5.1 A means should be provided to seal the sampling
                           equipment throughout the period of supply.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           5.2 Attention should be given to:
                        
                        
                        
                        
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                                 .1 the form of set up of the sampler;
                               
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                                 .2 the form of the primary sample container;
                               
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                                 .3 the cleanliness and dryness of the sampler
                                 and the primary sample container prior to use;
                               
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                                 .4 the setting of the means used to control the
                                 flow to the primary sample container; and
                               
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                                 .5 the method to be used to secure the sample
                                 from tampering or contamination during the bunker operation.
                               
 
                     
                     
                     
                        
                        
                         
                           5.3 The primary sample receiving container should
                           be attached to the sampling equipment and sealed so as to prevent
                           tampering or contamination of the sample throughout the bunker delivery
                           period.