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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />FOOTHILL SANITARY LANDFILL <br />Units: mg/I, unless noted <br />Sample Designation <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />MW -2 <br />Page 6 of 22 <br />MW -2 <br />Sampling Date <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 />4/1/1999 <br />Quarterly Monitoring and Field Parameters <br />Volatile Organic Compounds (ug/1) <br />Methylene Chloride <br />Trichloroethene (TCE) <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br /><0.89 <br />1,1-Dichloroethene <br /><0.72 <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 /><0.83 <br /><0.83 <br /><0.83 <br />Chlorobenzene <br />Chloride <br />6 <br />6 <br />6 <br />5 <br />4.7 <br />4.9 <br />7.2 <br />8.2 <br />7.2 <br />7.2 <br />6.7 <br />7.6 <br />9.2 <br />Nitrate -Nitrogen <br />2.9 <br />2.6 <br />3.3 <br />2.5 <br />2.8 <br />3 <br />2.8 <br />3.9 <br />3.3 <br />3.2 <br />3.3 <br />3.5 <br />3.2 <br />Total Dissolved Solids <br />220 <br />220 <br />180 <br />210 <br />199 <br />180 <br />204 <br />183 <br />159 <br />188 <br />180 <br />157 <br />145 <br />Sulfate <br /><0.7 <br />2 <br />2 <br />1.4 <br />1.4 <br />1.4 <br />1.8 <br />1.9 <br />2 <br />2 <br />2 <br />2.2 <br />1.8 <br />pH (std. units) (field) <br />7.31 <br />7.50 <br />6.95 <br />8.73 <br />7.25 <br />7.84 <br />7.69 <br />7.55 <br />7.34 <br />7.14 <br />8.27 <br />8.16 <br />7.7 <br />Electrical Conductivity (umhos/cm) (field) <br />200 <br />207 <br />201 <br />870 <br />415 <br />130 <br />217 <br />176 <br />257.9 <br />209 <br />198 <br />199 <br />196 <br />Turbidity (NTU) (field) <br />6.8 <br />5.1 <br />10.5 <br />3.4 <br />2.8 <br />2.42 <br />40 <br />1.2 <br />22.6 <br />2.1 <br />1.7 <br />LOW <br />1.46 <br />Temperature (°C) (field) <br />20.6 <br />21.9 <br />20.8 <br />14.1 <br />24.4 <br />22.7 <br />21.5 <br />20.4 <br />20.1 <br />22.4 <br />20.4 <br />19.7 <br />19.4 <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 />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 />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 />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 />