2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

SPU requires a pre-installation taste and odor testing of water pipe (Standard
Specification 7-11.2[2]) of non-approved pipe sources. Request a current list from the
SPU Water Quality group.
B. Pipe Installation and Repairs
Controlling water and soil from entering pipes is a critical factor for achieving sanitary
conditions in water mains. See Standard Specifications for sanitary control practices for
water main construction and repairs:
Section 7-11.3(2)A Handling of Pipe – General
Section 7-11.3(5) Cleaning and Assembling Joints
5.10.3.4 Post-Construction or Repair Startup and Acceptance
A. Acceptance
After water main construction or repair, the following requirements must be met before
SPU will accept the connection to the water system and place it into service:
Hydraulic and structural integrity, as demonstrated by hydrostatic pressure
testing
Sanitary conditions, as provided by flushing, disinfection, and verified by water
quality testing
B. Hydrostatic Pressure Testing
Water mains and appurtenances, including extensions from existing water mains greater
than 18 feet, hydrants, and hydrant runs must meet the requirements of Standard
Specification 7-11.3(11).
C. Cleaning and Flushing
After a water main installation has passed the hydrostatic pressure tests, cleaning and
flushing must be completed per the requirements of Standard Specification 7-11.3(12)B.
D. Disinfection
The following Standard Specifications address water main disinfection procedures:
Section 7-11.3(12)C
Section 7-11.3(12)D
Section 7-11.3(12)E
Section 7-11.3(12)F
Section 7-11.3(12)G
Section 7-11.3(12)H
Section 7-11.3(12)K
Required Contact Time
Form of Applied Chlorine
Chlorine Dosage
Point of Application for Liquid/Gas Disinfection
Backflow Prevention Requirement
Rate of Application
E. Water Quality Testing and Criteria
Disinfection of Connections to Existing Water Systems
5-68 SPU Design Standards and Guidelines