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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-5 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 7 1 0.05 0.30 0.27 <br />Carbon, dissolved organic M415.1 Combustion 12 0 10 6 6.6 1.2 <br />Cation-Anion Balance % Calculation 12 6 2.1 -2.8 0.0 1.3 <br />Sum of Anions meq/L 11 0 33.9 0 30.04 9.48 <br />Sum of Cations meq/L 11 0 33.5 0 30.00 9.47 <br />Chloride M325-2 Colorimetric (RFA) 11 0 37 0 27 9 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 12 0 2660 2110 2553 160 <br />Fluoride M340.21SE 11 0 1.5 0 1.3 0.4 <br />Hardness as CaC03 SM2340B -Calculation 12 0 691 632 657 14 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 9 0.6 0.01 0.15 0.16 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 9 0.6 0.01 0.15 0.16 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 11 0.1 0.005 0.034 0.030 <br />pH (units) M150.1 Electrometric 12 0 8.3 7.6 7.9 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 0 0.5 0.03 0.253 0.115 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 2 1.55 0.18 0.371 0.377 <br />Total Dissolved Solids M160.1 -Gravimetric 12 0 1920 1780 1845 42 <br />Sodlum Absorption Ratio in H2O USGS 11738-78 12 0 7.78 7.25 7.57 0.19 <br />Sulfate M375.3 -Gravimetric 12 0 720 700 706 7 <br />Sulfide as S SM427C -Mod Methyl Blue 12 9 0.1 0.01 0.08 0.04 <br />TDS (talc) Calculation 12 0 1950 1880 1905 23 <br />TDS ratio Ratio-measured/calculated 11 t) 1 t) 0.89 0.28 <br />Temperature Degrees C (Field) 12 0 15.5 8.1 12.0 2.1 <br />Gross Alpha Result (pCi/L) M9310 12 1 14 -9.7 2.9 6.4 <br />Gross Alpha Error (pCi/L) M9310 12 0 14 7.1 10.2 2.4 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />12 <br />7.6 <br />9.2 <br />1.4 <br />Gross Beta Result (pCi/L) M9310 12 1 14 -1.9 5.7 5.9 <br />Gross Beta Error (pCi/L) M9310 12 0 12 7 9.2 1.6 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />17 <br />3 <br />11.6 <br />3.5 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />