(Amended by Ord. No. 162647; Jan. 4,1990.)  The Bureau, whenever deemed necessary to insure compliance with this Chapter, may require any operator subject thereto to deposit with it such security in the form of cash, bond, or other security as the Bureau may determine.  The amount of the security shall be fixed by the Bureau but shall not be greater than twice the operator’s estimated average quarterly liability for the period for which he files returns, determined in such manner as the Bureau deems proper.  The amount of the security may be increased or decreased by the Bureau subject to the limitation herein provided.