Operations Division



SECTION 32 84 00PLANTING IRRIGATION - GENERALSUMMARYThis Section includes specifications for completely automatic, electrically controlled spray and drip irrigation systems as described in Article 3.08, Exhibits herein.Furnish and install equipment, materials and assemblies required for a complete and automatically controlled irrigation system.This Section includes maintenance and operation of the irrigation system during the planting Warranty Period of 1-year duration to ensure the health and resumption of growth of planted materials. Refer to Section 32 90 00, Planting.Irrigation piping layout is schematic. Avoid conflicts with plant materials, lighting fixtures, sign posts, site furnishings, architectural features, above and below ground utilities, and drainage systems. Locate piping in planting areas unless shown in sleeves between planting areas.The system is designed to provide complete coverage with minimum maintenance and without overspray onto walks, pavements, and structures.SUBMITTALSProcedures: Section 01 33 00, Submittal Procedures.Product Data: Include manufacturer’s product literature for all products to be installed in this system. Include material showing manufacturer’s name, catalog numbers, catalog cuts, technical data, installation, operation, and maintenance instructions for each product.Point of Connection Water Pressure Test: Test water pressure at each irrigation point of connection. Submit written results of test to the Resident Engineer.Record Drawings:Record accurately in red ink on 1 set of black-line prints all changes in the Work constituting departures from the Contract Drawings.Record the changes and dimensions in a legible manner to the satisfaction of The Resident Engineer. Before Final Inspection of the Work, submit Record Drawings to the Resident Engineer for review.Dimension from 2 permanent points of reference (buildings, monuments, sidewalks, curbs, and pavements). Record data on Record Drawings daily as the Work is being installed.Show locations, depths, size, and information as applicable, of the following items:Point of connection and available static water pressure.Routing of sprinkler mainlines and lateral pipes.Sprinklers.Dripline, air/vacuum relief valves, and flush valves.Gate valves.Irrigation control valves.Quick coupling valves.Routing of control wires.Other irrigation system component locations necessary to accurately represent authorized changes to the irrigation system.Maintain Record Drawings on site.Submit Operation and Maintenance Manuals in accordance with Article 1.05B and Section 01 78 23, Operation and Maintenance Data.Submit controller charts in accordance with Article 1.05A.Submit special tools and spare parts in accordance with Article 1.05C.SEQUENCING AND SCHEDULINGSchedule a Preconstruction Meeting in conjunction with the Preconstruction Meeting described in Section 32 90 00, Planting.Coordinate installation of irrigation as shown on the Contract Drawings with all other Work.Coordinate layout and installation of irrigation sleeves, conduits, and piping under paved areas and other features prior to their construction.Coordinate installation of irrigation system with excavation of planting beds and backfilling of planting beds with topsoil. Refer to Section 32 90 00, Planting for requirements.Install and test the irrigation system before installation of plant material except as noted herein. Coordinate layout and installation of irrigation system with location and installation of plant material to ensure that there will be complete and full irrigation coverage of planting.Stake tree locations in the field prior to installation of irrigation pipe and sprinklers. Refer to the Planting Plans and Details on the Contract Drawings for plant setbacks and spacing requirements.Trees shall be located and planted prior to the installation of the irrigation system.TURNOVER ITEMSController Charts:Record Drawings require approval by Sound Transit before charts are prepared.Provide 1 irrigation zone location chart, sized to fit inside of controller door, for each automatic controller. Show the area covered by the irrigation controller.The chart is a reduced copy of the Record Drawing. In the event that the controller sequence is not legible when the print is reduced, enlarge to a readable size.Mark the chart with a different color to show the area of coverage for each zone.When completed and accepted, hermetically seal chart between 2 pieces of transparent plastic. Install chart in controller enclosure using Velcro plete irrigation zone location charts prior to Final Inspection.Operation and Maintenance Manuals: Within 10 days prior to Final Inspection, prepare and deliver to the Resident Engineer the required descriptive materials, properly prepared in 2 individually bound copies of the operation and maintenance manual.Describe the material installed in sufficient detail to permit operating personnel to understand, operate, and maintain equipment. Include spare parts lists and related manufacturer's information for each equipment item installed. Include following information in manual:Index sheet listing Contractor's address and telephone number, including Names and addresses of local manufacturer's plete operating and maintenance instructions on major equipment.Manuals: As specified in Section 01 78 23, Operations and Maintenance Data.Special Tools and Spare Parts:Supply the following items as part of Contract:4 percent additional sprinklers and nozzles of each type and spray pattern shown on the Contract Drawings.2 wrenches for disassembly and adjustment of each type of sprinkler head installed.2 keys for each automatic controller.1 coupler with 3/4 inch bronze hose bib, bent nose type with hand wheel, and 1 coupler key for each 5 quick couplers installed.1 valve box cover key for each 10 valve boxes.Backflow device valve handles.Deliver tools and spare parts to the Resident Engineer at conclusion of Final Inspection.Provide the following additional documentation at close of Contract:Record Drawings.WARRANTYGeneral Warranty: The Special Warranty specified in this Section shall not deprive the Sound Transit of other rights that Sound Transit may have under other provisions of the Contract Documents, and shall be in addition to, and run concurrent with, other warranties made by the Contractor under requirements of the Contract Documents.Make repairs and replacements and guarantee the satisfactory operation of the entire system in every detail for the 1-year Warranty Period. All warranty repairs and replacements are part of the Contract.Fees:Fees for normal inspections or observations by the Resident Engineer will be paid for by the Sound Transit.Additional inspections, travel expenses, administrative costs and tests required because of defective work or ill-timed notices will be made at the Contractor’s expense.Additional Requirements:Repair settling of trenches. Restoration of plantings, mulch, grades, Pavements or other improvements shall be in accordance with the Contract Documents.Correct irrigation system problems or damage within 24 hours of notice until the Final Inspection of the Work.During the first irrigation season, be available within 1 day for required repairs to the system.Provide a written statement to the Resident Engineer stating that the Contractor shall:Warrant the satisfactory operation of the entire irrigation system including performance, parts, assemblies and workmanship.Return to the job site at the beginning of the first winter season to perform a general inspection of the system, test valves and sprinklers, repair leaks and faulty work, check operation of the system, adjust spray patterns for full coverage, drain system, show grounds staff location of drain valves and blow out points, restore areas where trenches have settled, and adjust irrigation controller scheduling if necessary.Return in spring after the first winter season for a system check and if necessary restore system for spring and summer operation. Explain system and operation methods to grounds staff and have the grounds supervisor furnish a signed statement of compliance with this requirement. Adjust automatic controller scheduling if necessary. - PRODUCTSMATERIALSAll materials and equipment shall be new and the best grade of its kind. All items of equipment or material shall be as indicated or specified by patent or proprietary name or names of manufacturer, or accepted equal.Proposed substitutions for products listed shall be submitted in accordance with Division 1.PIPINGPipe for buried irrigation systems shall be PVC except where noted otherwise.PVC Pipe:Schedule 40 for mainline and lateral pipes: ASTM D 1785, PVC 1120 compound.Schedule 80 for portions of irrigation system as noted on the Contract Drawings: ASTM D 1785, PVC 1120 compound.Schedule 80 female adapters for transition between PE and PVC Pipe.PVC Threaded Nipples: 6 inches long, 1/2 inch diameter, Schedule 80, complying with ASTM D1785.Sleeves: PVC pipe, Schedule 80. Sized as shown on the Contract Drawings.PE Pipe: Class 160. Continuous run within sleeves.PIPE FITTINGSPVC Pipe Fittings: Schedule 80, socket type - ASTM D2467. Schedule 80 threaded type -ASTM D2464.PE Pipe fittings: Fused polyethylene or brass internal barb fittings. For pipe diameter greater than 5/8 inch, use 2 stainless hose clamps and brass barb fittings at each joint, unless noted otherwise in the Contract Drawings.PVC PIPE JOINT COMPOUND AND PRIMERJoint compound: Slow drying, heavy-duty PVC solvent cement type, ASTM 2564.Primer: Tinted, compatible with joint compound; as recommended by manufacturer of PVC pipe, ASTM 656.IRRIGATION SPRINKLERSPop-up Bodies: Use sprinkler pop-up bodies constructed of ultraviolet-resistant plastic construction, an integral check valve that holds up to 8 feet of head (3.50 psi), heavy duty retract spring, and pressure regulation capability in either the pop-up stem or under the nozzle. Use pop-up bodies with 12-inch risers, unless otherwise noted on Contract Drawings. Use Rain Bird 1800-SAM series, Hunter PRS series, Toro 570Z-XF series, or accepted equal.Use sprinkler nozzles constructed of high strength, ultraviolet-resistant and impact resistant plastic with anti-clogging valve adjustment screw for flow and radius adjustment. Use nozzles that have matched precipitation rates for individual irrigation zones. Provide adjustable arc nozzle where noted on Contract Drawings. Use rotary stream sprinkler and bubbler nozzles from Rain Bird, Hunter, Toro, or accepted equal.Provide sprinklers as shown on the Contract Drawings. Use riser nipples for all sprinklers the same size as the threaded opening in the sprinkler body. Sprinklers of the same type shall be by the same manufacturer.Swing Joints: as shown on the Contract Drawings.DRIP IRRIGATIONFurnish all product materials required for full and efficient drip irrigation operation. All products shall be of 1 manufacturer for parts compatibility and ease of installation. Product components shall be the most current models and equipment available, and shall supersede obsolete models and equipment that may be specified in these specifications.Dripline shall consist of nominal sized 1/2-inch low-density linear polyethylene tubing with internal pressure compensating, continuously self-cleaning, integral drippers spaced at 18 inches on center. Dripline shall have integral check valves. The tubing shall be brown in color and conform to an outside diameter (O.D.) of 0.67 inch and an inside diameter (I.D.) of 0.57 inch. Individual pressure compensating drippers shall be welded to the inside wall of the tubing as an integral part of the tubing assembly. These drippers shall be constructed of plastic with a hard-plastic diaphragm retainer and a self-flushing/cleaning elastomer diaphragm extending the full length of the dripper. Space dripline as indicated on Contract Drawings.Header pipe downstream of the irrigation control valves shall consist of nominal sized ? inch low-density linear polyethylene blank tubing. The tubing shall be brown in color and conform to an outside diameter (O.D.) of 0.67 inch and an inside diameter (I.D.) of 0.57 inch.Drip Irrigation Components:Dripline Fittings: All fittings shall be constructed in one of the following end configurations: barbed insert fittings only; male pipe threads (MPT) with barbed insert fittings; or female pipe threads (FPT) with barbed insert fittings. All fittings shall be constructed of molded brown plastic having a nominal inside dimension (I.D.) of 0.57 inch. Female and male threaded ends shall be capable of mating to standard PVC pipe with tapered threads.Soil Staples: Hold dripline in place with 6-inch-long steel soil staples.Automatic Flushing Valves: constructed of brown molded plastic with one of the following end configurations: 1/2-inch MPT or insert inlet with collar.Air/Vacuum Relief Valves: constructed of black and/or gray plastic with a 1/2 inch male pipe thread capable of mating with a threaded PVC reduction bushing or 1/2-inch FPT fitting.IRRIGATION CONTROL VALVESIrrigation control valves must be compatible with the controller, provided with a straight or angle pattern of either brass or bronze, and manufactured for the purpose. Control valves must meet the following requirements:Normally closed, 24-V ac, 60 Hertz solenoid actuated globe pattern diaphragm type with valve pressure rating not less than 200 psi.Valve body and bonnet: Glass-filled nylon, with nylon reinforced rubber diaphragm. Encapsulate solenoid coil in molded epoxy.Actuated by a low power, 2.0 watt, 24-V ac solenoid actuator.Flow control stem and cross handle for regulating and shutting off water flow and bleed screw for manual operation without electrically energizing solenoid coil.Provide for internal parts to be removable from top of valve without disturbing valve installation.DRIP CONTROL VALVE ASSEMBLYDrip valve assemblies must be compatible with the controller, provided with a straight or angle pattern of either brass or bronze, and manufactured for the purpose:Control Valves: Normally closed, 24 VAC, 60 Hertz solenoid actuated globe pattern diaphragm type with valve pressure rating not less than 200 psi. Actuated by a low power, 2.0 watt, 24 VAC solenoid actuator. Size valves as indicated on the Drawings.Control Valve Body and Bonnet: Glass-filled nylon, with nylon reinforced rubber diaphragm. Encapsulate solenoid coil in molded epoxy. Provide for internal parts to be removable from top of valve without disturbing valve installation.Provide control valve with flow control stem and cross handle for regulating and shutting off water flow and bleed screw for manual operation without electrically energizing solenoid coil.Pressure Regulator: The pressure regulator is a spring-operated piston-type regulator with an externally accessible regulation unit. The body is molded black plastic with a combination of male/female pipe threaded inlet and outlet. The pressure regulator will have a built-in indicator that shows when it is operating.Disc Filter: A multiple disc filter equipped with size 120 mesh and constructed of chemical-resistant thermoplastic for corrosion resistance. The body shall be molded of black plastic with male pipe threads for both inlet and outlet. The disc filter shall be capable of periodic servicing by unscrewing a threaded cap or unlatching the band.MASTER VALVESHeavy duty, brass or bronze construction, capable of operation from controller, installed underground with unions, equipped with standard cross handle operating wheel. Normally closed, solenoid actuated globe pattern diaphragm type with valve pressure rating not less than 200 psi.UNIONSPVC schedule 80 threaded for below-grade locations, and provided on both sides of the master control valves, irrigation control valves, strainers, backflow prevention assembly,and pressure reducing valves.IRRIGATION VALVE BOXES AND VALVE KEYSFor irrigation control valves, drip control valve assemblies and gate valves: black plastic valve box with snap lock black cover. Minimum size shall be 16 inches by 12 inches by 10-3/4 inches. Size valve boxes to ensure 3” clearance around and between all connections and valves. Multiple valves may be installed in 1 box, provided that clearances are met.For flow sensor: black plastic valve box with snap lock black cover. Minimum size shall be 16 inches by 12 inches by 10-3/4 inches.For automatic flush valves and air relief valves: Provide a 2-inch diameter, Class 160 PVC protective sleeve with locking cap.For backflow preventer assembly: concrete vault with hinged, locking, metal lid. Basis of design: Utility Vault Company Model 25-TA, or accepted equal.Quick coupler valves: as shown on Contract Drawings. Color: black.Provide 1 set of keys required for valves, valve box covers and protective sleeve caps.IRRIGATION CONTROLLERHunter Manufacture:Hunter Pro-C for building irrigation.Provide controller for complete automatic operation of irrigation system: commercial grade, in weatherproof, lockable box or cabinet, UL listed and with adequate number of stations to operate system. Provide stations with independent time controls with 1-minute incremental settings up to 60 minutes maximum per station. Provide controllers to allow easily made changes on station timing and programs start time without tools or disassembling. Stations may be omitted with time setting of zero minutes. Provide rapid advance between stations and override on each station for manual operation. Provide for schedules up to 1 week and permit multicycle operation as often as every hour. Equip controller with manual start switch for activation of semi-automatic watering cycle.Capable of operating 24-V ac irrigation control valves.Provide a UL listed 24-V ac transformer with controller. Color-code station wiring with irrigation zone indicator key visibly imprinted. Include pump start or master valve control with controller and circuit overload protection to prevent damage due to voltage surges.Controller Housing: Heavy-gauge steel coated with rust inhibitor; finish with industrial gray enamel. Weatherproof cabinet, NEMA Type 4. Gasket controller door and provide covered, heavy-duty lock for protection against theft and vandalism. Mount controller components on face panel for easy removal. Print operating instructions on face of controller for easy access when programming.Lock Cylinder and Master Keying: As specified in Contract Specifications Section 08 71 00, Door Hardware.RAIN SENSORCapable of transmitting signal to irrigation system controller to arrest or delay water schedule due to rain events. Manufacturers: Rain Bird, Hunter, Toro, or accepted equal.IRRIGATION CONTROL WIREProvide thermoplastic insulated, solid copper conductor conforming to ASTM B3, suitable for continuous operation at 24-V ac.Direct burial control wires to irrigation control valves: NEC Type UF or G.E. Co. No. SI-58-51 or accepted equal. Size wire to each irrigation control valve to not exceed 5 percent voltage drop from impressed voltage, not less than No. 14 mon wire: white insulation. Control wire: 1 color other than white or green. Use a different color control wire for each irrigation control valve.Waterproof wire splice connections: 3M DBY, Rain Bird's Penn-Tite, Scotchlok, or accepted equal.WIRE SLEEVE (CONDUIT)A. Conduit below paving: Schedule 40 PVC sized in accordance with irrigation details, or as required to accommodate the number of control wires at each sleeve.BACKFLOW PREVENTERRPZ Valve:Watts brandBall valves and unions on ends of RPZ.Relief drain piped to floor drain.Install test cocks on PRZ.GATE VALVESAWWA C500, bronze body, bronze mounted, non-rising stem with solid wedge gates.Pressure rating: 300 psi.Manufacturer: Wilkins, Nibco, Watts, or accepted equal.PRESSURE REDUCING VALVEBrass body, pressure rating 300 psi. Pressure range 25 to 75 psi adjustable. Basis of design: Wilkins 600, or accepted equal.Factory pressure set at 50 psi.QUICK COUPLING VALVESQuick coupling valves shall be two-piece body type of heavy duty brass or of heavy duty bronze, and watertight both before and after the coupler is inserted. The valve mechanism shall be designed to ensure that the valve seat is closed before the coupler is removed. Each valve shall have the manufacturer’s identification cast or stamped on the valve.Manufacturer: Rain Bird, Hunter, Toro, or accepted equal.FLOW SENSORCapable of transmitting signal to irrigation controller to indicate abnormal flow or leak.Manufacturer: Rain Bird, Hunter, Data Industrial, or accepted equal.WATER METER - CONTRACTOR PROVIDES DEDUCT METER FOR IRRIGATION.Refer to Mechanical Drawings. - EXECUTIONGENERALVerify static pressure at point of connection before installing irrigation system. Report any discrepancy to Resident Engineer.Unless otherwise indicated, irrigation system shown on plans is schematic. With acceptance of the Resident Engineer, make adjustments where necessary to conform to actual field conditions. Irrigation system must be operational, with uniform and adequate coverage of areas to be irrigated prior to planting.Service connections: As indicated or designated by utility company. Notify the Resident Engineer at least 3 weeks before electrical and water services are required. Furnish labor and materials to connect to service connection.Water Supply: Connect to water supply at locations indicated. Make minor changes caused by actual site conditions.Code Requirements: Before Work of this Section, carefully inspect installed Work of other trades and verify that the Work is complete to the point where irrigation system installation may commence properly. Verify irrigation system can be installed in accordance with pertinent codes and regulations, original design, referenced standards and manufacturer's recommendations.Immediately notify the Resident Engineer of conflicts between equipment or methods indicated or specified with local codes, prior to start of installation. If Contractor fails to give notification, assume responsibility for cost of revisions necessary to comply with code.Grades: Before starting Work, carefully review grades to determine if irrigation Work may proceed. Keep within specified material depths with respect to finish grade.Conduct all irrigation Work within tree protection areas in accordance with 01 56 39,Temporary Tree and Plant Protection.Coordination with Work of other trades. Make necessary measurements in field to ensure precise fit of items in accordance with original design. Coordinate installation of irrigation materials with other Work. Coordinate piping locations with tree and shrub locations to avoid conflicts.INSTALLATIONExcavating and Backfilling:Perform excavation and backfilling as specified in Section 31 20 00, Earth Moving. Restore existing surfaces to original condition.Provide not less than 12-inch depth of soil cover over lateral pipes, not less than 18-inch depth of soil cover over mainlines.Provide 2-inch depth of soil cover over driplines.Trenching of new mainline and lateral runs shall be straight and without abrupt grade changes.Trenches shall be free from rock, debris or sharp articles, with a minimum depth as shown in the Contract Drawings. Trench width must allow a minimum of 2 inches between parallel pipes. Do not stack pipes. Excavate trench bottoms with uniform slope of 1/2 percent standard minimum grade.Backfill any excess excavation with suitable materials in conformance with Sections 31 20 00, Earth Moving, and 32 90 00, Planting, which is free of rocks, organic material, or other materials that may damage pipe. Thoroughly compact to give full support to pipe. Backfill when pipe is not in an expanded condition due to heat or pressure. Place backfill material in 6-inch lifts and compact each lift. Backfill to ensure no future settlement of the trench. Thoroughly backfill around sprinklers and be especially attentive to the restriction of movement of sprinklers by external force. Repair all trench settlement during the warranty of this Contract. Backfill trenches uniform with the surrounding grade.Backfill irrigation sleeve trenches and mechanically compact in 2 lifts to a dry density equal to 95 percent of adjacent undisturbed soil. Backfill will conform to adjacent grades without dips, sunken areas, humps, or other surface irregularities.If settlement occurs and subsequent adjustments in pipe, valves, sprinkler heads, lawn or planting, or other construction are necessary, the Contractor shall make all required paction: Use hand-operated, plate-type, vibratory, or other suitable hand tampers in areas not accessible to larger rollers or compactors. Compact initial backfill material surrounding pipes and conduits to 90 percent maximum density. For pipes, conduits, and sleeves under roads or slabs, compact backfill as specified in Section 31 20 00, Earth Moving.PVC Pipe AssemblyHandle plastic materials carefully, store under cover and prevent damage to pipe. Provide support beds for full lengths of pipe when transporting and storing pipe. Do not install damaged or dented pipe.Cut PVC pipe square and remove burrs. Clean pipe and fittings using primer and cleaner recommended by PVC pipe manufacturer. Use tinted primer to aid in visual inspection.Apply a thin, even flow coat of slow drying, heavy duty PVC solvent cement to outside of male fitting. Cure joints as recommended by manufacturer and keep pipe and fitting out of service during curing period. Construct watertight joints equal to or greater in strength than pipe. Do not tap pipe and fittings.Wipe off excess solvent cement with a clean rag. Let welded joints cure at least 15 minutes before moving them and at least 24 hours before water is permitted into pipe.Install pipe fittings for sprinkler and quick coupler valve outlets horizontally and facing the exterior of the planting area.Sleeves:Place pipe to be installed under pavement and through site walls in a pipe sleeve that has an inside diameter not less than 2 inches larger than outside diameter of the pipe or the combined outside diameter of pipes installed.Sleeves through building walls shall have watertight seals.Backflow Preventer:Install unit as indicated on Contract Drawings. Verify exact location with the Resident Engineer before installation.The backflow prevention assemblies will be inspected and tested before use in accordance with the applicable portions of the Minnesota Administrative Code and other applicable regulations as set forth by the Minnesota State Department of Health and the City of Minneapolis. No water is to flow through the assembly until testing and inspection is accepted by the Resident Engineer.Inspections and tests shall be completed and the results recorded by a licensed Backflow Assembly Tester (BAT) Operator or by a Contracting Agency Certified Water Works Operator with a CCS-1 or CCS-2 Classification. Document that the devices are in good operating condition prior to flushing and testing of any downstream water pipes.Installations must be according to procedures outlined in the current edition of “Accepted Procedure and Practice in Cross-Connection Control Manual,”published by the Pacific Northwest Section, American Water Works Association.Irrigation Control ValvesBefore installation of irrigation control valves, thoroughly flush the mainline.Use valve box extensions by same manufacturer to ensure that box extendscompletely below the bottom of the valve. Install locking cover bolts.Install valve boxes perpendicular to walks and curbs.Stake location of valve boxes for acceptance by Owner’s Representative prior to installation.Sprinklers:Thoroughly flush lateral pipes and swing joints prior to installation of sprinklers.Install sprinklers as shown on Contract Drawings.Install sprinklers flush with finish grade adjacent to walks, and curbs as detailed. Lower heads to grade before completion of maintenance period.Install sprinklers a minimum of 2 inches and a maximum of 4 inches from hard surface edges.Upon completion of installation, adjust sprinklers to properly distribute water flow to all planting areas. Adjust adjustable sprinklers by fully opening sprinkler nozzle farthest from control valve. Open manual adjustment of control valve slightly to obtain a 24-inch-high spray at sprinklers noted above. After this condition has been met, adjust other sprinklers in that section for equal height sprays, regulating control valve as required to maintain condition. Adjust control valve to obtain catalog rate pressure for sprinkler installed. Rotate individual heads to keep sprays within areas of planting areas and eliminate overspray onto pavements, walls, site features and the building.Swing Joints: Connect sprinklers to laterals using a swing joint assembly as shown on Contract Drawings.Drip Irrigation:Install all dripline as indicated on Contract Drawings. Use only Teflon tape on all threaded connections. Make adjustments to alignments to accommodate large trees and shrubs. Ensure alignment adjustments do not reduce amount of water supplied to each plant.Install one 6-inch-long metal wire staple every 3 linear feet and 2 staples on each change of direction (tee, elbow, or cross).Dripline fittings shall be mated with dripline by pushing the fitting into the tubing while twisting side to side until the tubing abuts to either adjoining tubing or a fitting stop.Cap or plug all openings as soon as pipes have been installed to prevent the entrance of materials that would obstruct the pipe. Leave in place until removal is necessary for completion of installation.Thoroughly flush all water pipes before installing valves and other accessories.Pipe Sleeves:Place supply header pipes and dripline tubing in PVC Schedule 80 sleeving at least twice the pipe diameter under all paved areas, drives and roads.Extend sleeves 1 foot minimum beyond edge of curbs and pavement, cap ends and flag.Dripline Valves and Accessories:Automatic Flushing Valve: Install in valve box with a gravel sump adequate to drain 1 gallon of water.Air/Vacuum Relief Valve: Install on pipe perpendicular to dripline rows at high point of each zone. Install in valve box with gravel sump.I. Control Wire:Lay wires connecting controller and irrigation control valves in trenches with a minimum cover of 18 inches.Sleeve wire under pavement in Schedule 40 PVC pipe.Provide continuous wire runs without splices between controller and irrigation control valves. Splice only at control valves or junction box locations.Install 2 spare wires to run from the controller to the furthest ends of each branch of the mainline.Tape control wires together at 5-foot intervals with electrical tape. Tape this bundle to the bottom of the mainline at 10-foot intervals with at least 1 full wrap of duct tape. Tie a loose 24-inch loop in all wiring runs at changes of direction greater than 30 degrees. Untie all loops after all connections have been made.Irrigation Controller:Coordinate electrical service to controller location. For interior installation, wall mount controllers within vandal-resistant enclosure as indicated on Contract Drawings.Program irrigation system is to operate after plants have been installed, without conflict with other Work.INSPECTIONDo not cover installed work before the Resident Engineer has inspected installation. Uncover covered Work at no additional cost to Sound Transit.At completion of installation, and before planting of shrubs or groundcover, inspect overall coverage of system. Demonstrate the working pletely check system within 5 days before Final Inspection and make necessary corrections. Properly align heads and adjust to ensure full coverage. Clear system of foreign materials. Properly adjust valves. Check sprinkler controller valve chart for accuracy.At end of the Landscape Warranty Period, schedule a Final Inspection of the system with the Resident Engineer. If the Warranty Period ends during the freezing season (see 3.05 SYSTEM PROTECTION), schedule the Final Inspection within 10 days of reactivation of the irrigation system.TESTINGPerform tests in the presence of the Resident Engineer. Give at least 48 hours advance notice of tests.Hydrostatically test sprinkler pipes normally under pressure as follows:Leave all system joints, connections, and other fittings exposed until after completion and acceptance of pressure test. All subsequent breaches of integrity of the mainline shall require re-testing.Mainline: 120 psi static pressure for 1 hour. Test will fail if pressure loss occurs during the test. Ensure means of air release at terminations and bleeding of all trapped air.Lateral pipes: 80 psi for 30 minutes. Lateral test will include all swing joint assemblies with temporary threaded caps on the downstream Marlex fitting. Wrap caps with 3 wraps of Teflon tape. Ensure means of air release at terminations and bleeding of all trapped air. Test will fail if pressure loss is greater than 5 psi during the duration of the test.Test the entire system as a complete unit. Do not test in separate completed segments.Center load pipe with small amount of backfill to prevent arching and movement under pressure. Leave joints exposed for inspection during pressure test. No water is permitted in pipe for pressure testing until at least 24 hours has elapsed for solvent weld setting and curing.Test by capping each outlet, filling pipe with water, and applying pressure with a pump. Measure pressure with a pressure gauge. Maintain specified pressure for 1 hour and determine leakage. Immediately correct leaks, and subject system to same test. No pipe, fitting or joint showing leakage will be accepted. After piping has been tested to the satisfaction of the Resident Engineer, backfill pipe trenches before adjustment and testing of sprinklers and valves.Furnish necessary force pump and other test equipment.Irrigation Controller: Test controller for 7 days just before end of establishment period. Operate system automatically in manner indicated.Do not cover installed Work before the Resident Engineer has inspected installation. Uncover covered Work as directed by the Resident Engineer for testing.Drip irrigation: The Contractor must make a full inspection with the Resident Engineer of all components of the system, including the visual inspection of each emitter under operating conditions. Adjustments, flushing, cleaning of filters, replacements to the system must be made immediately to ensure the proper operation of each emitter. Once drip irrigation is successfully tested, cover the dripline as shown on the Contract Drawings.SYSTEM PROTECTIONDeactivate and drain (winterize) the system prior to the onset of the freezing season (no later than Nov. 15) and reactivate at the onset of the spring season (no earlier than April 15). Accomplish each as often as required during the construction, acceptance, and warranty period. If construction is completed when the system is not in use, winterize after testing. Certify by letter the dates of each winterization and activation. Repair damage from failure to comply.When using compressed air to winterize the system, do so in short cycles at no more than 40 psi air pressure. Do not allow pipe close to the compressor to get hot to the touch.CLEAN UPUpon completion of Work, clean up excess materials, equipment, and rubbish resulting from Work. Leave premises in a clean, neat and orderly condition.TRAININGThirty days prior to completion of the plant Warranty Period, the Contractor shall provide a course on the use, adjustment, and maintenance of the automatic controller and irrigation heads. The instructions shall include an on-Site review/walk through of the irrigation system(s) as well as an office session to review the O&M Manual documentation. If the Warranty Period ends during the freezing season, schedule the training within 10 days of the Final Inspection after reactivation of the irrigation system.Approximately 10 maintenance persons will attend the course. The Contractor shall schedule the course through the Resident Engineer at a time convenient to Sound Transit. The Contractor must notify the Resident Engineer of the proposed course dates at least 6 weeks before those scheduled dates.END OF SECTION 32 84 00 ................
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