Automatic dry-cleaning machines and filter assemblies shall be installed within either a dike or pan and piping system of adequate capacity to contain the solvent should leakage occur. Some means shall be provided for draining the solvent in the event of a leak. This may be done by gravity flow with the solvent transferred to an emergency holding tank. This tank shall be vented to the outside or to the machine storage tank or exhaust system stack.
('69 Code, § 5-24)