4.4 SR 04-19-2021 - Laserfiche WebLink

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City of Elk River Design Standards degree bends and tee should be use. D. A 4-inch drain with grate from the valve manhole to the lift station shall be provided. A threaded Zurn Z-509 outlet and Zurn Z-1099 ball float type backwater valve or approved equal is required. E. The vent pipe for the wet well needs to be cast into the concrete top slab. 4. Access Hatch A. Minimum Size — 30" x 48" B. Access hatch frames should be angle frame -type with hasp and staple for a padlock. 5. Piping and Valves - Resilient wedge gate valves and the external lever and weight type check valves should be supplied. Pumps A. Acceptable pump manufacturers shall be KSB. B. A lifting hook or approved equal should be provided for pulling the pumps. Controls and Control Panel A. Simple Floats and Relays should be specified for small stations. B. Floats should be hanging type — not anchored. C. Five Floats should be provided (include low level alarm float). D. Run-time meters (1/4" minimum size) — hour meters, no minute meters. E. Control Panels are to be stainless steel. F. Light in panel should be porcelain incandescent lamp. G. A reel strobe light alarm with buzzer shall be included on top of the control panel with reset switch. The reset switch shall be located inside the control panel. A battery backup with charger shall be provided for the alarms. H. No alarm horn should be included with the panels. I. Use tape type heaters in the panel. J. Auto Dialer — In the lift station panel design, leave a 16" x 20" space for the auto dialer box. K. An outlet needs to be included on the front side of panel. L. Magnetic fasteners for the inside dead -front panel shall be supplied. M. Installation of SCADA systems and equipment in accordance with City system. Testing 1. Low -Pressure Air Test All gravity sanitary sewer lines, including service connections, shall be substantially watertight and shall be tested for excessive leakage upon completion and before connections are made to the service by Others. Each test section of the sewer shall be subjected to exfiltration testing by the ASTM F1417 (low pressure air) test method regardless of pipe material. The requirements set forth for maximum leakage shall be met as a condition for acceptance of the sewer section represented by the test. All testing shall be performed by the Contractor without any direct compensation being made therefore, and the Contractor shall furnish all necessary equipment and materials, including plugs and standpipes as required. The sewer pipe section under test shall be clean at the time of testing but the pipe may be wetted. Pneumatic balls shall be used to plug the pipe ends at manholes. Low pressure air shall be introduced to the plugged line until the internal air pressure reaches three and one half (3.5) psi greater than the average back pressure of any ground water pressure that may submerge the pipe. At least two (2) minutes shall be allowed for the air temperature to stabilize before readings are taken and the timing started. During this time the Contractor shall check all plugs © City of Elk River, Minnesota — All rights reserved 21