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<br /> TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 N PERSHING AVENUE, STOCKTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH Concentration(µg/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (ft MSI) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> RW2 08/19/98 676 <40*
<br /> 11/18/98 1620 -944 000 110 130 280 510 5,300 95
<br /> 03/30/99 1430 -754 000 41 74 217 329 5,720 <20
<br /> 05/05/99 1467 -791 000 63 4 109 263 545 5,380 68 7
<br /> 08/20/99 16 02 -926 000 120 56 1 236 265 4,740 251
<br /> 12/06/99 1635 -959 000 72 41 210 2299 2,500 <5
<br /> 02/29/00 13 76 -700 000 17 4 5 28 164 1,400 <1
<br /> 05/16/00 1390 -714 000 56 14 100 304 1,700 19
<br /> RW3 05/22/90 8 89 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 --
<br /> 12/19/90 3302 -2368 0 61 Not sampled- LPH
<br /> 01/30/91 3373 -24 12 098 Not sampled- LPH
<br /> 05/02/91 32 75 -2347 054 Not sampled- LPH
<br /> 07/16-17/91 3372 -24 49 047 Not sampled- LPH
<br /> 10/15/91 35 27 -2558 1 10 Not sampled- LPH
<br /> 01/28/92 3269 -2370 0 14 Not sampled- LPH
<br /> 04/30/92 3227 -2334 006 Not sampled- LPH
<br /> 08/13/92 3467 -2550 039 Not sampled- LPH
<br /> 10/08/92 3536 -2606 056 Not sampled- LPH
<br /> 02/23/93 3134 -2245 000 4,100 4,300 1,600 8,300 47,000
<br /> 05/18/93 3002 -21 13 000 19,000 22,000 3,100 17,000 90,000 --
<br /> 08/22/93 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 -
<br /> 12/30/93 29 63 -2074 000 18,000 22,000 2,900 15,000 96,000 -
<br /> 02/17/94 2927 -2038 000 9,600 14,000 2,200 9,600 70,000 -
<br /> 05/10/94 28 81 -1992 000 10,000 16,000 2,200 10,000 76,000 -
<br /> 08/02/94 3035 -2146 000 -- -- -- -- --
<br /> 11/01/94 3059 -2170 000 11,000 16,000 2,800 14,000 92,000 --
<br /> 02/17/95 28 08 -19 19 000 9,800 12,000 2,600 11,000 79,000 -
<br /> 05/11/95 2537 -1648 000 7,600 10,000 2,700 12,000 90,000 -
<br /> 08/24/95 2672 -1783 000 9,600 15,000 4,600 20,000 100,000 --
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