Laserfiche WebLink
Th <br />n <br />ca II <br />r <br />ci <br />it <br />n <br />e <br />S <br />ti d 14 <br />28 i <br />h thi hi <br /> p <br />p <br />gag <br />e <br />e <br />e <br />e <br />a <br />o measure <br />. <br />nc <br />es s year. T <br />s <br /> value is 4.07 inches (23°s) below the 1981-2007 average. Snowpack runoff, <br /> estimated using the Seneca II precipitation gage, was 5.46 inches <br /> (November-March total), which is 1.82 inches (25s) bel ow the Seneca II <br /> 1981-2007 average. These values are more relevant than the Hayden <br /> Station data when evaluating the spring runoff observed this year at <br /> Seneca II. <br />Ground Water <br />Water Levels. Table 3 provides a summary of ground water monitoring <br />sites at the Yoast Mine. Water level data are provided in Appendix B. <br />Water level reports for the past six years are presented immediately <br />after the water level hydrograph of all data since 1991. Water level <br />measurements are collected with an electrical water level indicator or a <br />steel tape. Pressure readings (in psi) obtained from flowing wells with <br />pressure gages are multiplied by 2.31 to obtain head in feet. The <br />current ground water monitoring program is presented in Table 15-8 of <br />the Yoast Mine PAP. <br />Ground Water Level Summary. This year, water levels at all wells fell <br />within their historic ranges, with the following exceptions. Wadge <br />overburden well YOV30 has experienced a general decline in water levels <br />since it was first monitored in 1991. Water levels at Wadge coal well <br />YW30 are the lowest on record. <br />All alluvial wells are showing distinct seasonal water level <br />fluctuations in response to periods of precipitation recharge or the <br />lack of precipitation. Overburden and coal well water levels are <br />fluctuating in response to the precipitation recharge, induced ground <br />water flow to the reclaimed mine pits. Wells YOV29, YOV9 and YW7 were <br />dry. <br />Ground Water Quality. Table 4 shows the ground water parameter list <br />used for all well water samples. Appendix C provides all ground water <br />3 <br />it <br />