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HomeMy WebLinkAbout2951-4IRRIGATION SPECIFICATIONS B. Remote control valves: 3.02 TRENCHING Valves shall be as shown on the drawings. Connect the A. Dig trenches and support pipe continuously on bottom of controller in the operating sequence indicated on the ditch. Lay pipe to an even grade. Trenching excavation PART 1 - GENERAL drawings. shall follow layout indicated on drawings to the depths 3. below finished grade and as noted. 2.06 VALVE BOXES B. Provide minimum cover of 30 inches over pressure.supply A. Valve boxes shall be fabricated from a durable, weather- lines under paved areas. 1.01 SCOPE - resistant plastic material resistant to sunlight and The work required is indicated on.the drawings and includes, chemical action of soils. C. Provide minimum cover of 18 inches over pressure supply but is not limited to irrigation systems, automatic control- lines 2-1/2 inches and smaller. ler, remote control valves, quick coupler valves, and water B. The valve box cover shall be secured with a hidden latch D. Provide minimum cover of 18 inches over control wires, 31 and electric connections. r mechanism or bolts. C. The cover and box, shall be capable of sustaining a load E. Provide minimum cover of 12 inches over nonpressure 1.02 TESTS of 1,500 pounds, lines. A. Coverage test: D. Valve box extensions' shall be by the same manufacturer 3.03 BACKFILLING When the sprinkler system is completed, prior to backfill- as the valve box. A. Initial backfill on all lines shall be of fine granular ing trenches, Contractor shall perform a coverage test to is E. Gate valve bores shall be round plastic boxes with bolt- material with no foreign matter larger than 1/2 inch in determine i# the water coverage for planting areas tom- ple.te and adequate. This test shall be accomplished before down covers marked "GATE VALVE". size. any planting. - F. Remote control valve boxes shall be rectangular plastic B. Backfill shall be tamped in 4 -inch layers under the pipe 3• B. Hydrostatic tests: boxes with bolt -down covers marked with the valve and uniformly on both sides for the full width of the the full length of the pipe. Materials shall identification number stenciled in 2 -inch -high letters/ trench and All pressure lines shall be tested under a hydrostatic numbers using epoxy resin base paint of a contrasting be sufficiently damp to permit thorough compaction, free Backfill be compacted to dry density e- pressure of,150 psi for a period of not less than �! hours. color. of voids. shall qual to adjacent undisturbed soil and shall conform to 1.43 TURNOVER ITEMS 2.07 AUTOMATIC CONTROLLER adjacent grades. 3.J A. Controller charts: Automatic controllers shall be as indicated on the drawings C. Flooding in lieu of tamping is not allowed without spe- "- complete with hookup to electrical sources. All controllers cific prior approval. Provide one controller chart (of the maximum size control- shall be enclosed in a vandal -resistant, waterproof enclos- ler door will allow) for each automatic controller. Chart ur-e, LeMeur or approved equal, or as shown on the drawings. D. Under no circumstances shall truck wheels be used to shall show the area covered by controller. compact soil. 2.08 ELECTRICAL - PRIMARY B. Operation and maintenance manuals: E. Provide sand backfill a minimum of 6 inches over and un- 3. A.. All electrical equipment shall be NEMA Type 3, water- der all piping under paved.areas. Two individually bound copies of operation and maintenance proofed for exterior installations. manuals shall be delivered to the Owner. 3.04 PIPING B. All electrical work shall conform to local codes and C. Supply as part of this contract the following items: ordinances. Above ground wires shal-1 be conduit en- As closed. (a) Two keys for each automatic controller. 2.09 WIRING - LOW VOLTAGE (b) One valve box cover or wrench. B. Cutting or breaking of existing pavement is not per - A. Remote control wire shall be direct -burial AWG -UF type, muted without written permission from the Owner. 1.04 GUARANTEE sized according to manufacturer's specifications. C. Install pipe with all marking up for visua'I inspection A. The.entire sprinkler system, including all work done B. Connections shall be either epoxy -sealed packet -type or and verification. under this contract, shall be guaranteed by the Con- Scotch Lock connectors. tractor against all defects and fault of.material and D. Remove all dented and damaged pipe sections. workmanship, for (1) one year from date of final C. Ground wires shall be white in color. Control wires inspection. shall be a different color for each station, for each E. Contractor shall install concrete thrust blocking at all controller. changes of direction and terminal points of pressure B. The Contractor shall instruct the Owner's Representative �� G !D .. in the operation and maintenance of the system and 2.10 SPRINKLER HEADS shall furnish a complete set of operating instructions. F. All lines shall have a minimum clearance of 4 inches . Sprinkler heads shall be as indicated on the drawings. from each other and 6 inches from lines of other trades. 2.11 IRRIGATION SLEEVES G. Parallel lines shall not be installed directly over one PART' 2 — MATERIALS another' Irrigation sleeves shall be SDR -35 ABS sewer pipe, non- perforated. H. Make all joints in strict accordance with the manufac- turer's recommended methods; allow solvent welds at least 15 minutes setup time before moving or handling 2.01 GENERAL and 24 hours curing time before filling. Materials or equipment installed or furnished that do not PART 3 — E X E G U TION I. All threaded plastic -to -plastic connections shall be as - meet -these standards will be rejected and shall be removed ° sembled using Teflon tape. . from the site at no expense to the Owner. J. For plastic -to -metal connections, use non -hardening pipe 2.42 GALVANIZED STEEL AND FITTINGS - - - 3.41 GENERAL INSTALLATION dope on all threaded plastic -to -metal connections, ex - cept where noted otherwise. A. All -galvanized steel pipe shall be Schedule 40 ' A.. Water Supply: threaded, coupled, and hot -dipped galvanized, and K. Piping shall be snaked from side to side of trench shall comply with the requirements of ASTM A120-66 Connections to proposed water meter (meter installation p bottom to allow for expansion•and-contraction. or ASTM A53-67, by others) shall be at the location shown on the draw - ings. Minor changes caused by actual site conditions 3.05 ASSEMBLIES B. All fittings for galvanized steel pipe shall be 154- shall be made at no additional -cost to the Owner. pound rated galvanized malleable iron, banded pattern. A. Install all assemblies specified herein according to the B. Layout: respective detail drawings or specifications, using best C. Pipe sizes indicated on the drawings are nominal inside standard practice. diameter, unless otherwise noted. Layout irrigation systems and make minor adjustments required due to differences between site and drawings. B. Install backflow, assemblies in shrub areas and/`or adjacent 2.03 PLASTIC PIPE AND FITTINGS Where piping is shown on drawings under paved areas, but to other hardscape items rather than turf areas, when pos- running parallel and adjacent to planted areas, install Bible, and at height required by local codes. All plastic pipe shall bear the following markings: A. l p p P the piping in the planted areas. manufacturer's name, nominal pipe size, schedule or C. Valves shall be installed in shrub areas whenever class, type of material, pressure rating in psi, NSF C.. _Diagrammatic Intent: possible. seal of approval, and the date of extrusion. The drawings are essentially diagrammatic. The size and D. Each valve box shall be installed on a foundation of pea B. Pressure supply lines 1-1/2 inches and smaller down- location of equipment and fixtures are drawn to scale gravel backfill one cubic foot minimum. Valve boxes stream of the backflow prevention unit shall be Sche- where possible. Provide offsets in piping and changes shall be installed with their tops one inch above the dule 40 PVC. Pressure supply lines 2" and larger shall PP Y g in equipment locations as necessary to conform with surface of surrounding finish grade in shrub area, and be either Class 315 solvent weld PVC or Class 200 rubber structures and to avoid obstructions or conflicts with flush with turf areas. gasket type PVC. Solvent weld and ring type pipe shall other work. not be used together on the same pressure supply line. 3.06 CONTROLLER D. Grades: C. Nonpressure.lines shall be Class 200 PUC. A. Controller shall be located behind shrubs and/or adja- Before starting work, carefully check all grades to de- cent to other hardscape items. MaaintenanceIaccess shall D. All fittings shall be standard weight Schedule 40 and termine that work may safely proceed, keeping within the - �e,__Fprw.ld_ed _._- shall be injection molded of an improved PVC fitting specified material depths with respect to finish grade. compound. Threaded plastic fittings shall be injection B. The irrigation system shall be programmed to operate molded. E. Inspection: during the periods of minimal use of the design area. E. All threaded nipples shall be standard weight Schedule (1) Prior to all work, of this section, carefully in- C. The controller shall be programmed so that each valve 80 with molded threads unless otherwise specified. spect the installed work of all other trades and operates separately. verify that all such work is complete to the point F. All solvent cementing of plastic pipe and fittings shall where this installation may properly commence with- 3.07 WIRING be a two-step process, using primer and solvent cement out conflicts. applied per the manufacturer's recommendations. Cement ' A. Wiring shall occupy the same trench and shall be shall be of a fluid consistency, not gel -like or ropy. (2) Verify. that the irrigation system may be installed installed along the same route as the pressure supply y Primer and solvent shall be applied to .BOTH mating sur- in strict accordance with all pertinent codes and lines wherever possible. fadeso regulations, the original design, the referenced J standards, and the various manufacturer's.recom- B. Where more than one wire is placed'in a trench, the .04 A KF W PR V NT N T 2 B C LI E E-- mendations. wiring shal I be taped -together at intervals of 12 feet. Backflow unit shall be as shown on the drawings. . F. Discrepancies: C. All connections shall be of an approved type,. and shall occur in a valve box. Provide an le --inch service loop 2.05 VALVES Do not proceed with installation in areas of discre- at each connection. panty until all discrepancies -have been resolved. A. Gate valvess D. An expansion loop of 12 inches shall be provided at each G. Field Measurements: wire connection and/or directional turn, and one of 24 (�; Gate valves 2 inches or smaller shall have screwed inches shall be. provided at each remote control valve. joints and brass bodies. Make all necessary measurements in the field to ensure precise fit of items 'in accordance with the original de-+' E. A continuous run of wire shall be used between the con- - t2) All gate valves shall have a minimum working ;res- sign. troller and each remote control valve. Under no circum - sure of not less than 150 psi and shall conform to sure stances shall splices be used without prior approval. AWWA F. Spare control wires shall be run to valve box locations as shown on the plans. Provide an 18 inch expansion loop at valve box. O8 FLUSHING THE SYSTEM A. Prior to installation of sprinkler heads, the valves shall be opened and a full head of water used to flush out the lines and risers. B. Sprinkler heads shall be installed after flushing the system has been completed. 49 SPRINKLER HEADS A. Sprinkler heads shall be installed.as designated on the drawings. B. Spacing of heads shall not exceed maximum indicated on the drawings. C. Head height in relation to finish grades shall be as in- dicated on the drawings at the time of completion. 10 ADJUSTING THE SYSTEM A. Contractor shall adjust valves, align heads of each system to maximize coverage and minimize overspray prior to planting. 1 IRRIGATION SLEEVING TWEhIPY er------- - ---- gation sleeves. B. See 3.02 (TRENCHING) and 3.03 (BACKFILLING) for further information. 32 COMPLETION CLEANING Upon completion of work, Contractor shall smooth all ground surfaces; remove excess materials, rubbish, debris, etc.; sweep adjacent streets, curbs, gutters, walkways, and trails; and remove construction equipment from the premises. ,`�Qti AQPE 4t '� A. -4 sit"Wre r�� Im V� DR: 2-100-97 lob no• ` 97-05 DRflWn bY' L.B. VVISionS ' Sf1ffT nUAfSf Q e4 O