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Table 2 Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#17334 4501 North Pershing Avenue Stockton CA Well ID/ Ethyl- MtBE Dissolved Elevation Date Benzene Toluene Benzene Xylene TPHg TPHd 8020 MtBE TBA DIPS EtBE TAME Notes Oxygen DTW SPT WTE Oc) {t,grL) (>,9►L) (4WL) (Vg/U WIL) (N9n-1 (Pg/L) fugILOWL) WWI-) (119[L1 (mg/Ll (feet) {feet} {feet) Groundwater Grab Samples GP3 02/20/97 21 <0 5 <0 5 0 55 930 - 1,700 - - - -- - - GP4 02/20/97 9,100 33,000 3,900 24,000 150,000 -- 100,000 84,000 - -- - -- -- - GP7 02/20/97 <0 5 <0 5 <05 <0 5 <50 - <5 - -- - - - -- SB -1 50 04/03/02 180 650 7, 67 <5 <20 <2U < -- - -- - Monitoring WeFgaimples MW-1 734 12/19/97 1,200 1,100 580 1,500 15,000 9,900 14,000 <4,000 <1,000 <1,000 <1,000 02 1893 000 -11 59 03122198 2,200 3,400 880 3,200 23,000 11,000 <10,000 <500 <500 <500 02 1430 000 -696 06/15/98 5,000 7,200 1,700 8,800 52,000 21,000 <10,000 <500 <500 <500 1 5 1443 000 -709 08/25/98 - - - - - - - Well destro ed 08/14/98 and replaced by MW-5A on 08/25/98 7 26 12/19/97 41 88 56 270 2,600 - 280 350 <100 <25 <25 <25 01 1888 000 -11 62 03/22/98 15 61 13 65 560 360 <500 <25 <25 <25 02 1423 000 -697 06/15/98 85 89 084 63 <100 - 31 <100 <5 <5 <5 1 8 1437 000 -711 08/25/98 - - - - - Well destroyed 08114/98 and replaced by MW-58 on 08/25/98 MW-2 am 12/19/97 <0 5 <0 5 <0 5 <0 5 290 <50 <5 <5 <20 <5 <5 <5 01 1989 000 -1125 03/22/98 ND 1 6 068 27 ND - - <10 <100 <5 <5 <5 02 1525 000 -661 06/15/98 <03 <0 3 <0 5 <0 6 <100 - <10 <100 <5 <5 <5 21 1548 000 -684 08125/98 0 363 1 11 254 129 170 <5 <50 <5 <5 <5 - 1607 000 -743 12/29/98 <0 3 <0 3 <0 3 <0 6 <50 - <5 <20 <5 <5 <5 07 1670 000 -806 02/17/99 <0 5 <0 5 <0 5 <0 5 <50 - <5 <5 <20 <5 <5 <5 1 2 1584 000 -720 05/21/99 073 065 <0 3 115 <50 - <5 <20 <5 <5 <5 08 1576 000 -712 08/28/99 <0 3 <0 3 <0 3 <0 6 78 <5 <5 <20 <5 <5 <5 09 1730 000 -866 11/24/99 <03 <0 3 08 076 <50 - <5 <5 <20 <5 <5 <5 27 1725 000 -861 02/02/00 <03 <0 3 1 56 215 156 - <5 <5 <20 <5 <5 <5 13 1680 000 -816 05/16/00 <0 5 <0 5 <0 5 <1 <100 - <1 <50 <2 <2 <2 05 1495 000 -631 08/08/00 <0 5 <0 5 <0 5 <1 <100 - - <1 <50 <2 <2 <2 05 1667 000 -803 11/14/00 092 <0 5 <05 <1 5 <100 - <1 <50 <2 <2 <2 06 1690 000 -826 02/06101 <0 5 <05 0 59 <1 <100 - -- <1 <50 <2 <2 <2 a 10 1667 000 -803 05/23/01 <0 5 <05 <05 <1 <100 - 35 <50 <2 <2 <2 0 8 1599 000 -735 08/21101 <0 5 <05 <05 <1 <100 1 <50 <2 <2 <2 06 1735 000 -871 11/06/01 <0 5 <05 <0 5 <0 5 <50 - <5 <20 <5 <5 <5 0 8 1865 000 -1001 01/09/02 <5 <5 <5 <5 <50 - <10 <20 <5 <5 <5 08 1672 000 -8 08 04/11/02 <0 5 <05 <0 5 <0 5 <50 - <5 <0 5 <5 <05 <0 5 <05 08 1740 000 -876 07/10/02 <0 5 15 <0 5 <0 5 87 <5 08 <5 <0 5 <05 <0 5 09 1767 000 -903 10/15/02 <05 <0 5 <0 5 <0 5 <50 - <5 <0 5 <5 <0 5 <0 5 <0 5 1 0 1930 000 -1066 03/27/03 <0 50 <0 50 <0 50 <0 50 <50 - 072 <5 0 <0 50 <050 <0 50 0 9 1817 000 -953 17334 03-10Histoncal Water Page 1 of 5