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SOP-012 Standard Operating Procedure Aquifer Testing Page 9 of 18 REVISION NO. 0 March 2020 Sharpe Army Depot • Change the recording frequency on the data logger to the appropriate frequency of data recording for the slug withdrawal test. The recording frequency will be specified in the project work plans but may be modified based upon a review of the slug-in test data. Concurrently with starting the data logger, immediately raise the slugging rod as quickly as possible such that the rod is completely out of the water column and above the static water level. Record the test initiation time on the appropriate form as outlined in the project work plans. • Continue to monitor water level rise with the pressure transducer/data logger, taking periodic water level measurements with the electric tape. Data logger and tape readings should be conducted in accordance with the schedule outlined in the project work plans and/or based upon a review of the slug-in test data. • The slug-out test may be terminated once the water level has risen to within 90 percent of the pre-test static or as specified in the project work plans. Once the slug-out test is terminated, take a physical water level measurement with the electric tape. Record the measurement and time on the appropriate form. • The data should be reviewed in the field to help ensure the validity of the test. Complete all documentation on the appropriate form as outlined in the project work plans. • The slug-in and slug-out tests may be repeated as necessary, and as required by the project work plans. • Once all tests are satisfactorily completed for the well, all downhole equipment may be removed and the wellhead secured. 3.3 Specific Capacity Testing Specific capacity tests are short-term single-well aquifer tests that are useful in highly transmissive units which preclude slug testing. The method consists of measuring the stabilized drawdown in the well while pumping at a uniform rate. The tests may be conducted in monitoring, extraction, and injection wells. Specific capacity tests can be conducted at the end of well development, using the pump utilized for development. While less accurate than long-term multiple-well pumping tests, specific capacity tests provide fast and easy to interpret data for estimating hydraulic conductivity and transmissivity in the immediate vicinity of the well being tested. • Newly installed wells to be specific capacity tested must be developed before beginning testing activities. • Inspect the equipment to ensure that it is in good working order. Specific capacity test equipment may vary widely depending on the formation and site conditions, the diameter and depth of the wells, and the number of the wells to be tested. The