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T 2M M i M M M Historical Groundwater Monitoring Data 7-Eleven Store No 20632 4627 DaVinci Drive Stockton,California Well ID/ Ethyl- MTBE MTBE Dissolved Elevation Benzene Toluene Benzene Xylene TPH-G 8020 8260 TBA DIPS ETBE TAME Oxygen DTW SPT WTE (TOC) Date (pg1L) (pg/L) (pg/-) (pgIL) (NJIL) (pg/L) (pg/L) (pgIL) (pg/L) (pg/L) (pgIL) (mglt_} (feet) (feet) (feet) les Grab Sam Groundwater p GP-1 02/21/97 390 700 370 2,100 16,000 16,000 -- — — — -- -- "" -- GP-5 02/21/97 110 12 39 310 2,800 1,800 — _ -- — -- — — — GP-7 02/21/97 34 65 26 110 440 68 — -- -- -- -- -' -- — GP-8 02/21/97 <0 50 <0 50 <0 50 094 830 1,600 870 -- — -- — — — GP-9 02/21/97 <0 50 <0 50 <0 50 11 <50 <5 0 -- -- — -- - -- "" -- GP-10 102/21/97 <0 50 <0 50 <0 50 <0 50 <50 <5 0 — — — — — -- — -- " Monitoring Well Samples MW-1 1 73 10/17/97 65 <0 5 <0 5 13 51 16 13 — - — — -- 713 000 -540 03/22/98 ND ND ND 078 ND — 47 ND ND ND ND 04 535 000 -362 06115/96 <0 3 1 <0 3 e05 <06 <100 -- I <10 <100 <5 <5 <5 1 B 555 0 00 -362 08/25/98 <0 3 <0 3 <0 5 <0 6 <50 -- <5 <50 <5 <5 <5 -- 629 000 -456 12/29/98 <0 3 <0 3 <0 3 <06 <50 - <5 <20 <5 <5 <5 04 660 000 -487 02/17/99 <0 5 <0 5 <0 5 <0 5 <50 52 86 <2 <5 <5 <5 05 490 000 -317 05/21/99 <0 3 <0 3 <0 3 <0 6 <50 -- <5 <20 <5 <5 <5 10 605 000 -432 08/28/99 <0 3 <0 3 <0 3 <0 6 <50 681 564 <20 <5 <5 <5 09 680 000 -507 11/24/99 091 378 2 41 6 88 259 <5 <5 <20 <5 <5 <5 10 660 000 -487 02/02/00 <0 3 <0 3 <0 3 <0 6 <50 <5 21 1 <20 <5 <5 <5 1 0 549 GOO -376 05/16/00 <0 5 <0 5 <0 5 <1 <100 -- 16 <50 <2 <2 <2 07 549 000 -376 08/08/00 05 <0 5 <0 5 <1 <100 -- 12 <50 <2 <2 <2 04 647 000 -474 11/15/00 081 <0 5 <0 5 <1 5 <100 -- 76 <50 <2 <2 <2 05 585 000 -412 02/07101 <0 5 69 0 79* 16 <100 -- 29 <50 <2 <2 <2 04 573 000 -400 05/23/01 14 055 <0 5 <1 <100 -- 25 <50 <2 <2 <2 07 582 000 -409 08/21/01 <0 5 <0 5 1 16 <100 — 21 <50 <2 <2 <2 09 671 000 -498 11/05/01 <0 5 <0 5 096 is 120 -- <5 <20 <5 <5 <5 09 652 000 -479 MW-2 282 10/17/97 <0 5 <0 5 <0 5 <0 5 440 1,800 2,300 — — -- -- -- 837 000 -555 03/22/98 ND ND ND 0 78 ND — 2,000 ND ND ND ND 02 661 000 -379 06/15/98 <0 3 <0 3 <0 5 <0 6 1,300 — 1,600 <2,000 <100 <100 <100 1 5 684 000 -402 08/25/98 06 <0 3 <0 5 <0 6 1,550 - 1,610 <2,000 <200 <200 <200 -- 770 000 -488 12/29198 <0 3 <0 3 <0 3 <0 6 2,130 -- 5,280 <800 <200 <200 <2,000 04 776 000 -494 02/17/99 <0 5 <0 5 <0 5 <0 5 770 3,300 4,900 <1,000 <250 <250 <250 09 613 000 -331 05/21/99 385 <1 5 <1 5 <3 1,180 -- 5,340 <400 <100 <100 <100 08 737 0 00 4 55 08/28/99 <0 3 <0 3 <0 3 <0 6 2,100 -- 5,130 <800 <200 <200 <200 08 795 000 -5 13 7-1 1120632 tbl As 1 of 3 11-19-01