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10 TO Pao of 18 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,California Floating Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPHg Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet MSL) (feet,TOC) in feet (feet MSL) feet b (ppb) b b ( b) (m } ATR 7 03/10/89 4965 - <200 <0 5 <0 5 <0 5 17 06/21/89 11 90 3775 <50 1 <0 3 06 05 09/18/89 11 98 3767 008 <50 04 <0 3 <0 3 1 1 12/27/89 11 94 3771 004 90 10 09 27 79 04/18/90 1201 3764 -007 <50 61 26 21 58 10/16/90 - - <50 <0 5 <0 5 <0 5 <0 5 10/19/90 1220 3745 - - -- -- -- -- 01/10/91 - - <50 6 <0 5 1 8 41 04/10/91 -- - - - - 07/10/91 - -- -- - 09/24/91 1234 37 31 - - - - 09/25/91 - -- <50 13 <0 5 <0 5 <0 5 01/23/92 -- -- -- -- 04/20/92 - - - - 97/08/92 - -- - - - 10/07192 1221 3744 -- -- -- -- - t 0!08192 - -- <50 <0 5 <0 5 <0 5 <0 5 - 01/18/93 11 33 3832 - -- - -- 01/19/93 <50 1 <0 5 06 <0 5 -- 04/14/93 1175 3790 -- -- -- - 04/15/93 -- -- - <50 29 <0 5 <0 5 <0 5 08131/93 1224 3741 -- <50 <0 5 <0 5 <0 5 <0 5 10/27/93 1223 3742 001 <50 <0 5 <0 5 <0 5 13 02/18/94 11 93 3772 030 <10 <0 3 <0 3 <0 3 <0 5 05/20/94 1200 3765 -007 <10 <0 3 <0 3 <0 3 <0 5 10/07/94 1223 3742 -023 <50 <0 5 <0 5 <0 5 <0 5 - 12/16/94 11 94 3771 029 <50 <0 5 <0 5 <0 5 <0 5 02/28/95 1200 3765 -006 <50 <0 5 <0 5 <0 5 <0 5 - 04/25/95 1241 3724 -041 <50 <0 5 <0 5 <0 5 <0 5 07/27/95 1261 3704 020 <50 <0 5 <0 5 <0 5 <0 5 10/26/95 1267 3698 -006 <50 <0 5 <0 5 <0 5 <0 5 02/12/96 11 95 3770 072 <50 <0 5 <0 5 <0 5 <0 5 04/t8/96 1235 3730 -040 <50 <0 5 <0 5 <0 5 <0 5 07/18196 1245 3720 -0 10 <50 <0 5 <0 5 <0 5 <0 5 28 11/15/96 1311 3654 066 <50 <0 5 <0 5 <0 5 <0 5 120 03/14/97 1320 3645 009 <50 <0 5 <0 5 <0 5 <0 5 63 0 10 06/04/97 NP 1244 3721 076 <50 <0 5 <0 5 <0 5 <0 5 <2 5 0 13 08/11/97 NP 1272 3693 -028 <50 <0 5 <0 5 <0 5 <0 5 22 -