Slug-Test Results From a Well Completed in Fractured Crystalline Rock, U.S. Air Force Plant 6, Marietta, Georgia
Gonthier, Gerard J.
Mayer, Gregory C.
MetadataShow full item record
Storativity in fractured crystalline rock typically is low; as a result, small amounts of injection to or discharge from wells completed in such rocks can have a measurable effect on water levels in the surrounding subsurface. Aquifer tests may be difficult in areas where ground water is contaminated because pumping may affect ground-water contamination plumes, and also result in the need to dispose of pumped contaminated water. Slug tests can be used to estimate hydraulic conductivity of the near-well region without pumping. Additionally, with adequate monitoring in a well field, slug tests can be used to assess aquifer interconnectivity between wells. Slug tests were performed in selected wells at U.S. Air Force Plant 6, Marietta, Ga., while nearby wells were monitored for water-level change. Preliminary results of one slug test show hydraulic conductivity in fractured crystalline rock at the site is small (0.1 feet per day) and that the aquifer at this location may be anisotropic. In the example presented herein, a well 108 feet northwest of the test well was more responsive than a well 11 feet north-northeast of the test well.