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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:nig/l,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 MW-1 MW-1 Page 2of20 <br /> Sampling Date 7/1/93 10/4/93 1/5/94 4/5/94 7/5/94 11/28/94 4/21/95 7/6/95 10/11/95 1/5/96 4/2/96 7/9/96 10/2/96 1/16/97 4/10/97 <br /> Otwrterly Monitoring and Field Parameter <br /> Volatile Organic Compounds(ug/1) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) <br /> 1,1-Dichloroethene <br /> Chloroform <br /> Chlorobenzene <br /> Acetone <br /> Napthalene <br /> Methyl ter-butyl ether <br /> Toluene <br /> Chloride 6 5 7 5 7 6.3 4.9 5 6 6 5 6 6 4.7 4.7 <br /> Nitrate-Nitrogen 2.3 2.4 1.3 2 1.4 2.4 2.6 2.4 2.3 2.1 2.5 2.3 2.9 2.1 2.4 <br /> Total Dissolved Solids 200 200 210 220 220 186 200 160 240 230 230 250 210 225 187 <br /> Sulfate 6 6 <8 <8 10 6.5 4.9 6 7 6 6 6 7 4.9 5.1 <br /> PH(std.units)(field) 7.46 6.79 7.80 7.62 7.89 8.48 7.89 7.81 7.86 7.97 7.35 7.65 7.25 9.28 7.65 <br /> Electrical Conductivity(umhos/cm)(field) 301 248 305 294 281 287 245 263 269 246 236 257 245 610 153 <br /> Turbidity(NTU)(field) NR NR NR NR NR 36.9 18 34 14 11 20.8 51.9 16.9 2.27 3.47 <br /> Temperature(°C)(field) NR NR NR NR NR 13.7 20.2 22.5 21.5 18.6 21.3 22.3 21.8 15.2 24.4 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR ND 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 ND NR NR NR NR NR NR NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR Nit Nit Nit Nit ND Nit Nit NR NR Nit NR Nit NR NR <br /> •=Trace Concentration <br /> [1]This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. <br /> NO=Not Detected <br /> NR=Not Required <br /> N:\XLS\0939\00408\Hist, Revision l:6/28/01 QA/QC <br />