D.C. Mun. Regs. tit. 8-B, § 3213
3213.1 Solicitation mailing lists shall be used to promote competition commensurate with the dollar value of the proposed contract.
3213.2 The fact that less than an entire mailing list is used shall not preclude furnishing of bid sets to other prospective bidders, upon request, or consideration of bids received from bidders to whom the IFB was not mailed or delivered.
3213.3 If the number of bidders on a mailing list is excessive in relation to a specific procurement, the list may be reduced by either of the following methods :
(a) Rotation of lists or using a different portion of a list for separate procurements; or
(b) Using pre-solicitation notices instead of initially forwarding complete bid sets.
SOURCE: Final Rulemaking published at 39 DCR 2566 (April 10, 1992).