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2 <br /> Historical Groundwater Monitoring Data <br /> 7-Eleven Store No 20632 <br /> 4627 DaV+nci 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 i SPT WIFE <br /> (TOC) Date (pg/L) (pgll-) (pglL) (pg/L) (pg1L) (pg/L) (pg1L) (pg/t_) (pg/L) (pg/L) (pg1L) (mglL) (feet) (feet) (feet) <br /> Groundwater Grab Samples <br /> GP-1 02/21/97 390 700 370 2,100 16,000 116,000 — <br /> GP-5 02121/97 110 12 39 310 2,800 1,800 — -- <br /> GP-7 02/21/97 34 66 26 110 440 58 - — -- — -- -- — <br /> GP-8 02/21/97 <0 50 <0 50 <0 50 094 830 1,600 870 — <br /> GP-9 02/21/97 <0 50 <0 50 <0 50 11 <50 <5 0 — -- — -- -- '" — <br /> GP-10 102/21/971 <0 50 <0 50 <0 50 <0 50 <50 <5 <br /> Monitoring Well Samples <br /> MW-1 <br /> 173 10/17/97 66 <05 1 <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 /> 06/15/98 <0 3 <03 <0 5 <0 6 <100 — <10 <100 <5 <5 <5 is 555 000 -382 <br /> 08/25/98 <03 <0 3 <0 5 <0 6 <50 -- <5 <50 <5 <5 <5 -- 629 000 -456 <br /> 12/29/98 <0 3 <0 3 <03 <06 <50 — <5 <20 <5 <5 <5 04 660 000 -487 <br /> 02/17/99 <0 5 <0 5 <0 5 <0 5 <50 52 86 <2 <5 <5 <5 05 490 000 -317 <br /> 05/21/99 <03 <03 <0 3 <06 <50 -- <5 <20 <5 <5 <5 10 605 000 -432 <br /> 08/28/99 <0 3 <0 3 <0 3 <0 6 <50 581 554 <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 <0 3 <0 3 <03 <0 6 <50 <5 211 <20 <5 <5 <5 10 549 000 -376 <br /> 05/16/00 <0 5 <0 5 <0 5 <1 <100 -- 16 <50 <2 <2 <2 07 549 000 -376 <br /> 08/08/00 05 <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 <0 5 59 0 79* 16 <100 — 29 <50 <2 <2 <2 04 573 000 -4 00 <br /> 05/23/01 14 056 <0 5 <1 <100 25 <50 <2 <2 <2 07 582 000 409 <br /> 08/21/01 <0 5 <0 5 1 15 <100 -- 21 <50 <2 <2 <2 09 671 000 -498 <br /> 11/05/01 <0 5 1 <0 5 095 Is 120 -- <5 <20 <5 <5 <5 09 652 000 -479 <br /> 01/09102 <5 <5 <5 <5 <50 -- 180 77 <5 <5 <5 08 413 000 -240 <br /> MW-2 <br /> 282 10/17/97 <0 5 <0 5 <0 5 <0 5 440 1,800 2,300 -- -- — — -- 837 000 -555 <br /> 03/22/98 ND ND ND 078 ND -- 2,000 ND ND ND ND 02 661 000 -379 <br /> 06/15/98 <03 <0 3 <0 5 <0 6 1,300 -- 1,600 <2,000 <100 <100 <100 15 684 000 -402 <br /> 08/25/98 06 <0 3 <0 5 <0 6 1,550 -- 1,610 <2,000 <200 <200 <200 — 770 000 -488 <br /> 12/29/98 <0 3 <0 3 <0 3 <0 6 2,130 -- 5,280 <800 <200 <200 <2,000 04 776 000 -494 <br /> 02/17/99 <05 <0 5 <0 5 <0 5 770 3,300 4,900 <1,000 <250 <250 <250 09 613 000 -331 <br /> 05/21/99 385 <1 5 <15 <3 1,180 -- 5,340 <400 <100 <100 <100 08 737 000 -455 <br /> 08/28199 <br /> <0 3 <0 3 <0 3 <0 6 2,100 -- 5,130 <800 <200 <200 <200 0 8 7 95 000 -513 <br /> 7-11120632 tbl As 1 of 3 03-06-02 <br />