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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses ARCO Facility 2093, Tracy, California Floating Change Concentrations in}ig/L in Top-of-casing Depth-to- product Water-level since last Well number elevation, water, thickness elevation, measurement, Total and date in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth /benzene Xylenes TPH-G MTBE DO 4/10/91 1099 3804 -0 17 84 <0 5 <0 5 24 500 7/10/91 1132 3771 033 39 <0 5 3 7 3 190 -- 9/24/91 1157 -- 37.16 025 22 <05 42 13 70 r -- 1/23/92 11 16 3787 -041 300 52 49 72 1200 - -- 4/20/92 11 12 -- 3791 -004 -- 4/21/92 -- 150 <5 36 29 560 -_ 7/8/92 11 31 -- 3772 150 2 1 36 39 590 -_ 10/7/92 1145 -- 3758 0 14 -- 10/8/92 -- -- -- -- 240 48 62 97 1200 -- -- 18/93 10 45 -- 3858 1119193 -- -- -- -- 240 55 44 90 1200 -- 4/14/93 1087 - 38 16 _4/15/93 -- -- -- -- 160 42 47 63 810 -- 8/31/93 (c) 1098 -- -- -- 33 <0 5 6 13 100 r_ 10/27/93 1098 -- -- -- 12 12 79 16 200 -- 2/18/94 1031 -- -- -067 140 5 73 30 950 -- _- 5/20/94 1071 -- -- 040 590 5 9 190 220 8100 -- -- 10/7/94 1100 -- -- 029 30 I 16 73 1100 12/16/94 1061 -- -- -039 310 2 3 350 200 1600 - 2/28/95 1068 007 180 <5 750 100 4600 -- 4/26/95 1094 __ -- -- 0 26 19 <1 110 83 1100 7127/95 11 11 -- 0 17 12 <2 5 170 84 1700 -- 10/26/95 11 18 __ __ 007 10/27/95 -- -- 7 <1 30 2- 600 -- -- 2/12/96 1043 -- -- -- <0 5 <0 5 340 150 6300 4/18/96 1077 -- -- 034 <1 0 <1 0 41 1 9 770 7118/96 1052 -- -- -025 12 <5 52 <5 2600 560 -- 11/15/96 11 51 -- -- 099 <0 5 <0 5 08 22 440 140 3/14/97 NP I1 57006 15 <0 5 <0 5 <0 5 150 870 007 6/4/97 NP 1093 -- .- - -064 87 14 12 13 420 54 008 8/11/97 NP 1055 -- -- -038 24 1 1 <0 5 057 320 63 0 19 11/17/97 NP 1120 — — 065 33 1.4 <0 5 076 420 48 — 4747UABLLS12093N0V7 XLS