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Title

Quality Assurance Project Plan: Guidance for the WDOE NWTPH-Dx Method for Testing Groundwater

 
Publication number Date Published
22-03-101January 2022
VIEW NOW Quality Assurance Project Plan: Guidance for the WDOE NWTPH-Dx Method for Testing Groundwater (Number of pages: 40) (Publication Size: 1421KB)




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Author(s) Hobbs, W.
Description Under the Model Toxics Control Act (MTCA) Cleanup Regulation, Method A is one of the most common approaches used to establish cleanup levels that are applicable to groundwater impacted by hydrocarbons. Under Method A, a total petroleum hydrocarbon (TPH) approach may be taken.

In 1997, the Washington State Department of Ecology (Ecology) published analytical methods for TPH. Under guidance by Ecology’s Toxic Cleanup Program, a silica gel cleanup (SGC) step can be employed where groundwater may contain a component of naturally occurring organics that may interfere with the NWTPH-Dx analysis. Since the original publication of the NWTPH method for water, there have been no updates or guidance offered that address possible clarification and improvements to the SGC step.

This project will survey accredited labs to ascertain how the NWTPH-Dx method is currently being used. Participating labs will then work with Ecology’s Manchester Environmental Laboratory to (1) provide guidance on how the SGC step within the NWTPH-Dx method could be improved and clarified for groundwater samples and (2) participate in an interlaboratory comparison using a revised approach.

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Contact Will Hobbs at 360-407-6764 or whob461@ecy.wa.gov
Keywords QAPP, polar metabolite, weathered diesel, toxicity, hydrocarbon, NWTPH
DATA Environmental Information Management (EIM) #WHOB005

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