10-328400 - PLANTING IRRIGATION SPEC.pdf

PLANTING IRRIGATION

City of St. George | Downtown Cemetery Columbarium Plaza

328400 - 1 October 2026

SECTION 328400 - PLANTING IRRIGATION

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. City of St. George Standard Specifications for Design and Construction, latest edition.

B. City of St. George Landscape Standards Ordinance, Title 10, Chapter 23.

1.2 SUMMARY

A. The work covered by this section consists of furnishing all labor, materials, equipment and supplies in performing all operations in connection with planting irrigation work in strict accordance with this section and applicable drawings. Work includes trenching, placement of irrigation mainline pipe, distribution pipe, valves, quick couplers, rotors, spray heads, drip emitters, backfilling trenches, and electrical connections for controllers and valve, coverage adjustments, programming, start up and maintenance.

B. Any minor items of labor or materials not specifically noted on the drawings or specifications;

but necessary for the proper completion of the work, shall be considered incidental to and are to be included in the work.

C. The irrigation system shall be able to function adequately enough that newly installed plant material CAN BE IRRIGATED WITHIN 24 HOURS OF INITIAL PLANTING. Contractor shall be responsible for immediate replacement of any plants, seeds, or turf that perishes due to lack in insufficient watering by an inadequately functioning or installed irrigation system at no additional cost to the owner.

D. Work under this section shall include coordination of all work with all other sections of these specifications.

E. Section Includes:

1. Piping

2. Backflow Prevention Device

3. Filter Device

4. Manual valves

5. Pressure-reducing valves

6. Automatic control valves

7. Automatic drain valves

8. Miscellaneous piping specialties

9. Sprinklers

10. Quick couplers

11. Drip irrigation specialties

12. Controllers

13. Boxes for automatic control valves

328400 - 2 October 2026

1.3 DEFINITIONS

A. Lateral Piping: Downstream from control valves to sprinklers, specialties, and drain valves.

Piping is under pressure during flow.

B. Drain Piping: Downstream from circuit-piping drain valves. Piping is not under pressure.

C. Final Acceptance: When the City of St. George accepts the project as fully complete and takes ownership.

D. Manifold Piping: Downstream from water meter to ball valve.

E. Main Line Piping: Downstream from point of connection to water distribution piping to, and including, control valves. Piping is under water-distribution-system pressure.

F. Low Voltage: As defined in NFPA 70 for circuits and equipment operating at less than 50 V or for remote-control, signaling power-limited circuits.

1.4 PERFORMANCE REQUIREMENTS

A. Irrigation zone control shall be automatic operation with controller and automatic control valves.

B. Installed Coverage Rate: 100%

1. After construction the City shall provide a 3rd party water audit by a qualified irrigation auditor to verify that a minimum 70% distribution uniformity level has been achieved for single stream rotors and a minimum 60% distribution uniformity level has been achieved for fixed spray heads.

1.5 SUBMITTALS

A. Submit technical data for all products indicating all sizes, options, etc. to the City’s Project Manager or the Project Manager’s authorized representative and the City’s Park Planning Inspector.

B. Submit technical data as requested for approval of proposed equivalent products where permitted to the City’s Project Manager or the Project Manager’s authorized representative and the City’s Park Planning Inspector.

C. Zoning Chart: Show each irrigation zone and its control valve with a separate color designation on an 11x17 size, laminated (3 ml) exhibit. These charts will be stored inside the controller enclosure.

D. Controller Timing Schedule: Indicate timing settings for each automatic controller zone.

E. Operation and Maintenance Data: As part of the close-out procedures all operation and maintenance manuals shall be provided to the City’s Park Planning inspector. (controller, hand held radio, automatic control valves, gate valve keys, quick coupler key, etc.)

328400 - 3 October 2026

1.6 QUALITY ASSURANCE

A. Installer Qualifications: The Irrigation Contractor shall meet state and local license, insurance and bonding requirements per section 10-23-1(B)(1) of the City of St. George Landscape Ordinance and is able to show proof of such upon demand.

1. Installer’s Field Supervision: Require Installer to maintain an experienced full-time supervisor fluent in English on the project site when work is in progress.

B. Irrigation Auditor: Irrigation Association (IA) certified water auditor; www.irrigation.org

C. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Deliver piping with factory-applied end caps. Maintain end caps through shipping, storage, and handling to prevent pipe-end damage and to prevent entrance of dirt, debris, and moisture.

B. Store plastic piping protected from direct sunlight. Support to prevent sagging and bending.

1.8 PROJECT COORDINATION

A. Coordinate with other trades to ensure sleeving is placed in all locations required and as specified.

B. Interruption of Existing Water Service: Do not interrupt water service to facilities occupied by Owner or others unless permitted under the following conditions and then only after arranging to provide temporary water service according to requirements indicated:

1. Notify City Water Department Inspector no fewer than five days in advance of proposed interruption of water service.

2. Do not proceed with interruption of water service without City Water Department Inspector’s written permission.

C. Pressure (PSI) Verification: verify that design/installation pressures at the point of connection are adequate.

D. Utility Locate: Notify Blue Stakes 800-662-4111 or www.bluestakes.org locating service before work begins.

1.9 WARRANTY

A. Contractor shall provide a one (1) year warranty from the Date of Final Acceptance.

1.10 INSPECTIONS

A. The City of St. George Park Planning Division will make irrigation system inspections as follows where applicable to items specified for this project. Contractor must call for inspection and get approval from the City Park Planning Inspector and/or City Project Manager before proceeding with the next work task or risk removal and replacement of work installed WITHOUT additional compensation.

1. Sleeving location, depth, type and size.

2. Permanent sleeve marking system in place.

328400 - 4 October 2026

3. Irrigation manifold; meter, filter or backflow device, Master Valve and flow sensor

4. Mainline depth, type, marking and size (open trench required)

5. Wire connections, size, depth, type

6. Mainline connections, thrust blocks, and/or mechanical joint restraints

7. Hydrostatic test as specified

8. Box supports, markings, valve ID tags

9. Controller type, stations, location, enclosure

10. Controller installation, power connection, certification

11. Lateral line depth, type and size (open trench required)

12. Head and emitter types, spacing and swing joints

13. Water audit

14. Turnover manuals, controller charts, keys, warrantees, as-builts (Record Drawings)

PART 2 - PRODUCTS

2.1 PIPES, TUBES, AND FITTINGS

A. Required Product: Crestline, Spears or approved equal.

B. Comply with requirements in the piping schedule for applications of pipe, tube, and fitting materials, and for joining methods for specific services, service locations, and pipe sizes.

C. PE Pipe with Controlled ID: ASTM F771, PE 3408 compound; SIDR 11.5 and SIDR 15.

1. Insert Fittings for PE Pipe: ASTM D2609, nylon or propylene plastic with barbed ends.

Include bands or other fasteners.

D. PVC Pipe: ASTM D 1785, PVC 1120 compound, Schedule 40 and 80.

1. PVC Socket Fittings: ASTM D2466, Schedule 40; and ASTM D2467, Schedule 80.

2. PVC Threaded Fittings: ASTM D2464, Schedule 80.

3. PVC Socket Unions: Construction similar to MSS SP-107, except both headpiece and tailpiece shall be PVC with socket ends.

E. PVC Electrical Conduit: UL 651 including 90° C rating, NEMA TC 2, Schedule 40, Gray Color

1. PVC Socket Fittings: UL 651, Schedule 90, Gray Color

2. PVC Threaded Fittings: UL 651, Schedule 80, Gray Color

3. PVC Socket Unions: UL 651, Schedule 80, Gray Color

4. PVC Belled End Fittings: UL 651, Schedule 40, Gray Color

F. Ductile Iron - Deep, Slant Bell: ASTM A536

1. Leemco, Harco or approved equivalent.

a. Commercial for IPS, DPS & DIN plastic pipe.

G. Mechanical Joint Restraints: ASTM A563 and ASTM F1674

1. Leemco, Harco or approved equivalent.

a. Commercial for IPS, DPS & DIN plastic pipe.

328400 - 5 October 2026

2.2 PIPING SCHEDULE

A. Install components having pressure rating equal to or greater than system operating pressure.

B. Piping in control-valve boxes and aboveground shall be joined with unions instead of joints indicated.

C. Purple pipe shall be used for irrigation systems using reclaimed, secondary, or a non-potable water source.

D. Underground irrigation main piping, NPS 2 and smaller, shall be the following:

1. Schedule 40, PVC pipe and socket fittings; and solvent-cemented joints.

E. Underground irrigation main piping, NPS 2-1/2 and greater, shall be the following:

1. Schedule 40, PVC pipe and socket fittings, and solvent-cemented joints.

a. See 2.3 (D) for Mechanical Joint Restraint information.

2. Schedule 80, PVC pipe; Schedule 80, threaded PVC fittings; and threaded joints.

a. See 2.3 (D) for Mechanical Joint Restraint information.

F. Underground circuit piping, NPS 2-1/2 to NPS 4, shall be the following:

1. Schedule 40, PVC pipe and socket fittings; and solvent-cemented joints.

G. Underground circuit piping, NPS 2 and smaller, shall be one of the following:

1. Schedule 40, PVC pipe and socket fittings; and solvent-cemented joints.

2. SDR 7, 9, PE, controlled ID pipe; insert fittings for PE pipe; and fastener joints.

3. SDR 9, 11, 15 PE, controlled OD pipe; PE butt, heat fusion, or PE socket-type fittings; and heat-fusion joints.

H. On-grade circuit piping covered by mulch or underground circuit piping, NPS 1 and smaller, shall be one of the following:

1. For Culinary Water Systems: SDR 7, 9, PE (polyethylene), controlled ID pipe; insert fittings for PE pipe; and fastener joints. Toro T_EHD2667-066A Blue stripe distribution tubing or approved equal.

2. For Secondary or Reclaimed Water Systems: SDR 7, 9, PE (polyethylene), controlled ID pipe; insert fittings for PE pipe; and fastener joints. Toro T_EHP2667-066A Lavender stripe distribution tubing or approved equal.

3. SDR 9, 11, 15 PE, controlled OD pipe; PE butt, heat fusion, or PE socket-type fittings; and heat-fusion joints.

I. Underground Branches and Offsets at Sprinklers and Devices: Schedule 80, PVC pipe; threaded PVC fittings; and threaded joints.

1. Option: Plastic swing-joint assemblies, with offsets for flexible joints, manufactured for this application.

328400 - 6 October 2026

J. Drain piping shall be one of the following:

1. SIDR 9, 11.5, or 15, PE, controlled ID pipe; insert fittings for PE pipe; and banded or fastener joints.

2. Schedule 40, PVC pipe and socket fittings; and solvent-cemented joints.

2.3 PIPING JOINING MATERIALS

A. Pipe-Flange Gasket Materials: AWWA C110, rubber, flat face, 1/8 inch thick unless otherwise indicated; full-face or ring type unless otherwise indicated.

B. Solvent Cements for Joining PVC Piping: ASTM D 2564. Include primer according to

ASTM F 656.

C. Plastic, Pipe-Flange Gasket, Bolts, and Nuts: Type and material recommended by piping system manufacturer unless otherwise indicated.

D. Mechanical Joint Restraint: ASTM A536. For underground irrigation mainline NPS 2-1/2 and greater, joint restraint shall be knuckle type as manufactured by Leemco, Harco (Harrington Corporation) or approved equal.

1. Mechanical Joint Restraints shall be used on underground circuit piping NPS 2-1/2 or greater when specified.

2.4 SLEEVES

A. PVC Pipe: ASTM D 1785, PVC 1120 compound, Schedule 40. Crestline or approved equal.

B. Sleeves shall occur under all sidewalks, driveways, trails, and other paving where irrigation mainlines and/or lateral lines cross. Ends of pipe shall extend a minimum of 12 inches beyond the edge of pavement and be marked with rebar stakes, paint and tracer wire shall run the length of the sleeve. Irrigation mainline and lateral lines shall not run under large patio areas or expanses of concrete paving but shall be routed around these areas, unless otherwise directed in writing by the Landscape Architect or the City’s Project Manager or other authorized representative.

Controller wires shall run in a separate sleeve from the mainline.

C. All sleeves shall have a 4” inch minimum pipe diameter size or larger as noted in the Irrigation Plan and Irrigation Materials Schedule.

2.5 BACKFLOW PREVENTERS

A. Double-Check, Backflow-Prevention Assemblies:

1. Manufacturers: Subject to compliance with requirements, provide products by the following:

a. Wilkins Model 950 XL.

2. Standard: ASSE 1015.

3. Operation: Continuous-pressure applications, unless otherwise indicated.

4. Pressure Loss: [5 psig] <Insert pressure> maximum, through middle 1/3 of flow range.

5. Size: ¾” to 2”

328400 - 7 October 2026

6. Design Flow Rate: 0 - 70 gpm

7. Body: Bronze for NPS 2 and smaller; steel with interior lining complying with

AWWA C550 or that is FDA approved for NPS 2-1/2 and larger.

8. End Connections: Threaded for NPS 2 and smaller; threaded for NPS 2-1/2 and larger.

9. Configuration: Designed for horizontal, straight through flow.

10. Accessories: Ball valves with threaded ends on inlet and outlet of NPS 2 and smaller;

OS&Y gate valves with flanged ends on inlet and outlet of NPS 2-1/2 and larger.

2.6 MANUAL VALVES

A. Required Product: Subject to compliance with requirements, provide:

B. Plastic Ball Valves:

1. SPEARS or approved equivalent.

a. Commercial Ball Valves, Socket or Threaded; Line size.

C. Brass Gate Valves for 1”, 1-1/2”, 1-3/4”, 2”

1. Matco-Norca or approved equivalent.

a. Commercial, Model 514T Full Port Gate Valve; Line size.

D. Ductile Iron Gate Valves for 2-1/4” and larger main piping:

1. Matco-Norca, or approved equivalent.

a. Commercial, 200MD-Series Angle Valves for IPS, DPS and DIN plastic pipe.

E. Lateral Isolation Valves for 2” and larger piping:

1. Leemco, Harco or approved equivalent.

a. Commercial, Model LV-Series Angle Valves for IPS, DPS & DIN Plastic Pipe

b. Epoxy coated Ductile Iron or Stainless Steel bodies:

1) Ductile Iron Bodies: Class 350, Ductile Iron ASTM A-536

2) Stainless Steel Bodies: 316 Stainless Steel, ASTM A-351

c. 250 psi or greater rated angle globe valve.

d. 360° male swivel inlets for IPS, DPS and DIN plastic pipe.

2.7 PRESSURE-REDUCING VALVES

A. Water Regulators:

1. Required Product: Subject to compliance with requirements, Wilkins PRV valve.

2.8 WATER FILTER DEVICE FOR SECONDARY, RECLAIMED, AND NON-POTABLE

WATER SYSTEMS

A. Required Product: Subject to compliance with requirements, AMIAD Filtration Systems.

1. 4” Inch Steel Manual Flush Filter for flow rates up to 300 gpm

a. Model No. 4” Compact In-Line

2. Screen size 300 microns.

328400 - 8 October 2026

2.9 AUTOMATIC CONTROL VALVES

A. Required Product: Subject to compliance with requirements, Rainbird Corporation.

B. Master Valve

1. 300-BPES

a. Provide the purple flow control handles – NP-HAN

C. Automatic Control Valves

1. 200 – PESB-R Plastic industrial valve for flow rates from 75 to 125 gpm.

a. Provide the purple flow control handles – PESB-NP-HAN2

D. Automatic Control Valves for Drip Application

1. Control Zone Kit; Commercial grade

a. XCZ-100-PRB-COM: 1” PESB valve, 1” basket filter with 100 mesh stainless steel screen, 40 psi Pressure Regulator and 1” Ball Valve for flow rates from 3 to 20 gpm.

2.10 FLOW SENSOR

A. Required Product: Subject to compliance with requirements, Subject to compliance with requirements, Rain Bird Company or approved equal.

1. FS Series for irrigation (2”, 3”, 4”) 4” Model No. FS400P

2. Provide Flow Sensor Decoder, Model No. SD-210-TURF

2.11 QUICK COUPLERS

A. Required Product: Subject to compliance with requirements, provide Weathermatic (previously Signature) brand.

1. Weathermatic 1” inch Quick Coupling Valve – One Piece, Model No. 7645-QCVLNP

a. Provide one (1) Coupling Key per QC valve; Model No. 7641-QCVKEY

2. For ALL water applications install lavender (purple) locking vinyl cover.

2.12 MANUAL DRAIN VALVES ON MAINLINES

A. Required Product: Subject to compliance with requirements provide:

1. SPEARS or approved equivalent.

a. Commercial Ball Valves, Socket or Threaded; Line size.

2.13 SPRINKLERS

A. General Requirements: Designed for uniform coverage over entire spray area indicated at available water pressure.

B. Required Product: Subject to compliance with requirements, provide Rainbird Corporation.

C. Plastic, Pop-up, Gear-Drive Rotary Sprinklers:

1. 5000 Series Rotors for radii 17 to 55 feet for turf application.

328400 - 9 October 2026

a. See plan for specified nozzles

2. 8005 Series Rotors for radii 39 to 81 feet for turf application.

a. See plan for specified nozzles

3. For non-potable water applications install purple covers.

4. Flex800 35-6/55-6 Series Golf Rotors

D. Plastic, Pop-up Spray Sprinklers:

1. 1806 SAM Series Spray Bodies:

a. Plastic MPR Nozzles Series 5, 8, 10, 12, 15

1) See plan for specified nozzles

b. R-VAN High-Efficiency Rotary Nozzles Series 14, 18, 24, LCS, RCS, SST

1) See plan for specified nozzles

2) Rotary Nozzles are for Culinary water applications only

2. For non-potable water applications install purple covers.

2.14 DRIP IRRIGATION SPECIALTIES

A. Required Product: Subject to compliance with requirements, provide Rainbird Corporation, Toro or Netafim.

B. Point Source Emitters:

1. Distribution Tubing (Non-Potable): 1” Toro Lavender Stripe® Polyethylene Hose

a. Model No. T-EHP2667-066A

2. Drip Tubing: ¼” Rainbird XQ tubing

3. Drip Emitter: Rainbird Xeri-Bug™ XB-Series with barb inlet. See plan for specific emitters.

4. Tubing Stake: Rainbird TS-025 w/cap

5. Diffuser Bug Cap: Rainbird DBC-025

C. Drip Tubes with In-line Emitters:

1. Dripline: Toro 5/8” Drip In® PC Brown Dripline T-PCB1810-12

A. Manual Flush Valves:

1. SPEARS or approved equivalent.

a. Commercial Ball Valves, Socket or Threaded; Line size.

2.15 CONTROLLERS

A. Required Product (when specified on the plan): Subject to compliance with requirements, The Rain Bird Company.

1. See description below for Two-Wire System and components:

B. Description; Two-Wire:

1. Rain Bird ESP Two-Wire Controller with IQ Radio Controller.

a. Model # ESP-LXD. See Irrigation plans for specific cabinet enclosure and pedestal.

b. Specify cabinet enclosure and pedestal type:

328400 - 10 October 2026

1) LXMSS: Stainless Steel Cabinet

2) LXMMSSPED: Stainless Steel Pedestal

c. Specify Two-Wire Station Decoders:

1) FD-101TURF: 1 Station

2) FD-202TURF: 2 Station.

3) FD-401TURF: 4 Station.

d. Specify Rain Bird Flow Sensor Decoder:

1) SD-210-TURF

e. Specify Rain Bird In-Line Surge Protection (one unit per valve bank):

1) LSP-1-TURF

f. Specify Rain Bird Two-Wire Decoder Programing Unit:

1) DPU-210

2. Control Wire

a. Provide minimum 14 gauge direct burial wire (Maxi-Wire) PE insulated and jacketed type UF wire and water resistant connections.

b. Place wire in approved 1” PVC Gray Schedule 40 electrical conduit from Controller to system components, and all box to box connections.

c. Refer to Rain Bird® Residential/Commercial Irrigation Specification Catalog for maximum one-way distance (in feet) between controller, valves, and decoders.

2.16 BOXES FOR VALVES AND OTHER COMPONENTS

A. Required Product: Subject to compliance with requirements, Carson Industries or approved equal.

1. Description: Box and cover, with open bottom and openings for piping; designed for installing flush with grade.

a. Size: Verify that equipment fits within boxes with sufficient clearance for maintenance purposes.

b. Shape: Round, Square or Rectangle to accommodate below grade irrigation equipment, extra wires, etc.

c. Cover Material: HDPE

1) Provide bolt down cover option.

d. Cover Color:

1) Green in turf

2) Tan in landscape area

e. UV inhibitors for long life and appearance

B. Valve Box Granular Fill: Cleaned (washed) angular gravel or crushed stone, graded from 1/2 inch minimum to 1 inch maximum NO FINES.

C. Backflow & Filter Enclosure: Subject to compliance with requirements, Hot Box®.

1. Description: HotRok cover for all above ground backflow & filter devices.

a. Size: Verify that equipment fits within boxes with sufficient clearance for maintenance purposes.

328400 - 11 October 2026

b. Cover Material: Thixotropic polyester resin reinforced with fiberglass strand.

1) Provide locking option.

2) Provide 4” concrete pad around backflow device for cover anchoring.

3) Cover Color: Provide color to blend with landscape mulch color.

4) Insulated.

PART 3 - EXECUTION

3.1 EARTHWORK

A. DEFINITIONS

1. Backfill: Soil material used to fill an excavation.

2. Initial Backfill: Backfill placed beside and over pipe in a trench, including haunches to support sides of pipe.

3. Final Backfill: Backfill placed over initial backfill to fill a trench.

4. Bedding Course: Aggregate layer placed over the excavated sub-grade in a trench before laying pipe.

5. Utilities: On-site underground pipes, conduits, ducts, and cables, as well as underground services within buildings.

B. SUBMITTALS

1. Product Data: For each type of the following manufactured products required:

a. Warning tapes.

2. Samples for Verification: For the following products, in sizes indicated below:

a. Warning Tape: 12 inches long; of each color.

C. SOIL MATERIALS

1. General: Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations.

2. Bedding Course: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; except with 100 percent passing a 1-inchsieve and not more than 8 percent passing a No. 200 sieve.

D. ACCESSORIES

1. ALL irrigation mainlines shall have the following detection devices:

a. Detectable Warning Tape:

1) Acid- and alkali-resistant, polyethylene film warning tape manufactured for marking and identifying underground utilities;

2) A minimum of 2 inches wide, continuously inscribed with a description of the utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 30 inches deep;

3) Shall be buried between 6 to 12 inches directly ABOVE irrigation mainline;

4) Colored as follows:

328400 - 12 October 2026

a) Blue: Culinary water source irrigation mainlines.

b) Purple/Lavender: Non-potable water (reclaimed or secondary) source irrigation mainlines.

b. Tracer Wire / Locator Wire:

1) Trace wire shall be 14 AWG, direct burial rated single solid copper, copper clad steel, or stainless steel wire conductor, insulated with HMWPE insulation in accordance with UL83 and ASTM requirements.

2) Wire shall be taped to the mainline in intervals of no less than 8’ feet to 10’ feet on the center of the pipe.

3) End of wire shall be attached to grounding rod (copper, zinc, or magnesium) that is driven into the ground in accordance with UL83 or ASTM standards.

4) Wire color:

a) Blue: Culinary water source irrigation mainlines

b) Purple/Lavender: Non-potable water (reclaimed or secondary) source irrigation mainlines.

5) Trace wire shall start in the Master Valve box and shall be labeled with an attached Christie tag.

E. PREPARATION

1. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earth moving operations.

2. Protect and maintain erosion and sedimentation controls during earth moving operations.

F. DEWATERING

1. Prevent surface water and ground water from entering excavations, from ponding on prepared sub-grades, and from flooding Project site and surrounding area.

2. Protect sub-grades from softening, undermining, washout, and damage by rain or water accumulation.

a. Reroute surface water runoff away from excavated areas. Do not allow water to accumulate in excavations. Do not use excavated trenches as temporary drainage ditches.

G. EXCAVATION FOR TRENCHES

1. Excavate trenches to indicated gradients, lines, depths, and elevations.

2. Beyond building perimeter, excavate trenches to allow installation of top of pipe below frost line.

3. Excavate trenches to uniform widths to provide the following clearance on each side of pipe or conduit. Excavate trench walls vertically from trench bottom to provide minimum cover over top of underground piping according to the following:

a. Irrigation Main Piping: Minimum depth of 24” inches below finished grade.

b. Lateral Piping: 18 inches.

c. Distribution Tubing: 2 inches (including mulch)

d. Drain Piping: at low point in system

e. Sleeves: 24 inches or depth of piping as described above. Sleeves for distribution tubing to be below base material of paved surface.

4. Clearance: 8 inches each side of pipe, sleeve or conduit.

328400 - 13 October 2026

5. Trench Bottoms: Excavate and shape trench bottoms to provide uniform bearing and support of pipes and conduit. Shape sub-grade to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits. Remove projecting stones and sharp objects along trench sub-grade.

a. For pipes and conduit less than 6 inches in nominal diameter, hand-excavate trench bottoms and support pipe and conduit on an undisturbed sub-grade.

b. For pipes and conduit 6 inches or larger in nominal diameter, shape bottom of trench to support bottom 90 degrees of pipe or conduit circumference. Fill depressions with tamped sand backfill.

6. Trenches within Tree Driplines- and Plant-Protection Zones:

a. Hand-excavate to indicated lines, cross sections, elevations, and sub-grades. Use narrow-tine spading forks to comb soil and expose roots. Do not break, tear, or chop exposed roots. Do not use mechanical equipment that rips, tears, or pulls roots.

b. Do not cut main lateral roots or taproots; cut only smaller roots that interfere with installation of utilities.

H. SUBGRADE INSPECTION

1. Notify Park Planning Inspector and/or Project Manager when excavations have reached required sub-grade.

2. If Park Planning Inspector and/or Project Manager determines that unsatisfactory soil is present, continue excavation and replace with compacted backfill or fill material as directed.

I. TRENCH BACKFILL

1. Place and compact backfill in excavations promptly, but not before completing the following:

a. Surveying locations or accurately measuring location from adjacent hard surfaces of underground utilities for Record Drawings.

b. Testing and inspecting underground utilities.

c. Removing trash and debris.

2. Place backfill on sub-grades free of mud, frost, snow, or ice.

3. Place and compact bedding course on trench bottoms and where indicated. Shape bedding course to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits.

4. Place and compact initial backfill of satisfactory soil, free of particles larger than 1 inch in any dimension, to a height of 12 inches over the pipe or conduit.

a. Carefully compact initial backfill under pipe haunches and compact evenly up on both sides and along the full length of piping or conduit to avoid damage or displacement of piping or conduit. Coordinate backfilling with utilities testing.

5. Install detectable warning tape directly above utilities, 12 inches below finished grade, except 6 inches below sub-grade under pavements and slabs

J. SOIL FILL

1. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 horizontal so fill material will bond with existing material.

2. Place and compact fill material in layers to required elevations as follows:

a. Under grass and planted areas, use satisfactory soil material.

3. Place soil fill on sub-grades free of mud, frost, snow, or ice.

328400 - 14 October 2026

K. SOIL MOISTURE CONTROL

1. Uniformly moisten or aerate sub-grade and each subsequent fill or backfill soil layer before compaction to within 2 percent of optimum moisture content and per geotechnical report specifications.

a. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice.

L. COMPACTION OF SOIL BACKFILLS AND FILLS

1. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 1557:

a. For mainline trenches under hardscape, compact each layer of initial and final backfill soil material to the specified percentage for finish surface.

b. For mainline trenches in planting areas, compact each layer of initial and final backfill soil material to 85 percent.

3.2 PIPING INSTALLATION

A. Location and Arrangement: Drawings indicate the diagrammatic location and arrangement of piping systems. Install mainline piping, valves, lateral line piping and other equipment in planters and turf areas wherever possible. Irrigation mainlines and lateral lines must be sleeved under pavement.

B. Install piping at minimum uniform slope of 0.5 percent down toward drain valves.

C. Install piping free of sags and bends.

D. Install groups of pipes parallel to each other, spaced to permit valve servicing.

E. Install fittings for changes in direction and branch connections.

F. Install unions adjacent to valves and to final connections to other components with NPS 2 or smaller pipe connection.

G. Install flanges adjacent to valves and to final connections to other components with NPS 2-1/2 or larger pipe connection.

H. Install 36” length expansion loops in control-valve boxes for plastic piping.

I. Lay piping on solid sub-base, uniformly sloped without humps or depressions.

J. Install PVC piping in dry weather when temperature is above 40 deg F. Allow joints to cure at least 24 hours at temperatures above 40 deg F before testing.

K. Install water regulators with shutoff valve and strainer on inlet and pressure gage on outlet. Install shutoff valve on outlet. Install aboveground or in control-valve boxes.

L. Install piping in sleeves under parking lots, roadways, and sidewalks, and trails in straight lines and without bends. Design lengths are a maximum of 30’.

328400 - 15 October 2026

M. Install sleeves made of Schedule 40 PVC pipe and socket fittings, and solvent-cemented joints.

All sleeves shall have a 4” inch minimum pipe diameter unless otherwise noted in the Irrigation Plan Schedule.

3.3 JOINT CONSTRUCTION

A. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe.

B. Remove scale, slag, dirt, and debris from inside and outside of pipe and fittings before assembly.

C. Threaded Joints: Thread pipe with tapered pipe threads according to ASME B1.20.1. Cut threads full and clean using sharp dies. Ream threaded pipe ends to remove burrs and restore full ID.

Join pipe fittings and valves as follows:

1. Apply appropriate tape or thread compound to external pipe threads unless dry seal threading is specified.

2. Damaged Threads: Do not use pipe or pipe fittings with threads that are corroded or damaged. Do not use pipe sections that have cracked or open welds.

D. Flanged Joints: Select rubber gasket material, size, type, and thickness for service application.

Install gasket concentrically positioned. Use suitable lubricants on bolt threads.

E. PE Piping Fastener Joints: Join with insert fittings and bands or fasteners according to piping manufacturer's written instructions.

F. PVC Piping Solvent-Cemented Joints: Clean and dry joining surfaces. Join pipe and fittings according to the following:

1. Comply with ASTM F 402 for safe-handling practice of cleaners, primers, and solvent cements.

2. PVC Pressure Piping: Join schedule number, ASTM D 1785, PVC pipe and PVC socket fittings according to ASTM D 2672. Join other-than-schedule-number PVC pipe and socket fittings according to ASTM D 2855.

3. PVC Non pressure Piping: Join according to ASTM D 2855.

3.4 VALVE INSTALLATION

A. In-ground Automatic Control Valves, Manual Valves, Water Filter Device, Flow Sensor, Quick Coupler, Manual Drain Valve: Install as components of connected piping system with all associated protective covers. Install valve box lids at a consistent height throughout the project and per the construction plan details. Group automatic control valves per the construction plan details.

3.5 SPRINKLER INSTALLATION

A. Install sprinklers after hydrostatic test is completed.

B. Install pop-up sprinklers at manufacturer's recommended heights perpendicular to grade with tops flush with finished grade.

328400 - 16 October 2026

C. Locate pop-up part circle sprinklers to maintain a minimum distance of 4 inches from walls and 2 inches from edge of concrete and 6 inches from edge of asphalt surface.

3.6 DRIP IRRIGATION SPECIALTY INSTALLATION

A. Install drip tubes with direct-attached emitters on stakes per construction details.

1. 1/4" Drip tube lengths shall not exceed four (4) feet from lateral piping connection to plant.

B. Install drip tubes with built-in emitters directly on ground.

C. Install application pressure regulators and filter units in piping near device being protected, and in control-valve boxes.

3.7 IRRIGATION-CONTROLLER INSTALLATION

A. Pedestal Mounting: Install exterior freestanding controller in specified enclosure on precast concrete bases.

1. Stake or mark controller location for approval.

2. Mount the panel enclosure so the operator can conveniently make adjustments.

3. Properly ground controller in accordance with Utah Laws and Regulations. Make all control wire connections to automatic controllers. Coordinate controller installation with electrical work.

4. Pour the concrete pedestal base with inserted conduits and anchor bolts. Use setting drawings, templates, diagrams, instructions, and directions furnished with items to be embedded. Install anchor bolts to elevations required for proper attachment to supported equipment.

B. Install controller wire in same trench as irrigation piping and below piping. Provide conductors of size not smaller than recommended by controller manufacturer. Install controller wire in separate sleeve under paved areas.

3.8 CONNECTIONS

A. Comply with the City of St. George Standard Specifications for Construction, latest edition for installation of water meter setters, connection of water supply from exterior water service piping, water meters, protective enclosures, and backflow preventers. Refer to construction drawings for the general arrangement of piping, fittings, and specialties.

B. Install piping adjacent to equipment, valves, and devices to allow service and maintenance.

C. Connect wiring between controllers and automatic control valves.

1. For Two-Wired irrigation systems:

a. Connect two-wire controller wire to irrigation master valve decoders, flow sensor decoder, and remote control valve decoders as per manufacturer’s instructions.

b. If stubbing wires for future expansion of the two-wire irrigation system, do not connect the stubbed wire to the live controller wire.

1) If applicable, leave a 24” inch looped length of stubbed wire in front pull box or valve box and a 48” looped length of stubbed wire placed in expansion pull or valve box.

328400 - 17 October 2026

3.9 IDENTIFICATION

A. Identify system components using identification tags manufactured by T. Christie with component name and installed per construction plan details.

B. Warning Tapes/Trace wire: Arrange for installation of continuous, underground, detectable warning tapes and 14 U.F. direct bury solid core trace wire over underground mainline piping during backfilling of trenches.

3.10 FIELD QUALITY CONTROL

A. Perform tests and inspections.

B. Required Tests and Inspections:

1. Backflow Preventer Certification: Provide certification.

2. Mainline: Depth, type, size, marking tape, connections, and mechanical joint restraints prior to backfill.

3. Lateral Line: Depth, type, size, and fittings prior to backfill.

4. Leak Test: After installation, charge system and test for leaks. Repair leaks and retest until no leaks exist.

5. Hydrostatic pressure test on mainline. After installation charge system to 150 psi for three hours and test hydrostatic pressure in the presence of the City’s representative.

6. Hydrostatic pressure test on lateral lines. After installation charge system to 100 psi for three hours and test hydrostatic pressure in the presence of the City’s representative.

7. Operational Test: After electrical circuitry has been energized, operate controllers and automatic control valves to confirm proper system operation. Conduct in the presence of the City’s representative.

8. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

9. Irrigation Audit. Performed by a 3rd party to verify specified efficiency ratings are achieved, retest failed zones after required adjustments to confirm specified efficiency ratings are achieved.

C. Any irrigation installation will be considered defective if it does not pass tests and inspections.

D. Prepare test and inspection reports for hydrostatic pressure tests and irrigation audit.

3.11 STARTUP SERVICE

A. Perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

2. Verify that controllers are installed, connected and performance is acceptable to the City

Park Planning Inspector and/or Project Manager.

3. Verify that electrical wiring installation complies with manufacturer's recommendation.

3.12 ADJUSTING

A. Adjust settings of controllers.

328400 - 18 October 2026

B. Adjust automatic control valves to provide flow rate at rated operating pressure required for each sprinkler circuit.

C. Adjust sprinklers and devices, except those intended to be mounted aboveground, so they will be flush with finish grade.

D. Adjust sprinklers for uniform head to head coverage and eliminate or minimize overspray onto adjacent paved surfaces. Add additional heads as required to achieve coverage at no additional charge to owner.

E. Make adjustments as required by irrigation audit to meet the specified efficiency requirements.

3.13 CLEAN- UP AND PROTECTION

A. Flush dirt and debris from piping before installing sprinklers and other devices.

B. During irrigation installation, keep adjacent paving, construction, and work area clean and in an orderly condition.

C. Protect any existing or newly planted materials from damage due to irrigation installation operations and operations of other contractor and trades. Maintain protection during installation and maintenance periods. Treat, repair, or replace damaged plantings.

D. Clean adjacent hard surfaces of dirt, debris, and mud resulting from installation and testing of irrigation system.

3.14 DEMONSTRATION

A. Train City of St. George Park’s maintenance personnel to adjust, operate, and maintain automatic control valves and controllers.

END OF SECTION 328400