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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCRTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH _ Concentration (pglL)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> MW8 05/18/93 7 78 2671 -1893 000 850 5,800 3,400 13,000 53,000
<br /> 08/22/93 7 78 2695 -1917 000 650 4,400 3,500 13,000 52,000 --
<br /> 12/30/93 778 2639 -1861 000 820 6,200 4,200 14,000 50,000 --
<br /> 02/17/94 778 26 10 -1832 000 510 3,800 3,400 13,000 44,000 --
<br /> 05/10/94 778 25 83 -1805 000 520 4,200 3,800 13,000 49,000 --
<br /> 08/02/94 7 78 2729 -1951 000 290 1,900 1,900 7,500 28,000 --
<br /> 11/01/94 778 2764 -1986 000 460 1,700 3,700 14,000 56,000 --
<br /> 02/17/95 778 2500 -1722 000 500 3,900 4,000 15,000 72,000 --
<br /> 05/11/95 778 2242 -1464 000 680 5,900 4,700 19,000 80,000 --
<br /> 08/24/95 778 23 77 -1599 000 520 4,700 4,800 17,000 65,000 --
<br /> 10/19/95 778 2437 -1659 000 150 1,400 2,400 8,600 52,000 <250
<br /> 02/13/96 778 22 15 -1437 000 190 2,100 2,600 10,000 57,000 --
<br /> 04/18/96 778 1980 -1202 000 130 1,700 2,400 9,400 43,000 <125
<br /> 08/08/96 778 21 11 -1333 000 200 2,700 3,300 13,000 46,000 <250
<br /> 11/04/96 778 21 55 -1377 000 160 1,700 2,700 9,600 48,000 <250
<br /> 02/03/97 778 1678 -900 000 <100 1,400 2,500 9,900 42,000 <120
<br /> 05/08/97 645 1666 -1021 000 110 880 2,100 7,800 41,000 120
<br /> 08/26/97 645 1846 -1201 000 93 950 2,200 7,500 35,000 150
<br /> 11/11/97 645 1898 -1253 000 <50 700 2,500 9,100 36,000 <250
<br /> 11/11/97 645 69*
<br /> 03/03/98 645 1302 -657 000 <50 780 1,900 6,500 26,000 <250
<br /> 03/03/98 645 <100*
<br /> 05/20/98 645 1336 -6 91 000 71 200 2,000 4,600 31,000 <125
<br /> 05/20/98 645 43*
<br /> 08/19/98 645 14 91 -846 000 77 1,300 2,300 7,800 31,000 310
<br /> 08/19/98 645 <100*
<br /> 11118(98 645 15 15 -870 000 38 220 2,900 7,100 27,000 <125
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