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Additionally, Powertech will monitor the long range forecast before beginning the aquifer pump test. If <br />temperatures are expected to be abnormally low during pumping or re-injection activities, the pump <br />test will be rescheduled to when the long-range forecast predicts more moderate temperature <br />extremes. <br />DRMS Item #4) Provide a detailed lithological description of the core from hole IN-14-33. This is <br />needed for DRMS to review the aquifer/aquitard relationships described and illustrated in MD-03 <br />submittals. <br />Powertech Response to DRMS Item #4: <br />In order to assist the DRMS in its review of the aquifer/aquitard relationships described in MD-03 <br />submittals, Powertech has included lithology field notes prepared during the advancement of <br />exploration borehole IN-14-33 as well as a generalized geologic cross section through the area of the <br />pump test location. The detailed lithologic field description of the IN-14-33 exploration borehole and <br />core is included as Attachment C. The IN-14-33 borehole was advanced to 369.5 feet during which drill <br />cuttings were obtained and logged, and then core was recovered (or attempted recovery) from 369.5 <br />feet to the total depth of the hole. <br />The generalized geologic cross section along with a description of the creation of the geologic cross <br />section, and the data used, is included as Attachment D. <br />DRMS Item #5) Powertech's October 28, 2009 submittal commits to injection under a vacuum. As <br />discussed in the DRMS review letter dated September 25, 2009, this commitment essentially <br />eliminates the potential for injected fluid to migrate into strata other than those where migration <br />currently occurs under existing conditions. However, there are various descriptions in the <br />underground injection control literature of injection under a vacuum. Therefore, Powertech must <br />provide a detailed description of how injection under a vacuum will be conducted at this site, including <br />monitoring and measures to be taken to assure that pressurization is prevented throughout the re- <br />injection process. <br />Powertech Response to DRMS Item #5: <br />Powertech has decided to commit to having personnel onsite throughout the entire pump test water re- <br />injection process, to ensure that all equipment and safeguards operate properly. Injection pressure will <br />be monitored and logged throughout the duration of re-injection by the use of a pressure gauge or <br />recorder attached to the sealed wellhead flange, which will measure pressure within the injection well <br />casing. <br />In order to ensure re-injection under a vacuum, the well casing will be sealed from the atmosphere by <br />the wellhead flange. Produced water will then be pumped from the storage tanks to the wellhead and <br />allowed descend into the empty casing of the well, creating a negative pressure, or vacuum, relative to <br />atmospheric pressure. Pressure at the wellhead will be monitored and logged, and if at any point the <br />pressure gauge approaches positive atmospheric pressure, the water flow rate from the tanks will be