Projects Selected Experience In Wastewater Projects Wastewater Treatment Plant Yachats, Oregon Design, bidding and construction administration for an upgrade to the city's wastewater treatment facility. The project includes a new SBR Wastewater Treatment Plant, four replacement wastewater pump stations, and 1,100 feet of force main. Construction is underway and should be completed in 2008. The City of Yachats' new wastewater pump stations include submersible pumps and are summarized below: • Main Pump Station: Number of Pumps: 3 - Capacity of Pump Station: 1800 gpm • Park Pump Station: Number of Pumps: 2 - Capacity of Pump Station: 400 gpm • Riverside Pump Station: Number of Pumps: 2 - Capacity of Pump Station: 590 gpm • Pontiac Pump Station: Number of Pumps: 2 - Capacity of Pump Station: 150 gpm Ocean Hills Pump Station Waldport, Oregon This project, completed in January 2007, included a preliminary engineering report, design and bidding documents and construction management for a new wastewater pump station and wastewater treatment plant headworks upgrade. Ocean Hills Pump Station utilizes two 470 gpm submersible pumps with an aboveground piping gallery. A new building was constructed to house a standby generator and hydrogen sulfide control system. The pump station upgrades also included the installation of a 14,700 foot force main. Wastewater Treatment Plant Bandon Dunes Resort, Bandon, Oregon As the first flat membrane system installation in the United States, this plant was designed and constructed to replace the existing aerated lagoon and wetland system. The membrane bioreactor (MBR) process technology is capable of consistently producing an effluent with less than 1 mg/L BOD, 1 mg/L TSS and 5 mg/L nitrate. New plant improvements included construction of an MBR basin, chlorine contact chamber, conversion of the aerated lagoons to a facultative sludge lagoon (FSL), and a new control building. Plant capacity is 125,000 gpd. Wastewater Treatment Plant Siletz, Oregon With the first flow-through sequencing batch reactor (SBR) installation in the State of Oregon, Siletz is the only municipality allowed to discharge to the pristine Siletz River. This plant serves a community of 1,100 people. This project consisted of design and construction-period services for construction of a new SBR system to replace the existing lagoon system. Additional facilities included a headworks, surge overflow basin, ultraviolet disinfection, aerobic digesters, facultative sludge lagoon and control building. Solar Sludge Drying Bed Rogue River, Oregon This project, completed in May 2002, included the design and installation of a solar sludge drying bed, drum thickener, solids storage tank, and transfer pump. The solar sludge drying bed consists of a greenhouse facility with microprocessor- controlled ventilation louvers and fans, and a "mole". The mole is an electronically controlled device that tills the sludge bed bringing moist sludge to the drying surface. The City utilizes this facility to process sludge, collected in its facultative sludge lagoon (FSL), into a dry, granular end product for land application. Three Rivers Casino Wastewater Improvements Florence, Oregon The design/build process was used to create a flat membrane treatment system that will serve the new Three Rivers Casino Complex located in Florence, Oregon. The project was completed in 2007. The overall project included waste-activated sludge holding tank, drain pump station, biosolids handling, headworks with mechanical bar screen and screenings wash down station, membrane bioreactor tank system, drain pump station, non-potable water pump station and control building. Wastewater Treatment Plant Spirit Mountain Casino Design and construction administration of an upgrade for Spirit Mt. Casino's wastewater treatment plant. The project added a sequencing batch reactor in parallel with the existing system and increased total plant hydraulic capacity to 0.43 mgd. The installation of a 3.5-acre spray irrigation system allowed for disposal of 120,000 gallons per day of treated effluent and required a medium-pressure ultraviolet disinfection system capable of meeting total coliform requirements for a Class IV spray irrigation system. Wastewater System Improvements Charleston Sanitary District South Slough crossing improvements consisted of the installation of approximately 1,375 lineal feet of 10-inch HDPE force main under the South Slough using horizontal directional drilling construction methods, connection of a new force main discharge to existing manhole, and cementitious lining system for new manhole sections. Pump station improvements consisted of the retrofit of two existing wet pit/dry pit pump stations with two submersible pumping units, variable frequency drives, SCADA systems, and controls, and installation of valves, vaults, replacement of wet well sections and pump discharge piping.