2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...
2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...
2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...
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Chapter 5 <strong>Water</strong> Infrastructure<br />
5.10.3 Construction, Startup and Acceptance<br />
Procedures<br />
The design and specifications of transmission and distribution water mains must address the<br />
potential impacts of construction and repair activities on the hydraulic and sanitary conditions<br />
of the water system. Such activities pose the greatest risk of microbiological contamination of<br />
new and existing water mains. Appropriate design and specification requirements are major<br />
elements to achieving hydraulic requirements and sanitary conditions after construction or<br />
repair of water mains.<br />
See the following Standard Specifications for construction (installation), startup, and acceptance<br />
of new and repaired water mains and appurtenances:<br />
Section 7-11<br />
Section 7-12<br />
Section 7-14<br />
Pipe Installation for <strong>Water</strong> Mains<br />
Valves for <strong>Water</strong> Mains<br />
Hydrants<br />
For further information on design and operational practices to prevent contamination of water<br />
mains, see the <strong>Water</strong> Foundation publication, Practices to Prevent Microbiological<br />
Contamination of <strong>Water</strong> Mains.<br />
5.10.3.1 Connections to <strong>City</strong> <strong>Water</strong> Mains<br />
All connections of new or repaired water mains to the SPU water system are made by SPU<br />
<strong>Water</strong> Operations. See Standard Specification 7-11.3(9)A and Standard <strong>Plan</strong>s 300a, 300b, and<br />
300c.<br />
5.10.3.2 Shutdown of <strong>Water</strong> Mains<br />
Shutdown and isolation of new and existing water mains must be addressed as part of design.<br />
There are three major considerations for the shutdown and isolation of mains:<br />
1. Provide adequate numbers of valves for the isolation of the new or repaired mains<br />
to minimize impacts to water service in the distribution grid<br />
2. Work with SPU <strong>Water</strong> Operations to provide a means to depressurize and dewater<br />
the main for a shutdown<br />
3. Consideration of which customers will be out of water and for how long. For<br />
customer impacts and service disruptions, see DSG section 5.10.4.<br />
5.10.3.3 Construction and Repair Practices for Sanitary Control<br />
The following section describes construction and repair practice for sanitary control.<br />
A. Pre-installation Materials Storage and Handling<br />
Proper handling and storage practices (Standard Specification 7-11.3[2]) are key<br />
elements for achieving sanitary conditions in water mains.<br />
SPU Design Standards and Guidelines<br />
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