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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 <br />with this decision. Permit COG - 850038 was later reinstated with an expiration date of June 30, 1997. CEC <br />again proposed, and CDPHE approved, the expiration of the CDPS permit without renewal (the CDPHE letter <br />regarding 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 <br />exemption of certain small disturbed areas; (topsand storage and reference area sites) from the requirement to <br />have runoff from the small areas report to sediment ponds. This is because of the limited size of the areas, and <br />that ponds and treatment facilities are not necessary for drainage to meet the effluent limitations of Rule <br />420.5.and applicable State and Federal water quality standards for receiving streams. Mixing of the surface <br />drainage from these areas with a discharge from underground workings will not occur. Areas to be exempted are <br />described in the Index 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 -1 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 />5. Please direct DRMS to the section of the permit treating this topic or prepare <br />revised pages to the reclamation plan detailing this information. <br />Rule: 4.05.201 Exemptions <br />