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The Department of Defense is procuring parking lot repair services for the Defense Supply Center Richmond (DSCR). Key requirements include a 4-inch open-graded drainage layer, compaction, and a separation layer.
The scope of work includes repairing the parking lot at DSCR B41, involving the installation of a 4-inch open-graded drainage layer, compaction, and a separation layer.
RFI's: 1. Material Specification The required material for the 4" open-graded drainage layer should be a hard, durable, crushed aggregate that meets the gradation for a Rapid Draining Material (RDM) or Open Graded Material (OGM) as specified in UFC 3-250-01, Chapter 20. The material must provide sufficient stability for construction equipment and have a minimum permeability of 1,000 ft/day. 2. Compaction
Requirements This layer must be compacted. Per UFC 3-250-01, Appendix B, compaction of drainage layers is achieved with a specified effort, in this case, six passes of a 10-ton vibratory roller, rather than a final density percentage. This ensures the aggregate is stable without crushing it, which would reduce its permeability. 3. Additional Installation
Requirements Based on UFC 3-250-01, the following additional
requirements apply: Separation Layer: A granular separation layer (minimum 50 CBR) or an approved geotextile fabric must be placed directly beneath the drainage layer to prevent contamination from the subgrade. Placement: The aggregate should be placed to ensure uniform thickness and prevent segregation. It should be placed on the prepared VDOT 21A subbase to a compacted thickness of 4 inches. Protection: The completed drainage layer must be protected from contamination and disturbance. The subsequent pavement layer should be placed as soon as possible. --------------------------------------- Update
30 March 2026: Typos identified. The CORRECT timing for this RFQ is:
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