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YJ `� 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) Other (mg/Kg) (mg/Kg) Ethyl Benzene Toluene benzene Xylenes MtBE 5 nd nd nd nd nd nd 10 1 .7 nd nd nd nd 1 .31 15 nd nd nd nd nd 0.24 MW-15 20 -- nd nd nd nd nd nd 25 nd nd nd nd nd nd 30 nd nd nd nd nd nd 35 nd nd nd nd nd 0.0106 40nd nd nd nd nd nd 5 nd nd nd nd nd nd 10 nd nd nd nd nd nd 15 nd nd nd nd nd 0. 132 MW-16 20 - nd nd nd nd nd nd 25 nd nd nd ad nd nd Jan-04 30 - nd nd nd nd nd nd 35 nd nd nd nd nd nd 40 nd nd nd nd nd nd 5 nd nd nd nd nd nd MW-17 10 — nd nd nd nd nd nd 15 nd nd nd nd nd 0. 101 20 nd nd nd nd nd 0.022 5 nd nd nd nd nd nd 10 1 .2 nd nd nd nd 0.957 15 nd nd nd nd nd 0.045 MW-18 20 -- nd nd nd nd nd nd 25 nd nd nd nd nd nd 30 nd nd nd nd nd nd 35 nd nd nd nd nd nd 40 nd nd nd nd nd nd 5 0.6 nd nd nd nd nd MW- 19 10 - 217 nd nd 4.66 2.27 0.307 - 15 nd nd nd nd nd nd 20 nd nd nd nd nd nd 5 nd nd nd nd nd nd Aug-05 MW-20 10 -- nd nd nd nd nd nd 15 nd nd nd nd nd 0.227 20 nd nd nd nd nd nd - 5 nd nd nd nd nd nd MW-21 10 -- 211 1 .08 1 nd 3.75 7.9 nd 15 R759 nd nd nd nd n& 0 7 20 4 0 • th0 At 0 'ntr . 0 0.009 - 5 nd nd nd nd nd MW-22 10 -- 8.86 1 .31 12.6 78.9 33.7 15 nd nd nd nd 0.009 Sep-06 20 — nd nd nd 0.006 0.009 it 5 nd nd nd nd nd MW 23. 10 -- 1 .55 0. 195 16.4 1 .22 2.01 15 0.003 nd 0.009 0.006 0.069 20 1 .9 it 13 nd 0.057 1 0.039 1 0.014 WIXEflFID Es OCI MTElUIM %me n