Laserfiche WebLink
Peak Ranch Resource <br /> August 5, 2020 <br /> groundwater lake. This will ensure that the reclamation condition of the site does not negatively affect the <br /> prevailing hydrologic balance of the alluvial aquifer groundwater. <br /> Quarterly quality monitoring of the groundwater will continue until reclamation release has been achieved. <br /> Groundwater monitoring well number one (GW-1)will be used throughout the operation of the Peak Ranch <br /> Resource as a compliance monitoring point, as it is downstream of the operation. Upon reclamation, GW-1 <br /> sampling will be compared to the baseline data Peak Materials has gathered as well as the standard water <br /> quality limits for drinking water as part of liability release determination. <br /> 9.0 WATER CONSUMPTION AND SOURCES FOR THE OPERATION <br /> The necessary physical water supplies for mining and reclamation operations will be secured pursuant to <br /> water leases; trucking water to the site from approved sources, if needed; and use of the decreed irrigation <br /> water rights already associated with the site. These supplies will be utilized pursuant to SWSPs approved by <br /> the Division of Water Resources, and, for Phase 2 and thereafter, a permanent augmentation plan approved <br /> by the Water Court. Groundwater wells in the area will not be injured, since no dewatering of the groundwater <br /> table via pumping will occur at any time. No Phase 1 mining will take place prior to the approval of a SWSP <br /> that covers depletions associated with dust control,which is the only on-site water demand anticipated during <br /> Phase 1 (other than continued use of the decreed irrigation water rights for irrigation purposes only), with <br /> releases of leased replacement supplies from upstream storage. <br /> No processing or washing of product will occur on site. No concrete manufacturing or asphalt manufacturing <br /> will occur on site.As such, the only water uses on the site will be for dust control,temporary irrigation of <br /> grasses and trees on berms, evaporative losses from the saturated material excavated during Phase 2, and <br /> evaporative losses from an on-site lined augmentation pond and from the groundwater lake that will be <br /> created during Phase 2. The water resource demands for Phase 1 (Table G-1, below) and Phase 2 (Table G- <br /> 2, below) are calculated based upon a production rate of 400,000 tons/year. It is anticipated that the water <br /> demand for Phase 1 will be 2.08 ac-ft per year plus any evaporation loss occurring from water stored in the <br /> lined on-site augmentation pond for subsequent release. Phase 2 will scale up from Phase 1 consumption as <br /> more groundwater is exposed by mining,with the peak final water depletions for Phase 2 anticipated to be <br /> 159.86 ac-ft per year plus any evaporation loss occurring from water stored in the augmentation pond. <br /> Peak Materials will lease replacement water supplied for dust control and evaporation occurring from the <br /> surface of the on-site augmentation pond (Phases 1 and 2),to account for evaporation from exposed <br /> groundwater(Phase 2), and depletions occurring as material is dried out during the operation (Phase 2). <br /> Operational water will be diverted from the Blue River by means of a pumpset,which consists of a diesel <br /> generator and a surface water pump(see Map C-2A for location).The pumpset will be located at the currently <br /> decreed point of diversion for the decreed Hawk Hill Pump and Pipeline irrigation water right on the site. <br /> Prior to commencement of Phase 2 mining activities, Peak Materials will acquire any necessary, additional <br /> legal water supplies required to permanently replace all evaporative depletions from the groundwater lake <br /> pursuant to an augmentation plan to be approved and decreed by Colorado Water Court. No groundwater will <br /> be exposed until such supplies are secured for Phase 2, and enough proof of such water supplies is <br /> demonstrated to and accepted by the DRMS via a technical revision. <br /> The proposed augmentation pond for both Phase 1 and Phase 2 as well as the augmentation pond that will be <br /> required following reclamation are shown on Exhibits C and F on the north side of the site in the Phase 1 <br /> mining area. <br /> r,rcg lxwicn and Ax ivca,eLu', G-4 <br />