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Tab Groundwater Monitoring AVand Analytical Results Chevron Service Station#9-6171 6633 Pacific Avenue Vertical Measurements are in feet Stockton,California Analytical results are in parts per billion(ppb) Well Ground Depth DATE Head Water TO TIPH- 13enzene Toluene Ethyl- Xylenes MTBE EDB DIESEL Motor Oil TOG Elev, Elev Water Gasoline Benzene MW-3 09/05/90 1267 -4233 5500 <50 <0 5 <05 <0 5 <0 5 <0 2 --11/29/90 1267 -4260 55 27 <50 <0 5 <05 <05 <0 5 -- 03/14/91 1267 -4286 5553 <50 <0 5 <05 <0 5 <0 5 - - 06/06/91 1267 -4272 55 39 <50 <05 <05 <05 <05 08/29/91 1267 -4336 5603 <50 <0 5 <05 <05 <0 5 -- - - -- 12/06/91 1267 -4321 55 88 500 120 80 12 45 -- 03/12/92 1267 -4093 5360 <50 <0 5 <0 5 <05 <0 5 06/11/92 1267 -4331 5598 50 2 7 4 2 08 86 09/03/92 1267 -43 51 5618 <50 <0 5 <05 <05 <05 12/17/92 1267 -4244 55 11 200 2 7 3 9 3 8 26 03/17/93 1267 -4057 5324 <50 2 0 0 9 <0 5 2 0 06/28/93 1267 -39 14 5181 <50 0 7 0 8 <05 10 09/15/93 12 67 -3968 5235 -- -- -- -- -- 09/29/93 1267 -- <50 2 0 5 0 10 6 0 12/29/93 1267 -3851 51 18 <50 2 0 3 0 10 5 0 03/24/94 1267 -37 61 5028 <50 <1 0 2 0 1 2 5 5 06/16/94 1267 -3562 4829 <50 1 1 2 6 09 5 1 10/04/94 1267 -3652 4919 <100 <05 <1 0 <1 0 <2 0 11/08/94 1267 -3688 4955 <50 <0 5 <0 5 <0 5 <0 5 -- 03/14/95 1267 -3502 47 69 <50 <05 <05 <05 <0 5 05/30/95 1267 -3363 4630 <50 <0 5 <05 <05 <0 5 -- 08/20/95 1267 -3378 4645 <50 <0 5 <0 5 <05 <0 5 <2 5 11/05/95 1267 -3337 4604 130' <0 5 14 <0 5 <0 5 -- 02/12/96 1267 -3122 4389 90' <0 5 <0 5 <05 <0 5 -- 05/12/96 1267 -2874 4141 150' <0 5 <0 5 <0 5 <0 5 <2 5 08/12-13/96 1267 -2912 4179 1,200' <5 0 <5 0 <5 0 <5 0 <25 11/11-12196 1267 -28 65 4132 180' <0 5 0 82 <0 5 <0 5 <2 5 - 02/24/97 12 67 -2584 3851 300' <0 5 <0 5 <0 5 <0 5 <2 5 -- -- 07/20/97 1267 -25 90 3857 120' <0 5 <0 5 <0 5 <0 5 <2 5 11/11/97 1267 -2587 38 54 74' 076 1 1 <0 5 14 23/<6 4; -- 9 6171 xls/#385121 3 As of 11/01100