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' ~/~©r~: <br />AMER~IICAN <br />SODA, L.L.P. <br />2717 County Road 215 <br />Parachute, CO 61635 <br />III IIIIIIIIIIIIlIII <br />Kurt Nielsen <br />General Manager <br />Doc , j~f0.-w~~ : J~as.e l ~'rre. wat ~- <br />C-1^ara.c~'F.ri xF.-t~en ReprTrt; -~-1- 9°I <br />~Ctt~od L~- 1n-31-9°i <br />Thursday, Maroh~2, 2000 <br />Allen Sorenson and Harry Posey <br />T0: Division of Minerals and Geology <br />T3'f33herman oom 'f5- <br />Denuer, CO 80203 <br />Dear Allen and Harry: <br />Telephone (970J 265-6500 <br />/ ) Facsimile (970] 26x6393 <br />Qv~l r~L`/ <br />RECEIVED <br />MAR 0 3 2000 / <br />Division of Minerab & Geology <br />Enclosed you will find 3 copies of the Yankee Gulch Sodium Minerals Project (Permit File Number M-99- <br />002] Ground Water Monitoring Report for the period July 1, 1999 through October 31, 1999. This <br />document summarizes baseline ground water monitoring data and well drilling and completion <br />information in relation to the ground water monitoring network at the Yankee Gulch Site as described in <br />the Ground Water, Surfiace Water, and Process Monitoring Plan for the Yankee Gulch Sodium Minerals <br />Project. The report is also being distributed to John Melhoff of the Bureau of Land Management Office in <br />Meeker and Robert Becker of the Environmental Protection Agency Region VIII office in Denver. <br />In your inspection report (Dctober 20, 1999] you requested that American Soda provide a comparison of <br />wells where grout contamination is suspected with results from other wells completed in the same <br />stratigraphic horizon. Attached is a table summarizingg the mean values of wells completed in the A <br />Groove. Grout contamination is suspected at Well 20-4A due to the recompletion perforation of this well <br />and the elevated pH in the samples. A higher pH could result in lower dissolved metals due to <br />precipitation of the metals. ARhough the metals concentrations are typically lower in this well, there is <br />also a correspondingg relationship to the dissolved solids that may have a greater influence at this point <br />than the elevated pH. American Soda has implemented a procedure requirvng the removal of additional <br />purge volumes from this well prior to sampling. <br />No other well, including well 29~U, shows a likelihood of grout contamination as represented by the pH <br />values and completion data. Inspection of the completion reports for well 29-4U indicates the use of <br />Aguaguard Grout rather than cement. According to the manufacture's material spec'rfications <br />information, the leachate pH of Aquaguard Grout is 7.0 to 8.0. The pH values of well 29~U have <br />decreased from their initial levels and now appear to be stabilized in a range more representative of the <br />natural formation water. <br />Should you have any questions regarding this report, please contact me at (970] 285-6500 or Ed Cooley <br />at (970] 285-0407. <br />Since <br />urt Neil en <br />General Manager <br />Natural Sodium Products For A Cleaner Environment <br />