Ike slammed Galveston on Sept. 13, 2008, swamping parts of the city and damaging or destroying stretches of property.
The Galveston County Daily News reported Monday that so far crews have removed more than 12,000 dead trees.
City spokeswoman Alicia Cahill says contractors using vacuum trucks are nearly finished cleaning almost 40 miles of storm drains. Galveston will use the sand and silt to elevate the city's recycling center.
FEMA will reevaluate in June if the deadline needs to be extended again.