C Tier 2 Illustrations and Tables

Section 742.APPENDIX C   Tier 2 Illustrations and Tables Section 742.TABLE C   RBCA Equations Equations for the combined exposures routes of soil ingestion inhalation of vapors and particulates, and dermal contact with soil Remediation Objectives for Carcinogenic Contaminants (mg/kg) R1 Remediation Objectives for Non-carcinogenic Contaminants (mg/kg) R2 Volatilization Factor for Surficial Soils, VF ss (kg/m 3 ) Whichever is less between R3 and R4 R3 R4 Volatilization Factor for Surfici al Soils Regarding Particulates, VF p (kg/m 3 ) R5 Effective Diffusion Coefficient in Soil Based on Vapor-Phase Concentration D s eff (cm 2 /s) R6 Equations for the ambient vapor inhalation (outdoor) route from subsurface soils Remediation Objectives for Carcinogenic Contaminants (mg/kg) R7 Remediation Objectives for Non-carcinogenic Contaminants (mg/kg) R8 Carcinogenic Risk-Based Screening Level for Air, RBSL air (μg/m 3 ) R9 Noncarcino-genic Risk-Based Screening Level for Air, RBSL air (μg/m 3 ) R10 Volatilization Factor - Subsurface Soil to Ambient Air, VF samb (mg/m 3 )/(mg/kg soil ) R11 Equations for the Soil Component of the Ground-water Ingestion Exposure Route Remediation Objective (mg/kg) R12 NOTE:  This equation can only be used to model contaminant migration not in the water bearing unit. Groundwater at the source, GW source (mg/L) R13 Leaching Factor, LF sw (mg/L water )/ (mg/kg soil ) R14 Steady-State Attenuation Along the Centerline of a Dissolved Plume, C (x) /C source R15 NOTE: 1.   This equation does not predict the contaminant flow within bedrock and may not accurately predict downgradient concentrations in the presence of a confining layer. 2.   If the value of the First Order Degradation Constant (λ) is not readily available, then set λ = 0. Longitudinal Dispersivity, a x (cm) R16 Transverse Dispersivity, a y (cm) R17 Vertical Dispersivity, a z (cm) R18 Specific Discharge, U (cm/d) R19 Soil-Water Sorption Coefficient, k s R20 Volumetric Air Content in Vadose Zone Soils, q as (cm 3 air /cm 3 soil ) R21 Volumetric Water Content in Vadose Zone Soils, q ws (cm 3 water /cm 3 soil ) R22 Total Soil Porosity, q T (cm 3 /cm 3 soil ) R23 Groundwater Darcy Velocity, U gw (cm/yr) R24 Equations for the Groundwater Ingestion Exposure Route Remediation Objective for Carcinogenic Contaminants (mg/L) R25 Dissolved Hydrocarbon Concentration along Centerline, C (x) (mg/L water ) R26 NOTE: 1.   This equation does not predict the containment flow within bedrock and may not accurately predict downgradient concentrations in the presence of a confining layer. 2.   If the value of the First Order Degradation Constant (λ) is not readily available, then set λ = 0.