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Country Haven Pump Station, Hillsboro, OR
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 This project was a pump station rejuvenation that included designing replacements for two existing submersible pumps in a wet well. As part of the project, two new manholes were designed over existing influent sewers and a valve bypass connection in the existing valve vault was designed. NW Engineers conducted force main hydraulics calculations and pump analysis and selection. The client (Clean Water Services) was provided with options on pipe materials, fittings, joints, and other appurtenances. Engineering plans and construction specifications were generated based on final input from the client
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Rockaway Beach Pump Station, Rockaway Beach, OR
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 At the Rockaway Beach wastewater treatment plant we designed new effluent pump station to pump plant effluent through the new ocean outfall. We designed the horizontal centrifugal pumps and the land portion of the force main connecting to the ocean outfall. The design required addressing the low head conditions and included the design on special valves to allow the pumps to operate efficiently. A new concrete wetwell was designed inside of the existing plant building. Also included was designing the replacement pumps for the vacuum-primed trickling filter effluent pumps which pumped into the activated sludge basin. We assisted in the bidding process and provided periodic inspection services for the pump stations. We also wrote the operation and maintenance manual for the pump stations.
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Hawn Creek Pump Station, Carlton, OR
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 The project included a determination of the 20-year flow projection to meet DEQ requirements. The existing station utilized self priming pumps in a small building. The new design included two submersible pumps installed in the existing wetwell. Pump Station firm capacity was 1,175 gpm utilizing 60 HP pumps. A new control panel, new valve vault, and emergency electric generator with automatic transfer switch were also included in the project. Our services included assisting in receiving construction bids, reviewing all submittals, monitoring the construction process, and preparing the operation and maintenance manual for the pump station.
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Cutler City Pump Station, Lincoln City, OR
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 Our design included new submersible pumps located in the wetwell (retrofitted the existing wastewater wetwell and constructed a new wetwell for the stormwater station), and the electrical controls located in a new control building. The building was designed to fit in architecturally with the surrounding residential area. The wastewater station includes two pumps and the stormwater station includes three pumps. New valve vaults were designed for each station. Each station connects to its existing force main leading away from the site. An emergency generator is located in a separate room next to the control panel room. This generator is sized so that both pump stations can operate at full capacity in the event that normal electrical power to the station is interrupted.
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SW 27th Street Sanitary Main
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.jpg "DSCN0032 (Small).jpg") As part of an upgrade of SW 27th Street from “Local Street” to “Minor Arterial” roadway classification, NW Engineers provided design services for 2.1-mile roadway and sanitary sewer design. Creative design included careful selection of a practical and cost-efficient vertical and horizontal alignment. NW Engineers design team carefully analyzed and weighed the advantages and disadvantages of related issues such as elevations, slopes of connecting streets and driveways, depths of existing and proposed utilities, surface drainage patterns, amounts of cut and fill, and proposed retaining wall heights. Sanitary sewer service laterals were coordinated with individual property owners’ septic tanks.
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SW Killary Lane, Tualatin OR
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.jpg "IM007358 (Small).jpg") This project included the design of new sanitary sewers to serve an area in Tualatin currently on septic tanks. The project required the review of options to serve the area with sanitary sewers and determining which one was the most cost-effective. The design required a critical review of storm sewer elevations to be sure there would be no conflict with the new sanitary sewer. Meetings with all property owners were held at their house to determine where the new service line would tie into their existing septic system. All septic tanks will be decommissioned and properly taken out of service as part of the project. In addition the water mains in this area will be replaced with new water mains, all services to the meter replaced.
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Astoria-CSO Partial Sparation
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.jpg "Astoria-watershed-5-10-07-0 (Small).jpg") The city has experienced overflows from combined sewer system, and is under DEQ order to limits the overflows. The project designed approximately 20,000 feet of new storm drain system and 1,400 feet of sanitary sewer, including sections of new pipe, existing pipe, open channels, outfall modifications and pond routing in existing neighborhoods. After confirmation of design by City and the City's program manager, full survey, and final design, specification and construction documents are prepared for public bid. Project funded with Oregon State wastewater revolving loan fund monies, administered through Oregon DEQ. Fee of $200,000 dollars and an approximate construction cost of $2,000,000.
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West Linn Sanitary Master Plan
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.jpg "MP-drop-shadow (Small).jpg") This project required that all of the sanitary sewers in West Linn be surveyed. Planning data was utilized to predict future flow rates due to growth, and a model was created to estimate the effects of these future flows on the system. Recommendations were made for sewers which required to be increased in size due to this growth. In addition, sewers serving older areas of town were recommended to be systematically replaced because of their age and to reduce infiltration/inflow entering the sewers from these older mains. Pumping stations were also reviewed and recommendations for upgrades were made. A Capital Improvement Program was prepared which scheduled all recommended improvements.
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