Section 20 - Landscaping
07/24/01
20.16
20-5.05.I Pressure Testing
Except for nonrigid pipelines and lateral irrigation lines, pressure testing for leakage shall be
performed on all supply lines installed by the Contractor. Pipelines shall be tested in place and
all open ends of the pipeline and fittings shall be plugged or capped prior to testing.
The Contractor shall notify the Agency at least twenty-four (24) hours prior to performing any
pressure test. Pressure tests shall be performed only between the hours of 8:00 a.m. and 5:00
p.m. except that no pressure tests shall be made on Saturdays, Sundays, or legal holidays,
unless otherwise approved in writing by the Agency. Each pressure test shall be observed by
the Agency.
Pipelines to be tested shall be filled with water, and a pressure gauge shall be connected to
the pipeline. The pipe shall then be placed under a pressure of one hundred twenty-five pounds
per square inch (125 psi) (except as otherwise specified below) by air or water pressure, after
which the source of pressure shall be cut off, leaving the line under the required pressure.
The pressure gauge shall be calibrated from zero (0) to two hundred (200) pounds per
square inch (psi) in five-(5-) pound increments and shall be accurate within a tolerance of two
(2) pounds.
The Contractor shall provide the necessary pump and equipment required for this test.
The pipeline shall be tested under the required pressure for a period of one (1) hour. The
pressure gauge shall remain in place until each test period has been completed. Leaks that
develop in the tested portion of the system shall be located and repaired after each test period
when a drop of more than two (2) pounds is indicated by the pressure gauge when testing pipe
over one hundred feet (100’) in length. There shall be no pressure drop permitted when testing
pipe from one foot (1’) to one hundred feet (100’) in length. After such leaks have been
repaired, the one- (1) hour pressure test shall be repeated and additional repairs made until
there is no drop in pressure for pipe lengths up to one hundred feet (100’), or the drop in
pressure is two pounds per square inch (2 psi) or less for pipe lengths over one hundred feet
(100’). If testing by means of water pressure, air shall be expelled from the pipe prior to testing.
Tests on pressure lines shall be completed prior to backfilling; however, sufficient backfill
shall be placed in trenches between fittings to insure the stability of the line under pressure. In
all cases, fittings and couplings must be open to visual inspection for the full period of the test.
No testing shall be done until the last solvent welded joint has had twenty-four (24) hours to
cure.
Where any section of the pipe system is provided with a concrete thrust block, the test shall
not be made until at least five (5) Calendar Days have passed after the concrete thrust block
was installed. If higher early-strength cement is used in the concrete thrust block, the test shall
not be made until at least two (2) Calendar Days have elapsed.
Contractor shall disinfect potable water lines according to AWWA standards.
20-5.05.J Repairs and Coverage
All leaks that develop and all defective material in any portion of the irrigation system
installed by the Contractor shall be repaired or replaced by the Contractor.
The entire system shall be checked and, if necessary, adjusted for uniform and complete
coverage after installing the sprinklers. All emitters shall be checked for proper operation and, if
necessary, cleaned and replaced.
The risers for sprinklers on slopes shall be set approximately perpendicular to the slope.
Each series of sprinklers shall be installed and test operated. Nozzles of all sprinklers and
bubblers shall be adjusted for proper rate of flow and coverage. Sprinklers and/or bubblers
shall be relocated as required to produce uniform coverage.
Any revision of the proposed irrigation systems ordered by the Agency and necessary to
achieve complete and adequate coverage and operation of the system, which is not within the



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