Section 20 - Landscaping
07/24/01
20.14
The Contractor shall install the pipe to line and grade, as staked by the Agency. The
Contractor's facilities for lowering the pipe into the trench shall be such that neither the pipe nor
the trench will be damaged.
All pipes shall be assembled free from dirt, pipe scale, and burrs. Each section of lateral
pipe shall be flushed out before sprinkler heads or emitters are attached.
Plastic pipe shall not be laid when there is water in the trench.
20-5.05.A Subsurface Dripperline
Subsurface dripperline shall conform to Section 50-43.17, “Subsurface Dripperline”, of these
Specifications and shall be installed in accordance with Standard Drawings L-13, L-14, and L-
15.
Dripperlines shall be installed four inches (4”) below finish grade unless otherwise specified
on the Plans or in the Special Provisions. Dripperlines shall be installed at the spacing distance
specified on the Plans or in the Special Provisions. Install dripperlines with orifices facing down
and as shown on the Plans.
Dripperlines shall be installed using barbed fittings only. Subsurface dripperline systems
shall be installed with flush valves and air vacuum relief valves.
20-5.05.B Valves and Valve Boxes
Irrigation control valves and valve boxes shall be of the type shown on the Plans or specified
in the Special Provisions and shall conform to Sections 50-43.22, “Control Valves,” and 50-
43.24, “Valve Boxes”, of these Specifications. Irrigation control valves shall be installed in
accordance with Standard Drawings L-3 and L-4.
The Contractor shall provide and install valves as shown on the Plans and as required for
the proper control of the piping systems in which they are incorporated. Main shut-off valves
shall be gate valves.
Where a remote control valve is shown on the Plans as located at the edge of turf and shrub
areas, it shall be placed in the shrub area.
Valves shall be placed in groupings for ease of maintenance.
Valve boxes that contain remote control valves shall be identified on the top surface of the
valve box covers by the appropriate letters and numbers for controller and station numbers as
shown on the Plans.
Valve boxes shall be identified by labels attached to the covers that contain the appropriate
abbreviations. Remote control valves shall be labeled with the controller station. Quick
coupling valves shall be labeled “QCV.” Gate valves shall be labeled “GV.” Labels for valve
boxes shall consist of engraved letters and numbers on a two-layer white over black, exterior-
sign-plate plastic. The dimensions of the labels shall be a minimum of two inches by three
inches by one-eighth inch thick (2" x 3" x 1/8" thick). The letters and numbers shall be a
minimum of one and one-eighth inches (1-1/8”) in height. Labels shall be attached to the valve
box covers with commercial quality brass or stainless steel machine screws, nuts, and washers.
Valve boxes shall be provided with valve box extensions when required.
20-5.05.C Quick Coupling Valve
Quick coupling valves shall conform to Section 50-43.21, “Quick Coupling Valves”, of these
Specifications and shall be installed in accordance with Standard Drawing L-5. Quick coupling
valves shall be installed with Sch. 80 PVC fittings and swing joint assemblies.
Valve box for the quick coupling valve shall be ten-inch (10") diameter and installed two
inches (2”) above finished grade.
20-5.05.D Backflow Preventers
Backflow preventers shall conform to Section 50-43.25, “Backflow Preventers”, of these
Specifications and shall be installed in accordance with Standard Drawing 8-8A or 8-8B, unless
otherwise specified. Backflow preventer assemblies shall consist of backflow preventer, wye



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