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Baseline Hydrologic Monitoring Plan — Hansen Project 25 <br />3.1.2 Middle Tallahassee Creek and its Tributaries <br />Three sampling sites have been established for Middle Tallahassee Creek. The first station (SW11 -MT) is <br />located about one half mile upstream from the entrance of Middle Tallahassee Creek to the Project area. <br />The second station (SW22 -MT) is located at the point that the stream exits the Project area. The third <br />station (SW 14 -MT) is located outside of the Project boundary above the confluence with North Tallahassee <br />Creek. From 2008 to 2010, SW14 -MT typically had flow rates greater than 0.1 cfs, but in 2011 to 2013 the <br />station has typically been dry. <br />Two tributaries to Middle Tallahassee Creek include Fear Creek and Hall Gulch. The sampling site for <br />Hall Gulch, SW12 -HG is located upstream of the Hansen Project and about one mile upstream from the <br />confluence with Middle Tallahassee Creek. These tributaries have also typically been dry in 2011 to 2013. <br />3.1.3 Cottonwood Creek and its Tributaries <br />Four surface water stations have been established on Cottonwood Creek and its tributaries (Salt Creek and <br />Squaw Creek) on the northern and western portion of the Project area. <br />There are two sampling sites for Cottonwood Creek. The first station (SW07 -CO) is located at the stream's <br />entry to the CUP boundary. The second station (SW08 -CO) is located at the streams exit from the CUP <br />area. <br />The sampling site for Salt Creek is located 3/4 of a mile upstream from the confluence with Squaw Creek. <br />The stream gradient of Salt Creek is about 80 ft/mi. The headwaters of Salt Creek are at Taylor Soda <br />Springs, a calcareous spring with high concentrations of dissolved salts that originates in the Echo Park <br />Formation. <br />The sampling site for Squaw Creek is located about 1.5 miles upstream from the confluence with Salt <br />Creek. <br />3.1.4 Additional Surface Water Stations <br />Any new stations that are added to the monitoring program will be field verified. For accurate flow <br />measurement, locations will be selected that have a uniform reach with steady flow and no bends, curves, or <br />backwater effects. Where samples are to be collected downstream of a confluence, the sample location will be <br />selected at least 100 feet downstream of the confluence or as appropriate to allow proper mixing of stream <br />waters. <br />4153A.140129 Whetstone Associates • <br />