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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20-4B 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 M3001C g 9 0.5 0.05 0.21 0.22 <br />Carbon, dissolved organic M415.1 Combustion 9 0 20 4.5 11.7 5.5 <br />Cation-Anion Balance % Calculation 9 3 4.3 -12.8 -0.4 4.9 <br />Sum of Anions meglL 9 0 67.6 24.3 32.62 13.34 <br />Sum of Cations meq/L 9 0 68.2 24.9 32.42 13.55 <br />Chloride M325-2 Colorimetric (RFA) 9 0 140 15 50 52 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 9 0 5360 2170 2634 1027 <br />Fluoride M340.21SE 9 0 24 13.5 16.7 3.3 <br />Hardness as CaC03 SM2340B -Calculation 9 0 64 27 41 12 <br />Nitrate as N, dissolved Calculation: N03N02-N02 9 8 0.2 0.05 0.14 0.06 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 9 8 0.23 0.05 0.14 0.06 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 9 8 0.1 0.005 0.052 0.031 <br />pH (units) Mt50.1 Electrometric 9 0 8.6 7.7 8.0 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 9 0 0.26 0.02 0.110 0.069 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 9 3 0.27 0.05 0.166 0.077 <br />Total Dissolved Solids M160.1 - Gravimetric 9 0 3730 1400 1744 749 <br />Sodium Absorption Ratio in H2O USGS 11738-78 9 0 110 29 50.98 23.23 <br />Sulfate M375.3 - Gravimetric 9 3 40 5 19 14 <br />Sulfide as S SM427C -Mod Methyl Blue 9 1 4 0.1 1.26 1.12 <br />TDS (talc) Calculation 9 0 3600 1340 1743 702 <br />TDS ratio Ratio -measured/calculated 9 0 1.05 0.95 1.00 0.04 <br />Temperature Degrees C (Field) 9 0 19.7 9.4 12.3 3.3 <br />Gross Alpha Result (pCilL) M9310 9 0 110 0 28.1 36.5 <br />Gross Alpha Error (pCilL) M9310 9 0 45 5.1 18.7 13.1 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />9 <br />0 <br />20 <br />7.5 <br />11.4 <br />5.2 <br />Gross Beta Result (pCi/L) M9310 9 0 100 0 18.4 32.8 <br />Gross Beta Error (pCi/L) M9310 9 0 26 7.6 13.2 7.5 <br />Beta Minimum Delectable <br />Activity (pCi/L) M9310 <br />9 <br />0 <br />30 <br />11 <br />16.9 <br />8.1 <br /> <br />L.J <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />