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Christy Woodward <br />September 17, 2008 <br />Page 15 <br />¦ Evaluation of measured changes in oxidation-reduction potential and constituent solubility <br />associated with underground mine workings, and the persistence of these changes in <br />down-gradient groundwater. <br />Report Preparation <br />The results of this work plan will be presented in a report, which will be prepared as a stand- <br />alone document suitable for submittal to DBMS as stipulated in Denison's March 31, 2008 <br />letter. Formatting of the report will also consider requirements for,a:potential future EPP to <br />facilitate efficient incorporation of groundwater data into an EPP if it is deemed necessary by <br />Denison. <br />References <br />Colorado Division of Reclamation Mining and Safety (DBMS). 2008a. Notices of Determination <br />of Designation Mining Operation (DMO). February 8. <br />DRMS. 2008b. Division Response to Operator's Memo (Draft dated March 31, 2008) Concerning a <br />Proposed Program for Designated Mining Operation (DMO) Environmental <br />Analysis, at the Sunday Mine Complex and Van 4 Mine. May 9. <br />DRMS. 2008c. New Requirements - Designated Alining Operations (DMO) Status - Implementation <br />of HB 1161. June 6. <br />Denison Mines (USA) Corp. (Denison). 2008. Memorandum in Response to Notice of <br />Determination of Designated Mining Operation (DMO, DRMS File Numbers <br />M-1977-416, M-1978-039 HR M4977-285, M-1980-055 HR, M-1981-021 <br />and M4977-032):, March 31. <br />Domenico, P.A. and Schwartz, F. G V. 1990. Physical and Chemical Hydrogeology. John Wiley & <br />Sons, Inc. publisher. <br />Tables <br />Table 1 Summary of Monitoring Well Installation and Data Collection Activities <br />Table 2 Groundwater Sample Collection and Analysis Information <br />Table 3 CDPHE Regulation Number 41- The Basic Standards for Groundwater <br />Figures <br />Figure 1 Location of Groundwater within Underground Workings, May 15, 2008 <br />Figure 2 Interpretive Cross-Section Showing Mine Area <br />Figure 3 Interpretive Cross-Section Showing Gypsum Valley Area <br />Figure 4 Proposed Monitoring Well Locations - West Sunday Mine