To help laboratories comply with and use
these analytical procedures, Restek has been
active in following the stateguidelines. Based
on our good knowledge of the methods, our
experienced chemists have developed a list of
the appropriate technical service tools and
analytical products to achieve success with
these methods. We offer quality chromato-
graphic columns, analytical referencemateri-
als, and sample preparation products.
In this comprehensive product listing, you
will find everything you need to quickly set
up or reorder consumables for these meth-
ods. Please refer toour latest product catalog
(lit. cat. #59662) or call 800-356-1688 or
814-353-1300, ext. 3, for more information.
Also, wewill be happy to provide a quote on
any custom consumable youmay need!
Regulatory and Analytical Methodology
Contact Information
UST& LUST CONTACT
WashingtonDepartment of Ecology
ToxicsCleanupProgram
P.O. Box 47600
Olympia,WA 98504-7600
Phone: 360-407-7170
Fax: 360-407-7154
Washington’s UST& LUST program
maintains aweb site at
UST& LUST CONTACT
OregonDepartment of
Environmental Quality
USTProgram, 811SWSixthAvenue, 9thFloor
Portland, OR 97204
Phone: 503-229-5733 or 1-800-742-7878
Fax: 503-229-6954
Oregon’s UST& LUST program
maintains aweb site at
✔
Comprehensive product listing for the latest USTmethods used by
the States of Oregon andWashington.
✔
Products conveniently organized bymethod number.
✔
Easymethod set-up and reorder of consumables, including:
Gas chromatography columns and accessories,
Analytical referencematerials,
Sample preparation supplies,
Technical service.
Washington State Department of Ecology (WSDE) has been using analytical methods for
the analysis of total petroleum hydrocarbons (TPH) since 1991. These analytical methods,
known asWTPHmethods, have been extensively used in underground storage tank (UST)
applications. In 1997 these methods were updated to provide additional detail, to provide
for extended analysis and to incorporate an identification (ID) method for water samples.
These updatedmethods are now calledNWTPH (“NW” = “Northwest” to reflect their use
in Oregon as well as Washington). Under NWTPH, there are three methods: NWTPH-
HCID for hydrocarbon identification; NWTPH-Gx for volatile petroleum products; and
NWTPH-Dx for semivolatile petroleum products.
In 1998WSDE completed a “working draft” of the amendment to the state cleanup law:
The Interim TPH Policy describes a new approach for petroleum: Separation into car-
bon-range fractions and use of surrogates or derived values to represent those fractions.
Two analytical methodswere adopted fromMassachusetts’Department of Environmental
Protection:VPH for volatile aliphatic and aromatic petroleum hydrocarbons, andEPH for
extractable aliphatic and aromatic petroleum hydrocarbons.
NWTPH-HCID is a qualitative and semi-quantitative screen to determine the presence
and type of petroleum products that may exist in water or soil. This method should be
used if the type of petroleum contamination is unknown, and should be performed on
contaminated soil or water that is representative of the site. The results will determine
what fullyquantitativemethod(s), if any, are needed for compliancewith thematrix criteria.
Should the value of the analysis for gasoline, diesel or heavy oils (or any other identified
petroleum product) exceed the reporting limits, the specific analytical method for that
product must be employed.
NWTPH-Gx is the qualitative and quantitative extended method for volatile (e.g., gaso-
line) petroleum products in soil andwater. Petroleum products applicable for thismethod
include aviation and automotive gasoline, mineral spirits, Stoddard solvent, and naphtha.
NWTPH-Dx is the qualitative and quantitative extended method for semivolatile (e.g.,
diesel) petroleumproducts in soil andwater. Petroleumproducts applicable for this include
jet fuels, kerosene, diesel oils, hydraulic fluids, mineral oils, lubricating oils and fuel oils.
800-356-1688
814-353-1300
At-a-Glance
Product
Information
fromRestek
Northwest Regional
USTMonitoring
