5 CFR §890.1009

1. (a)Contesting the debarment. Within 30 days after receiving OPM's notice of proposed mandatory debarment, a provider may submit information, documents, and written arguments in opposition to the proposed debarment. OPM's notice shall contain specific information about where and how to submit this material. If a timely contest is not filed, the proposed debarment shall become effective as stated in the notice, without further action by OPM.
2. (b)Requesting a reduction of the debarment period. If OPM proposes a mandatory debarment for a period longer than the 3-year minimum required by 5 U.S.C. 8902a(g)(3), the provider may request a reduction of the debarment period to not less than 3 years, without contesting the debarment itself.
3. (c)Personal appearance before the debarring official. In addition to providing written material, the provider may appear before the debarring official personally or through a representative to present oral arguments in support of his contest. OPM's notice shall contain specific information about arranging an in-person presentation.