2012-06-19_REPORT - C1992081 - Laserfiche WebLink

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Introduction The information assembled in this 2011 Annual Hydrology Report (AHR) includes data collected from all water monitoring sites at Hayden Gulch Terminal (HGT) Inc.'s Hayden Gulch Loadout (State Permit No. C -92 -081) for the calendar year 2011. Locations of water monitoring sites can be found in Figure 1 (Appendix A). In 2011, the tipple was scrapped. Topsoiling and reseeding of the tipple area was also completed in 2011. The office area and the rail line were left in place. Meteorological Data No meteorological data is collected at the Loadout. Data from the National Climatic Data Center's Hayden Station is used here to evaluate the precipitation trend. These data are provided in Appendix Al of the previously submitted Seneca II AHR. For this year, 25.79 inches of precipitation was measured, which is 8.45 inches (49 %) above the 1971- 2000 average, 17.34 inches. All months except January, June, August and September were above average. Snowpack runoff, as estimated by totaling November through April precipitation values, was 15.59 inches, which was 6.84 inches (78o) above the 19712000 average, 8.75 inches. Water Sampling and Measurement Techniques Field conductivity and pH meters were calibrated prior to each days use. The conductivity meter is calibrated using a potassium chloride solution with an electrical conductivity in the 1,000 to 4,000 umhos /cm range. The pH meter is calibrated using NBS traceable buffers with pH values of 7 and 10. Water level: measurements are taken with a water level indicator, or directly from a steel tape. Table 1 (Appendix A) shows the surface water parameter list used for all stream sites. Table 2 (Appendix A) shows the ground water parameter list used for all wells. Analyses are performed by ACZ Laboratory in Steamboat Springs, Colorado. ACZ Laboratory performs all analyses by EPA 1