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Aquifer Testing Standard Operating Procedure SWE-FSOP-500,•Revision 0 Ahtna Southwest Environmental Operations • Continue pumping and recording water levels and flow meter readings in the first step as long as required by the project work plans. • Once the first step is ended, measure the water level with the electric tape and record depth and time.Adjust the data logger as necessary(based upon a review of data from the first step) or specified in the project work plans for beginning the second step of the test. • Without turning the mechanical pump off, initiate the second step of the test by changing the pumping rate with the valve or flow regulator to the rate specified by the project work plans. • Monitor the water levels and flow meter readings. • Repeat the cycles of changing the pumping rate and recording water depth as often as required (for each step of the step-drawdown test) by the project work plans. • Once the last step is completed, re-set the data logger for the recovery period measurement duration and frequency as specified in the project work plans. Obtain a water level measurement with the electric well tape and record the measurement and time. Shut down the mechanical pump. Record the time that the pump was shut down on the appropriate form. • Continue to measure and record the water level recovery with the pressure transducer/data logger as long as the project work plans require it or until the water level has recovered to 90 percent of the level expected from the pre-test trends. Also, continue to take physical water level measurements periodically during recovery. Once the recovery period ends,take a physical water level measurement at the end of the test. 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.The field data review may also help determine the discharge rate used during the subsequent single or multiple-well-pumping testing. Complete all documentation on the appropriate form as outlined in the project work plans. • Once the step-drawdown test is completed for the well,the equipment may be left in the well for subsequent single or multiple-well pumping testing. If the subsequent testing is not conducted, all downhole equipment may be removed and the wellhead secured. 4.4.2 Single and Multiple-Well Constant Rate Pumping Testing The constant rate pumping test is the most commonly used method for obtaining estimates of aquifer properties. The procedures in this section are written as if a multiple-well pumping test is being conducted. However, these procedures are directly applicable to single-well testing. The only difference is that testing and measuring equipment is installed only in the pumping well, and water level measurements are collected from this well. • Inspect the equipment to be used to ensure that it is in good working order. Equipment used for the pumping testing will vary widely based on site-specific conditions.The project work plans will outline the type of equipment to be used. • M&TE used for field activities will be calibrated by the equipment manufacturer or an approved calibration laboratory using standards that are traceable to the NIST. Certificates of calibration for M&TE will be obtained from the M&TE supplier and kept in the project files. No M&TE will be used without verification of calibration certification. Page 15 of 17