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4 <br />barium during the current report period. The difference column in the following <br />table shows how slight the difference between the barium values is for these <br />wells. <br />Well Barium Value EWI NPL Difference <br />21-4U 5.52 mg/L 5.29 mg/L None 0.23 mg/L <br />21-4U 5.48 mg/L 5.29 mg/L None 0.19 mg/L <br />21-3U 4.82 mg/L None 4.66 mg/L 0.16 mg/L <br />21-3U 5.23 mg/L None 4.66 mg/L 0.57 mg/L <br />21-3U 4.84 mg/L None 4.66 mg/L 0.18 mg/L <br />21-4A 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 />29-3 3.59 mg/L 3.4 mg/L None 0.19 mg/L <br />19-2 2.82 mg/L 2.35 mg/L None 0.47 mg/L <br />19-2 2.70 mg/L 2.35 mg/L None 0.35 mg/L <br />20-9 4.15 mg/L 4.13 mg/L None 0.02 mg/L <br />Phosphorus values in four wells, Well 20-5, Well 21-3A, Well 21-4A, and Well 29- <br />46 all show an elevation in concentration during the current report period. No <br />regulatory standard is established for this constituent however early warning <br />indicators and numeric protective levels have been established to assist with <br />validation of the ground water monitoring program. Observations of these wells <br />will continue on a monthly frequency. <br />Well Phosphorus Value EWI NPL Difference <br />20-5 0.2 mg/L 0.1 mg/L None 0.1 mg/L <br />21-3A 2.9 mg/L None 2.8 mg/L 0.1 mg/L <br />21-3A 3.6 mg/L None 2.8 mg/L 0.8 mg/L <br />21-3A 4.1 mg/L None 2.8 mg/L 1.3 mg/L <br />21-4A 1.13 mg/L 1.1 mg/L None 0.03 mg/L <br />29-413 0.26 mg/L 0.2 mg/L None 0.06 mg/L