Inactive

The Washington Aqueduct (WA), a division of the Baltimore District United States Army Corps of Engineers (USACE), treats water drawn from the Potomac River to produce drinking water for Washington, DC... The Washington Aqueduct (WA), a division of the Baltimore District United States Army Corps of Engineers (USACE), treats water drawn from the Potomac River to produce drinking water for Washington, DC, and portions of Northern Virginia. WA is unique in the Department of Defense, and possibly the Nation, in that the Federal government owns and operates a public utility. WA has the responsibility to provide safe, reliable, and cost effective drinking water to approximately one million consumers, through its three wholesale customers, 24 hours a day, seven days a week. WA is the sole source of potable water supply to most of these consumers in Washington DC, Arlington County VA, and Falls Church VA. The Washington Aqueduct (WA) maintains and operates two water treatment plants (WTPs), the Dalecarlia WTP and the McMillan WTP. The Dalecarlia Water Treatment Plant operates multiple dual media filters for water filtration and purification purposes. When the filters are in use, the pressure loss across the media gradually increases and eventually the filter must be cleaned (backwashed) to continue functioning within the specified water quality limits. During the filter backwash process, high volumes of water are used to fluidize the filter media and release the trapped solids. At the Dalecarlia WTP, there are two wash water storage reservoirs which store water from the 1st High pressure zone for filter backwash purposes. These tanks are known as the Underground Tank and Elevated Tank, respectively. Age and sanitary survey of the water treatment plants identified some deficiencies regarding the wash water storage reservoir. Wash water is supplied to the wash water storage reservoirs through an altitude valve, located in the Dalecarlia Pumping Station, which simultaneously supplies water to each of the tanks through 24” and 30” cast iron water mains. Wastewater from the backwash process is recycled to the Dalecarlia Forebay (i.e. the head of the treatment process) via a subsurface Backwash Recovery Pumping Station (BWRPS). The BWRPS operates two centrifugal pumps, which are critical to the Dalecarlia WTP environmental permitting compliance. Both the supply and waste facilities require modifications to restore their infrastructure, improve reliability and address sanitary deficiencies.

Inactive

PreSolicitation Notice Project: Dalecarlia Backwash Water Tanks Improvements Solicitation#: This is a Pre-Solicitation synopsis notice for firm-fixed price (FFP), Construction services for Dalecarlia ... PreSolicitation Notice Project: Dalecarlia Backwash Water Tanks Improvements Solicitation#: This is a Pre-Solicitation synopsis notice for firm-fixed price (FFP), Construction services for Dalecarlia Backwash Water Tanks Improvements at the Washington Aqueduct in Washington, DC. For Information Only: This Synopsis is ONLY A NOTIFICATION that a solicitation is anticipated. All questions regarding this SYNOPSIS must be submitted in writing via email to: Airron.D.Wiggins@usace.army.mil 1. Contract Information: The estimated contract value is $3,600,000.00. 2. Place of Performance: Washington Aqueduct 3901 Donaldson Place, NW Washington, DC 20016 3. Socio-Economic Category: 100% Total Small Business Set-aside 4. The resulting contract is anticipated to be awarded on or about May 1, 2021 and will have a period of performance of approximately 258 calendar days. 5. Evaluation Information: Award will be made to the lowest responsible, responsive bidder. 6. Submission Information: The estimated solicitation issue date for solicitation W912DR21B0008 is on or about March 31, 2020. Bids are anticipated to be due approximately 30 days from issuance of solicitation. The U.S. Army Corps of Engineers, Baltimore District (NAB), has been tasked to solicit for and award construction services for Backwash Water Tanks Improvements at the Washington Aqueduct 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). Total Small Business set-aside and NAICS 237110, size standard of $39.5 million. 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). As part of the water treatment and supply system, the Dalecarlia Water Treatment Plant (WTP) operates dual media filters for water filtration and purification purposes. When the filters are in use, the pressure loss across the media gradually increases and eventually the filter must be cleaned (backwashed) in order to continue functioning within the specified water quality limits. During the filter backwash process, high volumes of water are used to fluidize the filter media and release the trapped solids. At the Dalecarlia WTP, there are two wash water storage tanks known as the Underground Tank and the Elevated Tank, respectively. Wash water is supplied to the wash water storage reservoirs through an altitude valve, located in the Dalecarlia Pumping Station, which simultaneously supplies water to each of the tanks through 24” and 30” cast iron water mains. Wastewater from the backwash process is recycled to the Dalecarlia Forebay via a subsurface Backwash Recovery Pumping Station (BWPRS). The BWPRS operates two centrifugal pumps, which are critical to the Dalecarlia WTP environmental permitting compliance. The project consists of modifying both the supply and waste backwash facilities to restore their infrastructure, improve reliability and address sanitary deficiencies to include: construction of a drain outlet structure, the installation of a subsurface waterproofing membrane, the replacement of tank corrosion protection system, the installation of new electrical switchgears, variable speed drives, transfer switches, etc., the rehabilitation of altitude valves and the replacement of valves, actuators and actuator control systems.