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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/i, unless noted <br />Sample Designation MW -3 <br />MW -3 <br />MW -3 <br />MW -3 Page 11 of 22 <br />Sampling Date 4/1/1999 <br />7/7/1999 <br />10/20/1999 <br />3/8/2000 <br />(Quarterly Monitoring and Field Parameters <br />Volatile Organic Compounds (ug/1) <br />Methylene Chloride <br /><0.03 <br />2.43 <br />Trichloroethene (TCE) <0.89 <br /><0.89 <br /><0.06 <br />0.227* <br />1,1-Dichloroethene <0.72 <br /><0.72 <br /><0.04 <br /><0.04 <br />Chloroform <0.83 <br /><0.83 <br /><0.06 <br /><0.07 <br />Chlorobenzene <br /><0.90 <br /><0.07 <br /><0.07 <br />Chloride 13 <br />7.1 <br />9.61 <br />9.7 <br />Nitrate -Nitrogen 4.1 <br />2.9 <br />3.5 <br />3.21 <br />Total Dissolved Solids 179 <br />213 <br />220 <br />202 <br />Sulfate 5.1 <br />1.9 <br />6.57 <br />7.24 <br />pH (std. units) (field) 7.77 <br />7.41 <br />7.9 <br />7.36 <br />Electrical Conductivity (umhos/cm) (field) 268 <br />271 <br />270 <br />264 <br />Turbidity (NTU) (field) 1.3 <br />1.01 <br />>200 <br />3.3 <br />Temperature (°C) (field) 19.3 <br />24.6 <br />21.5 <br />17.3 <br />Constituents ofConcem Parameters <br />Semivolatile Organic Compounds <br />(EPA Method 3520/8270) <br />All Compounds NR <br />NR <br />ND <br />NR <br />Organochlorine Pesticides and Polychlorinated Biphenyl's <br />(EPA Method 3510/8080) <br />All Compounds NR <br />NR <br />ND <br />NR <br />Chlorinated Herbicides <br />(EPA Method 8150A Modified) <br />All Compounds NR <br />NR <br />ND <br />NR <br />* = Trace Concentration <br />[ 1 ] This analytical result appears to be anomalous and therefore was <br />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 />