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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µgfl <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date _ -(feet) (feet) (feet} (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IP2A 09/28/04 -- -- -- -- 570 13,300 2,490 11,600 67,800 h <0 5* <br /> IP2A 12/03/04 -- — -- -- 850 4,470 1,720 8,220 46,300 h 25 0 <br /> IP2A 12/03/04 <25* <br /> IP2B 09/27/04 -- 2170 -- -- -- -- -- -- -- -- <br /> IP2B 09/28/04 -- -- -- -- 460 17,600 3,270 15,200 94,100 h <0 5* <br /> IP2B 12/03/04 -- — — — 595 18,700 4,580 19,700 162,000 h 370 <br /> IP2B 12/03/04 <50* <br /> IMA 09/27/04 -- -- -- -- -- <br /> IP3A 12/03/04 — — -- -- 266 1,300 588 2,830 17,800 h 160 <br /> IP3A 12/03/04 <10* <br /> IP313 09/27/04 -- 2155 <br /> IP3B 09/28/04 -- -- -- -- 3,760 17,200 1,520 7,910 68,700 h <0 5* <br /> IP3B 12/03/04 -- — — 2,930 19,500 2,720 13,500 123,000 h 900 <br /> IP3B 12/03/04 <50* <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-C12 identified on the gasoline sample chromatogram <br /> d Analytical results maybe incorrect due to possible mislabeling of samples for UVB-MW 1 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 /> Analyzed by EPA Method 8260 for ethanol The results are ND<100 µg/L <br /> LPH Liquid-phase hydrocarbons <br /> TPH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl tertiary butyl ether <br /> g 1profects1739421mastcrlwp1g120413942gw xis Page 57 of 58 <br />