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• <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-3D 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 />Bromitle M3001C 10 10 5 0.5 2.15 2.06 <br />Carbon, dissolved organic M415.1 Combustion 10 0 54 17 27.5 10.8 <br />Cation-Anion Balance % Calculation 10 3 3.3 -3.2 1.1 2.2 <br />Sum of Anions meq/L 9 0 731 0 603.70 214.90 <br />Sum of Cations meq/L 9 0 703 0 613.80 215.$7 <br />Chloride M325-2 Colorimetric (RFA) 10 0 1410 1160 1316 66 <br />Cond @ 25C (umhos/cm) M120.t -Meter t0 0 41900 31500 40410 3141 <br />Fluoride M340.21SE 10 0 71 44 59.5 7.3 <br />Hardness as CaC03 SM2340B -Calculation 10 0 152 40 62 33 <br />Nitrate as N, dissolved Calculation: N03N02-N02 10 9 0.4 0.05 0.15 0.10 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 10 9 0.4 0.05 0.15 0.10 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 10 9 1.92 0.005 0.258 0.588 <br />pH (units) M150.1 Electrometric 10 0 8.5 7.9 8.2 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 10 0 5.3 0.5 3.220 1.815 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 10 0 5.2 0.9 3.425 1 .310 <br />Total Dissolved Solids M160.1 -Gravimetric 10 0 38800 37300 38160 427 <br />Sodium Absorption Ratio in H2O USGS 11736-78 10 0 1060 575 914.60 144.30 <br />Sulfate M375.3 -Gravimetric 10 8 50 5 42 15 <br />Sulfide as S SM427C -Mod Methyl Blue 10 3 0.5 0.08 0.23 0.14 <br />TDS (talc) Calculation 10 0 37800 34600 36080 1147 <br />TDS ratio Ratio-measured/calculated 9 0 1.11 0 0.96 0.34 <br />Temperature Degrees C (Field) 1D 0 17.1 9.7 12.7 2.8 <br />Gross Alpha Result (pCilL) M9310 1D 0 540 0 132.8 180.1 <br />Gross Alpha Error (pCi/L) M9310 10 0 480 130 257.0 100.1 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />t0 <br />0 <br />360 <br />130 <br />210.0 <br />77.6 <br />Gross Beta Result (pCilL) M9310 10 0 610 0 171.3 186.6 <br />Gross Beta Error (pCi/L) M9310 10 0 330 150 210.0 59.8 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />10 <br />0 <br />440 <br />180 <br />283.0 <br />88.2 <br /> <br />Analyle concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />