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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 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 MW-3 Page 9 of 20 <br /> Sampling Date 1/4/1996 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 <br /> Quarterly Monitoring and Field Paramete-r's <br /> Volatile Organic Compounds(ug/I) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) trace <0.4 <0.4 trace <0.5 0.86 <0.4 <0.89 <0.89 <0.89 <0.89 <0.89 .4 <br /> 1,1-Dichloroethene <0.4 <0.4 <0.4 trace <0.4 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 2.6 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <br /> Chloride 9 9 9 9 7.3 7.5 7 8.7 11 11 10 10 10.2 <br /> Nitrate-Nitrogen 3.3 3.9 3.3 4.1 3 3.6 2.6 3.3 3.9 4.2 4.2 4.2 0.23 <br /> Total Dissolved Solids 250 250 230 230 230 178 220 246 216 215 229 198 173 <br /> Sulfate 6 5 6 6 4.9 4.5 5 5.5 6 6.1 6.2 6 6.8 <br /> pH(std.units)(field) 7.81 7.48 7.49 7.34 8.68 7 7.08 7.8 7.81 7.72 8.18 7.5 8.28 <br /> Electrical Conductivity(umhos/cm)(field) 294 277 289 275 460 238 266 267 242 277.3 271 264 272 <br /> Turbidity(NTU)(field) 42 120.3 58.0 65.1 2.3 2.1 1.98 19.38 0.8 18.7 2.5 15.1 LOW <br /> Temperature(°C)(field) 18.4 20.8 22.5 21.3 17.1 25.3 24 22.2 20.17 21.8 23.8 20.6 17.7 <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 <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 <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR NR NR NR NR NR <br /> °Analytical results reflect composite samples. <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\Mst, Revision I:6/21/1999 QA/QC <br />