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.�■ � ..i 1� .� � s �■li TABLE 1 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- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW4 02/13/96 923 2623 -1700 000 2,200 13,000 2,200 9,700 78,000 -- 04/18/96 923 23 76 -1453 000 1,900 9,200 2,100 8,400 62,000 <500 08/08/96 923 2491 -1568 000 730 2,500 970 2,900 15,000 <125 11/04/96 923 2528 -1605 000 1,600 5,200 1,300 4,900 36,000 <250 02/03/97 9 23 2140 -12 17 000 1,700 6,500 1,900 7,200 42,000 1,300 05/08/97 7 86 2005 -12 19 000 540 1,500 720 2,200 16,000 56 08/26/97 7 86 2151 -13 65 000 98 180 140 340 2,600 56 11/11/97 7 86 22 12 -1426 goo 260 350 320 570 4,100 98 03/03/98 7 86 1685 -899 000 1,500 4,600 2,100 6,000 38,000 1,100 03/03/98 786 <67* 05/20/98 786 1611 -825 000 450 460 600 890 7,400 400 05/20/98 786 <6 7* 08/19/98 786 1751 -965 000 130 240 210 580 3,100 90 08/19/98 7 86 <12* 11/18/98 7 86 1798 -10 12 000 300 480 400 970 5,600 <25 03/30/99 786 -- __ _- __ 05/05/99 7 86 08/20/99 7 86 12/06/99 7 86 02/29/00 786 -- -- _- -_ -- -- 05/16/00 786 1520 -734 000 5 6 57 220 363 2,500 21 09/11/00 786 1795 -1009 000 5 7 5 8 17 7 7 550 <0 5 12/13/00 7 86 1785 -999 000 5 6 088 17 4 4 820 <0 5 03/08/01 7 86 17 10 -924 000 <0 5 1 1 3 5 139 640 5 5 06/21/01 786 1833 -1047 000 3 6 081 13 2 51 350 64 06/21/01 7 86 <5* SWI 02/17/94 -- Not accessible since 02/17/94 02/17/95 -- 2801 Air sparging well--samples not collected 05/11/95 -- -- Air spargtng well--samples not collected 08/24/95 -- -- Air spargtng well--samples not collected 10/19/95 -- -- Air spargmg well--samples not collected 02113/96 -- -- Air spargtng well--samples not collected L,tpro3ects1739421masterlwp\g60113942gw xEs Page 28 of 37