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1 <br /> Footprint Calculations for TPHg Contamination at 1540 feet bgs <br /> ARCO Station No 2130 <br /> Stockton, California <br /> ' TPHg 1 ppm iso concentration contour <br /> Section Area tt^2 <br /> Ellipse= piQ* a/2 *(b/2) 2,824 <br /> ' Total Area 1 ppm iso-contour 2,824 ft^2 <br /> southern edge of Station Building <br /> west of <br /> ' between AS-3 <br /> B-7NW-4& b <br /> B-17/AS-1 62 <br /> south of a <br /> B-14/VW-9 a58 <br /> TPHg 100 ppm Iso concentration contour <br /> Section Area ft^2 <br /> Ends= piO*(a/2)^2 491 <br /> ' Center= (b-a)*a 500 <br /> Total Area 100 ppm Iso-contour 991 ft^2 <br /> 1 <br /> east of east of <br /> B-5/VW-3 AS-2 <br /> ' b <br /> 45 <br /> ' a between <br /> 25 B-3/VW-1 &B-14/VW-9 <br /> ' Source URS Site Conceptual Model Report, June 2003, <br /> Figure 4 TPHg Distribution in Soil 15-40 Feet BGS <br /> ARCO Facility No 2130, Stockton, California <br /> f Ibp arcolvern121301engineennglArco 2130 NFA calcs ktb XLS <br /> 15-40 ft bgs footprint-SOIL 1 of 1 11/17/2003 <br />