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6.4.7 Exhibit G -Water Information <br /> (1) The operation will affect groundwater systems through evaporation and <br /> pumping. Predicted depletions to groundwater which are tributary to the Big <br /> Thompson River are mitigated implementation of a Temporary Substitute <br /> Water Supply Plan (SWSP). The site has a current well permit and SWSP. <br /> Hydrologic Balance <br /> Ponds 1& 2 are being backfilled to prevent exposure of groundwater to the <br /> atmosphere. A long term augmentation plan has been applied for with water <br /> court (19CW3157) to augment the remaining ponds on the site, with the <br /> exception of Ponds located in the South West portion of the site. These SW <br /> Ponds were historical mining sites which exposed approximately 5 acres of pond <br /> area prior to 1980. Currently approximately 2.8 acres of surface pond area <br /> occurs and will remain as such. <br /> With regard to floodwater hydrologic balance, a Letter of Map revision will be filed <br /> with Larimer County Engineering pending approval of this amendment. Overall, <br /> the earthwork proposed in this reclamation plan will not affect floodwater surface <br /> elevations due to the fact that pond areas are modeled as ineffective flow up to <br /> their spill elevations. The final backfill grade for Ponds 1 & 2 will be at or just <br /> below that elevation. <br /> Kirtright Pit(M1986-123) Amendment Application <br /> Specific Exhibits <br /> Page 11 of 26 <br />