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HISTORICAL SUMMAR NALYTICAL RESULTS <br /> GRO TER is <br /> FOOTHILL SA111MY LANDFILL <br /> MW-2 <br /> Units:mg/I unless noted <br /> Sample Designation MW-2 MW-2 MW-2 MW-2 MW-2 MW 2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 <br /> Sampling Date 4/30/98 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 <br /> Monitoring and Field Parameters <br /> General Water Quality Parameters <br /> Temperature(°C)(field) 20.1 14.4 20.4 19,7 19.4 22.2 20.6 18 19.5 20.5 19.7 15.8 19.8 20.8 19.3 16.8 17.7 <br /> Chloride 7.2 11 6.7 7.6 9.2 6.4 6.55 7.02 7.04 6.98 7.3 7.12 7.05 6.6 <0.13 8.5 6.9 <br /> Nitrate-Nitrogen 3.3 3.8 3.3 3.5 3.2 3.4 2.62 2.75 2.82 2.8 3.06 2.94 2.92 2.9 2.7 4 3.1 <br /> _Total Dissolved Solids 159 210 180 157 145 172 165 163 169 162 163 171 172 160 160 160 180 <br /> Sulfate 2 7.7 2 2.2 1.8 5.9 3.04 3.68 2.67 3.9 3.48 3.47 3.01 2.9 2.5 2.4 1.3 <br /> pH(std units)(field) 7.34 7.32 8.27 8.16 7.7 7.78 7.94 7.15 8.3 8.47 6.7 7.98 6.54 7.4 6.19 6.71 6.80 <br /> Electrical Conductivity(umhos/cm) 257.9 207 198 199 196 196 196.9 197 188 202 203 198 570 190 380 180 260 <br /> _Turbidity(NTU)(field) 22.6 14,1 Id LOW 1.46 1.95 0.46 1.2 2 0.67 0.58 2.14 10.6 7.2 9.7 2.8 4.8 <br /> Calcium <br /> Potassium <br /> Magnesium <br /> Sodium <br /> Volatile Organic Compounds(uo/I) <br /> Trichloroethene(TCE) <0.89 <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 <br /> 1,1-Dichloroethene <0.72 <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 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.18 <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 <br /> m/p-Xylene <0.78 <0.78 <0.78 <0.21 <0.21 <0.07 <0.21 <0.21 <0.21 <0.21 <0.21 <0.21 <0.24 <0.21 <br /> Chlorobenzene 2.7 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <0.16 <0.07 <br /> Methylene Chloride {0.0821-) 245 <0.03 <0.06 <0.06{0.0989*} <0.06 <0.06 <0.06 {1.6} {0.17*} <br /> Acetone ND ND ND ND {2.09*} <1.79 <1.79 <1.79 <1.8 <1.8 {4.5*} {2.8*} <br /> Napthalene ND ND ND ND 0.11* <0.1 <0.1 <0.1 <0.1 <0.1 <0.46 <0.10 <br /> Methyl tert-butyl ether 0.0859* <0.08 <0.08 <0.08 <0.18 <0.08 <br /> Toluene <0.07 <0.07 <0.07 <0.16 <0.07 <br /> 1,4-Dichlorobenzene <0.11 <0.11 <0.23 <0.11 <br /> Tetrachloroethene <0.08 <0.08 <0.22 <0.08 <br /> 2-Butanone 1.9* <0.70 <0.65 <0.70 <br /> 13-Dichloropropane 0.42* <0.09 <br /> Chloromethane 0.16* <br /> 1 2 4-Trimethylbenzene <br /> 1 3 5-Trimethylbenzene <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR NR ND NR NR NR NR NR NR NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biohenvl'� <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR NR NR ND 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-2(abandoned);Printed:7/15/2005 25 of 28 <br />