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Tab* . Groundwater Monitoring Data and Analytical Results Tosco (Unocal) Service Station#6981 y 4707 Pacific Avenue Stockton, California Wefl IDI Date DTW GWE TPH(G) B T E X MTBE TOC* (f11 (ft} b) (ppb) (ppb) (ppb) (Ppb) (ppb) MW-8 04/16/92 - - NOT SAMPLED - - -- -- 07/30/92 - -- <50 1 7 <05 <05 <05 - 10/21-22192 - -- <50 <05 08 <05 <05 - 01/13/93 - -- <50 <05 <05 <05 <05 1038 04/26/93 4880 -3842 120 1 1 <05 <05 <05 - 07/26/93 49 79 -3941 90 06 <0 5 <05 <05 - 10/20/93 5028 -3990 92 40 072 076 1 8 - 01/17-18/942 4785 -3747 620 3 9 27 11 48 - 02/28/942 4677 -3639 88 <05 <05 <05 09 - 04/25-26/94 45 81 -35 43 94 0 67 1 2 052 24 -- 07/25-26194 4820 -37 82 170 <05 082 <05 1 7 10126-27194 4933 -38 95 <50 <05 <0 5 <05 1 3 - 01/25-26/95 4663 -3625 <50 <0 5 072 <0 5 14 -- 04/26-27195 42 13 -31 75 <50 <05 <05 <05 <05 - 07/26/95 43 10 -32 72 <50 079 22 <0 5 27 10/25-26/95 4394 -33 56 - - - - -- - 01/25/96 41 14 -3076 <50 <05 <05 <05 065 - 04/25/96 3659 -2621 -- - - -- 07/24/96 36 88 -2650 <50 <05 <0 5 <05 <05 <50 10/23/96 3864 -2826 SAMPLED SEMI-ANNUALLY -- - - - 01/20/97 35 17 -2479 290 4 3 082 <05 45 9 3 07/16/97 3247 -2209 <50 <0 5 <0 5 <0 5 <05 <5 0 101151974 INACCESSIBLE - -- -- 12/08197` INACCESSIBLE - -- - 03/05/98 3007 -1969 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 0° 05/27/98 2661 -1623 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 07/21/98 2665 -1627 7311 093 40 072 43 13/89 6 10/14/98 27 57 -17 19 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 01/25-26/99 26 83 -1645 <50 <0 50 <0 50 <0 50 1 0 <2 5/<2 06 04/19-28/99 24 51 -1413 <50 <0 50 <0 50 <0 50 <0 50 121786 MW-9 10/21-22192 -- - <50 <0 5 <05 <05 <0 5 -- 01/13/93 -- -- <50 <05 <05 <0 5 <05 1176 04/26/93 5052 -38 76 <50 <0 5 <05 <0 5 <05 - 07/26/93 51 50 -3974 <50 <0 5 <05 <05 <05 - 6981 x1s/#180138 8 As of 04!20199