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• • s <br /> Table 1 <br /> GROUND WATER ELEVATIONS AND SAMPLE ANALYTICAL RESULTS <br /> Ruiz Grocery Store <br /> 4491 West Durham Ferry Road <br /> Tracy,California <br /> I <br /> Sample Collection TOC DTW GWE SPH T?Hg B T E X MTBE <br /> No. Date (feet) (feet) (feet) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> Domestic 9/4/91 --- --- -- 000 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 <br /> well 1/7/93 --- --- --- 000 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 — <br /> 4/7/93 -- --- - - 000 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- <br /> 1/5/96 — --- --- 000 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 0 <br /> 7/2/96 --- — --- 000 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 0 <br /> Notes: <br /> TOC Top of casing referenced to mean sea level <br /> DTW Depth to water <br /> GWE Ground water elevation <br /> SPH Separate-phase hydrocarbons <br /> TPHg Total petroleum hydrocarbons as gasoline by EPA Method 8015(CA LUFT modified) <br /> STEX Benzene,toluene,ethylbenzene and total xylenes by EPA Method 8020(CA LUFT modified) <br /> MTBE Methyl tertiary butyl ether by EPA Method 8020 <br /> ND<50 Not detected in concentrations exceeding the indicated method detection limit <br /> Not tested/measured <br /> ppb Parts per billion <br /> Corrected for presence of separate-phase hydrocarbons <br /> ** Water sample collected from RW-1 after approximately 18 hours of pumping at 5 gpm <br /> # Emulsified SPH observed <br /> I <br /> I <br /> Page 4 of 4 <br />