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r =rate of conductivity increase per °C, assume 0.02 (i.e., 2 percent) for most • <br />dilute solutions <br />This formula is from "Standard Methods for the Examination of water and Wastewater", <br />American Public Heelth Association, et al., 1985, Pg. 79. This formula differs from that <br />given in pest AMR's and should be used for the temperature correction of ell field <br />conductivities for the Seneca 11-w 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 Deta <br />Precipitation data et the Seneca II-w Nine has been collected since August 28, 1989. <br />Precipitation date is collected from a Belfort weighing Bucket Rain Gage situated adjacent <br />to Site Sw-S2w-FG1. Data for the 1992 Yater Year may be fiound in Table 1 (Appendix A). <br />To provide a basis for comparison of past years precipitation data, data from PNCC's <br />adjacent Seneca II Mine has been included in Table 2 (Appendix A). The Seneca II Mine <br />precipitation station is located approximately seven miles northeast of the center of the • <br />Seneca II-w Mine. Climatic conditions are similar between the two mines. Temperature, <br />wind speed, and direction data from the Seneca 11-w Mine are presented in Appendix B. <br />Data from the National Climatic Data tenter for the Hayden Station was used to evaluate <br />the precipitation trend. For Water Tear 1992, 17.27 inches of precipitation was measured, <br />which was 7.37 inches greeter then the 7951-1980 average. This increase was primarily due <br />to unusually large thunderstorms during the late spring and summer. Snowpeck runoff, as <br />estimated by totalling November through April precipitation values, was 8.08 inches, which <br />was 0.20 inches below the 1951-1980 average. Snowpack runoff has been below the 1957-1980 <br />average for the last six years (except for Water Year 7989, which was 0.59 inches above <br />the average). <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 wells, water levels gathered si nce 1980 are presented. <br />In [his appendix, when a well is dry, the total depth of the well is given in the "Depth • <br />to water" column. this is to aid in the statistical evaluation of water level data. <br />2 <br />