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I 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} (ppb) {ppb) (Ppb) AW-5 05/+07191 30.61 10.21 20.40 ND<50 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 08/21/91 10.07 20.54 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 11/26/91 10.69 19.92 ND<30 370 ND<0.30 ND<0.30 ND<0.30 ND<0.30 02/21/92 10.43 20.18 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 31.11 10.72 20.39 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/24/92 10.71 20.40 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 07/20/92 10.79 20.32 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 10/;21/92 10.78 20.33 ND<50 96 ND<0.5 ND<0.5 ND<0.5 ND<0.5 � 01/22/93 10.09 21.02 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 04/02/93 10.48 20.63 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 051,27/93 10.52 20.59 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 AW-6 05/07/91 29.59 10.37 19.22 ND<50 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 081;?1191 10.25 19.34 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 j 111:?6/91 10.88 18.71 ND<30 170 ND<0.30 ND<0.30 ND<0.30 ND<0.30 02/21/92 10.64 18.95 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 30.09 10.89 19.20 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/24/92 10.88 19.21 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 07/20/92 10.85 19.24 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 10/21/92 10.92 19.17 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 01/22/93 10.30 19.79 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 04/02/93 10.58 19.51 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 05/!7193 10.61 19.48 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 i Page 3 of 5