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I i A Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA Well ID/ Ethyl- MtBE 1,2- Eth- Meth- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA RIPE EtBE TAME pCA anol anol Notes Oxygen DTW SPT WTE TOC INqIL) (NgrL) INglL) (Ng1L) INg1L (p91L) (kg,L) (iig1L) (NglL) (ug1L) (Ng1L) (Ng1L) (mglL) (mg1L) (mg1L) (feet) (feet) (feet) Water Grab Samples GP 1 w 04/29/98 3,000 1,400 520 2,500 19,000 430 380 <500 <25 <25 <25 - -- - - -- -- GP 2 W 04/29/98 21 036 24 26 1,600 16 <10 <100 <5 <5 <5 - - - - - --GP-3-W 04/29/98 6,800 11,000 5,500 28,000 290,000 4,200 3,700 <10 000 <500 <500 <500 - - - -- -- - - Mws@w 05/11/99 200 140 110 620 1,500 120 75 <40 <10 <10 <10 -- - - - - - - Monitoring Well Samples MW-1 3199 09/16/98 281 <0 3 421 245 1,550 -- 738 <20 <5 <5 <5 - - -- 12 1474 000 1725 12/30/98 904 317 282 147 2,860 -- 3830 <20 <5 <5 <5 - - - 06 1417 000 1782 02/18/99 75 <2 5 170 320 4,400 330 230 e50 <12 <12 <12 - -- - 03 1426 000 1773 06/04/99 336 143 611 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 44 202 162 961 530 126 88 33 <5 <5 <5 - _ ~ b 18 1760 000 1439 01/24/00 148 693 569 168 2,020 335 347 <20 <5 <5 <5 - - - 09 1770 000 14 29 04/06/00 630 11 0 310 100 1,100 -- 140 <100 <4 <4 <4 - - -- 44 1654 000 1545 07/21/00 22 <0 5 17 28 <100 -- 90 <100 <4 <4 <4 <1 <15 <5 28 1800 000 1399 10/12/00 230 <12 630 1,200 7,200 - 1,100 860 <50 <50 <50 <25 <5 <5 06 1815 000 1384 01/16/01 <0 6 052 093 <1 <100 -- 610 <500 <20 <20 <20 -- - -- C 04 1800 000 1399 04/02/01 330 10 320 820 5,400 - 2,700 <2,500 <100 <100 <100 - - -- 35 1885 000 1314 06/26/01 37 43 31 70 830 - 280 <250 <10 <10 <10 - - 21 2076 000 1123 11128/01 91 <2 5 83 230 2,100 - 1,300 <200 <50 <50 <50 - - - 07 21 12 000 1087 01/30/02 83 <5 <5 <5 2,500 - 9,200 <1,000 <250 <250 <250 - - - 10 1885 000 1314 04/04/02 150 <10 46 59 2,900 4,100 5,600 1,400 <100 <100 <100 -- - -- 09 1972 000 1227 07/08/02 23 0 81 18 29 320 590 970 220 <12 <12 <12 -- - - 10 2087 000 11 12 10/03/02 43 <0 5 25 22 100 130 100 <25 <2 5 <2 5 <2 5 - - - 1 1 2000 000 11 99 03/11/03 47 <1 0 39 30 180 -- 390 96 <1 0 <1 0 12 - -- -- 31 1977 000 1222 06/27103 077 <0 50 065 16 <50 - 55 11 <0 50 <0 50 <0 50 - -- - 54 2042 000 11 57 09/15/03 30 <0 50 22 30 78 -- 160 30 <0 50 <0 50 <0 50 -- - - 60 2071 Goo 11 28 12/23/03 36 <0 50 57 32 61 - 290 67 <0 50 <0 50 070 - - - 32 2189 000 1010 03/29/04 40 <0 50 81 29 180 - 460 100 <0 50 <0 50 13 - - - 10 2103 000 1096 06/10/04 <0 50 <0 50 10 061 <50 - 140 25 <0 50 <0 50 <0 50 - - - 54 2308 000 891 117-Elevenl7-11 Stores1199761Tables119976 04-20 AsHistoncal Water Page 1 of 10