Flushing Bay CSO Storage Tunnel

Flushing Bay CSO Storage Tunnel

United States

This preferred 25 MG CSO Storage Tunnel alternative is projected to result in full attainment of the existing pathogen criteria and will provide significant reduction in CSO volume and frequency of overflow. The preferred alternative for the Flushing LTCP is projected to reduce CSO discharges from Outfalls. BB-006 and BB-008 to Flushing Bay by 53 percent from 1,405 MG/year to 659 MG/year. CSO events are projected to be reduced by 70 percent from 47 to 14 events annually. The implementation of these elements has an estimated Net Present Worth ranging from $683M to $842M, reflecting $0.9M of annual O&M over the course of 20 years and a PBC ranging from $670M to $829M.

While the existing projects in Flushing Bay successfully reduced CSO Volume by 20% the approved plan focuses on reducing additional 50% of CSO by volume.

Probable Bid Cost: $829M
Total Escalated Cost: $1,616M (Includes Design, Design Services during Construction, Construction, and Construction Management Costs, escalated per the implementation schedule.)

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