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City of Elk River Design Standards <br />D. A streetlight should be installed at each lift station. <br />2. General Configuration — the plan must indicate the proposed location of the Control Panel <br />which is subject to approval by the Wastewater Superintendent and City Engineer. <br />3. Structures <br />A. Minimum Size — 72" is to be a minimum diameter for both the wet well and valve vault. <br />Depending on the size of the pumps, the wet well mav need to be larger. <br />B. The bottom of the valve vault is to be provided with 4" of slope across the vault to the <br />drain oudet. The drain line should exit the valve vault horizontally through the wall <br />instead of vertically through the floor. A backflow check valve needs to be installed on <br />the drain line to pre�rent backflow of water and gas from the wet well to the �ralve �rault. <br />A trap should also be located in the drain line as a back up to the check valve for <br />preventing gas flow back into the vault. <br />C. All pipe work and fittings shall be contained within the valve manhole. Short-radius 90- <br />degree bends and tee should be use. <br />D. A 4-inch drain with grate from the valve manhole to the lift station shall be provided. A <br />threaded Zurn Z-509 outlet and Zurn Z-1099 ball float ty�pe backwater valve or <br />approved equal is required. <br />E. The vent pipe for the wet well needs to be cast into the concrete top slab. <br />4. Access Hatch <br />A. blinimum Size — 30" x 48" <br />B. Access hatch frames should be angle frame-rype with hasp and staple for a padlock. <br />5. Pi�ing and Valves - Resilient wedge gate valves and the external lever and weight rype check <br />valves should be supplied. <br />6. Pu�ps <br />A. Acceptable pump manufacturers shall be KSB. <br />B. A lifting hook or approved equal should be provided for pulling the pumps. <br />7. Controls and Control Panel <br />A. Simple Floats and Relays should be specified for small stations. <br />B. Floats should be hanging n�pe — not anchored. <br />C. Five Floats should be provided (include low level alarm float). <br />D. Run-time meters ('/4" minimum size) — hour meters, no minute meters. <br />E. Control Panels are to be stainless steel. <br />F. Light in panel should be porcelain incandescent lamp. <br />G. A reel strobe light alarm with buzzer shall be included on top of the control panel with <br />reset switch. The reset switch shall be located inside the control panel. A battery backup <br />with charger shall be provided for the alarms. <br />H. No alarm horn should be included with the panels. <br />I. Use tape tvpe heaters in the panel. <br />J. Auto Dialer — In the lift station panel design, leave a 16" x 20" space for the auto dialer <br />box. <br />K. An oudet needs to be included on the front side of panel. <br />L. Magnetic fasteners for the inside dead-front panel shall be supplied. <br />M. Installation of SCADA systems and equipment in accordance with City s�stem. <br />Testing <br />1. Low-Pressure r�ir Test <br />All gravity sanitary� sewer lines, including service connections, shall be substantiallv watertight <br />OO City of Elk River, Minnesota — All rights reserved 23 <br />