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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> NORTH COUNTY SANITARY LANDFILL <br /> Units:mg/1,tmless noted <br /> SampleDesigoabon G-1 G-1 0-1 G-1 G-1 G 1 G-1 G-1 <br /> Samph%Date 01/20/04 04/07/04 07/07/04 10/27/04 01/25/05 05/25/05 0721/05 10/11/05 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(*C) 15.0 15.7 17.9 16.5 14.7 18.9 17.8 16.7 <br /> Chloride 28 33 35 36 28 30 30 27 <br /> Nitrate Nitrogen 3.0 3.7 4.2 3.9 3.6 3.7 3.7 3.4 <br /> Total Dissolved Solids 230 260 280 280 230 210 280 260 <br /> Sulfate 6.7 7.0 8.2 10 8 9 9 9 <br /> PH(std.units) 7.89 7.35 6.94 7.61 7.31 7.38 7.37 6,72 <br /> Electrical Conductivity(umhos/cm) 349 360 204 297 291 373 368 538 <br /> Turbidity(NTU)field 4.28 3.27 4.78 9.68 17.3 14.6 3.46 11.4 <br /> Meas <br /> Calcium 19 23 28 22 21.5 25.4 23 23.2 <br /> Potassium 3.4 1.9 4.7 3.7 4.4 4.4 4.3 4.73 <br /> Magnesium 11 13 16 12 12.3 13.8 IS 20.7 <br /> Sodium 17 19 22 18 20 20.6 14 13.5 <br /> Volatile Organic Compounds Nall) <br /> Acetone <032 (1.3*) (1.1*) <0M <1.8 <1.8 <1.8 <1.8 <br /> Acetonitrile <2.4 Q4 <2.4 <2.4 NT NT NT NT <br /> Acrolein <0.70 <0.70 <0.70 <0.70 NT NT NT NT <br /> Acrylonitrile <0.26 <0.26 <0.26 <0.26 <0.46 <0.46 <0.46 <0.46 <br /> Allyl chloride <0.14 <0.14 <0.14 <0.14 NT NT NT NT <br /> Benzene <0.28 <0.28 ®.28 <0.28 <0.17 <0.17 <0.17 <0.17 <br /> Bromobenzene <0.39 <0.39 <0.39 <0.39 <0.21 <0.21 <0.21 <0.21 <br /> Bromochloromethane <0.42 <0.42 <0.42 <0.42 <0.24 <0.24 <0.24 <0.24 <br /> Bromodichloromethane <0.25 <0.25 <D.25 <0.25 <0.20 <0.20 <0.20 <0.20 <br /> Bromoform <0.18 <0.18 <0.18 <0.18 <0.32 <0.32 <0.32 <0.32 <br /> Bromomethane <0.61 <0.61 <0.61 <0.61 <0.53 <0.53 <0.53 <0.53 <br /> 2-butanone <0.14 <0.14 <D.14 <0.14 <0.92 <0.92 <0.92 <0.92 <br /> n-butylbenzene <0.38 <0.38 <D.38 <0.38 <0.32 <0.32 <032 <0.32 <br /> sec-butylbenzene <0.36 <0.36 <0.36 <0.36 <0.19 <0.19 <D.19 <0.19 <br /> tert-butylbenzene <0.35 <0.35 <0.35 <0.35 <0.20 <0.20 <0.20 <0.20 <br /> Carbon Disulfide <0.29 <0.29 <0.29 <029 <0.45 <0.45 <D.45 <0.45 <br /> Carbon tetrachloride <0.37 <0.37 <0.37 <0.37 <0.35 <0.35 <0.35 <0.35 <br /> Chtorobenzene <0.32 <0.32 <D.32 <0.32 <0.16 <0.16 <0.16 <0.16 <br /> Chloroethane <0.31 <0.31 <0.31 <0.31 <0.41 <0.41 <0.41 <0.41 <br /> 2-chloroethyi vinyl ether <0.22 <0.22 <0.22 <0.22 NT NT NT NT <br /> Chloroform <0.37 <037 <0.37 <0.37 <0.20 <0.20 <0.20 <0.20 <br /> Chloromethane <0.18 <0.18 <0.18 <0.18 <0.25 <0.25 <0.25 <0.25 <br /> Chloroprene <0.10 <0.10 <0.10 <0.10 NT NT NT NT <br /> 2-chlomWluene <0.33 <0.33 <0.33 <0.33 <0.19 <0.19 <0.19 <0.19 <br /> 4-chlorotoluene <0A2 <0,42 <0.42 <0.42 <0.22 <0.22 <0.22 <0.22 <br /> dibromochloromethane <0.47 <0.47 <0.47 <0.47 <0.22 <0.22 <0.22 <0.22 <br /> 1,2-dibromo-3-chtoropane <0.64 <0.64 <0.64 <0.64 <0.58 <0.58 <0.58 <0.58 <br /> 1,2-dibromoethane <0.43 <0.43 <0.43 <0.43 <0.21 <D.21 <0.21 <0.21 <br /> Dibromomethane <0.38 <0.38 <0.38 <0.38 <0.23 <0.23 <0.23 <0.23 <br /> trans-1,4-dichloro-2-butene <0.42 <0.42 <0.42 <0.42 <D.86 <0.86 <0.86 <0.86 <br /> 1,2-dichlorobenzene <0.31 <0.31 m.31 <0.31 <0.14 <0,14 <0.14 <0.14 <br /> 1,3-Dichlorobenzene <0.34 <0.34 <034 <034 <0.13 <0.13 <0.13 <0.13 <br /> 1,4-Dichlorobenzene <0.46 <0.46 <0.46 <0.46 <0.14 <0.14 <0.14 <0.14 <br /> Dichlorodifluoromethane <0.31 <0.31 <0.31 <0.31 <0.28 <0.28 <0.28 <0.28 <br /> NR=Not Required <br /> NT=Not Tested <br /> *=Trace Concentration <br /> [1] This data point appears anomalous and therefore was not used for statistical purposes. <br /> (1)Parameter also detected in one or more quality control blanks. <br /> n:\comuhingldata\guwedbdslgmr�79�7912881NC012405g2 <br />