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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 tliffers from that <br />given in past AHR's and should be used for the temperature correction of all field <br />conductivities for the Seneca II 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 />Noteworthy of mention are the low precipitation amounts recorded the past four years, with . <br />the 1990 total being the lowest (14.79 inches) for the past four years. <br />Ground Water <br />Water Levels. Water levels gathered since January, 1981 are presented in Appendix C. <br />Water level reports for each well are presented immediately after the eater level <br />hydrograph for each respective well in the same appendix. By presenting ten years north <br />of data, trends related to seasonal and annual variability and possible mining related <br />impacts are more Clearly evident. Table 3 (Summary of Ground Water Monitoring Wells, <br />Appendix A>, is presented as a reference for the reader. No new wells were drilled in <br />1990. Water level measurements obtained in non-flowing cells are taken ui th either a Soi( <br />Test M-scope, a Slope lndicator Water Level Indicator, or in the case of a few shallow <br />alluvial wells, directly from a steel tape. Pressure readings (in psi) obtained in <br />flowing cells are multiplied by 2.31 to obtain head in feet. <br />For the sake of brevity, the GW-S prefix that precedes ell well names will be dropped <br />through out this report. As an example, Well GW•S46-A will be referred to as Well 46-A. • <br />2 <br />