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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 20-1 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 5 4 5 0.25 2.45 2.35 <br />Carbon, dissolved organic M415.1 Combustion 5 0 50 3 33.8 19.6 <br />Cation-Anion Balance % Calculation 5 3 20 -2.9 5.0 9.7 <br />Sum of Anions meq/L 5 0 1080 610 907.80 182.62 <br />Sum of Cations meq/L 5 0 1320 738 1003.60 213.60 <br />Chloride M325-2 Colorimetric (RFA) 5 0 14200 5480 10236 3262 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 5 0 68900 3320 48124 25660 <br />Fluoride M340.21SE 5 0 47.4 30.4 39.8 6.5 <br />Hardness as CaC03 SM2340B -Calculation 4 2 66 0 17 28 <br />Nitrate as N, dissolved Calculation: N03N02-N02 5 5 0.2 0.1 0.14 0.05 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 5 5 0.2 0.1 0.14 0.05 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 5 5 0.1 0.05 0.070 0.027 <br />pH (units) M150.1 Electrometric 5 0 8.5 7.7 7.9 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 5 0 8.2 4.3 6.320 1.424 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 5 0 11.6 1 6.360 3.829 <br />Total Dissolved Solids MtsO.t -Gravimetric 5 0 63600 43800 55980 7371 <br />Sodium Absorption Ratio in H2O USGS 11738-78 5 3 3170 0.015 862.01 1381.41 <br />Sulfate M375.3 -Gravimetric 5 1 200 5 87 72 <br />Sulfide as S SM427C -Mod Methyl Blue 5 0 20 0.51 6.30 8.22 <br />TDS (talc) Calculation 5 0 59100 37200 52020 8854 <br />TDS ratio Raoo -measured/calculated 5 0 1.18 1 1.08 0.07 <br />Temperature Degrees C (Field) 5 0 17.6 9.8 14.3 3.1 <br />Gross Alpha Result (pCi/L) M9310 5 0 770 0 172.4 336.4 <br />Gross Alpha Error (pCi/L) M9310 5 0 600 180 372.0 161.6 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />5 <br />0 <br />410 <br />140 <br />304.0 <br />103.1 <br />Gross Beta Result (pCi/L) M9310 5 0 520 7.7 239.9 248.9 <br />Gross Beta Error (pCi/L) M9310 5 0 290 170 262.0 51.7 <br />Beta Minimum Detectable <br />Activity (pCilL) M9310 <br />5 <br />0 <br />440 <br />220 <br />360.0 <br />82.8 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />