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SOP-012 Standard Operating Procedure Aquifer Testing Page 12 of 18 REVISION NO. 0 March 2020 Sharpe Army Depot pumping test utilizes a single well (the pumped well) and a mechanical pump to remove water at a constant rate from the water-bearing unit. The same well is used to measure water level drawdown and recovery in the formation. The multiple-well test utilizes one or more observation wells at selected distances and locations relative to the pumping well. Water levels are monitored in the pumping and observation wells throughout the duration of the test. The remaining discussion provides the requirements and procedures for step-drawdown tests and single- and multiple-well constant rate pumping tests. These represent minimum requirements as site- and project-specific information, and criteria must be incorporated in planning and conducting pumping tests. The project work plans will provide the necessary additional requirements and procedures for the specific pumping tests to be conducted. The procedures below describe the use of pressure transducers and data loggers to monitor water levels during the pumping testing. However, other water level measurement techniques may be substituted, and the procedures may be modified as appropriate in the project work plans. 3.4.1 Step-Drawdown Testing Step-drawdown testing should be conducted before other pumping tests are performed. All newly installed wells should be developed before conducting step-drawdown tests. • Inspect the equipment to be used to ensure that it is in good working order. Equipment used for the step-drawdown testing will vary widely based upon site-specific conditions. The project work plans will outline the type of equipment to be used. • Measuring and test equipment (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 National Institute of Standards and Technology (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 utilized without verification of calibration certification. • Decontaminate all downhole equipment according to SOP No. 003. • Visually inspect and access the well per SOP No. 008. • Obtain a depth to water level measurement and sound the bottom of the well with the electric tape according to the procedures outlined in SOP No.008. Compare the measured total depth to the bottom of the well to the well construction diagram to determine if sediment is at the bottom of the well.