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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/I, unless noted <br />Sample Desigttation MW -1 MW -I MW -2 MW -2 MW -2 MW -2 MW -2* MW -2* MW -2* MW -2* MW -2* MW -2 MW -2 M7. W-2 <br />Sampling Date 10/20/1999 3/8/2000 7/10/1989 1/19/1990 4/4/1990 7/13/1990 10/1/1990 1/7/1991 4/2/1991 7/19/1991 10/9/1991 1/10/1992 4/3/1992 7/1/1992 10/2/1992 <br />Ouarterly Monitoring and Field Parameters <br />6 <br />7.1 <br />6.9 <br />Volatile Organic Compounds (ugA) <br />6.5 <br />6.6 <br />Methylene Chloride <br /><0.03 <br />0.0448* <br />Trichloroethene (TCE) <br /><0.06 <br /><0.06 <br />1,1-Dichloroethene <br /><0.04 <br /><0.04 <br />Chloroform <br /><0.06 <br /><0.07 <br />Chlorobenzene <br /><0.07 <br /><0.07 <br />Chloride <br />6.09 <br />6.79 <br />Nitrate -Nitrogen <br />2.44 <br />2.37 <br />Total Dissolved Solids <br />187 <br />180 <br />Sulfate <br />7.43 <br />7.6 <br />pH (std. units) (field) <br />8.06 <br />7.37 <br />Electrical Conductivity (umhos/cm) (field) <br />237 <br />237 <br />Turbidity (NTU) (field) <br />1.23 <br />1 <br />Temperature (°C) (field) <br />21.3 <br />18.2 <br />Constituents of Concern Parameters <br />Semivolatile Organic Compounds <br />(EPA Method 3520/8270) <br />All Compounds ND <br />Organochlorine Pesticides and Polychlorinated Biphenyl's <br />(EPA Method 3510/8080) <br />All Compounds ND <br />Chlorinated Herbicides <br />(EPA Method 8150A Modified) <br />5 <br />6 <br />7.1 <br />6.9 <br />6.1 <br />6.5 <br />6.6 <br />7 <br />6.7 <br />NR <br />Il <br />6 <br />6 <br />0.81 [1] <br />3 <br />3 <br />2.8 <br />3.2 <br />NR <br />NR <br />NR <br />NR <br />3.0 <br />2.8 <br />3.0 <br />3.0 <br />140 <br />152 <br />158 <br />188 <br />169 <br />157 <br />140 <br />200 <br />156 <br />220 <br />170 <br />200 <br />170 <br /><5 <br />1.5 <br />1.4 <br />1.5 <br />1.3 <br />1.4 <br />1.4 <br />1.4 <br />1.4 <br /><8 <br /><8 <br /><5 <br /><5 <br />8.00 <br />7.50 <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />7.67 <br />7.25 <br />7.25 <br />7.82 <br />219 <br />256 <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />247 <br />203 <br />230 <br />260 <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />All Compounds ND NRS NR NR NR NR NR NR NR NR NR NR NR NR NR <br />* = Trace Concentration <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\Hist, Revision 1:3/31/2000 QA/QC <br />® ® ® M M M ® M <br />