Policies & Guidance
Provides links to Ecology’s policies, procedures, and
technical memorandum related to the implementation of the laws
and rules governing the cleanup of contaminated sites.
Provides links to checklists and suggested templates that you can use to prepare remedial action plans and reports under MTCA.
Provides information about and links to model remedies that Ecology has developed or is developing. Model remedies are intended to streamline and accelerate
the selection of cleanup actions at contaminated sites under MTCA.
Provides information and guidance on the use of empirical data under MTCA to demonstrate that soil concentrations measured at a contaminated site have not caused,
and will not cause, an exceedance of the applicable groundwater cleanup levels.
Provides an interactive guide to the terrestrial ecological evaluation process under MTCA. The evaluation is used to determine
whether hazardous substances may harm the plants or animals at a contaminated site and to establish protective soil cleanup standards.
Provides links to Ecology’s
2009 Draft Vapor Intrusion Guidance, EPA’s latest guidance
documents published in 2015, and Ecology’s vapor intrusion
screening levels updated in April 2015.
Provides links to the rules and guidance governing the cleanup of contaminated sediment under MTCA,
regional background studies of sediment, and more.
This document provides general guidance on the cleanup of petroleum-contaminated sites under MTCA,
including sites with leaking underground storage tanks.
Provides links to guidance and calculation tools for demonstrating natural attenuation of groundwater and enabling predictions of when
groundwater cleanup levels will be met.