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<br /> <br />Feasibility Report <br />2021 Street and Utility Improvement Project <br />City of St. Anthony Village <br />WSB Project No. 015900-000 PAGE 6 <br />3.2 MILL AND OVERLAY IMPROVEMENTS <br /> <br />Streets within the proposed mill and overlay improvement area are experiencing various severities of <br />distress. <br /> <br />31st Avenue and Croft Drive were originally 30-foot-wide roadways with concrete curb and gutter. <br />Pavement cores taken within 31st Avenue and Croft Drive indicated existing asphalt thickness range from <br />3 inches to 4 inches and aggregate thickness range from 6 inches to 13 inches with a select granular <br />subgrade. Both 31st Avenue and Croft Drive are experiencing delimination from a previously preformed <br />seal coat. Delamination is the separation of the seal coat material from the asphalt pavement. The City <br />has completed patching along both roadways in areas where the delimanation further deteriorated <br />causing larger potholes. Alligator cracking along with moderate to severe transverse cracks were <br />observed throughout. <br /> <br />29th Avenue and St. Anthony Boulevard were constructed as 40-foot-wide and 32-foot-wide collector <br />roadways with concrete curb and gutter, respectively. Pavement cores taken within 29th Avenue and St. <br />Anthony Boulevard indicated existing asphalt thickness ranges from 6.75 inches to 9 inches and <br />aggregate thickness ranges from 8.5 inches to 12 inches with a select granular subgrade. Both roadways <br />were observed to be in good condition with minor cracking. <br /> <br />3.3 CHANDLER DRIVE AND FOSS ROAD SANITARY SEWER IMPROVEMENTS <br /> <br />In preparation for the final developemet of the Silver Lake Village Area, the existing sanitary sewer <br />systems near Silver Lake Road and 39th Avenue were reviewed. The development will be located within <br />the north service area of the City’s sanitary sewer system and the flow generate will be metered by the <br />Metropolitan Council Environmental Servies (MCES) M055 metershed. <br /> <br />The existing Foss Road Lift Station currently serves the entire MCES M055 metershed. A drawdown test <br />was performed in July 2020 to determine the pumping rate consistency for each pump. The flow rates <br />shown below represent the average flow rates calculated for the three drawdown tests performed on each <br />pump. <br /> <br />• Pump No. 1: 1,014 gallons per minute <br />• Pump No. 2: 1,467 gallons per minute <br /> <br />In addition, the sanitary sewer pipe system was reviewed for capacity in preparation for the development. <br />Modeling of the downstream system identified one segment along Chandler Drive that does not provide <br />the necessary capacity to support the full development. <br /> <br /> <br />43