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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-4U 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 0.05 1.69 2.02 <br />Carbon, dissolved organic M415.1 Combustion 12 0 24 7 14.8 4.8 <br />Cation-Anion Balance % Calculation 12 3 6.1 -3.3 1.9 2.8 <br />Sum of Anions meq/L 12 0 250 209 223.92 13.19 <br />Sum of Cations meq/L 12 0 247 219 232.17 8.71 <br />Chloride M325-2 Colorimetric (RFA) 12 0 530 430 460 28 <br />Cond @ 25C (umhos/cm) M720.1 -Meter 12 0 17200 13800 16000 833 <br />Fluoride M340.21SE 12 0 31 22 25.5 2.6 <br />Hardness as CaC03 SM2340B -Calculation 12 0 61 44 47 5 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 10 0.3 0.06 0.15 0.07 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 10 0.3 0.06 0.15 0.07 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.063 0.030 <br />pH (units) M150.1 Electrometric 12 0 8.5 7.7 8.0 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 0 0.8 0.4 0.642 0.126 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 3 0.9 0.05 0.578 0.255 <br />Total Dissolved Solids M160.1 - Gravimelric 12 0 13200 12300 12650 261 <br />Sodium Absorption Ratio in H2O USGS 11738-78 12 0 355 314 337.33 12.90 <br />Sulfate M375.3-Gravimelric 12 10 200 5 35 56 <br />Sulfde as S SM427C -Mod Methyl Blue 12 5 0.5 0.08 0.15 0.12 <br />TDS (calc) Calculation 12 0 13300 11500 12158 616 <br />TDS ratio Ratio -measured/calculated 12 0 1.12 0.94 1.04 0.05 <br />Temperature Degrees C (Field) 12 0 16.6 9.7 12.3 2.1 <br />Gross Alpha Result (pCi/L) M9310 12 0 240 0 37.8 65.1 <br />Gross Alpha Error (pCi/L) M9310 12 0 120 32 73.6 25.7 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />89 <br />43 <br />61.9 <br />13.7 <br />Gross Beta Result (pCi/L) M9310 12 0 220 0 57.6 60.8 <br />Gross Beta Error (pCi/L) M9310 12 0 90 42 62.0 14.0 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />110 <br />62 <br />82.4 <br />14.1 <br /> <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />