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Introduction <br />The information assembled in this 2013 Annual Hydrology Report (AHR) <br />includes data collected from all water monitoring sites at Hayden Gulch <br />Terminal, LLC (HGT) Hayden Gulch Loadout ( CDRMS Permit C -92 -081) for the <br />calendar year 2013. Locations of water monitoring sites can be found in <br />Figure 1 (Appendix A). <br />In 2011, the tipple was scrapped. Topsoiling and reseeding of the tipple <br />and coal storage areas were also completed in 2011. The office area and <br />the rail line were left in place. <br />The Tie - Across Haul Road (formerly associated with the Seneca II -W Mine, <br />CDRMS Permit C -82 -057) was transferred to the Hayden Gulch Terminal on <br />January 4, 2012. <br />Meteorological Data <br />No meteorological data is collected at the Loadout. Data from the <br />National Climatic Data Center's Hayden Station is used here to evaluate <br />the precipitation trend. These data are provided in Appendix Al of the <br />previously submitted Seneca II Mine 2013 AHR. For this year, 17.58 <br />inches of precipitation was measured, which is 0.95 inches (5 %) below <br />the 1981 -2010 average, 18.53 inches. All months except December, April, <br />August and September were below average. Snowpack runoff, as estimated <br />by totaling November through March precipitation values, was 6.71 <br />inches, which was 0.80 inches (11 %) below the 1981 -2010 average, 7.51 <br />inches. <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 />1 <br />