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�� t! � fid a� f� � � >• !• ��t• � TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(Eg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene -Toluene benzene Xylenes TPH-g MTBE V4 09/20/01 822 1929 -1105 001 - -- -- -- -- V4 12/04/01 812 1906 -1094 000 -- -- -- -- -- -- V4 03/05/02 8 12 1690 -878 000 4,480 17,200 2,800 14,100 60,600 h <25 V4 06/11/02 8 12 1851 -1039 000 900 19,600 3,420 15,700 99,400 h 100 V4 06/11/02 812 <50* V4 09/10/02 812 1975 -1163 Sheen 890 11,000 3,510 16,600 106,000 h <50 V4 12/18/02 8 12 1949 -1136 000 840 22,900 3,280 16,500 96,200 h 520 V4 12/18/02 812 <100* V4 03/24/03 8 12 1890 -1078 000 -- -- -- -- -- -- V4 03/25/03 812 -- -- -- 700 2,300 3,390 17,100 102,000 h 130 V4 03/25/03 812 <10* V4 06/11/03 8 12 1908 -1096 Sheen 738 22,700 3,340 14,400 87,500 h 838 V4 06/11/03 812 <5* V4 09/17/03 812 2047 -1096 000 590 17,800 3,330 14,900 84,500 h 130 V4 09/17/03 812 <5* a Water in well may be residual water in end cap b Unidentified hydrocarbons present c Hydrocaibons ranging from C6-C12 identified on the gasoline sample chromatogram d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MW1 and UVB-MW2 Resampled on 2 October 1997 e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram 1 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 LPFI Liquid-phase hydrocarbons TPH-g Total Petioleum Hydiocarbons as gasoline MI BE Methyl tertiary butyl ether * Analyzed by EPA Method 8260 Not measured,not sampled,or not analyzed pg/L Miciograms per liter kill o3Lus17394Rriwsterluplg090313942gw xls Page 46 or 47