2010-12-13_HYDROLOGY - M1980047 (2)

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• Richard D. Piland & Associates Hydrology Monitoring Report 2008 Stream Flow Monitoring Data The 2008 Water Year Discharge reports and hydrographs of the five stream flow monitoring station are in Appendix A. There are three graphs for each station; one representing daily flow in cubic feet per second, one representing monthly acre feet totals and one of annual total discharge in acre feet. The total precipitation for the 2008 Water Year was below average for the period of record at the Colony Site. The winter snow pack was considerably above average, with most of the snow melting during the end of April. Spring moisture was below average. October and December 2007, January, and February 2008 were the only above average months. Total precipitation for the water year was 17.62 inches of moisture, with the average being 20.7. The 2008 Water Year total stream flow discharge was above average, probably due to late melting above average snow pack. The snowmelt runoff was later in April and May with stream flows staying above average all summer. Table 4 (with the graph titled Total Yearly Discharges) plots yearly stream flow runoff discharge in acre feet for each year from 1998 through 2008. The graph shows total runoff from 1984 to 2008 with the precip plotted against the second y-axis. • Table 5 lists the average monthly stream flow at each monitoring site for the period 1984 to 2008. The accompanying graph titled Average Monthly Discharge clearly shows peak discharges are usually during May. In 2008 stream discharge peaked during end of May from the snowmelt runoff. Stream flow water quality samples collected for each site are listed in Table 2. During the 2008 Water Year samples were collected at F1 3R Davis Gulch (549N) each quarter and Middle Fork @ Lab during the third and fourth quarters. Graphs were made of the water quality parameters which are marked in Table 3. These water quality graphs are in Appendix B. Parameters were not graphed when the analyte result were below the practical quantitation limit. Sampling sites were changed in 1993 to two sites, F1 3R Davis Gulch and Middle Fork @ Lab ( F1 R when MF@ Lab is dry). During 1997 the surface water quality parameters and chain of custody procedures were changed. Sampling parameters are outline in batteries for each type of sample collected (ie.-Site Stream, Site Well, or Site NPDES). Site Stream Battery A is listed in Appendix B. A separate chain of custody form is now filled out for each Battery Type. Each Battery is then logged by the Lab as a separate job which streamlines billing and reporting. GROUNDWATER MONITORING WELLS Groundwater monitoring wells are summarized in Table 6 showing well location, completion interval, elevation, total depths and other data. 5