Publication Summary

This is the sampling and analysis plan and the quality assurance plan for the Bear/Evans Watershed Temperature and Dissolved Oxygen Total Maximum Daily Load Study.

Monitoring of temperature and/or dissolved oxygen by the King County Department of Natural Resources, the City of Redmond, Northeast Sammamish Sewer and Water District (NES), and Union Hill Water Association (UHWA) indicates that there are segments of streams in the Bear/Evans watershed that do not meet the water quality standards for temperature or dissolved oxygen for varying periods of time between June and October. These segments are listed under Section 303(d) of the Clean Water Act as impaired waters. The present study is designed to organize and evaluate existing data and to supplement and integrate King County, Redmond, NES, and UHWA data collection to ensure that the density of the monitoring sites and the frequency and duration of data collection are adequate to develop a water quality model that provides well calibrated outputs. Water quality models will be used to develop pollutant load reduction amounts needed to bring the stream segments into compliance with the state water quality standards. Data collection and model development represent a cooperative approach between King County, Redmond, NES, UHWA, and the Department of Ecology to develop Total Maximum Daily Load reduction targets for the Bear/Evans system.

Link to EIM data for User Study ID MROB002