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N • M <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 28-1 CONTINUED <br />JULY 1, 1999 -APRIL 30, 2000 <br /> <br />Parameter (mg/I) EPA Melhod TOTAL <br />SAMPLES BELOW <br />DETECTION MAXIMUM <br />VALUE MINIMUM <br />VALUE <br />MEAN VALUE STANDARD <br />DEVIATION <br />Bromide M3001C 10 4 1 0.1 0.41 0.26 <br />Carbon, dissolved organic M415.1 Combustion 10 0 20 8 11.6 3.2 <br />Cation-Anion Balance % Calculation 10 8 22.9 -8.4 -0.9 8.7 <br />Sum of Anions meglL 10 0 73.4 37.9 64.26 10.36 <br />Sum of Cations meq/L 10 0 73.6 50.3 62.62 6.97 <br />Chloride M325-2 Colorimetric (RFA) 10 0 82 53 71 9 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 10 0 5280 3640 4783 513 <br />Fluoride M340.21SE 9 0 0.9 0 0.7 0.3 <br />Hardness as CaC03 SM2340B -Calculation 10 0 1590 1060 1315 171 <br />Nitrate as N, dissolved Calculation: N03N02-N02 10 1 1.4 0.05 0.35 0.39 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 10 1 1.4 0.05 0.35 0.39 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 10 10 0.1 0.005 0.030 0.032 <br />pH (units) M150.1 Electrometric 10 0 8.3 7.5 7.9 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 10 4 0.2 0.005 0.059 0.060 <br />Phosphorus, ortho dissolved M365 1 Auto Ascorbic Acid 10 5 1.58 0.014 0.226 0.485 <br />Total Dissolved Solids M160.1 -Gravimetric 10 0 4260 3450 3985 237 <br />Sodium Absorption Ratio in H2O USGS 11738-78 10 0 10.5 8.93 9.96 0.46 <br />Sulfate M375.3 -Gravimetric t0 0 2350 710 1960 478 <br />Sulfide as S SM427C -Mod Methyl Blue 10 9 0.2 0.01 0.08 0.06 <br />TDS (talc) Calculation 10 0 4480 2570 3864 564 <br />TDS ratio Ralio-measured/calculaletl to 0 1.5 0.95 1.05 0.16 <br />Temperature Degrees C (Field) t0 0 17.1 10.9 14.4 2.5 <br />Gross Alpha Result (pCi/L) M9310 10 1 60 -17 10.5 20.4 <br />Gross Alpha Error (pCi/L) M9310 10 0 34 12 22.5 6.5 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />10 <br />0 <br />21 <br />12 <br />17.6 <br />2.8 <br />Gross Beta Result (pCi/L) M9310 10 1 37 -20 6.7 15.2 <br />Gross Beta Error (pCi/L) M9310 10 0 27 12 17.3 4.6 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />to <br />0 <br />31 <br />17 <br />23.3 <br />5.1 <br /> <br />nalyte concentrations reported below the detection limit are set equal to one half the detection limit for all statisUCal calculations. <br />