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<br />• <br />• <br />Introduction <br />The information assembled in this 2010 Annual Hydrology Report (AHR) <br />includes data collected from all water monitoring sites at Hayden Gulch <br />Terminal (HGT) Inc.'s Hayden Gulch Loadout (State Permit No. C-92-081) <br />for the calendar year 2010. Locations of water monitoring sites can be <br />found in Figure 1 (Appendix A). <br />Meteoroloqical Data <br />No meteorological data is collected at the Loadout. However, Peabody <br />Energy does collect meteorological data at its nearby Sage Creek and <br />Seneca II-W Mines. The reader is referred to those AHR's for that data. <br />Data from the National Climatic Data Center's Hayden Station is used <br />here to evaluate the precipitation trend. These data are provided in <br />Appendix B of the Seneca II-W AHR. For this year, 17.85 inches of <br />precipitation was measured, which is 0.51 inches (3%) above the 1971- <br />2000 average, 17.34 inches. The months of December, March, April, May, <br />June and August were above average. <br />Water Sampling and Measurement Techniques <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 list <br />used for all wells. Analyses are performed by ACZ Laboratory in <br />Steamboat Springs, Colorado. ACZ Laboratory performs all analyses by EPA <br />or equivalent methods. Samples are delivered the day of collection to <br />the lab in an iced cooler. <br />1