1/18/2024 0 Comments Pond and shore dredgingOther areas of the lagoon contained clean sandy deposits, and an adjacent beach was well known to be in need of sand replenishment. The elevated sediment nutrients are at levels that constitute an ongoing contamination source to the system, contribute to water quality pollution, and promote eutrophic conditions. The restoration area included a significant sediment management challenge: one area of the lagoon was historically used as a sewage pond, and contaminants remained in a significant volume of sediments. By using clean sand beneficially at adjacent beaches, a containment pit for contaminated sediments is created, coastal protection is improved, and several restoration objectives are being achieved at a low cost. Project designers recognized that hauling sediments offsite would be a cost burden, and realized that other areas contained deep layers of sandy material. One area includes sediments contaminated by historical sewage ponds which are an ongoing source of excess nutrients to the estuary. This restoration project is a component of an infrastructure project to upgrade a road and rail crossing of the San Elijo Lagoon (an Ecological Reserve) in southern California. CEDA presentations at third party eventsīeach replenishment and lagoon restoration.Financing Sustainable Marine and Freshwater Infrastructure.Dredging for Sustainable Infrastructure.Checklist for successful dredging management.Beneficial use of sediments: Case studies.
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