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P a w a Peabody Western Paradox Hydrology System Water Quality Statistics Sample Point: NPDESB Location: Elevation: 7015.00 Uncensored Data Censored Data No. of No. of Obs Mean St.Dv. Min Max Obs Min Max Laboratory Parameters Sulfate MG/L 28 1070 .11 584.59 171 .00 1910.00 Sulfide MG/L B -19 .37 ,02 1.10 19 < .O1 < 1.00 Blca rbonate As IIco3 MG/I. 28 271 .46 97.65 59 .00 937.00 Carbonate As Co3 MG/L 22 2 .41 4.43 0 .00 14.00 6 < 2 .00 < 2.00 Hydroxide As Oh MG/L 1 0 .00 0 .00 0.00 6 < 2 .00 < 2.00 Nitrate As No3 MG/L 1 2 .U0 2 .00 2.00 Phosphate As Po9 MG/L 4 .OB .09 .03 .1D 23 < .02 < .10 Ca tion_Anion Balance PERCENT 26 - .36 2.57 - 9 .40 5.53 Sar RATIO 2B .38 .16 .20 1.02 Solids, Diss. (Ca lc) MG/L 7.8 1665 .61 758.63 991 .00 2760.00 Sum Of Anions MEQ/L 5 93 .58 1.38 41 .30 94.90 Sum Of Cations MEQ/L 5 91 .88 1.86 40 .20 99.80 Aluminum, Total Rec. MG/L 14 .19 .12 .OS .51 19 < .OS < .20 Arsenic, Total Rec. UG/L 14 1 .57 .65 1 .00 3.00 14 < 1 .00 < 1.00 Barium, Total Rec. UG/L 26 32 .19 22.34 0 .00 80.00 2 < ]0 .00 < 20.00 Cadmium, Total Rec. UG/L 9 2 .20 2.20 .30 5.00 23 < .10 < 5.00 Chromium, Total Rec. UG/L 1 20 .00 20 .00 20.00 28 < 1 .00 < 50.00 Copper, Total Rec. UG/L 1 20 .00 20 .00 20_DO 28 < 1 .00 < 50.00 Iron, Total Rec. MG/L 94 .19 .09 .02 .38 11 < .02 < .03 Lead, Total Rec. UG/L 3 14 .00 22.52 1 .00 40.00 29 < 1 .00 < 20.00 Manganese, Total Rec. MG/L 3 .13 .12 .OS .27 Mercury, Total Rec. UG/L 1 .10 .10 .10 27 < .10 < .20 Molybdenum, Total Rec. UG/L 9 1 .89 .78 1 .00 3.00 19 c 1 .00 < SD.DO Nickel, Total Rec. UG/L 2 25 .00 7.07 20 .00 30.00 26 < 10 .00 < 50.00 Selenium, Total Rec. UG/L 19 3 .86 3.92 1 .00 15.00 19 < 1 .00 < 10.00 Silver, Total Rec. UG/L 1 .60 .60 .60 26 < .10 < 10.00 Zinc, Total Rec. MG/1., 18 .02 .02 .O1 .06 10 < .O1 < .OS Tds Ratio ANAL/CALL 22 1 .06 .OS .99 1.17 Conditions Specified: From 1/01/80 To 12/31/96...NPDS...Area=II •