50.5—Liability for the tax.
               		
               	 	
               	 	
               	 	               	 	               	 	               	 	               	 	
               	 	
    
         Liability for tax attaches to any person engaged at any time during the taxable year in hydraulic mining in the area identified in paragraph (a) of  § 50.2, if the debris from such mining operations is in whole or in part restrained by any of the debris dams or works constructed by the California Debris Commission.