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ir 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 _meet) {ppb} (gip (ppW f/rpW AW-7 05/07/91 29.60 9.73 19.87 ND<50 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 08/21/91 9.63 19.97 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 11/26/91 10.21 19.39 ND<30 300 ND<0.30 ND<0.30 ND<0.30 ND<0.30 I 02/21/92 9.97 19.63 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 30.10 10.22 19.88 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/24/92 10.21 19.89 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 07/20/92 10.22 19.88 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 10/21/92 10.25 19.85 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 01/22J93 9.64 20.46 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 04/02/93 9.94 20.16 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 05/27/93 9.98 20.12 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 I AW-8 05/07/91 28.46 9.55 18.91 ND<50 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 08/21/91 9.48 18.98 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 11/26/91 10.04 18.42 ND<30 100 ND<0.30 ND<0.30 ND<0.30 ND<0.30 02/21/92 9.74 18.72 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/07/92 28.96 10.05 18.91 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 04/24/92 10.03 18.93 ND<30 ND<50 ND<0.30 ND<0.30 ND<0.30 ND<0.30 07/20/92 10.07 18.89 ND<50 63 ND<0.5 ND<0.5 ND<0.5 ND<0.5 10/21192 10.09 18.87 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 i 01/:2/93 9.29 19.67 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 04/02/93 9.64 19.32 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 05/27/93 9.73 19.23 ND<50 ND<5 0 ND<0.5 ND<0.5 ND<0.5 ND<0.5 I I, Page 4 of 5