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s� wi �� �� ■A■�� �s a■� �� iww� �� � �� awe �r �■! �� s �� <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHMG AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration /L <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE <br /> V4 03/24/03 812 1890 -1078 000 -- -- -- -- -- -- <br /> V4 03/25/03 812 -- -- 700 2,300 3,390 17,100 102,000 h 130 <br /> V4 03/25/03 812 <10* <br /> V4 06/11/03 8 12 1908 -1096 Sheen 738 22,700 3,340 14,400 87,500 h 838 <br /> V4 06/11/03 812 <5* <br /> V4 09/17/03 8 12 2047 -1235 0 00 590 17,800 3,330 14,900 84,500 h 130 <br /> V4 09/17/03 812 <5* <br /> V4 12/08/03 8 12 2046 -1233 001 675 21,000 3,980 16,900 107,000 h <25 <br /> V4 03/02/04 8 12 1894 -1082 000 690 20,000 4,200 18,800 99,700 h 1,100 <br /> V4 03/02/04 812 <25* <br /> V4 06/28/04 8 12 2007 -1195 000 -- -- — — — <br /> V4 06/29/04 8 12 — — -- 279 17,300 3,910 16,600 106,000 h <0 5 <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-C 12 identified on the gasoline sample chromatogram <br /> d Analytical results may be incorrect due to possible mislabeling of samples for UVB-MW I and UVB-MW2 Resampled on 2 October 1997 <br /> e Gas and unidentified hydrocarbons ranging from C6-C8 identified on the gasoline sample chromatogram <br /> f Analyzed outside of hold time <br /> g Grab groundwater sample collected from well <br /> h TPH-g results beginning March 2002 include MTBE <br /> I Water sample taken from SW2 on 17 February 1994 was labeled as AS2 on chain of custody and laboratory results <br /> J Analyzed by EPA Method 8260 for ethanol The results are ND<100 gg/L <br /> LPH Liquid-phase hydrocarbons <br /> TPH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl tertiary butyl ether <br /> * Analyzed by EPA Method 8260 <br /> -- Not measured,not sampled,or not analyzed <br /> lig/L Micrograms per liter <br /> Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline <br /> g Vrojects1739421masterlwp1gD70413942gw xis <br /> Page 53 of 54 <br />