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• <br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20-9 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 1.16 1.90 <br />Carbon, dissolved organic M415.1 Combustion 12 0 20 7 13.0 4.1 <br />Cation-Anion Balance % Calculation 12 8 5.4 -8.8 -1.4 4.3 <br />Sum of Anions meq/L 12 0 124 93.1 107.76 7.36 <br />Sum of Cations meq/L 12 0 113 98 104.63 4.72 <br />Chloride M325-2 Colorimetric (RFA) 12 0 390 290 322 30 <br />Cond @ 25C (umhos/cm) Mt20.1 -Meter 12 0 8820 7700 8293 350 <br />Fluoride M340.21SE 12 0 250 5 44.6 65.1 <br />Hardness as CaC03 SM2340B -Calculation 12 0 48 43 46 2 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 10 0.2 0.01 0.0$ 0.05 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 10 0.2 0.01 0.08 0.05 <br />Nitrite as N, dissolved M353.2 Aulo Cad Red 12 12 0.1 0.005 0.037 0.029 <br />pH (units) M150.1 Electrometric 12 0 8.6 7.7 8.0 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 1 0.25 0.02 0.135 0.072 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 12 4 0.25 0.0025 0.171 0.080 <br />Total Dissolved Solids M160.t -Gravimetric 12 0 5980 5500 5720 177 <br />Sodium Absorption Ratio in H2O USGS 1(738-78 12 0 165 140 152.63 6.94 <br />Sulfate M375.3 -Gravimetric 12 11 800 5 79 228 <br />Sulfide as S SM427C -Mod Methyl Blue 12 2 0.9 0.06 0.30 0.26 <br />TDS (talc) Calculation t2 0 6450 5180 5704 309 <br />TDS ratio Ratio - measuredicaicuiated 12 0 1.13 0.87 1.01 0.06 <br />Temperature Degrees C (Field) t2 0 15 9.2 12.5 1.7 <br />Gross Alpha Result (pCi/L) M9310 12 0 53 0 14.4 18.5 <br />Grass Alpha Error (pCi/L) M9370 12 0 62 24 38.4 11.0 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />40 <br />20 <br />30.8 <br />5.0 <br />Gross Bela Result (pCi/L) M931o 12 0 45 0 10.7 15.5 <br />Gross Bela Error (pCi/L) M9310 12 0 36 20 29.1 4.4 <br />Beta Minimum Detectable <br />Activity (pCi/L) M93t0 <br />12 <br />0 <br />46 <br />29 <br />40.9 <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 />