Description:   To assist the Pine Bluff Wastewater Utility in improving the three largest lift stations in the Pine Bluff Wastewater Collection System, Crist Engineers planned and designed new mechanically raked influent bar screens, screenings transporters and screenings disposal systems for installation in the Kansas Street, "Chicken House", and Bush Street Lift Stations. The Kansas Street and Bush Street Lift Stations were equipped with bar screens when constructed, but the screening mechanisms had corroded from sewer gases to render them inoperable. The "Chicken House" Lift Station had not been constructed with a mechanically raked bar screen, but utilized a coarse, manually raked screen, which required Wastewater Utility personnel to enter the wetwell to remove accumulated screenings.   The improvements at each lift station include a new multiple rake mechanically cleaned bar screen constructed entirely of grade 316 stainless steel, discharging to a sealed hopper which is evacuated by a shaftless spiral auger transporter discharging into a polyethlyene bagging system. The bar screen mechanism, hopper, transporter auger and bagging system are all fully enclosed by stainless steel or lexan plastic panels, to prevent release of screenings odors to the atmosphere, to reduce odor levels in the vicinity of each lift station. At the "Chicken House" Lift Station, a new screen chamber was designed to be constructed adjacent to the existing lift station. The new screen chamber houses the new mechanically raked bar screen and a new standby hand raked bar screen. The new screen chamber  required relocating existing 18" and 12" sewer mains, and a 10" force main.