contamination pumping station sewage waste water quality junk junkyard metal scarp drop red sign trash building city economy environment house paper pollution window Bin box can carton dump litter pavement street cutout isolated litterbox planks recycle trashcan wooden biodegradably-slow cheap chemical discardable disposable empty environmentally-unfriendly EPS expanded-polystyrene-foam foamed food-plate hazardous-waste inexpensive insulating lightweight low-cost monomer-styrene plastic plate pollutant polystyrene PS substance synthetic-hydrocarbon-polymer toxic-waste unused widely-used area garbage rubbish scarpheap site