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<br /> <br />DESCRIPTIVE STATISTICS GROUND WATER WELD 19.2 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 t2 9 2 0.05 0.52 0.53 <br />Carbon, dissolved organic M415.1 Combustion 12 0 33 6 21.0 9.5 <br />Cation-Anion Balance °k Calculation 12 9 17.8 -11.7 -0.1 8.3 <br />Sum of Anions meq/L 12 0 41.9 14.1 34.99 8.08 <br />Sum of Cations meq/L 12 0 41.4 20.2 34.44 6.70 <br />Chloride M325-2 Colorimetric (RFA) 11 0 750 210 555 146 <br />Cond @ 25C (umhos/cm) M120.1 -Meter 12 0 3930 1410 3260 713 <br />Fluoride M340.21SE 11 0 16 10.3 12.3 1.7 <br />Hardness as CaC03 SM2340B -Calculation 12 0 411 142 326 90 <br />Nitrate as N, dissolved Calculation: N03N02-N02 12 10 1.63 0.01 0.23 0.44 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 12 10 1.63 0.01 0.23 0.44 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 12 12 0.1 0.005 0.045 0.032 <br />pH (units) M150.1 Electrometric 12 0 8.1 6.4 6.9 0.5 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 12 1 0.32 0.025 0.163 0.118 <br />Phosphorus, artho dissolved M365.1 Auto Ascorbic Acid 12 3 0.27 0.0025 0.135 0.103 <br />Total Dissolved Solids Mt60.1 -Gravimetric 12 0 2380 1000 1926 409 <br />Sodium Absorption Ratio in H2O USGS 11738-78 12 0 18.5 14.2 15.29 1.17 <br />Sulfate M375.3 -Gravimetric 12 12 5 5 5 0 <br />Suede as S SM427C -Mod Methyl Blue 12 1 2.4 0.01 1.08 0.70 <br />TDS (talc) Calculation 12 0 2300 890 1902 406 <br />TDS ratio Ratio -measured/calculated 12 0 1.12 0.9 1.01 0.06 <br />Temperature Degrees C (Field) 12 0 15.3 10.1 12.6 1.7 <br />Gross Alpha Result (pCi/L) M9310 12 0 41 0 12.4 13.7 <br />Gross Alpha Error (pCi/L) M9310 12 0 28 5.1 15.8 7.0 <br />Alpha Minimum Detectable <br />Activity (pCilL) M9310 <br />12 <br />0 <br />18 <br />5.7 <br />11.8 <br />3.4 <br />Gross Beta Result (pCUL) M9310 12 0 33 0 13.9 10.6 <br />Gross Beta Error (pCi/L) M93t0 12 0 19 5.2 12.1 3.7 <br />Beta Minimum Detectable <br />Activity (pCi/L) M9310 <br />12 <br />0 <br />21 <br />7.5 <br />15.8 <br />4.3 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />