Special PT Requirements

Underground Storage Tank (UST) Parameters

Currently, only the following PT Providers are approved to provide PTs for the Wisconsin UST parameters:

    APG, ERA, NSI, and Wibby Environmental

Diesel Range Organics (DRO)

Requires a PT sample containing the even-numbered alkanes from C-10 to C-28.
Analysis using the Wisconsin specific DRO method is required.

Gasoline Range Organics (GRO)

Requires a PT sample containing the following analytes:

Methyl-t-butyl ether	Ethylbenzene	o-Xylene	Naphthalene
Benzene	m-Xylene	1.2.4-Trimethylbenzene
Toluene	p-Xylene	1.3.5-Trimethylbenzene

Analysis using the Wisconsin specific GRO method is required.

Petroleum Volatiles (PVOC)

Requires a PT sample containing the following analytes:

Methyl-t-butyl ether	Ethylbenzene	o-Xylene
Benzene	m-Xylene	1.2.4-Trimethylbenzene
Toluene	p-Xylene	1.3.5-Trimethylbenzene

NOTE: A GRO PT sample can usually be analyzed for both GRO and PVOC simultaneously.

PAHs by HPLC and SIM-GC/MS

• The concentrations of PTe sample results submitted for polynuclear aromatic hydrocarbons (PAHs) for the high performance liquid chromatography (HPLC) technology must be representative of the lower concentration ranges detectable by HPLC.
• PAH PT samples with higher concentrations representative of the ranges detectable by GC or GC/MS will not be accepted for certification for the HPLC technology.
• When ordering reference samples for PAHs by HPLC, request PT samples in the concentration range appropriate for HPLC analysis by the State of Wisconsin.