Laserfiche WebLink
n <br />U <br />Approved Hydrological Monitoring Plan <br />for tfie <br />New Horizon Mine 2 <br />X-Z'.'°.'~„~.':.W.C. :. ..::_:::Rn:"..:.i4 ....: .:~.`XGr"":3in.... -....::::i."'::. .. w:.„#.:'y{~p~LL.:..]#la rA..v.LkRAi'~PGXL~W <br />Introduction and Summary <br />The purpose of this repon is twofold. First, the repon presents a review of the existing <br />hydrological monitoring data of the Yucla East mine site, now ltnown as [he Vew Horizon <br />Mina ?and presents an update of the environmental tronsegvences for the new mine plan. <br />Second, the repon recommends a revision of the hydrological monitorne program to better <br />lit the new mine plans which have been developed. Information reviewed includes surface <br />and groundwater da[a collected during the periotl of record (July 1986 to February 1990). <br />Rewmmendations are made regarding the lopdon of 'surface water stations and <br />groundwater wells in the area to potentially be effected by mining. Dam collections are also <br />recommended for each of the sampling stations. These intrude monitoring requirements of <br />the water augmenration plan required by the Colorado Co-operative Company. <br />Existing Data Review <br />• The data summarized in this report was collected from approved moniroring sites in <br />accordance with Permit iYo. C-31-008. The daw encompass the period oti July 1986 through <br />February I990. In February 1990, the permit was revised to eliminate hydrologic monitoring <br />during temporary cessation of operariotts at the vuda Fast Mine site. Since the mine plan <br />currently proposed by Western Fueh hss changed from that originaAy proposed by Peabody, <br />several of the monitoring smtiaas are proposed to be eliminated or relocated to more <br />appropriately monitor the potential effects of mining on the hydrologic balance. ?s a result, <br />only those mmitoring points which are proposed to remain in the program will be <br />considered in this evaluation. <br />Surface Water Monitoring <br />These are seven surface water monitoring smdoas located within the Vew Horizon Mine 2 <br />watershed, sire SW-NIlOI through SW-Y107. Table 1 describes dte rotations and [he type <br />of Dow measurement performed at each of the sites (also see Map ?04.7-1). Surface water <br />'flow data collected from sites SW-Y141, SW-X1102, SW-`i104; and SW-i`I1O5 aze contained <br />in Appendix ~. Minimums and ma;dmums for tack station aze shown in Table 2 for the <br />irrigation season and non-irrigation season. For stations SW-V101 located on Calamity <br />Draw, t7ow varied from 0.4 efs to ? 0 cfs during the non-irrigazion season and i.a efs ro 1.i.4 <br />cfs during the irrieadon season. For station SW-103 (opted on the tributary of Calamity <br />Draw which passes through the area to be mined. flow varied from 0.0 to 0.6 cfs during the <br />J <br />Attachment 2.04.7-5-4 <br />