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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:me .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 Page 6of20 <br /> Sampling Date 4/10/97 7/10/97 10/3/97 3/11/98 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 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/I) <br /> Methylene Chloride 0.0821• 2.45 <0.03 <0.06 <0.06 <br /> Trichloroethene(TCE) <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.06 <0.06 <0.06 <0.06 <0.06 <br /> IJ-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.04 <0.04 <0.05 <0.06 <0.06 <br /> Chlorol'omt <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <0.07 <br /> Chlorobenzene 2.7 <0.07 <0.07 <0.07 <0.07 <0.07 <br /> Acetone ND ND ND ND 2.09' <1.79 <br /> Napthalene ND ND ND ND 0.11* <O.1 <br /> Chloride 4.7 4.9 7.2 8.2 7.2 7.2 6.7 7.6 9.2 6.4 6.55 7.02 7.04 6.98 7.3 <br /> Nitrate-Nitrogen 2.8 3 2.8 3.9 3.3 3.2 3.3 3.5 3.2 3.4 2.62 2.75 2.82 2.8 3.06 <br /> Total Dissolved Solids 199 I80 204 183 159 188 180 157 145 172 165 163 169 162 163 <br /> Sulfate 1.4 1.4 1.8 1.9 2 2 2 2.2 1.8 5.9 3.04 3.68 2.67 3.9 3.48 <br /> pH(std.units)(field) 7.25 7.84 7.69 7.55 7.34 7.14 8.27 8.16 7.7 7.78 7.94 7.15 8.3 8.47 6.7 <br /> Electrical Conductivity(umhos/cm)(field) 415 130 217 176 257.9 209 198 199 196 196 196.9 197 188 202 203 <br /> Turbidity(NTU)(field) 2.8 2.42 40 1.2 22.6 2.1 1.7 LOW 1.46 1.95 0.46 1.2 2 0.67 0.58 <br /> Temperature(°C)(field) 24.4 22.7 21.5 20.4 20.1 22.4 20.4 19.7 19.4 22.2 20.6 18 19.5 20.5 19.7 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR ND NR NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR ND NR NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR ND NR NR NR NR <br /> °=Trace Concentration <br /> (I)This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> ND=Not Detected <br /> NR=Not Required <br /> N:\XLS\0939\00408\Hist, Revision 1:4/4/01 QA/QC <br />