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SOP NUMBER 0.0 <br />remainder of the test. Measurements will be recorded on the Aquifer Test Data Form <br />(Appendix 1) and in the field notebook. <br />2.4 Investigation - Derived Waste (Withdrawn Groundwater) <br />Withdrawn groundwater will be collected and transferred to the tailings pond area. <br />Page 4 of 9 <br />Pump Testing <br />• If water quality parameters for withdrawn groundwater are required, it is suggested that <br />withdrawn groundwater samples be collected every 2 hours and water quality parameters <br />measured. <br />• .Maintain fuel in the generator to ensure the generator does not fail during testing. All refuel <br />times will be noted in field notebook. <br />o During pumping, plot the data (time versus drawdown) on semilog graph paper or with <br />computer software to assess the progress of the test and to determine when sufficient data <br />have been collected and the test can be terminated. <br />The objective of real -tine data analysis is to assess the progress of the test and to determine <br />when the pumping test can be terminated. There is generally no need to continue a test if water <br />levels have sufficiently stabilized. When the time versus drawdown data for the most distant <br />observation well begins to plot as a straight line (constant slope) on the semilog graph paper, the <br />test can be terminated unless delayed yield and /or boundary conditions are anticipated. However, <br />the test should run for a minimum of 24 hours before being tenninated. <br />Recovery Test — When the constant -rate test is terminated, the data logger cycle will be <br />terminated and started again to record recovery data. The data logger will be programmed to <br />collect recovery data in a logarithmic mode at the same intervals as those used for the constant - <br />rate test. The start of data recording will be timed precisely to the. shut down of the generator and <br />pump. The pump will be equipped with a check valve to prevent water in the discharge pipe <br />from reentering the well once pumping ceases. <br />The recovery test will be terminated when water levels in the observation wells have recovered to <br />within 90 percent of pre -test static levels. Recorded data will be downloaded from the data <br />logger to a computer disk with file names that reflect the well name and test type (step - discharge, <br />constant-rate, or recovery). Backup disks will also be created for contingency purposes. <br />3.0 DATA ANALYSIS <br />Data analyses and interpretations from the pumping tests will be included in the report. <br />Drawdown and recovery data will be compiled and analyzed to estimate: <br />• Hydraulic conductivity, transmissivity, and specific yield or storativity; <br />o Estimate the radius of influence; <br />o Assess whether any hydrogeologic boundaries were encountered (i.e., faults or recharge <br />boundaries); and <br />o Assess whether any hydraulic communication between aquifer units exists. <br />0 -4 <br />