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• • i <br /> TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(}tg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- _ <br /> Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IP3B 12/03/04 <50* <br /> IP313 g 03/25/05 822 — -- -- 2,140 18,900 3,500 16,100 103,000 h <25* <br /> IP313 06/22/05 822 -- -- -- -- -- -- -- -- -- <br /> IP313 g 06/23/05 822 -- -- -- 2,200 18,900 3,000 15,700 101,000 h 710 <br /> IP313 06/23/05 822 <10* <br /> IP3B 10/13/05 8.22 -- -- — 2,800 24,000 2,700 15,000 71,000 h <2,500/<100* <br /> IP3B 0 10/13/05 822 — -- -- 3,300* 27,000* 2,800* 15,000* 70,000 h <br /> a Water in well may be residual water in end cap <br /> b Unidentified hydrocarbons present <br /> c Hydrocarbons ranging from C6-Cl2 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<100µg/L <br /> k Analyzed by EPA Method 8260 for ethanol The results are ND<5,000µg/L <br /> 1 Analyzed by EPA Method 8260 for ethanol The results are ND<1,000µg/L <br /> m Analyzed by EPA Method 8260 for ethanol The results are ND<50,000µg/h <br /> n Analyzed by EPA Method 8260 for ethanol The results are ND<500µg/L <br /> o Analyzed by EPA Method 8260 for ethanol The results are ND<20,000µg/L <br /> p Analyzed by EPA Method 8260 for ethanol The results are ND<2,000 µg/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 /> n'L Micrograms per liter <br /> Note Groundwater elevations adjusted for LPH,when present,using an average specific gravity of 0 75 for gasoline <br /> Data from 1187 from HLA <br /> g 1prcjects1739421mastet\wp\q I00513942gw xis Page 58 of 58 <br />