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Table 2 GROUNDWATER ELEVATIONS AND SAMPLE ANALYTICAL RESULT S Ruii Grocery 4491 West Durham Ferry Road Tracy C,dhforma TBA,ETBE, 1,2-DCA, Sample Date TOC DTW GWE LNAPL TPHg B T E X MTBE DIPE,TAME EDB No (feet) (feet) (feet) feet ( ( ) ( ) ( ) (pg/L) ( ) ( ) ( L) HP-1 10/20/93 --- --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- --- --- HP-2 10/20/93 --- --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- --- --- HP-3 10/20/93 --- --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- --- --- HP-4 10/20/93 --- --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- - --- HP-5 10/20/93 - - --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- --- --- HP-6 10/20/93 --- --- --- 000 <50 <0 3 <0 3 <0 3 <0 3 --- --- --- MCLs --- --- --- --- --- --- 1 150 700 1,750 13 -- --- Notes- TOC Top of casing referenced to mean sea level DTW Depth to water GWE Ground water elevation(corrected for presence of LNAPL,if applicable) LNAPL Light Non-Aqueous Phase Liquid gasoline TPHg Total petroleum hydrocarbons as gasoline by EPA Method 8015(CA LUFT modified) BTEX Benzene,toluene,ethylbenzene and total xylenes by EPA Method 8020 or 8260 MTBE Methyl tert-butyl ether by EPA Method 8260(*indicates by EPA Method 8020) TBA,ETBE,DIPE,TAME Tert-butanol,Ethyl tert-butyl ether,Di-isopropyl ether,Tert-amyl methyl ether by EPA Method 8260 1,2-DCA,EDB 1,2-dichloroethane, 1,2-dibromoethane by EPA Method 8260 <50 Not detected in concentrations exceeding the indicated method detection lima --- Not tested,not measured µg/L Micrograms per liter (1) Samples unpreserved and 7 day holding period exceeded,samples analyzed 13 days after collection (2) Water sample collected from RW-1 after approximately 18 hours of pumping at 5 gpm A Result within quantitation range,chromatographic pattern not typical of fuel MCLS California Maximum Contaminant Levels(primary)for drinking water Page 10 of 10