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4. Or, demonstrate to DRMS that the data and values presented in Appendix K-1 of <br />the permit remain valid in 2016 and through 2026. <br />Rule 4.05.1 <br />This is a review of Rule: 4.05.1(1 -4); Conducting activities to minimize and prevent disturbance to the <br />prevailing hydrologic balance. <br />Appendix K, Surface Water/Sediment Control (2001) discusses measures taken to protect the hydrologic balance <br />through treatment facilities. <br />This section of the rules is adequately addressed in the permit. However, please consider carefully bulleted <br />points above for Rules 2.05.3 and 4.05.1. <br />Rule 4.05.2 Water Oualitv Standards and Effluent Limitations <br />This is a review of Rule: 4.05.2(1 and 2); surface drainage from the disturbed area and of water discharged from <br />underground workings to surface waters. <br />Review of Permit Renewal 6 (RN6) Findings document states that CEC has established drainage systems, <br />including sediment ponds, to meet the applicable State and Federal water quality requirements for downstream <br />receiving waters. These rules include those of the Colorado Department of Public Health and Environment <br />(CDPHE). <br />There is currently no surface water monitoring at the Keenesburg Mine Site, because there is no point of surface <br />water discharge. On December 18, 1989, Technical Revision 23 approved the deactivation of the Colorado <br />Discharge Permit System (CDPS) permit, and the Department of Health (former name of CDPHE) concurred with <br />this decision. Permit COG - 850038 was later reinstated with an expiration date of June 30, 1997. CEC again <br />proposed, and CDPHE approved, the expiration of the CDPS permit without renewal (the CDPHE letter regarding <br />the Request for Inactivation of this permit can be found in Division files). <br />The requirements of Rule 4.04.2(1 and 2) are adequately addressed. <br />This is a review of Rule: 4.05.2(3). <br />As per Findings RN6 document dated September 2011, the Division proposes to continue the approved exemption <br />of certain small disturbed areas; (topsand storage and reference area sites) from the requirement to have runoff <br />from the small areas report to sediment ponds. This is because of the limited size of the areas, and that ponds and <br />treatment facilities are not necessary for drainage to meet the effluent limitations of Rule 420.5.and applicable <br />State and Federal water quality standards for receiving streams. Mixing of the surface drainage from these areas <br />with a discharge from underground workings will not occur. Areas to be exempted are described in the Index <br />Maps and Legal Description sections of the Permit [Rule 4.05.2(3)]. <br />The requirements of Rule 4.04.2(3) is adequately addressed. <br />Rule: 4.05.2(1.2) Sediment Pond Maintenance and Removal <br />This is a review of the rules relating to sediment ponds and other treatment facilities with respect to maintenance <br />and removal. <br />Appendix Q -I comprises the final Reclamation Plan Map dated July of 2009. <br />This section of the rules is adequately addressed in the permit with the exception of: <br />♦ DRMS found no mention in the permit regarding maintenance of permanent sediment ponds, <br />(Pond 2 and the Dugout Pond) and the permanent West Perimeter Ditch. <br />Keensburg Permit Renewal RN7 Prepared by: R. Reilley <br />Date: May 2016 Document Location: M\\Coal\rar\MidTerm Reviews <br />