For information about the Washington State rule-making suspension, go to Ecology's Rule-Making Suspension Update page.
Testing required for Petroleum Releases is indicated in the table below. Where testing is required for a substance or compound, a note is present in the applicable cell. For example, Testing for Benzene is required for Gasoline Range Organics, Diesel Range Organics, waste oils and unknown oil. The notes provide some detail regarding agency expectations. As the table indicates, testing for BTEX is required at all petroleum releases where Gasoline Range Organics, Diesel Range Organics, Waste Oils, and Unknown Oils are present. And n-Hexane must be tested for when the VPH analytical method is performed for Method B or C.
Gasoline Range Organics
Diesel Range Organics
|Waste Oils and
|Benzene||When using Method A, testing soil for benzene is required. Furthermore, testing ground water for BTEX is necessary when a petroleum release to ground water is known or suspected. If the ground water is tested and toluene, ethyl benzene or xylene is in the ground water above its respective Method A cleanup level, the soil must also be tested for that chemical. When using Method B or C, testing the soil for BTEX is required and testing for BTEX in ground water is required when a release to ground water is known or suspected.||For DRO releases from other than home heating oil systems,
follow the instructions for GRO releases to the left.
For DRO releases from typical home heating oil systems (systems of 1,100 gallons or less storing heating oil for residential consumptive use on the premises where stored), testing for BTEX is not usually required for either ground water or soil. Testing of the ground water is also not usually required for these systems; however, if the ground water is tested and benzene is found in the ground water, the soil must be tested for benzene.
|Testing is required in a sufficient number of samples to determine whether this chemical is present at concentrations of concern. If the chemical is found to be at levels below the applicable cleanup level, then no further analysis is required.|
|Toluene||Same as for GRO for Benzene||Same as for DRO for Benzene||Same as for Benzene|
|Ethyl benzene||Same as for GRO for Benzene||Same as for DRO for Benzene||Same as for Benzene|
|Xylenes||Same as for GRO for Benzene||Same as for DRO for Benzene||Same as for Benzene|
|n-Hexane||Testing for n-hexane is required when VPH analysis is performed for Method B or C. In this case, the concentration of n-hexane should be deleted from its respective fraction to avoid double-counting its concentration. n-Hexane's contribution to overall toxicity is then evaluated using its own reference dose.|
[Footnotes for Table 830-1]
[Table 830-1] [Other Compounds] [Fuel Additives and Blending Compounds] [Other Petroleum Compounds] [Volatile Petroleum Compounds] [Index of Tables] [TEE Definitions]