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Table I II Groundwater Monitoring Data and Analytical Results Tosca (Unocal) Service Station#6981 4707 Pacific Avenue Stockton, California Well IDI Date DTW GWE TPH(G) B T E X § MTBE TOC* ft) Ot) (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) NIW-13 10121-22192 - <50 <05 <05 <0 5 <0 5 - 01/13/93 - -- <50 <05 <05 <05 <0 5 U 1152 04/26/93 51 15 -39 63 <50 <05 <05 <05 <05 -- 07/26/93 52 21 -4069 <50 <05 <05 <05 <05 -- y 10/20/93 52 74 -41 22 <50 <05 <05 <05 <05 -- 01117-18194'- 50 19 -38 67 180 23 20 90 39 -- 02/28/942 4905 -37 53 <50 <0 5 <05 <05 093 - 04/25-26194 48 02 -36 50 <50 <0 5 081 <0 5 1 4 - 07/25-26194 5051 -38 99 <50 <0 5 <05 <0 5 <05 - 10/26-27194 51 74 -4022 <50 <05 <05 <05 <0 5 - 01/25-26195 48 93 -37 41 <50 <05 <05 <05 <0 5 - 04/26-27195 44 17 -32 65 <50 055 2 1 <05 2 1 -- 07/26/95 45 36 -33 84 <50 059 2 1 <05 2 4 -- 10/25-26195 4628 -34 76 <50 <05 <05 <05 <0 5 -- 01/24/96 43 30 -31 78 <50 <05 <05 <05 <05 - 04/25/96 38 38 -26 86 <50 <05 <05 <0 5 <05 <40 07/24/96 DESTROYED - - -- - -- (11IW-14)7 02/28/94 - - <50 <05 <0 5 <05 <0 5 -- V W-1 I NA 07/24/96 38 27 180 1 9 1 9 1 6 7 7 130 10/23/96 SAMPLED SEMI-ANNUALLY - -- -- I - 01/21/97 3647 <50 <05 <05 <0 5 <05 <5 0 07/16/97 33 89 <50 <05 <05 <05 <05 <5 0 10/15/97 35 72 <50 <05 <05 <05 <05 <5 01<2 06 12/08/97 35 62 - - - -- -- I - 03105/98 31 33 <50 <0 50 <0 50 <0 50 <0 50 <2 5/<2 06 05/27/98 27 92 <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 07/21/98 27 98 - <50 <0 50 1 4 <0 50 1 4 <5 0/<2 06 10/14/98 2900 -- <50 <0 50 <0 50 <0 50 <0 50 <2 51<2 06 01125-26199 28 19 <50 <0 50 <0 50 <0 50 <0 50 <2 512 56 04119-20199 2576 <50 <0 50 <0 50 <0 50 <0 50 52/306 07115-16/99 2709 -- <50,- <0 50/'— <0 50/ <0 50/ <0 50 r <2 512 06/ 6981 0138 • As 016199