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4 <br />completion tubing strings following routine sampling. Although all are protected <br />with individual coverings to prevent cross contamination of the strings, it is <br />possible that some of the more dense dissolution surface water entered the <br />tubing string of the A Groove completion. Although the water quality data has <br />never indicated a mixing of the two water types in the well casing, Well 21-3A <br />was pumped out shortly after the overflow and water level change were <br />observed. Several casing volumes were removed. The water level is very slowly <br />returning to the elevation where it was prior to the water elevation change. The <br />individual coverings on multiple completion wells inside the casing head were <br />also reinforced to add extra protection. No changes were observed in the other <br />completions within well 21-3. <br />