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Retardation Factor Calculator Retardation Factor R = 1 + rbkd /q R = retardation factor rb = bulk density = rs(1-q) rs = solids density q = porosity kd = (soil) distribution coefficient = foc Koc foc = fraction organic carbon Koc = organic carbon/water partition coefficient Input Parameters Site Name Date Porosity (q ) (Try 0.25) Fraction Organic Carbon (foc) (Try 0.0001) Chemical Data Source OnSite Default  --------------------  EPA Soil Screening Guidance  EPA Region 9 Preliminary Remediation Goals  EPA Subsurface Remediation Guidance  --------------------  District of Columbia Underground Storage Tank Division  Hawaii Department of Health  Illinois Environmental Protection Agency  Minnesota Pollution Control Agency  New York Spill Response Bureau  Pennsylvania Land Recycling Program  South Carolina Bureau of UST Management  --------------------  BIOSCREEN or BIOCHLOR user guides    Note: Data revision date Chemical benzene  toluene  ethylbenzene  o-xylene  p-xylene  m-xylene  total xylenes  -----------------  (MTBE) methyl tert-butyl ether  (ETBE) ethyl tert-butyl ether  (TAME) tert amyl methyl ether  (DIPE) diispropyl ether  ethanol  (TBA) tert-butyl alcohol  -----------------  (PCE) tetrachloroethene (perchloroethene)  (TCE) trichloroethene  (cDCE) cis-1,2-dichloroethene  (tDCE) trans-1,2-dichloroethene  (1,1DCE) 1,1-dichloroethene  dichloroethene (undifferentiated isomers)  (VC) vinyl chloride or chloroethene  -----------------  (1,1,1,2TeCA) 1,1,1,2-tetrachloroethane  (1,1,2,2TeCA) 1,1,2,2-tetrachloroethane  (1,1,1TCA) 1,1,1-trichloroethane  (1,1,2TCA)1,1,2-trichloroethane  (1,1DCA) 1,1-dichloroethane  (1,2DCA) 1,2-dichloroethane  (CA) chloroethane  -----------------  (CT) carbon tetrachloride (tetrachloromethane)  (TCM) chloroform (trichloromethane)  (DCM) methylene chloride (dichloromethane)  (CM) chloromethane  (TCFM) FREON-1 (trichlorofluoromethane)  (DCDFM) FREON-12 (dichlorodifluoromethane)  (TBM) bromoform (tribromomethane)  (DBCM) dibromochloromethane  (BDCM) bromodichloromethane  -----------------  (1,2DCP) 1,2-dichloropropane  (1,3DCP) 1,3-dichloropropane  -----------------  (1,2DCB) 1,2-dichlorobenzene  (1,3DCB) 1,3-dichlorobenzene  (1,4DCB) 1,4-dichlorobenzene  (CB) chlorobenzene  -----------------  2-chloroethylvinyl ether  other    Default Parameters Solids Density (rs) Default Koc value L/kg Results Bulk Density (rb) g/cm3 kd L/kg Retardation Factor (R)

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Page author: Jim Weaver, of U.S. EPA, Office of Research and Development, Athens Georgia who last modified this content on: October 21, 2002

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