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HISTORICAL SUMMARY OF ANALYTICAL RESULTS FOOTHILL SANITARY LANDFILL Units:m I,unless noted 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 Sampling Date 7/10/97 10/3/97 3/11/98 4/30/98 7/7/98 10/9/98 1/15/99 4/l/99 7/7/99 10/20/99 3/8/00 5/11/00 7/13/00 10/9/00 1/15/01 Ouarterly MonitorinP and Field Parameters Volatile Organic Compounds(ug/1) (EPA Method 8260) <0.03 0.0448• <0.03 <0.06 <0.06 <0.06 Trichloroethene(TCE) <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 1,1-Dichlomethene <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 Chlorofomr <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 Chlorobenzene 2.6 <0.07 <0.07 <0,07 <0.07 <0.07 <0.07 Acetone <1.79 <1.79 <1.79 Napthalene <0.1 <0.1 <0.1 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 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 Total Dissolved Solids 194 216 196 186 202 176 162 165 182 187 180 194 186 184 183 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 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 Electrical Conductivity(umhos/cm)(field) 173 278 224 245 237 251 243 235 236 237 237 242 240 240 264 Turbidity(NTU)(field) 2.69 56.5 l 29.6 4 2.9 LOW 3.25 1.43 1.23 1 4.02 0.49 0.27 2.51 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 Constituents of Concern Parameters Semivolatile Organic Compounds (EPA Method 3520/8270) All Compounds NR NR NR NR NR NR NR NR NR ND NR NR NR NR NR Organochlorine Pesticides and Polychlorinated Biphenyl's (IiPA Method 3510/8080) All Compounds Nit Nit Nit Nit Nit Nit Nit Nit Nit NO Nit Nit Nit Nit Nit Chlorinated Herbicides (EPA Method 8150A Modified) All Compounds NR NR NR NR NR NR NR NR NR ND NR NR NR NR NR -Tracc Concentration [I]This analytical result appears to be anomalous and therefore was not used in statistical evaluation procedures. ND=Not Detected NR=Not Required N:\XLS\0939\00408\Hist, Revision 1:4/4/01 QA/QC