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o N N en Part of the second Redstone well test involved analyses of the connection between the Leadville Limestone and overlying alluvium. During this test, the Redstone 21-9 well, which is com- pleted in the Leadville Limestone, discharged continuously for 4 days at an average rate of 1,830 gal/ min, resulting in the removal of 10.5 million gallons (1.4 million cubic feet) of water from the lime- stone. Water-level fluctuations in 3 alluvial wells, USBR nos. 1,3, and 11, and discharge fluctuations of 3 springs, Graves B, Hobo, and Yampa, were monitored as flow from the Redstone 21-9 well was manipulated. These observations indicated that a connection exists between the Leadville Limestone and the alluvium that is modified by proximity to the Colorado River. Responses of alluvial wells and springs during the second Redstone well test varied consider- ably. Water levels in the USBR no. 1 well decreased 0.83 ft during the flow phase of the test, began recovering as soon as the flow phase ended, and recovered 0.65 ft by the end of the recovery-moni- toring period. Water levels in the USBR no. 3 well decreased 0.29 ft from the start of the flow period to the end of the recovery period. Water levels in the USBR no. 11 well remained constant during the flow period and decreased 0.18 ft during the recovery period. The discharge of the Graves B Spring decreased 13 gal/min during the flow phase of the test; the discharge of the Hobo Spring decreased 7 gal/min during the flow phase of the test. Both springs returned to pretest discharge rates by the end of the recovery period. No observed changes in the discharge of the Yampa Spring during the test could be attributed to flow from the Redstone 21-9 well; all observed changes are believed to have been caused by commercial manipulation of the spring outlets. The amount of response exhibited by monitored wells and springs to the Redstone 21-9 well during the study primarily was determined by the distance from the production well. The Graves B Spring, 315 ft from the production well, had the largest decrease in discharge during the test. The Hobo Spring, about 1,000 ft from the production well, had a smaller decrease in discharge; the Yampa Spring, about 4,200 ft from the production well, had no detectable change in discharge due to the Redstone 21-9 well. The amount of response exhibited by monitored wells and springs to the Redstone 21-9 well during the study primarily was determined by the distance from the production well. The Graves B Spring, 315 ft from the production well, had the largest decrease in discharge during the test. The Hobo Spring, about 1,000 ft from the production well, had a smaller decrease in discharge; the Yampa Spring, about 4,200 ft from the production well, had no detectable change in discharge due to the Redstone 21-9 well. Well USBR no. 1, about 790 ft from the production well, had the largest drawdown of all monitored alluvial wells. Well USBR no. llj about 2,500 ft from the production well, had the smallest drawdown of the monitored alluvial wells. Well USBR no. 3, about 590 ft from the Redstone 21-9 well, was closer to the production well than USBR no. 1 but had a smaller drawdown. Drawdown and recovery in the alluvial wells were in phase with the production well only in USBR no. 1. Except for USBR no. 3, the monitored wells and springs clearly demonstrated a decreasing affect of the production well with increasing distance from it. Water-level fluctuations in USBR no. 11 were completely out of phase with flow from the Redstone 21-9 well. Water levels in USBR no. 11 remained constant while the Redstone 21-9 well was flowing and declined after flow stopped. This pattern indicates that USBR no. 11 was not af- fected by the Redstone 21-9 well but was affected by some other factor. Like USBR no. 3, USBR no. 11 is less than 500 ft from the Colorado River. In fact, it is located nearly at the rim of the river's north bank. The water level in USBR no. 11 remained constant while the river stage was nearly constant and began declining only when the stage of the river began declining. A water-level de- crease of 0.18 ft in the well is consistent with a stage decrease of 0.23 ft. The fluctuation of water A-14