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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,unless noted <br /> Sample Designation MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 LW-I LW-I LW-I LW-I LW-I LW-i LW-1 L -IF Of 26 LW-I <br /> Sampling Date 7/7/99 10/20/99 3/8/00 5/11/00 7/13/00 10/9/00 7/10/89 10/20/89 1/17/90 4/4/90 7/12/90 10/2/90 1/7/91 4/2/91 7/19/91 <br /> (quarterly Monitorine and Field Paramcicrs <br /> Volatile Organic Compounds(ug/1) <br /> Methylene Chloride 0.0821* 2.45 <0.03 <0.06 <0.06 <br /> Trichloroethene(TCE) <0.89 <0.06 <0.06 <0.06 <0.06 <0.06 <br /> ],I-Dichloroethene <0.72 <0.04 <0.04 <0.05 <0.06 <0.06 <br /> Chloroform <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* <0.1 <br /> Chloride 6.4 6.55 7.02 7.04 6.98 7.3 9 11 10.3 10.2 9.6 8.3 8.9 9 9.5 <br /> Nitrate-Nitrogen 3.4 2.62 2.75 2.82 2.8 3.06 0.34[1) 1.2 1.3 1.3 1.2 1.2 NR NR NR <br /> Total Dissolved Solids 172 165 163 169 162 163 175 155 150 196 106 194 179 198 164 <br /> Sulfate 5.9 3.04 3.68 2.67 3.9 3.48 13 14 14.8 14.6 14.5 13.9 11.5 14.6 14.3 <br /> pH(std.units)(field) 7.78 7.94 7.15 8.3 8.47 6.7 8.00 NR NR NR NR NR NR NR NR <br /> Electrical Conductivity(umhos/cm)(field) 196 196.9 197 188 202 203 279 NR NR NR NR NR NR NR NR <br /> Turbidity(NTU)(field) 1.95 0.46 1.2 2 0.67 0.58 NR NR NR NR NR NR NR NR NR <br /> Temperature(°C)(field) 22.2 20.6 18 19.5 20.5 19.7 NR NR NR Nit NR NR NR NR NR <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds Nit ND NR NR NR NR Nit Nit Nit Nit Nit Nit Nit NR Nit <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR ND Nit NR Nit NR NR NR NR NR NR NR NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR ND NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> * <br /> -Trace Concentration <br /> [1 I This analytical result appears to be anomalous and thcrObje was not used in statistical evaluation procedures. <br /> ND=Not Detected <br /> NR=Not Required <br /> N:\XLS\0939\00408\Flist, Revision 1:1/3/01 QA/QC <br />