VISL Equations
On this page:
- Resident Air Screening Level
- Worker Air Screening Level
- Groundwater Screening Level
- Soil Gas Screening Level
- Vapor Intrusion Screening Level Supporting Equations
- Indoor Air Concentration Derived from Soil Gas Concentration
- Indoor Air Concentration Derived from Groundwater Concentration
- Calculation of Risks and Hazards from Indoor Air Concentrations
- Resident Air Chronic Daily Intakes (CDI)
- Worker Air Chronic Daily Intakes (CDI)
- Using Unit's in ppb
- Modifications of Groundwater Temperatures
Resident Air Screening Level
Noncarcinogenic
Inhalation
![VISL Resident Air Noncarcinogenic](/system/files/styles/large/private/images/2021-11/visl_res_air_inhn.png?itok=HZdr17i5)
Carcinogenic
Inhalation
![](/system/files/styles/large/private/images/2021-11/visl_res_air_inhc.png?itok=rlgc3AKC)
Mutagenic
Inhalation
![VISL Resident Air Mutagenic](/system/files/styles/large/private/images/2021-11/visl_res_air_inhmu.png?itok=xMmnpGpT)
Vinyl Chloride
Inhalation
![VISL Resident Air Vinyl Chloride](/system/files/styles/large/private/images/2021-11/visl_res_air_inhvc.png?itok=mBRBchcu)
Trichloroethylene
Inhalation
![](/system/files/styles/large/private/images/2021-11/visl_res_air_inhtce.png?itok=sDsFfocg)
- Trichloroethylene Supporting Equation
Worker Air Screening Level
Noncarcinogenic
Inhalation
![](/system/files/styles/large/private/images/2021-11/visl_com_air_inhn.png?itok=mhHZwCiL)
Carcinogenic
Inhalation
![](/system/files/styles/large/private/images/2021-11/visl_com_air_inhc.png?itok=0R4taHNy)
Groundwater Screening Level
![](/system/files/styles/large/private/images/2021-11/gwia.png?itok=nuuBh2PO)
Soil Gas Screening Level
![](/system/files/styles/large/private/images/2021-11/ssia.png?itok=A4WZXQOc)
Vapor Intrusion Screening Level Supporting Equations
- Pure Phase Vapor Concentration
- Groundwater Vapor Concentration
Indoor Air Concentration Derived from Soil Gas Concentration
- Calculated Indoor Air Concentration from Soil Gas
Indoor Air Concentration Derived from Groundwater Concentration
- Calculated Indoor Air Concentration from Groundwater
Calculation of Risks and Hazards from Indoor Air Concentrations
- Excess Lifetime Cancer Risk
- Hazard Quotient
Resident Air Chronic Daily Intakes (CDI)
Noncarcinogenic
![](/system/files/styles/large/private/images/2021-11/vcdi_res_air_inhn.png?itok=anXMRUsh)
Carcinogenic
![](/system/files/styles/large/private/images/2021-11/vcdi_res_air_inhc.png?itok=FkzT-JUi)
Mutagenic
![](/system/files/styles/large/private/images/2021-11/vcdi_res_air_inhmu.png?itok=ezZVkAB-)
Vinyl Chloride
![](/system/files/styles/large/private/images/2021-11/vcdi_res_air_inhvc.png?itok=2EGlcUms)
Trichloroethylene
![](/system/files/styles/large/private/images/2021-11/vcdi_res_air_inhtce.png?itok=fTuAgOqC)
- Trichloroethylene Supporting Equation
Worker Air Chronic Daily Intakes (CDI)
Noncarcinogenic
![](/system/files/styles/large/private/images/2021-11/vcdi_com_air_inhn.png?itok=pYi4rBBS)
Carcinogenic
![](/system/files/styles/large/private/images/2021-11/vcdi_com_air_inhc.png?itok=0QmqHTM4)
Using Units in ppb
- ppb Unit Conversion
Modifications of Groundwater Temperatures
To Determine Unitless Henry's Law Constant at a Groundwater Temperature of 25° Celsius
![](/system/files/styles/large/private/images/2021-11/hlc.png?itok=zl9TqxSe)
To Determine Unitless Henry's Law Constant at a Groundwater Temperature other than 25° Celsius
![](/system/files/styles/large/private/images/2021-11/hprime.png?itok=_pPn9nGq)
To Determine Vapor Pressure at a Groundwater Temperature other than 25° Celsius
![](/system/files/styles/large/private/images/2021-11/vptgw.png?itok=IA5wqhHu)
To Determine Pure Phase Vapor Concentration at a Groundwater Temperature other than 25° Celsius
![](/system/files/styles/large/private/images/2021-11/cvptgw.png?itok=lGwFAsO6)