2004 Pre-Construction Eelgrass Monitoring and Propagation for King County Outfall Mitigation

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This report describes activities through calendar year 2004 on two major pre-construction eelgrass mitigation tasks. The first was a pre-construction eelgrass mapping survey by side-scan sonar and underwater videography, which covered the entire nearshore area from approximately 65 meters north of the Marine Outfall Corridor to approximately 10 meters south of the Eelgrass Reference Area, and offshore (west) to a depth of -25 feet mean lower low water. The second pre-construction eelegrass mitigation task involved harvesting of eelgrass shoots from the study area (marine outfall corridor) for propagation and stockpiling, which will occur over the 5-year pre-construction period, with the goal of providing a sufficient stock of local plants for post-construction site restoration. Experimental harvest plots in the outfall corridor area will be monitored to determine recovery rates relative to harvest rates, to determine an optimum harvest rate that allows for rapid recovery of donor eelgrass beds.

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2004 Eelgrass Monitoring Report