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movement and use. There aze presently no known users of ground water from this aquifer in the <br />permit and adjacent azeas. <br />The Quaternary terrace deposits are at best limited aquifers. These deposits have a coarse <br />gravel-boulder layer at their base which tends to drain the deposits to the side slopes of the Animas <br />River Valley. The terrace deposits do not supply subirrigation to crops. These terrace deposits are <br />currently used regionally for dry land wheat farming. <br />The alluvium of the Animas River is a regional aquifer located 400 feet below the main mining <br />operation. The alluvium is poorly sorted and coazse with ground water levels coincident with the <br />river. The alluvial body thins and becomes narrow at the point where the Animas River cuts through <br />the Pictured Cliffs Sandstone and Fruitland Formation. <br />Surface Water Hydrology <br />The Carbon Junction Mine is located within the Animas River Drainage Basin. The mine is located <br />within the valley of the upper reach of Cazbon Junction Canyon. The stream which drains the site is <br />intermittant and has a steep gradient and a deeply incised channel. Stream Flow in Carbon Junction <br />Canyon is directly tributary to the Animas River to the southwest. The drainage basin of Carbon <br />Junction Canyon is 0.8 squaze miles. <br />The stream Flows along the contact of the Pictured Cliffs Sandstone and the Fruitland Formation. <br />This stream recharges these strata upgradient and receives discharges from these strata in the form <br />of seeps and springs down gradient. <br />The flows in the stream fluctuate seasonally and in response to thunderstorm events. Highest flows <br />occur during snowmelt and during early summer when precipitation events are more frequent. Some <br />baseflow to the stream is provided by springs in the stream channel. Spring and seeps, however, do <br />not provide enough flow to sustain stream flow from mid summer and early fall when evaporation <br />and transpiration are high. <br />The water in the stream of Carbon Junction Canyon is not diverted up- or down- stream of the mine <br />for flood or subirriga[ion of crops. Any use of water derived from Carbon Junction Canyon would <br />be through diversion of Animas River water downstream of the confluence of these two streams. <br />The water quality of the stream in Carbon Junction Canyon fluctuates seasonally. The water quality <br />in the stream is generally better during periods of high flow and gradually decreases in quality as <br />spring flows become more dominant. <br />The quantity of water from Cazbon Junction Canyon tributary to the Animas River would be <br />insignificant to the overall flow of the river. The drainage basin of Carbon Junction Canyon is only <br />0.8 square miles compared [o over 1090 square miles for the Animas River above the Colorado-New <br />Mexico state line. <br />