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~ • <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20.4A 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 11 11 5 0.05 0.76 1.42 <br />Carbon, dissolved organic M415.1 Combustion 11 1 20 5 11.9 5.2 <br />Cation-Anion Balance % Calculation 11 9 0.5 -14.9 -5.5 5.3 <br />Sum of Anions meq/L t t 0 628 40.5 105.81 173.65 <br />Sum of Cations meq/L t t 0 595 39.95 96.85 165.37 <br />Chloride M325-2 Colorimetric (RFA) t 1 0 1350 250 518 355 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 11 0 37500 3570 9385 9833 <br />Fluoride M340.21SE 11 0 40 7 13.3 9.1 <br />Hardness as CaC03 SM2340B -Calculation 11 0 35 2 16 11 <br />Nitrate as N, dissolved Calculation: N03N02-N02 11 10 0.2 0.01 0.10 0.07 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 11 10 0.2 0.01 0.10 0.07 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 11 11 0.1 0.005 0.049 0.038 <br />pH (units) M150.1 Electrometric 11 0 12.6 9 10.6 1.5 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 11 1 4.6 0.02 0.502 1.360 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 11 3 5.5 0.05 0.726 1.610 <br />Total Dissolved Solids M160.1 -Gravimetric 11 0 34200 2190 5514 9525 <br />Sodium Absorption Ratio in H2O USGS 1173ti78 t 1 0 1880 66.3 341.66 530.99 <br />Sulfate M375.3 -Gravimetric 11 0 300 50 89 71 <br />Sulfide as S SM427C -Mod Methyl Blue 11 1 5.9 0.1 3.04 1.70 <br />TDS (talc) Calculation t t 0 35500 2330 6297 9722 <br />TDS ratio Ratio -measured/calculated 11 0 0.96 0.69 0.82 0.10 <br />Temperature Degrees C (Field) 11 0 16.1 9.8 12.3 1.7 <br />Gross Alpha Result (pCi/L) M9310 11 0 1600 0 152.2 480.2 <br />Gross Alpha Error (pCi/L) M9310 11 0 540 2 64.8 157.8 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />11 <br />0 <br />280 <br />11 <br />40.4 <br />79.6 <br />Gross Bela Result (pCi/L) M9310 11 0 380 0 48.7 110.7 <br />Gross Bela Error (pCi/L) M9310 11 0 350 11 47.6 100.4 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />t1 <br />0 <br />430 <br />15 <br />59.8 <br />122.9 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />