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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> FOOTHILL SANITARY LANDFILL <br /> Units:mg/I,unless noted <br /> Sample Designation MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MWA Page 2 of 20 <br /> Sampling Date 10/2/1992 1/5/1993 7/1/1993 10/4/1993 1/5/1994 4/5/1994 7/5/1994 11/28/1994 4/21/1995 7/6/1995 10/11/1995 1/5/1996 4/2/1996 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> (EPA Method 8260) <br /> Trichloroethene(TCE) <br /> 1,1-Dichloroethene <br /> Chloroform <br /> Chloride 6 6 6 5 7 5 7 6.3 4.9 5 6 6 5 <br /> Nitrate-Nitrogen 2.5 2.5 2.3 2.4 1.3 2 1.4 2.4 2.6 2.4 2.3 2.1 2.5 <br /> Total Dissolved Solids 180 220 200 200 210 220 220 186 200 160 240 230 230 <br /> Sulfate 7 7 6 6 <8 <8 10 6.5 4.9 6 7 6 6 <br /> pH(std.units)(field) 7.66 8.02 7.46 6.79 7.80 7.62 7.89 8.48 7.89 7.81 7.86 7.97 7.35 <br /> Electrical Conductivity(umhos/cm)(field) 307 300 301 248 305 294 281 287 245 263 269 246 236 <br /> Turbidity(NTU)(field) NR NR NR NR NR NR NR 36.9 18 34 14 11 20.8 <br /> Temperature(°C)(field) NR NR NR NR NR NR NR 13.7 20.2 22.5 21.5 18.6 21.3 <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 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 NR <br /> Chlorinated Herbicides <br /> (EPA Method 8150A Modified) <br /> All Compounds NR NR NR NR NR NR NR NO NR 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 /> NO=Not Detected <br /> NR=Not Required <br /> N.\XLS\0939\00408\Hist, Revision 1:6/21/1999 QA/QC <br /> ® ® ® M M = M ® = = ® M M M ® M M <br />