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m4r m = = m m � mb � � � � � � � 4F TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH � Concentration(Pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW l 06/21/01 770 1770 -1000 000 130 300 530 1,450 17,000 24 RWI 06/21/01 770 <5* RWI 09/20/01 770 1886 -11 15 0 01 -- -- -- -- -- -- R W 1 12/04/01 7 68 1864 -1096 000 -- -- -- -- -- -- R W 1 03/05/02 7 68 1780 -10 12 000 148 820 214 298 3,360 h 970 RWI 03/05/02 7 68 <0 5* RWI 06/11/02 7 68 1828 -1060 000 75 5 250 120 950 1,640 h 235 RWI 06/11/02 768 <0 5* RWI 09/10/02 7 68 1950 -1182 000 634 313 121 116 2,750 h 295 RW 1 09/10/02 7 68 <0 5* IM t 12/18/02 7 68 1927 -1159 000 130 910 228 255 2,400 h 240 RWI 12/18/02 7 68 <5* RWI 03/24/03 768 1875 -1107 000 -- -- -- -- --RWI 03/25/03 768 -- -- -- 105 698 163 229 3,690 h 208 RWI 03/25/03 768 <0 5* R W 1 06/11/03 768 18 87 -11 19 000 180 115 187 251 4,740 h 706 RWI 06/11/03 768 <05* RM 1 09/17/03 768 2026 -12 58 0 00 176 127 298 590 5,300 h 696 RWI 09/17/03 768 <0 5* RNV1 12108/03 768 2025 -1257 0 00 147 897 239 349 5,140 h 442 RW1 12/08/03 768 <0 5* RW2 05/22/90 813 2940 -2127 000 2,000 6,100 1,800 10,000 51,000 -- RW2 09/25/90 8 13 3079 -2266 000 1,000 5,200 1,600 8,600 33,000 -- RW2 12/19/90 8 13 3062 -2249 000 940 3,500 860 5,200 16,000 RW2 01/30/91 8 13 31 08 -2295 000 580 2,300 580 3,600 13,000 -- RW2 05/02/91 8 13 3097 -2284 000 1,600 3,400 1,600 7,900 32,000 -- RW2 07116-17/91 8 13 3195 -23 82 0 00 600 1,900 730 3,900 21,000 -- RW2 10/15/91 8 13 3253 -2440 000 510 2,700 720 3,300 22,000 -- RW2 01/28/92 8 13 3076 -2263 0 00 260 1,200 590 2,500 17,000 -- RW2 04/30/92 8 13 Not accessible -- -- -- -- -- -- RW2 08/13192 8 13 3247 -2434 000 130 630 280 1,100 8,500 -- j b Iprojecss%739421maslerlwp\q I20313942gw xis Page 32 or 51