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r = rate of conductivity increase per C, assume 0.02 (i.e., 2 percent) for <br />most dilute solutions <br />This formula is from "Standard Methods for the Examination of Water and Wastewater" <br />American Public Health Association, et at., 1985, pg. 79. This formula differs from that <br />given in past AHR's and should be used for the temperature correction of all field <br />conductivities for the Seneca l] Mine collected prior to October 1, 1989. Field <br />conductivities measured after March 7, 1990 were from an Extech Model 650 conductivity <br />meter which automatically compensates conductivity values to 25°C. <br />Meteorological Data <br />Precipitation data was obtained primarily at the Seneca II Mine Meteorological Station <br />using a Belfort Weighing Bucket Rain Gage. Where indicated, data from the U.S. Weather <br />Service - Hayden Station were used. Precipitation data are presented in Table 1 (Appendix <br />A). Total monthly precipitation data collected since 1981 are presented in Table 2 <br />(Appendix A). Temperature, wind speed and direction data are presented in Appendix B. <br />The temperature, wind speed, and direction monitoring equipment at the Seneca [I Mine <br />Meteorological Station was relocated to the Seneca II-W Mine on August 15, 1991. This new <br />site is Located approximately seven miles southwest of the Seneca II Mine. Climatic <br />conditions are similar between the two mines. A Belfort Rain Gage is still located at the <br />Seneca II Mine. <br />Noteworthy of mention 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 9.01 inches (eater equivalent), <br />which is below the 1981-1991 average of 9.95 inches. This resulted in slightly below <br />normal spring runoff. Below normal snowpacks have been observed since 1987. <br />Ground Water <br />Water Levels. Water levels gathered since January, 1981 are presented in Appendix C. <br />Water level re po ris for each cell are presented immediately after the water level <br />hydrograph for each respective cell in the same appendix. By presenting eleven years <br />worth of data, trends related to seasonal and annual variability and possible mining <br /> <br />related impacts are more clearly evident. Table 3 (Summary of Ground Water Monitoring <br />2 <br />