City of Wakefield Challenge Faced with infrastructure that could no longer meet city needs, the City of Wakefield retained STS to design and implement a three-phased approach for the development of modern infrastructure systems. From 1993 to 1995, STS conducted the manhole inspections, smoke testing, televising, flow monitoring and prepared study reports for the City of Wakefield. This activity led to a preliminary engineering report for a three-phase project that includes the total reworking of the city’s sanitary and storm sewer collection systems. STS completed design plans and construction inspection services for Phase I and II of this expanded project. Phase II design and bidding took place in 1999 and was completed in summer of 2002, nearly three months ahead of schedule. This phase included a major reconstruction of the Wakefield urban area, which will result in an estimated elimination of 750,000 gallons per day of inflow and infiltration. Solution Phase II additions include three pump stations, including a large cast-in-place tri-plex pump station with variable speed pumps. The project implemented numerous alternatives that allowed the city to select options based on cost and available budget. In all, more than 15 miles of new storm, sanitary and water main piping were installed. City streets were also reconstructed with sub-base, paving, curbs and sidewalks. Although initial funding was limited, additional funds were obtained as needed to award the project. A construction contingency balance of less than three percent was available going into construction of this $7.2 million project. Thanks to a quality set of design plans and specifications and attuned project inspectors, the project did not experience scope creep and was completed within budget. Key Benefits The project was completed successfully and within budget at every phase. STS used state-of-the-art Eagle Point software to allow designers to verify flow capacities and easily make design revisions. This was critical due to the flatness of the collection area and concerns of high groundwater and poor soil conditions. The software allowed the design to be easily tweaked to minimum slopes. The accuracy of the design was confirmed during construction and minimal changes were encountered.