how to read COI from a contractor

[Courtney Nguyen]

Hi all,

I have 4 rentals that need tree trimmings.  I have reached out to 2-3 contractors for estimates and also asked them to provide COI.  One of them sent theirs with the following info:

Under Description of Operations/Locations/Vehicles:
Blanket Additional Insured/Blanket Waiver of Subrogation/Blanket Primary and Noncontributory/Blanket Per Project Aggregate.

What does the above mean?

They do have GL at 1 mill, but no WC.  Are we ok with this?

They listed me as Certificate Holder.  Are we ok with this, or we really need to be addtional insured?

Any feedback is greatly appreciated!