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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/l,unless noted Page 10 of 20 <br /> Sample Desibmation MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 <br /> Sampling Date 4/1/1999 7/7/1999 10/20/1999 3/8/2000 5/11/2000 7/13/2000 <br /> Ouarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> Methylene Chloride <0.03 2.43 <0.03 <0.06 <br /> Trichloroethene(TCE) <0.89 <0.89 <0.06 0.227* 0.652 0.285* <br /> l,l-Dichloroethene <0.72 <0.72 <0.04 <0.04 0.285 0.0795* <br /> Chloroform <0.83 <0.83 <0.06 <0.07 <0.06 <0.07 <br /> Chlorobenzene <0.90 <0.07 <0.07 <0.07 <0.07 <br /> Acetone <I.79 <br /> Napthalene <0.1 <br /> Chloride 13 7.1 9.61 9.7 9.73 9.6 <br /> Nitrate-Nitrogen 4.1 2.9 3.5 3.21 3.45 3.36 <br /> Total Dissolved Solids 179 213 220 202 204 188 <br /> Sulfate 5.1 1.9 6.57 7.24 6.98 7.62 <br /> pH(std.units)(field) 7.77 7.41 7.9 7.36 7.8 8.23 <br /> Electrical Conductivity(umhos/cm)(field) 268 271 270 264 273 272 <br /> Turbidity(NTU)(field) 1.3 1.01 >200 3.3 0.33 0.55 <br /> Temperature(°C)(field) 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 ND NR NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR ND NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR ND NR NR NR <br /> *=Trace Concentration <br /> [1I 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 1:8/31/2000 OA/QC <br />