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TABLE 1 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 /> No Date (feet ms]) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> RW] 05/08/97 770 1976 -1206 000 430 2,000 860 2,300 18,000 620
<br /> 08/26/97 2051 -1281 000 600 2,600 1,200 3,400 21,000 380
<br /> 11/11/97 21 11 -1341 000 410 1,500 750 1,800 13,000 520
<br /> 11/11/97 <25*
<br /> 03/03/98 15 51 -781 000 320 1,300 660 1,700 11,000 420
<br /> 03/03/98 <33*
<br /> 05/20/98 15 30 -760 000 310 1,500 670 1,800 13,000 760
<br /> 05/20/98 <33*
<br /> 08/19/98 1675 -905 000 340 1,200 630 1,700 18,000 1,100
<br /> 08/19/98 <40*
<br /> 11/18/98 1721 -951 000 250 840 520 1,100 8,200 90
<br /> 03/30/99 15 31 -761 000 197 678 432 967 8,150 <20
<br /> 05/05/99 1566 -796 000 234 833 499 1,270 8,680 58 4
<br /> 08/20/99 1731 -961 000 234 415 409 728 6,450 315
<br /> 12/06/99 1742 -972 000 180 220 310 500 4,300 <5
<br /> 02/29/00 15 05 -7 35 000 280 200 750 1,270 14,000 <1
<br /> 05/16/00 14 88 -7 18 000 280 190 670 1,010 10,000 15
<br /> 09/11/00 1725 -9 55 000 300 240 550 950 9,400 <5
<br /> 12/13/00 1717 -947 000 330 470 1,400 3,210 291000 <120
<br /> RW2 05/22/90 8 13 2940 -2127 000 2,000 6,100 1,800 10,000 51,000 --
<br /> 09/25/90 3079 -22 66 000 1,000 5,200 1,600 8,600 33,000 --
<br /> 12/19/90 3062 -2249 000 940 3,500 860 5,200 16,000 --
<br /> 01/30/91 3108 -2295 000 580 2,300 580 3,600 13,000 --
<br /> 05/02/91 3097 -2284 000 1,600 3,400 1,600 7,900 32,000 --
<br /> 07/16-17/91 3195 -23 82 000 600 1,900 730 3,900 21,000 --
<br /> 10/1519 i 3253 -2440 000 510 2,700 720 3,300 22,000 --
<br /> !1iirojecis173942Vnnasterlwplq 120013942gw xls Page 26 of 43
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