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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:m/I,unless noted <br /> Sample Designation MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 MW-2 Page 5of20 <br /> Sampling Date 7/1/93 10/4/93 1/5/94 4/5/94 7/5/94 11/28/94 1/16/95 4/21/95 7/6/95 10/11/95 1/5/96 4/2/96 7/9/96 10/2/96 1/16/97 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> Methylene Chloride <br /> Trichloroethene(TCE) <br /> 1,1-Dichloroethene <br /> Chloroform <br /> Chlorobenzene <br /> Acetone <br /> Napthalene <br /> Chloride 6 6 8 5 6 6.6 6 5.1 6 6 6 6 6 6 5 <br /> Nitrate-Nitrogen 2.9 2.9 1.3 2.0 1.6 2.9 2.9 3.0 2.8 2.6 2.5 2.9 2.6 3.3 2.5 <br /> Total Dissolved Solids 170 180 190 200 190 162 180 170 130 200 200 220 220 f80 210 <br /> Sulfate <5 <5 <8 <8 <8 1.5 trace 1.1 trace trace <0.7 <0.7 2 2 1.4 <br /> PH(std.units)(field) 7.48 7.10 7.52 7.35 7.56 7.76 7.79 7.66 7.55 7.75 8.30 7.31 7.50 6.95 8.73 <br /> Electrical Conductivity(umhos/cm)(field) 248 198 250 230 234 242 230 196 212 225 201 200 207 201 870 <br /> Turbidity(NTU)(field) NR NR NR NR NR 4.2 2.2 8 18 10 7 6.8 5.1 10.5 3.4 <br /> Temperature(°C)(field) NR NR NR NR NR 15.7 16.7 20.1 22.4 22.0 19.7 20.6 21.9 20.8 14.1 <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 NR NR NR NR ND NR NR NR NR NR NR NR NR NR <br /> "=Trace Concentration <br /> [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\Hist, Revision I:4/4/01 QA/QC <br />