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<br />DESCRIPTIVE STATISTICS GRO!{ND WAFER WALL 21-2 CONTINUED <br />JULY 1, 1999 - MARCtt 31, 2400 <br /> <br />Parameter (m /I) EPA Method TOTAL <br />SAMPLES BELOW <br />DETECTION MAXIMUM <br />VALUE MINIMUM <br />VALUE <br />MEAN VALUE STANDARD <br />DEVIATION <br />Bromide M3001C 9 7 2 0.05 0.37 0.63 <br />Carbon, dissolved or anic M415.1 Combustion 9 0 10 4 5.0 1.9 <br />Cation Anion Balance o Calculation 9 1 4.3 ~2.2 0.7 1.7 <br />Sum of Anions me /L 8 0 33.9 0 26.81 10.24 <br />Sum of Cations meq/L 8 0 34.7 0 26.94 10.31 <br />Chloride M325-2 Colorimetric (RFA) 9 0 23 12 14 3 <br />Cond ~ 25C (umhos/cm) M 120.1 Meter 9 0 3630 2090 2447 468 <br />Fluoride M340.21SE 9 0 0.5 0.4 0.4 0.0 <br />Hardness as CaC03 SM2340B Calculation 9 0 1060 891 982 52 <br />Nitrate as N, dissolved Calculation: N03N02-N02 9 3 0.5 0.01 0.20 0.17 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 9 4 0.5 0.01 0.20 0.17 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 9 9 0.1 0.005 0.033 0,033 <br />pH (units) M150.lElectrometric 9 0 8 6.4 7.1 0.4 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 9 4 0.2 0.005 0.067 d: 64 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 9 5 0.38 0.0025 0.109 0.144 <br />Total Dissolved Solids M160.1 -Gravimetric 9 0 2550 1550 1722 318 <br />Sodium Absorption Ratio in H2O USGS 11738-78 9 0 8.85 2.81 3.88 1.90 <br />Sulfate M375.3 ~ Gravimetric 9 0 550 530 537 7 <br />Sulfide as S SM427C -Mod Meth I Blue 9 6 0.5 0.01 0.18 0.16 <br />TDS (talc) Calculation 9 0 2550 1560 1784 303 <br />TDS ratio Ratio measured/calculated 9 0 1.01 0 0.85 0.32 <br />Temperature De rees C (Field) 9 0 15.3 8.7 11.8 2.3 <br />Gross Alpha Result (pCi/L) M9310 9 0 20 0 4.5 8.3 <br />Gross Alpha Error ( Ci/L) M9310 9 0 19 9 12.7 3.2 <br />p a inimum a ec a e c rvi y <br />(pCi/L) M9310 <br />9 <br />0 <br />14 <br />6.6 <br />9.3 <br />2.2 <br />Gross Beta Result (pCi/L) M9310 9 0 28 0 8.4 9.7 <br />Gross Beta Error (pCi/L) M9310 9 0 15 7.3 9.6 2.3 <br />e a inimum a ec a e c rvi y <br />(pCi/L) M9310 <br />9 <br />0 <br />19 <br />9.2 <br />12.4 <br />2.8 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />