Douglas County Ionwave #CI-2026-0100 Addendum 3

Omaha Public Works Solicits Bids for North Downtown Conveyance Sewer Construction (Microtunneling & Hand-Mining)

The City of Omaha Public Works Department is soliciting bids for the construction of the North Downtown Conveyance Sewer (NDCS), a major infrastructure project supporting the Northeast Omaha High-Rate Treatment Basin (NEOHRTB). - Buyer: City of Omaha, Public Works Department (Douglas County Purchasing) - Project scope: - Construction of a 1,970-foot-long, 72-inch diameter combined sewer gravity conveyance using microtunneling and hand-mining within bedrock - Launching and receiving shafts, site restoration, and reinforced concrete pipe for jacking - Tunneling operations require specialized equipment (MTBM/slurry machines, TBM), rock blasting, and installation of monitoring instrumentation (seismographs, piezometers, inclinometers, monitoring wells) - Products/services requested: - Mobilization/Demobilization, Bonds, Permits, Insurance (Part 9000.001) - NDCS Launch Shaft (GNI Drop Shaft) (Part 9000.002) - NDCS Temporary Receiving Shaft (Part 9000.003) - NDCS 72-inch Tunnel (TBM) (Part 9000.004) - NDCS 72-inch Tunnel (Hand-Mine) (Part 9000.005) - Site Restoration (Part 9000.006) - Reinforced Concrete Pipe for Jacking - Tunneling Equipment - Contingency allowances for probing, grouting, stormwater pollution prevention, environmental, street repairs, railroad flagging, and project management software - Services requested: - Tunnel construction (TBM and hand-mined) - Excavation, rock blasting, erosion and sedimentation control - Instrumentation and monitoring installation - Economic Sustainability Program (ESP) plan compliance services - Unique requirements: - Minimum 3.5% Small & Emerging Small Business (SEB/ESB/SB) participation - Annual Economic Sustainability Program (ESP) plan targeting workforce development in economically distressed areas - Optional apprentice utilization incentive (10% labor hours by apprentices) - Strict compliance with Union Pacific Railroad standards for pipeline crossing and flagging - Settlement monitoring, shaft/tunnel excavation in bedrock, and US Army Corps of Engineers review - Temporary shaft covers to remain in place for 5 years post-completion - Lump sum contingency allowances for environmental and project management needs - No specific OEMs or named vendors; bidders must provide all equipment and materials per specifications.

Description

The City of Omaha is soliciting bids for the construction of a 1,970-foot-long, 72-inch inside diameter combined sewer gravity conveyance sewer using microtunneling and hand-mining within bedrock. The project also includes the construction of launching and receiving shafts for tunnel construction. Bidders must submit an Economic Sustainability Plan (ESP) and may optionally utilize an apprentice incentive program. A bid bond or acceptable substitute is required, with specific conditions outlined for submission and acceptance.

View original listing