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i• <br />The Seneca II precipitation gage measured 14.96 inches this year. This <br />value is 9.11 inches (22$) less than the 1981-2001 average. Snowpack <br />runoff, estimated using the Seneca II precipitation gage, was 7.48 <br />inches (November-April total), which is 2.13 inches (22~) less than the <br />Seneca II 1981-2001 average. This is the fourth year in a row of below <br />average precipitation at Seneca II. These values are more consistent <br />than the Hayden Station data when evaluating the spring runoff observed <br />this year at Yoast. <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 five 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 />- Alluvium. One well, YAAL14, monitors the Annand Draw alluvium. Two <br />wells, YGAL15 and 16, monitor the Grassy Creek alluvium. Nine wells; <br />YSAL1 to 6, 8, 10 and 12; monitor the Sage Creek alluvium. Most well <br />water levels exhibit the typical seasonal fluctuation, increasing water <br />levels in the spring followed by decreasing water levels in the summer <br />and fall. Most wells exhibited water levels this year within their <br />historic ranges. Beaver dams may affect water levels in the alluvium. <br />Well YSAL12 exhibited a water level in May 2001 higher than ever <br />observed before. <br />- Wadge Overburden. Five wells; YOV9, 19, 28, 29 and 30; monitor the <br />Wadge overburden. Monitoring at Well YOV15 was discontinued in July <br />2001 (see Introduction). Well YOV28 exists in the Armand Draw basin, <br />all others exist in the Sage Creek basin. Most wells exhibit typical <br />3 <br />