（Per DGR 53rd Edition, quantity indication and dry ice quantity indication had been deleted from the Mar ing requirements on sealed overpacks causing an operation problem in the preparation of NOTOC）
Q.
Per 7.1.4.1 second bullet point, 7.1.5.1 (c) [quantity indication] and 7.1.5.1 (d) [indication of dry ice] had been deleted from the Mar ing requirements of a sealed overpack. Whereas in the Note following 7.1.4.2, it says where an overpack contains more than one UN number, the total quantity of dangerous goods should be shown by UN number. Please give us an explanation on how should we Mar a sealed overpack. Furthermore, net quantity of dry ice is operationally necessary to make the NOTOC. How should we advise the shippers to enter dry ice quantity information? (31 Jan 12)
A.
If it is necessary to have quantity information on dry ice to produce the NOTOC, I would suggest you advise such relevant shippers to enter dry ice quantity Mar ings on the surface of a sealed overpack. Suggestion has been made to IATA to consider an amendment to the rules.
As for the Mar ings of other dangerous goods in a sealed overpack, if there is only one UN number in a sealed overpack, there is no need to Mar the quantity. If there are more than one UN number in the sealed overpack, we follow the Note under 7.1.4.2 and we should enter the total quantity of dangerous goods by each UN number.
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