USACE Resumes Dredging in Grand Haven, Michigan
The source of the E. coli is still unknown, but severe rains last week around the Grand River watershed are suspected as a potential source of the bacteria. Ottawa County lifted its E. coli warning order Saturday following several tests showing the water around the park was again at safe levels.
To ensure public health and safety, the Army Corps has worked with officials from the Ottawa County Health Department and the state of Michigan to develop a robust testing plan to restart dredging. Rapid testing will be conducted in the river, from the dredging pipeline outflow, at knee-level in the water column out from the pipeline and 100 yards north and south of the pipeline.
Water samples will be collected during the active dredge material placement operation at North Park Beach and analyzed on a contract basis by TRACE Analytical Laboratories, based in Muskegon, for E. coli using a method known as HACH M-Coli Blue 24. Testing will start the first day of dredging and continue each day active dredging is being conducted. The test results will be coordinated with the county to inform the public and ensure public health.
All residents and beachgoers must keep out of the construction zone. Safety cones are placed around the areas of active bulldozing and pipeline discharge. Additional signs and fencing will be placed 100 yards around the dredging material placement site at North Park Beach to discourage the public from swimming near the dredging equipment.
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