There are two "off" in the below sentence, are they both adverb? does "off+of" mean "from"? I am trying to find its meaning in longman dictionary, but failed, which explanation can the word "OFF" match?
This is all plastic picked up off of beaches, every single bit of it," said Pozzi, "So we have processed about 18 tons of garbage off of a small area of beach in the last six years. And it could be anywhere in the world. This is a worldwide problem, the plastic pollution issue.
Remark: This sentence comes from ：http://www.51voa.com/VOA_Standard_English/animal-sculptures-national-zoo-plastic-ocean-pollution-70348.html