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Stantec <br /> 2010 TIDEWATER STOCKTON WORK PLAN <br /> 3.3.3 Task 3— Recovery Well Aquifer Test— Groundwater Extraction <br /> 3.3.3.1 Groundwater Extraction Configuration <br /> Submersible pneumatic pumps will be employed to extract groundwater from the GWE wells <br /> concurrently. The planned test equipment configuration will consist of: <br /> • Two QED APT-4 low drawdown pneumatic submersible pumps (the groundwater <br /> extraction pumps) or equivalent installed with the pump inlet installed at approximately <br /> 16 feet bgs; <br /> • A compressor to run the submersible pumps; <br /> • A bag filter for each submersible pump; <br /> • A flow totalizer for each submersible pump; <br /> • An approximately 18,000 gallon plus storage tank with secondary containment; and <br /> • Miscellaneous fittings, meters, and equipment. <br /> 3.3.3.2 GWE Continuous Operation <br /> The GWE equipment will operate continuously for at least 36 hours but not longer than 72 hours <br /> on the GWE wells. The following data will be recorded approximately every two hours (except at <br /> night) thereafter as appropriate for each GWE well: <br /> 1. Groundwater elevations will be measured in the test wells at appropriate intervals <br /> after the equipment is shut down following the test until approximately 95% <br /> recovery has been met; <br /> 2. Time; <br /> 3. Groundwater levels in observation wells; <br /> 4. Total groundwater flow rate; <br /> 5. Groundwater elevations will be measured in the test wells after the equipment is <br /> shutdown at the end of the test. <br /> Groundwater samples will be sampled once at the end of the test from each extraction well (see <br /> Task 4). <br /> Once the GWE operations are completed, the GWE equipment will be decontaminated, <br /> dismantled, and secured as needed. All groundwater monitoring wells and test wells will be <br /> secured and the site returned to pre-test conditions. <br /> 3.13 <br />