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<br />DESCRIPTIVE STATISTICS GROUND WATER WELL 21.5 CONTINUED <br />JULY 1, 1999 -MARCH 31, 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 9 6 1 0.05 0.33 0.30 <br />Carbon, dissolved or anic M415.1 Combustion 9 0 10 6 6.6 1.3 <br />Cation Anion Balance ~ Calculation 9 4 1.4 -2.8 •0.1 1.3 <br />Sum of Anions meq/L 8 0 33.2 0 29.04 10.90 <br />Sum of Cations me /L 8 0 33.5 0 28.93 10.87 <br />Chloride M325-2 Colorimetric (RFA) 8 0 37 0 27 10 <br />Cond @ 25C (umhos/cm) M 120.1 Meter 9 0 2660 2110 2527 178 <br />Fluoride M340.21SE 8 0 1.5 0 1.2 0.5 <br />Hardness as CaC03 SM2340B ~ Calculation 9 0 691 632 656 17 <br />Nitrate as N, dissolved Calculation: N03N02~N02 9 6 0.6 0.01 0.17 0.17 <br />Nitrate/Nitrite as N, dissolved M353.2 Auto Cad Red 9 6 0.6 0.01 0.17 0.17 <br />Nitrite as N, dissolved M353.2 Auto Cad Red 9 8 0.1 0.005 0.033 0.032 <br />pH (units) M150.1 Electrometric 9 0 8.3 7.6 7.9 0.2 <br />Phosphorus, dissolved M365.1 Auto Ascorbic Acid 9 0 0.4 0.03 0.223 0.098 <br />Phos horns, ortho dissolved M365.1 Auto Ascorbic Acid 9 2 1.55 0.18 0.383 0.439 <br />Total Dissolved Solids M160.1 - Gravimetric 9 0 1900 1780 1831 37 <br />Sodium Absorption Ratio in H2O USGS 1173878 9 0 7.75 7.25 7.52 0.19 <br />Sulfate M375.3 - Gravimetric 9 0 710 700 704 5 <br />Sulfide as S SM427C -Mod Meth I Blue 9 8 0.1 0.01 0.08 0.03 <br />TDS (talc Calculation 9 0 1930 1880 1899 20 <br />TDS ratio Raho measured/calculated 8 0 0.99 0 0.86 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 1 14 -9.7 3.5 7.4 <br />Grass Alpha Error (pCi/L) M9310 9 0 14 7.9 11.0 2.1 <br />p a inimum a ec a e c ivi y <br />(pCi/L) M9310 <br />9 <br />0 <br />12 <br />7.6 <br />9.4 <br />1.6 <br />Grass Beta Resull (pCi/L) M9310 9 1 13 -1.9 3.9 5.5 <br />Gross Beta Error (pCi/L) M9310 9 0 12 7 9.1 1.8 <br />e a inimum a ec a e c rvi y <br />(pCi/L) M9310 <br />9 <br />0 <br />17 <br />3 <br />11.3 <br />4.0 <br /> <br />Analyte concentrations reported below the detection limit are set equal to one half the detection limit for all statistical calculations. <br />