Airport Infrastructure Upgrades

The project involves providing all necessary design, permitting, environmental, and construction services for the replacement of three sanitary force mains.

I. General Requirements:

• Site investigation, testing, analysis, and utility locating.
• Full design and permitting for all work.
• Environmental testing and remediation services, including soil management and dewatering plans for potentially contaminated soil.
• Extensive stakeholder coordination with multiple parties.

II. Construction Packages:

A. Package #1: Base Work

• Replacement of approximately 300 linear feet of 12-inch sanitary force main and associated piping at the North Pump Station. This includes replacing the piping manifold within the dry-well and the discharge pipe from the pumps.
• Installation of a new 12-inch HDPE force main from the Pump Station discharge header to the property line.
• Replacement of approximately 350 linear feet of an 8-inch sanitary force main at the  Roads Pump Station.
• Replacement of approximately 880 linear feet of a 12-inch sanitary force main to the proposed connection point. 
• Installation of new valve vaults for future connection to Package #2.
• Maintenance-of-traffic and site restoration, including erosion and sediment control and tree/shrub protection.

B. Package #2: Alternate Work (within NPS property)

• Rehabilitation of approximately 2,468 linear feet of a 12-inch sanitary force main at the Pump Station using Cured-in-Place Pipe (CIPP) via trenchless utility construction.
• Rehabilitation of approximately 2,429 linear feet of an 8-inch sanitary force main at the Roads Pump Station using CIPP.
• Replacement of approximately 350 linear feet of a 12-inch sanitary force main near the Route 233 viaduct.
• Construction of a new manifold vault and a new sanitary force main crossing under the GWMP using jack-and-bore casing methods.
• Routing of the three force mains to the new manifold vault and connecting them to the existing 14-inch force main going under the CSX line.
• Verification of peak flows and overall system performance.
• Maintenance-of-traffic and site restoration, including temporary relocation.

III. Technical Requirements

• Methodologies: Use cut-and-cover for ductile iron pipe, jack-and-bore for pipes under roadways, horizontal directional drilling for HDPE pipe, and CIPP for trenchless rehabilitation.
• Outages: All work must be planned and coordinated for low-flow conditions to minimize interruption of sanitary flow. Bypass pumping and pump-and-haul operations will be required.
• Safety: The project requires a strong safety approach, including a low Experience Modification Rate (EMR) and Days, Away, Restriction, and Transfer (DART) rates.
• Environmental: Compliance with Virginia’s Erosion and Sediment Control and Stormwater Management regulations. Proper handling and disposal of assumed contaminated soil and water is mandatory.