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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> MW-2 <br /> Units:mgll 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 Qua% Parameters <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 /> Sulfate2.1 2.3 2.1 2.2 <br /> -pH(std uni (fel <br /> Electrical Conductivity(umhos/cm 260 240 369_ 20.1 <br /> vTurbidit-NTU)_field-- 7.1 7.7-- 3.9 _ 1 <br /> Temperature(°C)(field) 20.6 20.6 15.9 20.3 - <br /> Calcium NM 18 <br /> _Potassium NM <0.92 <br /> Sodium NM 9.3 <br /> Magnesium NM 7.8 - <br /> Volatile Organic Compounds(ug/I) <br /> Methylene Chloride <0.06 <0.3 <0.23 <0.23 <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 /> Chlorobenzene <0.07 <0.2 <0.32 <0.32 <br /> Acetone 2.2" <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 /> Tetrachloroethene <0.08 <0.3 <0.44 <0.44 <br /> 2-Butanone <0.70 <2.0 <0.14 <0.14 <br /> 13-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 /> 5-Tri <br /> 1 3 methylbenzene _ 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 Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR <br /> '=Trace Concentration <br /> [1]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;Printed:7/8/03 15 of 24 <br />