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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/I, unless noted <br />Sample Designation <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 <br />MW -3 Page 10 of 22 <br />Sampling Date <br />1/4/1996 <br />4/2/1996 <br />7/9/1996 <br />10/2/1996 <br />1/16/1997 <br />4/10/1997 <br />7/10/1997 <br />10/3/1997 <br />3/11/1998 <br />4/30/1998 <br />7/7/1998 <br />10/9/1998 <br />1/15/1999 <br />Quarterly Monitoring and Field Parameters <br />Volatile Organic Compounds (ug/1) <br />Methylene Chloride <br />Trichloroethene (TCE) <br />trace <br /><0.4 <br /><0.4 <br />trace <br /><0.5 <br />0.86 <br /><0.4 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br />4 <br />1, 1 -Dichloroethene <br /><0.4 <br /><0.4 <br /><0.4 <br />trace <br /><0.4 <br /><0.72 <br /><0.72 <br /><0.72 <br /><0.72 <br /><0.72 <br /><0.72 <br />Chloroform <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br />2.6 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br /><0.83 <br />Chlorobenzene <br />Chloride <br />9 <br />9 <br />9 <br />9 <br />7.3 <br />7.5 <br />7 <br />8.7 <br />11 <br />11 <br />10 <br />l0 <br />10.2 <br />Nitrate -Nitrogen <br />3.3 <br />3.9 <br />3.3 <br />4.1 <br />3 <br />3.6 <br />2.6 <br />3.3 <br />3.9 <br />4.2 <br />4.2 <br />4.2 <br />0.23 <br />Total Dissolved Solids <br />250 <br />250 <br />230 <br />230 <br />230 <br />178 <br />220 <br />246 <br />216 <br />215 <br />229 <br />198 <br />173 <br />Sulfate <br />6 <br />5 <br />6 <br />6 <br />4.9 <br />4.5 <br />5 <br />5.5 <br />6 <br />6.1 <br />6.2 <br />6 <br />6.8 <br />pH (std. units) (field) <br />7.81 <br />7.48 <br />7.49 <br />7.34 <br />8.68 <br />7 <br />7.08 <br />7.8 <br />7.81 <br />7.72 <br />8.18 <br />7.5 <br />8.28 <br />Electrical Conductivity (umhos/cm) (field) <br />294 <br />277 <br />289 <br />275 <br />460 <br />238 <br />266 <br />267 <br />242 <br />277.3 <br />271 <br />264 <br />272 <br />Turbidity (NTU) (field) <br />42 <br />120.3 <br />58.0 <br />65.1 <br />2.3 <br />2.1 <br />1.98 <br />19.38 <br />0.8 <br />18.7 <br />2.5 <br />15.1 LOW <br />Temperature (°C) (field) <br />18.4 <br />20.8 <br />22.5 <br />21.3 <br />17.1 <br />25.3 <br />24 <br />22.2 <br />20.17 <br />21.8 <br />23.8 <br />20.6 <br />17.7 <br />Constituents of Concern Parameters <br />Semivolatile Organic Compounds <br />(EPA Method 3520/8270) <br />All Compounds <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 />Organochlorine Pesticides and Polychlorinated Biphenyl's <br />(EPA Method 3510/8080) <br />All Compounds <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 />Chlorinated Herbicides <br />(EPA Method 8150A Modified) <br />All Compounds <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 />* = Trace Concentration <br />[1] This analytical result appears to be anomalous <br />and therefore <br />was not used in statistical <br />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 M ® M M M M M <br />