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Section 1 - General

1.1 Summary

  1. This section includes the installation of an irrigation system for areas shown on the Drawings. Components to be installed include, (but not limited to) tap to primary main water line, irrigation controllers, main line, sprinkler heads, drip line, automatic drain valves, manual drain valves, drip zone manual valves, air vacuum relief valves, flow sensor, control wiring, fittings, electrical connections, zone valves, filters, pressure indicator flags, manual gate valves, reduced pressure backflow preventer, sleeves under paving, boring under paving, piping, wire decoders, sensors, tree protection, disturbed turf areas, warning tape, trace wire, and all necessary accessories to provide a complete operational system.
  2. Contractor shall become familiar with the existing site conditions, existing irrigation system within the project area, and other construction activities. Coordinate with the Owner’s Representative on current construction activities, utilities, and other construction trades.

 

1.2 References

  1. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM):
    1. D1785-83 - Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40 and Class 200
    2. D2241-84 -Poly (Vinyl Chloride) (PVC) Plastic Pipe (SDR-PR)
    3. D2287 -Nonrigid Vinyl Chloride Polymer and Copolymer Molding and Extrusion Compounds
    4. D2466-78 - Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40
    5. D2564-80 -Solvent Cements for Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings
    6. D2855-83 -Making Solvent-Cemented Joints with Poly (Vinyl Chloride) (PVC) Pipe and Fittings
    7. D3139-84 -Joints for Plastic Pressure Pipes Using Flexible Elastomeric Seal
  2. NATIONAL STANDARD PLUMBING CODE.
  3. NATIONAL ELECTRIC CODE.

 

1.3 Definitions

 

1.4 Design Criteria

 

1.5 Quality Assurance

A. Irrigation Contractor shall be a single firm with over seven (7) years of documented experience in all aspects of irrigation work; irrigation maintenance and capable of installing a two wire irrigation system of this scope. Two wire manufacturer’s representative shall provide assistance to irrigation contractor to successfully execute the proper installation of a complete and operational two wire irrigation system. System shall be installed according to the specification requirements.

B. General: Irrigation contractor shall install all elements of the irrigation system including irrigation controller, pipe sleeving, piping, heads, valves, wiring, valve boxes, decoders, gate valve, backflow preventer and other items necessary to operate the system.

 

1.6 Work Coordination

A. Scheduling and Existing Information:

1. Schedule and coordinate to facilitate the most expeditious completion of the project in a workmanlike manner.
2. The Contractor shall assume responsibility for locating all site utilities, and perform work in a manner to avoid damage.

 

1.7 Submittals

 

1.8 Delivery, Storage, and Handling

A. Deliver, unload, store, and handle materials, packaging, bundling, products in dry, weatherproof, condition in manner to prevent damage, breakage, deterioration, intrusion, ignition, and vandalism. Deliver in original unopened packaging containers prominently displaying manufacturer’s name, volume, quantity, contents, instructions, and conformance to local, state, and federal law. Remove and replace cracked, broken, or contaminated items or elements prematurely exposed to moisture, inclement weather, snow, ice, temperature extremes, fire, or jobsite damage.

B. Handling of PVC Pipe Exercise care in handling, loading, and storing of PVC pipe. All PVC pipe shall be transported in a vehicle which allows length of pipe to lie flat so as not to subject it to undue bending or concentrated external loads. All sections of pipe that have been dented or damaged shall be discarded, and if installed, shall be replaced with new piping.

 

1.9 Protection of Existing Conditions

A. Any existing structures, equipment, utilities, pavement, irrigation zones (not within the limits construction), existing and proposed landscaping, etc., damaged by the Contractor during the course of the work, including any subsequent damage caused by equipment activity, leakage or settling of piping shall be restored at the Contractor's expense and to the Owner’s satisfaction.

B. Preserve and protect all trees, plants, monuments, structures, and paved areas from damage due to work of this section. In the event damage does occur, all damage to inanimate items shall be completely repaired or replaced by to satisfaction of owner, and all injury to living plants shall be repaired by owner. All costs of such repairs shall be charged to and paid by Contractor.

C. Protect buildings, walks, walls, and other property from damage. Flare and barricade open ditches. Damage caused to asphalt, concrete, or other building material surfaces shall be repaired or replaced at no cost to the owner. Restore disturbed areas to original condition.

 

1.10 Warranty/Guaranty

A. Manufacturer shall warrant materials against defects for a period of one or more years from date of substantial completion. Installer(s) shall guaranty workmanship for similar period.

B. Settling of backfilled trenches which may occur during guaranty period shall be repaired at no expense to owner, including complete restoration of damaged property.

C. Expenses due to vandalism before substantial completion shall be borne by Contractor.

D. Owner will maintain existing turf and planting areas during warranty period, so as not to hamper proper operation of irrigation system.

 

1.11 Extra Materials

A. Ten MPR (Matched precipitation rate) multi stream rotor heads with nozzles of each type used

B. Four rotor heads of each type used.

C. Two quick valve keys with swivel hose ells.

D. Reclaimed drip irrigation tubing (200’)

 

Section 2 - Products

2.1 General

 

2.2 Concrete

 

2.3 Steel Reinforcement

A. All reinforcing steel shall be deformed bars and shall conform to the requirements of the Standard Specifications for Deformed and Plain Billet Steel Bars for Concrete Reinforcement, ANSI/ASTM A615, for grade 40 or grade 60. All steel shall be manufactured in the United States. All reinforcing steel used on this project shall be Grade 60.

B. The Owner’s Representative reserves the right to require a test of three specimens of each size of bar from each carload received. A laboratory shall make these tests or testing firm approved by the Owner’s Representative and the cost of such testing shall be included in the price bid for steel reinforcement.

 

2.4 Strength and Proportion

A. The concrete shall have a compressive strength of not less than three thousand pounds per square inch, unless otherwise specified in the plans, as determined from test cylinders at twenty-eight days, made, cured, and broken, as hereinafter specified.

B. The concrete shall be mixed in the approximate proportion of 1:2-1/2:4-1/4 and shall contain not less than 5 sacks of cement per cubic yard of finished concrete. With the approval of the Owner’s Representative, admixtures may be added in order to increase workability.

 

2.5 Ready Mixed Concrete

A. Ready-mixed concrete may be used on the work, with the approval of the Owner’s Representative, when the Contractor can demonstrate that the concrete can be furnished in accordance with the specifications hereinabove and that delivery can be made at such rate as will insure the continuity of any pour. Standard Specifications for Ready-Mix Concrete, ANSI/ASTM C94, when not in conflict with the specifications herein, shall control the furnishing of ready-mix concrete.

B. All mixer trucks shall be equipped with water meters. Additional water shall be added at the job site only with the specific approval of the Owner’s Representative.

C. Construction joints shall be located as shown on the drawings and at other points as may be necessary during the construction, provided that the location and nature of additional joints shall be approved by the Owner’s Representative, in general, joints shall be located at points of minimum shear, shall be perpendicular to the principal lines of stress, and shall have suitable keys having areas of approximately one-third of the area of the joints.

D. In resuming work, the surface of the concrete previously placed shall be thoroughly cleaned of dirt, scum, laitance, or other soft material, and shall be roughened. The surface shall then be thoroughly washed with clean water and covered with at least one-half inch of cement mortar, after which concreting may proceed. Mortar shall be placed in a manner in order not to splatter forms and reinforcing steel.

 

2.6 Ductle Iron Fittings for PVC Mainline Pipe

A. Fittings for C905/DR18 mainline pipe shall be cast or ductile iron. Cast iron and ductile iron fittings shall conform to the American National Standard for Ductile-Iron and Gary-Iron Fittings, 3-inch through 48-inch, ANSI/AWWA C110; or the American National Standard for Ductile-Iron Compact Fittings, 3-inch through 12-inch, ANSI/AWWA C153. The length of all solid sleeves (both AWWA C110 and C153) shall be the longest length listed in the AWWA C110 specification (12-inch length for 3-inch through 12-inch sleeves, 15-inch length for 14-inch through 24-inch sleeves, and 24-inch length for 30-inch through 48-inch sleeves).
Fittings manufactured by: Tyler, US, Sigma, American Darling, or equal are permitted.

 

2.7 Joints for C905/DR18 Mainline

A. C905/DR18 mainline pipe fittings shall be jointed with any of the end types as specified below, unless a particular end type is specified. Fittings shall have mechanical joints, unless otherwise specified.

B. Mechanical joints shall conform to, and be tested in accordance with, the American National Standard for Rubber Gasket Joints for Ductile-Iron and Gray-Iron Pressure Pipe and Fittings, ANSI/AWWA C111/A21.11.

C. Tapping sleeves manufactured by Smith Blair and Powerseal are permitted.

D. Where restrained joints are specified or required, they shall be a wedge action type mechanical restrained joint assembly equal to the MEGALUG design for the specific type of pipe being used. Set screw type retainer glands will not be permitted.

 

2.8 Polyvinyl Chloride (PVC) Pipe, Water Pipe, and Fittings

 

2.9 Sand for Cushion or Backfill (6"C905/DR18 PVC Mainline Pipe)

A. Sand shall be a SW or SP classification according to ASTM, free from objectionable material. One hundred per cent shall pass a three-quarter inch screen, and ninety-five per cent shall pass a number four screen.

 

2.10 Drip Irrigation System

 

2.11 Sprinkler Heads

 

2.12 Valves

 

2.13 Gate Valves for C905/DR18 Primary Mainline

A. Where gate valves are specified or required, they shall conform to, and be tested in accordance with, the AWWA Standard for Gate Valves, 3-inch through 48-inch, Nominal Pipe Size, for Water and Sewage Systems, ANSI/AWWA C500. Gate valves shall have double disc parallel seats, non-rising stem, vertical mounting “O” ring stem seal, counter-clockwise opening, and ends to fit the pipe or fitting to which attached (mechanical).

B. Only the following makes of gate valves will be permitted: Mueller or American Darling.

C. Where resilient seated gate valves are specified or required for waterworks distribution service, they shall conform to and be tested in accordance with the AWWA Standard for Resilient Seated Gate Valves, 3” through 12” nominal pipe size, Water and Sewer Systems, ANSI/AWWA C509. The valve shall be bubble tight from either direction at a rated design working pressure of 200 psi. The valve shall have a single disc gate with synthetic rubber seat bonded or mechanically attached to the disc; non-rising stem with 2” AWWA operating nut; counter clockwise opening, “O” ring stem seals, corrosion resistant interior coating acceptable for potable water; and end to fit the pipe or fitting to which is attached (mechanical).

D. Only the following makes of resilient seated gate valves will be permitted: Mueller or American Darling.

 

2.14 Air Relief Valves and Combination Valves

A. Where air relief valves are specified or required, the valve shall be heavy-duty combination air release and vacuum type for 150 psi working pressure, tested to 300 psi, size shown on plans. Body, cover, and baffle shall be cast or ductile iron. All internal parts to be either highest quality stainless steel or bronze, and the inside of valve coated with rust inhibitor.

B. Combination air and vacuum valves shall be designed to allow large quantities of air to escape out of the orifice when filling a pipeline and to close watertight when the liquid enters the valve. The air and vacuum valve shall also permit large quantities of air to enter through the orifice when the pipeline is being drained to break the vacuum. An automatic air release valve shall be mounted on the combination valve body to allow air to escape under pressure. The discharge orifice area shall be equal or greater than the inlet of the valve. The valve shall consist of a body, cover, baffle, float and seat. The baffle will be designed to protect the float from direct contact of the rushing air and water to prevent the float from closing prematurely in the valve. The seat shall be fastened into the valve cover without distortion and shall be easily removed if necessary. The float shall be stainless steel designed to withstand 1000 psi or more. The float shall be center guided for positive seating. The body and cover shall be cast iron with a stainless steel float and a buna-N seat.

C. Only the following makes will be permitted: APCO,VAL-MATIC, and BERMAD.

 

2.15 Backflow Device

A. Backflow Device: Shall be in accordance with OSU’s approved standards.

  1. Backflow Cover: “EZ-BOX” as manufactured by Hot Box, 250 N. Lane Avenue, Jacksonville, Florida 32254, 1-(800) 736-0238. For 2 ½” & 3” backflow preventers use HoxBox Model #LB3N. For 4” backflow preventers use HoxBox Model #LB3ES. EZ-BOX shall be installed on a 4” thick concrete pad (size pad to be 2” larger than EZ-BOX on all sides). EZ-BOX shall be mounted to concrete pad.
  2. The backflow preventer and enclosure shall be as per City and university codes, standards and regulations. The size and location is shown on the Drawings. OSU will supply electrical power to the backflow preventer. Contractor to install backflow preventer and connect to heat tape at backflow preventer.

 

2.16 Control Wires

A. Provide 14 AWG/1.6 mm diameter twisted decoder wire in sheathed casing as provided by Hunter Industries. Provide DBR6 or DBY6 wire connectors as manufactured by 3M for connection of decoders to valve connections and decoders to two wire system. Wire runs shall not be looped. All two wire control wiring shall be buried a minimum depth of 24” along Schedule 40 mainlines, or any path that does not run along the mainline route.

B. Conventional electrical control wires shall be type UF, U.L. approved with polyvinyl chloride (PVC) insulation. Wire shall be sized according to requirements with common ground and color coded for each zone. The use of multi-stranded direct burial wire is prohibited.

 

2.17 Valves Boxes

A. Boxes shall be high impact-strength plastic. Boxes shall have a lockable cover. Two keys shall be furnished with each system for each type of box provided. All valve boxes shall have the purple color coded and identified reclaimed water covers. Refer to irrigation detail sheets for enclosure sizes.

  1. Manufacturer: Carson or approved equal.

 

2.18 Two Wire Irrigation Decoder Controller

A. Controller shall be Model no. ACC-99D. Include Hunter ET System. Controller shall be equipped for compatibility with the HUNTER IMMS Central Control System. Controller to be pedestal or wall mounted and located as shown on the irrigation plans. Irrigation contractor to provide power to controller as necessary. OSU will supply electrical power to the controller. Contractor to install controller in location as shown on irrigation plans.

 

2.19 Conventional Irrigation Controllers

A. Replacement controllers shall be Model No. ACC-3600. Refer to irrigation plan for quantities of ACM-600 modules necessary for each proposed conventional controller located on project. Controller shall be equipped for compatibility with the HUNTER IMMS Central Control System. Controller to be wall mounted and located in existing locations as shown on the irrigation plans. OSU will supply electrical power to the controller. Contractor to install controllers in locations as shown on the irrigation plans.

 

2.20 Central Control

A. The central control software shall be Hunter Industries model IMMS3CD with software option IMMS-ET. The ET sensor platform shall be Hunter Industries model ET SENSOR installed at specified Hunter model ACC controller locations, as directed by owner. The wind speed sensor shall be Hunter Industries model ETWIND, which shall be added to the ET Sensors as specified. The field controllers shall be Hunter Industries model ACC with communications modules and sensors installed as described.

 

2.21 Central Control Computer

A. The central computer shall have a minimum 1 Gb RAM for Windows XP and Vista, 2 Gb RAM for Windows 7. Computer operating system shall be Windows XP, Windows Vista, or Windows 7 (32 bit or 64 bit versions).

 

2.22 Wireless Freeze Sensor and Rain Sensor & ET Sensor

 

2.23 Trace Wire and Warning Tape

 

2.24 Grounding Plates

A. Solid copper grounding plates (4” x 96” x 0.064”) shall be provided as necessary at the proposed controllers as shown on plans. Solid copper grounding plates shall be provided along the main two wire path. Locate grounding plates 30” below grade as shown on the irrigation detail sheets. Provide earth contact backfill material part no. 1820058 at all grounding plates. Grounding plate and earth contact backfill material as manufactured by Paige Grounding Systems. Install grounding plates and earth contact backfill material as per manufacturer’s recommendations.

 

2.25 Sod

 

2.26 Water

A. During construction and testing of the irrigation system, the domestic water from the Project property will be obtained on site from the existing irrigation water sources on campus as shown on the irrigation plans. The Contractor shall utilize the water in a conservative manner. Irrigation water meters to be supplied by OSU and installed by contractor as per OSU or city codes and standards.

 

Section 3 - Execution

3.1 General

 

3.2 Installation

 

3.3 Testing

 

3.4 Inspection

A. Examine areas and conditions under which Work of this Section is to be performed. Do not proceed with Work until unsatisfactory conditions have been corrected.

 

3.5 Operation and Maintenance

 

3.6 Sod

 

3.7 Final Testing and Acceptance

 

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