Marginal note:Assessment of efficacy
(5) The assessment of efficacy under paragraph (4)(a) must be carried out using oil obtained directly from the operations site where the spill-treating agent is being considered for use or, if oil is not available from that operations site, it must be carried out using an oil that most closely resembles the oil that is expected to be obtained from the operations site and must be repeated when oil becomes available from that operations site.