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Legend <br /> —— Approximate edge of tank 1,600 Concentration of TEPH-diesel <br /> excavation in mg/kg(ppm) <br /> Exploratory borehole 1 T Concentration of toluene(ppm) <br /> Metal stake 9/E Concentration of ethylbenzene <br /> ® <br /> Exposed copper Piping (Ppm) <br /> —Soil sande 10/X Concentration of xylenes <br /> (Ppm) <br /> -r—IRrojecOon of angled borehole •••••• Diesel-containing soil or bedrock <br /> usso-otut-u in excess of 100 ppm TEP"Iesel <br /> 850-D1 U1 tank excavations ®••••�•�"'''% ` trabelow <br /> detection limit <br /> Scale:Feet <br /> •.••-' 5,00 A. 0 1 2 5 <br /> '• #5 700 I04 <br /> 7,700 #722 1 <br /> is#1 r 1 • <br /> 1 <br /> 42 o. si/E #3 91°°° 1 ! /-2 <br /> 0.006/X polo)( 5,800 1 Y <br /> • I! <br /> o� 1 <br /> �• <br /> '~•••., 4 5,000 ,t i <br /> 1 0.008/T _ • <br /> 12 <br /> 5 <br /> 13 12 <br /> <2 <br /> #11 <br /> <2 <br /> Figure 9. Estimated horizontal extent of soil with TEPH-diesel concentrations greater than 100 ppm at the 850-D1 U1 tank excavation. <br />