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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG-8 Sample Type:Air Sampling Date 3/13/07 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 8/7/12 1,4-Dioxane NT NT NT <4.1 <650.0 <6.3 <230 NS Bromodichloromethane NT NT NT <1.0 <160.0 <16 <58 NS cis-1,3-Dichloropropene <0.5 <0.5 <0.5 <1.0 <160.0 <16 <58 NS 4-Methyl-2-pentanone NT NT NT <1.0 <160.0 <1.6 <58 NS Toluene <0.5 <0.5 <0.5 2.5 <160.0 4.6 <58 NS trans-1,3-Dichloropropene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS 1,1,2-Trichloroethane <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Tetrachloroethene (PCE) <0.5 <0.5 <0.5 3.1 <160.0 10 <58 NS 2-Hexanone NT NT NT <4.1 <650.0 <6.3 <230 NS Dibromochloromethane NT NT NT <1.0 <160.0 <1.6 <58 NS 1,2-Dibromoethane(EDB) <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Chlorobenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Ethylbenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS m/p Xylene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS o-Xylene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Styrene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Bromoform NT NT NT <1.0 <160.0 <1.6 <58 NS Cumene NT NT NT <1.0 <160.0 <1.6 <58 NS 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS Propylbenzene NT NT NT <1.0 <160.0 <1.6 <58 NS 4-Ethyltoluene NT NT NT <1.0 <160.0 <1.6 <58 NS 1,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS 1,2,4-Tri methyl benzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS 1,3-Dichlorobenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS 1,4-Dichlorobenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS alpha-Chlorotoluene NT NT NT <1.0 <160.0 <1.6 <58 NS 1,2-Dichlorobenzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS 1,2,4-Trichlorobenzene <1.0 <1.0 <1.0 <4.1 <650.0 <6.3 <230 NS Hexachlorobutadiene <1.0 <1.0 <1.0 <4.1 <650.0 <6.3 <230 NS Benzyl Chloride <1.0 <1.0 <1.0 NT NT NT NT NT NR= Not Required NT= Not Tested *=Trace Concentration {1} Parameter also detected in one or more quality control blanks.