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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in pg/l_ m <br /> Top-of-casing Deptli-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date m feet(a) m feet m feet m feet(b) m feet Benzene Toluene Ethylbenzene XylTPH-G <br /> 1017194 Xylenes MTBE DO <br /> 1193 3729 032 <05 <05 <05 <[}5 50< <br /> 12/16/94 11 56 -- 3766 -037 <0 5 <0 5 <0 5 <0 5 <50 <br /> 2/28/95 1160 -- 3762 004 <0 5 <0 5 <0 5 <0 5 <50 - -- <br /> 4/25/95 1195 -- 3727 035 <0 5 <0 5 <0 5 <0 5 <50 _- <br /> 7/27/95 1291 3631 096 <0 5 <0 5 <0 5 <0 5 <50 - <br /> 10/26/95 1226 -- 3696 -065 <0 5 <0 5 <0 5 <0 5 <50 <br /> 2/12/96 1140 -- 37 82 -086 <0 5 <0 5 <0 5 <0 5 <50 -- <br /> 4/18/96 1190 -- 3732 050 <2 5 <2 5 <2 5 <2 5 <250 -- -- <br /> 7/18/96 12 10 37 12 020 <0 5 <0 5 <0 5 <0 5 <50 500 -- <br /> 11/15/96 1270 -- 3652 060 <0 5 <0 5 <0 5 <0 5 <50 750 -- <br /> 3/14/97 NP 12 70 3652 000 <0 5 <0 5 <0 5 <0 5 <50 280 008 <br /> 6/4/97 NP 12 02 -- 3720 -0 68 064 <0 5 <0 5 <0 5 <50 480 006 <br /> 8111/97 NP 1233 -- 3689 031 <0 5 <0 5 <0 5 <0 5 <50 440 060 <br /> 11/17/97 NP 1226 -- 3696 -007 <0 5 <0 5 <I15 <0 5 <50 98 -_ <br /> ATR-3 <br /> 4/23187 4993 11 79 -- 38 14 -- 2300 180 <5 {} 2300 17000 <br /> 12/22/87 1193 -- 3900 0 14 5000 50 530 250 -- <br /> 3/24/88 1258 3735 065 8300 8700 4400 7800 43000 -- <br /> 6/23188 11 17 -- 3876 -141 6160 4221 1800 4750 70000 -- <br /> 9/29/88 1223 -- 3770 106 8850 17600 2190 8170 57400 -- -- <br /> 2/22/89 11 82 38 11 -0 41 1000 2100 480 2000 110000 -- <br /> 6/29/89 -- -- -- 890 520 250 1100 4500 -- <br /> 9/18/89 12 19 -- 3774 -- 1000 1300 460 2200 7400 -- <br /> 12/28/89 1201 -- 3792 -0 18 840 1400 840 5600 27000 - -- <br /> 4/18/90 12 15 -- 3778 0 14 1000 490 340 1500 4800 -- <br /> 10/16/90 12 35 -- 3758 020 1900 1300 780 4600 14000 - -- <br /> 19/90 1228 -- 3765 -007 <br /> 1/10/91 1201 3792 -027 610 230 160 670 2600 -- <br /> 4/10/91 1182 -- 3811 -019 910 120 110 190 3000 <br /> 7/I0/91 1223 -- 37 70 041 420 300 340 760 19000 -- <br /> 9/24/91 12 57 -- 3736 034 280 81 69 130 2000 <br /> 1/23/92 12 12 Sheen 3781 -0 45 -- <br /> 4/20/92 1193 Sheen 38 00 -0 19 _- <br /> 718/92 1222 Sheen 37 71 029 <br /> 4747UABLES12093N0V7 XLS <br /> I <br />