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Storm Water Management Plan (SWMP), September 2012 GCC Energy – King Coal & King II Mines 15 SECTION 6: SWMP MODIFICATIONS The SWMP document is considered a “living document” and as such it is necessary to modify and update the document in response to corrective actions or changing conditions. If any of the following conditions occur, the SWMP must be reviewed and storm water control measures may need to be re-designed, and/or additional measures implemented so that the condition will not occur again. A SWMP Amendment Log (Form) is included in Appendix B.  An unauthorized release or discharge (e.g. a spill, leak or discharge of non- storm water not authorized by this or another NPDES permit) occurs at the facility;  A discharge exceeds a numeric effluent limit;  Facility staff become aware, or CDPHE determines that the storm water control measures are not sufficient for the storm water discharge from the facility to meet applicable water quality standards;  An inspection or evaluation of the facility by an EPA or CDPHE official determines that modifications to the storm water control measures are necessary to meet the non-numeric effluent limits of the permit;  Facility staff find, during the course of an informal facility inspection or comprehensive site inspection, that the storm water control measures are not being properly operated or maintained. If any of the above conditions occur, then these conditions must be documented within 24 hours of discovery. Additionally, within 14 days of such discovery, GCC Energy must document any corrective actions conducted to eliminate or further investigate the issue. If no corrective action is taken, then a rationale as to why no action was implemented is required. A Corrective Action Report must be documented within 24 hours of the discovery, which corresponds to question 3 through 5 and Section C of the Annual Reporting Form (Annual Reporting Form located in Appendix B). The following items need to be documented:  Identification of the condition triggering the need for corrective action review  Description of the problem identified  Date the problem was identified Within 14 days of the discovery of deficient conditions, the following information must be documented:  Summary of corrective action taken or to be taken  Notice of whether SWMP modifications are required as a result of the discovery or corrective action  Date corrective action initiated  Date corrective action completed or expected to be completed.