| General:
The following notes and specifications are intended to
assist irrigation Contractors in the installation of an
irrigation system that complies with the Dublin San Ramon
Services District (District) Standards Section IV, Recycled
Water System Requirements. The notes included below are
generally the most significant requirements. However,
it should be noted that not all of the District standards
are identified below. Where differences between District
Standards Section IV and the following notes occur, District
Standards shall apply. The Contractor is required to be
familiar with and comply with all of the requirements
of the District Standards Section IV. |
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| 1. |
No work shall start
until the contractor has complete familiarization with
the District Standards and issuance of the required permits. |
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| 2. |
Notify
the District's authorized representative no less than
2 working days prior to the start of work for inspection
schedule coordination. |
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| 3. |
The
irrigation system design for this site is based on a static
pressure at the recycled water meter of ____psi. The Contractor
shall verify the available pressure at the point of connection
prior to the start of construction. Any deviation from
the design pressure shown above shall be reported to the
irrigation system designer or property owner immediately. |
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| 4. |
All
piping and irrigation systems shall be designed and constructed
so that spray or runoff shall not enter a dwelling, food
handling facility, or eating area and shall not contact
any drinking water fountain. Irrigation with recycled
water shall be accomplished at a time and manner that
minimizes the possibility of public contact. The Contractor
shall conduct pressure and coverage tests when wind conditions
are such that water will not be windblown. Recycled water
overspray on to areas not controlled by the owner is prohibited. |
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| 5. |
The
Contractor shall properly supervise, inform and warn all
individuals involved in the installation of the recycled
water irrigation system regarding the hazards of contact
with recycled water. A first aid kit shall be available
at all times during installation and operation of irrigation
system. |
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| 6. |
All
recycled water piping shall use purple colored and stenciled
pipe, purple recycled water warning tape continuously
applied to the pipe, or marked plastic encasement. All
marking shall include the following or similar words:
"Caution: Recycled Water – Do not Drink".
Purple pipe shall be "PWPurple Plus" manufactured
by PWPipe, Inc., JM "Purple Save" or approved
equal. |
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| 7. |
Warning
tape or pipe encasement installed shall be as manufactured
by T. Christy Enterprises, Rencor or equal. |
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| 8. |
Install
valves, meters and appurtenances in purple colored valve
boxes with purple lids. The valve box lid shall have the
following warnings molded or hot-stamped upon it: "RECYCLED
WATER", or use warning label by T. Christy Enterprises
3800 or equal. |
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| 9. |
All
sprinklers used in customer recycled water facilities
shall have an exposed surface colored purple to associate
them with recycled water use. The exposed surface may
be colored purple through the use of: (1) dyed plastic
or rubber, or (2) weatherproof paint. |
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| 10. |
Install
warning tags as manufactured by T. Christy Enterprises3150
or equivalent to all such control valves, gate valves,
quick coupler valves, controllers, meters, etc. Tags shall
be weatherproof plastic, 3-inch by 4-inch, purple in color
with the words "Warning: Recycled Water – Do
Not Drink" imprinted on one side and "Aviso:
Aqua Impura – No Tomar" on the other side, or
similar as approved by the District Engineer. Imprinting
shall be permanent and black in color. |
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| 11. |
Prior
to installation, locate domestic water mains and/or laterals
(as appropriate). Recycled water irrigation pipelines
and private potable water pipelines shall be installed
in separate trenches with the greatest possible horizontal
separation from private potable water pipelines. Where
possible minimum clearances of 10' foot horizontal and
1' foot vertical shall be maintained between potable and
recycled water lines. Where recycled water irrigation
pipelines and private potable water pipelines cross, the
potable water pipe shall be installed a minimum of twelve
(12) inches above the recycled water piping. |
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| 12. |
Recycled water piping shall be installed at the following
minimum depths from finished grade to top of pipe (minimum
cover) shall be as follows:
a) Constant
pressure lines 3 inches or larger: 24 inches
b) Constant
pressure lines 2-l/2 inches and smaller: 18 inches
c) Intermittent
pressure lines: 12 inches
Where piping is under paved areas, these dimensions
shall be increased to include the roadway section and
adequately protect the piping from damage from traffic
loads.
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| 13. |
(Use
this note only if PW service is available.) No hose bibs
shall be used for recycled water systems. Quick-coupling
valves shall be constructed of brass with a purple rubber
or vinyl cover, and shall have a 1-inch inlet with acme
thread body, Nelson Model 7645 or equal, and key, Nelson
Model 7640 or equal. |
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| 14. |
Record
drawings of customer facility irrigation systems shall
be provided to the District. |
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| 15. |
The
irrigation controller shall be programmed to water between
the hours of 9:00 PM and 7:00 AM only. Additional restricted
watering times may be established based on site conditions
as directed by the District representative. |
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| 16. |
Flushing
of recycled water through irrigation system piping shall
be performed in a manner that minimizes discharge from
the site or creates ponding. Flushing shall not be permitted
in a way that creates puddles that allows the recycled
water to become stagnant. Flushing into the sanitary sewer
is the most acceptable way to discharge recycled water.
If this is not possible, then flushing may be done by
diverting recycled water into a storage tank, tank truck
or other approved holding facility. Holding facilities
must be clearly marked with warning signs. Recycled water
shall be transported and discharged at an approved site
in an approved manner. |
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| 17. |
Where
both potable and recycled water customer facilities exist
at a site (dual system), a cross-connection inspection
and test shall be performed on both the potable and recycled
water systems. The cross-connection test will be conducted
by District staff in accordance with Section IV-B3 of
the District Standards. The Contractor shall request the
cross-connection test by the District a minimum of 2 days
prior to the performing the test. Recycled water piping
shall be tested using potable water with an approved backflow
prevention device. The backflow testing shall be performed
in accordance with District specifications, Section II-B3
and shall be certified prior to any cross-connection testing |
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| 18. |
The
Contractor shall perform a coverage test in the presence
of District inspection staff to confirm that excessive
overspray does not occur in accordance with Section IV-B3-4.
Any modifications in either the system equipment, or adjustment
identified by the District during the coverage test shall
be completed in accordance with the schedule and conditions
determined by the District at the time of the test.
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| 19. |
In
all areas where recycled water is used that is accessible
to the public, place warning signs shall be installed
at jointly approved City and District locations. Signs
shall be supplied by the District for installation by
the Contractor in accordance with the District's sign
post detail. |
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| 20. |
(Additional note for systems that will be connected
to the potable water system for an indefinite period
of time). This irrigation system is designed to accommodate
the future connection to recycled water source when
it becomes available at this site. When this connection
is made, the potable water source connection shall be
completely disconnected from the irrigation system.
There is currently no recycled water source available
at this site and this irrigation system is designed
to utilize a potable water source connection. Irrigation
systems and equipment installed under this contract
shall conform with the District's Recycled Water System
Requirements, Section IV.
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