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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20-4A CONTINUED <br />JULY 1, 1999 • MARCH 31, 2©00 <br /> <br />Parameter m /I) EPA Method TOTAL <br />SAMPLES BELOW <br />DETECTION MAXIMUM <br />VALUE MINIMUM <br />VALUE <br />MEAN VALUE STANDARD <br />DEVIATION <br />Bromide M3001C 8 8 5 0.05 0.89 1.67 <br />Carbon, dissolved or anic M415.1 Combustion 8 1 18 5 10.6 5.1 <br />Cation~Anion Balance o Calculation 8 6 0.5 -10.5 3.1 3.7 <br />Sum of Anions meq/L 8 0 628 40.5 120.27 205.27 <br />Sum of Cations meq/L 8 0 595 39.95 113.46 194.63 <br />Chloride M325.2 Calorimetric (RFA) 8 0 1000 250 423 251 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 8 0 37500 3570 8980 11664 <br />Fluoride M340.21SE 8 0 40 9.9 15.1 10.2 <br />Hardness as CaC03 SM23406 ~ Calculation 8 0 35 2 18 10 <br />Nitrate as N, dissolved Calculation: N03N02-N02 8 7 0.2 0.01 0.12 0.07 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 8 7 0.2 0.01 0.12 0.07 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 8 8 0.1 0.005 0.054 41 <br />pH (units) M150.lElectrometric 8 0 12.1 9 10.0 1.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 8 0 4.6 0.02 0.669 1.589 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 8 3 5.5 0.05 0.949 1.869 <br />Total Dissolved Solids M160.1 ~ Gravimetric 8 0 34200 2190 6433 11223 <br />Sodium Absorption Ratio in H2O USGS 1173878 8 0 1880 66.3 360.23 625.82 <br />Sulfate M375.3 ~ Gravimetric 8 0 300 50 99 82 <br />Sulfide as S SM427C -Mod Meth I Blue 8 1 5.9 0.1 2.87 1.96 <br />TDS (colt) Calculation 8 0 35500 2330 7066 11504 <br />TDS ratio Ratio measured/calculated 8 0 0.96 0.69 0.85 0.10 <br />Temperature De rees C (Field) 8 0 13.7 8.7 11.3 2.0 <br />Gross Alpha Result (pCi/L) M9310 8 0 1600 0 207.0 562.9 <br />Gross AI ha Error (pCi/L) M9310 8 0 540 2 82.8 185.0 <br />p a inimum a ec a e c ivi y <br />(pCi/L) M9310 <br />8 <br />0 <br />280 <br />11 <br />48.8 <br />93.5 <br />Gross Beta Result (pCi/L) M9310 8 0 380 0 60.2 130.0 <br />Gross Beta Error (pCi/L) M9310 8 0 350 11 58.5 117.9 <br />e a inimum a ec a e c rvi y <br />(pCi/L) M9310 <br />8 <br />0 <br />430 <br />15 <br />72.6 <br />144.5 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />