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TABLE 2 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- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW9 05/17/90 7 88 28 23 -2035 000 2 0 093 0 89 <0 5 I20 -- MW9 09/25/90 788 Dry -- __ __ __ -- MW9 12/19/90 7 88 2933 -2145 000 MW9 01/30/91 788 Dry MW9 05/02/91 788 2945 -2157 000 MW9 07/16-17/91 7 88 2960 -2172 a 000 MW9 10/15/91 788 Dry MW9 01/28/92 788 Dry MW9 04/30/92 7 88 2907 -21 19 000 MW9 08/13/92 788 2947 -2159 000 MW9 10/08/92 7 88 Dry MW9 02/23/93 7 88 2836 -2048 000 MW9 05/18/93 788 __ -- -_ -- MW9 08/22/93 788 Not accessible MW9 12/30/93 788 Not accessible MW9 02/17/94 788 Not accessible -- -_ __ MW9 05/10/94 788 26 15 -1827 000 3,100 29 52 89 7,400 -- MW9 08/02/94 7 88 2765 -1977 000 4,900 230 120 490 13,000 -- MW9 11/01/94 788 2797 -2009 000 4,300 270 170 700 12,000 -- MW9 02/17/95 788 2538 -1750 000 2,200 89 100 410 7,100 -- MW9 05/11/95 788 2396 -1608 000 2,500 68 110 490 8,300 -- MW9 08/24/95 788 2439 -1651 000 490 6 0 38 110 1,200 -- MW9 10/19/95 788 2485 -1697 000 840 120 100 320 4,900 79 MW9 02/13/96 788 2255 -1467 000 890 <10 ILO 220 4,400 -- MW9 04/18/96 788 2035 -1247 000 780 220 110 460 5,700 <125 MW9 08/08/96 7 88 2156 -1368 000 510 <10 88 260 2,700 230 MW9 11/04/96 7 88 2194 -14 06 0 00 370 <10 24 26 1,700 160 MW9 02/03/97 788 1751 -9 63 000 320 16 56 160 1,600 230 MW9 05/08/97 657 1725 -1068 000 310 <5 0 39 57 2,600 250 MW9 08/26/97 657 1905 -1248 000 64 <2 0 <2 0 <2 0 1,100 150 MW9 11/11/97 657 1947 -1290 000 31 <1 2 <1 2 <1 2 750 c 170 MW9 11/11/97 657 180* g Nprojects%73942\master%wp\g07O4�3942gw xis Page 19 of 54