D.C. Mun. Regs. tit. 27, § 2606
2606.1 Because of potential labor and administrative problems, cost-plus-fixed-fee, price-incentive, or other types of contracts with cost variation or cost adjustment features shall not be permitted concurrently at the same work site with firm-fixed-price, lump-sum, or unit-price contracts without the prior written approval of the Director.
SOURCE: Final Rulemaking published at 35 DCR 1582 (February 26, 1988).