2008-05-06_REPORT - C1980005 (2)

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• Table 7 Summary of Surface water Monitoring Sites, Seneca II Mine, Routt County, Colorado Site Name (Computer ID,) NPDES 002 (NPDES2) NPDES 003 (NPDES3) NPDES 004 (NPDE54) NPDES 007 (NPDES7) NPDES 008 (NPDESS) SW-S2-1 (SSG1) sw-s2-2 (SSG2) SW-S2-3 (SSG3) SW-S-4 (SSG4) SW-S-S (SSLGS) SW-S2-6 (SSC6) SW-S2-7 (SSLG7) SW-S2-8 (SSRB) SW-S2-9 (SSB9) Drainage and Elevation (See Exhibit 7-2) Lower Little Grassy Creek 6614 feet Discharges into Lower Grassy Creek, 6577 feet Upper Cow Camp Creek 6947 feet Upper Bond Creek Upper Bond Creek 7015 feet Upper Grassy Creek 6595 feet Lower Grassy Creek water quality at 6565 feet CSG at 6575 feet Lower Northwest Diversion Ditch (see Exhibit 7-7) Upper Northwest Diversion Ditch Upper Little Grassy Creek 6790 feet Upper Cow Camp Creek 6875 feet Secondary inlet to Wadge Impoundment Gully at wolf Creek revision area Upper Bond Creek Type of Flow Measurement and Remarkal,2 Continuous recorder with 3-foot H-flume (site referred to as Wadge Impoundment) Continuous recorder with 2-foot H-flume (site referred to as Shop Reservoir or Northwest Impoundment) Continuous recorder with 1-foot Parahall flume Continuous recorder with 1-foot Parahall flume, discontinued 1987 Continuous recorder with 1-foot Parahall flume, replaces NPDES 007 Crest Stage Gage (CSG) site, Q VA Quality sample taken at site below NPDES 003 discharge; Q VA, CSG upstream of NPDES 003 discharge on Lower Grassy Creek (reported flows include NPDES 003 flow) Monitored fly ash area drainage; discontinued when Colorado Ute Electric Association bought property; rainatituted June 1997 Discontinued per CMLRD'a response to the Seneca II Mine 1983 AHR (April 1984) CSG site, Q = VA (high flow), Q H ~ S (low flow) Q = VA (high flow), Q B & S (low flow); CSG site, discontinued 1997 Discontinued (primary inlet is Little Grassy Creek) Temporary site; destroyed by mining Q = VA (high flow), Q = B & S (low flow); CSG site Discontinued, replaced with NPDES 008 D