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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 al., 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 I[ 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 date was obtained primarily et the Seneca II Mine Meteorological Station <br />using a Belfort Weighing Bucke[ Rain Gage. Precipitation data ere presented in Table 1 <br />(Appendix A). Total monthly precipitation data collected since 1981 are presented in <br />Table 2 (Appendix A). Vhere indicated, data from the U.S. Weather Service - Hayden Station <br />were used. Temperature, wind speed and direction data are presented in Appendix B. The • <br />temperature, wind speed, and direction monitoring equipment at the Seneca II Nine <br />Meteorological Station was relocated to the Seneca II-W Nine on August 15, 1991. This new <br />site is located approximately seven miles southwest of the Seneca II Mine. Climatic <br />conditions ere similar between the two mines. A Belfort Rain Gage is still located at the <br />Seneca II Mine. <br />Data from the National Climatic Data Center for the Hayden Station was used to evaluate <br />the. Long-term precipitation trend in the vicinity of the Seneca !I Mine. For Water Yeer <br />1992, 17.27 inches of precipitation was measured, which was 1.37 inches greater then the <br />1951-1980 average. This increase was primarily due to unusually large thunderstorms <br />during the late spring and summer. Snowpack runoff, as estimated by totaling November <br />through April precipitation values, was 8.08 inches, which was 0.20 inches below the <br />1951-1980 average. Snowpack runoff has been below the 1451-1980 average for the last six <br />years except for Water Year 1989 which was 0.59 inches above the average. <br />Ground Water <br />Water Levels. Pater levels gathered since January, 1981 are presented in Appendix C. • <br />2 <br />