Sewer History Exhibit A traveling exhibit on the history of sewage conveyance systems from 3500 B.C. through the 1930s is part of Utility Construction EXPO ’09 on March 4-6 at the Phoenix (Ariz.) Convention Center Exhibit Hall. The photos and artifacts of Jon Schladweiler, historian of the Arizona Water & Pollution Control Association, offer insight into the origins of modern sewer systems and bring to light the contributions of sewer builders, engineers and operators. Visit www.sewerhistory.org.Cooperative EffortThe Kansas Water Environment Association reports that the Mutual Aid Program for utilities is finalized. It coordinates assistance between neighboring utilities in large-scale emergencies
