Risk-Based Corrective Action (RBCA)
By: Mike Trombetta Department of Environmental Quality AGENDA
• Petroleum Release Risks
• Non-DEQ-7 Chemicals
• Recen t RBCA U pd at es Water Table Surface Spill
Water Table Surface Spill
Water Table Surface Spill
Water Table Surface Spill
Water Table Leaching to Groundwater
Water Table Leaching to Groundwater
Water Table Leaching to Groundwater
Water Table Leaching to Groundwater
Water Table Leaching to Groundwater
Water Table
Groundwater Flow Leaching to Groundwater
Water Table
Groundwater Flow Leaching to Groundwater
Water Table
Groundwater Flow Leaching to Groundwater
DiDrin king Water Well
Water Table
Groundwater Flow Leaching to Groundwater
DiDrin king Water Well
Water Table
Groundwater Flow Leaching to Groundwater
DiDrin king Water Well
Water Table
Groundwater Flow Point of Compliance DEQ-7
Water Table
Groundwater Flow Montana’s Water Quality Standards Soil Leaching ViblVariables: Precipitation Soil porosity Dispersivity Fraction organic carbon Decay coefficient Source area size (L-W-T)
54 total parameters
Water Table
Groundwater Flow Other Risks from Petroleum Releases Direct Contact
Commercial Setting Employee Direct Contact
Residential, Customer, Recreator, or Trespasser Direct Contact
Water Table Construction Worker Direct Contact
Water Table Construction Worker Direct Contact
Water Table Construction Worker Direct Contact
Water Table Construction Worker Indoor Air Vapors IdIndoor Ai AiVr Vapors Chemistry of Petroleum Products
Gasoline Example Gasoline –Over 140 Chemicals
2-methylpropane Isobutane Lighter 1-Butene 2-Methyl-2-butene n-Butane Isopentane Pentene 2-Pentene dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane 2-Methyl-1-pentene n-Hexane unknown 4-Methyl-2-pentene 2,4-Dimethylpentane unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 232,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane unknown Dimethylundecane unknown 2,2,3,1,4-tetramethylpentane p-Xylene unknown m-Xylene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene unknown 3,4,4-Trimethyl-2-hexene unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene unknown Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene unknown Cymene 3-n-Propyl-toluene unknown 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene unknown 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene Diethylbenzene unknown 1,3,5-TriMe-benzene 1,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene unknown 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan unknown Dimethylnaphthalene unknown Heavier 2-Methylnapthelene Gasoline –Over 140 Chemicals
2-methylpropane Isobutane Lighter 1-Butene 2-Methyl-2-butene n-Butane Isopentane Pentene 2-Pentene dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane 2-Methyl-1-pentene n-Hexane unknown 4-Methyl-2-pentene 2,4-Dimethylpentane unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown 2-Methyl-1-pentene Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 232,3-Dimethylhexane n-Hexane 2,3-Dimethylhexane Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown 4-Methyl-2-pentene Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane 2,4-Dimethylpentane unknown Dimethylundecane unknown 2,2,3,1,4-tetramethylpentane p-Xylene unknown m-Xylene 4-Methylpentene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene unknown 3,4,4-Trimethyl-2-hexene Methylcyclopentane unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene Methyl-tertiarybutyl-ether (MTBE) 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene unknown 2,2-Dimethylpentane Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene Benzene unknown Cymene 3-n-Propyl-toluene unknown 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene unknown 2-Methylhexane 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene Diethylbenzene unknown 1,3,5-TriMe-benzene 1,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene unknown 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan unknown Dimethylnaphthalene unknown Heavier 2-Methylnapthelene Gasoline –Over 140 Chemicals C-5 2-methylpropane Isobutane Lighter 1-Butene 2-Methyl-2-butene n-Butane Isopentane Pentene C 2-Pentene C dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane CC 2-Methyl-1-pentene n-Hexane unknown 4-Methyl-2-pentene 2,4-Dimethylpentane C unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 232,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane unknown Dimethylundecane unknown 2,2,3,1,4-tetramethylpentane p-Xylene unknown m-Xylene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene unknown 3,4,4-Trimethyl-2-hexene unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene C unknown C Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene CC 1-Methyl-2-n-propylbenzene C unknown Cymene 3-n-Propyl-toluene unknown CC 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene C unknown 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene C Diethylbenzene C unknown 1,3,5-TriMe-benzene 1,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene unknown C C 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan unknown Dimethylnaphthalene unknown Heavier 2-Methylnapthelene C-12 Gasoline –Over 140 Chemicals C-5 2-methylpropane Isobutane Lighter 1-Butene 2-Methyl-2-butene n-Butane Isopentane Pentene C 2-Pentene C dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane 2-Methyl-1-pentene CC n-Hexane Technical unknown 4-Methyl-2-pentene 2,4-Dimethylpentane C unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Cha llenge ! Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 232,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane unknown Dimethylundecane unknown DEQ – 7 Standards 2,2,3,1,4-tetramethylpentane p-Xylene unknown m-Xylene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene unknown (On ly 8 Ch em ica ls) 3,4,4-Trimethyl-2-hexene unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene C unknown C Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene CC 1-Methyl-2-n-propylbenzene C unknown Cymene 3-n-Propyl-toluene unknown CC 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene C unknown 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene C Diethylbenzene C unknown 1,3,5-TriMe-benzene 1,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene unknown C C 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan unknown Dimethylnaphthalene unknown Heavier 2-Methylnapthelene C-12 Gasoline –Over 140 Chemicals
C-5 2-methylpropane Isobutane 1-Butene 2-Methyl-2-butene n-Butane Isopentane Lighter Pentene 2-Pentene dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane 2-Methyl-1-pentene n-Hexane unknown 4-Methyl-2-pentene 2,4-Dimethylpentane unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 2,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane unknown Dimethylundecane unknown 2,2,3,1,4-tetramethylpentane p-Xylene unknown m-Xylene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene unknown 3,4,4-Trimethyl-2-hexene unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene unknown Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene unknown Cymene 3-n-Propyl-toluene unknown 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene unknown 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene Diethylbenzene unknown 1,3,5-TriMe-benzene 1241,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene unknown 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan Heavier unknown Dimethylnaphthalene unknown C-12 2-Methylnapthelene Gasoline –Over 140 Chemicals
C-5 2-methylpropane Isobutane 1-Butene 2-Methyl-2-butene n-Butane Isopentane Lighter Pentene Target 2-Pentene dimethylcyolopropane 2,3-Dimethylbutane Cyclopentene unknown 3-Methylpentane Analytes 2-Methyl-1-pentene n-Hexane unknown 4-Methyl-2-pentene 2,4-Dimethylpentane unknown 4-Methylpentene Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane Benzene Benzene 2-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane Trimethylpentane Dirnethylhexane unknown 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,3,4Trimethylpentane 2,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Ethylbenzene Methylcyolohexane unknown 1-trans-2-cis-4-trimethylcyolopentane unknown Toluene Toluene 2-Methyl-3-ethylpentane unknown 1,2-Dimethylcyclohexane unknown 2,3,3-trimethyihexane 1,3-dimethylcyclohexane unknown Dimethylundecane unknown 2,2,3,1,4-tetramethylpentane p-Xylene p-Xylene unknown m-Xylene m-Xylene 1,2-Dibromoethane (EDB) 3,3-Dimethylheptane Trimethvlpentane o-Xylene o-Xylene unknown 3,4,4-Trimethyl-2-hexene unknown n-Nonane Cumene 1-Methyl-3-ethylbenzene 3-Methylnonane n-Propylbenzene o-Ethyltoluene 1-Methyl-4-ethylbenzene 1,2,4-Trimethylbenzene unknown 1,3,5-Trimethylbenzene 3-Methylnonane Cumene unknown Trimethylbenzene o-Methylstyrene 4-Methyldecane unknown 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene unknown Cymene 3-n-Propyl-toluene unknown 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene unknown 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene unknown 2,6-Dirnethyistyrene Diethylbenzene unknown 1,3,5-TriMe-benzene 1241,2,4-TriMe-benzene 1,2,3-TriMe-benzene Napthalene Napthalene unknown 1,6-Dimethyllindan 2-Methylnaphthalene 1-Methylnaphthalene n-Dodecane unknown 1,1-Dimethylindan Heavier unknown Dimethylnaphthalene unknown C-12 2-Methylnapthelene Gasoline –Over 140 Chemicals
C-5 2-methylpropane 2-methylpropane Isobutane Isobutane 1-Butene 1-Butene 2-Methyl-2-butene 2-Methyl-2-butene n-Butane n-Butane Isopentane Isopentane Lighter Pentene Target Pentene 2-Pentene 2-Pentene dimethylcyolopropane dimethylcyolopropane 2,3-Dimethylbutane 2,3-Dimethylbutane Cyclopentene Cyclopentene unknown unknown C9-C12 3-Methylpentane Analytes 3-Methylpentane 2-Methyl-1-pentene 2-Methyl-1-pentene n-Hexane n-Hexane unknown unknown 4-Methyl-2-pentene 4-Methyl-2-pentene 2,4-Dimethylpentane 2,4-Dimethylpentane Aliphatics unknown unknown 4-Methylpentene 4-Methylpentene Methylcyclopentane Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) Methyl-tertiary-bytylEther (MTBE) Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane 2,2-Dimethylpentane Benzene Benzene Benzene 2-Methylhexane 2-Methylhexane 3-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane 2,2,4-Trimethylpentane Trimethylpentane Trimethylpentane Dirnethylhexane Dirnethylhexane unknown unknown 2,3,3-Trimethylpentane 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene 1,4-Methylhexene Heptane 2,5-Dimethylhexane Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,4-Dimethylhexane C9-C10 2,3,4Trimethylpentane 2,3,4Trimethylpentane 2,3-Dimethylhexane 2,3-Dimethylhexane 2,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Ethylbenzene Ethylbenzene Methylcyolohexane Methylcyolohexane unknown unknown Aromatics 1-trans-2-cis-4-trimethylcyolopentane 1-trans-2-cis-4-trimethylcyolopentane unknown unknown Toluene Toluene Toluene 2-Methyl-3-ethylpentane 2-Methyl-3-ethylpentane unknown unknown 1,2-Dimethylcyclohexane 1,2-Dimethylcyclohexane unknown unknown 2,3,3-trimethyihexane 2,3,3-trimethyihexane 1,3-dimethylcyclohexane 1,3-dimethylcyclohexane unknown unknown Dimethylundecane Dimethylundecane unknown unknown 2,2,3,1,4-tetramethylpentane C5-C8 2,2,3,1,4-tetramethylpentane p-Xylene p-Xylene unknown p-Xylene m-Xylene m-Xylene unknown 1,2-Dibromoethane (EDB) m-Xylene 3,3-Dimethylheptane 1,2-Dibromoethane (EDB) Trimethvlpentane 3,3-Dimethylheptane Aliphatics Trimethvlpentane o-Xylene o-Xylene unknown o-Xylene 3,4,4-Trimethyl-2-hexene unknown unknown 3,4,4-Trimethyl-2-hexene n-Nonane unknown Cumene Cumene n-Nonane 1-Methyl-3-ethylbenzene 1-Methyl-3-ethylbenzene Cumene 3-Methylnonane 3-Methylnonane 1-Methyl-3-ethylbenzene n-Propylbenzene n-Propylbenzene 3-Methylnonane o-Ethyltoluene o-Ethyltoluene n-Propylbenzene 1-Methyl-4-ethylbenzene 1-Methyl-4-ethylbenzene o-Ethyltoluene 1,2,4-Trimethylbenzene 1,2,4-Trimethylbenzene 1-Methyl-4-ethylbenzene unknown unknown 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 1,3,5-Trimethylbenzene unknown 3-Methylnonane 3-Methylnonane 1,3,5-Trimethylbenzene Cumene 3-Methylnonane Cumene unknown unknown Cumene unknown Trimethylbenzene Trimethylbenzene Trimethylbenzene o-Methylstyrene o-Methylstyrene o-Methylstyrene 4-Methyldecane 4-Methyldecane 4-Methyldecane unknown unknown unknown 1,4-Diethylbenzene 1,4-Diethylbenzene 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene 1-Methyl-2-n-propylbenzene 1-Methyl-2-n-propylbenzene unknown unknown unknown Cymene Cymene Cymene 3-n-Propyl-toluene 3-n-Propyl-toluene 3-n-Propyl-toluene unknown unknown unknown 4-Methyldecane 4-Methyldecane 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene 1,4-Dimethyl-2-ethylbenzene 1,4-Dimethyl-2-ethylbenzene unknown unknown unknown 5-Ethyl-methylxylene 5-Ethyl-methylxylene 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene 1,4-Dimethy-2-ethylbenzene 1,4-Dimethy-2-ethylbenzene unknown unknown unknown 2,6-Dirnethyistyrene 2,6-Dirnethyistyrene 2,6-Dirnethyistyrene Diethylbenzene Diethylbenzene Diethylbenzene unknown unknown unknown 1,3,5-TriMe-benzene 1,3,5-TriMe-benzene ,5-TriMe-benzene 1241,2,4-TriMe-benzene 1241,2,4-TriMe-benzene 1351,3 1,2,3-TriMe-benzene 1,2,3-TriMe-benzene 1,2,4-TriMe-benzene Napthalene Napthalene Napthalene 1,2,3-TriMe-benzene unknown unknown Napthalene 1,6-Dimethyllindan 1,6-Dimethyllindan unknown 2-Methylnaphthalene 2-Methylnaphthalene 1,6-Dimethyllindan 1-Methylnaphthalene 1-Methylnaphthalene 2-Methylnaphthalene n-Dodecane n-Dodecane 1-Methylnaphthalene unknown unknown n-Dodecane 1,1-Dimethylindan 1,1-Dimethylindan unknown unknown unknown 1,1-Dimethylindan Heavier unknown Dimethylnaphthalene Dimethylnaphthalene unknown unknown Dimethylnaphthalene 2-Methylnapthelene 2-Methylnapthelene unknown C-12 2-Methylnapthelene Gasoline –Over 140 Chemicals
C-5 2-methylpropane 2-methylpropane Isobutane Isobutane 1-Butene 1-Butene 2-Methyl-2-butene 2-Methyl-2-butene n-Butane n-Butane “Fractions” Isopentane Isopentane Lighter Pentene Target Pentene 2-Pentene 2-Pentene dimethylcyolopropane dimethylcyolopropane 2,3-Dimethylbutane 2,3-Dimethylbutane Cyclopentene Cyclopentene unknown unknown C9-C12 3-Methylpentane Analytes 3-Methylpentane 2-Methyl-1-pentene 2-Methyl-1-pentene n-Hexane n-Hexane unknown unknown 4-Methyl-2-pentene 4-Methyl-2-pentene 2,4-Dimethylpentane 2,4-Dimethylpentane Aliphatics unknown unknown 4-Methylpentene 4-Methylpentene Methylcyclopentane Methylcyclopentane Methyl-tertiary-bytylEther (MTBE) Methyl-tertiary-bytylEther (MTBE) Methyl-tertiary-bytylEther (MTBE) 2,2-Dimethylpentane 2,2-Dimethylpentane Benzene Benzene Benzene 2-Methylhexane 2-Methylhexane 3-Methylhexane 3-Methylhexane 2,2,4-Trimethylpentane 2,2,4-Trimethylpentane Trimethylpentane Trimethylpentane Dirnethylhexane Dirnethylhexane unknown unknown 2,3,3-Trimethylpentane 2,3,3-Trimethylpentane 1,1,3-Trimethylcyclopentane 1,1,3-Trimethylcyclopentane 1-trans-2-cis-3-Trimethylcyclopentane unknown Nonanol 1,4-Methylhexene 1,4-Methylhexene Heptane 2,5-Dimethylhexane Heptane 2,5-Dimethylhexane 2,4-Dimethylhexane 2,4-Dimethylhexane C9-C10 2,3,4Trimethylpentane 2,3,4Trimethylpentane 2,3-Dimethylhexane 2,3-Dimethylhexane 2,3-Dimethylhexane 2,3-Dimethylhexane Ethylbenzene Ethylbenzene Ethylbenzene Methylcyolohexane Methylcyolohexane unknown unknown Aromatics 1-trans-2-cis-4-trimethylcyolopentane 1-trans-2-cis-4-trimethylcyolopentane unknown unknown Toluene Toluene Toluene 2-Methyl-3-ethylpentane 2-Methyl-3-ethylpentane unknown unknown 1,2-Dimethylcyclohexane 1,2-Dimethylcyclohexane unknown unknown 2,3,3-trimethyihexane 2,3,3-trimethyihexane 1,3-dimethylcyclohexane 1,3-dimethylcyclohexane unknown unknown Dimethylundecane Dimethylundecane unknown unknown 2,2,3,1,4-tetramethylpentane C5-C8 2,2,3,1,4-tetramethylpentane p-Xylene p-Xylene unknown p-Xylene m-Xylene m-Xylene unknown 1,2-Dibromoethane (EDB) m-Xylene 3,3-Dimethylheptane 1,2-Dibromoethane (EDB) Trimethvlpentane 3,3-Dimethylheptane Aliphatics Trimethvlpentane o-Xylene o-Xylene unknown o-Xylene 3,4,4-Trimethyl-2-hexene unknown unknown 3,4,4-Trimethyl-2-hexene n-Nonane unknown Cumene Cumene n-Nonane 1-Methyl-3-ethylbenzene 1-Methyl-3-ethylbenzene Cumene 3-Methylnonane 3-Methylnonane 1-Methyl-3-ethylbenzene n-Propylbenzene n-Propylbenzene 3-Methylnonane o-Ethyltoluene o-Ethyltoluene n-Propylbenzene 1-Methyl-4-ethylbenzene 1-Methyl-4-ethylbenzene o-Ethyltoluene 1,2,4-Trimethylbenzene 1,2,4-Trimethylbenzene 1-Methyl-4-ethylbenzene unknown unknown 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 1,3,5-Trimethylbenzene unknown 3-Methylnonane 3-Methylnonane 1,3,5-Trimethylbenzene Cumene 3-Methylnonane Cumene unknown unknown Cumene unknown Trimethylbenzene Trimethylbenzene Trimethylbenzene o-Methylstyrene o-Methylstyrene o-Methylstyrene 4-Methyldecane 4-Methyldecane 4-Methyldecane unknown unknown unknown 1,4-Diethylbenzene 1,4-Diethylbenzene 1,4-Diethylbenzene 1-Methyl-2-n-propylbenzene 1-Methyl-2-n-propylbenzene 1-Methyl-2-n-propylbenzene unknown unknown unknown Cymene Cymene Cymene 3-n-Propyl-toluene 3-n-Propyl-toluene 3-n-Propyl-toluene unknown unknown unknown 4-Methyldecane 4-Methyldecane 4-Methyldecane 1,4-Dimethyl-2-ethylbenzene 1,4-Dimethyl-2-ethylbenzene 1,4-Dimethyl-2-ethylbenzene unknown unknown unknown 5-Ethyl-methylxylene 5-Ethyl-methylxylene 5-Ethyl-methylxylene 1,4-Dimethy-2-ethylbenzene 1,4-Dimethy-2-ethylbenzene 1,4-Dimethy-2-ethylbenzene unknown unknown unknown 2,6-Dirnethyistyrene 2,6-Dirnethyistyrene 2,6-Dirnethyistyrene Diethylbenzene Diethylbenzene Diethylbenzene unknown unknown unknown 1,3,5-TriMe-benzene 1,3,5-TriMe-benzene ,5-TriMe-benzene 1241,2,4-TriMe-benzene 1241,2,4-TriMe-benzene 1351,3 1,2,3-TriMe-benzene 1,2,3-TriMe-benzene 1,2,4-TriMe-benzene Napthalene Napthalene Napthalene 1,2,3-TriMe-benzene unknown unknown Napthalene 1,6-Dimethyllindan 1,6-Dimethyllindan unknown 2-Methylnaphthalene 2-Methylnaphthalene 1,6-Dimethyllindan 1-Methylnaphthalene 1-Methylnaphthalene 2-Methylnaphthalene n-Dodecane n-Dodecane 1-Methylnaphthalene unknown unknown n-Dodecane 1,1-Dimethylindan 1,1-Dimethylindan unknown unknown unknown 1,1-Dimethylindan Heavier unknown Dimethylnaphthalene Dimethylnaphthalene unknown unknown Dimethylnaphthalene 2-Methylnapthelene 2-Methylnapthelene unknown C-12 2-Methylnapthelene Gasoline –Over 140 Chemicals
Groundwater Standard or Chemical Effect Basis RBSL (µg/l) MTBE n hhs 30 Benzene c hhs 5 Toluene n hhs 1,000 Ethylbenzene n hhs 700 Xylenes (total) n hhs 10,000 Naphthalene n hhs 100 C5-C8 Aliphatics n rb 700 C9-C12 Aliphatics n rb 1,000 C9-C10 Aromatics n rb 1,000 TPH ce iling for gaso line an d bu 1,000 light hydrocarbons Diesel – Hundreds of Chemicals
Groundwater Standard or RBSL Chemical Effect Basis (µg/l) Acenaphthene n hhs 670 Anthracene n hhs 2,100 Anthracene n hhs 0.5 Benzo(a)pyrene c hhs 0.05 Benzo(b)fluoranthene c hhs 0.5 Benzo(k)fluoranthene c hhs 5 Chrysene c hhs 50 Dibenzo (a, h)an thracene c hhs 0050.05 Fluoranthene n hhs 130 Fluorene n hhs 1,100 Indeno(1, 2, 3-cd)pyrene c hhs 050.5 Naphthalene n hhs 100 Pyrene n hhs 830 C9-C18 Aliphatics n rb 1,000 C19-C36 Aliphatics n bu 1,000 C11-C21 Aromatics n rb 1,000 TPH ceiling for diesel and heavier hydrocarbons bu 1,000 RBCA Look-Up Tables Surface Soil Sub-surface Soil (<2 ft) Groundwater ((2>2 ft) 3 different 3 different depths to depths to water water Residential & Commercial ARM 17. 56. 506(1)(b) REPORTING RELEASES When a release is confirmed from laboratoryyy analysis of samp les collected from a site …exceed the following values…: (i) RBSLs (ii) USEPA RSLs (iii) Background in water ARM 17.56.607(4)(b) RELEASE CLOSURE TToo categocategorizerize a releaserelease as resolved,resolved, O/O may use either of the following methods to evaluate risks from a release:
(i) RBCA
(ii) a site-specific risk assessment method approvedbd by th e d epart ment tf for eval uati on of risks to human health, safety and the environment. 2009 RBCA Changes from 2007 Basis for Change
• Updated Chemical Toxicity Data • Updated Particulate Emission Factors • Updated Volatilization Factors • Updated Dermal Exposure Calculations • Updated Dermal Adherence Factors • Added Inhalation Exposure for PAHs • Changed Beneficial Use Criteria Groundwater
Contaminant of Concern RBCA Screening Level (µg/l) Old (2007) New (2009)
TPH ceiling for gasoline and light No change 1,000 hydrocarbons (Moved into Table)
C5-C8 Aliphatics 800 700
C9-C12 Aliphatics 500 1,000
EPH/TEH Screen Fractionization 500 1,000 Required
TEH ceiling for diesel and heavy No change 1,000 hydrocarbons (Moved into Table)
C9-C18 Aliphatics 500 1,000 Surface Soils (Residential Land Use)
RBCA Screening Level Contaminant of Depth to Groundwater (mg/kg) Concern Old (2007) New (2009) <10 feet 40 60 C5-C8 Aliphatics 10-20 feet & >20 feet 40 60
C9-C12 Aliphatics All 90 100 <10 feet 10 6
Ethylbenzene 10-20 feet 40 6 >20 feet 60 6
Xylenes All 30 70 <10 feet to Groundwater 9 4 Naphthalene 10-20 feet & >20 feet 10 4
C19-C36 Aliphatics All 2,500 20,000 PAHs All 70% Decrease Surface Soils (Commercial Land Use)
RBCA Screening Level Contaminant of Concern Depth to Groundwater (mg/kg) Old (2007) New (2009) < 10 feet 300 200 C5-C8 Aliphatics 10-20 feet & >20 feet 300 300
C9-C12 Aliphatics All 500 700 < 10 feet 10 10 Ethylbenzene 10-20 feet 40 30 >20 feet 60 30 < 10 feet 100 200 Xylenes 10-20 feet & >20 feet 100 300 <10feet< 10 feet 9 9 Naphthalene 10-20 feet 30 20 >20 feet 40 20
C9-C18 Aliphatics All 900 1,000
C19-C36 Aliphatics All 5,000 100,000 PAHs All 49% Decrease Sub-Surface Soils > 2 feet below ground surface
RBCA Screening Level Contaminant of Concern Depth to Groundwater (mg/kg) Old (2007) New (2009) <10 feet 300 200 C5-C8 Aliphatics 10-20 feet & >20 feet 400 500
C9-C12 Aliphatics All 500 1,000
<10 feet 100 100
C9-C10 Aromatics 10-20 feet 500 500 >20 feet 500 700 <10 feet 200 200 Xylenes 10-20 f eet & >20 f eet 200 600
C9-C18 Aliphatics All 1,000 2,000
C19-C36 Aliphatics All 5,000 100,000 Beneficial Use Removed Ceiling Soil Concentrations • Surface Soil • Subsurface Soil
Replaced with Narrative Standards • Odors = N u isance
• Note: The presence of odors within structures should albltdfitiik!lways be evaluated for vapor intrusion risks! RCRA Metals Screening Levels Screening Level Metal (mg/kg) Source
Arsenic 40 MT DEQ Action Levels (April 2005)
Barium 820 EPA MCL-Based Soil Screening Level (X 10) (2008)
Cadmium 3.8 EPA MCL-Based Soil Screening Level (X 10) (2008)
Chromium 280 EPA Regi ional S creeni ng L evel (April 2009)
Lead 400 EPA Regional Screening Level (April 2009)
Mercury 1.0 EPA MCL -Based Soil Screening Level (X 10) (2008)
Selenium 2.6 EPA MCL-Based Soil Screening Level (X 10) (2008)
Silver 8.9 ((QDEQ-7 Tapp)( Water) X (Soil Screenin g)g Level) X 10 Conclusions
• RBCA is a simple methdhod to eva luate petroleum risks.
• Protective across Montana.
• Can always calculate site-specific values.
• Updates will allow more site closures. Questio ns ?