building site
cement
concrete
construction
cover
day
dirt
dirtiness
dirty
ditch
drain
drainage
ecology
environment
floor
flowing
footpath
ground
grunge
hole
industry
labor
manhole
masonry
natural
object
physical
pipe
pollutant
polluted
pollution
resource
road
rough
sanitary
sewage
sewer
sewerage
surface
system
unclean
under
unfinished
waste
waste water
water