R 299.20 Generic cleanup criteria for soil based on direct contact.

Rule 20. (1) Cleanup criteria for soil based on direct contact shall be calculated for the generic residential category according to the following algorithms, except as provided in R 299.34(3): EQUATION FOR CARCINOGENS: )] AE DF (EF ) AE IF [(EF SF CF AT TR DCC d d i i          where, DCC (Direct contact criterion) = chemical-specific, ug/kg or ppb TR (Target risk level) = 10-5 AT (Averaging time) = 25,550 days (70 years x 365 days/year) CF (Conversion factor) = 1E+9 ug/kg SF (Oral cancer slope factor) = chemical-specific (mg/kg-day)- 1 EFi (Ingestion exposure frequency) = 350 days/year IF (Age-adjusted soil ingestion factor) = 114 mg-year/kg-day* AEi (Ingestion absorption efficiency) = chemical-specific or default specified at R 299.20(3) EFd (Dermal exposure frequency) = 245 days/year DF (Age-adjusted soil dermal factor) = 353 mg-year/kg-day** AEd (Dermal absorption efficiency) = chemical-specific or default specified at R 299.20(3) EQUATIONS FOR NONCARCINOGENS: )] AE DF EF ( ) AE IF [(EF RSC CF AT RfD THQ DCC d d i i           where, DCC (Direct contact criterion) = chemical-specific (ug/kg or ppb) THQ (Target hazard quotient) = 1 RfD (Oral reference dose) = chemical-specific mg/kg-/day AT (Averaging time) = 10,950 days (30 years x 365 days/year) CF (Conversion factor) = 1E+9 ug/kg RSC (Relative source contribution) = 1 EFi (Ingestion exposure frequency) = 350 days/year IF (Age-adjusted soil ingestion factor) = 114 mg-year/kg-day* AEi (Ingestion absorption efficiency) = chemical-specific or default specified at R 299.20(3) EFd (Dermal exposure frequency) = 245 days/year DF (Age-adjusted soil dermal factor) = 353 mg-year/kg-day** AEd (Dermal absorption efficiency) = chemical-specific or default specified at R 299.20(3) and,                    adult adult adult 6 1 age 6 1 age 6 1 age BW ED IR BW ED IR IF * where, IRsoil/age 1-6 (Soil ingestion rate) = 200 mg/day EDage 1-6 (Exposure duration) = 6 years BWage 1-6 (Body weight) = 15 kg IRadult (Soil ingestion rate) = 100 mg/day EDadult (Exposure duration) = 24 years BWadult (Body weight) = 70 kg and, **                         adult adult adult adult 6 1 age 6 1 age 6 1 age 6 1 age BW ED AF EV SA BW ED AF EV SA DF where, SAage 1-6 (Skin surface area) = 2,670 cm2/dayevent EV (Event frequency) = 1 event/day AFage 1-6 (Soil adherence factor) = 0.2 mg/cm2 EDage 1-6 (Exposure duration) = 6 years BWage 1-6 (Body weight) = 15 kg SAadult (Skin surface area) = 5,800 cm2/dayevent AFadult (Soil adherence factor) = 0.07 mg/cm2 EDadult (Exposure duration) = 24 years BWadult (Body weight) = 70 kg (2) Cleanup criteria for soil based on direct contact shall be calculated for the generic nonresidential category according to the following algorithms, except as provided in R 299.34(3): EQUATION FOR CARCINOGENS: )] AE AF EV SA (EF ) AE IR [(EF ED SF CF AT BW TR DCC d d i s i              where, DCC (Direct contact criterion) = chemical-specific, ug/kg or ppb TR (Target risk level) = 10-5 BW (Body weight) = 70 kg AT (Averaging time) = 25,550 days (70 years x 365 days/year) CF (Conversion factor) = 1E+9 ug/kg SF (Oral cancer slope factor) = chemical-specific (mg/kg-day)-1 ED (Exposure duration) = 21 years EFi (Ingestion exposure frequency) = 245 days/year IRs (Soil ingestion rate) = 100 mg/day (residential) AEi (Ingestion absorption efficiency) = chemical-specific or default specified at R 299.20(3) EFd (Dermal exposure frequency) = 160 days/year SA (Skin surface area) = 3,300 cm2/day event EV (Event frequency) = 1 event/day AF (Soil adherence factor) = 0.2 mg/cm2 (nonresidential) AEd (Dermal absorption efficiency) = chemical-specific or default specified at R 299.20(3) EQUATION FOR NONCARCINOGENS: )] AE AF EV SA (EF ) AE IR [(EF ED RSC CF AT BW RfD THQ DCC d d i s i               where, DCC (Direct contact criterion) = chemical-specific, ug/kg or ppb THQ (Target hazard quotient) = 1 RfD (Oral reference dose) = chemical-specific, mg/kg-/day BW (Body weight) = 70 kg AT (Averaging time) = 7,665 days (21 years x 365 days/year) CF (Conversion factor) = 1E+9 ug/kg RSC (Relative source contribution) = 1 ED (Exposure duration) = 21 years EFi (Ingestion exposure frequency) = 245 days/year IRs (Soil ingestion rate) = 100 mg/day AEi (Ingestion absorption efficiency) = chemical-specific or default specified at R 299.20(3) EFd (Dermal exposure frequency) = 160 days/year SA (Skin surface area) = 3,300 cm2/day event EV (Event frequency) = 1 event/day AF (Soil adherence factor) = 0.2 mg/cm2 (nonresidential) AEd (Dermal absorption efficiency) = chemical-specific or default specified at R 299.20(3) (3) Absorption efficiencies used to calculate generic direct contact criteria are as follows: (a) Chemical-specific data may be submitted to the department to support development of a new generic criterion under R 299.6(9) or (10) and shall be used in this rule if determined by the department to be the best available information. (b) If chemical-specific data are not available, then the following default absorption efficiencies shall be used: (i) AEi shall be 50% for organic hazardous substances which exhibit a log octanol water partitioning coefficient greater than 5 and a molecular weight greater than 200 grams per mole or which are not ionizing organic compounds, and 100% for all other organic hazardous substances. (ii) AEi shall be 50% for inorganic hazardous substances. (iii) AEd shall be assumed to be 10% for organic hazardous substances. (iv) AEd shall be assumed to be 1% for inorganic hazardous substances. (4) To demonstrate compliance with generic direct contact criteria, the criteria shall be applied without regard to the depth of contaminated soil.