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-15- The interbedded and lenticular strata of the Lower Fruitlands Formation support local discontinuous aquifer systems. Water bearing zones were observed at the base of the Lewis ("C) coal zone, 1.3 feet thick; above the Shamrock ("A") coal zone, 96 feet thick; and above the Shamrock rider coal zone, 17 feet thick. Two monitoring wells, 17-8 and 82-5, are completed in the first two water bearing zones respectively. The water bearing zone associated with the Shamrock coal overburden was air lift bailed at about 50 gpm with no measureable drawdown. This indicates that the Shamrock coal overburden may produce significant inflows to the pit. Pueblo Coal Company has applied for a well permit to drill and use water from the water-bearing zone associated with the Shamrock rider seam. This zone was encountered in borehole 84-2 (see Map 4-2). An estimated yeild of 150 gpm was measured in an airlift during drilling. Water from this well will be used in the coal wash plant operations. At the Chimney Rock mine, about 30 miles east of the proposed Carbon Junction mine, pumping tests were run on the Lower Fruitland Formation. These pumping tests yielded a value for transmissivity (T) of 210 gallons per day per foot (gpd/f t) and a value for storativity (S) of 1.3 x 10-4. These values indicate that the Lower Fruitland Formation will support limited ground water movement and use. There are presently no known users of ground water from this aquifer in the permit and adjacent areas. The Quaternary terrace deposits are at best limited aquifers. These deposits have a coarse gravel-boulder layer at their base which tends to drain the deposits to the side slopes of the Animas River Valley. The terrace deposits do not supply subirrigation to crops. These terrace deposits are currently used regionally for dry land wheat farming. The alluvium of the Animas River is a regional aquifer located 400 feet below the main mining operation. The alluvium is poorly sorted and coarse with ground water levels coincident with the river. The alluvial body thins and becomes narrow at the point where the Animas River cuts through the Pictured Cliffs Sandstone and Fruitland Formation. VI. Surface Water Hydrology - Rules 2.04.5, 2.04.7, 2.05.6(3) and 4.05 The applicant has supplied sufficient information on surface water for the Division to make its findings. Information within the permit application can be found on Section 2.04.7(2) and Map 4-3 of the application and in responses to adequacy questions dated February 13 and May 4, 1983. The following description of surface water is a summary of available information on surface water in the general area of the proposed mine. The proposed Carbon Junction Mine is located within the Animas River Drainage Basin. The mine is to be located within the valley of the upper reach of Carbon Junction Canyon. The stream which drains the site is intermittent and has a steep gradient and a deeply incised channel. Stream flow in Carbon Junction Canyon is directly tributary to the Animas River to the southwest. The drainage basin of Carbon Junction Canyon is 0.8 square miles.