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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(pg/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> Number Date feet) (feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> RW3 05/22/90 889 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 --
<br /> RW3 12/19/90 889 3302 -2368 061 Not sampled-LPH
<br /> RW3 01/30/91 889 33 73 -24 12 098 Not sampled-LPH
<br /> RW3 05/02/91 889 3275 -2347 0 54 Not sampled-LPH
<br /> RW3 07/16-17/91 8 89 33 72 -2449 047 Not sampled-LPH
<br /> RW3 10/15/91 889 3527 -2558 1 10 Not sampled-LPH
<br /> RW3 01/28/92 889 3269 -2370 0 14 Not sampled-LPH
<br /> RW3 04/30/92 889 3227 -2334 006 Not sampled-LPH
<br /> RW3 08/13/92 889 34 67 -2550 039 Not sampled-LPH
<br /> RW3 I0/08/92 889 3536 -2606 056 Not sampled-LPH
<br /> RW3 02/23/93 889 3134 -2245 000 4,100 4,300 1,600 8,300 47,000 --
<br /> RW3 05/18/93 8 89 30 02 -21 13 000 19,000 22,000 3,100 17,000 90,000 --
<br /> RW3 08/22/93 889 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 --
<br /> RW3 12/30/93 8 89 2963 -2074 000 18,000 22,000 2,900 15,000 96,000 --
<br /> RW3 02/17/94 889 29 27 -2038 000 9,600 14,000 2,200 9,600 70,000 --
<br /> RW3 05/10/94 889 28 81 -19 92 000 10,000 16,000 2,200 10,000 76,000 --
<br /> RW3 08/02/94 889 3035 -2146 000 -- -- -- -- --
<br /> RW3 11/01/94 8 89 3059 -2170 000 11,000 16,000 2,800 14,000 92,000 --
<br /> RW3 02/17/95 889 28 08 -19 19 000 9,800 12,000 2,600 11,000 79,000 --
<br /> RW3 05/11/95 889 2537 -1648 000 7,600 10,000 2,700 12,000 90,000 --
<br /> RW3 08/24/95 8 89 2672 -1783 000 9,600 15,000 4,600 20,000 100,000 --
<br /> RW3 10/19/95 8 89 2705 -18 16 000 7,000 12,000 3,400 14,000 87,000 <1,000
<br /> RW3 02/13/96 8 89 2484 -1595 000 4,800 5,800 2,100 8,700 59,000 <500
<br /> RW3 04/18/96 889 2245 -1356 000 5,100 6,700 2,600 11,000 78,000 <250
<br /> RW3 08/08/96 8 89 2360 -1471 000 4,200 5,900 2,600 12,000 58,000 <I,250
<br /> RW3 11/04/96 8 89 2394 -15 05 000 4,300 4,300 2,600 11,000 67,000 <250
<br /> RW3 02/03/97 8 89 -- -- -- -- -- -- -- -- --
<br /> RW3 05/08/97 Converted to UVB well
<br /> RW4 01/30/91 923 3480 -2557 000 30,000 41,000 4,500 27,000 170,000 --
<br /> RW4 05/02/91 923 3479 -25 56 000 16,000 34,000 4,200 22,000 110,000 --
<br /> RW4 07/16-17/91 923 3569 -2646 000 12,000 31,000 2,700 14,000 110,000 --
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