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Footprmt Calculations for Benzene Contammabon In Groundwater <br /> ARCO Station No 2130 <br /> Stockton, California <br /> Benzene 100 ppb iso concentration contour <br /> Section Area ft^2 <br /> South end = 0 75*pio *(a/2)^2 3,927 <br /> North End = 0 5*pi()*(e/2)A2 1,188 <br /> Mid-section= (b-(e/2)]+(a/2))*e 5,363 <br /> Total Area 100 ppb iso-contour 10,477 ft^2 <br /> e <br /> ' <br /> 55 <br /> north of B-9/MW-4 <br /> d b <br /> 45 75 <br /> ' West edge <br /> of property east of <br /> B-11/VW-6 <br /> a <br /> 1 Ott <br /> c south edge of property <br /> 100 <br /> Benzene 1000 ppb iso concentration contour <br /> Section Area ft^2 <br /> Ends= pi()*(a/2)A2 314 <br /> Center= (b-a)*a 2,400 <br /> Total Area 1000 ppb iso-contour 2,714 ft^2 <br /> east of <br /> 8-7/VW-4 centered around <br /> a B-16/MW-5 <br /> ' 20 <br /> ' b northeast of <br /> 144 B-5NW-3 <br /> ' Source RESNA Project No 30003, Plate 12 <br /> • TPHg/Benzene Concentrations in Groundwater(November 29, 1993) <br /> ARCO Facility No 2130, Stockton, California <br /> Ibp-arcolvern121301engmeering\Arco 2130 NFA talcs ktb XL.S <br /> ' Benzene footprint-WATER 1 of 1 11/17/2003 <br />