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Table A Groundwater Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca California Well No 1 Ethyl- MTBE Dissolved Elevation Date Benzene Toluene benzene Xylenes TPH-G 8020 8260 TBA DIPE ETBE TAME 1,2-DCA Ethanol Methanol Oxygen DTW SPT WTE (TOC) (}ig/L) (Pg/L) (NgIL) (pgIL) (ug/L) (Nt3/L) (Pg/L) (pg/L) (ljg/L) (N9/L) (Pg/L) (Ng/L) (mg1L) (mglL) (mg/L) (ft) (ft) (ft) Water Grab Samples GP-1-W 04129198 3,000 1,400 520 2,500 19,000 430 380 <500 <25 <25 <25 — -- — — GP-2-W 04/29/98 21 036 24 25 1,600 16 <10 <100 <5 <5 <5 — — -- — - -- - GP-3-W 04/29/98 5,800 11,000 5,500 28,000 290,000 4,200 3,700 <10,000 <500 <500 <500 -- - - - - - - MW-5@Vy 05/11/99 200 140 110 520 1,500 120 75 <40 <10 <10 <10 — - - -- - - Monitoring Well Samples MW-1 3199 09116198 281 <0 3 421 245 1,550 1 — 738 1 <20 <5 <5 <5 — -- -- 1 2 1474 00.0 17 25 12/30/98 90 4 317 282 147 2,860 — 3830 <20 <5 <5 <5 -- — -- 06 1417 000 17 82 02118/99 75 <2 5 170 320 4,400 330 230 <50 <12 <12 <12 - -- 03 1426 000 1773 06/04/99 335 143 611 1,020 11,000 -- 1,240 <100 <25 <25 <25 - — — 02 1527 000 1672 09/14/99 114 29 683 282 98 772 104 329 <5 <5 <5 -- -- 1733 000 1466 11/04/99 44** 202— 15 2** 95 1** 530"" 126** B8** 33** <5 <5 <5 — -- — 1 8 1760 0 00 U 39 01/24/00 148 693 fib 9 168 2,020 335 347 <20 <5 <5 <5 -- — -- 0 9 17 70 0 00 14 29 04/06/00 630 11 0 3`10 100 1,100 -- 140 <100 <4 <4 1 <4 _ __ _ 44 1654 000 1545 07/21/00 22 <0 5 17 28 <100 -- 90 <100 <4 <4 <4 <1 <15 <5 1 28 1800 000 1399 10112/00 230 <12 630 1,200 7,200 — 1,100 860 <50 <50 <50 <25 <5 <5 06 1815 0 00 1384 01/16/01 <0 5 052 0 93*** <1 <100 — 610 <500 <20 <20 <20 — — -- 04 1800 000 1399 04/02/01 330 10 320 820 5,400 -- 2,700 <2,500 <100 <100 <100 -- — -- 35 1885 000 1314 06/26101 37 43 31 70 830 — 280 <250 <10 <10 <10 - - 21 2076 000 1123 11/28101 91 <2 5 83 230 2,100 — 1,300 <200 <50 <50 <50 - - - 07 21 12 000 1087 MW-1 A* 3209 09/16/98 <03 <0 3 906 3770 185 -- <5 <20 <5 <5 <5 -- — -- 3 8 15 39 0 04 1670 12130198 '03 1 <0 3 <0 3 <0 6 <50 — 5 38 <20 <5 <5 <5 — 1 2 1445 000 176403 02118/99 <05 <0 5 073 1 1 <50 <5 <5 <20 <5 <5 <5 - 0 3 14 49 0 00 17 60 06/04/99 3 05 1 75 214 <50 — 106 <20 <5 <5 <5 -- - -- 02 1564 0 00 16 45 09/14/99 258 jI 63 113 497 <50 <5 <5 <20 <5 <5 <5 - — -- — 1778 000 1431 11!04!99 1 26** 23** 059** 373** <54** <5** <5** <20** <5 <5 <5 - - — 3 0 1790 000 1419 01124!00 289 0 9 338 178 84 <5 747 <20 <5 <5 <5 _ _ 16 1785 000 1424 04106100 1 5 1 1 1 1 38 <100 -- 22 <50 <2 <2 <2 - - - 40 1709 0 00 1500 07/21/00 13 <0 5 <0 5 17 <100 25 <50 <2 <2 <2 <1 <5 <5 19 1862 000 1347 10112!00 18 8 4 7 9 42 210 4 6 <25 <2 <2 <2 <1 <5 <5 04 1837 000 13 72 01/16/01 1 052 211*** 3 2 <100 — 84 <50 <2 <2 <2 -- -- -- 35 1824 000 1385 04/02101 24 <0 5 23 42 <100 - 16 <50 <2 <2 <2 — 30 1901 000 13 08 06/26/01 71 56 42 10 <100 -- <1 <50 <2 <2 <2 - -- — 2 9 21 22 0 00 10 87 11 128101 36 1 3 1 8 7 3 fi3 <5 <20 <5 <5 <5 - -- -- 48 21 30 000 1079 7-11119976 tab xis Page 1 of 4 2-07-02