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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> LEACHATE <br /> NORTH COUNTY SANITARY LANDFILL <br /> Units:mg/l,unless noted <br /> Sample Designation L-3 L-3 L-3 L-3 L-3 L-3 L-3 L-3 <br /> Sampling Date 1/23/02 4/17/02 7/16/02 10/1/02 1/15/03 1/19/04 10/25/04 10/11/05 <br /> Volatile Organic Compounds(Cont.- <br /> 1,1-Dichlomethane NT NT NT 9.3 NT 5.4 4.2 2.3* <br /> 1,2-Dichloroethane NT NT NT 1.3* NT 0.68 1.1 <1.9 <br /> 1,1-dichloroethene NT NT NT <0.30 NT <0.24 <0.24 <0.24 <br /> cis-1,2-Dichloroethene NT NT NT <0.45 NT <0.31 <0.31 <0.31 <br /> trans-1,2-dichloroethene NT NT NT <0.45 NT <0.26 <0.26 <0.26 <br /> 1,2-dichloropropane NT NT NT <0.35 NT <0.32 <032 <0.32 <br /> 1,3-dichloropropane NT NT NT <0.45 NT <0.40 <0.40 <0.40 <br /> 2,2-dichloropropane NT NT NT <0.95 NT <0.38 <0.38 <0.38 <br /> 1,1-dichloropmpene NT NT NT <0.35 NT <0.38 <0.38 <0.38 <br /> Cis-1,3-dichloropropene NT NT NT <0,40 NT <0.11 <0.11 <0.11 <br /> trans-1,3-dichl_oropropene NT NT NT <0.35 NT <0.10 <0.10 <0.10 <br /> Ethylbenzene NT NT NT 17 NT 10 20 20 <br /> Freon 113 NT NT NT <0.25 NT <0.25 <0.25 <0.25 <br /> Hexachlorobutadiene NT NT NT <0.80 NT <0.50 <0.50 <0.50 <br /> 2-hexanone NT NT NT <4.8 NT <0.26 <0.26 <0.26 <br /> Iodomethane NT NT NT <4.0 NT <0.036 <0.036 <0.036 <br /> lsobutanol NT NT NT <100 NT <0.61 <0.61 <0.61 <br /> Isopropylbenzene NT NT NT 1.1. NT 0.84 0.71 1.1* <br /> p-isopr�ltoluene NT NT NT <0.55 NT <0.40 0.41* <0.40 <br /> Methacrylonitrile NT NT NT <8.7 NT <0.73 <0.73 <0.73 <br /> Methylene Chloride NT NT NT 1.2* NT <0.23 0.32* <0.23 <br /> _Methyl methacrylate NT NT NT <8.0 NT <0.20 <0.20 <0.20 <br /> 4-methyl-2pentanone NT NT NT <5.4 NT <0.17 2.2 <0.17 <br /> Methly tert-butyl ether NT NT NT 98 NT 76 33 6.3* <br /> Naphthalene <0.06 <0.060 NT 7.3 NT 12 24 7.2 <br /> Propionitrile NT NT NT <74 NT <2.7 <2.7 <2.7 <br /> n-propylbenzene NT NT NTT 0.75* NT 0.62 0.45* <1.7 <br /> Styrepe NT NT NT <0.45 NT <0.33 <0.33 <0.33 <br /> 1,1,2,2-tetrachloroethane NT NT NT <0.85 NT <0.59 <0.59 <0.59 <br /> 1,1,1,2-tetrachloroethane NT NT NT <0.40 NT <0.34 <0.34 <0.34 <br /> Tetrachloroethene(PCE) NT NT NT <0.40 NT <0.44 <0.44 <0.44 <br /> Toluene NT NT NT 2.4* NI 1.9 8.4 4.4 <br /> 1,2,3-Trichlorobenzene NI NT NT <0.60 NT <0.46 <0.46 <0.46 <br /> 1,2,4-Trichlorobenzene NT NT NT <0.50 NT <0.41 <0.41 <0.41 <br /> 1,1,2-trichloroethane NT NT NT <0.40 NT <0.43 <0.43 <0.43 <br /> 1,1,1-trichloroethane NT NI NT <0.25 NT <0.19 <0.19 <0.19 <br /> Trichloroethene NT NT NT <0.30 NT <0.36 <0.36 <0.36 <br /> Trichlorofluoromethane NT NT NT <0.35 NT <0.42 <0.42 <0.42 <br /> 1,2,3-trichloropropane NT NT NT <0.40 NT <0.55 <0.55 <0.55 <br /> 1,3,5-trimethylbenzene NT NT NI 1.8* NT 0.57 0.63 <1.8 <br /> 1,2,4-Trimethylbenzene NT NT NT 4.9 NT 3.2 1.6 4.8* <br /> vinyl acetate NT NT NT <8.2 NT <0.94 <0.94 <0.94 <br /> Vinyl Chloride NT NT NT 12 NT 9.4 6.5 4.8 <br /> m/p Xylene NT NT NT 21 NT 6.9 63 NR <br /> o-Xylene NT NT NT 2.6 NT 2.5 13 NR <br /> Total Xylenes NT NT NT 23.6 NT 9.4 76 47 <br /> NR=Not Required <br /> NT=Not Tested <br /> *=Trace Concentration <br /> n:\consuldng\data\shared\projects\xls\qmr\79k791288\NC hist gw and surface 07-28-06 <br />