D.C. Mun. Regs. tit. 21, r. 21-603
No artificial fill shall be deposited in any waters shoreward of the bulkhead line unless the Mayor, pursuant to this chapter, issues a permit for the deposit of the artificial fill.
Artificial fill shall be deposited in accordance with the terms of the permit, and within the time set forth in the permit.
The fill shall be confined within a structure sufficient to retain the fill or kept sufficiently shoreward of the bulkhead line to prevent sloughing of fill into the river beyond and riverward of the bulkhead line.
Any sand or gravel spilled or dropped in waters shoreward of the bulkhead line in loading or unloading, if recovered or removed promptly, shall not be subject to this section.
No artificial fill shall be authorized or permitted between the bulkhead line and the pierhead line.
D.C. Mun. Regs. tit. 21, r. 21-603