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• <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-30 CONTINUED <br />JULY 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 0.2 1.45 1.71 <br />Carbon, dissolved organic M415.1 Combustion 12 0 30 8 14.2 7.0 <br />Cation-Anion Balance % Calculation 12 6 9.7 -3.2 1.7 3.4 <br />Sum of Anions meq/L 12 0 633 213 287.92 110.13 <br />Sum of Cations meq/L 12 0 578 245 286.13 92.24 <br />Chloride M325-2 Colorimetric (RFA) 12 0 1160 560 644 166 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 12 0 37500 17900 20100 5489 <br />Fluoride M340.21SE t2 0 38.1 18 23.2 5.1 <br />Hardness as CaC03 SM23406 -Calculation 12 0 120 25 80 22 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 8 0.4 0.01 0.14 0.10 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 8 0.4 0.01 0.14 0.10 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.041 0.027 <br />pH (units) M150.1 Elecirometric 12 0 9 7.7 8.0 0.4 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 0 5.1 0.08 1.018 1.301 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 1 4.92 0.25 0.998 1 .247 <br />Total Dissolved Solids M160.t -Gravimetric 12 0 34100 14200 16058 5683 <br />Sodium Absorption Ratio in H2O USGS 11738-78 12 0 1160 231 354.83 254.23 <br />Sulfate M375.3 -Gravimetric 12 3 300 10 55 82 <br />Sulfide as S SM427C -Mod Methyl Blue 12 2 1.2 0.1 0.54 0.32 <br />TDS (talc) Calculation t2 0 35200 12400 15475 6235 <br />TDS ratio Ral~o ~ measured/calcuialetl t 2 0 1.16 0.97 1.05 0.05 <br />Temperature Degrees C (Field) 12 0 16.9 0 11.5 4.7 <br />Gross Alpha Result (pCi/L) M9310 12 1 290 -78 42.4 94.5 <br />Gross Alpha Error (pCi/L) M9310 12 0 150 36 91.5 36.8 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M931o <br />12 <br />0 <br />150 <br />7.6 <br />63.5 <br />34.7 <br />Gross Beta Result (pCi/L) M9310 12 2 310 -65 70.3 92.9 <br />Gross Beta Error (pCi/L) Mg3t0 t2 0 160 35 79.0 34.4 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />230 <br />47 <br />100.1 <br />48.0 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />