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� ✓� � i i i i i i i• � l• � I♦ 1♦ � 1♦ TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration ( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH- MTBE UVB-MW2 12/13/00 775 1741 -966 000 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 44 UVB-MW2 06/21/01 775 1793 -10 18 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 19 13 -1138 000 24 36 13 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1992 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 350 l 1 0 410 1,760 h 550 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 774 1855 -1081 000 18 5 07 1 1 14 108 h 1 3 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 0.00 45,8 2.3 11.0 12.0 1,210 h 236 UVB-MW2 09/10/02 774 <0 5* a Water in well may be residual water in end cap b Unidentified hydrocarbons present c Hydrocarbons ranging from C6-Cl2 identified on the gasoline sample chromatogram d Analytical results maybe incorrect due to possible mislabeling of samples for UVB-MW 1 and UVB-MW2 Resampled on 2 October 1997 e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram f Analyzed outside of hold time g Grab groundwater sample collected from well h TPH-g results beginning March 2002 include MTBE I Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results LPH Liquid-phase hydrocarbons TPH-g Total Petroleum Hydrocarbons as gasoline MTBE Methyl t-butyl ether * Analyzed by EPA Method 8260 -- Not measured,not sampled,or not analyzed µg/L Micrograms per liter Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline Data from 1187 from HLA glpro3ects1739421masierlwp1g09O213942gw xis Page 41 of 41