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• • <br />DESDRIPTlVE STATISTICS GROUND WATER WElL 21.AA CONTINUED <br />Jy6Y 1,1999 -JUNE 30, 2000 <br /> <br />Parameter (mg/I) EPA Method TOTAL <br />SAMPLES BELOW <br />DETECTION MAXIMUM <br />VALUE MINIMUM <br />VALUE <br />MEAN VALUE STANDARD <br />DEVIATION <br />Bromide M3001C 12 12 5 0.05 1.54 1.75 <br />Carbon, dissolved organic M415.1 Combustion 12 0 30 11 18.8 5.9 <br />Cation-Anion Balance % Calculation 12 7 4 -8.1 -1.1 3.7 <br />Sum of Anions meq/L 11 0 407 0 327.17 105.52 <br />Sum of Cations meq/L 11 0 365 0 313.42 99.67 <br />Chloride M325-2 Colorimetric (RFA) 12 0 1965 600 740 386 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 12 0 23600 19400 22925 1156 <br />Fluoride M340.21SE 12 0 310 27 53.2 80.9 <br />Hardness as CaC03 SM2340B -Calculation 12 0 110 36 52 20 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 12 0.2 0.01 0.13 0.06 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.2 0.01 0.13 0.06 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.065 0.030 <br />pH (units) M150.1 Eleclrometric 12 0 8.2 7.6 8.0 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 0 1.1 0.6 0.860 0.142 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 4 1.205 0.05 0.773 0.434 <br />Total Dissolved Solids M160.t -Gravimetric 12 0 24600 17300 19425 1729 <br />Sodium Absorption Ratio in H2O USGS 11738-78 12 0 564 331 494.67 62.05 <br />Sulfate M375.3 -Gravimetric 12 6 50 5 25 19 <br />Sulfide as S SM427C -Mod Methyl Blue 12 8 0.7 0.02 0.17 0.21 <br />TDS (talc) Calculation 12 0 20300 17600 18742 989 <br />TDS ratio Ratio -measured/calculated 11 0 1.23 0 0.96 0.31 <br />Temperature Degrees C (Field) 12 0 17.4 10.4 12.7 2.3 <br />Gross Alpha Result (pCi/L) M9310 12 0 390 0 90.4 103.2 <br />Gross Alpha Error (pCi/L) M9310 12 0 180 76 120.8 30.7 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />110 <br />76 <br />98.7 <br />8.5 <br />Gross Beta Result (pCi/L) M9310 12 0 240 0 93.8 92.7 <br />Gross Beta Error (pCi/L) M9310 12 0 120 75 100.1 14.3 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />155 <br />110 <br />133.8 <br />12.3 <br /> <br />Analyte concentrations reported below the detection limit are sel equal to one half the detection limit for all statistical calculations. <br />