After sitting abandoned for three decades, the house at 347 11th Street in Park Slope was finally bought from the city for $1 million in July 2005. In recent weeks, the new owners have started the process of turning the house into a four-unit building. After filling up two gigantic dumpsters, it came time on Tuesday to haul them away. One resident across the street watched in horror as the carting company (Inter-Regional Disposal & Recycling, 800-467-7775) “repeatedly rammed” one of the dumpsters into the large tree in front of the house. “They may not have killed the tree but they have definitely done significant damage,” writes our tipster. “I called the parks department and 311 but all they did was let me whine for a while and issued complaint number.” Any suggestions for how to follow this up? GMAP P*Shark