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l'l"~1'J') U .~) _L .+ ~... I"", Table 3. High- and low-streamflow synoptic sampling sites [ce, Clear Creek drainage; ac, Geneva Creek drainage; identification number is either an eight..<Jigit USGS downstream order number or the latitude and longitude of the site with a two-digit sequence number at the end; see figure 3 for site location] SI'e number CCI CC2 CC3 CC4 CC5 CC6 CC7 CC8 CC9 CCIO CCII GCI GC2 GC3 GC4 GC5 GC6 GC7 GC8 GC9 GCIO GCII GCI2 U.S. Geological Survey Identification number 393606105422118 393647105425317 393642105430416 393804105423413 06714400 393946105422203 06714600 393819105452801 06714800 394211105414100 394027105393900 393504105432312 393458105431511 393433105433210 393243105430814 06704500 393348105460415 393153105440109 393141105445808 393018105421707 393028105421706 06705500 392735105394705 Site name South Clear Creek near GuaneIJa Pass, Colorado South Clear Creek above Naylor Creek near Georgetown, Colorado Naylor Creek at mouth near Georgetown, Colorado South Clear Creek helow Naylor Creek near Georgetown. Colorado South Clear Creek above Lower Cabin Creek Reservoir near Georgetown, Colorado South Clear Creek above Clear Lake near Georgetown, Colorado South Clear Creek above Leavenworth Creek near Georgetown, Colorado Leavenworth Creek above Waldorf Mine near Georgetown, Colorado Leavenworth Creek at mouth near Georgetown, Colorado South Clear Creek at Georgetown, Colorado West Chicago Creek near Idaho Springs, Colorado Duck Creek above Duck Lake West Branch near Grant, Colorodo Duck Creek above Duck Lake East Branch near Grant. Colorado Duck Creek below Duck Lake near Grant, Colorado Duck Creek above Mill Gulch near Grant, Colorado Duck Creek near Grant. Colorado Geneva Creek above: Smelter Gulch near Grant, Colorado Geneva Creek above: Duck Creek near Grant, Colorado Bruno Gulch above Geneva Park near Grant, Colorado Geneva Creek above Scott Gomer Creek near Grant, Colorado Scott Gomer Creek at mouth near Grant, Colorado Geneva Creek at Grant, Colorado Geneva Creek near Grant. Colorado in table 4 and shown in figure 4. Six sites were sampled during snowmelt conditions, and five sites were sampled during rainstorm-runoff conditions. Discharge or flow rate was measured at most sites with a bucket or container by the volumetric method (Rantz and others, 1982). Discharge was calculated by dividing the volume of water captured in the container by the time required to capture that water. Multiple measurements were averaged and converted to cubic feet per second. Field measurements of specific conductance, water temperature, dissolved oxygen, and barometric pressure were made onsite (M.A. Sylvester and others. U.S. Geological Survey, unpub. data, 1990). Turbidity and pH were measured from samples taken from the chum splitter. Samples for inorganic analysis were collected by the dip method at the end of culverts or in the centroid of flow and processed and preserved as described for stream samples (Ward and Harr, 1990). Samples for total and dissolved organic carbon analyses were collected by the dip method and processed and preserved as described for stream samples (Ward and Harr, 1990). Samples for trace organic (two sites) and gross oil and grease (three sites) analyses were collected in baked glass bottles by the dip method. The organic samples were collected in baked glass bottles and preserved by chilling to less than 40C (Ward and Harr, 1990). Suspended-sediment samples were collected by the dip method (flows were too shallow for EWI methods) and submitted for concentration and particle-size analysis (Guy, 1969). METHODS OF DATA COLLECTION AND ANAL VSIS 9