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Footprint Calculations for TPHg Contamination in Groundwater <br /> ARCO Station No 2130 <br /> Stockton, California <br /> ' TPHg 100 ppb Iso concentration contour <br /> Section Area ft^2 <br /> Average long diameter= d = (b+c)/2 260 <br /> ' Ellipse- iO`(a/2)`(d/2) 40,841 <br /> Total Area 100 ppb iso-contour 40,841 ft^2 <br /> ' north of B-9/MW-4 <br /> north of Station Building <br /> ' east of <br /> B-2/MW-1 <br /> c <br /> 2`7fl west of <br /> B-21/MW-6 <br /> b <br /> ' 250 <br /> sdu-lh of a <br /> B-25/MW-10 200 <br /> TPHg 1000 ppb Iso concentration contour <br /> Section Area ft^2 <br /> Average long diameter= d = (b+c)/2 160 <br /> Ellipse= i p(a/2 ` d/2 16,965 <br /> Total Area 1000 ppb Iso-contour 17,125 ft^2 <br /> south of Station Building <br /> east of east of <br /> B-2/MW-1 B-6/MW-2 <br /> c b <br /> 180 140 <br /> a south of <br /> 135 B-25/MW-10 <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 /> 1bp-arcolvem121301engineenng\Arco 2130 NFA talcs kjb XLS <br /> TPHG footprint-WATER 1 of 1 11/17/2003 <br />