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Tap PafPoi 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) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/1) ATR 5 03/10/89 4873 -- -- -- -- 6,600 693 <50 327 7 06/29/89 1052 3821 2,200 490 24 280 13 09/18/89 1098 - 3775 -046 1,000 68 1 1 63 5 8 12/27/89 1076 3797 022 2,200 94 2 150 <1 04/18/90 1090 -- 3783 -014 1,900 120 2 6 6 8 140 10/16/90 - -- -- 1,000 18 47 79 16 10/19/90 11 10 - 3763 -- - - - -- _ 01/10/91 1084 -- 3789 026 350 7 1 12 16 2 6 04/10/91 1067 - 3806 017 370 4 6 <0 5 7 <0 5 07/10/91 1102 -- 3771 -035 1,200 9 5 <0 5 118 1 5 09/24/91 1129 3744 027 <50 <0 5 <0 5 <0 5 <0 5 - 01/23/92 1078 - 3795 051 180 1 4 15 1 5 <0 5 04/20/92 1070 -- 3803 008 -- - -- - - 04/21/92 -- - -- -- 290 16 <0 5 2 <0 5 07/08/92 1097 3776 -- 240 <05 <0 5 06 <0 5 10/07/92 11 11 - 3762 -014 -- - -- -- -- 10/08/92 __ -" -- 160 <0 5 <0 5 <0 5 <0 5 01/18/93 994 3879 - -- - 01/19/93 -- -- -- 1,000 2 5 <0 5 7 9 1 3 04114/93 1047 "- 3826 -- -- - . 04/15/93 -- - -- -- 810 1 5 <0 5 8 3 09 08/31/93 11 16 3767 80 <0 5 <0 5 <0 5 <0 5 10/27/93 11 11 -- 3762 006 63 <0 5 <0 5 <0 5 <0 5 02/18/94 1073 - 3800 038 160 3 5 1 4 05/20/94 1082 3791 -009 600 <0 3 2 12 17 10/07/94 11 14 - 3759 -032 660 <0 5 <0 5 <0 5 <0 5 12/16/94 1077 -- 3795 037 410 6 5 <0 5 <0 5 <0 5 02/28/95 1080 -- 37 93 -003 60 <0 5 06 <0 5 <0 6 - 04/26/95 1104 3769 -0 24 83 <0 5 <0 5 <0 5 <0 5 07/27/95 1127 -- 3746 023 58 <0 5 <0 5 <0 5 12 10/26/95 {c) 10 51 - -- -- -" -- . 10/27/95 -- <520 <5 <0 5 <0 5 <0 5 -- 02/12/96 960 -- 92 1 <0 5 <0 5 <0 5 04/18/96 806 -- -- - 60 <0 5 <0 5 <0 5 <0 5 07/18/96 1011 280 4 8 <0 5 <0 5 <0 5 14 1 11/15/96