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Table 2 GROUND WATER ELVATIONS AND SAMPLE ANALYTICAL RESULTS Ruiz Grocery Store 4491 West Durham Ferry Road Tracy,California tSample Collection TOC DTW GWE SPH TPHg B T E X MTBE No Date (feet) (feet) (feet) (feet) ( ) ( ) ( ) ( ) ( ) ( ) RW-1 10/19/95 --- 1505 --- 000 18,000 2,000 1,500 370 1,500 1,400 12/19/95 - 1646 --- --- --- --- - - --- 12/20/95 (3) --- --- --- 000 220 12 23 <0 5 23 410 1/5/96(l) 1679--- --- -- -- --- --- --- --- --- 712196 155 30 10/18/96 --- 1531 --- --- --- --- --- --- --- --- 8120/98 9907 --- --- --- --- --- --- — — -- Domestic 9/4/91 000 <50 <0 5 <0 5 <0 5 <0 5 --- Well 1/7/93 --- --- 000 <50 <0 5 <0 5 <0 5 <0 5 --- 417/93 - 000 X50 <0 5 <0 5 <0 5 <0 5 --- 1/5/96(l) 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 7/2/96 -- --- --- 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0 10/18/96 --- --- --- 000 <50 <0 5 <0 5 <0 5 <2 0 <5 0 1122/97 -- == --- 000 <50 <0 5 <0 5 <0 5 <2 0 <5 0 4122/97 000 <50 <0 5 <0 5 <0 5 <2 0 <5 0 7124197 --- --- -- 000 <50 <0 5 <0 5 <0 5 <2 0 <5 0 11/14197 -- --_ _= 000 <50 12 10 07 <2 0 <5 0 1/22198 000 <100 <0 5 <0 5 <0 5 <15 <5 0 5112/98 -- -- -- 000 <50 <0 5 <0 5 <0 5 <0 5 <5 0(5) 8120198 --- --- --- 000 <50 <0 5 <0 5 <0 5 <05 <5 0(5) 11/4198 --- -- --- 000 <50 <0 5 <0 5 <0 5 <05 <5 0(5) 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 --- of _-Top of casing referenced to mean sea level TOC- - Depth to water DTW-- - _ Ground water elevation(corrected for presence of SPH,if applicable) GWE— _ Separate-phase hydrocarbons SPH_ _Total petroleum hydrocarbons as gasoline by EPA Method 8015(CA LUFT modified) TPHg/ - Benzene,toluene,ethylbenzene and total xylenes by EPA Method 8020(CA LUFT modified) BTEX-� Methyl tertiary butyl ether by EPA Method 8020 through 1/22198,EPA Method 8260 thereafter MTBE -/`lot detected in concentrations exceeding the indicated method detection limit <50- Not tested/measured --- Micrograms per liter 9g/L_ Samples unpreserved and 7 day holding period exceeded,samples analyzed 13 days after collection (1) --MTBE by EPA Method 8260= 1,300 gg/L (2) Water sample collected from RW-1 after approximately 18 hours of pumping at 5 gpm (3) In addition to MTBE,39 pg/L of tert-Butanol was detected by Method 8260 (4) - All other fuel oxygenates were not present in concentrations exceeding method detection limits the sample (5) Additional fuel oxygenates(ETBE,TBA,DIPE,TAME)were not detected in concentrations exceeding method detection limits by EPA Method 8240 or 8260 Page 4 of 4