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Feasibility Report <br />2024 / 2025 Street Reconstruction and Municipal Sewer and Water Extension Project Colonial Woods City of Lino Lakes, MN WSB Project No. 023620-000 Page 4 3.3. Utilities 3.3.1. Sanitary Sewer The properties along Red Maple Lane and 62nd Street east of West Shadow Lake Drive are <br />served by onsite septic systems. Some of the septic systems are drain fields while others are <br />mound systems. There is an existing 8-inch diameter PVC sanitary sewer mainline near the <br />intersection of 62nd Street and West Shadow Lake Drive, with the as-built dated 2004. Existing <br />septic systems have an average age of 35 years. There are 4 of the 29 systems that have been <br />replaced within the last 10 years. The majority of septic systems appear to be installed at the <br />same time the home was constructed. Septic systems installed around this time typically have a <br />35 to 40 year lifespan. 3.3.2. Watermain The Red Maple Lane and 62nd Street properties east of West Shadow Lake Drive are served by <br />private wells. There is an existing 12-inch diameter DIP watermain near the intersection of 62nd Street and West Shadow Lake Drive, with the as-built dated 2004. Existing wells are typically <br />between 91 to 142 feet deep. Wells were installed at the time these houses were built. Wells <br />have an average life span of 50 years. DRAF <br />T <br />233