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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> GROUNDWATER <br /> FOOTHILL SANITARY LANDFILL <br /> MW-3 <br /> Units:mg/l,unless noted <br /> Sample Designation MW-3 MW-3 MW-3 MW-3 <br /> Sampling Date 8/14/03 1/21/04 7/22/04 2/2/05 <br /> Monitoring and Field Parameters <br /> General Water Qualitv Parameters <br /> Temperature(°C)(field) 19.6 14.4 21.6 16.9 <br /> Chloride 11 11 11 10 <br /> Nitrate-Nitrogen 3.8 3.8 3.6 3.2 <br /> Total Dissolved Solids 190 210 210 190 <br /> Sulfate 7.6 7.7 6.8 6 <br /> pH(std units)(field) 7.02 7.32 7.26 6.88 <br /> Electrical Conductivity(umhos/cm), 274 207 269 290 <br /> Turbidity(NTU)(field) 6.7 14.7 7.81 10.6 <br /> Calcium 25 21 20 21.6 <br /> Potassium 1.5 2.8 3.1 4 <br /> Magnesium 13 11 11 11.4 <br /> Sodium 18 15 15 17.2 <br /> Volatile Organic Compounds(ug/I) <br /> Trichloroethene(TCE) <0.36 <0.36 <0.36 <0.13 <br /> 1,1-Dichloroethene <0.24 <0.24 <0.24 <0.39 <br /> Chloroform <0.37 <0.37 <0.37 <0.20 <br /> Benzene <0.28 <0.28 <0.28 <0.17 <br /> m/p-Xylene <0.38 <0.38 <0.38 NR <br /> Chlorobenzene <0.32 <0.32 <0.32 <0.16 <br /> Methylene Chloride {0 28*) <0.23 <0.23 <0.48 <br /> Acetone (1.4*) <0.52 <0.52 (3.4*) <br /> Napthalene <0.93 <0.93 <0.93 <0.24 <br /> Methyl tert-butyl ether <0.36 <0.36 <0.36 <0.32 <br /> Toluene <0.32 <0.32 <0.32 <0.22 <br /> 1,4-Dichlorobenzene <0.46 <0.46 <0.46 <0.14 <br /> Tetrachloroethene <0.44 <0.44 <0.44 <0.19 <br /> 2-Butanone <0.14 <0.14 <0.14 <0.92 <br /> 1,3-Dichloropropane <0.40 <0.40 <0.40 <0.12 _ <br /> Chloromethane (0.22*) <0.18 <0.18 (0.28*) <br /> 1 2 4-Trimethylbenzene <0.18 <0.18 <0.18 <0.23 <br /> 1 3 5-Trimethylbenzene <0.28 <0.28 <0.28 <0.20 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds(EPA Method 3520/8270) <br /> Bis(2-ethylhexyl)phthalate ND ND 2.6* 98 _ <br /> All Other Compounds NR NR ND NR <br /> Organochlorine Pesticides and Polychlorinated Biphenvl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR ND 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-3;Printed:7/15/2005 15 of 28 <br />