D.C. Mun. Regs. r. 27-3706
After execution of a settlement agreement in accordance with § 3703, the contractor shall submit a voucher or invoice showing the amount agreed upon less any portion previously paid. The contracting officer shall attach a copy of the settlement agreement to the voucher or invoice and forward the document to the appropriate office for payment.
If the settlement is by determination under § 3705, payment shall be effected in the following manner:
In the case of construction contracts, before forwarding the final payment voucher, the contracting officer shall ascertain whether there are any outstanding labor violations. If any violations are outstanding, the contracting officer shall determine the amount to be withheld from the final payment.
The District shall not pay interest on the amount due under a settlement agreement or a settlement by determination. However, the District shall pay interest on amounts found due to a contractor on claims in accordance with § 806 of the Act from the date the Director receives the claim.
The total amount payable to the contractor under a settlement, before deducting disposal or other credits, exclusive of settlement costs, shall not exceed the contract price less payments otherwise made or to be made under the contract.
D.C. Mun. Regs. r. 27-3706