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Building a legacy – your legacy. 701 Xenia Avenue South Suite 300 Minneapolis, MN 55416 Tel: 763-541-4800 Fax: 763-541-1700 APPENDIX B – CITY OF LINO LAKES PRODUCTION AND STORAGE EVALUATION Design Requirements The City is served by five production wells, with a sixth well currently in production. It is recommended that the capacity of the production wells with the largest well out of service be equal to or greater than the maximum day demand. The City also has two elevated storage tanks. Storage tank capacity should be equal to the average day demand plus an additional volume for firefighting. Existing System Production The City currently utilizes wells to withdraw ground water for water supply purposes. Ten States Standards recommends that maximum day water demand is accommodated with the largest well pump out of service (designated as firm capacity). The City currently has five production wells, with Well No. 6 in construction. It is recommended that wells be able to supply the peak day demand at firm capacity. The City’s peak day demand from 2013 to 2015 was, on average, 2,750 gallons per minute (3.9 MGD). A summary of the production capacity is shown in Table 1. Table 1: Lino Lakes Production Capacity Well Flow (gpm) Flow (gpd) 1 675 972,000 2 625 900,000 3 1,200 1,728,000 4 750 1,080,000 5 1,100 1,584,000 6* 1,200 1,728,000 Total Flow* 5,550 7,992,000 Firm Capacity* 4,350 6,264,000 Peak Day Demand 2,750 3,960,000 Remaining Capacity (Firm Capacity minus Peak Day Demand) 1,600 2,304,000 *Well 6 is under construction – flow rates are estimates based on preliminary pumping tests Storage The City of Lino Lakes currently utilizes elevated water towers for water storage. There are a number of published design recommendations for water storage. The American Water Works Association recommends that system storage equal the average day demand with a “reasonable” fire-fighting reserve. The fire-fighting reserve varies from city to city. For this report, it was assumed that the City should be able to supply 1,750 gpm for 3 hours. This is consistent with ISO’s recommendation for a system serving primarily built-up residential to light commercial. From 2011 to 2015, the City’s average day demand was 1.39 MG. Table 2 outlines the City’s storage capacity. Equal Opportunity Employer wsbeng.com K:\02029-820\Admin\Docs\Water System\Appendix B - System Capacity.docx