48 CFR §1532.805-70

1. (a)EPA Form 1900-3, Assignee's Release, at 1553.232-70 is required to be submitted by the assignee for cost-reimbursement contracts prior to final payment under the contract.
2. (b)EPA Form 1900-4, Assignee's Assignment of Refunds, Rebates, Credits, and Other Amounts, at 1553.232-71 must accompany the assignee's release prior to final payment under cost-reimbursement contracts.
3. (c)EPA Form 1900-5, Contractor's Assignment of Refunds, Rebates and Credits, at 1553.232-72 must be prepared by the Contractor prior to final payment under cost-reimbursement contracts and must accompany the Contractor's Release.
4. (d)EPA Form 1900-6, Contractor's Release, at 1553.232-73 must be submitted by the Contractor prior to final payment under cost-reimbursement contracts.