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® ® ® M ® r ® M - ® ® M M ® ® ® r <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -3 <br />Sample Type: Air <br />Sampling Date <br />10/1/03 <br />2/11/04 <br />5/6/04 <br />7/22/04 <br />11/15/04 <br />2/14/05 <br />10/3/05 <br />6/30/06 <br />11/29/06 <br />3/13/07 <br />8/20/07 <br />1/29/08 <br />7/29/08 <br />Toluene <br />6.6 <br />24 <br />219 <br /><0.5 <br />274 <br />11 <br />25 <br />6.4 <br />82 <br />-<O. 5 <br /><0.5 <br />2.5 <br />3.8 <br />trans-1,3-Dichloropropene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />1,1,2-Trichloroethane<0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />2-Hexanone <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><4.6 <br />Dibromochloromethane <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><1.1 <br />1,2-Dibromoethane (EDB) <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />Chlorobenzene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />Ethylbenzene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0 5 <br /><0.5 <br /><0.5 <br />28 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />Bromoform <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><11 <br />Cumene <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><1.1 <br />1,1,2,2 -Tetrachloroethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />Propylbenzene <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><11 <br />4-Ethyltoluene <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br /><1.1 <br />1,3,5-Trimethylbenzene <br />0.9 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />3.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br />ne <br />alpha-Chlorotoluene NT NT NT NT NT NT NT NT NT NT NT NT <1.1 <br />Hexachlorobutadiene 1.4* <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><4.6 <br />Benzyl Chloride 1.4* <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br />NT <br />n-butylbenzene NT <br />NT <br />NT <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT <br />sec-butylbenzene NT <br />NT <br />NT <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT <br />tert-butylbenzene NT <br />NT <br />NT <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />NT <br />NR = Not Required <br />NT = Not Tested <br />* = Trace Concentration <br />{1) Parameter also detected in one or more quality <br />control blanks. <br />