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Ms. Lori. Duncan <br /> June 15, 1999 <br /> Page 2 <br /> Calculations—Zone I <br /> Zone 1 Area= N zvw4i 800 square feet(sf) <br /> Depth Intervals= 5' 2.5 feet bgs—7.5 feet bgs(Zone 1 A)and <br /> 7.5 feet bgs—.12.5 feet bgs(Zone 1 B) <br /> Soil Density(ds)= 90 pounds cubic foot(pct) <br /> Depth Interval Soil Weight(WS): Wg Zone 1A=WS Zone 113 <br /> Ws=Q!"f x 5' x 90 pcf=0.34 million pounds 3�v,oar f <br /> Average HC Concentration Zone I=(14 ppm+ 18 ppm+0 ppm+0 ppm)/4 = 8 ppm a �� <br /> sc3-5 z <br /> Average HC Concentration Zone 1 B=(4700 ppm+4800 ppm+ 1200 ppm+ 1800 ppm+0 ppm+0 ppm)/6 <br /> =2083 ppm 3j <br /> TPHd Residual Hydrocarbon Mass WHO: MHC=W5(in millions of pounds)x TPHd Concentration <br /> MHc=0.34 x 8 ppm=2.7 pounds(Zone IA) �(o <br /> MHc=0.34 x 2083 ppm= 708 pounds(Zonc 1 B) 1)7_; <br /> Calculations—Zone 2 <br /> Zone 2 Area 9 9,200 square feet(sf) 10 ,0 0 0 _'600 <br /> Depth Intervals= 5 l 7.5 feet bgs— 12.5 feet bgs <br /> Soil Density(ds)= 90 pounds cubic foot(pcf) <br /> Depth Interval Soil Weight(WS): Ws=9,200 sf x 5' x 90 pcf=4.14 million pounds p t <br /> Average HC Concentration Zone 2= (7 ppm + 5 ppm+8 ppm+2 ppm+4 ppm+6 ppm+ 10 ppm+9)— ? <br /> ppm+ 11 ppm))1 /7 Ppm <br /> $ko4t�-( -t 9 <br /> TPHd Residual Hydrocarbon Mass(MHc}: MHC=Wg(in millions of pounds)x TPHd Concentration <br /> 'MHC=4.14 x 7 ppm=29 pounds(Zone 2) <br /> I r` <br /> TOTAL ESTIMATED SITE HYDROCARBON MASS = 737 POUNDS <br /> I <br />