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Title

Petroleum Vapor Intrusion (PVI): Updated Screening Levels, Cleanup Levels, and Assessing PVI Threats to Future Buildings (Implementation Memo No. 18)

 
Publication number Date Published Date Revised
17-09-043August 2017January 2018
VIEW NOW: Petroleum Vapor Intrusion (PVI): Updated Screening Levels, Cleanup Levels, and Assessing PVI Threats to Future Buildings (Implementation Memo No. 18) (Number of pages: 44) (Publication Size: 390KB)
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Author(s) Policy & Technical Support Unit, Toxics Cleanup Program
Description This memorandum provides petroleum vapor intrusion (PVI) guidance from the Washington State Department of Ecology.

This memo supplements the information in Implementation Memo No. 14 (publication no. 16-09-046). It also: 1) Provides the basis for several modifications to the CLARC data tables to account for the additive effects of non-carcinogenic compounds present in petroleum mixtures. This includes establishing a generic TPH cleanup level of 140 µg/m3 as well as corresponding sub-slab and deep soil gas screening levels. 2) Explains how to assess whether PVI represents a reasonably likely threat to future buildings. 3) Provides additional direction for developing Tier I or Tier II PVI sampling plans.

This memo primarily applies to releases of petroleum-containing fuels from:
1) underground storage tanks, 2) spills, 3) home heating oil tanks, and 4) bulk tank farms. This memo should be used when sites do not initially “screen out” using the process established in Implementation Memo No. 14, or when further vapor evaluation is necessary after implementing the selected cleanup action.

A note about this revision: This implementation memo was originally published as a draft in August 2017 and a revised draft in November 2017. It was finalized in January 2018 based on comments received during a public comment period from August 7 through September 22, 2017.
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Keywords Total petroleum hydrocarbons (TPH), Air cleanup levels, Petroleum vapor intrusion (PVI), Groundwater cleanup levels, Soil gas screening levels, Groundwater vapor intrusion screening levels, Model Toxics Control Act (MTCA)
WEB PAGE Vapor Intrusion
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