The Risk Assessment Information System

Air Transport Calculators for PEF


PEF - Particulate Emission Factor Wind Driven
PEFsc - Particulate Emission Factor Mechanically Driven - Unpaved Road Traffic
PEF'sc Particulate Emission Factor - Other Construction Activities
PEFoff - Mechanical Particulate Emission Factor for Off-site Receptors (Standard Vehicle Traffic)
PEF'off Mechanical Particulate Emission Factor for Off-site Receptors (Other Construction Activities)
Transport Concentrations

Nonradionuclide Equation


Radionuclide Equation


Enter Beginning Soil Concentration


Resulting Air Concentration - PEF Wind Driven


Resulting Air Concentration - Mechanical PEFoff for Off-site Receptors (Standard Vehicle Traffic)


Resulting Air Concentration - PEFsc Mechanically Driven - Unpaved Road Traffic


Resulting Air Concentration - PEF`sc - Other Construction Activities


Resulting Air Concentration - Mechanical PEF`off for Off-site Receptors (Other Construction Activity)


Particulate Emission Factor Wind Driven

PEF Equation


  City (Climatic Zone) - Selection based on most likely climatic conditions for the site










NOTES:
  1. The Q/Cwind equation and the dispersion constants A, B and C were taken from Exhibit D-2 of the Supplemental Soil Screening Guidance.
  2. A, B, C = PEF region-specific dispersion constants (unitless)
  3. F(x) values for each city are taken from the Soil Screening Guidance Technical Background Document Appendix D Table 2.
Time Spent on Site








NOTES:
  1. tc = ED * EW * 7 days/week * 24 hours/day
  2. Tt = ED * EF * ET * 3600 s/hour
  3. FD = 0.1852 + (5.3537/tc) + (-9.6318/tc2)

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Subchronic Particulate Emission Factor Mechanically Driven - Unpaved Road Traffic

PEFsc Equation






















NOTES:
  1. Contact your regional risk assessor for assistance.
  2. When calculating ΣVKT, distance (road length) is calculated by assuming the contaminated area of surface soil (As) is a square and that the road divides the square evenly. For example, if As is 0.5 acres (Asurf = 2,024 m2), the road length would be the square root of 2,024, or .045 km.
  3. The Q/Csr equation and dispersion constants A, B and C were taken from Equation E-19 of the Supplemental Soil Screening Guidance.
  4. The PEF equation is Equation E-18 in the Supplemental Soil Screening Guidance.
Subchronic Particulate Emission Factor - Other Construction Activities

PEF`sc Equation







































NOTES:
  1. Contact your regional risk assessor for assistance.
  2. The Q/Csa equation and the dispersion constants A, B and C were taken from Equation E-15 of the Supplemental Soil Screening Guidance.
  3. The PEF equation is from Equation E-26 in the Supplemental Soil Screening Guidance.
Mechanical Particulate Emission Factor for Off-site Receptors (Standard Vehicle Traffic)

PEFoff






  City (Climatic Zone) - Selection based on most likely climatic conditions for the site



















NOTES:
  1. The Q/Coff equation and the dispersion constants A, B and C were taken from Exhibit E-5 of the Supplemental Soil Screening Guidance.
  2. The PEF equation is from Equation E-29 in the Supplemental Soil Screening Guidance.
Mechanical Particulate Emission Factor for Off-site Receptors (Other Construction Activities)

PEF`off







































NOTES:
  1. The Q/Coff equation is from Equation E-29 and the dispersion constants A, B and C were taken from Exhibit E-5 of the Supplemental Soil Screening Guidance.
  2. The PEF equation is from Equation E-25 in the Supplemental Soil Screening Guidance.

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