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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/l,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 Page 6 of 20 <br /> Sampling Date 4/2/1996 7/9/1996 10/2/1996 1/16/1997 4/10/1997 7/10/1997 10/3/1997 3/11/1998 4/30/1998 7/7/1998 10/9/1998 1/15/1999 4/1/1999 <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 <br /> l,l-Dichloroethene <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 <br /> Chloride 6 6 6 5 4.7 4.9 7.2 8.2 7.2 7.2 6.7 7.6 9.2 <br /> Nitrate-Nitrogen 2.9 2.6 3.3 2.5 2.8 3 2.8 3.9 3.3 3.2 3.3 3.5 3.2 <br /> Total Dissolved Solids 220 220 180 210 199 180 204 183 159 188 180 157 145 <br /> Sulfate <0.7 2 2 1.4 1.4 1.4 1.8 1.9 2 2 2 2.2 1.8 <br /> pH(std.units)(field) 7.31 7.50 6.95 8.73 7.25 7.84 7.69 7.55 7.34 7.14 8.27 8.16 7.7 <br /> Electrical Conductivity(umhos/cm)(field) 200 207 201 870 415 130 217 176 257.9 209 198 199 196 <br /> Turbidity(NTU)(field) 6.8 5.1 10.5 3.4 2.8 2.42 40 1.2 22.6 2.1 1.7 LOW 1.46 <br /> Temperature(°C)(field) 20.6 21.9 20.8 14.1 24.4 22.7 21.5 20.4 20.1 22.4 20.4 19.7 19.4 <br /> Constituents of 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 NR NR NR 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 NR NR NR NR. NR NR NR NR <br /> •Analytical results reflect composite samples. <br /> [11 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 1:6/21/1999 QA/QC <br />