HYDROLOGY - 9/4/2009, 7:15:47 AM-JWD

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Centennial Project - Section 33 Pumping Test Plan 5 September 2009 Powertech (USA) Inc. monitoring wells will be completed in the overlying Laramie Formation (MO1, M02,and . M03), five monitoring wells will be completed in the production zone (MM1, MM2, MM3, MM4, and MM5), one monitoring well will be completed in the underlying WE Sand (MU1), and three monitoring wells will be completed in the underlying B Sands (MUU1, MUU2, and MUU3). As shown, monitoring wells will be located spatially in order to define the regional potentiometric gradients in the Laramie Formation, A2 Sand, and in the underlying B Sand. The proposed completion zone, coordinates, and projected depth for the pumping well and each of the monitoring wells are listed in Table 1. Drilling & Well Completion At the pumping well and each monitoring well location, a pilot hole will be drilled to the projected total depth and logged geophysically including gamma, single point resistivity, spontaneous potential, and deviation. Based on the geophysical logs, the completion interval and screen length will be determined on a well-specific basis. Based on existing logs for the pumping test area, it is anticipated that the screen length in most wells will be about 20 feet. The position and length of the completion interval (i.e., sand pack) will also be determined on well-specific basis. It is anticipated that the pumping and monitoring wells will be fully penetrating and completed across the full sand intervals selected in the Laramie, A2, and WE, though the B Sand may be partially penetrated due to its large thickness. • The construction detail for a typical production or monitoring well installation is shown on Figure 5. Survey Following completion, the pumping well and each of the monitoring wells will be surveyed with respect to ground surface and top of casing elevation (i.e., measurement point) and X-Y coordinates. Previous Section 33 Pumping Tests Powertech previously completed pumping tests in October 2007 and in February 2008 at a location approximately 400 feet south of the planned Section 33 pumping test. The locations of the pumping well and the monitoring wells installed for and used in these tests are shown on Figure 4. The pumping well (IS-003T) and two monitoring wells (IS- 003Tc and IS-003Td) are completed in the A2 Sand. Monitoring well IS-003Ta is completed in the overlying Laramie Formation and monitoring well IS-003Tb is completed in the underlying WE Sand. During the planned Section 33 pumping test, the pumping well and the monitoring wells completed in the Laramie and underlying WE Sand and used in the previous tests will b-A& !?°