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FORMER MOBIL. BULK TERMINAL 04343, TRACY, CALIFORNIA <br /> CALCULATION OF HEALTH-BASED CRITERIA CLEANUP LEVELS FOR SOIL <br /> VAPOR PATHWAY ANALYSIS <br /> EXPOSURE: POTENTIAL EXPOSURE TO CHEMICALS IN SUBSURFACE SOIL Extra <br /> RECEPTOR EMPLOYEE POPULATION ONTOP OF SITE <br /> SITE CONDITION: PAVED AND DEVELOPED COMMERCIAL AREA — — <br /> EXPOSURE SCENARIO: REASONABLE MAXIMUM EXPOSURE <br /> ENDPOINT: HEALTH-BASED CRI'T'ERIA CLEANUP LEVELS <br /> EQUATIONS: <br /> Risk I Csoil = ARL/Chp <br /> HI/Csoil = AHI 1 Chp <br /> ' SYMBOLS AND DESCRIPTION UNITS VALUES RATIONALE <br /> Risk = Upper-Round Incremental Cancer Risk dimensionless see below (by previous equation) <br /> HI = Hazard Index dimensionless see below (by previous equation) <br /> ARL = Allowable Risk Level dimensionless 1.00E-06 (upper-bound De Minimis risk) <br /> AHI = Allowable Health Index dimensionless 1.00E+00 (by definition) <br /> Csoil Concentration of Chemical in Soil mg/kg see below (95% upper-confidence limit) <br /> Chp Health-Protective Concentration of Chemical in Soil <br /> or Criteria Cleanup Level mg/kg see below (by equations) <br /> Chemical Risk HI Csoil Cho <br /> Benzene 1.89E-07 NA 6.6 3.48E+01 <br /> Toluene NA 5.24E-05 2.4 4.58E+04 <br /> Ethylbenzene NA 6.65E-04 17 2.56E+04 <br /> Xylenes NA 8.23E-04 6.3 7.65E+03 <br />�1 <br /> '1 <br /> 1 <br /> =i <br /> ,1 <br /> i RSKCALC4 <br /> n. <br />