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Centennial Project - Section 33 Pumping Test Plan 6 <br />September 2009 Powertech (USA) Inc. <br />be instrumented with level Trolls@ and monitored for changes in water levels. The two <br />• remaining wells completed in the A2 Sand will be hand tagged. <br />Summary <br />It is important to note that in the layout of the test, the monitoring wells configuration <br />provides both east-west and north-south coverage in order to determine potentiometric <br />elevations for the different units, and the regional hydraulic gradients in the Laramie <br />Formation, A2 Sand, and B Sand. This is a critical component of the pumping test <br />design, given that the confining zones between the A2 and WE Sands, and between the <br />WE Sand and underlying B Sand are locally one foot or less. <br />Also shown on Figure 4 is the location of a proposed core hole (IN-14-33), which is to <br />be cored for the full depth through Laramie into the B Sand. This core hole will be <br />plugged and abandoned. <br />The construction detail for a typical production well or monitoring well installation is <br />shown on Figure 5. <br />5.0 TESTING EQUIPMENT and DESIGN <br />The pump test will be performed using an electrical submersible pump set at an <br />approximate depth of 550 feet. <br />• Prior to starting the primary test, a step-rate test will be conducted. Based on the <br />results from this test, the optimum pumping rate and duration of the test will be <br />determined. <br />During both the step-rate and constant-rates tests, water levels in all observation wells <br />will be measured and recorded with integrated level TROLL@ transducer/datalogger <br />units manufactured by In-Situ, Inc. The automated equipment will be programmed prior <br />to the test with an initial reference level (depth to water). Water levels will be recorded <br />according to a pre-determined time schedule. <br />The pressure rating for the transducers/TROLLs® will range from 10 to 100 psi, as <br />warranted, for each monitoring location. Vented cables will be used to minimize the <br />impact of barometric fluctuations. Barometric pressure also will be recorded throughout <br />the testing period. <br />6.0 TESTING and ANALYTICAL PROCEDURES <br />Prior to the pumping period, the testing equipment will be installed and checked for <br />proper operation. To assess potential background trends in groundwater levels, <br />baseline level information will be collected during a 72- to 96-hour period prior to the <br />conduct of the pumping test. <br />E <br />f?!f <br />A