Research & Data - Washington State Department of Ecology

Interpretive Statement on Subdivision SEPA Exemptions

SEPA Interpretive Statement

https://ecology.wa.gov/index-sea-interpretive-statement

Design requirements for infiltration trenches

Design requirements for infiltration trenches with soils considered a treatment BMP

https://ecology.wa.gov/infiltration-trench-guidance

Infographics

An infographic with key facts about the No Discharge Zone

https://ecology.wa.gov/infographics

Industrial Stormwater General Permit Frequently Asked Questions

This FAQ outlines questions and answers that Industrial Stormwater General Permit holders may find helpful. This document is intended as guidance only, and does not modify or otherwise change the permit requirements in the Industrial Stormwater General Permit.

https://ecology.wa.gov/industrial-stormwater-general-permit-faq

Industrial Stormwater Monthly Site Inspection Form

Use this form for your monthly inspections if you are industrial stormwater permit holder. Inspections must be conducted by a person with the knowledge and skills to assess conditions and activities that could impact stormwater quality at the facility, and evaluate the effectiveness of best management practices required by this permit. Retain a copy of the completed and signed form.

https://ecology.wa.gov/industrial-stormwater-monthly-site-inspection-form

Industrial Stormwater Pollution Prevention Plan (SWPPP) Template

Use this template to guide you through developing a Stormwater Pollution Prevention Plan that is consistent with the Industrial Stormwater General Permit SWPPP.

https://ecology.wa.gov/industrial-stormwater-pollution-prevention-plan-te

Implementation dates (WAC 173-446) 9-29-22

This is the September 29, 2022 implementation timeline for Chapter 173-446 WAC, Climate Commitment Act Program.

https://ecology.wa.gov/implementation-dates-wac-173-446-9-29-22

Indirect Land Use Conversion (WAC 173-424) 04/04/22

This documents indirect land use conversion for Washington Clean Fuels Standard, April 4, 2022 version.

https://ecology.wa.gov/indirect-land-use-conversion-wac-173-424-04-04-22

Indirect Land Use Conversion (WAC 173-424) 03/10/22

This documents indirect land use conversion for Washington Clean Fuels Standard.

https://ecology.wa.gov/indirect-land-use-conversion-wac-173-424-03-08-22

Industrial Stormwater General Permit

We issued the Industrial Stormwater General Permit in 2014. This is a National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit for stormwater discharges associated with industrial activities.

https://ecology.wa.gov/industrialstormwatergeneralpermit

Inert Criteria Work Group Agenda - April 23, 2014

https://ecology.wa.gov/inert-criteria-work-group-agenda-april-23-2014

Inert Criteria Work Group Agenda - April 29, 2015

https://ecology.wa.gov/inert-criteria-work-group-agenda-april-29-2015

Inert Criteria Work Group Agenda - July, 30, 2014

https://ecology.wa.gov/inert-criteria-work-group-agenda-july-30-2014

Inert Criteria Work Group Agenda - June, 10 2014

https://ecology.wa.gov/inert-criteria-work-group-agenda-june-10-2014

Inert Criteria Work Group Notes - April 23, 2014

https://ecology.wa.gov/inert-criteria-work-group-notes-april-23-2014

Inert Criteria Work Group Notes - July 30, 2014

https://ecology.wa.gov/inert-criteria-work-group-notes-july-30-2014

Inert Criteria Work Group Notes - June 10, 2014

https://ecology.wa.gov/inert-criteria-work-group-notes-june-10-2014

Inert Criteria Work Group Notes April 29, 2015

https://ecology.wa.gov/inert-criteria-work-group-notes-april-29-2015

Informal draft rule changes to 173-441 WAC for Electricity Markets rulemaking

This document lists informal draft rule language changes to Chapter 173-441 WAC (Reporting of Emissions of Greenhouse Gases) for the Electricity Markets rulemaking.

https://ecology.wa.gov/informal-draft-rule-changes-to-173-441-wac-for-electricity-markets-rulemaking

Informal draft rule changes to 173-446 WAC for Electricity Markets rulemaking

This document lists informal draft rule language changes to Chapter 173-446 WAC (Climate Commitment Act Program) for the Electricity Markets rulemaking.

https://ecology.wa.gov/informal-draft-rule-changes-to-173-446-wac-for-electricity-markets-rulemaking