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AGAPITO ASSOCIATES, INC. <br />CONSULTING ENGINEERS <br />715 t~ORIZON DRIVE <br />SUITE 340 <br />GRAND JUNCTION, CO B1S06 <br />USA <br />VOICE 970.242.4220 <br />WWW.AGAPITO.COM <br />December 19, 2006 <br />Ms. Cindy Byrn <br />Natural Soda, Inc. <br />P. O. Drawer 72 <br />Rifle, CO 81650 <br />RE: 3M-TDR Cable Readings-December 12, 2006 <br />Dear Ms. Byrn: <br />CHICAGO OFFICE <br />630.792.1520 <br />GOLDEN OFFICE <br />3Q3.273,1511 <br />134-25 <br />Attached is a summary of the data obtaiTed on December 12, 2006, for Cables #2 (Kyle) <br />and #3 (Matt) from the 3M-TDR installation. Utilizing a CSI TDR 100, readings were obtained <br />from two of the 5/8-inch TDR cables. No readings were taken from Cables #1 (Blank) and #4 <br />(Kyle2) because they were considered damaged during the March 9, 2005, readings. A <br />propagation velocity (vy) of 0.87 was utilized and 2,048 data points were collected from each <br />cable length. A waveform average of 64 was used to eliminate background noise. <br />Comparison of previous readings (taken on March 9, 2005) with the 2006 readings for <br />Cable #3 (Figure 1) show no ground movement. However, there appears to be a change in the <br />reflection coefficient towards the end of the cable for Cable #2 (Figure 2). It may be due to the <br />intrusion of water or mechanical damage to the cable between 1,500 and 1,560 ft. <br />Thank you for the opportunity to work with you on this project. Please call me if you <br />have any questions, comments, or concerns. <br />Yours sincerely, <br />r-, <br />Albert Adu-Acheampong <br />Project Engineer <br />AAA/smvf <br />Attachments(2): Figures 1 and 2 <br />G EO ENGINE ERING • MINING ENGINEERING • CIVIL ENGINEERING <br />