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Table 1-3 SUMMARY OF GROUND WATER MONITORING AND SAMPLING RESULTS Former Mobil Bulk Plant 04-343 Tracy, California Casing Depth to Ground Water Ethyl- Total Well Month/ Elevation Water Elevation TPH-G TPH-D Benzene Toluene benzene Xylenes Number Year feet feet feet (pp b pb P b P b .�- AW-3 10/02/90 32.62 11.42 21.20 4,200 10,000 0.5 3.5 4.9 21 02/06/91 11.73 20.89 ND<300 9,800 ND<2.5 ND<2.5 ND<2.5 ND<5.0 05/07/91 32.18 11.14 21.04 210* ND<50 ND<0.3 ND<0.3 0.3 0.8 08/21/91 11.05 21.13 620** 22,000 ND<0.60 ND<0.60 ND<0.60 0.70** 11/26191 11.67 20.51 610 2600 ND<0.30 ND<0.30 ND<0.30 0.48 02/21/92 11.37 20.81 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 32.68 11.63 21.05 ND<30 75 ND<0.30 ND<0.30 ND<0.30 0.48 04/24192 1162 21.06 120 1400 ND<0.30 ND<0.30 ND<0.30 ND<0.30 071,20/92 11.67 21-01 ND<50 870 ND<0.5 ND<0.5 ND<0.5 ND<0.5 10121/92 11.73 20.95 65 880 ND<0.5 ND<0.5 ND<0.5 ND<0.5 01/22/93 11.01 21.67 ND<50 320 ND<0.5 ND<0.5 ND<0.5 ND<0,5 04/02/93 11.37 21.31 ND<50 120 ND<0.5 ND<0.5 ND<0.5 ND<0.5 05/27/93 11.39 21.29 ND<50 210 ND<0.5 ND<0.5 ND<o.5 ND<0.5 AW-4 10/02/90 32.67 10.99 21.68 ND<50 ND<50 ND<0.30 ND<o.30 ND<0.30 ND<0.30 < < 0 ND 20Q ND<0.5 ND<0.5 ND<0.5 ND<0.5 02106/91 10.8fi 21.81 ND 5 05/07/91 32.76 10.54 22.22 ND<50 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 08/21/91 10.60 22.16 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 11/26/91 11.14 21.62 ND<30 100 ND<0.30 ND<0.30 ND<0.30 ND<0.30 02/571/92 10.69 22.07 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 041137/92 33.26 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/24/92 11.01 22.25 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 4 071'20/92 11.14 22.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 M 10/21192 11.22 22.04 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 0i/:22j93 10.17 23.09 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 04/132/93 10.61 22.65 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 05/,27/93 10.74 22.52 ND<50 f4 Page 2 of 5 I I