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HISTORICAL SUMMARY OF ANALYTICAL RESULTS FOOTHILL SANITARY LANDFILL Units:mg/I,unless noted Sample Designation MW-1 MW-I MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 MW-1 Page 3 of 20 Sampling Date 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 4/1/1999 Quarterly Monitoring and Field Parameters Volatile Organic Compounds(ugA) (EPA Method 8260) Trichloroethene(TCE) <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 <0.89 1,1-Dichloroethene <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 <0.72 Chloroform <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 <0.83 Chloride 6 6 4.7 4.7 4.7 6.1 8 6.8 6.5 6.4 0.23 8.2 Nitrate-Nitrogen 2.3 2.9 2.1 2.4 2.3 2.4 3.4 2.8 12 2.8 2.3 2.6 Total Dissolved Solids 250 210 225 187 194 216 196 186 202 176 162 165 Sulfate 6 7 4.9 5.1 4.8 6 6.5 6.6 6.4 6.5 6.5 5.9 pH(std.units)(field) 7.65 7.25 9.28 7.65 7.83 7.93 7.97 8.03 8.22 6.93 8.37 7.08 Electrical Conductivity(umhos/cm)(field) 257 245 610 153 173 278 224 245 237 251 243 235 Turbidity(NTU)(field) 51.9 16.9 2.27 3.47 2.69 56.5 1 29.6 4 2.9 IOW 3.25 Temperature(°C)(field) 22.3 21.8 15.2 24.4 21.5 22 19.5 20.6 22.7 20.8 18 20.8 Constituents of Concern Parameters Semivolatile Organic Compounds (EPA Method 3520/8270) All Compounds NR NR NR NR NR NR NR NR NR NR NR NR Organochlorine Pesticides and Polychlorinated Biphenyl's (EPA Method 3510/8080) All Compounds NR NR NR NR NR NR NR NR NR NR NR NR Chlorinated Herbicides (EPA Method 8150A Modified) All Compounds NR NR NR NR NR NR NR NR NR NR NR NR •Analytical results reflect composite samples. [1]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 1:6/21/1999 QA/QC ® ® ® ® M = ® ® = M ® M M ® ® = M M