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HISTORICAL SUMMAR NALYTICAL RESULTS <br /> GRO TER <br /> FOOTHILL SARITARY LANDFILL <br /> MW-2` <br /> Units:mg/l,unless noted <br /> Sample Designation MW-2 MW-2 MW-2 MW-2 <br /> Sampling Date 8/1/02 10/14/02 1/29/03 5/30/03 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 20.6 20.6 15.9 20.3 <br /> Chloride 7.4 8 7.7 7.4 <br /> Nitrate-Nitrogen 3.3 3.4 3.5 3.4 <br /> Total Dissolved Solids 160 170 160 170 <br /> Sulfate 2.1 2.3 2.1 2.2 <br /> pH(std units)(field) 7.16 6.79 6.81 7.7 <br /> Electrical Conductivity(umhos/cm) 260 240 369 201 <br /> Turbidity(NTU)(field) 7.1 7.7 3.9 1 <br /> Calcium NM 18 <br /> Potassium NM <0.92 <br /> Magnesium NM 7.8 <br /> Sodium NM 9.3 <br /> Volatile Organic Compounds(ug/1) <br /> Trichloroethene(TCE) <0.06 <0.2 <0.36 <0.36 <br /> 1,1-Dichloroethene <0.06 <0.2 <0.24 <0.24 <br /> _Chloroform <0.07 <0.3 <0.37 <0.37 <br /> Benzene <0.5 <0.20 <0.28 <0.28 <br /> m/p-Xylene <0.21 <0.20 <0.38 <0.38 <br /> Chlorobenzene <0.07 <0.2 <0.32 <0.32 <br /> Methylene Chloride <0.06 <0.3 <0.23 <0.23 <br /> Acetone 12.2-1 <2.0 <0.52 <0.52 <br /> Napthalene <0.10 <0.3 <0.93 <0.93 <br /> Methyl tert-butyl ether <0.08 <0.3 <0.36 <0.36 <br /> Toluene <0.07 <0.2 <0.32 <0.32 <br /> 1,4-Dichlorobenzene <0.11 <0.2 <0.46 <0.46 <br /> Tetrachioroethene <0.08 <0.3 <0.44 <0.44 <br /> 2-Butanone <0.70 <2.0 <0.14 <0.14 <br /> 1 3-Dichloropropane <0.09 <0.2 <0.40 <0,40 <br /> Chloromethane <0.14 <0.3 <0.18 <0.18 <br /> 1 2 4-Trimethylbenzene 0.69 <br /> 1,3,5-Trimethylbenzene 0.29" <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Bighenvl'� <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR <br /> =Trace Concentration <br /> [1 J This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> (1)Parameter also detected in one or more quality control blanks <br /> ND=Not Detected <br /> NM=Not Measured <br /> NR=Not Required <br /> MW-2(abandoned);Printed:7/15/2005 27 of 28 <br />