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SOP-012 Standard Operating Procedure Aquifer Testing Page 11 of 18 REVISION NO. 0 March 2020 Sharpe Army Depot plans. Observe and record the wellhead flow meter readings at intervals specified by the project work plan. Record these measurements and the time on the appropriate form. • Once the drawdown appears to stabilize (i.e., the water level under pumping is relatively stable), continue pumping for a sufficient length of time as specified in the project work plans. The criterion for stabilization of water levels and drawdown will be specified in the project work plans. During this time period, continue to physically measure and record the water levels at intervals stated in the project work plans. • Once the specified time period has elapsed, take a physical water level measurement with the electric tape and shut the pump down. Record the measurement and time on the appropriate form. • The data should be reviewed in the field to ensure that valid data have been collected. This includes verification that discharge was maintained at a constant rate, and the drawdown stabilized at the minimum required magnitude. Complete all documentation on the appropriate form as outlined in the project work plans. • The specific capacity test 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 then be removed and the wellhead secured. 3.4 Aquifer Pumping Test Methods The pumping test methods covered in this section include step-drawdown tests and constant rate pumping tests. A step-drawdown test is conducted for the pumping well and is recommended prior to initiation of any constant rate pumping test. The data provided by the step drawdown test is used to evaluate well performance and determine the optimum discharge for the subsequent constant rate test. The step drawdown test entails conducting three or more steps of increased discharge while monitoring water level drawdown. This effectively produces successive stepped drawdown curves. Aquifer testing may potentially be discontinued at a well after the step-drawdown pumping test if: 1) only a single well pumping test is planned, and 2) the step-drawdown test provides all the necessary data of a single well pumping test. The constant rate pumping test method involves the pumping of water from a well at a constant rate and monitoring the water level drawdown in response to the pumping. Water level recovery may also be monitored after the pumping is discontinued. Water level monitoring may be limited to the pumping well (single-well pumping test) or include one or more nearby observation wells (multiple-well pumping test). The single-well