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<br />Proposed Hydrological Monitoring Plan <br />for the <br />New Horizon Mine 2 <br />Introduction and Summary <br />The purpose of this report is twofold. First, the report presents a review of the e~dsting <br />hydrological monitoring data of the Nucla Fast mme site, now known as the New Horizon <br />Mine 2 and presents an update of the environmental consequences for the new mine plan. <br />Second, the report recommends a revision of the hydrological monitoring program m better <br />fit the new mint plans which have been developed. Information reviewed includes surface <br />and groundwater data collected during the period of recerd (July 1986 to February 1990). <br />Recommendations are made regarding the location of surface water stations and <br />groundwater wells in the area to potentially be effected by mining. Data collections are also <br />recommended for each of the sampling stations. These include monitoring requirements of <br />the water augmentation plan required by the Colorado Co-operative Company. <br />Existing Data Review <br />• The data summarized in this report was collected from approved monitoring sites in <br />accordance with Permit No. C-81-008. The data encompass the period of July 1986 through <br />February 1990. In February 1990, the permit was revised to eliminate hydrologic monitoring <br />during temporary cessation of operations at the Nuda East Mine site. Since the mine plan <br />currently proposed by Western Fuels has changed from that originally proposed by Peabody, <br />several of the monitoring stations are proposed to be eliminated or relocated to more <br />appropriately monitor the potential effects of mining oa the hydrologic balance. As a result, <br />only those monitoring points which are proposed to remain in the program will be <br />considered in this evaluation. <br />Surface Water Monitoring <br />There are seven surface water monitoring stations located within the New Horizon Mine 2 <br />watershed, site SW-N101 through SW-N107. Table 1 desmbes the locations and the type <br />of flow measurement performed at each of the sites (also see Map 204.7-i} Surface water. _ .,. _ <br />flow dais collected from sites SW-N101, SW N102, SW-N104, and SW-N105 are contained <br />in Appendix A. Minimums and ma~dmums for each station aze shown in Table Z for the <br />irrigation season and non-irrigation season For stations SW-N101 located on Calamity <br />Draw, flow varied from 0.4 cfs to 2.0 cfs during the non-irrigation season and 4.2 cfs to 13.4 <br />cfs during the irrigation season For station SW-N1021ocated on the tributary of Calamity <br />Draw which passes through the area to be mined, flow varied from OA to 0.6 cfs during the <br />• <br />Attachment 2.04.7-5-23 <br />