The IFR introduced the concept of CDC residues as applied to ammonium nitrate, defining it as the amount that remained onboard after the vessel discharges all saleable cargo. Vessels carrying CDC residue ammonium nitrate were exempt from the NOA requirements. All other CDC carrying vessels after being off-loaded continued to have the NOA requirement. The Coast Guard’s Chemical Transportation Advisory Committee (CTAC) noted that many of the CDC provided a low enough security risk when in residue quantities that they should also be treated as CDC residue.
In this final rule the Coast Guard expands the concept of CDC residues to all of the CDC except:
• Anhydrous ammonia:For all other CDC’s “the cargo that remains onboard in a cargo system after discharge that is not accessible through normal transfer procedures” is considered CDC residue and is exempt from the NOA requirements
• Chlorine;
• Ethane;
• Ethylene oxide;
• Methane (LNG);
• Methyl bromide;
• Sulfur dioxide; and
• Vinyl chloride
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