Laserfiche WebLink
COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />' ~ ,/ Rationale - Page 12 Permit No, CO-0043168 <br />7. Economic Reasonableness Evaluation: (Continued) <br />b) In the case of a continuing discharge, additional information <br />or factors have emerged that were not anticipated or considered <br />at the time of the classification and standards rulemaking. <br />The evaluation for this permit shows that the proposed discharge <br />from this facility was not in existence at the time of water <br />quality standards rulemaking. However, based on available data, <br />the resulting water quality standard-based effluent limitations are <br />determined to be reasonably related to the economic, environmental, <br />public health and energy impacts to the public and affected <br />persons. If the permittee disagrees with this finding, pursuant to <br />6.12.0(2)(b) the permittee should submit all pertinent information <br />to the Division prior to final issuance of this permit. <br />8. Stormwater: This permit (GO-0043168) does not address the <br />applicable stormwater requirements for this mining operation. A <br />separate stormwater permit application for this facility is <br />required to be submitted by October 1, 1992. <br />9. Permit Policy for Minine Activities: The permittee should be aware <br />of the Water Quality Control Division's Permit Policv for Minine <br />Activities (Policy f]o. WPQ•5), which became effective June 'c4, <br />1987. This policy addresses permitting requirements for <br />explczatory, active, and inactive mining activities, including the <br />iater permit inactivation procedures which need co be addressed. <br />One of the requiremen~s for the later inactivation of a mining <br />permit is that the historic vreminine (and vreexvloration) mass <br />loadine of the mine water discharee must be adequately <br />characterized for vrover assessement. In this mining policy, a . <br />permit for exploratory mining may be inactivated after termination <br />of activities if the effluent loading, without treatment, can be <br />shown to be statistically similar to the historic mass loading. A <br />permit for active mining may be inactivated after termination of <br />activities if the effluent, without treatment, can be shown to not <br />violate the water quality standards (WQS) of the receiving scream <br />segment(s) and beneficial uses as demonstrated by compliance with <br />permit limitations and applicable WQS. <br />The following are general provisions from this mining policy for <br />permit inactivation of exploratory or mining activities: <br />1. All activity at the site has ceased. <br />2. No treatment of any sort is allowed prior to the effluent <br />sampling point. <br />3. The Permits and Enforcement Section staff has reviewed the <br />inactivation submittals and determined that the data is <br />statistically similar (for exploratory facilities) or does not <br />