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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,unless noted <br /> Sample Designation MW-3 MW-3 ' <br /> Page 10 of 20 <br /> Sampling Date 4/1/1999 7/7/1999 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) <0.89 <0.89 <br /> 1,1-Dichloroethene <0.72 <0.72 <br /> Chloroform <0.83 <0.83 <br /> Chlorobenzene <0.90 <br /> Chloride 13 7.1 <br /> Nitrate-Nitrogen 4.1 2.9 <br /> Total Dissolved Solids 179 213 <br /> Sulfate 5.1 1.9 <br /> pH(std.units)(field) 7.77 7.41 <br /> Electrical Conductivity(umhos/cm)(field) 268 271 <br /> Turbidity(NTU)(field) 1.3 1.01 <br /> Temperature(°C)(field) 19.3 24.6 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR <br /> Organochlorine Pesticides and Polychlorinated Biphenyl's <br /> (EPA Method 3510/8080) <br /> All Compounds NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR <br /> •Analytical results reflect composite samples. <br /> [1]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 1:8/30/1999 QA/QC <br />