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• HYDROLOGIC ANALYSIS <br />YAMPA RIVER ALLUVIUM, BIG BOTTOM AREA <br />INTRODUCTION <br />This report presents the results of the test pumping of well YAW-5 located <br />in the Big Bottom area of the Yampa River valley near our Eagle Mine No. 9 <br />(Figure 1). This well is located directly aver the panel to be mined <br />first in the proposed expansion of the Eagle Mine No. 9. Tn our submittal <br />of April 1982, the results of the slug testing of wells completed in the <br />Big Bottom area were presented. The local geology and well construction of <br />the pumping test wells were presented in that submittal. <br />• TESTING <br />The pumping test array consists of four wells (Nap III-11), the pumping welt, <br />YAW-5 and three observation wells - YAW-4, YAW-6 and YAW-7. Well YAW-5 <br />was pumped for 100 minutes on May 5, 1982 at 3 to 4 gpm. Because the <br />pumping rate was not held constant during the test, the well was retested <br />the next day. <br />On May 6, well YAW-5 was pumped for 45 minutes at 3.5 gpm. The test was <br />terminated when the pumping water level had almost reached the pump intake. <br />Following termination of pumping, water level recoveries were measured for <br />35 minutes, at which time the water level in the pumped well had recovered <br />approximately 100%. <br /> <br />