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2018 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. 010507-000 PAGE 4 3. EXISTING CONDITIONS 3.1 Sanitary Sewer The sanitary sewer system in the project area consists of 9-inch-diameter vitrified clay pipe (VCP) installed in the early 1960’s. The joint sealing material in use at that time was typically an oakum and bituminous material. An internal inspection, with a specially designed television camera, will be completed with final design to determine the structural condition of the existing pipe and individual services. Internal inspections of the sanitary sewer system within the proposed project area were completed erlier this year. The inspection found the structural condition of the pipe to vary between fair and poor, with numerous offset joints, cracked segments, dips with solids deposition, and some root intrusion and mineral deposits at joints. 3.2 Water Main The existing water distribution mains in the project area were also installed in the early 1960’s and consist of 6-inch cast iron pipe (CIP) main line along Macalaster Drive and Foss Road, and Highcrest Road. This system has had numerous breaks over the past few years and breaks will become more likely as the pipes have exceeded 50 years of service. In addition, the cast iron pipes are likely heavily corroded and possibly leaking. 3.3 Storm Sewer The existing storm sewer system in the project area consists of 15-inch reinforced concrete pipe (RCP) along Foss Road from 37th Avenue to Chandler Drive, 36-inch RCP along Highcrest Road from 37th Avenue to the dead end, and no storm sewer system along Macalaster Drive. The existing storm sewer system on Foss Road collects runoff from Foss Road only and conveys stormwater to the existing storm sewer system on Chandler Drive. In addition to collecting runoff from Highcrest Road, the existing storm sewer along Higcrest Road conveys stormwater collected from other areas in the city to Mirror Lake. 3.4 Streets The proposed reconstruction area consists of 24-32 foot-wide concrete streets with curb and gutter. Soil borings will be completed during final design to determine the underlying soils in the area. Soil borings completed with the 2009 Street and Utility Improvements project on nearby Chandler Drive indicated the underlying soils consist of silty clay fill or sandy clay fill. Given the the close proximity of the roads reconstructed in 2009, the underlying soils are assumed to be similar. 30