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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,unless noted <br /> Sample Designation MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 Page 3 of 20 <br /> Sampling Date 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 4/1/99 7/7/99 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <br /> I,1-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <br /> Chlorobenzenc <br /> 2.6 <br /> Acetone <br /> Napthalene <br /> Chloride G 6 4.7 4.7 4.7 6.1 8 6.8 6.5 6.4 0.23 8.2 6.7 <br /> Nitrate-Nitrogen 2.3 2.9 2.1 2.4 2.3 2.4 3.4 2.8 12 2.8 2.3 2.6 2 <br /> Total Dissolved Solids 250 210 225 187 194 216 196 186 202 176 162 165 182 <br /> Sulfate 6 7 4.9 5.1 4.8 6 6.5 6.6 6.4 6.5 6.5 5.9 6.3 <br /> pli(std.units)(field) 7.65 7.25 9.28 7.65 7.83 7.93 7.97 8.03 8.22 6.93 8.37 7.08 7.77 <br /> Electrical Conductivity(umhos/em)(field) 257 245 610 153 173 278 224 245 237 251 243 235 236 <br /> Turbidity(NTIJ)(field) 51.9 16.9 2.27 3.47 2.69 56.5 1 29.6 4 2.9 LOW 3.25 1.43 <br /> Temperature('C)(field) 22.3 21.8 15.2 24.4 21.5 22 19.5 20.6 22.7 20.8 18 20.8 20.1 <br /> Constituents ol'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 NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR Nit NR Nit Nit NR Nit Nit NR NR NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR NR NR NR <br /> *=Trace Concentration <br /> [I I This analytical result appears to be anomalous and theretore was not used in statistical evaluation procedures. <br /> ND=Not Detected <br /> NR=Not Required <br /> N:\XLS\0939\00408\1 list, Revision I:1/3/01 QA/QC <br />