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Baseline Hydrologic Monitoring Plan — Hansen Project 13 <br />intermittent streams and springs on the southeast side of Waugh Mountain. Flow rates for Middle <br />Tallahassee Creek vary based on the sampling site. Middle Tallahassee Creek upstream of the Hansen <br />Deposit (at station SW11 -MT) has been consistently dry when monitored from 2011 — 2013. The creek <br />was flowing at SW11 -MT during only one of eleven recent sampling events (I" Quarter 2011). The <br />maximum flow rate for Middle Tallahassee Creek was 0.95 cfs at station SW14 -MT in June, 2010. Since <br />3rd Quarter 2011, Middle Tallahassee Creek has been dry at SW14 -MT. The average stream gradient <br />within the Project boundary is 30 ft/mi. <br />2.2.2.6 Hall Gulch <br />Hall Gulch is a very small perennial stream that flows down steep ravines off of an east trending ridge of <br />Waugh Mountain. In the southern extent of the Project boundary, the stream gradient decreases as it enters <br />an open riparian area near the confluence with Middle Tallahassee Creek. The stream is fed by a system of <br />very small, spring -fed, intermittent streams. Flow rates for Hall gulch show a seasonal trend with high <br />flow during spring and low flow during fall. The maximum flow rate for Hall Gulch was 0.26 cfs at station <br />SW19 -HG in June 2010. The average stream gradient is 60 ft/mi within the Project boundary. <br />2.2.2.7 Fear Creek <br />Fear Creek is a small perennial stream that flows from the saddle between Loco and Burris Mountains. The <br />stream flows down a steep narrow canyon until it enters a broad open area near the Project boundary. The <br />stream is fed by a system of steep ravines off of the slopes of Loco and Burris Mountains. The maximum <br />flow rate for Fear Creek was 0.86 cfs measured in March 2013. Recent data collected from 2011 to 2013 <br />indicates that Fear Creek has very low flow ( <0.05 efs) during the summer, fall, and winter, and higher <br />flow during the spring. <br />The sampling site for Fear Creek is located '/2 of a mile upstream from its entrance to the Project boundary. <br />This location is one mile upstream from the confluence with Middle Tallahassee Creek. The average <br />stream gradient is 40 ft/mi within the Project boundary. <br />Table 4. Historical Monthly Average Stream Flow Rates (cfs) <br />Year <br />Month <br />4401 <br />4402 <br />4403 <br />4404 <br />4405 <br />4406 <br />4407 <br />4408 <br />4409 <br />1978 <br />May <br />0 <br />0.094 <br />0 <br />0.013 <br />0 <br />0.005 <br />0.004 <br />0.040 <br />0.017 <br />June <br />0 <br />0.061 <br />0 <br />0.011 <br />0 <br />0.014 <br />0.007 <br />0.066 <br />0.029 <br />July <br />0.003 <br />0.024 <br />0 <br />0.024 <br />0 <br />0 <br />0.001 <br />0.039 <br />0.021 <br />Au ust <br />0 <br />0.017 <br />0 <br />0.005 <br />0 <br />0 <br />0 <br />0 <br />0.043 <br />September <br />0 <br />0.030 <br />0 <br />0.004 <br />0 <br />0 <br />0 <br />0 <br />0.007 <br />October <br />0 <br />0.024 <br />0 <br />0.002 <br />0 <br />0 <br />0 <br />0 <br />0 <br />November <br />0 <br />0.040 <br />0 <br />(W) <br />0 <br />0 <br />0 <br />(W) <br />0 <br />December <br />0 <br />0.097 <br />0 <br />(W) <br />0 <br />0 <br />0 <br />(W) <br />0 <br />1979 <br />January <br />0 <br />(w) <br />0 <br />(W) <br />0 <br />0 <br />0 <br />w) <br />0 <br />February <br />0 <br />(W) <br />0 <br />(w) <br />0 <br />0 <br />0 <br />(W) <br />0 <br />March <br />0 <br />(w) <br />0 <br />(W) <br />0 <br />0 <br />0 <br />(W) <br />0 <br />Notes: <br />Based on results of Cyprus baseline monitoring program; no data available for Stations 4410, 4411, and 4412 <br />(w) = Winter conditions prohibited accurate monitoring; trace of flow possible. <br />Stream flow measurements from 2008 to 2013 are provided in Appendix I. <br />4153A.140129 Whetstone Associates • <br />