Award Winning Project

ACEC: National Honor Award 
ACEC Iowa: Grand Conceptor
Water and Wastes Digest: 2015 Top Projects
ASCE Iowa Section:  Outstanding Civil Engineering Project Achievement
ENR Midwest Best Projects:  Award of Merit Water/Environment 

Related Projects Worldwide

Sanitary Sewer at Tulane Research Facility Enlarged to Accommodate Campus Expansion Since its inception in 1964, the Tulane research campus has been expanded several times. During this expansion, the sanitary sewer treatment plant was modified to adjust to new loadings by adding oxidation ponds and a constructed wetlands area. Learn More
EPA Compliance Reached Through Fort Madison CSO Project The U.S. Environmental Protection Agency issued a Consent Order requiring the City of Fort Madison to address combined sewer overflows (CSOs) by either implementing disinfection of CSOs or eliminating them. Learn More
Disinfection Key in Keeping Combined Sewer Overflow Discharge Safe for the Mississippi Contact time between the disinfectant chemical and overflow water is achieved in 1,000 feet of shallow 60-inch pipe rather than a deep concrete tank considered during preliminary design. Learn More
Purifying Wastewater for Reuse Stanley Consultants provided construction management services for the Doha North Sewerage Treatment and Pipeline project, a large and complex wastewater sewer treatment and conveyance system in Doha, Qatar. Learn More
Sewer Separation Improves River Quality, Complies with EPA Standards The benefits of the CSS separation project are far reaching and the water quality in the Mississippi River has improved dramatically. Learn More
Sewerage Improvements Among Largest Design-Build Wastewater Projects Stanley Consultants provided engineering services to rehabilitate all trunk sanitary sewers and five wastewater pumping stations for the City of Suez, Egypt. Learn More
Improving Baton Rouge's Sewer System with New Wastewater Pump Stations Stanley Consultants designed 16 new replacement pump stations for the City of Baton Rouge to resolve city-wide sewer problems and position the City to realize millions of dollars in fiscal savings through a 25-year planning period. Learn More
Major Wastewater Treatment Plant Expansion Stanley Consultants constructed and analyzed a hydraulic model of the City's wastewater trunk sewer system to use in developing a 30-year sanitary sewer master plan. Learn More

Westside Diversion Tunnel = Economic Growth for the Quad Cities

Stanley Consultants was retained by Davenport, Iowa to provide initial studies, environmental assessment, permitting, final design, and construction services a new sewer diversion tunnel.

The Quad City metro area boasts a growing population of nearly 400,000 residents but over the past few years the growth has not taken place equally among the cities of Davenport and Bettendorf, Iowa, and Moline, East Moline and Rock Island, Illinois.  Capacity problems in Davenport's sanitary sewer system have severely limited the City's ability to expand.  The primary issue is sewer surcharge (sewer overflow) during wet weather events.  This surcharge can cause basement backups and overflow to area streams and rivers.

The City of Davenport wanted to alleviate this problem by installing a new section of sanitary sewer tunnel on the northwest corner of the city.  The new tunnel will not only provide relief to the remainder of the City's wastewater collection system, it will also allow for 20 square miles of new development, which in turn will offer a significant growth in tax base with the addition of new residential, commercial and industrial properties. 

Stanley Consultants was retained to provide initial studies, environmental assessment, permitting, final design, and construction services for the sewer diversion tunnel.  Several phases were needed to complete the project, first being the preparation of a Collection System Master Plan.  Conceptual designs and site surveys were also conducted before the final design phase was reached. 

The effects of the project are far reaching.  The project has resolved the sewer problems and indirectly enhanced the City's economic base.  The water environment in the Mississippi River and the habitat for local wildlife, waterfowl, and fish has significantly improved.