6 Location marking
1 An inspector may give directions to the person in control of a site requiring him to display, at all times when a total quantity of 25 tonnes or more of dangerous substances is present at the site, safety signs at such locations within the site as are specified in the directions.
2 Directions under paragraph (1) may only be given where the inspector is satisfied on reasonable grounds that–
(a) there is or is liable to be present at any one time a total quantity of 25 tonnes or more of dangerous substances at the site, and
(b) the display of safety signs at the locations to be specified in the directions is necessary in order to warn firemen in an emergency that dangerous substances are present at those locations.
3 The safety signs referred to in paragraph (1) shall be warning signs as defined by clause 3.6 of Part 1 of BS 5378 used in conjuction with supplementary signs as defined by clause 3.9 of that Part, and all such signs shall comply with that Part with respect to colours and layout.
4 The warning signs and supplementary signs shall bear the hazard warning symbol and hazard warning text respectively.
5 The hazard warning symbol and hazard warning text shall be–
(a) in the case where there is one dangerous substance or there are two or more dangerous substances with the same classification at the location where the signs are displayed, that specified in column 2 of Schedule 3 appropriate to the classification of such substance or substances specified opposite thereto in column 1 of that Schedule,
(b) in the case where there are two or more dangerous substances with different classifications at the location where the signs are displayed, that specified in the said column 2 opposite the entry for “Mixed hazards” in the said column 1.
6 Directions may be given by an inspector under this regulation in any such reasonable manner as he may think fit, and may be withdrawn by him at any time.
7 The person to whom directions are given under this regulation shall, subject to regulation 10(2), comply with those directions, but safety signs need not be displayed at a location specified in the directions at a time when dangerous substances are not present at that location.
8 Any reference in this regulation to the presence of dangerous substances at a location is a reference to the presence of dangerous substances at or within the vicinity of that location.