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Best Management Practices for Chemical Treatment Systems for Construction Stormwater and Dewatering
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5. Maintenance And Decommissioning
5.1 Sediment Removal and Disposal
- Sediment should be removed from the storage or treatment cells as necessary. Typically for systems using flocculants, sediment removal is required at least once during a wet season and at the decommissioning of the cells. Also, when a sediment collection area has reached 1/3 capacity, the sediment should be removed and taken to a location where it can be stabilized (vegetated) or buried to prevent off-site transport. If sediment removal is not necessary during the life of the project, the sediment ponds can simply be filled in at decommissioning.
- Sediment remaining in the cells between batches may enhance the settling process and could reduce the required chemical dosage in the primary system.
- When decommissioning, sediment must be stabilized away from drainages, which can include being incorporated into the roadway or being stabilized in-place.
5.2 Adjustment of Settling and Retention Ponds
If stormwater detention ponds have been modified for use as sediment treatment ponds, then they must be restored to flow control mode as originally designed (e.g., baffles be removed, designed volume restored etc.).
5.3 Remove All Equipment and Chemicals from the Site and Store in a Safe Manner
All equipment and chemicals that were used on the site must be removed and stored in a designated and safe place.
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