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5 <br /> Pump Islands f <br /> I f f l fit; <br /> ARCO Facility 5450 <br /> T-1 • <br /> T-2 <br /> I T-� <br /> l 411 s <br /> 111 <br /> l l 4{14 Product Lines <br /> 5enzene impacted sod T-11 T 1041 r <br /> T-1 1114 — <br /> MW-1 _ _; T-8 <br /> ==— T-9r <br /> T-14-1f 5A a , 12yrf� <br /> benzene -0 087 mg/kg <br /> I � <br /> Fremont 5t <br /> Legend <br /> Monitoring Well Location <br /> Ma55 of benzeneand Number <br /> in 5011 (lbs) =V(f?)-Y(Ib/ft3)C(%weight)O 01 MW-1 <br /> r=5 ft = (835 ft')(116 lb/ft)(0087(0 0001))(0 01) <br /> =00081bs Soil mass balance estimates based on results <br /> h=1063 ft from previous investigations conducted In <br /> { where, October 1995 and July 1996 See Table 1 for <br /> ¢N8 11 V =volume of COC-impacted soil =835 ft3 historical soil analytical results See Appendix 0 <br /> r1� y= unit weight of soil =116 Ib/f;3 for methodology and assumptions used to <br /> C=soil concentration in%weight calculate the mass <br /> 0 15 30 V=n(r)z(h)z = concentration (ppm)/1,000,000 X 0 01 <br /> = rt(5ft) (10 63ft) 0 01 is a mathematical conversion of percent (a) Soil sample T-14 was collected at a depth of <br /> Scale i n Feet =835 ft� 18 inches below trench bottom directly above <br /> sample T-14-115A <br /> B R O W N A N D DA 11 5-15-97 seri. ARCO Facility No 5450, Stockton, California Figure <br /> C A L D W E L L 4870 <br /> T1TLE <br /> PRO,ecT Mass of Residual Benzene In Soil <br /> 2 <br />