report (DMR). <br />3. Materials Containment Plan <br />effluent limitations <br />precipitation. The <br />order for the <br />suspended solids and <br />storm event must be <br />iischarge monitoring <br />Page 6 and 7 of the permit describe the Materials Containment Plan (MCP) <br />which is a requirement of all permittees. If a Spill Prevention Control <br />and Countermeasure (SPCC) Plan has already been submitted by the permittee <br />and approved by the Division, submittal of an annual update to this plan <br />will satisfy the MCP requirement. <br />4. Reopener Clause <br />. This permit may be reopened and modified as discussed in Part II.S.S if <br />there is a significant change in state or federal water quality <br />regulations, a significant change in operation at the facility, or at the <br />request of the permittee. <br />5. Reporting Requirements <br />In the past, the permittee leas been required to submit discharge <br />monitoring reports (DMR) on a quarterly basis. But, the new flows <br />authorized through this renewal permit are significant in volume and <br />contain heavy metals. For these reasons, reporting will be changed from <br />quarterly to monthly. This is consistent with other permits. Upon <br />issuance of this permit, new Dhllt's will be provided for the permittee. <br />6. Quarterly honitoring for Manganese and TDS <br />Ttie permit contains quarterly monitoring requirements for manganese and <br />total dissolved solids at outfalls U03 and U06. These spoils springs <br />discharges are relatively new. it has been shown that the quality of such <br />discharges can vary with time. Thus, while these parameters are not now <br />of concern, the quality could deteriorate in the future. The division <br />will periodically review monitoring results. If effluent limitations or <br />additional monitoring are required, tl~e permit will have to be reopened <br />and amended as appropriate. <br /> <br />Jon C. Kubic <br />November 6, 1'Jff6 <br />