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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 /> <br />APPENDIX A – WATER MODELING RESULTS: MINIMUM PRESSURES (psi) <br /> <br />Explanation <br />Two demand scenarios were evaluated: <br />1. The existing system with the Mattamy development; and <br />2. The existing system with the Mattamy development and additional development in the <br />northeast area of the City. <br />Demands were estimated using land-use data from the City’s 2030 Comprehensive Plan. <br /> <br />For each scenario, system additions were made. The system layouts evaluated were as follows: <br />1. No additions; <br />2. Adding Well 7 and a ground storage reservoir; and <br />3. Adding Well 7, a ground storage reservoir, and looping the system across I-35E. <br /> <br />Each scenario was modeled with the largest well out of service (firm capacity) as recommended by 10- <br />State Standards. The model results show that the existing distribution system can support the Mattamy <br />Homes area, but that additional infrastructure will be required as development occurs within the City. <br /> <br />Average Day Maximum Day <br />Existing Well 7 and <br />GSR <br />Well 7 and <br />Loop Existing Well 7 and GSR Well 7, GSR, <br />and Loop <br />Existing system <br />plus Mattamy <br />development <br />56 58 58 42 47 53 <br />Existing system <br />plus Mattamy <br />development and <br />additional future <br />development <br />56 57 58 26 35 49 <br />10-State Standards recommend that the normal working pressure (average day) be approximately 60 psi with minimum <br />working pressures 35 psi. <br /> <br />Equal Opportunity Employer <br /> wsbeng.com K:\02029-820\Admin\Docs\Water System\Appendix A - Modeling Results.docx