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2020 STREET AND UTILITY IMPROVEMENT PROJECT FEASIBILITY REPORT CITY OF ST. ANTHONY VILLAGE WSB PROJECT NO. R-011648-000 PAGE 3 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 1950’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. 3.2 Water Main The existing water distribution mains along 32nd Avenue NE and Croft Drive were also installed in the 1950’s and consist of 6-inch cast iron pipe (CIP). This system has had numerous breaks over the past few years and breaks will become more likely as the pipes have exceeded 60 years of service. In addition, the cast iron pipes are likely heavily corroded and possibly leaking. The existing water distribution main along Silver Lake Terrace was installed in 1996 and consist of 4-inch ductile iron pipe (DIP). 3.3 Storm Sewer The existing storm sewer system along 32nd Avenue NE and Croft Drive consists of 12-inch and 15-inch reinforced concrete pipe (RCP) located at the easterly cul-de-sac on 32nd Avenue NE. The existing storm sewer system on 32nd Avenue NE collects runoff from the following areas and conveys stormwater to the existing storm sewer system on Old Highway 8 which eventually outlets to Mirror Lake: Skycroft Drive from 33rd Avenue to 32nd Avenue Croft Drive from 33rd Avenue to 32nd Avenue 32nd Avenue NE from approximately midblock east of Silver Lake Road Rankin Road from 33rd Avenue NE to 32nd Avenue Hillendale Avenue from approximately midblock east of Silver Lake Road The existing storm sewer system along Silver Lake Terrace consists of a shallow storm crossing with a road grate that crossing Silver Lake Terrace south of the road terminus. The drainage outlets to the west and eventually discharges to Silver Lake. 3.4 Streets The proposed reconstruction area consists of 30-foot-wide bituminous streets with curb and gutter, except for Silver Lake Terrace. Silver Lake Terrace consists of a 22-foot-wide bituminous, rural street (no curb and gutter). Soil borings will be completed during final design to determine the underlying soils in the area. Soil borings completed within various locations throughout the City have indicated the underlying soils consist of silty clay fill or sandy clay fill. Given the consistency in the soils throughout the City, the underlying soils are assumed to be similar. 100