City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 5.2.9 Inverted Siphons The use of an inverted siphon to avoid obstructions along the alignment of the wastewater main requires approval by the Director of Engineering Services. Should an inverted siphon be necessary the design shall include: A. Two or more barrels (pipes). B. A minimum pipe diameter of 6”. C. The necessary appurtenances for convenient flushing and maintenance. D. One upstream and one downstream of a manhole for cleaning equipment, inspection and flushing. E. The siphon must be sized with sufficient head to achieve velocity of at least 3 fps at initial and design flows. F. The inlet and outlet shall divert the normal flow to one barrel. G. The system shall be designed to allow any barrel to be taken out of service for cleaning. H. The system shall be designed to minimize nuisance odors. 5.2.10 Wastewater Lift Stations Subdivisions shall be laid out so that all wastewater mains will be gravity flow. The use of a wastewater lift station must be approved by the Director of Engineering Services and the Director of Public Works. A. All wastewater lift stations shall be designed in accordance with TCEQ Chapter 217, Subchapter C. B. The Engineer shall prepare an engineering design report for the wastewater lift station. C. The lift station shall be connected to the City Supervisory Control and Data Acquisition (SCADA) system. The Owner shall pay all costs associated with the SCADA including all labor, equipment, materials, and programming of the City’s computer and testing. The SCADA equipment installed shall conform to the City’s standard specifications for Computerized Monitoring and Control Specifications for Wastewater Lift Stations. D. Control panels shall have heaters and exhaust fans, CT for reading amperage, HOA switch, and an amp overload reset button on the outside of the panel. E. All lift stations shall include a bioxide injection system for odor control. F. The bioxide tank shall have a concrete foundation. G. If carbon filters are required, the housing shall be painted per the approval of the Director of Engineering Services. H. Lift stations with two or more wet wells shall include a sluice gate between each wet well. I. Each pump shall have two guide rails. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-14
Engineering Standards Version 6/19/12 J. Pumps shall be controlled by floats. K. Pumps shall include hydraulic mixed flush valves. L. For triplex pump stations, all three pumps are required to have swinging check valves, breakers, starters and floats for emergency situations. M. All lift stations shall include a landscaping and irrigation plan that shall be approved by the City’s landscape architect. N. All lift stations shall include an 8’ tall tubular steel fence with 16’ slide gate. O. A 2” blow off with an isolation valve and RPZ shall be installed next to the vault opposite the control panel. 5.2.11 Force Mains A. Use white-colored pipe material whenever available. B. 12” and smaller pipe shall be PVC ASTM D2241 SDR 26, or as determined by the Engineer. C. Pipes larger than 12” shall be PVC AWWA C905 DR 18 or as determined by the Engineer and approved by the Director of Engineering Services. D. Minimum size for force mains is 6”. E. Plug valves shall be installed every 1,000’ of force main 5.2.12 Dumpster Enclosure Drains A. Dumpster enclosures serving commercial sites that will need to have the enclosure washed out shall provide a connection to the sanitary sewer system. B. Connection shall provide a water-tight sealed cover that can be removed to drain enclosure during periodic cleaning. C. Dumpster enclosure shall be constructed to prevent parking lot stormwater runoff from entering enclosure area. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-15
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City of Frisco Engineering Standards

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