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Shale Country Surveying <br />Midford L. Coolbaugh P.L.S. 10871 <br />215 Hutton Avenue, Rifle, Colorado 81650 <br />Ph: (970) 625-3977 <br />Fx; (970) 625-0403 <br />October 2, 2006 <br />Cindi Hyrns, Technical Manager <br />Natural Soda Inc. <br />3200 RBC Road #31 <br />Rifle, CO 81650 <br />Dear Cindi, <br />Snbsidence monitoring elevations: 2006 survey, along with previous data. for comparison. <br />Year 1-Center 2-N®rffi 3-Fast 4-South 5-West 6 7 8 9 10 <br />1990 6655,420 6635.550 6665.870 6680.310 6665.940 - - - - - <br />]991 6655.420 6635.550 6665.860 6680300 6665.940 - - - - - <br />1992 6655.430 6635.550 6665.860 6680.310 6665.920 - - - - - <br />1993 6655.440 6635.560 6665.850. 6680.340 6665.950 - - - - - <br />1994 6655.470 6635.550 6665.890 6680.380 6666.010 - - - - - <br />1995 6655.4A0 6635.550 6665.910 6680.370 6665.980 - - - - - <br />1996 6655,410 6635.550 6665.960 6680.380 6665.960 - 6702.920 - - - <br />1997 6655.400 6635.540 6665.910 6680.350 6665.94D - 6702.860 - - - <br />1948 6655.336 6635.482 6665.886 6680.254 6665.955 6679.340 6702.797 - - - <br />1999 6655.376 6635.508 6665.902 6680.272 6665.973 6679.367 6702.918 - - - <br />2000 6655.361 6635.477 6665.860 6680.352 6665.973 6679.376 6702.917 - - - <br />2001 6655.390 6635.520 6665.930 6680.325 6665,910 6679.320 6702.895 - - - <br />2C02 6655.440 6635,560 6666.070 6680.360 6665.960 6679.310 6702.960 6688.180 6672.920 6683.930 <br />2004 6655.410 6635.550 6665.930 6680.290 6665.920 6679.320 6702.830 6688.140 6672.870 6683.850 <br />2006 6655.370 6635.550 6666.030 6680.250 6665.880 6679.240 6702.880 6688.100 6672.840 6683.850 <br />These 2006 results again fall witltin the 1 cnr. precision limit of my Leica GPS System, and do not show any subsidence. Nor were <br />any surface craclang or other signs of subsidence visible on the surface. <br />Also, please find herewith a list of latitudes and longitudes of the IO subsidence monuments. <br />If I can be of any further help, please let me lmow. <br />Yours sincerely, <br />~dford L. Coolbaugh, P.L.S. <br />MI,C/jac <br />Natsoda100206.doc <br />