Second High Reservoir Maintenance and Improvements

The U.S. Army Corps of Engineers, Baltimore District (NAB), has been tasked to solicit for and award construction services for Reservoir Maintenance and Improvements at Washington Aqueduct Division in Washington, DC. The proposed project will be a competitive, firm-fixed-price, contract procured in accordance with FAR 14, Sealed Bidding, via an Invitation for Bid (IFB). The Washington Aqueduct provides potable water to approximately one million people in the District of Columbia and Northern Virginia. As part of the water treatment and supply system, the Washington Aqueduct maintains and operates the Dalecarlia and McMillan Water Treatment Plants (WTPs). Potable water from these WTPs is pumped via the second high service to the Second High Reservoir. This reservoir is an approximate 419 LF x 294 LF subsurface structure that is 24 feet deep that was built in 1931. It has a capacity of 15 MG and is located at the intersection of Van Ness Street and 44th Street, NW, Washington. DC. The project consists of implementing upgrades and improvements to the Second High Reservoir to address operational and sanitary survey issues previously identified. This will result in improved water quality and operation within the distribution system. The work includes the replacement of a brick Sample Building; the replacement of the 24” drain line; installation of mechanical mixers; sealing of all interior joints and cracks; installation of a spread spectrum radio communications antenna; installation of a roof sub-drainage system and the replacement of the perimeter fence. This reservoir is a critical component of the distribution system and so the reservoir outage period is restricted. An experienced contractor with resources and expertise to handle the following project constraints is needed: The reservoir roof surface has limited weight restrictions and can only be taken out of service for three (3) months. All work needing to be performed inside the reservoir has to be completed within that time frame. The demolition and re-building of brick Sample Building must be done within the limited outage window while the reservoir is out of service. Access into the reservoir structure is limited and all work therein is considered confined space work. The reservoir is located in a residential neighborhood and so noise ordinance requirements must be strictly adhered to. The existing security server and associated equipment is to be removed and re-installed by a professional security contractor.

Dam/Tunnel, Renovation.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Dam Construction and Equipment.