N.Y.C. Admin. Code § 11-2706: § 11-2706 Presumption and burden of proof.

For the purpose of the proper administration of this chapter and to prevent evasion of the annual vault charge hereby imposed, it shall be presumed, except where the depth of a vault exceeds twelve feet, that the size of the vault as indicated upon the license therefor originally issued by the borough president up to and including December thirty-first, nineteen hundred sixty-two, and the commissioner of transportation thereafter is a proper measure of the charge until the contrary is established, and the burden of proving that the size of the vault is not accurately stated upon the license shall be upon the person so claiming. In cases where no license of record has been issued for a vault or where the depth of a vault exceeds twelve feet, the burden of proving the actual size of the vault shall be upon the person liable for the vault charge.