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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21-4D AND 21-4DX 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 6 5 50 1 10.75 19.31 <br />Carbon, dissolved organic M415.1 Combustion 6 0 73 22 41.5 17.1 <br />Cation-Anion Balance % Calculation 6 0 8 2.8 5.6 1.8 <br />Sum of Anions meglL 5 0 1110 0 884.00 434.88 <br />Sum of Cations meq/L 5 0 1280 0 988.33 489.1$ <br />Chloride M325-2 Colorimetric (RFA) 6 0 8200 6880 7692 485 <br />Cond @ 25C (umhos/cm) Mt2o.1 -Meter 6 0 61800 6200 49050 21797 <br />Fluoride M340.21SE 6 0 65 45 55.3 7.1 <br />Hardness as CaC03 SM2340B -Calculation 5 0 91 0 58 37 <br />Nitrate as N, dissolved Calculation: N03N02-N02 6 5 0.8 0.1 0.23 0.28 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 6 5 0.8 0.1 0.23 0.28 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 6 5 1.62 0.05 0.320 0.637 <br />pH (units) M150.1 Electrometric 6 0 8.4 7.9 8.2 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 6 0 6.8 3.4 5.500 1.131 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 6 0 7.76 4.5 5.898 1 .348 <br />Total Dissolved Solids M160.1 -Gravimetric 6 0 69100 58600 63783 4032 <br />Sodium Absorption Ratio in H2O USGS 11738-78 6 1 2180 0.015 1251.67 713.34 <br />Sulfate M375.3 -Gravimetric 6 3 100 10 47 31 <br />Sulfide as S SM427C -Mod Methyl Blue 6 4 0.5 0.1 0.23 0.16 <br />TDS (talc) Calculation 6 0 66800 56600 61383 3999 <br />TDS ratio Ratio -measured/calculated 5 0 1.15 0 0.8$ 0.43 <br />Temperature Degrees C (Field) 6 0 19 13.1 15.6 2.1 <br />Gross Alpha Result (pCi/Lj M9310 6 0 710 0 193.3 310.6 <br />Gross Alpha Error (pCi/L) M93t0 6 0 510 250 398.3 93.9 <br />Alpha Minimum Detectable <br />Activity (pCi/L) M9310 <br />6 <br />0 <br />430 <br />290 <br />336.7 <br />54.3 <br />Gross Beta Result (pCi/L) M9310 6 0 490 4 246.3 211.7 <br />Gross Beta Error (pCi/L) M9310 6 0 320 300 305.0 8.4 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />6 <br />0 <br />470 <br />380 <br />415.0 <br />35.1 <br /> <br />Analyte concentrations reported below the detectlon limit are set equal to one half the detection limit for all statistical calculations. <br />