Laserfiche WebLink
5 <br />Response to DRMS September 25, 2009 Letter Powertech (USA) Inc. <br />• 12. It is necessary to determine if there are any wells or bore holes within the <br />potential zone of flow for the injectate and the status condition of those wells or <br />bore holes. Powertech must provide a report that includes the following: <br />a. A technical analysis delineating the potential zone of flow for injectate. <br />b. A map illustrating all wells and boreholes within the potential zone of flow, <br />a discussion of the sources of information for the wells and bore holes, <br />and a description of the efforts put forth to assure that all wells and bore <br />holes within the zone have been identified. <br />C. A description of the status condition of each well and bore hole including <br />the sources of information for and investigations conducted to determine <br />the status conditions. <br />d. For any wells or bore holes that are identified as being potential flow <br />pathways for injectate or that cannot be ruled out as potential flow <br />pathways, provide a plan to prevent injectate from traveling along these <br />pathways and entering strata other than the A2 Sand. <br />Response: <br />As noted, Powertech is proposing to reinject the produced fluids from the Section <br />33 pumping test under vacuum into the same well from which it was produced. <br />a. Regarding the potential zone of flow for injectate, based on the best <br />estimate of aquifer properties for the A2 Sand, it is proposed that during <br />the planned pumping test, PW-1 will be pumped at a constant rate of <br />approximately 10 gallons per minute for 72 hours, producing in aggregate <br />43,200 gals. Assuming "piston-like" displacement, the radius of fluid <br />displacement around the injection well for different effective porosities and <br />for assumed aquifer thicknesses (b) of 10 and 20 feet is summarized in <br />the following table. As shown, in the most conservative (worst) case, the <br />radius of fluid displacement would be less than 50 feet. The closest <br />residential well is located more than 3,800 feet from the pumping/injection <br />well PW-1. <br /> Radius of Fluid Displ cement <br />Effective <br />Porosity Aquifer Volume (cubic <br />feet b = 10 feet B = 20 feet <br />10% 57,750 42.9 30.3 <br />15% 38,500 35.0 24.8 <br />20% 28,875 30.3 21.3 <br />125% 23,100 27.1 19.2 <br />The actual thickness of the A2 Sand in the A2 monitoring wells ranges from <br />23.5 to 30 feet. <br />ARMAMOAMN*