2018-04-23_REVISION - M2007031 (4)

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COLORADO `_„` ,;y i Department of Public \.� Health&Environment Water Quality Control Division Fact Sheet,Permit No. C00048939 The quarterly monitoring frequency for low-level mercury is imposed consistent with the Divisions' recent initiative to include quarterly monitoring for mercury because of the changes in analytical procedure that will allow total mercury to be quantified at much lower concentrations. B. Reporting 1. Discharge Monitoring Report- The Scott Blue II Mine must submit Discharge Monitoring Reports (DMRs) on a monthly basis to the Division. These reports should contain the required summarization of the test results for all parameters and monitoring frequencies shown in Part I.A.2 of the permit. See the permit, Part I.D for details on such submission. 2. Special Reports - Special reports are required in the event of an upset, bypass, or other noncompliance. Please refer to Part II.A. of the permit for reporting requirements. As above, submittal of these reports to the US Environmental Protection Agency Region VIII is no longer required. C. Signatory and Certification Requirements Signatory and certification requirements for reports and submittals are discussed in Part 1.0.6. of the permit. D. Compliance Schedules No compliance schedules are included in this permit. F. Economic Reasonableness Evaluation Section 25-8-503(8)of the revised (June 1985)Colorado Water Quality Control Act required the Division to "determine whether or not any or all of the water quality standard based effluent limitations are reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons, and are in furtherance of the policies set forth in sections 25-8-192 and 25-8-104." The Colorado Discharge Permit System Regulations, Regulation No. 61, further define this requirement under 61.11 and state: "Where economic, environmental, public health and energy impacts to the public and affected persons have been considered in the classifications and standards setting process, permits written to meet the standards may be presumed to have taken into consideration economic factors unless: a. A new permit is issued where the discharge was not in existence at the time of the classification and standards rulemaking, or b. In the case of a continuing discharge, additional information or factors have emerged that were not anticipated or considered at the time of the classification and standards rulemaking." The evaluation for this permit shows that the Water Quality Control Commission, during their proceedings to adopt the Classifications and Numeric Standards for Arkansas Basin, Regulation No. 32, considered economic reasonableness. Furthermore, this is not a new discharger and no new information has been presented regarding the classifications and standards. Therefore, the water quality standard-based effluent limitations of this permit are determined to be reasonably related to the economic, environmental, public health and energy impacts to the public and affected persons and are in furtherance of the policies set forth in Sections 25-8-102 and 104. If the permittee disagrees with this finding, pursuant to 61.11(b)(ii) of the Colorado Discharge Permit System Regulations, the permittee should submit all pertinent information to the Division during the public notice period. XI. TERMINATION OF PERMIT COVERAGE Discharge remains Page 15 of 17 ,�c 4300 Cherry Creek Drive S.,Denver,CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe/wqcd * r;7 John W.Hickentooper,Governor I Larry Wolk,MD,MSPH,Executive Director and Chief Medical Officer CO STEW T/:': Sti:B'[ pautreaS