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Letter to Richard Blubaugh 2 - December 2, 2009 <br />Centennial Project 2nd Review of MD -03 File No. P- 2008 -043 <br />c. How will the tanks be decontaminated if radon levels are determined to be unacceptably high, and <br />what will decontamination cost? How will decontamination fluids and equipment be disposed of, and <br />what will their disposal cost? <br />3. If Powertech wants the latitude to conduct the proposed pump test during the months when hard freezing <br />temperatures at the test location are possible, then a cold weather plan, including costs, must be provided for <br />DRMS review and approval. The plan must address what measures and what equipment will be employed to <br />keep the water from freezing both to prevent damage to tanks, pipes, and fittings, and to allow for timely re- <br />injection of n t, mn test water. If tank heaters or other power consumptive measures or equipment are to be <br />employed for freeze prevention, provide a specification for generator(s) that will be required, both to conduct <br />the pump test and to operate freeze prevention equipment; this is needed for DRMS to estimate power <br />generation costs to establish the amount of required bond. <br />4. Provide a detailed lithological description of the core from hole IN- 14 -33. This is needed for DRMS to <br />review, the aquifer /aquitard relationships described and illustrated in MD -03 submittals. <br />5. Powertech's October 28, 2009 submittal commits to injection under a vacuum. As discussed in the DRMS <br />review letter dated September 25, 2009, this commitment essentially eliminates the potential for injected <br />fluid to migrate into strata other than those where migration currently occurs under existing conditions. <br />However, there are various descriptions in the underground injection control literature of injection under a <br />vacuum. Therefore, Powertech must provide a detailed description of how injection under a vacuum will be <br />conducted at this site, including monitoring and measures to be taken to assure that pressurization is <br />prevented throughout the re- injection process. <br />6. If and when MD -03 is approved, DRMS will review the Powertech field notes for all post -June, 2008 well <br />sampling conducted in section 33, where the proposed pump test is to occur. DRMS will contact Powertech <br />to coordinate the review at the appropriate time. <br />DRMS is deferring the cost estimating to determine the amount of required bond for the proposed <br />modification until the issues in this review letter have been resolved. You may not commence operations <br />proposed in MD -03 until these issues have been resolved and bond has been submitted and you have been <br />notified in writing that the bond has been accepted by the DRMS. <br />If you have any questions, please contact me at 303 - 866 -3567, ext. 8143. <br />/ <br />l <br />Allen C. Sorenson <br />Reclamation Specialist <br />cc: Michael Beshore, Powertech, via email <br />Oacs files\My Documents 4 -19 -06 thru \centennial 2" review of modification md3 p2008043.doc <br />