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All surface bodies of water, impoundments, and irrigation diversions in the general azea are shown on Map 15, <br />Alluvia] Valley Floor and Water Rights. <br />• Known Uses of Surface Water <br />Area surface water utilization is limited to the perennial streams of Trout Creek and Fish Creek and consists primarily <br />of flood-irrigated agricultural operations. A relatively minor amount of surface water is utilized for stock watering <br />which is the only other significant use of surface water in the Trout Creek drainage. Domestic utilization of surface <br />water in the general azea is limited by intermittent stream flows, low flow volumes, and relatively poor water quality. <br />Registered surface water rights in the permit and adjacent areas aze listed in Table 12, Summary of Surface Water <br />Rights, and aze shown on Map 15, Alluvial Valley Floor and Water Rights. <br />Flow Characteristics of Surface Drainaees <br />The flow characteristics of azea streams generally reflect topographic and geologic conditions as well as <br />climatological factors. As previously noted, the Twentymile Park structwal basin controls azea surface water <br />movements. Structural trends are generally reflected in the surface topographic configuration, with area streams <br />flowing from southwest to northeast along the northeastward plunging axis of the basin. Locally, the geologic <br />structure is also significant with respect to the pattern and characteristics of ground water dischazges to the surface <br />water system. Localized variations in geologic stutctwe and lithology aze typically reflected in the configuration of <br />stream channels and their associated floodplains. <br />A number of climatological and environmental factors aze significant with respect to the surface hydrologic regime. <br />Limited annual precipitation, combined with the occurrence of most of the precipitation as snowfall, are the principal <br />factors affecting azea streamflows. Snow, which has accumulated over the winter, melts rapidly as temperatwes <br />increase in the spring. This rapid snowmelt and consequent runoff result in a short period of high stream-flows <br />• extending from mid-spring through the eazly-summer months. With increased tempentwes and decreased <br />precipitation during the summer and fall months, soil moistwe levels, which approached saturation during spring- <br />melt, aze rapidly depleted. Under these conditions, most of the limited precipitation received infiltrates into the upper <br />soil horizons and is subsequently released through evaporation or transpiration. Runoff, except in response to major <br />storm events, is insignificant and streamflows decrease accordingly. <br />The U.S. Geologic Swvey -Water Resowces Division (USGS-WRD), CYCC and TCC have collected considerable <br />information on the flow characteristics and water quality of major and tributary drainages. Principal surface water <br />monitoring locations in the general azea aze shown on the Twentymile Pazk Hydrology Map (Map 13). Streamflow <br />data aze presented in Table 10, Surface Water Data. <br />Foidel and Middle Creeks flow only in response to spring snowmelt and major storm events. The seasonal variations <br />in streatnflow characteristics above and below the mine plan area on Foidel Creek aze illustrate by Figwes 5-a through <br />5-c, Streamflow Hydrographs. Former USGS Station 09243800 (now TCC site 800) is located immediately upstream <br />of the mine plan azea. Monitoring of flows at this station was discontinued in October, 7 983, and resumed in October <br />1984. CYCC Site 14, located about 3,500 feet upstream of the USGS station, consists of a weir and staff gage for <br />monitoring flow on Foidel Creek immediately upstream of the south tributary. Flow measwements have often been <br />taken several times per month during the spring and summer flow periods since Mazch of 1982. A comparison of <br />hydrographs during the 1982 and 1983 water years shows that considerably higher flows have occurred at the USGS <br />Station 09243800 downstream of Site 14, appazently as a result of contributions from the south tributary to Foidel <br />Creek including runoff from portions of the Eckman Park Mine (Figure 5-a). The streamflow hydrographs in Figwe <br />5-a and the average monthly summary for USGS Station 09243800 in Figure 5-b show that over 80 percent of the <br />present runoff occurs as snowmelt runoff in April and May. <br /> <br />TR06-52 2.04-3] 02/1 i/06 <br />