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Lori — <br />;r <br /> to Ms, Lori Duncan <br /> tre <br /> a`h� TTle 5 e Cr ' <br /> July 8, 1999 . <br /> Page 2 G� d140�S• �: <br /> Calculations-Zone 1 vtS�d• 0 E -ohe ' <br /> F ahs -tl�v�ee in ��he�_ r <br /> Zone i Area= 736 square feet(sf) Area 32 feet by 23 feet -t- <br /> u Depth Intervals= 2.5 feet bgs-7.5 feet bgs(Zone 1 A)and <br /> s <br /> 7.5 feet bgs- 12.5 feet bgs(Zone 1 B) , <br /> i <br /> -,Soil Density(d,)= 90 pounds cubic foot(pcf) <br /> Depth Interval Soil Weight(WS): W,Zone IA-W,Zone 1B <br /> W,,= 736 sf x 5' x 90 pcf=0.33 million pounds <br /> Sr <br /> Average HC-Concentration Zone I A=(14 pp + 18 ppm+0 ppm +0 ppm)/4=8 ppm 1 <br /> Average HC_Concentration Zone IB=(4700 ppm+4800.ppm+ 1200 ppm+ 1800 ppm+0 ppm+0 ppm)16 <br /> =2083 ppm <br /> ':'TPHd Residual Hydrocarbon Mass(Mf{c): MHC=W,(in millions of pounds)x TPHd Concentration <br /> MHC=0.33 x 8 ppm =2.7 pounds(Zone 1A) I <br /> Mxc= 0.33 x 2083 ppm =689.9 pounds(Zone 113) <br /> cA 10 I <br /> Calculations-Zone 2 <br /> Zone 2 Area- 3,465 square feet(sf)=Area 105 feet by 33 feet <br /> Depth Intervals= S 7.5 feet bgs- 12.5 feet bgs <br /> Soil Density(ds)= 90 pounds cubic foot(pcf) <br /> Depth Interval Soil Weight(WS): W,-3,465 sf x 5' x 90 pcf= 1.56 million pounds <br /> . .Average HC Concentration Zone 2 =(3 90 ppm+61.:ppi i+ 11 ppm +0 ppm+0 ppm +0 ppm)/6 j <br /> = 77 ppm I <br /> TPHd Residual Hydrocarbon Mass(MHC): MHC=W,(in millions of pounds)x TPHd Concentration <br /> MHC= 1.56 x 77 ppm= 120.1 pounds(Zone 2) <br /> TOTAL ESTIMATED SITE HYDROCARBON MASS ='812.7 POUNDS i <br /> 1 <br />