D.C. Mun. Regs. tit. 27, § 3351
3351.1 The contracting officer shall not allow contingency costs except in the case of a termination.
3351.2 A contingency factor may be allowed in connection with a termination when it is applicable to a past period to give recognition to minor unsettled factors in the interest of expediting settlement.
SOURCE: Final Rulemaking published at 35 DCR 1675 (February 26, 1988).