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Neteorolociral Data • precipitation data was obtained primarily at the Seneca II Nine Meteorological station using a eelfost We1gDlnq Bucket Hain Gage. Duly precipitation data for 1995 are presented 1n Table i. Total monthly precipitation data collected since 1991 are presented in Table 2 (Appendix A). Whera indicated, data from the U. s. Weather Service - Bayden Station were used. Temperature, rind speed and direction data aze presented in Appendix B. The data in Appendix B Ss from the Seneca II-W Hine Meteorological 9tauon located approximately seven miles southwest of the Seneca II Hine. Climatic conditions are similar between the two mines. Data from the National Climatic Data Center for the Hayden station vas used to evaluate the precipitation trend. For Water Year 1995, 16.8< inches of precipitation was measured, which was 3.22 inches greater than the 1961-199D average. October, December through Mazch, Scaly, and August were all belov average. enovpa[.k runoff, as estimated by totaling November through April precipitation values, vas 9.28 inches, vhith vas 0.87 inUes above the 1961-1990 average. April precipitation, which vas 1.49 inches above average, accounted for much of this increase. Nay precipitation, which vas 2.71 inches above . average, also contributes! to a Digh spring runoff, The Seneca II precipstauon gage measured 21. D1 inches in Water Year 1995. This value is 1.98 inthes greater than the 1981-1995 average. Oresund Water Water Levels. Water level data are presented 1n Appendix C. Water level reports for data collected this year are presented imuediately after the vater level hydrograph of all historic data for each respective veil in the same appendix. Hy presenting all historic data, fronds related to seasonal and annual variability and possible mining related impacts are more clearly evident, Table 3 (Summary of 6zound Water Monitoring Wells) is presented as a zeferenm for the reader. No new veils were Qrilled in 1995. Water level measurements obtained in non-floving cells are taken vith either a Soil Test N- scope, a Slope Indicator Water Level Indicator, or in the ease of a fey shallow alluvial wells, directly from a steel tape, Pressure readings (in psi) obtained from flowing yells with pressure gages are multiplied by 2.31 to obtain head in feet. For the sake of • brevity, the prefix that precedes all veil names will be dropped throughout this report. 2