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<br /> <br />DESCRIPTIVE STATI5TICS GROUND WATER WELL 20.5 CONTINUED <br />JULY 1, 1999 -MARCH 31, 2000 <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 9 5 0.05 1.41 2.05 <br />Carbon, dissolved or anic M415.1 Combustion 9 1 11 4 6.9 2.3 <br />Cation-Anion Balance qo Calculation 9 8 0.7 -7.4 -3.2 2.9 <br />Sum of Anions meq/L 9 0 76.7 47 66.69 9.62 <br />Sum of Cations meq/L 9 0 69.9 44.6 62.49 8.32 <br />Chloride M325-2 Colorimetric (RFA) 9 0 165 83 116 24 <br />Cond (d125C (umhos/cm) M120.1 ~ Meter 9 0 6060 4150 5463 579 <br />Fluoride M340.21SE 9 0 11 5.3 8.0 1.7 <br />Hardness as CaC03 SM2340B -Calculation 9 0 400 178 237 76 <br />Nitrate as N, dissolved Calculation: N03N02-N02 9 7 0.3 0.01 0.13 0.10 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 9 7 0.3 0.01 0.13 0.10 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 9 9 0.1 0.005 0.043 0.038 <br />pH (units) M150.lElectrometric 9 0 8.4 7.6 7.9 0.3 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 9 2 0.2 0.025 0.075 0.054 <br />Phosphorus, ortho dissolved M365.1 Auto Ascorbic Acid 9 3 2.11 0.03 0.427 0.663 <br />Total Dissolved Solids M160.1 Gravimetric 9 0 3880 2510 3473 446 <br />Sodium Absorption Ratio in H2O USGS 11738.78 9 0 47.5 18.3 39.19 10.27 <br />Sulfate M375.3 -Gravimetric 9 0 190 10 60 62 <br />Sulfide as S SM427C -Mod Methyl Blue 9 0 20 0.4 6.52 7.11 <br />TDS (calc) Calculation 9 0 3880 2470 3454 470 <br />TDS ratio Ratio ~ measured/calculated 9 0 1.07 0.95 1.01 0.04 <br />Temperature De rees C (Field) 9 0 15.3 8.7 11.8 2.3 <br />Gross Alpha Result (pCi/L) M9310 9 1 47 -8.5 6.8 16.1 <br />Gross Alpha Error (pCi/L) M9310 9 0 51 14 25.9 11.6 <br />p a Inlmum a ec a e c ivi y <br />(pCi/L) M9310 <br />9 <br />0 <br />47 <br />13 <br />21.8 <br />9.8 <br />Gross Beta Result (pCi/L) M9310 9 1 32 -16 10.6 15.0 <br />Gross Beta Error (pCi/L) M9310 9 0 35 11 21.1 7.2 <br />e a Inlmum a ec a e c IvI y <br />(pCi/L) M9310 <br />9 <br />0 <br />41 <br />16 <br />27.3 <br />7.4 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />