lynden wastewater treatment plant - outfall replacement project
Owner
City of Lynden
Location
Lynden, Washington
The Watershed Company conducted turbidity monitoring during in-water construction for the City of Lynden Outfall Replacement Project. Turbidity monitoring occurred from August through September 2019 in the Nooksack River near the Lynden Wastewater Treatment Plant. Turbidity monitoring occurred according to the terms and conditions provided by National Marine Fisheries Service (NMFS) and US Fish and Wildlife Service (USFWS). Monitoring occurred each day when in-water construction or sediment generating activities were being conducted.
Coordination with both NMFS and USFWS resulted in a modified approach utilizing a combination of both agency’s conditions to conduct the monitoring. Turbidity measurements were taken using a HACH 2100Q turbidimeter. Background samples were taken approximately 100 feet upstream of the work area. Two compliance samples were taken per monitoring interval, one approximately 100 feet downstream and the other approximately 300 feet downstream from the work area. Excellent communication between the contractor, on-site engineer and The Watershed Company biologists facilitated lower exceedance times and fewer occurrences.
SERVICES
Turbidity monitoring
Samples and reporting
Multiple agency communication
