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State Reg. <br />• The U.S.G.S. operated a gaging station (Lat. 40,20'03"N Long. <br />107,08'19"W) between 1956 and 1973. The gaging station was then taken <br />over by the U.S.D.A., Science and Education Adminisiratin (SEA) in 1976 <br />and relabelled 1001 (see Exhibit 7-3). The station monitored a drainage <br />area of 34.50 square miles and was upstream from the confluence of the <br />two unnamed tributaries that drain Seneco II. In addition, two other <br />stations (1002, 1003) were established by the U.S.D.A: SEA on Fish Creek <br />downstream from the confluence of the two ephemeral streams. These <br />stations are being used to study the effects of the Energy Fuels <br />Number I Mine. Station 1003 monitors a basin of 77.5 square miles. <br />At the U.S.G. S. station between 1956 and 1973, the mean flow was <br />12.75 cfs. Peak flows ranging between 51 to 342 cfs occurred during <br />spring runoff without exception. Flow record was also maintained at <br />Station 1003. Data from this station are limited. However, peak flows <br />of 36 cfs for 1977 and 302.9 cfs for 1978 were recorded with both occur- <br />. ing during April. <br />duality data are limited to major cations and onions at all three sites. <br />Table 7-18 through 7-20 present statistical summaries of these data. As <br />can be seen, the dissolved constituents in the surface water increase <br />downstream. According to Woolhiser (1981), the Energy Fuels Mine is at <br />least partially responsible for this increase, however, the majority is <br />attributed to agricultural runoff. <br />As with data on the Yampa River, data received from the U.S.D.A.-$EA <br />on the Fish Creek Basin indicate that dissolved constituent concentro- <br />tions increase during low flow months and decrease during the high flow <br />months of spring and early summer. The maximums and minimums <br />presented in Tables 7-I8, 7-19, and 7-20 for the most part correspond <br />with low flows and high flows respectively. A complete listing of all <br />data is available from the U.S.D.A.-SEA in Fort Collins, Colorado. As <br />mining progresses into the Fish Creek watershed, these data will be <br />• checked to determine if there is a deteriorating effect on Fish Creek due <br />to the mining of Seneca II. <br />7-59 Revised 5/27/81 <br />