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The Savannah River Remediation, LLC, a prime contractor at the Department of Energy’s Savannah River Site in Aiken, South Carolina, seeks qualified, interested vendors that offer services for a Concre... The Savannah River Remediation, LLC, a prime contractor at the Department of Energy’s Savannah River Site in Aiken, South Carolina, seeks qualified, interested vendors that offer services for a Concrete and Structural design Subject Matter Expert (SME) to assist with resolution of issues related to concrete mix design, placement methodology and structural requirements for several Saltstone Disposal Units (SDUs). Organization and Experience Demonstrate that your firm has sufficient resources and credentials to assist the Saltstone Disposal Units (SDU) program engineering team to resolve concrete and structural related issues that may arise during construction of the SDU’s. The SME will be relied upon to identify or recommend resolutions for implementation by the SDU team. Recommendations by the SME will be based upon analysis, experience, references and documented via reports. Presentations may be required on a case by case bases. Desirable credentials are fellowships in the American Concrete Institute (ACI), American Society of Civil Engineers (ASCE) and Structural Engineering Institute (SEI). Provide published papers on concrete performance and structures. Background The Saltstone Disposal Units (SDU) program consists of seven 32 million gallons storage units that are being built at Savannah River Site (SRS) to provide permanent landfill disposal capacity for Low Level Liquid Waste (LLW) currently stored in numerous underground tanks at the SRS Tank Farm Facilities. Of the seven units, two are complete, two are under construction and three are scheduled for future construction. The SDUs are designed and built in accordance with the American Concrete Institute (ACI-350) Standard and the American Water Works Association (AWWA D110) Standard. The concrete mix utilized for the SDU is a quarternary mix design that includes Type V Cement, slag, fly ash and silica fume. This mix was tested in accordance with applicable American Society of Testing and Materials (ASTMs) to ensure that its physical characteristics meet the tanks structural and chemical resistance requirements. Each SDU concrete floor slab sits on a dual layer mud mat and covers over 2.5 acres of land. The mud mat is a composite of an upper 6-inch and a lower 4-inch thick concrete slabs. Integrated between the upper and lower mud mats is a 100-mil High-Density Polyethylene (HDPE) membrane designed to contain leaks and instrumented to detect and alert the presence of leaks if needed. Every SDU structure is 375 feet in diameter, 43 feet high enclosed circular structure made from over 16,000 cubic yards of reinforced concrete and consists of a 2-foot thick floor slab, 25 individual walls, and 208 interior 2-foot diameter columns that support a 1-foot thick roof. The SDU floor is cast in 14 individual sections with waterstops between each section. To minimize/eliminate cracks, each section is placed sequentially, within 14 days between placements and water cured for 12 days. Each 43-foot-tall wall is tapered from 24-inches thick at the bottom to 12-inches thick at the top. The walls are prestressed in both the vertical and horizontal direction and have internal seismic cables to make the overall design extremely robust and able to withstand hydrostatic loading from future LLW liquid grout storage, thermal affects from temperature extremes, and potential earthquakes. The horizontal prestressing consists of 346 miles of 3/8-inch galvanized strand wire applied with an average force of 15 kips. Application of strand wrapping utilizes a specialty strand wrapping machine designed for this purpose. The stranded cables are protected from the environment with multiple layers of concrete which is sprayed on (Shotcrete) using the same specialty machine. The vertical prestressing post- tensioning rods connect the walls to the concrete floor foundation and counteracts the bending stress from the circumferential pre-stressing. Each wall is vertically post-tensioned with 17 threadbars to about 174 kips each. The SDUs are fully lined on the inside with a 1/8” thick Bromobutyl rubber liner. The SDU roof is cast in seven individual sections also with waterstops between each section. To minimize/eliminate cracks, each section is placed sequentially, within 14 days (21 days if the roof placement begins at the center location), and water cured for 12 days. Designed into the roof placement are embedded metal plates and penetrations required to provide the infrastructure needed to install Balance of Plant piping, equipment, and appurtenances. Service Capability (Equipment, Personnel, and Facilities) Provide documentation to indicate that your firm has the capability, equipment, personnel resources, and facilities necessary to perform the work scope. Of interest to SRR will be the firm’s overview of services via an onsite or Microsoft Teams presentation and an experience list with a brief overview of the issue and resolution method for each item listed. Point of Contact All questions should be directed via email to Richard Wright at Richard.Wright@srs.gov by April 21, 2021. Responses to the submitted questions are found in the attached "Questions and Answers" document. All submissions should also be directed to Richard Wright at Richard.Wright@srs.gov. Information Requested -Provide documentation to indicate your firm/team’s technical capability to perform the work scope. -Demonstrate your firm/team’s past experience. -Provide published papers on concrete performance and structures. Other Information Procurement Reference Documents such as standard terms and condition, standard representations and certifications, subcontractor safety program guidance, and other forms are located at the Savannah River Site web address: http://www.srremediation.com/business.html.