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Remedial Action Plan RE: 425 W. Larch Street, Tracy, CA October 1 , 2008 W&A Project No.: FTIM-08-002 Summary of Historical Soil Sample Analyses Frontier Transportation, Inc. 425 W. Larch Road Tracy, CA 95376 Borehole / Aromatic Compounds (mg/Kg) Oxygenates Date Well / Depth TPHd TPHg (mg/Kg) (mg/Kg) (mg/Kg) Benzene Toluene Ethyl Xylenes MtBE Other benzene Boreholes S- 1 3 nd nd nd nd nd nd 0.089 S-2 3 nd nd nd nd nd nd 0. 19 B 1 6 -- nd 0.045 nd nd 0.005 0.096 11 330 1 .5 0.87 2.8 0.86 nd B-2 6 -- 5.6 0.21 0.079 0.009 0.044 30.5 9.5 1200 14.4 17.3 37.5 190 19.8 6 -- nd 0.08 nd nd nd 0.91 Aug-96 B-3 11 1200 5.8 6.9 28.6 76.8 7.9 B-4 6.8 - 34 nd 1 0.3 0. 15 0.79 15 10.2 1300 21 .5 40.4 29.8 89 110 MW- 1 RA 10 540 8.7 45 .8 16.7 70. 1 19.9 MW- 1 RB 10 530 7.2 22.8 20 45 . 1 10 MW-2 RA 10 340 3.23 4. 13 7.54 27.9 nd MW-2 11 104 0.14 0.29 1 .6 3 .2 nd MW-3 11 340 3.8 3.5 8.6 27 14.2 5 nd nd nd nd nd nd nd 10 nd nd nd nd nd nd nd MW-4 15 nd nd nd I nd nd I nd nd 20 nd nd nd nd nd nd nd 25 " nd nd nd nd nd nd nd 5 nd nd nd nd nd nd nd MW-5 10 nd nd nd nd nd nd nd 15 nd nd nd nd nd nd nd Jan-98 20 nd nd nd nd nd nd nd 5 nd nd nd - nd nd nd nd MW-610 nd nd nd nd nd nd nd 15 nd nd nd nd nd nd nd 20 nd nd nd nd nd nd nd 5 nd nd nd nd nd nd nd MW-7 10 nd nd nd nd nd nd nd 15 nd nd nd nd nd nd nd 20 nd nd nd nd nd nd nd 5 nd nd nd nd nd nd B-5 10 -- nd nd nd nd nd nd 15 nd nd nd nd nd nd 20 nd nd I nd nd I nd nd 5 -- nd nd I nd nd nd nd 10 -- 100 Q 700 0.653 1 L000 590 15 4f B-6 15 - nd p, 17 66012 o .i05 nd 0 .054 20 nd 0.61 p101 nd nd nd 15 25 nd d nd nd nd 30 -- nd nd nd nd nd nd 0. 130 5 nd nd nd nd nd nd Jan-00 MW-8 ] 0 -- nd nd nd nd nd nd 20 nd nd nd I nd nd nd WIaFFIFIu E RsscCIATFs, INC.