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3 <br />Well Boron Value EWI NPL Difference <br />21-4A 4.9 mg/L 4.8 mg/L None 0.10 mg/L <br />_ Well Fluoride Value EWI NPL Difference <br />21-4A 34.6 mg/L 34 mg/L None 0.6 mg/L <br />' Well Chloride Value EWI NPL Difference <br />21-4A 950 mg/L 670 mg/L None 280 mg/L <br />21-4A 680 mg/L 670 mg/L None 10 mg/L <br />Well Barium Value EWI NPL Difference <br />214A 3.59 mg/L 3.29 mg/L None 0.30 mg/L <br />21-4A 3.36 mg/L 3.29 mg/L None 0.07 mg/L <br />' Well Phosphorus Value EWI NPL Difference <br />21-4A 1.13 mg/L 1.1 mg/L None 0.03 mg/L <br />In general the differences are within the same order of magnitude and/or very <br />small. However, because of the number of indicator parameters that flagged <br />above the Early Warning Indicator, this well will continue on a monthly sampling <br />frequency in order to observe any trends. <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, five other wells, Well 21- <br />4U, Well 21-3U, Well 21-4A, Well 29-3 and Well 20-9, also indicated elevated