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I• <br />average. ~Snowpack runoff, as estimated by totaling November through <br />April precipitation values, was 8,40 inches, which was 0.01 inches <br />(0.18) below the 1961-1990 average. <br />The Seneca II precipitation gage measured~14.98 inches this year. This <br />value is 4.11 inches (228) 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 (228) less than the <br />Seneca II 1981-2001 average. These values are more consistent than the <br />Hayden Station data when evaluating the spring runoff observed this year . <br />at Seneca II. <br />Ground Water <br />Water Levels. Water level data are presented in Appendix B. Water <br />level reports for data collected since 1997 are presented immediately <br />aater the water level hydrograph of all historic data for each <br />respective well. By presenting all historic data, trends related to <br />seasonal and annual variability and possible mining related impacts are <br />more clearly evident. Table 3 (Summary of Ground Water Monitoring <br />Wells) is presented as a reference for the reader. No wells were <br />drilled or abandoned this year. The ground water monitoring program in <br />presented on pages 7-341/342 of the Seneca II PAP. Water level <br />measurements obtained in non-flowing wells are taken with water level <br />indicator, or in the case of a few shallow alluvial wells, directly from <br />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 <br />the sake of brevity, ~ the prefix that precedes all well names will be <br />dropped throughout this report (except in the case of nested wells with <br />a similar number). As an example, Well SCAL46 will be referred to as <br />Well 46. <br />- Alluvium. The alluvial monitoring wells are located along Cow Camp <br />(Wells 46 and 69), Bond (Well 68), Grassy (Wells 33, 34, 70, and 71), <br />and Little Grassy Creeks (Wells 6, 31, 31A, and 32). These wells <br />exhibit seasonal fluctuations in water levels. The spring runoff- <br />3 <br />