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T4b1 Groundwater Monitoring Wta and Analytical Results • Tosco (Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California Well ID/ Date DTW GWE TPH(G) B T E X MTBE TOC* (ft ) (ft ) (ppb) (ppb) (ppb) (ppb) (ppb) OPb) MW-8 10/20/93 5028 -3990 92 40 072 076 1 8 -- (cont) 01/17-181942 47 85 -3747 620 3 9 27 11 48 -- 02/28/942 4677 -36 39 88 <0 5 <0 5 <05 09 -- 04/25-26/94 45 81 -35 43 94 067 1 2 052 24 -- 07/25-26194 4820 -37 82 170 <0 5 082 <05 1 7 -- 10/26-27/94 49 33 -38 95 <50 <0 5 <0 5 <0 5 1 3 -- 01/25-26/95 46 63 -3625 <50 <05 072 <0 5 1 4 -- 04/26-27/95 42 13 -31 75 <50 <0 5 <05 <0 5 <0 5 -- 07/26/95 43 10 -3272 <50 079 22 <05 2 7 -- 10125-26195 43 94 -33 56 01/25/96 41 14 -3076 <50 <05 <0 5 <05 065 - 04/25/96 36 59 -2621 07/24/96 36 88 -2650 <50 <0 5 <05 <05 <0 5 <50 10/23/96 38 64 -2826 SAMPLED SEMI-ANNUALLY 01/20/97 35 17 -2479 290 4 3 082 <0 5 45 9 3 07/16/97 32 47 -2209 <50 <05 <05 <05 <0 5 <5 0 10/15/974 INACCESSIBLE 12/08/974 INACCESSIBLE 03/05/98 3007 -1969 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 05/27/98 2661 -1623 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 07/21/98 2665 -1627 7311 093 40 072 4 3 13/8 96 10/14/98 2757 -17 19 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 01/25-26/99 2683 -1645 <50 <0 50 <0 50 <0 50 10 <2 51<2 06 i MW-9 10121-22/92 - - <50 <05 <05 <0 5 <05 -- 01/13/93 - -- <50 <05 <0 5 <05 <05 - 11 76 04/26/93 5052 -3876 <50 <0 5 <05 <05 <05 -- 07/26/93 51 50 -3974 <50 <0 5 <05 <0 5 <0 5 -- 10/20/93 51 99 -4023 <50 <0 5 <05 <05 <05 - 01/17-18/94' 49 58 -37 82 280 4 9 15 9 1 45 - 02/28/942 48 50 -36 74 <50 <0 5 <0 5 <05 <05 -- 04/25-26194 4751 -35 75 <50 <0 5 094 <05 1 3 -- 07/25-26194 4987 -38 11 <50 <05 <05 <0 5 <0 5 -- 10/26-27/94 51 03 -3927 <50 <05 <05 <05 <05 -- 01/25-26195 4832 -3656 <50 <0 5 <05 <05 <05 -- 6981 xls/#180138 8 As of 01/26/99