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<br /> <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20-8 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 10 0.625 0.05 0.18 0.19 <br />Carbon, dissolved organic M415.t Combustion 12 1 6 2 4.2 1.2 <br />Cation-AnionBalance% Calculation 12 7 11 -7.6 -0.8 4.9 <br />Sum of Anions meq/L 12 0 73.3 42.9 58.66 7.73 <br />Sum of Cations megll 12 0 63.2 39.3 57.55 6.99 <br />Chloride M325-2 Colorimetric (RFA) 12 0 121 73 102 14 <br />Cond @ 25C (umhos/cm) M120.1 -Meter t2 0 6390 3510 4665 788 <br />Fluoride M340.21SE 12 0 7 3.9 5.7 0.8 <br />Hardness as CaC03 SM2340B -Calculation 12 0 469 235.5 308 54 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 10 0.4 0.01 0.14 0.12 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 10 0.4 0.01 0.14 0.12 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.053 0.033 <br />pH (units) M150.1 Electrometric 12 0 8 7.6 7.8 0.1 <br />Phosphorus, dissolved M365.1 Aulo Ascorbic Acid 12 2 0.2 0.025 0.084 0.043 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 5 0.25 0.01 0.118 0.089 <br />Total Dissolved Solids M160.1 -Gravimetric 12 0 3480 2160 3107 384 <br />Sodium Absorption Ratio in H2O USGS 11738-76 12 0 33 13.7 29.20 5.31 <br />Sulfate M375.3 -Gravimetric 12 0 310 120 159 56 <br />Sulfide as S SM427C -Mod Methyl Blue 12 0 15 1.9 9.27 3.64 <br />TDS (talc) Calculation 12 0 3670 2230 3113 376 <br />TDS ratio RaLO-measuretl/calculated 12 0 1.1 0.89 1.00 0.05 <br />Temperature Degrees C (Field) 12 0 19.3 15 16.4 1.4 <br />Gross Alpha Result (pCi/L) M9310 12 0 45 0 15.6 15.0 <br />Gross Alpha Error (pCi/L) M9310 12 0 32 12 20.4 5.9 <br />Alpha Minimum Detectable <br />Activity (pCilL) M9310 <br />12 <br />0 <br />20 <br />12 <br />17.4 <br />2.7 <br />Gross Beta Result (pCi/L) M9310 12 0 41 0 16.9 14.5 <br />Gross Beta Error (pCi/L) M9310 12 0 26 12 18.2 4.1 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />31 <br />18 <br />25.0 <br />5.5 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />