Aquifer Test Report Galena Airport Alaska

In August 1993, the Air Force conducted aquifer tests near the POL saddle Tank Site ST05 at Galena Airport, Alaska. Aquifer test data was acquired in seven observation during a short-term 9.5 hour pumping test in conjunction with downhole heat-pulse flowmeter recordings in six wells. Analysis of drawdown and recovery data from the pumping test showed the transmissivity ranges from 24,000 to 120,000 ft 2day with an overall increase with depth consistent with the coarsening nature of the Yukon River aquifer material. The calculated storativity values range from 0.05 to 0.0006, generally decreasing with depth, indicating that shallow unconfined conditions transition to confined conditions at depth. Using an affected aquifer thickness of 100 ft, the hydraulic conductivity ranges from 241 to 1203 ftday. Average groundwater velocity ranges from 0.31 to 1.56 ftday. For each 10-ft aquifer zone, the flowmeter velocities were consistently 3.2 to 20 times higher than the calculated velocity from the pumping test. The objectives of the aquifer testing were met-the pumping test provided useful estimates for hydraulic parameters. In addition, the flowmeter, proved to be useful in identifying discrete aquifer zones of high velocity, although velocity estimates did not agree well with those derived from the pumping test.