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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-2 CONTINUED <br />JULY 1, 1999 -APRIL 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 M3o01C 10 8 2 0.05 0.37 0.63 <br />Carbon, dissolved organic M415.1 Combustion 10 0 10 4 5.0 1.9 <br />Cation-Anion Balance % Calculation 10 1 4.3 -2.2 0.9 1.8 <br />Sum of Anions meq/L 9 0 33.9 0 26.82 10.24 <br />Sum of Cations meq/L 9 0 34.7 0 27.10 10.33 <br />Chloride M325-2 Colorimetric (RFA) 10 0 23 10 14 4 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 10 0 3630 2090 2446 469 <br />Fluoride M340.21SE 10 0 0.4 0.3 0.4 0.0 <br />Hardness as CaC03 SM2340B -Calculation 10 0 1060 891 988 48 <br />Nitrate as N, dissolved Calculation: N03N02-N02 10 4 0.5 0.01 0.17 0.17 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 10 5 0.5 0.01 0.17 0.18 <br />Nitdte as N, dissolved M353.2 Auto Cad Red 10 10 0.1 0.005 0.026 0.033 <br />pH (units) M150.1 Electrometric 10 0 8 6.8 7.2 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 10 4 0.2 0.005 0.063 0.063 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 10 6 0.38 0.0025 0.109 0.143 <br />Total Dissolved Solids M160.1 -Gravimetric 10 0 2550 1550 1719 320 <br />Sodium Absorption Ratio in H2O USGS 11738-78 10 0 8.85 2.81 3.88 1.90 <br />Sulfate M375.3 -Gravimetric 10 0 550 530 537 7 <br />Sulfide as S SM427C -Mod Methyl Blue 10 6 0.5 0.01 0.18 0.16 <br />7DS (talc) Calculation 10 0 2550 1590 1788 300 <br />TDS ratio Ratio-measured/calculated 10 0 0.97 0 0.85 0.32 <br />Temperature Degrees C (Field) 10 0 15.3 8.7 12.0 2.2 <br />Gross Alpha Result (pCi/L) M9310 10 1 18 -7.3 1.4 6.7 <br />Gross Alpha Error (pCi/L) M9310 10 0 19 8.4 12.3 3.5 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />10 <br />0 <br />14 <br />6.6 <br />9.1 <br />2.2 <br />Gross Beta Result (pCi/L) M9310 10 0 28 0 6.4 9.4 <br />Gross Beta Error (pCilL) M9310 10 0 15 7.3 9.7 2.4 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />10 <br />0 <br />19 <br />9.2 <br />12.4 <br />2.8 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />