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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 28-1 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 4 1 0.1 0.43 0.25 <br />Carbon, dissolved organic M415.1 Combustion 12 0 20 8 11.5 2.9 <br />Cation-Anion Balance % Calculation 12 9 22.9 -8.4 -0.7 7.9 <br />Sum of Anions meq/L 12 0 73.4 37.9 65.08 9.60 <br />Sum of Cations meq/L 12 0 73.6 50.3 63.70 7.04 <br />Chloride M325-2 Colorimetric (RFA) 12 0 83 53 72 9 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 12 0 5390 3640 4839 496 <br />Fluoride M340.21SE 11 0 0.9 0 0.7 0.2 <br />Hardness as CaC03 SM2340B -Calculation 12 0 1590 1060 1337 168 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 2 1.4 0.05 0.32 0.36 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 2 1.4 0.05 0.32 0.36 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.033 0.030 <br />pH (units) M150.1 Electrometric 12 0 8.3 7.5 7.9 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 4 1.68 0.005 0.192 0.472 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 5 1.58 0.014 0.191 0.446 <br />Total Dissolved Solids M160.1 - Gravimetric 12 0 4380 3450 4006 248 <br />Sodium Absorption Ratio in H2O USGS 11738-78 12 0 10.8 8.93 10.06 0.49 <br />Sulfate M375.3 - Gravimetrlc 12 0 2350 710 1993 441 <br />Sulfide as S SM427C -Mod Methyl Blue 12 11 0.2 0.01 0.08 0.06 <br />TDS (talc) Calculation 12 0 4480 2570 3921 532 <br />TDS ratio Rabo-measuretl/calculated 12 0 1.S 0.95 1.04 0.15 <br />Temperature Degrees C-(Field) 12 0 17.1 10.9 14.3 2.2 <br />Gross Alpha Result (pCi/L) M9310 12 1 60 -17 9.0 18.8 <br />Gross Alpha Error (pCi/L) M9310 12 0 34 12 23.3 6.2 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />21 <br />12 <br />17.8 <br />2.6 <br />Gross Beta Result (pCi/L) M9310 12 2 37 -23 3.7 16.3 <br />Gross Beta Error (pCi/L) M9310 12 0 27 12 17.8 4.4 <br />Bela Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />31 <br />17 <br />23.9 <br />4.9 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />