City of Frisco Engineering Standards

Engineering Standards
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