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Mobil Oil Corporation personnel have designated at least four sandstone intervals, A-D (top to bottom), on the single-point resistivity logs of wells drilled in the South Trend Development Area, This report presents timedrawdown data reported by Mobil Oil Corporation from singly (A or B or C or D sandstone interval) and multiply (A, B, C, and D sandstone intervals) completed wells for the August 16-17, 1982 aquifer test at the South Trend Development Area Site 1. This report also describes the results of flowmeter and brine-injection tests by the U.S. Geological Survey in monitoring well 16P52. Well 16P52 is open to sandstone intervals A, B, C, and D. On July 26, 1982, water was injected at a rate of 1.43 cubic feet per minute above the A sandstone interval in well 16P52. Based on flowmeter data, the calculated rates of flow were 1.23 cubic feet per minute between the A and B sandstone intervals, 0.63 cubic foot per minute between the B and C sandstone intervals, and less than 0.17 cubic foot per minute between the C and D sandstone intervals. Based upon brine-slug-injection tests conducted during August 1982, the calculated flow rates between sandstone intervals A and B are as follows: 0.01 cubic foot per minute upward flow (B to A) about 5 hours after pumping began for the aquifer test; 0.004 cubic foot per minute upward flow (B to A) about 21 hours after pumping began; and 0.0 cubic foot per minute about 46 hours after the pump was turned off. All other brine-slug-injection tests measured no flow. INTRODUCTION The U.S. Minerals Management Service (MMS) and the New Mexico Environmental Improvement Division (BID) have a basic responsibility for the appraisal of Mobil Oil Corporation's insitu uranium-leaching procedures on public land near Crownpoint, McKinley County, New Mexico (fig. 1). The company intends to leach uranium ore in situ from the Westwater Canyon Member of the Morrison Formation. One aspect of the agencies* responsibility is to insure that ground-water-quality monitoring is accomplished before, during, and after in situ leaching operations. Based on guidelines provided by MMS and EID, Mobil has constructed monitoring wells on the perimeter of the project area (fig. 2). These monitoring wells are open to several ore-bearing and non-ore-bearing interbedded sandstones in the Westwater Canyon Member. MMS and EID requested the U.S. Geological Survey to extend a study of insitu uranium leaching, in progress, into the South Trend Development Area Site 1 location in order to investigate flow characteristics in multiply completed wells. Purpose The purpose of this report is to: (1) Present some of Mobil Oil Corporation's aquifer-test data from the South Trend Development Area Site 1; (2) document the U.S. Geological Survey brine-slug-injection test results from monitoring well 16P52 during the Site 1 aquifer test; and (3) document the U.S. Geological Survey injection and flowmeter test results from monitoring well 16P52. Scope This report is limited to documenting: 1. Time-drawdown data during the August 16-17, 1982, aquifer test at the South Trend Development Area Site 1. 2. Flowmeter data during injection testing of a monitoring well open to the A, B, C, and D sandstone intervals on July 26, 1982. 3. Brine-slug-injection data in a monitoring well open to the A, B, C, and D sandstone intervals during the August 16-17, 1982, aquifer test at the South Trend Development Area Site 1, and on August 19, 1982. 4. Calculating the intraborehole flow, the brine-slug-injection data.

Aquifer-test data and borehole flow test results from monitoring well 16P52 at the South Trend development area number 1, McKinley County, New Mexico