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To Ploof 16 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,Tracy,California <br /> Floating <br /> Well Depth product Groundwater Groundwater Total <br /> Date Elevation to Water thickness Elevation Elevation Change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE 00 <br /> Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgA) <br /> ATR-4 02/12196 1043 -- -- -- 6,300 <0 5 <0 5 340 150 — — <br /> (cont) 04/18/96 1077 -- — — 770 <1 0 <1 0 41 1 9 -- — <br /> 07/18/96 1052 — -- — 2,600 12 <5 52 <5 560 - <br /> 11/15/96 1151 -- -- — 440 <0 5 <05 0 8 2 2 140 -- <br /> 03/14/97 1157 -- -- -- 150 15 <05 <0 5 <0 5 870 007 <br /> 06/04/97 NP 1093 -- 420 8 7 1 4 1 2 1 3 5 4 008 <br /> 08/11/97 NP 1055 -- -- -- 320 2 4 1 1 <0 5 57 6 3 <br /> 11/17/97 NP 1120 -- -- -- 420 3,3 1 4 <0 5 0 76 4 8 — <br /> 03/30/98 NP 1038 — — -- <50 <0 5 <05 <0 5 <0 5 <5 0 1 1 <br /> 06/25/98 NP 1040 -- -- -- 658 <0 5 <05 <0 5 <0 5 <5 0 1 <br /> 09/11/98 NP 1106 — — -- <50 <0 5 <05 <0 5 <06 <25 0 84 <br /> 12/15/98 NP 1075 -- — -- <50 <0 5 <0 5 <0 5 <05 <50 1 1 <br /> 03/17/99 NP 1053 — — -- <50 <0 5 <05 <0 5 <05 <50 67 <br /> 05/14/99 NP 1097 -- — — <50 0 591 <0 5 <0 5 <05 8,720 2 0 <br /> 09/16/99 NP 1093 — -- -_ <50 <O 5 <0 5 <0 5 <0 5 <5 0 6 8 <br /> ATR-5 03/10/89 4873 -- -- -- — 6,600 693 <5 0 327 7 _- _ <br /> 06/29/89 1052 -- 38 21 -- 2,200 490 2 4 280 13 -- <br /> 09/18/89 1098 -- 3775 -0 46 1,000 6B 1 1 63 58 <br /> 12127!89 1076 3797 0 22 2,200 94 2 150 <1 — <br /> MI8/90 1090 — 37 83 -014 1,900 120 2 6 6 8 140 — <br /> 10/16/90 -- -- -- — 1,000 18 47 79 16 - — <br /> 10/19/90 11 10 -- 37 63 -- — — — <br /> 01/10/91 1084 — 37 89 026 350 71 1 2 16 2 6 _ <br /> 04/10/91 1067 -- 3806 017 370 46 <05 7 <0 5 <br /> 07/10/91 1102 — 3771 -0 35 1,200 9 5 <05 18 15 <br /> 09/24/91 11 29 -- 37 44 -027 <50 <0 5 <05 <0 5 <0 5 <br /> 01/23192 1078 — 3795 0 51 180 1 4 1 5 1 5 <0 5 <br /> 04/20/92 1070 — 3803 008 -- — _- __ <br /> 04/21/92 — -- -- — 290 16 <0 5 2 <0 5 - <br /> 07/08/92 1097 — 3776 -- 240 <0 5 <0 5 0 6 <0 5 — — <br /> 10/07/92 11 11 -- 37 62 -014 -- _ — — -- — _ <br /> 10/08/92 -- — — — 160 <05 <0 5 <05 <05 _ <br /> 01118/93 994 -- 3879 <br /> 01119193 — — -- -- 1,000 2 5 <0 5 7 9 13 -- <br /> 04/14/93 1047 -- 38 26 — -- — — _ _ _ <br />