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3 <br />^ In one instance, Well 19-2, dissolved barium levels are elevated with no <br />corresponding increases in any of the other indicator constituents. It is highly <br />likely that this trend results from leaching of barium from the materials that were <br />' used to plug off the well when it ignited during coring due to high methane in the <br />formation. When several purge volumes are extracted from this well using the <br />' micro purge equipment the barium levels begin to drop. <br />In addition to the elevated barium levels in Well 19-2, three other wells, Well 21- <br />4U, Well 21-3U, and We1121-4A also indicated elevated barium during the <br />current report period. The difference column in the following table shows how <br />slight the difference between the values is for these wells. <br />' Well Barium Value EWI NPL Difference <br />' 21-4U 5.49 mg/L 5.29 mg/L None 0.2 mg/L <br />21-3U 4.86 mg/L None 4.66 mg/L 0.2 mg/L <br />' 21-3U 4.84 mg/L None 4.66 mg/L 0.18 mg/L <br />21-4A 3.38 mg/L 3.29 mg/L None 0.09 mg/L <br />' 19-2 2.87 mg/L 2.35 mg/L None 0.52 mg/L <br />19-2 3.41 mg/L 2.35 mg/L None 1.06 mg/L <br />Boron is elevated in five wells including Well 21-3U, Well 21-3A, 21~A, 29-3 and <br />' 29-48 during the report period. The charts for this constituent at these sampling <br />points indicate generally less than 1 mg/L elevation above the EWI or NPL. <br />Boron Value EVUI NPL Difference <br />21-3U 3.4 mg/L None 3.12 mg/L 0.28 mg/L <br />~1-3A 5.4 mg/L None 4.4 mg/L 1.00 mg/L <br />21-4A 5.1 mg/L 4.8 mg/L None 0.30 mg/L <br />29-3 5.1 mg/L 4.8 mg/L None 0.30 mg/L <br />29-4B 1.21 mg/L 1,01 mg/L None 0.20 mg/L <br />