§ 51.17  SPECIFICATIONS.
   The following provisions and specifications are approved specifications and provisions for water system construction in the city.
   (A)   Materials.  All water lines shall be constructed of approved materials.  Main distribution lines and feeder lines shall be constructed of ductile iron or AWWA C900 polyvinyl chloride pipe of SDR 21, 200 psi (minimum).  Mechanical joints, or a joint of the type which provides a recession in the bell for the employment of a single rubber gasket to be placed before the insertion of the succeeding spigot, shall conform to A.S.T.M. F 477.
   (B)   Size.  Main distribution lines shall not be less than 8 inches inside diameter, except where a main distribution line is proposed to serve a cul-de-sac less than 400 feet with 6 homes or less, whereupon a 4-inch line may be allowed, provided a fire hydrant is not required.  Larger diameter pipe may be required by the city.
   (C)   Surface markings.  A suitable and permanent marking shall be approved by the city and provided at ground surface level which will aid in locating the position of main distribution lines, feeder lines, and cut-off valves.  Surface markings shall not be covered by vegetation or soil such that their location would be hidden.
   (D)   Utility easements.  Sufficient easements for the water system shall be granted to the city for the purpose of serving the water system and for reading water meters.  Easements shall not be less than 20 feet in width.  No permanent construction, building, fence, or any other improvement which prohibits access to the water system shall be located within the easement.
   (E)   Location.  Main distribution lines, feeder lines, and water meters shall be located within the utility easement.  Main distribution lines and feeder lines shall not be closer than 2.5 feet to the boundary of the easement as measured from the closest surface of the pipe to the boundary of the easement.  Water meters may be located outside of the easements, but shall not be more than 1 foot from the extreme point of the meter to the boundary of the easement.
   (F)   Trenching.  Trenches for installing water main lines shall be a minimum of 18 inches in width and 12 inches wider than the diameter of the pipe.  Water mains shall be at least 42 inches below ground level.  The trench bottom shall be bedded with 4 inches of tamped sand or gravel.  A minimum of 2 inches of bedding sand shall cover the top surface of the pipe.  Any person that installs water mains shall be responsible for trench safety and stability.
   (G)   Fire hydrants.  Fire hydrants shall be installed as may be required to provide that no structure is more than 450 feet from a fire hydrant.  Standard 3-way fire hydrants, approved by the city, are required, with five 6-inch or larger connections to mains with a minimum of 5-inch valve openings.  Each fire hydrant shall have a cut-off valve.
   (H)   Valves.
      (1)   Cut-off valves are required not more than 800 feet apart and shall be placed in such a manner as to require 2 but no more than 3 valves to shut down an area equivalent to 1 city block, or as many as may be required to prevent shutting down any more than 1 fire hydrant.
      (2)   On cross-fed main lines without services, a maximum of 4 valves shall be used to shut down each area equivalent to 1 city block.  Valves shall be placed at or near the end of mains in such a manner that a shut-down if required can be made for a future main extension without causing loss of service on the existing main.  Valves of 12 inches or under shall be resilient seat gate valves (RSGV).  Valve boxes shall have a concrete pad around them for easy location with the top of the valve box level with the final grade.
(Ord. 337, passed 4-9-1991; Am. Ord. 345, passed 2-11-1992)  Penalty, see § 51.99