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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,unless noted <br /> Sample Designation LW-1 LW-1 LW-I LW-1 LW-1 LW-I LW-1 LW-1 MW-3 MW-3 MW-3 MW-3 Page 8 of 20 <br /> Sampling Date 10/2/1992 1/5/1993 4/1/1993 7/1/1993 10/4/1993 1/5/1994 7/5/1994 11/28/1994 1/16/1995 4/20/1995 7/6/1995 10/11/1995 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ugA) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) 0.9 <0.43 <0.4 <0.4 <br /> 1,1-Dichloroethene <br /> Chloroform <br /> Chloride 8 9 8 8 8 10 14 9.5 10 8.6 9 9 <br /> Nitrate-Nitrogen 1.2 1.2 1.2 1.1 1.1 1.1 1.1 1.2 3.6 3.8 3.7 3.5 <br /> Total Dissolved Solids 220 240 200 210 220 230 240 182 230 220 179 260 <br /> Sulfate 14 14 14 14 14 <8 16 15 28[1] 4.3 5 6 <br /> pH(std.units)(field) 6.86 6.47 7.37 6.50 6.40 7.42 7.82 7.68 7.74 7.83 7.80 7.62 <br /> Electrical Conductivity(umhos/cm)(field) 329 281 317 315 276 297 300 313 304 275 295 286 <br /> Turbidity(NTU)(field) NR NR NR NR NR NR NR 1.6 100.6 140 136 68 <br /> Temperature(°C)(field) NR NR NR NR NR NR NR 17.3 18.1 19.8 21.5 22.5 <br /> Constituents of Concern Parameters <br /> Semivolatile Organic Compounds <br /> (EPA Method 3520/8270) <br /> All Compounds NR NR NR NR NR NR NR ND 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 ND NR NR NR NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR ND NR NR 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\Mst, Revision 1:6/21/1999 QA/QC <br />