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Sage Creek <br />SP monitors one NPDES site on Sage Creek, at the Pond 009 outfall. Flow and field <br />parameters are recorded monthly upstream, and monthly samples are taken for the <br />parameters listed in Appendix 15-1. In addition, SP monitors an NPDES site at the <br />Pond 015 outfall, located on a south tributary of Sage Creek. <br />SP has installed a sediment control system to divert, convey and/or treat surface <br />water runoff in and around the mine site. The sediment control system includes <br />seven sedimentation ponds (Ponds 005, 006, 009, 015, 016, 016A and 017). A more <br />complete discussion of this system is contained in Section III.C. of this document. <br />Flow and water quality measurements are taken at all sedimentation ponds, in <br />accordance with the Colorado Discharge Permit System permit issued by the <br />Colorado Department of Public Health and Environment, Water Quality Control <br />Division. <br />The permit application contains provisions for ongoing surface water monitoring. <br />The water monitoring plan is detailed in Tab 15. <br />SP has included a plan for an alternative water supply in the event that local water <br />rights are adversely impacted by mining. The plan is included in Tab 16 of the <br />permit. <br />G. Probable Hydrologic Consequences <br />A determination of the probable hydrologic consequences of the mining and <br />reclamation activities at the Seneca II -W Mine site has been made by the applicant <br />and is found in Tab 17 of the permit application. Pages 1-85 of Tab 17 narrative <br />focus on hydrologic impacts of mining within the original permit area. Pages 86- <br />143 address impacts of mining within the south extension area. This section includes <br />an evaluation of quantity and quality effects on ground and surface water systems <br />and mitigative measures to be taken both during and after mining. <br />The Probable Hydrologic Consequences section of this document is divided into two <br />subsections (Ground Water Effects and Surface Water Effects). The ground water <br />effects section has been updated by inclusion of a II -W South Extension addendum. <br />The surface water effects section has been updated to incorporate the effects of <br />Wadge and Wolf Creek/Sage Creek mining in the south extension area. <br />Ground Water Effects (Original Permit Area) <br />Probable hydrologic consequences to the ground water regime will be minor. <br />Localized effects to the hydrologic system will include: <br />19 <br />