Laserfiche WebLink
approximately seven miles southwest of the Seneca II Mine. Climatic conditions are <br />similar between the two mines. <br />Data from the National Climatic Data Center for the Hayden Station was used to evaluate <br />the precipitation trend. For Water Tear 7993, 15.48 inches of precipitation was measured, <br />which was 0.42 inches less [hen the 1951-7980 average. This decrease was primarily due to <br />an unusually dry May through July. Snowpack runoff, es estimated by totaling November <br />through April precipitation values, was 9.49 inches, which was 1.21 inches above the <br />1951-1980 average. This is the largest snowpack since 1986. <br />Ground Water <br />Water Levels. Water levels gathered since January, 1981 are presented in Appendix C. <br />Water level reports for each well are presented immediately after the Water level <br />hydrogreph for each respective well in the same appendix. By presenting 13 years Worth of <br />data, trends related to seasonal and annual variability end possible mining related <br />impacts are more clearly evident. Table 3 (Summary of Ground Water Monitoring Yells) <br />is presented as a reference for the reader. No new wells were drilled in 1993. Water <br />level measurements obtained in non-flowing wells are taken with either a Soil Test <br />M-scope, a Slope Indicator Water Level Indicator, or in the case of a few shallow alluvial <br />wells, directly from a steel tape. Pressure readings (in psi) obtained from flowing wells <br />with pressure gages are multiplied by 2.31 to obtain head in feet. For the sake of <br />brevity, the GW-S prefix that precedes ell well names will be dropped throughout this <br />report. As an example, Vell GW-S46-A will be referred to as WeLI 46-A. <br />Alluvium. The alluvial monitoring wells are located along Cow Camp (Wells 46•A and 69-A), <br />Bond (Well 68-A ), Grassy (Wells 33-A and 34-A), and Little Grassy Creeks (Wells 6-A, <br />31-A1, 31-A2, and 32-A). These wells exhibit seasonal fluctuations in water levels. The <br />spring runoff-infiltration stimulates a water level rise, and as the drier fall season <br />approaches, water levels decline. Generally, spring season water Levels were shallower <br />this year due to an increase in snowpack runoff from previous years. <br />Lennox Overburden/Lennox-Wadge Interburden. The four wells completed in these formations <br />exhibit normal seasonal variations, that is, lowest water levels in the fall and winter, <br />and highest in the late spring/early summer after the spring runoff recharge event. In <br />1993, three of these wells (21-LWI, 41-LWI, end 42P1-LWI) displayed their highest water <br />2 <br />