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Work plan DRAFT 9 <br />40 3.2 Surface water hydrology <br />Previous work in the Collom area has been conducted to characterize local streams, <br />springs, and seeps including: <br />• Colowyo Alluvial Valley Floor Analysis Report by Dames and Moore, <br />December 1995. <br />• Jurisdictional Waters Report Executive Summary, Seep and Spring <br />Survey Wetlands and Waters of the US Survey, Good Spring Creek <br />Jurisdictional Wetlands Survey and Riparian Habitats Survey, Study <br />Area C by JBR Environmental Consultants, September 1998. <br />Information from these studies will be used for surface water baseline. Additional work <br />will include installation of Parshall flumes at upstream and downstream locations near <br />the alluvial wells to measure streamflow. Crest stage gages may also be installed to <br />help identify peak flows. Preliminary surface water monitoring locations are shown on <br />Plan 1. Table 3.3 shows preliminary flume sizes for each of the monitoring locations. <br />Table 3.3 Preliminary flume sizes for surface water monitoring sites <br />Surface water quality analytes are summarized below in Table 3.4. Field parameters <br />including flow, pH, EC, Dissolved Oxygen (DO), and temperature and will be measured <br />monthly on perennial streams and perennial springs and seeps. Water quality samples <br />will be collected quarterly from perennial streams springs and seeps. Surface water <br />samples will not be filtered. <br />• <br />2572 -R1 <br />Colowyo Coal Company, L.P. <br />Water Management Consultants <br />Station <br />Drainage <br />area <br />(sq mi) <br />Throat <br />width <br />(in) <br />Depth <br />(in) <br />Max <br />flow <br />(cfs) <br />Min <br />flow <br />(cfs) <br />Upper Straight <br />6.3 <br />12 <br />18 <br />5.6 <br />0.35 <br />Lower Straight <br />7.0 <br />12 <br />18 <br />5.6 <br />0.35 <br />Upper Collom <br />4.0 <br />12 <br />18 <br />5.6 <br />0.35 <br />Lower Collom <br />5.1 <br />12 <br />18 <br />5.6 <br />0.35 <br />Lower Little Collom <br />2.9 <br />12 <br />18 <br />5.6 <br />0.35 <br />Upper West Jubb <br />0.5 <br />9 <br />15 <br />3.1 <br />0.07 <br />Lower West Jubb <br />1.6 <br />9 <br />15 <br />3.1 <br />0.07 <br />Surface water quality analytes are summarized below in Table 3.4. Field parameters <br />including flow, pH, EC, Dissolved Oxygen (DO), and temperature and will be measured <br />monthly on perennial streams and perennial springs and seeps. Water quality samples <br />will be collected quarterly from perennial streams springs and seeps. Surface water <br />samples will not be filtered. <br />• <br />2572 -R1 <br />Colowyo Coal Company, L.P. <br />Water Management Consultants <br />