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About Us

Research & Data

Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.

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Preproposal Statement of Inquiry (CR-101) (WAC 173-360; WAC 173-360A) 03/23/2016
This is a rulemaking announcement (CR-101) for WAC 173-360 Underground Storage Tank (UST) Regulations.
Preliminary Draft - Overview of Changes (WAC 173-360; WAC 173-360A) 07/10/17
This document provides a summary of the proposed changes to WAC 173-360, Underground Storage Tank (UST) Regulations, included in the preliminary draft rule.
Preliminary Draft - Parts 1-9 (WAC 173-360; WAC 173-360A) 07/10/17
This document includes Parts 1 through 9 of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Preliminary Draft - Part 10 (Financial Responsibility) (WAC 173-360; WAC 173-360A) 07/10/17
This document includes Part 10 (financial responsibility) of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Preliminary Draft - Summary - Deferred UST Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17
This table summarizes the dates by which owners and operators of previously deferred underground storage tank (UST) systems installed on or before the effective date of the UST rule would need to comply with the requirements of the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Preliminary Draft - Summary - O&M Compliance Dates (WAC 173-360; WAC 173-360A) 07/10/17
This table summarizes operation and maintenance compliance dates under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Preliminary Draft - Summary - UST Record Retention Periods (WAC 173-360; WAC 170-360A) 07/10/17
This table summarizes how long owners and operators of underground storage tank systems would need to retain records of various regulated activities under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Preliminary Draft - Summary - Certification for UST Services (WAC 173-360; WAC 173-360A) 07/10/17
This table identifies the underground storage tank system services requiring the use of a service provider and the certification that a service provider must have to perform those services under the preliminary draft of WAC 173-360A, Underground Storage Tank (UST) Regulations.
Ecology's contained-in determination policy memo
Ecology's policy about contained-in determinations.
2011 MTCATPH Excel Spreadsheet's Troubleshooting Guide
Troubleshooting guide with operating tips for common installation problems associated with compatibility with MS EXCEL 2000, 2003, 2007, 2010 versions.
MTCATPH
An online tool for calculating cleanup levels for petroleum mixtures under the Model Toxics Control Act.
Package A - Natural Attenuation Tool (Modules 1,2,3)
A calculation tool for demonstrating natural attenuation of groundwater is occurring and help predict when groundwater cleanup levels will be met under the Model Toxics Control Act.
Package B - Natural Attenuation (Modules 4,5,6)
A calculation tool for demonstrating natural attenuation of groundwater is occurring and help predict when groundwater cleanup levels will be met under the Model Toxics Control Act.
MTCAStat97: Site Module
A statistical analysis tool / workbook for calculating compliance statistics for sites cleaned up under the Model Toxics Control Act.
MTCAStat97: Backgound Module
A statistical analysis tool / workbook for analyzing background data for sites cleaned up under the Model Toxics Control Act.
MTCASTtat97: Technical supplement #1
Statistical guidance for using MTCAStat97 for sites cleaned up under the Model Toxics Control Act.
2015 changes to 2009 vapor intrusion toxicity values and screening levels
2015 Excel spreadsheet of changes to the 2009 vapor intrusion toxicity values and screening levels.
MTCATPH11.1
An online workbook to help you calculate cleanup levels for petroleum contaminated sites.
GIS Applications
Find a list of GIS applications at Ecology.
SCUM II's Appendix K: Risk-based Cleanup Levels Calculation Spreadsheets
Appendix K of the Sediment Cleanup User's Manual (SCUM II) contains spreadsheets to use as a resource for calculating risk-based concentrations for sediment and tissue. These are used in conjunction with the recommended exposure parameters in SCUM II's Chapter 9.
188 results 1 - 20 of 188   Next page