Workers used chemical treatment on the Lincoln Memorial Reflecting Pool to combat algae growth that turned the water dark green after a renovation project. The algae bloom emerged shortly after the renovation was completed, and the use of chemicals has drawn attention from local residents and raised environmental concerns. The renovation was a costly project, and the algae problem suggests inadequate planning for water quality management in the initial design. While the project faced documented troubles, the specific details about the chemicals used, the exact cost, and the framing of this as a deliberate "coverup" go beyond what's clearly established. This appears to be a remediation attempt for a genuine water quality problem rather than simply a failure being hidden—though it does point to shortcomings in how the renovation was planned and executed.