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<br />2.04.7•'1-lydrology Description <br />.•.~ <br />Detailed hydrologic information includi <br />Revision <br />February 1982 <br />a description of the water <br />sampling program, summary of 1975-1980 results and 1981 results, are con- <br />tained in Appendices XII - XIV and Exhibits 2.04.5-A and 2.04.5-B. <br />Groundwater <br />The alluvium of the North Fork of the Gunnison River is the major aquifer <br />on the site. The alluvial,~extent is narrowly confined by the steep V-shaped <br />valley walls. One drill hole for the silo-.foundation study showed 48 feet '. <br />of alluvium. Depths are probably. as great as 70 feet in the middle of the <br />valley. <br />Quartz monzonite.is the predominant rock type in the alluvium with <br />i other igneous rocks such, as basalt also present-. Sandstone is•the only <br />sedimentary rock which is present due to the high energy level of the river <br />though its occurrence is rare. The particle size ranges from .sand size to <br />large cobbles. <br />Water level s. in the alluvial aquifer were within 10 feet of the ground <br />surface for all the holes drilled so far. Wells can be expected to yield <br />upwards of 500 gpm due to the high primary;transmissivity of_the'alluvial <br />gravels (Price and Arnow .1974, U.S..Department of Interior 1978). Recharge <br />is from the river itself during snowmelt season. Due to this high trans- <br />missivity, water quality in the alluvial aquifer is very similar to river <br />-;yti <br />~. <br />...~.:. <br />' .- ..,: <br />water. Known uses of water from this alluvial aquifer are presented in <br />Appendix XXIV-5, Table III'A.l; and Figure III A.1. <br />- The Crystal Meadows fill area .-has. been reclaimed and three wells are <br />being monitored for alluvial aquifer water quality. Well (CM3) is located <br />above the fill, well CM2 is completed in the fill and well CM3 is below the <br />~..`..... 2.04=21' <br />