APPLICABILITY OF SLUG INTERFERENCE TESTS FOR HYDRAULIC CHARACTERIZATION OF UNCONFINED AQUIFERS .2. FIELD-TEST EXAMPLES

Slug interference testing may be particularly useful for characterizin g hydraulic properties of aquifer sites where disposal of contaminated ground water makes pumping tests undesirable, The design, performance , and analysis of slug interference tests for two field test examples are presented, Results were compared with standard constant-rate pumpi ng tests, The comparison indicates that slug interference tests provid e estimates comparable to those obtained from short duration pumping t ests for the determination of transmissivity, storativity, and vertica l anisotropy. The close agreement in hydraulic property values obtaine d using the two test methods suggests that slug interference testing, under favorable test conditions (for example, observation well distanc es less than or equal to 30 m), can provide representative aquifer cha racterization results. The quality and extent of test data obtained al so indicate the potential use of slug interference testing for three-d imensional hydrologic characterization investigations, when conducted using multilevel monitoring facilities.