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Quality Assurance Project Plan: Soos Creek Temperature, Dissolved Oxygen, and Bacteria TMDL Study

Publication number Date Published
23-03-105August 2023
VIEW NOW Quality Assurance Project Plan: Soos Creek Temperature, Dissolved Oxygen, and Bacteria TMDL Study (Number of pages: 143) (Publication Size: 6952KB)

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Author(s) Mathieu, N., M. Gleason, and C. Neculae
Description Data collected throughout the Soos Creek watershed show that multiple waterbodies do not meet Washington State water quality standards for temperature, dissolved oxygen, and bacteria. This Quality Assurance Project Plan (QAPP) describes data collection, analysis, and computer modeling to confirm and address these water quality issues and characterize the sources of the main water quality problems.

The study will collect information on the amount of flow, quality of the water, and biological growth in the water, stream bottom, and underlying sediments, as well as other attributes of the land, vegetation, and groundwater interaction. Ecology will collect information from April 2023 to April 2024, with more detailed information collected in the summer of 2023, when these water quality problems are more severe. Ecology will use the information to create a linked network of computer models that simulate water movement and quality through the land and in the streams. Management scenarios will be tested in the model to develop pollution limits.
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

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Contact Nuri Mathieu at 360-522-0159 or
Keywords QAPP, water temperature, Soos Creek, modeling, TMDL, dissolved oxygen, bacteria, Covington, Jenkins, Little Soos, Soos Creek Watershed, Soosette
WEB PAGE Soos Creek multi-parameter TMDL - Washington State Department of Ecology
WATERSHED Water Resource Inventory Area 09 Duwamish-Green
DATA Environmental Information Management (EIM) #NMat0009


Focus on: Soos Creek Temperature, Dissolved Oxygen, and Bacteria Study

Addendum 2: Soos Creek Supplemental Monitoring - Addendum to: Modeling Quality Assurance Project Plan for Soos Creek Watershed Temperature and Dissolved Oxygen TMDL Technical Analysis