DERR-2024-008864

Initial Screening Levels
November 1, 2005

Contaminants* Groundwater
(mg/L)
Soil
(mg/kg)
Benzene 0.005 0.2
Toluene 1.0 9
Ethylbenzene 0.7 5
Xylenes 10.0 142
Naphthalene 0.7 51
Methyl t-butyl ether (MTBE) 0.2 0.3
Total Petroleum Hydrocarbons
(TPH) as gasoline 1 150
Total Petroleum Hydrocarbons
(TPH) as diesel 1 500
Oil and Grease or Total
Recoverable Petroleum
Hydrocarbons (TRPH)
10 1000

Tier 1 Screening Criteria
November 1, 2005

Tier 1 Screening Levels are applicable only when the following site conditions are met:
1.) No buildings, property boundaries or utility lines within 30 feet of the highest
measured concentration of any contaminant that is greater than the initial screening
levels but less than or equal to the Tier 1 screening levels AND,
2.) No water wells or surface water within 500 feet of highest measured concentration
of any contaminant that is greater than the initial screening levels but less than or
equal to the Tier 1 screening levels.
Contaminants * Groundwater
(mg/L)
Soil
(mg/kg)
Benzene 0.3 0.9
Toluene 3 25
Ethylbenzene 4 23
Xylenes 10 142
Naphthalene 0.7 51
Methyl t-butyl ether (MTBE) 0.2 0.3
Total Petroleum Hydrocarbons
(TPH) as gasoline 10 1500
Total Petroleum Hydrocarbons (TPH) as
diesel 10 5000
Oil and Grease or Total Recoverable
Petroleum
Hydrocarbons (TRPH)
10 10000