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conductivities measured after March 7, 1990 were from an Ex[ech Model 650 Conductivity • <br />Meter which automatically Compensates conductivity values to 25° C. <br />Meteorological Data <br />Precipitation data at the Seneca II-w Mine has been collected since August 28, 1989. <br />Precipitation data is collected from a Belfort Weighing Bucket Rain Gage situated adjacent <br />to Site SW-52w-FG1. Data for the 1991 water year may be found in Table 1 (Appendix A). <br />io provide a basis for comparison of past years precipitation data, data from PCC's <br />adjacent Seneca 11 Mine has been included in Table 2 (Appendix A). The Seneca II Mine <br />weather station is located approximately seven miles northeast of the center of the Seneca <br />II-W Mine. Climatic conditions are similar between the two mines. Temperature, wind <br />speed, and direction data from the Seneca II and Seneca II-W Mines are presented in <br />Appendix B. The equipment at the Seneca 11 weather station was relocated to Seneca l]-W <br />on August 15, 1991. The new location is shown on Exhibit 7-1, Hydrology Monitoring Map. <br />Noteworthy of mentign is the near average precipitation measured this year (since 1987, <br />precipitation has been below average). However, the snowpack (as estimated by totaling <br />November through April precipitation) for this year was 9~1 inc Fes (water equivalent), <br />which is below the 1981-1991 average of 9.95 inches. This resulted in slightly betou <br />normal spring snowmelt runoff. Below normal snowpacks have been observed since 1987. <br />Ground water <br />Water levels. Water levels for all wells that are in the current monitoring program are <br />presented in Appendix C. For these cells, water levels gathered since 1980 ere presented. <br />In this appendix, when a cell is dry, the total depth of the well is given in the "Depth <br />to water" column. This is to aid in the statistical evaluaCion of water level data. <br />Hydro9raphs for each well are presented prior to the water level report for each <br />respective well in the same appendix. By presenting up to twelve years worth of date, <br />trends related to seasonal and annual variability are mare clearly evident. Water level <br />measurements are taken with a Soil Test M-scope, or a Slope Indicator Water Level <br />Indicator, or in [he case of a few shallow alluvial wells, directly from a steel tape. <br />Table 3 (Appendix A), Summary of Ground Water Monitoring cells, is included as a reference <br />for the reader. • <br />2 <br />