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HISTORICAL SUMMARIJKLANALYTICAL RESULTS <br /> GRO TER <br /> FOOTHILL SAIIIIIWRY LANDFILL <br /> MW-1 <br /> Units:mg/1unless noted <br /> Sample Designation MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 <br /> Sampling Date 7/7/98 10/9/98 1/15/99 4/1/99 7/7/99 10/20/99 3/8/00 5/11/00 7/13/00 10/9/00- 1/15/01 4/30/01 8/2/01 10/29/01 2/6/02 4/30/02 8/1/02 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters - <br /> Temperature(°C)(field) 22.7 14.4 18 20.8 20.1 21.3 18.2 23.3 20.5 19.8 17.8 20.0 20.4 19.2 16.6 18.6 20.7 <br /> Chloride 6.5 11 0.23 8.2 6.7 6.09 6.79 6.74 6.03 4.29 6.55 6.23 5.8 7 7.3 6.4 6.4 <br /> Nitrate-Nitrogen 12 3.8 2.3 2.6 2 2.44 2.37 2.51 2.28 3.65 2.7 2.31 2.5 2.3 3 2.8 2.9 <br /> Total Dissolved Solids 202 210 162 165 182 187 180 194 186 184 183 219 180 160 170 190 170 <br /> Sulfate 6.4 7.7 6.5 5.9 6.3 7.43 7.6 7.55 6.48 <0.021 7.02 6.73 6.7 7 7.6 5.2 5.9 <br /> pH(std units)(field) 8,22 7.32 8.37 7.08 7.77 8.06 7.37 7.52 8.5 6.61 7.41 6.92 8.09 6.29 6.91 6.79 7.02 <br /> Electrical Conductivity(umhos/cm) 237 207 243 235 236 237 237 242 240 240 264 710 220 400 100 280 270 <br /> Turbidity(NTU)(field) 4 14.7 LOW 3.25 1.43 1.23 1 4.02 0.49 0.27 2.51 12.4 10 11.7 6.7 7.1 3.4 <br /> Calcium <br /> Potassium <br /> Magnesium <br /> Sodium <br /> Volatile Organic Compounds(ua/I) <br /> Trichloroethene(TCE) <0.89 <0,89 <0.89 <0.89 <0.89 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.18 <0.06 <0.06 <br /> 1,1-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.04 <0.04 <0.05 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <0.12 <0.06 <0.06 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 0.162* <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.18 <0.07 <0.07 <br /> Benzene <1.0 <1.0 <1.0 <0.04 <0.05 <0.04 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.14 <0.05 <0.05 <br /> m/p-Xylene <0.78 <0.78 <0.78 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.24 <0.21 <0.21 <br /> Chlorobenzene 2.6 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.16 <0.07 <0.07 <br /> Methylene Chloride <0.03 0.0448* <0.03 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 {2.4) {0.15*) <0.06 <br /> Acetone 261* <1.79 <1.79 <1.79 <1.79 <1.8 <1.8 (6.8) <1.8 {30) <br /> Napthalene <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.46 <0.10 <0.10 <br /> Methyl tert-butyl ether 0.0859* <0.08 <0.08 <0.18 <0.08 <0.08 <br /> Toluene 0.178* <0.07 <0.07 <0.16 <0.07 <0.07 <br /> 1,4-Dichlorobenzene <0.11 <0.11 <0.23 <0.11 <0.11 <br /> Tetrachloroethene <0.08 <0.08 <0.22 <0.08 <0.08 <br /> 2-Butanone 1.9* <0.65 <0.70 <0.70 <br /> 13-Dichloropropane <0.20 0.42* <0.09 <br /> Chloromethane <0.14 <0.14 <br /> 1 2 4-Trimethylbenzene <br /> 1 3 5-Trimethylbenzene <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds(EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR ND NR NR NR NR NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenvl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR NR ND NR NR NR NR NR NR NR 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-1;Printed:7/15/2005 5 of 28 <br />