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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 p roperties along Red Maple Lane and 62nd Street east of West Shadow Lake Drive are 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 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 private wells. There is an existing 12-inch diameter DIP watermain near the intersection of 62nd Stre et 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. <br />303