Table 1. Resident Soil Equation Parameters (Under 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIres<40"-soil-nc-ing | Resident Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-nc-der | Resident Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-ca-ing | Resident Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-ca-der | Resident Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Volatiles(µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres<40"-soil-mu-ing | Resident Soil Mutagenic Ingestion (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres<40"-soil-mu-der | Resident Soil Mutagenic Dermal (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres<40"-soil-mu-inh | Resident Soil Mutagenic Inhalation of Volatiles (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres<40"-soil-mu-inh | Resident Soil Mutagenic Inhalation of Particulates (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres<40"-soil-mu-tot | Resident Soil Mutagenic Total (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres<40"-soil-ca-vc-ing | Resident Soil Carcinogenic Vinyl Chloride Ingestion (mg/kg-day) | Vinyl Chloride -specific | Determined in this calculator |
| CDIres<40"-soil-ca-vc-der | Resident Soil Carcinogenic Vinyl Chloride Dermal (mg/kg-day) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres<40"-soil-ca-vc-inh | Resident Soil Carcinogenic Vinyl Chloride Inhalation of Volatiles (µg/m3) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres<40"-soil-ca-tce-ing | Resident Soil Carcinogenic Trichloroethylene Ingestion (mg/kg-day) | Trichloroethylene -specific | Determined in this calculator |
| CDIres<40"-soil-ca-tce-der | Resident Soil Carcinogenic Trichloroethylene Dermal (mg/kg-day) | Trichloroethylene-specific | Determined in this calculator |
| CDIres<40"-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Volatiles (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| CDIres<40"-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Particulates (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| BWressa | Body Weight - adult (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BWressc | Body Weight - child (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW0-2 | Body Weight - 0-2 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW2-6 | Body Weight - 2-6 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW6-16 | Body Weight - 6-16 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BW16-26 | Body Weight - 16-26 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDress | Exposure Duration - adult + child (years) | 26 | EPA 2011, Table 16-108; 90th percentile for current residence time. |
| EDressa | Exposure Duration - adult (years) | 20 | EDr (26 years) - EDc (6 years) |
| EDressc | Exposure Duration - child (years) | 6 | U.S. EPA 1991a (pg. 15) |
| ED0-2 | Exposure Duration - 0-2 Years (years) | 2 | U.S. EPA 1991a (pg. 15) |
| ED2-6 | Exposure Duration - 2-6 Years (years) | 4 | U.S. EPA 1991a (pg. 15) |
| ED6-16 | Exposure Duration - 6-16 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| ED16-26 | Exposure Duration - 16-26 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| EFress<40" | Exposure Frequency - adult + child (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EFressa<40" | Exposure Frequency - adult (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EFressc<40" | Exposure Frequency - child (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EF0-2<40" | Exposure Frequency - 0-2 Years (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EF2-6<40" | Exposure Frequency - 2-6 Years (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EF6-16<40" | Exposure Frequency - 6-16 Years (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| EF16-26<40" | Exposure Frequency - 16-26 Years (days/year) | 270 | U.S. EPA 1991a (pg. 15) |
| ETress | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET0-2 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET2-6 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET6-16 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET16-26 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| IRSressc | Ingestion Rate - Child (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRSressa | Ingestion Rate - Adult (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS0-2 | Ingestion Rate - 0-2 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS2-6 | Ingestion Rate - 2-6 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS6-16 | Ingestion Rate - 6-16 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS16-26 | Ingestion Rate - 16-26 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IFSres<40"-adj | Ingestion Rate - Age-adjusted (mg/kg) | 28,350 | Calculated using the age-adjusted intake factors equation |
| IFSMres<40"-adj | Mutagenic Ingestion Rate - Age-adjusted (mg/kg) | 128,700 | Calculated using the mutagenic age-adjusted intake factors equation |
| AFressc | Adherence factor-child (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AFressa | Adherence factor-adult (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF0-2 | Adherence factor 0-2 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF2-6 | Adherence factor 2-6 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF6-16 | Adherence factor 6-16 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF16-26 | Adherence factor 16-26 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| DFSres<40"-adj | Dermal contact factor- age-adjusted (mg/kg) | 79,758 | Calculated using the age-adjusted intake factors equation |
| DFSMres<40"-adj | Mutagenic dermal contact factor- age-adjusted (mg/kg) | 330,372 | Calculated using the mutagenic age-adjusted intake factors equation |
| SAressc | Surface area - child (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SAressa | Surface area - adult (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA0-2 | Surface area 0-2 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA2-6 | Surface area 2-6 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA6-16 | Surface area 6-16 years (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA16-26 | Surface area 16-26 (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| ATress | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 2. Resident Soil Equation Parameters (Over 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIres>40"-soil-nc-ing | Resident Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-nc-der | Resident Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-ca-ing | Resident Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-ca-der | Resident Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Volatiles(µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres>40"-soil-mu-ing | Resident Soil Mutagenic Ingestion (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres>40"-soil-mu-der | Resident Soil Mutagenic Dermal (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres>40"-soil-mu-inh | Resident Soil Mutagenic Inhalation of Volatiles (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres>40"-soil-mu-inh | Resident Soil Mutagenic Inhalation of Particulates (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres>40"-soil-mu-tot | Resident Soil Mutagenic Total (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres>40"-soil-ca-vc-ing | Resident Soil Carcinogenic Vinyl Chloride Ingestion (mg/kg-day) | Vinyl Chloride -specific | Determined in this calculator |
| CDIres>40"-soil-ca-vc-der | Resident Soil Carcinogenic Vinyl Chloride Dermal (mg/kg-day) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres>40"-soil-ca-vc-inh | Resident Soil Carcinogenic Vinyl Chloride Inhalation of Volatiles (µg/m3) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres>40"-soil-ca-tce-ing | Resident Soil Carcinogenic Trichloroethylene Ingestion (mg/kg-day) | Trichloroethylene -specific | Determined in this calculator |
| CDIres>40"-soil-ca-tce-der | Resident Soil Carcinogenic Trichloroethylene Dermal (mg/kg-day) | Trichloroethylene-specific | Determined in this calculator |
| CDIres>40"-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Volatiles (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| CDIres>40"-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Particulates (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| BWressa | Body Weight - adult (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BWressc | Body Weight - child (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW0-2 | Body Weight - 0-2 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW2-6 | Body Weight - 2-6 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW6-16 | Body Weight - 6-16 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BW16-26 | Body Weight - 16-26 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDress | Exposure Duration - adult + child (years) | 26 | EPA 2011, Table 16-108; 90th percentile for current residence time. |
| EDressa | Exposure Duration - adult (years) | 20 | EDr (26 years) - EDc (6 years) |
| EDressc | Exposure Duration - child (years) | 6 | U.S. EPA 1991a (pg. 15) |
| ED0-2 | Exposure Duration - 0-2 Years (years) | 2 | U.S. EPA 1991a (pg. 15) |
| ED2-6 | Exposure Duration - 2-6 Years (years) | 4 | U.S. EPA 1991a (pg. 15) |
| ED6-16 | Exposure Duration - 6-16 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| ED16-26 | Exposure Duration - 16-26 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| EFress>40" | Exposure Frequency - adult + child (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EFressa>40" | Exposure Frequency - adult (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EFressc>40" | Exposure Frequency - child (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EF0-2>40" | Exposure Frequency - 0-2 Years (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EF2-6>40" | Exposure Frequency - 2-6 Years (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EF6-16>40" | Exposure Frequency - 6-16 Years (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| EF16-26>40" | Exposure Frequency - 16-26 Years (days/year) | 330 | U.S. EPA 1991a (pg. 15) |
| ETress | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET0-2 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET2-6 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET6-16 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET16-26 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| IRSressc | Ingestion Rate - Child (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRSressa | Ingestion Rate - Adult (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS0-2 | Ingestion Rate - 0-2 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS2-6 | Ingestion Rate - 2-6 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS6-16 | Ingestion Rate - 6-16 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS16-26 | Ingestion Rate - 16-26 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IFSres>40"-adj | Ingestion Rate - Age-adjusted (mg/kg) | 34,650 | Calculated using the age-adjusted intake factors equation |
| IFSMres>40"-adj | Mutagenic Ingestion Rate - Age-adjusted (mg/kg) | 157,300 | Calculated using the mutagenic age-adjusted intake factors equation |
| AFressc | Adherence factor-child (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AFressa | Adherence factor-adult (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF0-2 | Adherence factor 0-2 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF2-6 | Adherence factor 2-6 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF6-16 | Adherence factor 6-16 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF16-26 | Adherence factor 16-26 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| DFSres>40"-adj | Dermal contact factor- age-adjusted (mg/kg) | 97482 | Calculated using the age-adjusted intake factors equation |
| DFSMres>40"-adj | Mutagenic dermal contact factor- age-adjusted (mg/kg) | 403,788 | Calculated using the mutagenic age-adjusted intake factors equation |
| SAressc | Surface area - child (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SAressa | Surface area - adult (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA0-2 | Surface area 0-2 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA2-6 | Surface area 2-6 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA6-16 | Surface area 6-16 years (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA16-26 | Surface area 16-26 (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| ATress | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 3. Resident Soil Equation Parameters (Arctic zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIres-arctic-soil-nc-ing | Resident Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-nc-der | Resident Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-nc-inh | Resident Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-ing | Resident Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-der | Resident Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-inh | Resident Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIres-arctic-soil-mu-ing | Resident Soil Mutagenic Ingestion (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres-arctic-soil-mu-der | Resident Soil Mutagenic Dermal (mg/kg-day) | Mutagen-specific | Determined in this calculator |
| CDIres-arctic-soil-mu-inh | Resident Soil Mutagenic Inhalation of Volatiles (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres-arctic-soil-mu-inh | Resident Soil Mutagenic Inhalation of Particulates (µg/m3) | Mutagen-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-vc-ing | Resident Soil Carcinogenic Vinyl Chloride Ingestion (mg/kg-day) | Vinyl Chloride -specific | Determined in this calculator |
| CDIres-arctic-soil-ca-vc-der | Resident Soil Carcinogenic Vinyl Chloride Dermal (mg/kg-day) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-vc-inh | Resident Soil Carcinogenic Vinyl Chloride Inhalation of Volatiles (µg/m3) | Vinyl Chloride-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-tce-ing | Resident Soil Carcinogenic Trichloroethylene Ingestion (mg/kg-day) | Trichloroethylene -specific | Determined in this calculator |
| CDIres-arctic-soil-ca-tce-der | Resident Soil Carcinogenic Trichloroethylene Dermal (mg/kg-day) | Trichloroethylene-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Volatiles (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| CDIres-arctic-soil-ca-tce-inh | Resident Soil Carcinogenic Trichloroethylene Inhalation of Particulates (µg/m3) | Trichloroethylene-specific | Determined in this calculator |
| BWressa | Body Weight - adult (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BWressc | Body Weight - child (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW0-2 | Body Weight - 0-2 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW2-6 | Body Weight - 2-6 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW6-16 | Body Weight - 6-16 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BW16-26 | Body Weight - 16-26 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDress | Exposure Duration - adult + child (years) | 26 | EPA 2011, Table 16-108; 90th percentile for current residence time. |
| EDressa | Exposure Duration - adult (years) | 20 | EDr (26 years) - EDc (6 years) |
| EDressc | Exposure Duration - child (years) | 6 | U.S. EPA 1991a (pg. 15) |
| ED0-2 | Exposure Duration - 0-2 Years (years) | 2 | U.S. EPA 1991a (pg. 15) |
| ED2-6 | Exposure Duration - 2-6 Years (years) | 4 | U.S. EPA 1991a (pg. 15) |
| ED6-16 | Exposure Duration - 6-16 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| ED16-26 | Exposure Duration - 16-26 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| EFress-arctic | Exposure Frequency - adult + child (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EFressa-arctic | Exposure Frequency - adult (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EFressc-arctic | Exposure Frequency - child (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EF0-2-arctic | Exposure Frequency - 0-2 Years (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EF2-6-arctic | Exposure Frequency - 2-6 Years (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EF6-16-arctic | Exposure Frequency - 6-16 Years (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| EF16-26-arctic | Exposure Frequency - 16-26 Years (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| ETress | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET0-2 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET2-6 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET6-16 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ET16-26 | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| IRSressc | Ingestion Rate - Child (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRSressa | Ingestion Rate - Adult (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS0-2 | Ingestion Rate - 0-2 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS2-6 | Ingestion Rate - 2-6 years (mg/day) | 200 | U.S. EPA 1991a (pg. 15) |
| IRS6-16 | Ingestion Rate - 6-16 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IRS16-26 | Ingestion Rate - 16-26 years (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| IFSres-arctic-adj | Ingestion Rate - Age-adjusted (mg/kg) | 21,000 | Calculated using the age-adjusted intake factors equation |
| IFSMres-arctic-adj | Mutagenic Ingestion Rate - Age-adjusted (mg/kg) | 95,333 | Calculated using the mutagenic age-adjusted intake factors equation |
| AFressc | Adherence factor-child (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AFressa | Adherence factor-adult (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF0-2 | Adherence factor 0-2 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF2-6 | Adherence factor 2-6 years (mg/cm2) | 0.2 | U.S. EPA 2002 (Exhibit 1-2) |
| AF6-16 | Adherence factor 6-16 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| AF16-26 | Adherence factor 16-26 years (mg/cm2) | 0.07 | U.S. EPA 2002 (Exhibit 1-2) |
| DFSres-arctic-adj | Dermal contact factor- age-adjusted (mg/kg) | 59,080 | Calculated using the age-adjusted intake factors equation |
| DFSMres-arctic-adj | Mutagenic dermal contact factor- age-adjusted (mg/kg) | 244,720 | Calculated using the mutagenic age-adjusted intake factors equation |
| SAressc | Surface area - child (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SAressa | Surface area - adult (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA0-2 | Surface area 0-2 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA2-6 | Surface area 2-6 years (cm2) | 2373 | U.S. EPA 2011, Tables 7-2 and 7-8; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, birth to < 6 years)(forearm and lower leg-specific data used when available, ratios for nearest available age group used elsewhere. |
| SA6-16 | Surface area 6-16 years (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| SA16-26 | Surface area 16-26 (cm2) | 6032 | U.S. EPA 2011, Tables 7-2 and 7-12; weighted average of mean values for head, hands, forearms, lower legs, and feet (male and female, 21+ years)(forearm and lower leg-specific data used for males and female lower leg; ratio of male forearm to arm applied to female arm data. |
| ATress | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 4. Outdoor Worker Soil Equation Parameters (Under 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIow<40"-sol-nc-ing | Outdoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-nc-der | Outdoor Worker Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-ca-ing | Outdoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-ca-der | Outdoor Worker Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow<40"-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWow | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDow | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFow<40" | Exposure Frequency (days/year) | 225 | U.S. EPA 1991a (pg. 15) |
| ETow | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSow | Ingestion Rate (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| AFow | Adherence factor (mg/cm2) | 0.12 | U.S. EPA 2002 (Exhibit 1-2) |
| SAow | Surface area (cm2) | 3527 | US EPA 2011, Table 7-2; weighted avergae of mean values for head, hands, and forearms (male and female), 21+years) |
| ATow | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 5. Outdoor Worker Soil Equation Parameters (Over 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIow>40"-sol-nc-ing | Outdoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-nc-der | Outdoor Worker Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Particulates(mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-ca-ing | Outdoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-ca-der | Outdoor Worker Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow>40"-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWow | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDow | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFow>40" | Exposure Frequency (days/year) | 225 | U.S. EPA 1991a (pg. 15) |
| ETow | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSow | Ingestion Rate (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| AFow | Adherence factor (mg/cm2) | 0.12 | U.S. EPA 2011, Table 7-20 and Section 7.2.2; arithmetic mean of weighted average of body part- specific (hands, forearms, and face) mean adherence factors for adult commercial/industrial activities |
| SAow | Surface area (cm2) | 3527 | US EPA 2011, Table 7-2; weighted avergae of mean values for head, hands, and forearms (male and female), 21+years) |
| ATow | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 6. Outdoor Worker Soil Equation Parameters (Arctic zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIow-arctic-sol-nc-ing | Outdoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-nc-der | Outdoor Worker Soil Noncarcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Volatiles(mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-nc-inh | Outdoor Worker Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-ca-ing | Outdoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-ca-der | Outdoor Worker Soil Carcinogenic Dermal (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIow-arctic-sol-ca-inh | Outdoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWow | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDow | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFow-arctic | Exposure Frequency (days/year) | 200 | U.S. EPA 1991a (pg. 15) |
| ETow | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSow | Ingestion Rate (mg/day) | 100 | U.S. EPA 1991a (pg. 15) |
| AFow | Adherence factor (mg/cm2) | 0.12 | U.S. EPA 2011, Table 7-20 and Section 7.2.2; arithmetic mean of weighted average of body part- specific (hands, forearms, and face) mean adherence factors for adult commercial/industrial activities |
| SAow | Surface area (cm2) | 3527 | US EPA 2011, Table 7-2; weighted avergae of mean values for head, hands, and forearms (male and female), 21+years) |
| ATow | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 7. Indoor Worker Soil Landuse Equation Variable Parameters (Under 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIiw<40"-nc-ing | Indoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw<40"-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw<40"-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw<40"-ca-ing | Indoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw<40"-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw<40"-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWiw | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDiw | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFiw | Exposure Frequency (days/year) | 250 | U.S. EPA 1991a (pg. 15) |
| ETiw | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSiw | Soil Ingestion Rate (mg/day) | 50 | U.S. EPA 1991a (pg. 15) |
| ATiw | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 8. Indoor Worker Soil Landuse Equation Variable Parameters (Over 40" of annual precipitation zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIiw>40"-nc-ing | Indoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw>40"-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw>40"-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw>40"-ca-ing | Indoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw>40"-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw>40"-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWiw | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDiw | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFiw | Exposure Frequency (days/year) | 250 | U.S. EPA 1991a (pg. 15) |
| ETiw | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSiw | Soil Ingestion Rate (mg/day) | 50 | U.S. EPA 1991a (pg. 15) |
| ATiw | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 9. Indoor Worker Soil Landuse Equation Variable Parameters (Arctic zone)
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIiw-arctic-nc-ing | Indoor Worker Soil Noncarcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw-arctic-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Volatiles (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw-arctic-nc-inh | Indoor Worker Soil Noncarcinogenic Inhalation of Particulates (mg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw-arctic-ca-ing | Indoor Worker Soil Carcinogenic Ingestion (mg/kg-day) | Contaminant-specific | Determined in this calculator |
| CDIiw-arctic-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Volatiles (µg/m3) | Contaminant-specific | Determined in this calculator |
| CDIiw-arctic-ca-inh | Indoor Worker Soil Carcinogenic Inhalation of Particulates (µg/m3) | Contaminant-specific | Determined in this calculator |
| BWiw | Body Weight (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDiw | Exposure Duration (years) | 25 | U.S. EPA 1991a (pg. 15) |
| EFiw | Exposure Frequency (days/year) | 250 | U.S. EPA 1991a (pg. 15) |
| ETiw | Exposure Time (hours/day) | 8 | U.S. EPA 1991a (pg. 10) |
| IRSiw | Soil Ingestion Rate (mg/day) | 50 | U.S. EPA 1991a (pg. 15) |
| ATiw | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
Table 10. Groundwater Equation Parameters
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| CDIwater-nc-ing | Resident Groundwater Noncarcinogenic Ingestion (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-nc-der | Resident Groundwater Noncarcinogenic Dermal (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-nc-inh | Resident Groundwater Noncarcinogenic Inhalation (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-nc-tot | Resident Groundwater Noncarcinogenic Total (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-ing | Recreation Groundwater Carcinogenic Ingestion (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-der | Resident Groundwater Carcinogenic Dermal (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-inh | Resident Groundwater Carcinogenic Inhalation (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-tot | Resident Groundwater Carcinogenic Total (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-mu-ing | Resident Groundwater Mutagenic Ingestion (µg/L) | Mutagen-specific | Determined in this calculator |
| CDIwater-mu-der | Resident Groundwater Mutagenic Dermal (µg/L) | Mutagen-specific | Determined in this calculator |
| CDIwater-mu-inh | Resident Groundwater Mutagenic Inhalation (µg/L) | Mutagen-specific | Determined in this calculator |
| CDIwater-mu-tot | Resident Groundwater Mutagenic Total (µg/L) | Mutagen-specific | Determined in this calculator |
| CDIwater-ca-vc-ing | Resident Groundwater Carcinogenic Vinyl Chloride Ingestion (µg/L) | Vinyl Chloride-specific | Determined in this calculator |
| CDIwater-ca-vc-der | Resident Groundwater Carcinogenic Vinyl Chloride Dermal (µg/L) | Vinyl Chloride-specific | Determined in this calculator |
| CDIwater-ca-vc-inh | Resident Groundwater Carcinogenic Vinyl Chloride Inhalation (µg/L) | Vinyl Chloride-specific | Determined in this calculator |
| CDIwater-ca-vc-tot | Resident Groundwater Carcinogenic Vinyl Chloride Total (µg/L) | Vinyl Chloride-specific | Determined in this calculator |
| CDIwater-ca-tce-ing | Resident Groundwater Carcinogenic Trichloroethylene Ingestion (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-tce-der | Resident Groundwater Carcinogenic Trichloroethylene Dermal (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-tce-inh | Resident Groundwater Carcinogenic Trichloroethylene Inhalation (µg/L) | Contaminant-specific | Determined in this calculator |
| CDIwater-ca-tce-tot | Resident Groundwater Carcinogenic Trichloroethylene Total (µg/L) | Contaminant-specific | Determined in this calculator |
| BWreswa | Body Weight - adult (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BWreswc | Body Weight - child (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW0-2 | Body Weight - 0-2 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW2-6 | Body Weight - 2-6 Years (kg) | 15 | U.S. EPA 1991a (pg. 15) |
| BW6-16 | Body Weight - 6-16 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| BW16-26 | Body Weight - 16-26 Years (kg) | 80 | U.S. EPA 2011, Table 8-3; weighted mean values for adults 21-78 |
| EDresw | Exposure Duration - adult + child (years) | 26 | EPA 2011, Table 16-108; 90th percentile for current residence time. |
| EDreswa | Exposure Duration - adult (years) | 20 | EDr (26 years) - EDc (6 years) |
| EDreswc | Exposure Duration - child (years) | 6 | U.S. EPA 1991a (pg. 15) |
| ED0-2 | Exposure Duration - 0-2 Years (years) | 2 | U.S. EPA 1991a (pg. 15) |
| ED2-6 | Exposure Duration - 2-6 Years (years) | 4 | U.S. EPA 1991a (pg. 15) |
| ED6-16 | Exposure Duration - 6-16 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| ED16-26 | Exposure Duration - 16-26 Years (years) | 10 | U.S. EPA 1991a (pg. 15) |
| EFresw | Exposure Frequency - adult + child (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EFreswa | Exposure Frequency - adult (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EFreswc | Exposure Frequency - child (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EF0-2 | Exposure Frequency - 0-2 Years (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EF2-6 | Exposure Frequency - 2-6 Years (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EF6-16 | Exposure Frequency - 6-16 Years (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| EF16-26 | Exposure Frequency - 16-26 Years (days/year) | 350 | U.S. EPA 1991a (pg. 15) |
| ETresw | Exposure Time (hours/day) | 24 | Maximum hours in a day |
| ETreswc | Exposure Time - child (hours/event) | 0.54 | U.S. EPA 2011, Table 16-28; weighted average of 90th percentile time spent bathing (birth to <6 years) |
| ETreswa | Exposure Time - adult (hours/event) | 0.71 | U.S. EPA 2011, Tables 16-30 and 16-31; weighted average of adult (21 to 78) 90th percentile of time spent bathing/ showering in a day, divided by mean number of baths/showers taken in a day. |
| ET0-2 | Exposure Time (hours/event) | 0.54 | U.S. EPA 2011, Table 16-28; weighted average of 90th percentile time spent bathing (birth to <6 years) |
| ET2-6 | Exposure Time (hours/event) | 0.54 | U.S. EPA 2011, Table 16-28; weighted average of 90th percentile time spent bathing (birth to <6 years) |
| ET6-16 | Exposure Time (hours/event) | 0.71 | U.S. EPA 2011, Tables 16-30 and 16-31; weighted average of adult (21 to 78) 90th percentile of time spent bathing/ showering in a day, divided by mean number of baths/showers taken in a day. |
| ET16-26 | Exposure Time (hours/event) | 0.71 | U.S. EPA 2011, Tables 16-30 and 16-31; weighted average of adult (21 to 78) 90th percentile of time spent bathing/ showering in a day, divided by mean number of baths/showers taken in a day. |
| EVreswc | Events - child (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| EVreswa | Events - adult (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| EV0-2 | Events (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| EV2-6 | Events (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| EV6-16 | Events (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| EV16-26 | Events (events/day) | 1 | U.S. EPA 2004 Exhibit 3-2 |
| IRWreswc | Ingestion Rate - Child (L/day) | 0.78 | U.S. EPA 2011, Tables 3-15 and 3-33; weighted average of 90th percentile consumer-only ingestion of drinking water (birth to <6 years) |
| IRWreswa | Ingestion Rate - Adult (L/day) | 2.5 | U.S. EPA 2011, Table 3-33; 90th percentile of consumer-only ingestion of drinking water (>= 21 years) |
| IRW0-2 | Ingestion Rate - 0-2 years (L/day) | 0.78 | U.S. EPA 2011, Tables 3-15 and 3-33; weighted average of 90th percentile consumer-only ingestion of drinking water (birth to <6 years) |
| IRW2-6 | Ingestion Rate - 2-6 years (L/day) | 0.78 | U.S. EPA 2011, Tables 3-15 and 3-33; weighted average of 90th percentile consumer-only ingestion of drinking water (birth to <6 years) |
| IRW6-16 | Ingestion Rate - 6-16 years (L/day) | 2.5 | U.S. EPA 2011, Table 3-33; 90th percentile of consumer-only ingestion of drinking water (>= 21 years) |
| IRW16-26 | Ingestion Rate - 16-26 years (L/day) | 2.5 | U.S. EPA 2011, Table 3-33; 90th percentile of consumer-only ingestion of drinking water (>= 21 years) |
| IFWres-adj | Ingestion Rate - Age-adjusted (L/kg) | 327.95 | Calculated using the age-adjusted intake factors equation |
| IFWMres-adj | Mutagenic Ingestion Rate - Age-adjusted (L/kg) | 1019.9 | Calculated using the mutagenic age-adjusted intake factors equation |
| SAreswc | Surface area - child (cm2) | 6378 | U.S. EPA 2011, Table 7.10; weighted average of mean values for children <6 years. |
| SAreswa | Surface area - adult (cm2) | 20,900 | U.S. EPA 2011, Table 7.10; weighted average of mean values for adults, male and female 21+. |
| SA0-2 | Surface area 0-2 years (cm2) | 6378 | U.S. EPA 2011, Table 7.10; weighted average of mean values for children <6 years. |
| SA2-6 | Surface area 2-6 years (cm2) | 6378 | U.S. EPA 2011, Table 7.10; weighted average of mean values for children <6 years. |
| SA6-16 | Surface area 6-16 years (cm2) | 20,900 | U.S. EPA 2011, Table 7.10; weighted average of mean values for adults, male and female 21+. |
| SA16-26 | Surface area 16-26 (cm2) | 20,900 | U.S. EPA 2011, Table 7.10; weighted average of mean values for adults, male and female 21+. |
| ATresw | Averaging time (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| DFWres-adj | Dermal contact factor- age-adjusted (L/kg) | 2,721,670 | Calculated using the age-adjusted intake factors equation |
| DFWMres-adj | Mutagenic dermal contact factor- age-adjusted (L/kg) | 8,419,740 | Calculated using the mutagenic age-adjusted intake factors equation |
| DAevent | Absorbed dose per event (µg/cm2-event) | Chemical-specific | U.S. EPA 2004 |
| FA | Fraction absorbed (unitless) | Chemical-specific | U.S. EPA 2004 |
| B | Dimensionless ratio of the permeability coefficient of a compound through the stratum corneum relative to its permeability coefficient across the viable epidermis (ve) (dimensionless).(unitless) | Chemical-specific | U.S. EPA 2004 |
| t* | Time to reach steady-state (hr) | = 2.4 τevent Chemical-specific |
U.S. EPA 2004 |
| τevent | Lag time per event (hr/event) | Chemical-specific | U.S. EPA 2004 |
| Kp | Dermal permeability coefficient of compound in water (cm/hr) | Chemical-specific | U.S. EPA 2004 |
Table 11. Particulate Emission Factor Equation Variables
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| PEFw<40" | Particulate Emission Factor - Under 40" precipitation zone (m3/kg) | 1.36 × 109 | Determined in this calculator |
| PEFw>40" | Particulate Emission Factor -Over 40" precipitation zone (m3/kg) | 5.71 × 109 | Determined in this calculator |
| PEFw-arctic | Particulate Emission Factor -Arctic zone (m3/kg) | 2.70 × 108 | Determined in this calculator |
| Q/C | Inverse of the Mean Concentration at the Center of a 0.5-Acre-Square Source (g/m2-s per kg/m3) | 93.77 <40" 81.71 >40" 101.8877 arctic zone |
Determined in this calculator |
| V | Fraction of Vegetative Cover (unitless) | 0.5 | U.S. EPA 1996a (pg. 23) |
| Um | Mean Annual Wind Speed (m/s) | 4.69 <40" 4.07 >40" 5.77 arctic zone |
U.S. EPA 1996a (pg. 23) |
| Ut | Equivalent Threshold Value of Wind Speed at 7m (m/s) | 11.32 | U.S. EPA 1996a (pg. 23) |
| F(x) | Function Dependent on Um /Ut(unitless) | 0.194 <40" 0.0616 >40" 0.57 arctic zone |
U.S. EPA 1996a (pg. 23) |
| A | Dispersion constant unitless | 16.2302 <40" 14.2253 >40" 17.6482 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) |
| As | Areal extent of the site or contamination (acres) | 0.5 (range 0.5 to 500 ) | U.S. EPA 2002 (pg. D-2) |
| B | Dispersion constant unitless | 18.7762 <40" 18.8366 >40" 18.8138 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) |
| C | Dispersion constant unitless | 216.108 <40" 218.1845 >40" 217.039 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) |
Table 12. Chronic Volatilization Factor Variables
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| VFs<40" | Volatilization Factor - Under than 40" precipitation zone (m3/kg) | Contaminant-specific | U.S. EPA. 2002 Equation 4-8 |
| VFs>40" | Volatilization Factor - Over than 40" precipitation zone (m3/kg) | Contaminant-specific | U.S. EPA. 2002 Equation 4-8 |
| VFs-arctic | Volatilization Factor - Arctic zone (m3/kg) | Contaminant-specific | U.S. EPA. 2002 Equation 4-8 |
| Q/C | Inverse of the Mean Concentration at the Center of a 0.5-Acre-Square Source (g/m2-s per kg/m3) | 93.77 <40" 81.71 >40" 101.8877 arctic zone |
Determined in this calculator |
| A | Dispersion constant unitless | 16.2302 <40" 14.2253 >40" 17.6482 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) |
| As | Areal extent of the site or contamination (acres) | 0.5 (range 0.5 to 500 ) | U.S. EPA 2002 (pg. D-2) |
| B | Dispersion constant unitless | 18.7762 <40" 18.8366 >40" 18.8138 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) |
| C | Dispersion constant unitless | 216.108 <40" 218.1845 >40" 217.039 arctic zone |
U.S. EPA 2002 (pg. D-6 to D-8) | DA | Apparent Diffusivity (cm2/s) | Contaminant-specific | U.S. EPA. 2002 Equation 4-8 |
| T | Exposure interval (s) | 8.2×108 (used for unlimited source model) | U.S. EPA. 2002 Equation 4-8 |
| ρb | Dry soil bulk density (g/cm3) | 1.5 | U.S. EPA. 2002 Equation 4-8 |
| θa | Air-filled soil porosity (Lair/Lsoil) (n-θw) | 0.28 | U.S. EPA. 2002 Equation 4-8 |
| n | Total soil porosity ( Lpore/Lsoil) (1-(ρb/ρs) | 0.43 | U.S. EPA. 2002 Equation 4-8 |
| θw | Water-filled soil porosity (Lwater/Lsoil) | 0.15 | U.S. EPA. 2002 Equation 4-8 |
| ρs | Soil particle density (g/cm3) | 2.65 | U.S. EPA. 2002 Equation 4-8 |
| S | Water Solubility Limit (mg/L) | Contaminant-specific | EPI Suite |
| Dia | Diffusivity in air (cm2/s) | Contaminant-specific | U.S. EPA. 2001 |
| H' | Dimensionless Henry's Law Constant | Contaminant-specific | EPI Suite |
| Diw | Diffusivity in water (cm2/s) | Contaminant-specific | U.S. EPA. 2001 |
| Kd | Soil-water partition coefficient (L/Kg) (Koc×foc) | Contaminant-specific | U.S. EPA. 2002 Equation 4-8 |
| Koc | Soil organic carbon-water partition coefficient (L/Kg) | Contaminant-specific | EPI Suite |
| foc | Organic carbon content of soil (g/g) | 0.001 | DEC |
Table 13. Groundwater Equation Supporting Variables
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
| Kp,ve | Steady-state permeability coefficient through the viable epidermis (ve) (cm/hr) | Kp,ve = KewDe/Le | U.S. EPA 2004 |
| MW | Molecular weight (g/mole) | Chemical-specific | U.S. EPA 2004 |
| Kew | Equilibrium partition coefficient between the epidermis and water for the absorbing chemical (dimensionless) | 1, assuming EPI behaves essentially as water | U.S. EPA 2004 |
| De | Effective diffusivity of the absorbing chemical in the epidermis (cm2/hr) | De =7.1x10-6/MW cm2/s assuming De=10-6 cm2/s when MW = 50 | U.S. EPA 2004 |
| Le | Effective thickness of the epidermis (cm) | 10-2 | U.S. EPA 2004 |
| lsc | Apparent thickness of stratum corneum (cm) | 10-3 | U.S. EPA 2004 |
| Dsc | Effective diffusion coefficient for chemical transfer through the stratum corneum (cm2/hr) | Chemical-specific | U.S. EPA 2004 |
| b | Correlation coefficients which have been fitted to the Flynn's data | Chemical-specific | U.S. EPA 2004 |
| c | Correlation coefficients which have been fitted to the Flynn's data | Chemical-specific | U.S. EPA 2004 |
Table 14. Toxicity and Miscellaneous Variable Descriptions Used in CL Equations
| Symbol | Definition (units) | Default | Reference |
|---|---|---|---|
Toxicity Values |
|||
| RfDo | Chronic Oral Reference Dose (mg/kg-day) | Contaminant-specific | DEC hierarchy |
| RfC | Chronic Inhalation Reference Concentration (mg/m3) | Contaminant-specific | DEC hierarchy |
| CSFo | Chronic oral Slope Factor (mg/kg-day)-1 | Contaminant-specific | DEC hierarchy |
| IUR | Chronic Inhalation Unit Risk (µg/m3)-1 | Contaminant-specific | DEC hierarchy |
Miscellaneous Variables |
|||
| TR | target risk | 1 × 10-5 | Determined in this calculator |
| THQ | target hazard quotient | 1 | Determined in this calculator |
| K | Andelman Volatilization Factor (L/m3) | 0.5 | U.S. EPA 1991b (pg. 20) |
| Kp | Dermal Permeability Constant (cm/hr) | Contaminant-specific | U.S. EPA 2004 |
| ATr | Averaging time - resident (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| ATw | Averaging time - composite worker (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| ATiw | Averaging time - indoor worker (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| ATow | Averaging time - outdoor worker (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| ATcw | Averaging time - construction worker (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| ATrec | Averaging time - recreator (days/year) | 365 | U.S. EPA 1989 (pg. 6-23) |
| LT | Lifetime (years) | 70 | U.S. EPA 1989 (pg. 6-22) |
Table 15. References for Toxicity and Miscellaneous Variable Descriptions Used in CL Equations
| Abbreviation | Full Reference |
|---|---|
| Ref 1 | Full citations to be added once the regulation is written. |