US Customs Clearing . com
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Dale Dong Young Park, dba A Plus Customs Broker
(Filer Code AEF)

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importing a concrete batch machine with a 100kW diesel engine.  
And to meet EPA regulations importer need a CBP Form 301 bond in the amount of $500 fulfill paragraph 22 of 3520-21
19 CFR 12.74 - Nonroad and stationary engine compliance with Federal antipollution emission requirements.

This is the section of 1309.626 that states the possible forfeit of the posted bond.
Importer is liable for full bond amount ($50,000),    NOTE: minimum bond amount is $50,000, ONLY
40 CFR 1039.625 - What requirements apply under the program for equipment-manufacturer flexibility?