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FORMER MOBII. BULK TERMINAL 04-343, TRACY, CALIFORNIA <br /> -A CALCULATION OF HEALTH-BASED CRITERIA CLEANUP LEVELS FOR SOIL <br /> d VAPOR PATHWAY ANALYSIS <br /> i- <br /> EXPOSURE: POTENTIAL EXPOSURE TO CHEMICALS IN SUBSURFACE SOIL Extra <br /> RECEPTOR: RETAIL FACILITIES NORTH WEST OF SITE <br /> SITE CONDITION: FENCED, UNPAVED AND UNDEVELOPED <br /> EXPOSURE SCENARIO: REASONABLE MAXIMUM EXPOSURE <br /> ENDPOINT: HEALTH-BASED CRITERIA CLEANUP LEVELS <br /> EQUATIONS: <br /> Risk I Csoil = ARL/Chp <br /> HI 1 Csoil = AHl I Chp <br /> SYMBOLS AND DESCRIPTION UNITS VALUES RATIONALE <br /> F Risk = Upper-Bound 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 mglkg 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 equation) <br /> Chemical Risk HI Csoil Chp <br /> Benzene 6.97E-07 NA 6.6 9.46E+00 <br /> Toluene NA 1.93E-04 2.4 1.24E+04 <br /> Ethylbenzene NA 2.45E-03 17 6.95E+03 <br /> Xylenes NA 3.03E-03 6.3 2.08E+03 <br /> 1, <br /> i <br /> i <br /> f RSKCALC4 <br /> 4 <br />