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• <br />Introduction <br />The information assembled in this 2009 Annual Hydrology Report (AHR) <br />includes data collected from all water monitoring sites at Hayden Gulch <br />Terminal, Inc.'s Hayden Gulch Loadout (State Permit No. C-92-081) for <br />the calendar year 2009. Locations of water monitoring sites can be found <br />in Figure 1 (Appendix A). <br />Meteoroloqical Data <br />No meteorological data is collected at the Loadout. However, Seneca <br />Coal Company (SCC) does collect meteorological data at its nearby Seneca <br />II and Seneca II-W Mines. The reader is referred to those AHR's for <br />that data. Total precipitation for the 2009 water year was 20.03 <br />inches, 16% above average, as measured at NOAA's Hayden Station. <br />Snowmelt runoff this year was above average and occurred later than <br />usual. Snowpack (November-March precipitation) was 10.12 inches, 42% <br />above average, as measured at NOAA's Hayden Station. <br />Water Sampling and Measurement Techniques <br /> <br />Field conductivity and pH meters were calibrated prior to each days use. <br />The conductivity meter is calibrated using a potassium chloride solution <br />with an electrical conductivity in the 1,000 to 4,000 umhos/cm range. <br />The pH meter is calibrated using NBS traceable buffers with pH values of <br />7 and 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 all <br />stream sites. Table 2 (Appendix A) shows the ground water parameter <br />list used for all wells. Analyses are performed by ACZ Laboratory in <br />Steamboat Springs, Colorado. ACZ Laboratory performs all analyses by <br />EPA or equivalent methods. Samples are delivered the day of collection <br />to the lab in an iced cooler. <br />1