The plan is to be submitted by the
Owner, or his engineer, to the Swalley Irrigation District
for approval. The plan shall be signed by a Registered
Professional Engineer and certified by that person to
be complete to the best of their abilities. Plans that
are not 95% complete shall not be reviewed. A copy of
any construction requirements or development conditions
levied by any public agency that are relevant to the
District facilities shall be attached to plans submitted
for review. Without the above submittal, the District
shall be unable to review the plans.
Once submitted, a minimum of two weeks
shall be required for review by the District. Once reviewed,
plans shall either be approved as submitted, reviewed
with the Design Engineer, or returned with comments.
Resubmitted plans shall be accompanied by all previously
submitted materials and any District comments to facilitate
review.
At least one reproducible mylar shall
be submitted to the District for final approval. The
Owner shall provide a copy of the plans after all signatures
have been completed. An electronic copy of the pertinent
drawings shall also be submitted in AutoCAD format on
a 3.5" disk, or CD. IBM compatible double sided/high
density format, if used, shall be on a Double Sided/High
Density Disk (2S/HD). Once approved, two copies of the
plans and application for agreements with appropriate
legals for property and easements, estimates for performance
and warranty bonding, and type of bonding shall be submitted
by the Owner to the Swalley Irrigation District for
preparation of an agreement. If construction has not
been initiated within 18 months of the approval date,
the approval shall be declared void and the plans shall
be resubmitted to the District for review. Each approved
set of plans shall be considered a complete construction
project.
Final approval of the plans by the
District and executed agreements with the Swalley Irrigation
District are required before construction may begin.
A pre construction conference shall be held on all projects
as determined by the District. All appropriate permits/fees
shall be paid as a condition of the issuance of the
'Notice to Proceed' prior to authorization by the District
to commence construction.
No changes or revisions to the approved
plans shall be considered effective without the following:
1. The
assigned District Inspector may verify and approve the
change. The inspector shall note the change on his field
drawings, or
2. For
significant changes as determined by the District, a
blue line copy, a mylar sheet and an electronic file
as requested, of the revised sheet noting the revision
shall be submitted to the District for approval. The
revision shall be noted in a revision box. Revision
approval is required prior to construction.
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AGREEMENTS
All agreements shall be signed
and paid for prior to scheduling a pre-construction
meeting and commencing construction on the associated
facility. These agreements are prepared by the District.
It is the responsibility of the Owner, or his agent,
to coordinate with the District to ensure all agreements
have been completed prior to requesting a pre-construction
meeting and start of construction.
INSURANCE
The person or firm doing the
work shall maintain Construction Public Liability Insurance
during the life of the Contract.
Minimum limit of insurance coverage
shall be as follows:
1. Workmen’s Compensation
Insurance in compliance with the laws of the Federal
Government and the State of Oregon, including Employer’s
Liability with limits of $100,000.
2. Liability insurance
of bodily injury for $1,000,000 for each person, $1,000,000
for each occurrence.
3. Property damage, $1,000,000
for each occurrence.
Insurance under (2) and (3) above
shall include Owner as additional insured.
Swalley Irrigation District shall
be held harmless from any liability of any kind resulting
from or in connection with activities connected with
the project. Swalley Irrigation District shall be named
as additional insured and a certificate of insurance
with ten day cancellation notice shall be filed with
the Swalley Irrigation District prior to start of construction.
EASEMENTS
When portions of the irrigation facility or utility
crossing or structure shall be located on private property,
the Owner shall obtain easements and permits. Easements
shall also provide for the use of property for construction
purposes to the extent indicated on the easements. The
Contractor shall make copies of these easements and
permits available to the District for inspection. It
shall confine its construction operations to within
the easement limits or street right-of-way limits or
make special arrangements with the property owners for
the additional area required. Any damage to private
property, either inside or outside the limits of the
easements provided by the Design Engineer, shall be
the responsibility of the Contractor. Before acceptance
of the work by the District, the Contractor shall be
required to furnish the Owner with written releases
from property owners where side agreements or special
easements have been made by the Contractor or where
the Contractor's operations for any reason, have not
been kept within the construction right-of-way obtained
by the Owner. All facilities requiring centerline or
other legal easement descriptions shall require the
following:
1.
All easements shall be typed on plain white 8 1/2x11
standard paper. One easement per sheet and two copies
of each easement or, submit a 3 1/2 inch disk, IBM
compatible, using Microsoft Word, containing the easement
description. (Disk shall be returned to Owner.)
2. All easements shall
be submitted with a map showing where the easement
is located in relationship to the site plan.
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PERFORMANCE
BOND
ORS 279.029 (4)(b) If the contract is for an irrigation
system improvement, execute and deliver to the Swalley
Irrigation District a good and sufficient bond, to be
approved by the Swalley Irrigation District, in a sum
equal to the related contract price for the faithful
performance of the contract. In lieu of a surety bond,
the District may permit the successful bidder to submit
a cashier's check or certified check in an amount equal
to 120 percent of the contract price.
WARRANTY
Upon acceptance of the construction by the Swalley Irrigation
District, the facilities shall be presented to the District
for acceptance of the improvements for ownership and
maintenance. Once accepted by the District, a minimum
one (1) year warranty agreement on materials and workmanship
shall be initiated between the Swalley Irrigation District
and the Developer.
The warranty shall be comprised of
a bond or other approved security in a minimum value
of 12% of the original improvement construction costs.
The performance bond may be reduced
to the warranty amount after final acceptance.
PUBLIC
NOTIFICATION
Any construction activity that impedes or interrupts
any existing public service shall require that the public
be notified of that interruption at least 48 hours prior
to such impediment or interruption. Each notification
shall be the responsibility of the Contractor performing
the work and shall be coordinated with the District
to ensure adequate notification. Failure to adequately
notify the public may result in an immediate suspension
of the contractor's activities.
INTERGOVERNMENTAL
JURISDICTION
District improvements often fall within the jurisdiction
of several governmental agencies, i.e., Deschutes County,
Oregon Department of Transportation, and other irrigation
districts. When multiple jurisdictions are involved,
it is the responsibility of the Developer, or agent,
to coordinate with and gain the appropriate approval
from the appropriate governmental agency.
It shall be the responsibility of
the construction contractor to verify said approval
with agencies prior to commencing work. Failure to verify
said approval might result in the immediate suspension
of all work.
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PRE
CONSTRUCTION MEETING
A pre construction meeting shall be held following construction
drawing approval and prior to 'Notice to Proceed' for
construction. Before the meeting can be held, agreements
must be signed and payment received by the Swalley Irrigation
District. The District must have fully signed plan copies
and acceptable electronic files of the construction
plans. Items to be discussed/supplied are:
1. Contractor's work schedule
2. Inspector assignment
3. Traffic Control/Public Notification
4. Subcontractors and suppliers
5. Materials furnished (i.e. type, brand, etc.) trench
backfill-sieve/proctor
6. Public safety requirements
7. Any work requiring inspection outside normal work
hours shall require prior coordination and advance
additional payment of $50.00/hour
No inspections shall be performed
until a pre construction meeting has been held with
the Swalley Irrigation District. At this time, an inspector
shall be assigned to the project and all communications,
changes, and field decisions shall be coordinated through
this inspector. If the inspector is unaware of the change
or field decision, then no change or field decision
has occurred and the plans as approved are binding.
UTILITIES
The construction drawing shall show the location of
all existing and proposed utilities. The owner is responsible
for the coordination of this work with any other agencies
or individuals that may in any way be involved with
the construction.
INSPECTIONS
INSPECTION: The visual observation of construction to
permit the Engineer to render his or her professional
opinion as to whether the Contractor is performing the
work in a manner indicating that, when completed, the
work shall be in accordance with the Contract Documents.
Such observations shall not be relied upon by any party
as acceptance of the work, nor shall they relieve any
party from fulfillment of customary and contractual
responsibilities and obligations.
Authorized representatives of the
District shall be appointed as inspectors for any or
all phases of the work related to the District at the
expense of the person or firm for whom the work is being
done, to ensure that the installation shall conform
to District Standards. The Owner shall provide engineering.
Contractors may call for the District, or his representative,
to check the work at Contractor's expense, when deemed
necessary by the District.
Inspections shall be conducted on
an appointment basis, and at unannounced site visits,
8:00 a.m. - 3:00 p.m. Monday through Friday, excluding
legal holidays. For any inspections outside of these
hours, the contractor may make a formal request to the
District at the time of the pre-construction meeting.
Approval will be based on the impacts to public safety
and welfare and the availability of personnel.
The Contractor shall be responsible to notify the District
office at least 48-hours in advance of required inspections.
The District shall not be responsible to conduct inspections
without sufficient notice, nor shall the District be
responsible for any cost incurred because of insufficient
notification times.
No inspections shall be performed
without 48-hour notification. Any work performed without
a required inspection shall be subject to removal at
inspector’s discretion.
Inspections shall generally include
observation of the material and storage area, all pipe,
protection measures, location and marking of utilities,
construction staking, trench, blocking, no rock point
projections, bedding, backfill, pipe alignment is true,
fittings tight, inspection of forms and rebar before
pouring concrete.
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TESTING
Prior to testing any irrigation facilities, all other
underground utilities shall be complete and in place.
The owner shall be responsible for obtaining all utility
plans from the utility companies and submitting them
to the District before commencing testing operations.
The intent of this provision is to insure that no District
facility has been disturbed by the operations of utility
companies.
Pressure Testing
1. Testing completed according to
testing procedure. (See APWA or these specifications,
as applicable) Testing shall be performed for all
irrigation pipe installations to insure a minimum
of 100 PSI service capability unless waived in writing
by the District.
CONSTRUCTION
STAKING
The purpose of this section is to define the responsibilities
for construction surveying. All survey work shall be
conducted by or under the supervision of a Registered
Professional Land Surveyor or Professional Engineer,
licensed in the State of Oregon. The Contractor shall
be responsible for providing all construction staking
as required to complete the work.
STAKES
Construction stakes and stakes which are reference points
for construction work shall be conspicuously marked.
It shall be the responsibility of the Contractor to
inform his employees and his subcontractors of their
importance and the necessity for their preservation.
The Contractor shall provide vertical
and horizontal construction staking in the proximity
of the work. Construction staking shall be provided
at 50' intervals on tangent and 25' intervals on curve.
The guard stakes should contain the following information:
Engineer's station (on back)
Offset from line (underlined)
Offset from control point (circled)
Cut or fill to grade
Distance right or left from centerline on curb stakes
(on back)
Irrigation lines shall be staked to
top of pipe by means of an offset line at the appropriate
intervals.
All structures shall be staked to the line and grade
as shown on the plans or as directed by the engineer.
MATERIALS
Materials shall conform to these Swalley Irrigation
District Standard Specifications or the APWA Standards
as applicable. Where conflicts arise between the two
specifications , Swalley standards and specifications
shall govern.
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DUST
CONTROL
Dust Control shall be performed in accordance with all
applicable city, county, state or federal regulations
and at any hour of the day and on any day of the week
that the District may determine necessary for proper
performance or protection of the work and for adequate
alleviation of dust nuisance. The owner is responsible
for the cost of dust control. If the owner is unable
or unwilling, the District shall provide charge the
owner.
WORKMANSHIP
Responsible and qualified workmen shall do the work
and shall be appropriately licensed. No work shall be
performed by individuals not appropriately licensed
and in good standing with the appropriate licensing
agency. Should the Inspector deem any worker to be unqualified,
the Contractor shall immediately replace said worker.
The Contractor shall notify the public
and local service organizations, i.e Emergency services,
school bus routes, mail routes, truck routes, in advance
of any construction activity that may impede their daily
activities and functions.
At points where the Contractor's operations
could cause damage which might result in considerable
expense, loss, and inconvenience when adjacent to or
near railway, telegraph, telephone, television, power,
oil, gas, water irrigation systems, or other private
or municipal systems, the Contractor's working operations
shall be suspended until all arrangements necessary
for the protection thereof have been made by the Contractor.
The Contractor shall notify, at least
48-hours in advance, by the one call number 1 800 332
2344, all utility offices including the Swalley Irrigation
District which are affected by the construction operation.
Under no circumstances shall the Contractor expose any
utility without first requesting permission and being
granted to do so from the affected agency. It shall
be the Contractor's responsibility, once permission
has been granted, to locate if necessary and expose
all of the existing underground utilities in advance
of the trenching operation.
It shall be the Contractor's responsibility
to protect from damage all power and telephone poles.
If interfering power poles, telephone poles, guy wires,
or anchors are encountered, the Contractor shall notify
the owner at least 48-hours in advance of construction
operations to permit the necessary arrangements with
the affected utility company for protection or relocation
of the interfering structure. The Contractor shall be
solely and directly responsible to the owner and operators
of such utilities/properties for any damage, injury,
expense, loss or inconvenience, delay, suits, actions,
or claims of any kind brought because of injuries or
damage which may result from the carrying out of the
work to be done under the Contract.
In the event of interruption to domestic
water or to other utility services as a result of accidental
breakage, or as a result of being exposed or unsupported,
the Contractor shall promptly notify the proper authority.
He shall cooperate with the said authority in restoration
of service as promptly as possible and shall bear all
costs of repair. In no case shall interruption of any
water or utility service be allowed to exist outside
working hours unless prior approval is received.
Neither the owner nor its officers
or agents shall be responsible to the Contractor for
damages as a result of the location of the underground
utilities being other than that shown on the plans or
for the existence of underground utilities not shown
on the plans.
In the event the Contractor encounters
any utility service lines that interfere with trenching,
he may by obtaining prior approval of the owner and
governing authority, cut the service, dig through, and
cause the service to be restored with similar and equal
materials at the Contractor's expense.
During the progress of construction,
it is expected that minor relocations of the work may
be necessary. Such relocations shall be made only by
direction or approval of the District.
To protect persons from injury and
to avoid property damage, adequate barricades, construction
signs, warning lights, and guards, as required, shall
be placed and maintained during the progress of the
work and until it is safe for use.
Rules and regulations of the local
State and Federal authorities regarding safety provisions
shall be observed. The Contractor shall be solely responsible
for accidents caused by inadequate or insufficient safety
provisions.
All bituminous and concrete pavements
shall be cut with a saw or other approved device prior
to asphalt patching, or concrete replacement, such that
the patching material abuts a smooth uniform, vertical
face at least twice the depth of the maximum particle
size in the patching medium. Uneven pavement edges shall
be trimmed smooth before patching the pavement.
The width of the pavement cut for
trenching shall be at least 12" wider either side
than the finished width of the trench at the ground
surface. Pavement removed during excavation shall be
kept separate from native backfill material and removed
from the site. Pavement shall not be used for excavation
backfill material.
Where existing paved roadways are
cut, trench backfill shall be as defined in the Standard
Specifications of the Swalley Irrigation District or
Deschutes County, at minimum, and as specified herein
where more conservative. The pavement section shall
be replaced equal to or better than existing, except
that in no case shall it be less than the current standard
for that classification of street. Base material must
meet current Swalley Irrigation District or Deschutes
County Specifications, as applicable.
Obstructions to the construction such
as tree roots, stumps, abandoned pilings, concrete structures,
logs, rubbish, and debris of all types shall be removed
from the right-of-way. The District may make changes
in alignment to avoid major obstructions.
The Contractor shall remove, replace
and/or repair any damage done by the Contractor during
construction to fences, buildings, billboards, irrigation
lines, roadways, cultivated fields, drainage crossings,
and any other properties. The Contractor shall replace
these structures in a condition as good or better than
their original condition.
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BLASTING
No blasting within the District right of way will be
allowed without prior written approval by the District.
Where rock must be removed within the right of way,
hydrohammering may be used.
Should approval for blasting be provided
in writing by the District, the Contractor shall furnish
all necessary approved tools, equipment, and materials
required to carry out the work. The Contractor shall
conform to all Federal, State, and local laws that may
be imposed to the storage, handling, placement and firing
of all explosives. The contractor shall submit a blasting
plan and conduct a pre blast survey of adjacent structures.
The Contractor shall furnish all additional
insurance coverage as required by the Swalley Irrigation
District, or any agency, in addition to the basic coverage
required by these specifications.
SHORING
AND SHEETING
It shall be the sole responsibility of the Contractor
to use whatever means necessary to maintain safe working
conditions and protect adjacent property and structure
from damage due to excavation. The Contractor shall
conform to all Federal, State, and local regulations
governing shoring, sheeting, and excavations.
LOCATION
OF EXCAVATED MATERIALS
During excavation the Contractor shall locate excavated
material so as not to block any public right-of-ways,
traveled roadways, public or private, and unless otherwise
approved by the District, roadways shall be kept open
to two-way traffic. The Contractor shall store or waste
excavated materials only in designated areas unless
otherwise approved by the District. Utmost care shall
be taken to prevent spillage or damage to property adjacent
to the project.
CONSTRUCTION
IN THE PUBLIC RIGHT-OF-WAY
Construction shall comply with the current edition of
the APWA-Oregon standards and specifications.
CLEAN
UP
Final irrigation system cleaning: Prior to final acceptance,
flush and clean all parts of the system both pressure
and gravity. Remove all accumulated construction debris,
rocks, gravel, sand, silt, and other foreign material
from the irrigation system affected by the work. If
necessary, use mechanical rodding or bucketing equipment.
Upon the District’s final inspection,
if any foreign matter is still present in the system,
re-flush and clean the sections and portions of the
lines as required.
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AS
BUILT DRAWINGS
The Owner, or its representative, shall prepare all
As-Built drawings, and shall periodically check the
development of the drawings with the Inspector to insure
agreement. Any change, which would appear on ‘As
Built’ drawings should be immediately brought
to the attention of the Inspector at the time the Contractor
or Engineer, discovers such discrepancy.
A final set of As-Built drawings and
the revised electronic copy shall be prepared by the
Owner and supplied to the District. As-Builts not reflecting
all changes will be returned to the Owner for revision
and resubmission to the District.
PLATS
Final Plats shall be submitted to the District for final
approval and signature. A full sized copy shall be submitted
to the District after all signatures have been completed.
When the plan has been produced electronically, the
plat shall also be submitted to the District in AutoCAD
format on a 3.5" disk.
In addition to State of Oregon requirements,
the final plat shall contain the following language
as indicated:
For Irrigation Easements -
This easement is granted to the Swalley Irrigation District
and shall be a permanent, perpetual and exclusive right
to construct, install, maintain, and operate an irrigation
line and all related facilities on the surface and within
the subsurface of the easement. No person or entity
shall be authorized to construct, erect or install any
structures or facilities on the surface or within this
easement without first obtaining approval from the Swalley
Irrigation District.
For Irrigation Access Easements -
This easement is granted to the Swalley Irrigation District
and shall be a permanent, perpetual and exclusive right
for the use, construction, installation, and maintenance
for District vehicular or pedestrian access.
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FINAL
ACCEPTANCE
Final acceptance, for purposes of these specifications,
shall mean the date the Swalley Irrigation District
formally accepts the District improvements for ownership
and maintenance.
This acceptance shall follow the
District’s acceptance of construction and shall
involve the completion of the following items (as
applicable) with the Swalley Irrigation District.
1. Bill of Sale as applicable
2. Total construction costs
3. Easements
4. Right-of-way
5. Recorded Plat or Partition
6. Warranty for workmanship
7. Verification Performance Tests (if required)
8. Lien Release
IRRIGATION
FACILITY and UTILITY CROSSING DESIGN PARAMETERS
Materials and procedures for irrigation facilities shall
conform to these Specifications of the Swalley Irrigation
District, and AWWA standards. Irrigation facilities
shall generally be installed in easements in favor of
the District, or pre-existing easements.
A. Irrigation
Pipes
1. Minimum Size
The minimum size for pipes shall be 8". All pipes,
fittings, valves, and appurtenances shall be pressure
rated for a proposed working pressure of 100 PSI,
Minimum. Pipes shall be sized based upon a District
approved hydraulic model or hydraulic calculations
performed by the Owner or its representative, but
must be performed by a Professional Engineer. Maximum
and minimum flow rates will be provided by the District
to the Owner for use in such calculations. In general,
no upstream head increase will be allowed based upon
the installation of a proposed facility.
2. Bends and Joint Deflection
All bends shall be called out on the plan and profile
by station, including size, number, and designation
(90°, 45°, 22-1/2°, 11-1/4°) of each.
In general, no bends in excess of 22½°
will be allowed. Pressure rated cleanouts will be
required upstream of bends. Bends and other fittings
shall be suitably constrained to withstand thrust.
When applicable, joint deflection shall be called
out in the number of degrees per joint and radius
of curvature when several joints in succession are
to be deflected. Deflection and pipe bending shall
be 75% of the Manufacture’s maximum.
3. Location
Irrigation mains shall be normally be centered in
the irrigation easement.
4. Valves
Valves in irrigation mains may be required at the
discretion of the District. The Owner shall coordinate
with the District regarding any main line valving
requirements and shall add such valving at the owners
cost. The specifications for such valving shall be
as indicated in these Specifications. In general,
pinch type valves shall be used for all main line
and pressurized service locations. For large mainline
pipe sections (i.e. greater than 24”), butterfly
valves may be specified by the District.
Where valves are located outside of paved areas, they
shall be set in a concrete collar In addition, utility
I.D. posts may be required.
5. Detection Tape and Wire
Detection tape shall be installed on all non metallic
main line, non metallic service line, angled or meandering
service lines, and mains and services located out
of paved easement areas. The detection tape shall
conform to the specifications of the APWA Standards.
Two courses of detection tape are required: one on
top of the pipe zone material and the second at 12"
below subgrade or ground level. Location wire shall
be fastened buy plastic adhesive tape to the top center
of the pipe. The adhesive tape shall be bounded around
both the pipe and wire at no more than 34 foot intervals.
The wire shall be continuous for the entire length
of the pipe, without gaps, breaks, etc. The wire shall
terminate above ground in a valve riser housing.
6. All Weather Access
Where irrigation facilities requiring maintenance
access lie outside paved right-of-way, a paved access
pad sufficient for service equipment to operate without
blocking the traveled way shall be constructed. Where
irrigation facilities lie away from paved right-of-way,
an all weather access road may be required by the
District at the cost of the Owner. Should such access
road be required it shall be a minimum of 14' in width
and shall be surfaced with a minimum of 4" of
compacted cinders or aggregate base. The road shall
be shaped to promote drainage and shall not cause
the ponding of storm water. Support facilities such
as but not limited to drainage structures, vehicular
turnaround, or a pad lockable gate may also be required.
B.
Measurement devices
For pressurized irrigation deliveries, a service shall
be installed on the irrigation main and a pinch valve
and McCrometer brand meter shall be installed to deliver
water to the service. For gravity deliveries, pressurized
water shall be suitably deenergized and a concrete box
and square notch weir shall be installed per District
standards. The Owner or its representative shall be
responsible for initially sizing the services and submitting
to the District for approval.
C. Structures
1. General
Structures such as headwalls, tailwalls, bank reinforcement,
channel liners, rip-rap, and other such civil works
may be required in conjunction with the proposed work.
2. Location
The location and design of such structures is subject
to District discretion and approval.
D.
Bridge Crossings
Any and all crossings of District facilities are subject
to permit by the District. In general, such crossings
shall be subject to design by a Professional Engineer
at the cost of the Owner. Generally, piping sections
of open canal for the purposes of crossing are more
preferable to the District than bridging. Should a bridge
alternative be approved by the District, the bridge
shall be designed by a Structural Engineer licensed
in the State of Oregon and shall provide enough clearance
for the installation of future District piping facilities
and for the passage of District maintenance equipment
as necessary. The bridge shall also be designed to span
the entire District facility and beyond its margins
to the satisfaction of the District. The bridge shall
be designed with suitable geotechnically engineered
abutments and deck load to satisfy ODOT H-20 type loads.
E. Piped
Crossings
Piped crossings of District facilities shall be designed
so as to accommodate the maximum flow of the District’s
facilities and to comply with the District’s comprehensive
system plans. Materials and methods for installation
of such crossings shall comply with these Specifications.
Suitable reinforced concrete inlet and outlet structures
shall also be designed and installed. All such designs
are subject to District approval and modification prior
to construction.
F. Utility Crossings
Any and all utility crossings are subject to the review
and approval of the District in addition to all provisions
and requirements indicated herein. Utility crossings
of District canal facilities shall comply with the attached
“Typical Canal Crossing Detail” unless otherwise
directed by the District. This detail shall be incorporated
into the construction documents for the proposed work.
For utility crossings of District pipe facilities, specific
designs shall be submitted for District review. Where
such crossings are perpendicular, generally 12”
minimum clearance will be required and an approved flowable
backfill may also be required.
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APPENDIX
A
IRRIGATION FACILITIES
401 TRENCH EXCAVATION, BEDDING AND
BACKFILL
401.1.00 DESCRIPTION
Minimum general standards for irrigation facilities
shall be set forth in the current American Water Works
Association Standards and 1990 APWA Standard Specifications
and 1992 revisions. The following special provisions
are minimum construction standards for the Swalley
Irrigation District and are intended as a supplement
to the above standards.
Pumice and cinders are not acceptable
trench foundation, pipe bedding, pipe zone or trench
backfill material. Any backfill material less than
90.0 pcf shall only be approved by the District prior
to the Pre-Construction meeting. Such approval may
require additional testing and compaction requirements
and be project specific. No material less than 80.0
pcf based on AASHTO T-99 (standard proctor) will be
approved.
401.2.00 MATERIALS
401.2.01 TRENCH FOUNDATION
The trench foundation shall be undisturbed material.
Where ground water or other unstable conditions exist
and the native material cannot support the pipe, additional
excavation may be required. The trench shall be stabilized
with pipe bedding material.
401.2.02 PIPE BEDDING
Pipe bedding material for irrigation pipes and structures
shall be as shown on the plans or as directed by the
Engineer. Pipe bedding shall meet the requirements
for ODOT ¾”-0 backfill. Samples of the
proposed material, along with technical information
such as gradation, Proctor Test results, certifications,
etc., shall be submitted to the Engineer for approval
prior to construction.
401.2.03 PIPE ZONE
Pipe zone material for irrigation pipes and structures
shall be as shown on the plans or as directed by the
Engineer. Unless otherwise specified, pipe zone material
shall conform to the requirements for pipe bedding.
For traveled crossings and in higher load areas, an
ODOT Class B type Sand Cement Slurry pipe zone backfill
may be required. Samples of the proposed material
shall be submitted to the Engineer for approval prior
to construction.
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401.2.04 TRENCH BACKFILL
Material used for normal backfilling shall be earth,
gravel, rock or combinations thereof, free of humus,
organic matter, vegetable matter, frozen material,
clods, sticks, and debris. The backfill material shall
predominate in the finer sizes and, in place, shall
present no isolated points or areas of larger stones,
which would cause fracture or denting of the utility
or structure or subject it to undue stress.
Trench backfill shall consist of
the following material:
401.2.04A Class A Backfill
Class A backfill shall be native or common material
which is acceptable to the Engineer. The intent of
this specification is that material excavated on the
site be used for backfill after being screened on
a 3" screen. Class A backfill shall meet the
following:
1. No rock has a dimension of greater than 3".
2. Material larger than 1½" minimum dimension
shall not exceed 10% of the backfill.
401.2.04B Class B Backfill
Class B backfill shall be ¾”-0 aggregate
base material conforming to Oregon Department of Transportation
(ODOT) specifications.
401.2.04C Class C Backfill
Class C backfill shall be clean sand with no particle
size larger than ¼” and no more than
10% by weight of material passing a 200 sieve or well
graded ¾”-0 granular material with no
more than 10% by weight passing a 200 sieve which
shall include commercial base rock and pit run or
screened native, granular, well graded material acceptable
to the Engineer.
401.2.04E Cement Treated Base (CTB)
Cement Treated Base shall conform to the requirements
of the Oregon Department of Transportation. It shall
contain 4.5% to 5.5% cement by weight (1 to 2 sacks
of cement per ton).
401.2.04F Concrete Backfill
Concrete backfill shall conform to ASTM C-94. Alternate
3. Proportion cement (minimum 5 sack mix) to obtain
a 28-day compressive strength of 2500 psi.
401.2.04G Sand Cement Slurry (SCS)
Sand Cement Slurry shall conform to the requirements
of the Oregon Department of Transportation specification
for class B bedding. Sand Cement Slurry shall consist
of at least 3/4 sack of Portland cement per cubic
yard of sand plus water, with a 7-inch slump, plus
or minus 1-1/2 inches.
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401.3.00 CONSTRUCTION
401.3.01 TRENCH EXCAVATION
401.3.01A General
The Contractor shall secure and comply with applicable
State, County, or District Street cutting permits.
The Contractor shall comply with all District, County,
State and Federal Highway Construction Safety and
Health Standards. Prior to installing a irrigation
facility in an unimproved street, the street shall
be brought to subgrade to ensure that adequate bury,
depth of cover, and utility separation is acquired.
401.3.01D Trench Width and Depth
The trench depth and width at the bottom shall be
below the profile showing finish elevations as indicated
by the approved plans. The top of the ditch shall
be 6" wider and meet all safety standards unless
otherwise agreed upon by the District Engineer, or
his representative.
In general, the trench shall be
configured to provide a minimum of 36” of cover
and 12” minimum width on each side of the pipe
to allow for pipe zone material installation.
401.3.05 PIPE BEDDING
The trench shall be excavated to a minimum depth of
7" below the pipe to provide minimum bedding.
Over excavation shall be backfilled and compacted
with pipe zone material to a grade of 4" to 7”
below the pipe bell as specified below. The pipe bedding
shall be uniform, at grade, and compacted prior to
placing pipe.
401.3.06 PIPE ZONE
Pipe zone material shall be as specified in 401.2.03.
The specified bedding material above, around, and
below pipe shall be carefully and thoroughly tamped
in layers not exceeding 6" so that the fill is
fully compacted to 95.0% of AASHTO T 99 74 Method
C.
401.3.07 TRENCH BACKFILL
Trench backfill of facilities in existing paved streets
or concrete areas shall be as per the approved design.
Trench backfill in all other areas shall be in accordance
with Section 401.2.04 and shall be carefully and thoroughly
tamped in layers so that fill is fully compacted to
95.0% of AASHTO T-99-74 Method C.
401.3.11 COMPACTION TESTING
Trench backfill shall be tested at one passing test
for each 6' of fill and 50 LF of trench (e.g. 12'
to 15' depth class shall require 3 tests per 50 LF)
or as directed by the District. Passing test shall
meet the requirements for trench compaction in that
segment of trench backfill. All sampling and testing,
including material certifying tests, shall be performed
by an independent testing laboratory. Sampling locations
shall be determined by the Swalley Irrigation District.
All results, including failing tests, shall be submitted
to the Swalley Irrigation District prior to any subgrade
inspection.
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402 IRRIGATION PIPE AND FITTINGS
402.1.00 DESCRIPTION
402.1.01 GENERAL
This section covers the work necessary for furnishing
and installing irrigation pipe and fittings normally
used for irrigation systems.
402.1.02 CERTIFICATION
The Contractor shall furnish material certifications.
402.1.03 CORROSION PROTECTION
The method of corrosion protection shall be as specified
when required.
402.2.00 MATERIALS
Where more than one type of material is specified,
the type required shall be designated on the plans.
Material used on pump station, meter vault or control
valve applications shall be approved by the District
on a case-by-case basis. All appurtenances shall be
of same manufacture. All material shall be manufactured
or produced in the United States of America.
All irrigation District piping and
appurtenant systems installed shall be pressure rated
to withstand 100 PSI working pressure. SDR 17 HDPE
fusion welded pipe shall be the sole alternative for
system piping. Specifications for HDPE shall be as
follows.
402.2.02 HIGH DENSITY POLYETHYLENE
PIPE (HDPE) FUSION WELDED PIPE
DESCRIPTION: The work in this section
consists of providing High Density Polyethylene (HDPE)
pipe and fittings.
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QUALITY ASSURANCE: References, American
National Standards Institute (ANSI), American Society
for Testing and Materials (ASTM), Federal Specifications
(FS), International Standards Organization (ISO),
and manufacturer’s printed recommendations.
SUBMITTALS: Material list naming each product to be
used identified by manufacturer and type number, in
accordance with Section 01300.
PRODUCT HANDLING: Handle pipe and
fittings to insure delivery in a sound undamaged condition.
JOB CONDITIONS: Do not lay pipe when trenches or weather
conditions are not suitable for such work.
MATERIALS
PIPE:
Pipe shall be manufactured from
a PE 3408 resin listed with the Plastic Pipe Institute
(PPI) as TR-4. The resin material will meet the specifications
of ASTM D3350-99 with a cell classification of PE:345464C.
Pipe shall have a manufacturing standard of ASTM F714.
Pipe shall be DR 17 (100psi WPR) unless otherwise
specified on the plans. The pipe shall contain no
recycled compounds except that generated in the manufacturer's
own plant from resin of the same specification from
the same raw material.
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FITTINGS:
Butt Fusion Fittings - Fittings shall be PE3408 HDPE,
Cell Classification of 345464C as determined by ASTM
D3350-99. Butt Fusion Fittings shall have a manufacturing
standard of ASTM D3261. Molded & fabricated fittings
shall have the same pressure rating as the pipe unless
otherwise specified on the plans. Fabricated fittings
are to be manufactured using a Data Logger. Temperature,
fusion pressure and a graphic representation of the
fusion cycle shall be part of the quality control
records.
Electrofusion Fittings - Fittings
shall be PE3408 HDPE, Cell Classification of 345464C
as determined by ASTM D3350-99. Electrofusion Fittings
shall have a manufacturing standard of ASTM F-1055.
Fittings shall have the same pressure rating as the
pipe unless otherwise specified on the plans.
Flanged and Mechanical Joint Adapters
- Flanged and Mechanical Joint Adapters shall be PE
3408 HDPE, Cell Classification of 345464C as determined
by ASTM D-3350. Flanged and Mechanical Joint Adapters
shall have a manufacturing standard of ASTM D-3261.
Fittings shall have the same pressure rating as the
pipe unless otherwise specified on the plans.
EXECUTION
GENERAL:
Pipe and Fittings: Size as indicated
on the plans. Install as shown in accordance with
manufacturer’s recommendations.
HAULING, UNLOADING and DISTRIBUTING
PIPE: During loading, transporation and unloading,
every precaution shall be taken to prevent injury
to the pipe. No pipe shall be dropped from cars or
trucks, or allowed to roll down slides without proper
retaining ropes. During transportation each pipe shall
rest on suitable pads, strips, skids or blocks securely
wedged or tied in place. Any pipe damaged shall be
replaced.
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FUSION:
Sections of polyethylene pipe should
be joined into continuous lengths on the jobsite above
ground. The joining method shall be the butt fusion
method and shall be performed in strict accordance
with the pipe manufacturer's recommendations. The
butt fusion equipment used in the joining procedures
should be capable of meeting all conditions recommended
by the pipe manufacturer, including, but not limited
to, temperature requirements of 400 degrees Fahrenheit,
alignment, and an interfacial fusion pressure of 75
PSI. The butt fusion joining will produce a joint
weld strength equal to or greater than the tensile
strength of the pipe itself. All field welds shall
be made with fusion equipment equipped with a Data
Logger. Temperature, fusion pressure and a graphic
representation of the fusion cycle shall be part of
the Quality Control records.
Sidewall fusions for connections to outlet piping
shall be performed in accordance with HDPE pipe and
fitting manufacturer’s specifications. The heating
irons used for sidewall fusion shall have an inside
diameter equal to the outside diameter of the HDPE
pipe being fused. The size of the heating iron shall
be ¼ inch larger than the size of the outlet
branch being fused.
Mechanical joining will be used where the butt fusion
method can not be used. Mechanical joining will be
accomplished by either using a HDPE flange adapter
with a Ductile Iron back-up ring or HDPE Mechanical
Joint adapter with a Ductile Iron back-up ring.
Socket fusion, hot gas fusion, threading, solvents,
and epoxies will not be used to join HDPE pipe.
INSPECTION:
Inspect the pipe for defects before installation and
fusion. Defective, damaged or unsound pipe will be
rejected.
TESTING:
Hydrostatic testing shall be in
accordance with the testing sections of these specifications
and as more stringently required by the manufacturer.
402.2.22 CONCRETE FOR THRUST BLOCKING.
Concrete for thrust blocking and hydrant support shall
conform to ASTM C 94, Alternate 2 and shall be proportioned
to obtain a 28 day compressive strength of 2500 pounds
per square inch or approved equal. "Sacrete"
type products are not allowed.
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402.3.00 CONSTRUCTION
402.3.01 HANDLING AND STORAGE
All material shall be handled with care to avoid damage.
Whether moved by hand, skidways, or hoists, material
shall not be dropped, bumped, or allowed to impact.
The Contractor shall provide safe
storage for material until it has been incorporated
into the completed project. Storage shall be on skids
off of the ground. It shall not be strung on job more
than one shift. The interior of all pipe, couplings,
rings, fittings, and other accessories shall be kept
free from dirt and other foreign matter at all times.
Valves shall be drained and stored in such a manner
that shall protect them from damage by freezing. Material
that is supplied by the Contractor and rejected at
the point of delivery because of defects or damage
shall be replaced by the Contractor. Material damaged
subsequent to acceptance by the District shall be
replaced by the Contractor.
402.3.02 INSTALLATION, ALIGNMENT
AND GRADE
All pipe shall be laid to and maintained at the lines
and grades required by the District. Fittings, valves,
and air vents shall be installed at the required locations
with joints centered, spigots home, and valve stems
plumb. No deviation shall be made from the required
line and grade without approval from the Engineer
or his representative.
Pipe shall be laid on supports of
wood blocking of a size adequate to hold the pipe
in alignment and to maintain a 7" minimum clearance
from coupling to the surface of the pipe bedding.
Wood blocking shall be used in a consistent manner
throughout the project so as to lessen the possibility
of differential settlement, i.e. support types shall
not be mixed. Each pipe shall be laid on two supports
with center of each support placed one fifth of the
pipe length from each end.
402.3.03 FITTINGS, COUPLINGS, AND
JOINTS
402.3.03A Setting Valves and Fittings
Valves, fittings, plugs, and caps shall be set and
jointed in pipe in the manner described within these
specifications or by the approval of the District,
or his representative.
402.3.03B Pipe
HDPE pressure rated pipe shall be laid and jointed
in strict accordance with the manufacturer's recommendations
and shall be in accordance with the requirements of
these Specifications.
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402.3.03C Installation of Mechanical
and Flexible Couplings
Mechanical and flexible couplings shall be provided
where indicated on the plans and shall be installed
in accordance with the manufacturer's recommendations
as approved by the Inspector. Before couplings are
installed, the end of the pipes shall be thoroughly
cleaned of oil, scale, rust, and dirt for a distance
of at least 8 inches back from the end to provide
a seat for the coupling gaskets. Care shall be taken
that the gaskets are wiped clean before they are installed.
If necessary, they may be lubricated with pipe lubricant
for installation on the pipe ends. Coupling bolts
shall be tightened progressively, drawing up bolts
on opposite sides a little at a time until all bolts
have a uniform tightness. Workmen tightening bolts
shall be equipped with torque limiting wrenches or
other approved wrench type. Mechanical and flexible
couplings shall be tested when the tests on the adjacent
pipe are made. In the event the couplings do not pass
the requirements of the leakage tests, the couplings
shall be removed and reassembled on the pipe, and
the leakage test shall be repeated. For pipe sizes
not listed, maximum deflection shall be one half the
manufactures’ maximum deflection.
402.3.03G
Thrust Restraint
Suitable thrust restraint shall be installed for the
entire pipeline system as a whole. Tie rods, mega-lug,
thrust blocking or other suitable method shall be
used as approved by the District and as designed by
a Prefessional Engineer licensed in the State of Oregon.
402.3.03I Tapping
Tapping of District mains shall be done when the air
temperature is 35F and rising. When the air temperature
is between 20F and 35F, taps may be permitted by the
Engineer if the tapping bit is protected and heated
to 35F or above. If a heated tapping bit is used,
the work must be backfilled immediately upon completion.
IRRIGATION MAIN EXFILTRATION
Hydraulic leakage testing shall
be performed for all irrigation system facilities
installed. Leakage shall not exceed the APWA testing
requirements or those of the pipe manufacturer whichever
is more stringent. The Owner shall provide a testing
plan prior to testing for District approval.
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402.3.04 LEAKAGE/HYDROSTATIC TESTING
402.3.04A Leakage
Leakage shall be defined as the quantity of water
necessary to restore the specified test pressure at
the end of the test period. No pipe installation shall
be accepted until the leakage is less than the number
of gallons per hour as determined by the APWA or manufacturer,
whichever is more stringent. No piping or jointing
having visual leakage shall be accepted.
402.3.04B Hydrostatic Tests
The test shall be conducted on buried pipe after the
trench has been backfilled. If partial backfill (spot
load) is desired, Contractor shall be responsible
for securing pipe during test. Where any section of
pipe is provided with concrete thrust blocking the
pressure test shall not be made until at least 5 days
have elapsed after the concrete reaction blocking
is installed. If high early cement is used for the
concrete thrust blocking, the time may be cut to 2
days instead of the 5 previously specified.
Duration of the test shall be determined
by the District, but not less than one hour, with
an allowable leakage not greater that the figure calculated
off the Irrigation Main Exfiltration Table. All leaks
shall be repaired before the pipe trench is completely
accepted.
Any and all testing necessary for final acceptance
may be performed by a certified individual under the
supervision of the Swalley Irrigation District.
402.3.06 LEAKAGE/HYDROSTATIC TESTING
PROCEDURES
402.3.06A Scope
Prior to testing any irrigation facilities, all other
underground utilities shall be complete and in place.
The owner shall be responsible for obtaining all utility
plans from the utility companies and submitting them
to the District prior to commencing testing operations.
The intent of this provision is to insure that no
District facility has been disturbed by the operations
of utility companies.
The testing of irrigation lines for conformance with
the requirements for the Swalley Irrigation District
shall be the responsibility of the Contractor. This
testing includes flushing, and pressure testing. The
Owner shall run all tests according to approved procedures.
The District Representative shall monitor and observe
all testing procedures.
402.3.06B Certification
The Contractor or his employee shall be approved by
the Swalley Irrigation District. This person shall
be present at and shall supervise all phases of these
procedures.
Prior to conducting tests, the Contractor shall also
demonstrate his experience with such testing to the
satisfaction of the District.
402.3.06C Procedures
Testing procedures shall be conducted during normal
District working hours, 7:30 AM to 3 PM, Monday through
Friday. Pressure testing shall be scheduled so completion
shall be within these normal working hours. Pressure
tests shall not be performed when the temperature
is or is expected to be less than 33 degrees F between
the hours of 10 AM and 5 PM.
The Contractor shall be responsible
for providing its own testing and flushing water.
402.3.06D Flushing
The Contractor shall be responsible for all flushing
activity, including but not limited to flushing air
from service and main lines and as directed by the
District's representative. Irrigation system flushing
procedures shall meet Department of Environmental
Quality disposal and discharge methods and requirements.
The Contractor shall thoroughly
flush all lines. Flushing velocity shall not be less
than 2 fps.
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402.3.06E Pressure Testing
Prior to pressure testing, any and all air shall be
flushed from system. The District Representative shall
witness all valves being checked to be open, and all
service stops and hydrants securely closed.
Pressure testing should be done from the high end
of the main unless otherwise directed by the Swalley
Irrigation District. The test pressure shall be 150
PSI, for a period of not less than one hour unless
otherwise specified by the manufacturer.
402.3.06F Cleanup
Upon completion of the testing and acceptance of the
tests by the Swalley Irrigation District, the Contractor
shall clean the area as directed by the District.
402.3.07 HOT TAPS
When appropriate and/or shown on the plans, branches
and large services may be tied to existing Swalley
Irrigation District facilities by utilizing a tapping
sleeve and tapping valve. The performance of this
procedure shall be performed only by a District approved
contractor and said approval shall be obtained from
the District Engineer, or his authorized representative,
48 hours in advance of performing the hot tap. No
pipe shall be exposed without a District representative
on site.
All hot taps shall be air tested
prior to start of tap.
Hot taps shall be scheduled only
during the hours of 7:30 am to 3:30 pm, Monday through
Friday. No hot taps on Swalley Irrigation District
facilities shall be conducted in cold weather until
the air temperature is 35 degrees F and rising.
402.3.09 THRUST BLOCKING
402.3.09A Thrust Blocking Materials
The materials used for concrete shall conform to the
requirements of the Standard Specifications. The proportions
and mix design shall be such that the concrete shall
develop a minimum strength of 2,500 PSI at 28 days.
402.3.09B Anchorage
a. Limiting Pipe Diameter and Degree of Bend
On all pipe lines 6 inches in diameter or larger,
all tees, plugs, caps, 11 1/4? or greater bends, and
other locations where unbalanced force exist, shall
be securely anchored by suitable thrust blocking as
shown on the Plans or hereinafter specified.
b. Thrust Blocking
Reaction or thrust blocking shall be placed as shown
on the Plans and shall consist of concrete. Blocking
shall be placed between the undisturbed ground and
the fitting to be anchored. The quantity of concrete
and the area of bearing on the pipe shall be as shown
on the Plans or directed by the Inspector. The blocking
shall be placed so it shall not obstruct repairs to
the joint, unless specifically shown otherwise on
the Plans. The pipe and fitting joints shall be wrapped
with plastic sheeting before pouring.
402.3.09C Metal Harness
Metal harness of tie rods or clamps of adequate strength
to prevent movement may be used instead of concrete
blocking as directed by the Inspector. Steel rods
or clamps shall be galvanized or otherwise rustproof
treated as shown on the Plans or directed by the Inspector.
See Plate III for Thrust Blocking Details.
402.3.09D Existing Thrust Blocks
No existing thrust blocks shall be removed by Contractor
unless a Swalley Irrigation District representative
is on site for inspection and coordination.
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402.3.10
DEADMAN TABLE
Deadman requirement:
1) Able to withstand twice test pressure 360 PSI
403 VALVES AND METERS
403.1.00 DESCRIPTION
403.1.01 GENERAL
This section covers the work necessary for furnishing
and installing valves and meters.
403.2.00 MATERIALS
403.2.01 PINCH VALVES
Valves for individual services and mainlines up to
12” in diameter shall be pinch type valves.
Pinch valves shall be pressure rated to 100 PSI minimum
working pressure, shall be properly supported as per
manufacturers recommendations, and shall be installed
in a valve box suitable for the location with access
lid and room around the valve to maintain it (ie.
12” minimum on all sides). Valves shall be as
per Flexible Valve corporation Series 2100, Series
7250, or Red Valve series 75 or 70.
403.2.02 BUTTERFLY VALVES
Valves for main line exceeding 12” in diameter
shall be butterfly type and shall meet the strength
and performance characteristics of AWWA C 504 latest
revision, Class 150 B mechanical joint etc., except
worm gear operators are not permitted. To reduce the
number of different valves in the system, M&H
4500, American Flow Control, Mueller and Pratt Groundhog
are to be used exclusively.
Above ground or in vault butterfly
valves shall be equipped with hand wheels.
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403.2.03 VALVE BOXES
The appropriate size and access type Utility Vault,
Jensen Vault or Tyler Vault shall be used for valve
access.
For buried butterfly valves, only,
valve boxes shall be a two piece Tyler Series 6855
cast iron grade adjustable box. The valve box shall
have 5" I.D. with a slip top section without
a dirt flange on the bottom as shown in the Standard
Drawings.
The Tyler Series 6855 extension piece or an approved
alternate of Ductile Iron Valve Box Top #931, as manufactured
by Olympic Foundry, Inc., shall be of the proper length
for depth of cover. The word “IRRIGATION”
shall be cast into the top of the lid.
403.2.04 OTHER VALVES
Shall be designed for the specific
application and submitted for District approval.
