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Introduction <br />The information assembled in this 2007 Annual Hydrology Report (AHR) <br />includes data collected from all water monitoring sites at Peabody <br />Energy's Hayden Gulch Terminal (HGT, State Permit No. C-92-081) for the <br />calendar year 2007. Locations of water monitoring sites can be found in <br />Figure 1 (Appendix A). <br />Meteorological Data <br />No meteorological data is collected at the HGT. However, Seneca Coal <br />Company (SCC) does collect meteorological data at its Seneca II and <br />Seneca II-W Mines. The reader is referred to those AHR's for that data. <br />Snowmelt runoff this year was below average and occurred earlier than <br />usual. Total precipitation for the 2007 water year was 7% above average, <br />as measured at NOAA's Hayden Station. <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 <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