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February 2005 Excavation <br /> North Confirmation Samples[nd] South <br /> MW105 Mw4/ <br /> 0 MW5 Mw4B EB4 B11 B7 <br /> .......... .......... ........... . <br /> Fill Silty Clay Silty Clay <br /> 5 ..... ........ ............... ................... <br /> Silty Clay nd ...... ...... Med. Sand <br /> 10 nd nd V <br /> - -............IN nd] <br /> -7 Med. Sand <br /> Med. jrndjj---��nd <br /> Silty Clay <br /> nd <br /> 15 nd nd <br /> 20 _Z 1-4 Silty Clay <br /> nd (nd) nd <br /> 25 (nd) Silty Clay — _------------------------------ <br /> ' 30 nd Med. Sand <br /> 35 0 20 40 60 <br /> Med. Sand feet <br /> 040 nd(nd) MTBE Conoentrations <br /> 45 Soil ug/kg <br /> Water(ug/1) 4/13/06 <br /> Pre Excavation Contarnintation Contours ------- <br /> 50 Post Excavation Contamintation Contours <br /> Figure 30 Pornbo Ranch <br /> North to South MTBE Cross Section <br />