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

This is a PDF of the PowerPoint presentations provided at the February 2019 hearings on the draft EIS and short-term modification language for total dissolved gas criteria in WAC 173-201A.

Signed short term modification administrative order for total dissolved gas criteria

is a quality-control tool for environmental laboratories.

Policy 1-11 Public Dialogue TMDL Prioritization Issues Paper

This is a supporting document showing the proposed edits to Chapter 173-201A WAC Table 602 and Table 612 in track changes.

Example template of a Stormwater Pollution Prevention Plan (2012) This template was prepared by the Northwest Marine Trade Association (NMTA) for use by its boatyard members. NMTA has granted the Department of Ecology permission to make this form available to all interested parties.

Examples of Stormwater Pollution Plan Worksheets (2007)

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.

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.

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

Sand & Gravel General Permit Preliminary draft with track changes

This annual report reviews Zostera Japonica controls on commercial clam beds in Willapa Bay for Taylor Shellfish.

Annual pre-treatment plan for Zostera japonica control on commercial clam beds in Willapa Bay for Tylor Shellfish