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Mr. Allen Sorenson Page 3 of 3 February 9, 2~1 Dissolution Surface Conductivity, Temperature, and Pressure Probes At this time American Soda continues to collect monthly samples from two of the three dissolution surface wells (Well 29-4D and Well 21-3D). The conductivity, temperature, and pressure probes installed in two of the dissolution surface wells (29~1D and 21~DX) have now both been removed due to failure and equipment malfunction. Manual water level measurements for all dissolution surface wells are collected three times per week. Two of the dissolution surface wells have continually been sampled (21-3D using a dedicated pump and 29- 4D using a bailer] and the third will be re-added to the sampling list (21-4DX by bailer] now that the malfunctioning probe has successfully been removed from the casing. American Soda is working with the Scotland manufacturer of the specialized probes to resolve the complications experienced with the probes we have already attempted to use in the wells. In the interim, we have ordered data logger probes from an American manufacture that are designed to monitor the pressure at the water surface. The complications of small well diameter, high conductivity levels, extensive depth and remote location have all been significant factors in the continued failure of the specialized probes. American Soda's current goal regarding these probes is to install a less involved design that excludes the ability to monitor conductivity. The Scotland manufacturer is preparing one probe for our trial use with a slightly different design to monitor only temperature and pressure at depth. The success or failure of this design will indicate our next step. Should you have any questions or comments regarding this information, please contact me at (970] - 285-0406. Sincerely, ~~ ~~ Celina Akin Environmental Engineer CMA/cma Enclosures