Instructions for using the Arc Reader to locate 12-Digit HUCs

We created a responsiveness summary based on comments received, including our response to each comment

This is a white paper that discusses the use of surrogates in Total Maximum Daily Load (TMDL) water cleanup plans.

This version of the policy shows all of the changes to the previous language with underline/strikeout markings

is a quality-control tool for environmental laboratories.

Policy 1-11 Public Dialogue TMDL Prioritization Issues Paper

Use this form when you have completed deconstruction and no longer need coverage under the permit.

Use this form to transfer permit coverage to a new operator

This fact sheet is a companion document to the draft National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit for Discharges Associated with Vessel Deconstruction Activity (Vessel Deconstruction General Permit, or VDGP). The proposed permit authorizes the discharge of stormwater and a limited number of non-stormwater discharges.

Determined to be functionally equivalent to a Bioretention Planter or Planter Box

Ecology finds Tigerfloc functionally equivalent to the flocculent chemicals identified in Best Management Practice C250 (Construction Stormwater Chemical Treatment) for stormwater management. Contractors may use Tigerfloc as a replacement for other approved chemicals such as ChitoSan Acetate when operating an enhanced sand filtration system on construction sites.

Ecology finds ToriShell functionally equivalent to C126 Polyacrylamide for soil erosion and dust control.

Ecology finds Track Clean™ Construction Entrance Plates can be used as a temporary erosion control mechanism. These plates must adhere to the guidelines of Best Management Practice C105 (Stabilized Construction Entrance) for stormwater control.

Determined to be functionally equivalent to a Bioretention Planter or Planter Box

Timelines for continuing Western Washington Phase II Municipal Stormwater Permittees

Timelines for new Western Washington Phase II Municipal Stormwater Permittees

This spreadsheet shows treatment systems that may be effective in treating specific contaminants. Users should evaluate the effectiveness of any treatment system they plan to implement and confirm that the chosen treatment system does not cause or contribute to a violation of the water quality standards.

3/14/17: W.WA Municipal Stormwater Permit Reissuance public meeting– Vancouver

Edits to the preliminary draft of the Sand and Gravel General Permit.

Sand & Gravel General Permit Preliminary draft with track changes