City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 5.2.6 Wastewater Main Materials A. Polyvinyl Chloride (PVC) Wastewater Pipe 1. PVC non-pressure rated gravity wastewater mains from 6” to 15” in diameter shall be SDR 35 (if less than 15’ deep) or SDR 26 (if 15’ or deeper) (ASTM D3034) . 2. PVC non-pressure rated gravity wastewater mains 18” in diameter and greater shall have a minimum pipe stiffness of 46 psi or 115 psi and be manufactured in accordance with ASTM F679 (solid wall). 3. PVC pressure rated gravity wastewater mains and force mains from 6” to 12” in diameter shall be SDR 26 (ASTM D2241) with a minimum pressure rating of 160 psi. 4. PVC pressure rated gravity wastewater mains and force mains greater than 12” in diameter shall be AWWA C905 DR25 with a minimum pressure rating of 165 psi. 5. PVC profile wall pipe will not be allowed. B. Fiberglass (Glass-Fiber-Reinforced Thermosetting Resin) Pipe 1. Fiberglass non-pressure rated gravity wastewater mains 18” in diameter and greater shall be in accordance with ASTM D3262 with a minimum pipe stiffness of 46 psi and Class “B-2” embedment in accordance with NCTCOG Item 504.5 and Standard Drawing 3020. 2. Fiberglass pressure rated gravity wastewater mains and force mains 18” in diameter and greater shall be in accordance with ASTM D3754 with a minimum pressure rating of 150 psi and Class “B+” embedment in accordance with NCTCOG Item 504.5 and Standard Drawing 3020. C. Vitrified clay pipe will not be allowed. 5.2.7 Wastewater Service Laterals The sizes and locations of laterals shall be designated as follows: A. Wastewater service laterals for single-family residential shall be a minimum of 4” in diameter. Laterals shall be installed 10’ downstream from the center of the lot and have a minimum separation distance of 10’ separation from the water service. B. Wastewater service laterals for multiple units, apartments, local retail and commercial developments shall be a minimum of 6” in diameter. C. Wastewater service laterals for manufacturing and industrial shall be a minimum of 8”. D. Manholes are required on 6” and larger wastewater service laterals where they connect to the main line. E. Wastewater service laterals shall not be attached to wastewater mains that are deeper than 12’. Deep cut or drop connections are not be permitted. F. Each building shall have only one wastewater service lateral, except duplexes which shall have two wastewater service laterals independently attached to the main. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-12
Engineering Standards Version 6/19/12 G. All mains installed for future developable areas shall include wastewater service laterals; the use of boots will not be permitted. H. All wastewater service laterals crossing water mains shall conform to the requirements of the TCEQ Chapter 217, Subchapter C, Rule 217.53(d), latest revision, or Section 5.2.3 of this standard. 5.2.8 Manholes and Cleanouts A. Manholes shall be installed at all changes in grade and direction, and have a maximum spacing of 500’. B. Spacing between a manhole and an upstream cleanout shall be a maximum of 250’. A cleanout or manhole shall be located at the end of a wastewater main. C. Manholes on curved wastewater mains shall be located at the P.C. or P.T. of the curve and have a maximum spacing of 300’ along the curve. D. Manholes shall be constructed of monolithic, cast-in-place concrete, precast concrete or fiberglass. E. Manholes shall be concentric type unless otherwise approved by the Director of Engineering Services. F. Drop manholes shall be required when the inlet pipe flow line elevation is more than 24” above the outlet pipe flow line elevation. Drops shall be outside the manhole unless otherwise approved by the Director of Engineering Services. G. Manholes shall be sized as follows: 1. 4’ in diameter for 8”, 10”, and 12” pipe. 2. 5’ in diameter for 15”, 18”, 21”, 24” and 27” pipe. 3. 6’ in diameter for 30” and 36” pipe. 4. 5’ in diameter minimum for manholes deeper than 15’. H. Where more than three manholes in sequence are to be bolted and sealed, every third manhole shall be vented 2’ above the 100-year floodplain elevation or 10’ above the adjacent ground line, whichever is higher. The Engineer shall provide the elevation of the 100-year floodplain on the profile. I. Construct manholes within 30’ of each end of wastewater mains that are installed by other than open cut and within 30’ of each end of aerial crossings. J. Manholes shall not be located in parking spaces. K. A manhole with pipes of different sizes must have the tops of the pipes at the same elevation and flow channels in the invert sloped on an even slope from pipe to pipe. Section 5 – Water & Wastewater Design Requirements May 2012 Page 5-13
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City of Frisco Engineering Standards

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