.—(1) This paragraph applies to— (a) any existing terminal loading petrol onto road tankers, rail tankers or vessels where the through-put is greater than 10 000 tonnes/year, (b) any new terminal unless— (i) the new terminal is located on a small, remote island, and (ii) the actual or intended throughput in a twelve-month period is less than 5000 tonnes. (2) Where this paragraph applies, SEPA must ensure that authorisations include such conditions as it considers appropriate to ensure that the requirements of sub-paragraphs (3) to (11) are met. (3) Subject to the exceptions in sub-paragraph (4), displacement vapours from the mobile container being loaded must be returned through a vapour-tight connection line to a vapour recovery unit for regeneration at the terminal. (4) The exceptions are— (a) the requirement in sub-paragraph (3) does not apply to top-loading tankers where that loading system is permitted, (b) at terminals which load petrol onto vessels, a vapour incineration unit may be substituted for a vapour recovery unit if vapour recovery is unsafe or technically impossible because of the volume of return vapour, provided that atmospheric emissions requirements in respect of vapour recovery units are applied to the vapour incineration unit, and (c) at terminals with a throughput of less than 25,000 tonnes/year, intermediate storage of vapours may be substituted for immediate vapour recovery at the terminal. (5) The mean concentration of vapours in the exhaust from the vapour recovery unit, 3 corrected for dilution during treatment, must not exceed 35 g/normal cubic metre (Nm ) for any one hour. (6) The monitoring and analysis of the mean concentration of vapours in the exhaust from the vapour recovery unit must satisfy the following requirements— (a) measurements must be made over the course of one full working day (seven hours minimum) of normal throughput, (b) measurements may be continuous or discontinuous, but if discontinuous measurements are employed, at least four measurements per hour must be made, (c) the overall measurement error due to the equipment used, the calibration gas and the procedure used must not exceed 10% of the measured value, (d) the equipment used must be capable of measuring concentrations at least as low as 3 3g...