REVISION - 9/4/2009, 7:35:25 AM-JWD

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A. Sorenson, DRMS NO1 Modification - Pump Test August 2, 2009 2 It is understood by Powertech that both the EPA and DRMS ensures the protection of groundwater resources in the State of Colorado. And although injection of the pump test water will occur within the same confined aquifer from which it is extracted, and most likely the same well from which it is extracted, additional measures will be utilized to ensure injectate will be controlled. Powertech has agreed to provide the EPA with the results of mechanical integrity testing (MIT) of the injection well. At a minimum, MIT will be conducted on the injection well casing at a pressure of 125% of the operating pressure for 10 minutes. If the pressure-bleed off is less than 10% over the 10 minutes, that will constitute a passing mechanical integrity test of the PVC casing. Additionally, an electrical resistivity log will be performed on the injection well to further ensure integrity of the casing as well as the cement within the annular space of the well bore. Well completion records documenting the use of cement grout from the screened interval to the ground surface will also be available. This completion procedure is in excess of the State Engineers Office (SEO) standards for well completion (Water Well Construction Rules in 2 CCR 402-2). Powertech will provide the information requested by the UIC Class V Permit to the EPA to ensure protection of groundwater resources. This information can also be made available to the DRMS, upon request, prior to beginning injection of the pump test water. Attachments have been included in this report to assist the DRMS in their reclamation and surety bond calculations. Attachment A shows the GPS coordinates of infrastructure to be utilized during the aquifer pumping test. Attachment B includes information illustrating the total amount of surface disturbance to potentially take place during the proposed prospecting activity, as well as photographs of infrastructure locations and native vegetation communities. As can be seen from Attachment B, the total potential surface disturbance for this activity is about one-quarter of an acre (0.24 acres), most of which will potentially occur from the staging of the mobile Baker tanks. Although the fenced perimeter will enclose an area of about 0.45 acres (Refer to Figure 4 of Appendix 1), much of this area will not be disturbed during the pump test, and is actually bonded for surface reclamation under the P-2008-043 Modification #1 to construct monitoring wells. Attachment C includes actual 2009 costs to conduct hydro-seed reclamation at prospecting sites located throughout the Centennial Project area, and those costs per acre of hydro-seed reclamation will be very similar for this prospecting effort. Please find the enclosed confidential and public DRMS application forms and attachments for the NO1 modification, along with a check for the $86.00 application fee. Powertech is hereby requesting that the DRMS review and approve the NOI modifications to file number P-2008-043. Below is a list of attachments and appendices to aid the DRMS in their review. Attachments: • Attachment A-Tabulated location information of infrastructure to be utilized during aquifer testing. • Attachment B - Photographs and disturbance details of locations to be utilized for infrastructure staging. • Attachment C - Actual costs to Powertech for recent vegetation reclamation activities. Appendices: • Appendix 1- Centennial Project Section 33 Aquifer Pumping Test Plan. • Appendix 2 -EPA UIC Draft Permit No. C051237-08412