City of Frisco Engineering Standards

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Version 6/19/12 B. Attach to top of 2" galvanized pipe 10 foot above grade and 2 feet below grade set in concrete. C. Paint pipe semi gloss black. D. Manufacturer: RAINBIRD or approved equal. PART 3 - EXECUTION 3.01 INSPECTION: A. Examine areas and conditions under which irrigation sprinkler system is to be installed. B. Verify that interfacing work specified elsewhere is complete. C. Notify Owner in writing of conditions detrimental to proper and timely completion of Work. D. Do not proceed until conditions are satisfactory. 3.02 INSTALLATION: A. General: 1. Compliance: Complete installation in strict accordance with manufacturer's recommendation, which shall be considered a part of these specifications. 2. Stake location of each sprinkler for approval of Owner before proceeding. Do not exceed manufacturer's maximum spacing limits. 3. Piping Layout: Piping layout is diagrammatic. Route piping around trees and shrubs to avoid damage to plantings. Do not dig within balls of newly planted trees and shrubs. 4. Discrepancies: a. Point out any discrepancy between the plans and the field conditions that may affect uniform coverage. Do not proceed until any design change made necessary by such discrepancy is approved by Owner. b. Should such changes create extra cost, approval for extra compensation shall be obtained in writing by Owner before commencing work. c. Should such changes create savings in cost, a written reduction in the contract price shall be approved in writing by Owner before commencing work. B. Excavations: Excavations are unclassified and include earth, loose rock, or combinations, in wet or dry state. Backfill trenches with material removed except if rock is encountered haul this material off site, and backfill to ensure a minimum of 3 inches of rock free soil surrounding pipe. C. Water Meter and Backflow Prevention: Refer to plans. 3.03 PIPE INSTALLATION: A. General: Width of trenches to be approximately twice as large as the pipe diameter. City of Frisco May 2012 Standard Technical Specification Irrigation System 328000-8
Version 6/19/12 B. Mainline and Lateral Piping: Install with 12 inches of soil cover over laterals and 24" coverage over 8" mainline and 18" coverage over 6" and small mainline. C. Trenching: Provide firm, uniform bearing for entire length of pipe to prevent uneven settlement. Wedging or blocking of pipe is not permitted. Remove foreign matter from inside of pipes before assembly. Keep inside of piping clean during and after layout of pipes. D. Backfill: Water jet and compact to 90% to prevent after-settling. Hand rake trenches and adjoining areas to leave grade in condition equal to before installation. 3.04 PVC PIPE AND FITTINGS ASSEMBLY: A. Solvent: Use solvent and procedures recommended by manufacturer to make solvent-welded joints. Thoroughly clean pipe and fittings before applying solvent. B. PVC to Metal Connections: Use Teflon tape. C. Threaded PVC Connections: Use threaded PVC adapters into which pipe may be welded. Use Teflon tape on threads. 3.05 ELECTRICAL VALVES: A. Provide valves in accordance with materials list and size according to plans. B. Install valves in a level position in accordance with manufacturer's specifications. C. Provide plastic valve box, centered over valve, flush with finish grade. Provide valve box extensions as required. D. Install 0.5 cubic feet washed pea gravel in bottom of valve box. 3.06 SPRINKLERS: A. General: Provide in accordance with materials list with nozzle in accordance with plans. Change nozzle degree and trajectory if wind conditions affect coverage. Receive approval from the Owner prior to any change. Install heads adjacent to walks and curbs 2 inches clear of paving. B. High-Pop Shrub Heads: Provide nozzles as indicated in 2.15 twelve (12”) inch pop-up body. Attach to lateral piping with ½” . . Firmly tamp soil around base plate and leave head plumb. Underside of flange shall be set flush to 1" above finish grade. C. Lawn Heads: Attach sprinklers to lateral piping with flex PVC pipe. Firmly tamp soil around base plate and leave head plumb. Underside of flange shall be set flush to 1/4" above finish grade in hydro seeded areas and 1" above finish grade in solid sodded areas. D. Rotary Heads: Install as detailed on the plans on swing joints. Follow manufacturer's assembly and installation procedure. Set heads flush with finish grade or sod. 3.07 QUICK COUPLING VALVES (QCV): Provide in accordance with materials list and as detailed on plans. Stake with a 1" galvanized pipe. City of Frisco May 2012 Standard Technical Specification Irrigation System 328000-9
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City of Frisco Engineering Standards

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