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Footprint Calculations for TPHg Contamination at 40-60 feet bgs <br /> ARCO Station No 2130 <br /> Stockton, California <br /> TPHg 1 ppm iso concentration contour <br /> ' Section Area ftA2 <br /> Ends= pO*(a/2)A2 4418 <br /> Center= (b-a)*a 4875 <br /> Total Area 1 ppm Iso-contour 9293 ft^2 <br /> north of B-4/VW-2 <br /> Through southern mid-section of <br /> Station Building <br /> east of AS-3 <br /> a <br /> b 75 <br /> 144 sou f B-14/VW-9 <br /> TPHg 100 ppm iso concen ration contour <br /> ' Section Area ftA2 <br /> South End= 0 5*pi{)*(a/2)A2 88 <br /> East End= 0 5*pi()*(e/2)A2 245 <br /> Northwest Corner= (c-a)*a 375 <br /> North Central= c-d)*(b-e/2) 813 <br /> Total Area 100 ppm iso-contour 1521 ft^2 <br /> ' South of Station Building <br /> West of east of <br /> B-13/VW-8 e B-11/VW-6 <br /> & c 25 <br /> B-7/VW-4 4D D I Ir <br /> ' d.—; <br /> 15 <br /> ' a b <br /> on- <br /> Is 4$ <br /> ' Source URS Site Conceptual Model Report, June 2003, <br /> • Figure 5 TPHg Distribution in Soil 40-60 Feet BGS <br /> ARCO Facility No 2130, Stockton, California <br /> 1bp-arco%vern121301engineering\Arco 2130 NFA talcs iqb XLS <br /> 40-60 ft bgs footprint-SOIL 1 of 1 11/17/2003 <br />