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4 <br />Fluoride values in Well 21-3U, Well 21-4A ,Well 21-46, and Well 20-9 exceed <br />the established EWI or NPL during the reporting period. With the exception of <br />Well 20-9 these fluoride values are only slightly elevated. The fluoride value of <br />' 48 mg/L at Well 20-9 in December 2002 is 14 mg/L greater than the 34 mg/L <br />EWI. <br />Weli Fluoride Value EWI NPL Difference <br />21-3U 26.5 mg/L None 25 mg/L 1.5 mg/L <br />21-4A 34.2 mg/L 34 mg1L None 0.2 mgiL <br />21-46 40 mg/L 39.7 mg/L None 0.3 mglL <br />20-9 48 mg/L 34 mg/L None 14 mg/L <br />Phosphorus values in four wells, Well 21-3A, Well 21-4A, Well 29-3, and Well <br />20-9 all show a slight elevation in concentration during the current report period. <br />No 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 />21-3A 4.2 mg/L None 2.8 mg/L 1.40 mg/L <br />21-3A 3.95 mg/L None 2.8 mg/L 1.15 mg/L <br />21-4A 1.2 mg/L 1.1 mg/L None 0.10 mg/L <br />21-4A 1.31 mg/L 1.1 mg/L None 0.21 mg/L <br />21-4A 1.2 mg/L 1.1 mg/L None 0.10 mg/L <br />29-3 1.31 mg/L 1.23 mg/L None 0.08 mg/L <br />29-3 1.31 mg/L 1.23 mg/L None 0.08 mg/L <br />20-9 0.27 mglL 0.25 mglL None 0.02 mg/L <br />