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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 MW-1 MW-1 MW-1 Page 3of20 <br /> Sampling Dale 7/10/97 10/3/97 3/11/98 4/30/98 7/7/98 10/9/98 1/15/99 4/1/99 7/7/99 10/20/99 3/8/00 5/11/00 7/13/00 10/9/00 1/15/01 <br /> Quarterly Monitoring and Field Parameters <br /> Volatile Organic Compounds(ug/1) <br /> (FI'A Method 8260) <br /> -:0.0.1 0.I448• «0.0.1 <O,OA «.O.OA «:f),OA <br /> Trichloroethenc(TCL) <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.06 <0.06 <0.06 <0.06 <0.06 <0.06 <br /> 1,1-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.04 <0.04 <0.05 <0.06 <0.06 <0.06 <br /> Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.06 <0.07 0.162 <0.07 <0.07 <0.07 <br /> Chlorobenzene 2.6 <0.07 <0.07 <0.07 <0.07 <0.07 <0.07 <br /> Acetone <br /> Napthalcno <br /> <1.79 <1.79 <1.79 Methyl ter-butyl ether <0.1 <0.1 <0.1 <br /> Toluene <br /> Chloride 4.7 6.1 8 6.8 6.5 6.4 0.23 8.2 6.7 6.09 6.79 6.74 6.03 4.29 6.55 <br /> Nitrate-Nitrogen 2.3 2.4 3.4 2.8 12 2.8 2.3 2.6 2 2.44 2.37 2.51 2.28 3.65 2.7 <br /> Total Dissolved Solids 194 216 196 186 202 176 162 165 182 187 180 194 186 184 183 <br /> Sulfate 4.8 6 6.5 6.6 6.4 6.5 6.5 5.9 6.3 7.43 7.6 7.55 6.48 <0.021 7.02 <br /> PH(std.units)(field) 7.83 7.93 7.97 8.03 8.22 6.93 8.37 7.08 7,77 8.06 7.37 7.52 8.5 6.61 7.41 <br /> Electrical Conductivity(umhos/cm)(field) 173 278 224 245 237 251 243 235 236 237 237 242 240 240 264 <br /> Turbidity(NTU)(field) 2.69 56.5 1 29.6 4 2.9 LOW 3.25 1.43 1.23 1 4.02 0.49 0.27 2.51 <br /> Temperature(°C)(field) 21.5 22 19.5 20.6 22.7 20.8 18 20.8 20.1 21.3 18.2 23.3 20.5 19.8 17.8 <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 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 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 NR NR ND NR NR NR NR NR <br /> '=Trace Concentration I <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\Hist, Revision 1:6/28/01 <br /> QA/QC <br />