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rr S r r■t r rrl rr +■� +■r � r ,� r r r: r <br /> TAB a 5 <br /> ESTIMATED MASS OF TPH-g AND BENZENE IN GROUNDWATER <br /> CALTRANS-SHOP 10 MAINTENANCE STATION,STOCKTON,CALIFORNIA <br /> FEBRUARY 2000 <br /> Key Equations and Constants <br /> Volume=V,=A,'Z"0 Z=9 60 m <br /> Mass of contaminant=m.=VL'Cc <br /> k=Estimated areal extent of contaminant in groundwater(m') <br /> Z=Saturated thickness=9 60 meters <br /> V,=volume of groundwater impacted with a given contaminant within a given isoconcentration contour(L) <br /> C�=concentration of contaminant(pg/L) <br /> 0=porosity=0 35 (Human Health Risk Assessment Shop 10 February 1999) <br /> m.=mass of contaminant in groundwater(kg) <br /> Total mass=Em, <br /> Sample Calculations <br /> CASE (TPH-G>100 pgtL) k=8,385 m2 z=9 60 m <br /> V,=B 385 mZ"9 60 m'0 35=28,000 m3 <br /> Mass TPH-G=(28 000 m3)(1,000 Llm3)(100 liglL)(10°kgtpg)=2 8 ka <br /> Page 2 of 2 <br />