Storage Tank Systems for Petroleum Products and Allied Petroleum Products Regulations

35 (1) If the owner or operator of a storage tank system uses an oil-water separator in the operation of the system, the operator must

• (a) each month, measure, as close to the baffle as possible, the thickness of the free oil layer and the separated solids layer and keep a record of those measurements with the date of measurement; or

• (b) use an oil-water separator that is electronically monitored.

(2) If the owner or operator becomes aware of a leak in the storage tank system or a release in liquid form in the environment, they must, without delay, measure the thickness of the free oil layer and the separated solids layer in the oil-water separator and keep a record of that measurement.