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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,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 Page 9 of 20 <br /> Sampling Date 1/4/96 4/2/96 7/9/96 10/2/96 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 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/I) <br /> Methylene Chloride <br /> Trichloroethene(TCE) trace <0.4 <0.4 trace <0.5 0.86 <0.4 <0.89 <0.89 <0.89 <0.89 <0.89 4 <br /> I,I-Dichloruethene <0.4 <0.4 <0.4 trace <0.4 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 2.6 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <br /> Chloroben/enc <br /> Acetone <br /> Napthalene <br /> Chloride 9 9 9 9 7.3 7.5 7 8.7 11 Il 10 10 10.2 <br /> Nitrate-Nitrogen 3.3 3.9 3.3 4.1 3 3.6 2.6 3.3 3.9 4.2 4.2 4.2 0.23 <br /> Total Dissolved Solids 250 250 230 230 230 178 220 246 216 215 229 198 173 <br /> Sulfate 6 5 6 6 4.9 4.5 5 5.5 6 6.1 6.2 6 6.8 <br /> pH(std.units)(field) 7.81 7.48 7.49 7.34 8.68 7 7.08 7.8 7.81 7.72 8.18 7.5 8.28 <br /> Electrical Conductivity(umbos/cm)(field) 294 277 289 275 460 238 266 267 242 277.3 271 264 272 <br /> Turbidity(NTU)(tield) 42 120.3 58.0 65.1 2.3 2.1 1.98 19.38 0.8 18.7 2.5 15.1 LOW <br /> Temperature(°C)(field) 18.4 20.8 22.5 21.3 17.1 25.3 24 22.2 20.17 21.8 23.8 20.6 17.7 <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 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 NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR Nit NR NR NR NR NR NR NR NR NR NR <br /> *_-Trace Concentration <br /> I I'I'his analytical result eppcars to he anomalous and diclOolr was not used in stalisticsl evaluation pruccdurc.s. <br /> ND -Not Detected <br /> NR=Not Required <br /> N:\XLS\0939\00408\1-list, Revision 1:1/3/01 QA/QC <br /> ® ® ® = M <br />