Cambridge Commissioner of the Department of Public Works Owen O'Riordan explained the history of Cambridge's storm water policy and of the the sewer separation project, an expensive undertaking by the municipality, Mass Water Resources Authority (MWRA) and private engineering and construction companies designed to reduce the amount of untreated sewage that escapes to our waterways during heavy storms. He also showed slides of local climate change projections and explained how the city would implement measures of civil defense and adaptation conservation in order to meet the challenges of sea level rise and possible storm surges in the region of the Mystic River watershed and Charles River watershed. He answered questions related to growing pollution and continuous city water quality testing, which is necessary to protect our neighborhoods and wildlife. Youth deliberated his presentation throughout the summer's 6 week camp.