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Building a legacy – your legacy. 701 Xenia Avenue South <br /> Suite 300 <br /> Minneapolis, MN 55416 <br /> Tel: 763-541-4800 <br /> Fax: 763-541-1700 <br /> <br />Attachment 2 <br />Memorandum <br /> <br />To: Michael Grochala, AICP <br /> Community Development Director <br /> City of Lino Lakes, MN <br /> <br />From: Diane Hankee, PE <br /> WSB & Associates, Inc. <br /> <br /> Erin Heydinger <br /> WSB & Associates, Inc. <br /> <br />Date: April 5, 2016 <br /> <br />Re: Mattamy Homes Watermain Review <br /> WSB Project No. 2029-82 <br /> <br /> <br />The proposed municipal water system expansion to serve the Mattamy Homes development is sufficient <br />and should be installed as recommended below. The Mattamy development is located west of I-35E <br />between Main Street and the extension of 77th Street E. <br /> <br />The Mattamy Homes development was modeled based on the addition of 871 new users. The model <br />determined watermain sizes and available fire flow. The Mattamy water system should include: <br /> <br />• 16” main routed through the development. Extended from south to north, and east to west <br />• 12” main to loop through the townhome area <br />• 8” lateral mains throughout <br />• Interconnect with the City of Centerville <br /> <br />The model shows that fire flow is sufficient for the single-family residential area of the development, <br />with calculated available fire-flow ranging from 1,450 to 3,100 gpm. The available fire flow for the <br />townhome area was 2,000 to 2,700 gpm. The developer has yet to determine the required fire flow <br />based on the size of the units and the materials to be used for construction. It should be verified that <br />this range of fire flows is sufficient to serve the townhome area. <br /> <br />The Model results conclude that the existing water system can adequately support the Mattamy homes <br />development. However, as there will be additional development elsewhere within the City, additional <br />supply and storage will be required. Options for increasing the City’s water supply capacity include <br />constructing a new ground storage reservoir (GSR) and drilling an additional well. This is also outlined in <br />the City’s 2030 Comprehensive Plan. Detailed modeling results can be found in Appendix A of this <br />memorandum; system-wide development capacity can be found in Appendix B. <br /> <br />Equal Opportunity Employer <br /> wsbeng.com K:\02029-820\Admin\Docs\Water System\MEMO m_grochala Mattamy Water 040516.docx