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Table 2 <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store No 20632 <br /> 4627 DaVina Drive <br /> Stockton, California <br /> Well ID/ Ethyl- MTBE MTBE Dissolved <br /> Elevation Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPE ETBE TAME Oxygen DTW SPT WTE <br /> (TOC) Date (Ng/t-) (pg/L) (pg/L) (Ng/L) (Ng/L) (pg/L) (Ug/L) (ug/L) (pg/L) (Ng1L) (Vg/Q (mg/L) (feet) (feet) (feet) <br /> Groundwater Grab Samples <br /> GP-1 02/21/97 390 700 370 2,100 16,000 16,000 -- -- — — — -- — — - <br /> GP-5 02/29/97 110 12 39 310 2,800 1,800 -- <br /> GP-7 02/21/97 34 65 26 110 440 68 <br /> GP-8 02/21/97 <050 <0 50 <050 094 830 1,600 870 <br /> GP-9 02/21/97 <050 <0 50 <050 1 1 <50 <50 -- -- -- -- — - _ _ <br /> GP-10 02/21/97 1 <0 50 <0 50 <0 50 1 <0 50 <50 <50 -- <br /> Monitoring Well Samples <br /> MW-1 <br /> 173 10/17/97 65 <0 5 <0 5 13 51 16 13 -- -- — — 713 000 -540 <br /> 03/22/98 ND ND ND 078 ND -- 47 ND ND ND ND 04 535 000 -362 <br /> 06115!98 <0 3 <0 3 <0 5 <06 <100 — <10 <100 <5 <5 <5 18 555 000 -382 <br /> 08/25/98 <0 3 <0 3 <0 5 <0 6 <50 -- <5 <50 <5 <5 <5 -- 629 000 -456 <br /> 12/29/98 <03 <0 3 <0 3 <06 <50 -- <5 <20 <5 <5 <5 04 660 000 4 87 <br /> 02/17/99 <0 5 <0 5 <0 5 <0 5 <50 62 86 <2 <5 <5 <5 05 490 000 -317 <br /> 05/21/99 <03 <0 3 <0 3 <0 6 <50 -- <5 <20 <5 <5 <5 10 605 000 -432 <br /> 08/28/99 <03 <0 3 <0 3 <06 <50 581 5 54 <20 <5 <5 <5 09 680 000 -507 <br /> 11/24/99 091 378 241 588 259 <5 <5 <20 <5 <5 <5 10 660 000 -487 <br /> 02/02/00 <03 <0 3 <03 <06 <50 <5 211 <20 <5 <5 <5 1 0 549 000 -376 <br /> 05/16/00 <0 5 <0 5 <05 <1 <100 -- 16 <50 <2 <2 <2 07 549 000 -376 <br /> 08/08/00 06 <0 5 <0 5 <1 <100 — 12 <50 <2 <2 <2 04 647 000 -474 <br /> 11/15/00 081 <0 5 <0 5 <1 5 <100 — 76 <50 <2 <2 <2 05 585 000 -412 <br /> 02/07/01 <05 59 0 79" 16 <100 -- 29 <50 <2 <2 <2 04 573 000 -400 <br /> 05/23/01 14 066 <0 5 <1 <100 -- 25 <50 <2 <2 <2 07 582 000 4 09 <br /> 08/21/01 <0 5 <0 5 1 15 <100 -- 21 <50 <2 <2 <2 09 671 000 -498 <br /> 11105/01 <0 5 <0 5 0.95 15 120 -- <5 <20 <5 <5 <5 09 652 000 -479 <br /> 01/09/02 <5 <5 <5 <5 <50 — 180 77 <5 <5 <5 08 413 000 -240 <br /> 04110/02 <0 5 073 <0 5 <0 5 <50 <5 19 <5 <0 5 <0 5 <0 5 08 602 000 -429 <br /> 07/10/02 <0 5 07 <0 5 <05 <50 <5 39 <5 <0 5 <0 5 <0 5 10 650 000 -477 <br /> 7-11/20632 tbl xls 1 of 4 08-12-02 <br />