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• <br />Introduction <br />The information assembled in this 1994 Annual Hydrology Report (AXR) includes date <br />collected from all water monitoring sites at Seneca Coel Company's (SCC) Hayden Gulch <br />Terminal (HGT, State Permit No. C-92-081) for the calendar year 1994. Previous ANRs <br />submitted were also compiled according to calendar years (as opposed to water years). <br />Locations of water monitoring sites can be found in Figure 1 (Appendix A). <br />Meteoroloaicel Date <br />No meteorological date is collected at the MGT. Xowever, SCC does collect meteorological <br />date et its Seneca II end Seneca II-Y Mines. The reader is referred to those ANRs for <br />that data. Noteworthy of mention for this year is the lower then average snowfall end <br />summer rainfall. <br />Water Semolina and Measurement Techniques <br />Field conductivity and pH ureters Were calibrated prior to each days use. The conductivity <br />• meter is calibrated using a potassium chloride solution With en electrical conductivity In <br />the 1,000 to 3,000 umhos/cm range. The pX meter is calibrated using NBS traceable buffers <br />With pX values of 7 end 10. Water level measurements are taken With a Water level <br />indicator or directly from a steel tape. <br />Table 1 (Appendix A) shows the surface Water parameter list used for ell stream sites. <br />Table 2 (Appendix A) shows the ground Water parameter list used for all wells. Analyses <br />ere performed by ACZ Laboratory in Steamboat Springs, Colorado. ACZ Laboratory performs <br />all analyses by EPA or equivalent methods. Samples ere delivered the day of collection to <br />the lab in an iced cooler. <br />Surface Water <br />There are two NPDES sites at xGT, 001 and 002. NPDES 002 did not flout in 1994. NPDES 001 <br />did not flout through its principal spillway in 1994. However, NPDES 001 Wes dewatered on <br />March 2, 1994 (after all snowmelt) to provide additional storage capacity for potential <br />rainfall events. An analysis of the sample collected on that date is provided in Appendix <br />• B, Yater Ouelity Reports. No NPDES effluent limits were exceeded. Discharge monitoring <br />reports ere provided in Appendix C. <br />1 <br />