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v <br /> i <br /> GROUNDWATER MASS BALANCE-TPH-G AND BENZENE <br /> NEW JERUSALEM SCHOOL <br />' TRACY, CALIFORNIA <br />, L <br /> Assumptions f <br /> s <br /> • Contaminated GW is in 2 cylindrical zones (inner and outer) <br /> Outer zone encompasses inner zone I <br />+ • Both zones centered on Pz <br /> • Inner zone average concentration 20 mg/L <br /> • Inner zone plume radius 5' <br /> I. L • Outer zone average concentration 10 mg/L <br /> • Outer zone plume radius 10' <br /> • Plume thickness— 5' <br /> L • Porosity--- 35% <br /> TPH-G Benzene <br /> Inner cylinder <br /> V,=71r'h <br /> V,= 3.14x25ft2x5ft <br /> V,= 393 ft' <br /> Port/ = 393 ft- x .35 <br /> PorV = 137 ft' <br /> 137 ft'x 28.32 L/ft' = 3,892 L <br /> 3,892 L x 20 mg/L =77,849 mg 3,892 L x 140 ug/L= 544,880 ug= 0.5 grams <br /> TPH-G —0.078 kg Benzene—0.5 grams <br /> L <br /> Outer cylinder <br /> Vo=nr' h—V, t <br /> Vo= 3.14x 100ft' x5ft-- 393 ft; <br /> Vo=1,177 ft' k <br /> PorV = 1,117ft' x .35 <br /> PorV =412 ft's <br /> 412ft' x28.32L/ ft' = 11,674L <br /> 11,674 L x 10 mg/L= 116,743 mg k <br /> TPH-G = 0.116 kg Benzene—0 grams <br /> TOTAL <br /> E <br /> LTPH-G in Groundwater=0.19 kg Benzene=0.5.grams <br /> j <br /> I <br />