Fish Study Update March 2011

Page 1

720 Olive Street, Suite 1900 Seattle, Washington 98101 Phone 206.287.9130 Fax 206.287.9131 www.anchorqea.com

MEMORANDUM To:

Bruce Mackey, ESA Adolfson

Date:

March 10, 2011

From:

Carmen Andonaegui, Anchor QEA

Project:

100705-01.01

cc:

Paul Schlenger, Anchor QEA

Re:

Update on Activities Underway for Chehalis River Fish Study

This memorandum describes the activities underway by the Anchor QEA Team for the Chehalis River Fish Study. Update information is provided on three main topics: field work, data compilation and analysis, and upcoming activities.

FIELD WORK Continuously-logging temperature data loggers (Tidbits) are still deployed at the ten water quality sample locations where they were installed in August 2010. On February 17, 2011, a final download of the data from the Tidbits was completed and final water quality measurements and water samples were collected for use in the water quality analysis and fish effects study. River flow was above 7500 cfs (how much above) during this event. The Tidbit data loggers will be left in place, and when low flow conditions resume, data will be downloaded a final time (how many “final” times will there be?), although the data is not intended for use in the analysis. The Tidbit loggers can be left in place at the Flood Authority’s request, where they will continue to collect data for download by Flood Authority staff in the future (There’s no Flood Authority staff, and soon there will be no Flood Authority). The collection of water quality data and water samples on February 17th was the second of two required high flow sample events for use in the analysis. With the two low flow water quality sampling events conducted in September and October 2010, this completes the collection of water samples and water quality data. Data collection at low and high flow conditions at the survey locations for IFIM has been completed. A middle flow data collection event is planned for late March or April. Gravel sampling (surface pebble counts and sub-armor grab samples) has been completed.


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