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r <br />in Rito Seco have not been observed during the recording <br />period, and because the tributary drainages do not provide <br />1 perennial flow, corroboration over the entire curve has not <br />been fully completed and will continue. <br />Surface flow measurements were difficult to obtain during <br />portions of the winter months. Extreme temperature conditions <br />caused large ice blockages in the stream. A summary of the flow <br />data collected to date from the three original gaging stations <br />(RS-1, RS-2 and RS-3) is presented in Tables G.2-2 through G.2- <br />4. Gaging stations RS-4 and RS-6 have not had any flow, and <br />station RS-5 was installed in August 1988 and has not been in <br />place during any prior readings. <br />A review of the instantaneous discharge data obtained <br />by current meter readings shows that flows in Rito Seco <br />experience no measurable gains or losses througt, the mining <br />property. The data indicate that the flow in the creek channel <br />remains above the surface through this reach, with no <br />measurable interchange with the adjacent alluvium. However, <br />based on limited water level data from wells completed in the <br />Santa Fe Conglomerate, the Rito Seco and the Santa Fe <br />Conglomerate appear to be hydraulically connected. <br />The unnamed tributary on which station RS-3 is located <br />is the only station on a tributary which has demonstrated a <br />perennial flow to date. The flow is sustained by a spring fed <br />from a higher elevation. <br />G.2.3 100-Year Floodolain Limits <br />I The 100-yr flood flows on Rito Seco, and the <br />corresponding floodplain limits, have been delineated from the <br />upstream end of the mine property to the downstream location <br />where Rito Seco flows onto the alluvial plain. <br /> <br />G-13 <br />