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HISTORICAL.SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:nrg/I,unless noted <br /> SampleDesibmation MW-3 MW-3 MW-3 MW-3 MW-3 Page 10 of 20 <br /> Sampling Date 5/11/00 7/13/00 10/9/00 1/15/01 4/30/01 <br /> Ouarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> Methylene Chloride <0.03 <0.06 <0.06 <0.06 <0.06 <br /> Trichloroethene(TCE) 0.652 0.285" 0.323" 0,717 0.435" <br /> I,l-Dichloroethene 0.285 0.0795" 0.0688" 0.316" 0.217" <br /> Chloroform <0.06 <0.07 <0.07 <0.07 <0.07 <br /> Chlorobenzene <0.07 <0.07 -0.07 -0.07 -0.07 <br /> Acetone <1.79 <1.79 <1.79 <1.79 <br /> Napthalene <0.1 <0.1 <0.I <0.1 <br /> Methyl ter-butyl ether <0.08 <br /> Toluene <0.07 <br /> Chloride 9.73 9.6 9.96 12 9.76 <br /> Nitrate-Nitrogen 3.45 3.36 3.5 3.64 3.48 <br /> Total Dissolved Solids 204 188 196 191 199 <br /> Sulfate 6.98 7.62 7.19 7.66 7.00 <br /> pH(std.units)(field) 7.8 8.23 7.41 7.01 6.6 <br /> Electrical Conductivity(umhos/cm)(field) 273 272 272 316 600 <br /> Turbidity(NTU)(field) 0.33 0.55 0.21 2.35 12.1 <br /> Temperature(°C)(field) 20.5 21.7 20 23.7 19.3 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds 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 <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR <br /> "=Trace Concentration <br /> [I 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\1 list, Revision 1:6/28/01 QA/QC <br />