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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:m8/l,unless noted <br /> Sample Designation MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 Page 90f20 <br /> Sampling Date 1/16/97 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 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> Methylene Chloride <0.03 2.43 <0.03 <0.06 <br /> Trichloroethene(TCE) <0.5 0.86 <0.4 <0.89 <0.89 <0.89 <0.89 <0.89 4 <0.89 <0.89 <0.06 0.227* 0.652 0.285* <br /> IJ-Dichloroethene <0.4 trace <0.4 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.04 <0.04 0.285 0.0795* <br /> Chlomfon» <0.83 <0.83 2.6 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <br /> Chlorobmzene <0.90 <0.07 <0.07 <0.07 <0.07 <br /> Acetone <1.79 <br /> Napthalene <0.I <br /> Chloride 7.3 7.5 7 8.7 11 11 10 10 10.2 13 7.1 9.61 9.7 9.73 9.6 <br /> Nitrate-Nitrogen 3 3.6 2.6 3.3 3.9 4.2 4.2 4.2 0.23 4.1 2.9 3.5 3.21 3.45 3.36 <br /> Total Dissolved Solids 230 178 220 246 216 215 229 198 173 179 213 220 202 204 188 <br /> Sulfate 49 4.5 5 5.5 6 6.1 6.2 6 6.8 5.1 1.9 6.57 7.24 6.98 7.62 <br /> pH(std.units)(field) 8.68 7 7.08 7.8 7.81 7.72 8.18 7.5 8.28 7.77 7.41 7.9 7.36 7.8 8.23 <br /> Electrical Conductivity(unrhos/cm)(field) 460 238 266 267 242 277.3 271 264 272 268 271 270 264 273 272 <br /> Turbidity(NTU)(field) 2.3 2.1 1.98 19.38 0.8 18.7 2.5 15.1 LOW 1.3 1.01 >200 3.3 0.33 0.55 <br /> Temperature(°C)(field) 17.1 25.3 24 22.2 20.17 21.8 23.8 20.6 17.7 19.3 24.6 21.5 17.3 20.5 21.7 <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 <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 <br /> Chlorinated Ilerbicides <br /> (LPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR ND 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 />