ARCHIVED REPORTS_SEMI ANNUAL GROUNDWATER MONITORING OCTOBER 2010

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OEM WM maim M M M M M Table 6 Historical Groundwater Analytical Results-Volatile Oxygenate Compounds Chevron Facility#306620 (Former Unocal#5099) 5606 Pacific Avenue Stockton,California I ...... . ... ............... . .... a..:.:.:..... ).$.:.:..:...- ... ..........::.:..... .................... ......................................... ... . 01: 1�1i4j . -$W. —�; 00Wf: ::34A ....... ............I....... .. .. ................ ..... .... . . )ATE & l. MW-3 02/08/95 480 06/21/95 400 09/19/95 390 12/19/95 270 03/11/96 200 <5000 06/19/96 200 <6000 09/17/96 120 <3000 12/05/96 39 <2000 03/24/97 11 <600 06/18/97 50 <200 09/16/97 <5 <400 12/10/97 <50 -- - -- -- -- -- <400 03/18/98 <100 <100 <100 176 636 <100 <100 221 <200 06/24/98 <200 <100 163 297 1,210 <100 <100 289 <200 09/16/98 <100 - <100 <100 229 923 <100 <100 203 <200 12/22/98 <100 - <100 <100 148 548 <100 <100 178 <200 03/18/99 <100 - <100 <100 <300 315 <100 <100 <100 <200 06/17/99 <100 - <100 <100 136 343 <100 <100 140 <200 09/16/99 <100 <100 <100 182 473 <100 <100 <100 <200 12/13/99 <100 <100 <100 505 1,930 <100 <100 526 <200 06/15/00 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <2.0 09/19/00 <1 <1 <1 <1 <1 <1 <1 <1 <2 12/13/00 <10 16 <10 291 1,010 <10 <10 114 - - <20 03/27/01 <100 <100 <100 394 1,300 <100 <100 133 <10 <10 <200 05/30/01 <100 <100 166 264 1,010 <100 <100 225 <100 <100 <200 09/25/01 <200 <200 <200 210 840 <200 <200 <00 -- -- <400 12/04/01 <1.0 - - -- - -- 130 - <1.0 03/03/02 <17 - <17 <17 23 <17 <17 <17 <42 <1.0 06/10/02 <120 - <120 <120 200 830 <120 <120 310 <25 09/24/02 <5.0 - 24 58 120 480 <5.0 <5.0 160 <5.0 12/02102 <10 33 88 160 640 <10 11 190 <40 02/20/03 <10 37 90 150 660 <10 10 250 <10 05104103 <50 <50 120 160 550 <50 <50 <50 <50 08/03/03 <0.5 <0.5 <0.5 <0.5 1.2 <0.5 <0.5 <1.0 <0.5 12/23/03 <25 69 230 330 1,400 <25 <25 <350 <25 60146576 5 of 51 AECOM