Workers used a vacuum truck to remove weeds that had sprouted on the green roof that covers City Hall in Mukilteo, Wash. Subcontractors mistakenly added mulch full of weeds, which took over sedum on the roof. "We didn't get what we paid for," Public Works Director Larry Waters said. "Half of it looks green, it's just not a real green roof. It's a Charlie Brown weed patch."

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