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Both Sites 109 and 115 discharging - Flow and electrical conductivity measurements will <br />be obtained at Sites 69, 1005, 109 and 115, and the data will be entered into the Mine <br />Discharge Calculator to determine maximum discharge rates from Sites 109 and 115. The <br />result may be that TCC can only discharge from one, both, or neither of the sites. The <br />calculator will be used to determine those rates and the above described monitoring will <br />verify the accuracy of the calculator. <br />Monitoring for the 1,500 pmhos /cm Fish Creek Material Damage Standard - The "Contingent" monitoring in <br />Table A also includes monitoring aimed at preventing exceedances of the 1,500 µmhos /cm material damage <br />standard forFish Creek. For this purpose, weekly data from Site 16A and weekly EC data from Site 115 will be <br />entered in the "Fish Creek Calculator" (see Table E49 -25). The Fish Creek Calculator is used to determine the <br />maximum discharge rate for Site 115 that would not cause material damage to the downstream Fish Creek AVE <br />During the winter months, when Site 16A is iced over, flow data from USGS station 09239500 will be used to <br />estimate the flow at Site 16A, and this value will be used in the "Fish Creek Calculator ". The EC and sulfate data <br />will be forwarded to the Division on a quarterly basis for the period of I` quarter, 2000 through 4th quarter 2001. <br />The data will be submitted within 45 days of the end of the respective quarter. <br />Estimating Wintertime Surface Flows from Correlations with Yampa River USGS Site - During the winter, when <br />ice conditions prevent accurate measurement of surface water flow rates at monitoring sites, they will be estimated <br />using a relationship with the USGS station on the Yampa River below Steamboat Springs (09239500). This data is <br />available on an instantaneous basis year -round on the Internet (http//nwis- colo.cr.usgs.gov /rt- <br />cgi /gen_st _pg ?station= 09239500). Since there is insufficient data from Site 1005 to develop a relationship, a <br />relationship with Site 1003 (Fish Creek above Trout Creek) was developed. This flow is added to the flow from <br />Sites 69 and 115. The resulting linear regression relationships and equations are presented below. <br />F1ow16A = (1.008363 * Flowyampa) + (- 3.871291- (2 * (0.4608940))) <br />Flow69 = (0.7042560 * F1owYa,npa) + (- 0.8616838- (2 * (0.2356389))) <br />FlOW1003 = (1.002034 * F1owYa,npa) + (- 3.406873- (2 * (0.4574477))) <br />FlOW1005 = Flow,003 + Flow69+ FlOW115 <br />Mine Inflow Monitoring <br />Mine inflow monitoring will be performed on an annual basis, typically in the spring. The survey will consist of <br />on -site measurement of water inflows where they occur in the mine, using bucket and stopwatch, portable flumes, <br />or estimates of flow in areas where direct measurement is not possible. The source of the inflow such as faults, <br />fractures, abandoned drillholes, etc., will be identified. Field measurements of temperature, pH and specific <br />conductance will be selectively performed. The data will be plotted on a map of the mine workings and submitted <br />in the annual hydrologic report. <br />RN 12 -06 Exhibit 14 - 4 04/01/13 <br />