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AMB RIA Table 1. Ground Water Analytical Data - Halogenated Volatile Organic Compounds - Shell-branded Service Station - Incident#98995643 - 1071 North Main St, Manteca, California ` MTBE MTBE Sample Date 1,2-DCA EDB by 8020 by 8260 Ethanol t-Butanol DIPE ETBE TAME Methanol D O 1D Sampled (Concentrations in b) (M ) (MA) i MW-1 04/28/98 --- --- 110 120 <500 <100 <2 0 <20 <20 <10 09 07/28/98 <0 50 <0 50 290 280 <1,250 <250 <5 0 <5 0 <5 0 <10 17 07/28/984°p a <0 50 <0 50 630 440 <1,650 <330 <6 6 <66 <66 <10 17 10/07/98 <2 5 <2 5 2,000 1,700 <8,350 <1,670 <33 <33 <33 <10 It 10/07/98d"p <25 <25 1,100 1,800 <6,250 <1,250 <25 <_25 <25_ <10 11_ 01/28/99 <0 50 <0 50 950 870 <2,500 <500 <10m <10 Y <10 <2.0 _ - 0.9 MW-2 04/28/98 --- --- <2 5 <20 <500 <100 <20 <20 <20 <10 41 04/28/984"P --- --- <2 5 <2 0 <500 <100 <20 <20 <20 <10 41 07/28/98 <050 <0 50 <2 5 <20 <500 <100 <20 <20 <20 <10 76 10/07/98 <0 50 <050 <2 5 <20 <500 <100 <20 <20 <20 <1 0 1 9_ 01/28/99 <0 50 <0 50 <2.5 <20 <500 <100 <2.0 <2 0 <2.0 <2.0 -10 MW-3 04/28/98 --- --- 63 69 <500 <100 <20 <20 <20 <10 10 07/28/98 <0 50 <050 44 45 <500 <100 <20 <20 <20 <10 27 10/07/98 <0 50 <0 50 11 97 <500 <100 <20 <20 <20 <10 14 01/28/99 <0 50 <0.50 <2.5 <2.0 <500 <100 <2.0 <20 <2.0 <2.0 13 Abbreviahons and Notes Notes 1,2-DCA=1,2-dichloroethane by EPA Method 8010 a=Sample re-analyzed past hold time,results should be considered estimates EDB=Ethylene dibromide by EPA Method 8010 <n=Below detection limit of n ppb MTBE=Methyl tert-butyl ether by EPA Methods 8020 and 8260 ---=Not analyzed Ethanol and t-Butanol by EPA Method 8260 DIPE=Di-isopropyl ether by EPA Method 8260 Methanol by modified EPA Method 8015 ETBE= Ethyl tert-butyl ether by EPA Method 8260 TAME=tert-Amyl methyl ether by EPA Method 8260 D O =Dissolved oxygen,measured post-purge ppb=Parts per billion ppm=Parts per million dup=Duplicate sample g 5m l]0711gmlgmi2 xis 1 of t