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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 />MW -2 Page 5 of 22 <br />Sampling Date <br />1/5/1993 <br />4/1/1993 <br />7/1/1993 <br />10/4/1993 <br />1/5/1994 <br />4/5/1994 <br />7/5/1994 <br />11/28/1994 <br />1/16/1995 <br />4/21/1995 <br />7/6/1995 <br />10/11/1995 <br />1/5/1996 <br />Quarterly Monitoring and Field Parameters <br />Volatile Organic Compounds (ug/I) <br />Methylene Chloride <br />Trichloroethene (TCE) <br />1, 1 -Dichloroethene <br />Chloroform <br />Chlorobenzene <br />Chloride <br />6 <br />6 <br />6 <br />6 <br />8 <br />5 <br />6 <br />6.6 <br />6 <br />5.1 <br />6 <br />6 <br />6 <br />Nitrate -Nitrogen <br />3.1 <br />3.0 <br />2.9 <br />2.9 <br />1.3 <br />2.0 <br />1.6 <br />2.9 <br />2.9 <br />3.0 <br />2.8 <br />2.6 <br />2.5 <br />Total Dissolved Solids <br />200 <br />180 <br />170 <br />180 <br />190 <br />200 <br />190 <br />162 <br />180 <br />170 <br />130 <br />200 <br />200 <br />Sulfate <br /><5 <br /><5 <br /><5 <br /><5 <br /><8 <br /><8 <br /><8 <br />1.5 <br />trace <br />1.1 <br />trace <br />trace <br /><0.7 <br />pH (std. units) (field) <br />7.47 <br />7.64 <br />7.48 <br />7.10 <br />7.52 <br />7.35 <br />7.56 <br />7.76 <br />7.79 <br />7.66 <br />7.55 <br />7.75 <br />8.30 <br />Electrical Conductivity (umhos/cm) (field) <br />232 <br />226 <br />248 <br />198 <br />250 <br />230 <br />234 <br />242 <br />230 <br />196 <br />212 <br />225 <br />201 <br />Turbidity (NTU) (field) <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />4.2 <br />2.2 <br />8 <br />18 <br />10 <br />7 <br />Temperature (°C) (field) <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />NR <br />15.7 <br />16.7 <br />20.1 <br />22.4 <br />22.0 <br />19.7 <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 />ND <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 />ND <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 />ND <br />NR <br />NR <br />NR <br />NR <br />NR <br />* = Trace Concentration <br />[i] 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 />