Section 20 - Landscaping
07/24/01
20.15
strainer, gate valves, pipe fittings, portland cement concrete supports, and portland cement
concrete pad for the assembly, and shall conform to the details shown on the Plans, these
Specifications, and the Special Provisions. Components of the backflow preventer assembly
shall be of the type shown on the Plans or specified in the Special Provisions and shall conform
to Section 50-43.25, "Backflow Preventers”, of these Specifications. Backflow preventer
assemblies shall be from the approved list issued by the Sacramento County Environmental
Health Division.
Installation of backflow preventer assemblies shall conform to Agency codes and ordinances
regarding cross connection control installation, shall be UL listed and approved by the Research
Foundation for Cross Connection Control, University of Southern California. Special attention
shall be given to the minimum and maximum heights of assemblies.
The bottom of backflow preventers shall be installed twelve inches (12”) above finished
grade or concrete pad. Exposed top surfaces of concrete foundations and pads shall have a
medium broom-finish applied parallel to the long dimension of foundations and pads. Backflow
preventer assembly shall be tested by a certified backflow device tester prior to initial usage and
operation of the system.
Backflow preventer installations shall include a backflow device protection blanket.
20-5.05.E Master Valve/Flow Meter Assembly
Assembly shall conform to Section 50-43.23, “Master Control Valve/Flow Sensor Assembly”,
of these Specifications and be installed in accordance with Standard Drawing L-6. Assembly
shall be installed after the water meter and the backflow preventer at the irrigation point of
connection. Assembly shall be as shown or specified in the Contract, and shall conform to
Section 50-43.23, “Master Control Valve/Flow Sensor Assembly”, of these Specifications.
Installation shall include providing five (5) #14 control wires, unless otherwise specified, from
the master valve/flow meter assembly to the irrigation controller. Wiring shall include a hot and
a common conductor for both the master valve and the flow meter and one (1) spare conductor.
20-5.05.F Air Vacuum Relief Valve
Air vacuum relief valve shall conform to Section 50-43.30, “Air Vacuum Relief Valve”, of
these Specifications and shall be installed in accordance with Standard Drawing L-8.
Air vacuum relief valve shall be installed in-line with a subsurface dripperline at the highest
point of the system. Valve box for the air vacuum relief valve shall be ten inches (10") diameter
with a two-inch (2”) layer of pea gravel and installed two inches (2”) above finished grade.
20-5.05.G Flush Valve
Flush valve shall conform to Section 50-43.31, “Flush Valve Assembly”, of these
Specifications and shall be installed in accordance with Standard Drawing L-7.
Flush valve shall be installed at the end of a subsurface dripperline system as shown on the
Plans. Valve box for the flush valve shall be ten inch (10") diameter with a two-inch (2”) layer of
pea gravel and installed two inches (2”) above finished grade.
Installation shall include providing a plastic ball valve before the flush valve with an
eighteen-inch (18”) minimum length of flexible hosing or blank dripperline for the purpose of
periodic system maintenance.
20-5.05.H Sprinklers and Emitters
Sprinklers and emitters shall conform to Section 50-43.19, “Sprinklers and Emitters”, of
these Specifications and shall be installed in accordance with Standard Drawings L-9, L-10, L-
11, and L-12.



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