981 Payment will be based upon the length of the landscaping establishment period, as specified in the Special Provisions. Partial payments may be made for landscaping establ ishment when the work is paid for at a contract lump sum price. Partial payment will be made only when the following work is completed prior to submittal of the monthly estimate:
inspection; and
work schedule. No measurement or payment will be made for the water, the cost being considered as included in the price of the contract item. 808- 1 Description: The work under this section shall consist of furnishing all materials, equipment, tools and labor necessary to install a complete and functioning water distribution system and/or a complete and functioning landscape irrigation system in accordance with the details and at the locations shown on the project plans and the requirements of these specifications. Water distribution plans are, i n general, diagrammatic. The exact location of component units of the water distribution system will be specified by the Engineer. The following water distribution terms, conditions, and component descriptions shall apply for installation of water distribution systems and/or landscape irrigation systems:
under constant pressure;
to a water storage facility and may or may not be under constant pressure;
(manual or automatic) and a pressure regulating device and not under constant pressure; TABLE OF CONTENTS INDEX 982
or pressure regulating device and not under constant pressure; and
number of calendar days specified in the Special Provisions. Phasing of the project, when necessary, shall be as specified in the Special Provisions. 808- 2 Materials: 808- 2.01 Components:
Backflow prevention units shall be atmospheric, pressure or reduced pressure type and the size as specified. Backflow preventers and components shall conform to applicable codes, regulations, the project documents and the performance requirements of the Foundation for Cross Connection Control Research, University of Southern California. All testing of backflow prevention devices shall be as specified by t he Foundation for Cross Connection Control Research, U.S.C. Atmospheric and pressure type units may also be referred to as atmospheric vacuum breaker or pressure vacuum breaker.
Atmospheric backflow preventers shall be all bronze body construction, non- spilling type with full size orifice, molded plastic or composition float disc. All units shall have female I.P.T. inlet and outlets sized as shown on the project plans and/or as specified in the Special Provisions. Atmospheri c units shall be rated to 125 pounds per square inch working pressure (minimum) and shall withstand water temperatures of 33 to 110 degrees F. The unit shall be installed with the air inlet in a level position.
The pressure backflow preventer body and bonnet shall be bronze, and the air inlet hood or canopy shall be stainless steel or brass. Internally, the spring shall be stainless steel, the float shall be polyethylene and the vent and check discs shall be silicone rubber. Internal components of the unit shall be serviceable without removal of the unit from the piping. Pressure type units shall be rated to 150 pounds per square inch working pressure and shall withstand water temperatures of 33 to 210 degrees F. TABLE OF CONTENTS INDEX 983 Pressure backflow preventers shall incorporate one spring loaded check valve which will close tightly when flow through the unit drops to zero and shall have an air relief valve that opens to break siphon when the internal pressure drops to 1 pound per square inch. Each backflow device shall be manufacturer equipped with bronze- bodied, resilient seat shut -off valves on the inlet and outlet of the device and two ball -type test cocks.
The reduced pressure backflow preventer shall consist of two independently operating check valves, an independent relief valve, resilient seat inlet and outlet, full port ball type shut -off valves and test cocks. The unit shall be designed for installation in a normal horizontal flow attitude. The i ndependent relief valve shall be located between the two check valves. The backflow preventer shall include an integral sensing system that will automatically open the relief valve whenever the pressure upstream of the first check valve drops below 3 pounds per square inch greater than the pressure in the zone between the two check valves. The relief valve shall remain open until a positive pressure differential of 3 pounds per square inch is reestablished. The sensing passage shall be located within the unit housing to protect against accidental damage or crimping. To assure maximum size passageway, snubber or other restrictive elements shall not be used. In the event that pressure upstream of the first check valve drops to atmosphere or below, the construction of the unit shall be such that during the normal operation of the device, the level of water in the zone between the two check valves shall be lowered to create within the unit an internal air gap which is greater than the diameter of the inlet pipe. Both check valves and the relief valve shall be spring loaded poppet type of modular design such that the complete assembly including valve, spring and seat may be removed and replaced using low cost replacement kits. All parts shall be made from corrosion resistant materials. The design shall place the sensing diaphragm and passage within the unit housing to eliminate danger of malfunction due to mechanical or vandalism damage. The backflow preventer shall conform to the following material, pressur e and temperature range requirements: TABLE OF CONTENTS INDEX 984 Body Bronze Check Valve Enclosures Glass Filled Noryl Valve Disc EPT Rubber Diaphragm Buna N and Nylon "O" Rings Buna N Springs Stainless Steel Screws Stainless Steel Maximum Working Pressure 150 psi Hydrostatic Test Pressure 300 psi Temperature Range 33 °F – 210 °F
Construction of the backflow prevention unit shall be such that any minor leakage at the second check valve will result in a visible flow from the relief valve even if the first check valve is totally disabled. Each reduced pressure backflow preventer shall be factory assembled and tested prior to delivery.
Gate valves shall be the type and size specified on the pr oject plans or in the Special Provisions. Identification of the valve by trade name, manufacturer and/or model number shall be stamped or cast on the valve body or on a permanently attached metal plate or tag. Unless otherwise specified, valves installed above ground shall be equipped with handwheels. Valves installed below grade shall be equipped with an operating nut or a cross handle, except a gate valve installed adjacent to a remote control valve, which shall be equipped with a handwheel. A minimum of one operating key or wrench shall be provided for each size operating nut or cross handle.
Gate valves 3 inches or smaller shall be Class 125, bronze body, nonrising stem type with solid disc, screwed bonnet and required operator. The bronze components of the valve shall conform to the requirements of ASTM B62 with the exception of the stem which shall conform to ASTM B371, Alloy 694. The handwheel, where required, shall be non- corrosive metal. Valve end connections shall be as specified in the Special Provisions or as detailed on the project plans.
Gate valves 4 inches or larger in size shall be iron body, bronze mounted and shall conform to the requirements of Federal Specification WW -V- TABLE OF CONTENTS INDEX 985 58 Class 1, Type 1, for Class 125 valves having non- rising stem, bolted bonnet and solid wedge configuration. End connections and required operator shall be as detailed on the project plans and/or as specified by the Federal Specifications.
The quick coupling valve shall be bronze or brass with a 3/4- inch iron pipe size (I.P.S.) female inlet connection unless otherwise specified or detailed. The valve body shall be of two- piece construction with single slot and spring loaded self -closing valve with metal or rubber cover. All 3/4-inch quick coupling valves shall have a flow range of 10 to 20 gallons per minute and an operating pressure range of 5 to 125 pounds per square inch. All quick coupling valves shall be of a single manufacturer. Two quick coupling keys appropriate to the valve shall be provided for each 10 valves installed. Quick couplers shall be installed on an approved swing joint riser assembly consisting of two PVC male adapters with Acme threads and elastomer seals, one polyvinyl chloride (PVC) 90- degree street elbow with male and female Acme threads and two PVC 90- degree elbows with socket by female Acme threads. Necessary pipe, fittings and/or nipples shall be PVC Schedule 80; with the length as required. Swing joint assembly shall be capable of withstanding a working pressure of 200 pounds per square inch at 73 degrees F.
The remote control valves shall be the types and sizes specified. The manufacturer's name and identification shall be cast molded or stamped on the valve body or on a permanently attached metal plate or tag. Valves shall have a minimum service rating of 150 pounds per square inch. Valve bodies, bonnets and component parts shall be as specified herein or in the Special Provisions. All valves shall have accurately machined or molded valve seat surfaces and internal parts. End connections shall be machined or molded female I.P.S. thread unless otherwise specified. Electrically operated valves shall be fully compatible and fully functional in all modes with the automatic controller device specified for the project.
The plastic remote control valve shall be a normally closed, 24- volt A.C., 50/60- cycle, solenoid- actuated globe pat tern, diaphragm -type valve capable of regulating water flow for the specified system operation. Valve pressure rating shall not be less than 200 pounds per square inch. TABLE OF CONTENTS INDEX 986 The valve body and bonnet shall be constructed of glass filled nylon with the handle, rings and diaphragm hardware of Acetal. Diaphragm shall be constructed of nylon reinforced Nitrile rubber. "O" rings shall be Ethylene Propylene rubber. Valve stem shall be brass and all studs and flange nuts shall be stainless steel. The valve shall be actuated by a low power, epoxy encapsulated 24- volt A.C., 50/60 -cycle solenoid with an in- rush power requirement of 0.41 amperes (9.9 VA) and a holding current of 0.23 amperes (5.5 VA). Control water pressure for the solenoid actuator shall be delivered from the inlet of the valve to the actuator by means of an internal or external passage particular to the valve size. Each valve shall be equipped with a manual on- off control and flow adjustment control. Manual operation of the valve shall be by manual internal or external bleed. The valve construction shall be such as to provide for all internal parts to be removable from the top of the valve without disturbing the valve installation.
The brass bodied remote control valve shall be a normally closed, 24- volt A.C., 50/60 -cycle, solenoid- actuated globe pattern, diaphragm -type valve capable of regulating water flow for the specified system operation. The valve body and bonnet shall be constructed of heavy cast brass. The diaphragm shall be nylon reinforced nitrile rubber. The valve stem and cross handle shall be brass and all studs shall be stainless steel. The internal seat spring shall be stainless steel. The valve shall be actuated by a low power, epoxy encapsulated 24- volt A.C., 50/60 -cycle solenoid with an in- rush power requirement of 0.41 ampere (9.9 VA) and a holding current of 0.23 ampere (5.5 VA). Control water pressure for the solenoid actuator shall be delivered from the inlet of the valve to the actuator by means of an internal or external passage particular to the valve size. Each valve shall be equipped with a manual on- off control and flow adjustment control. Manual operation of the valve shall be by manual external bleed. The valve construction shall be such as to provide for all internal parts to be removable from the top of the valve without disturbing the valve installation. TABLE OF CONTENTS INDEX 987
The automatic controller shall be electro- mechanical, electro- mechanical semi solid- state or microprocessor based / micro electronic solid -state type, and capable of fully automatic or manual operation of the irrigation system. The controller shall be housed in a wall or in a steel or metal cabinet which is lockable, pedestal mountable and waterproof. The type or t ypes of auto controllers shall be as detailed on the project plans or as specified in the Special Provisions. The controller shall operate on a minimum of 117 volts A.C. power input and shall be capable of operating 24 -volt A.C. electric remote control valves.
The 24- volt control and ground wire for operation of remote control valves shall be AWG size, UL approved, 600- volt, type UF single conductor wire with 60- mil PVC insulation. All control ("hot") wiring shall be a contrasting color to the white common or ground wire. Black wire will not be acceptable for use on any 24- volt control circuit. Control wires to water distribution valves used for shrubs shall be a different color than those used for trees. Wire color sh all be approved by the Engineer. Control and ground wire sizes shall be the sizes indicated on the project plans. Individual control wires shall be installed to each remote control valve. Common wire installation shall be as detailed on the irrigation system master plan.
The pressure gauge, portable or permanently mounted, shall be suitable for use with water and have a 2-inch diameter case with hermetically sealed neoprene cover, molded- in diaphragm and a shatterproof crystal. Pressure gauges shall have a range of zero to 60 pounds per square inch, unless otherwise specified. Portable pressure gauges shall be equipped with rubber hose and "tire chucks" capable of attachment to Schrader valves located at various pressure- check locations t hroughout the project for purposes of verifying pressures and making adjustments as necessary. Permanently mounted pressure gauges shall be equipped with external or internal pulsation dampeners. All permanently mounted gauges shall be equipped with resilient seat, shut -off valves.
The insulation shall be 1-inch thick, all -service jacket, heavy density glass fiber, sectional pipe insulation with vinyl coated, embossed, vapor TABLE OF CONTENTS INDEX 988 barrier laminate. The jacket shall have a pressure sensitive, self -sealing lap. All insulation shall receive an exterior protective cover of 0.016- inch aluminum secured with 3/8- inch aluminum straps located 6 inches center to center.
Plastic pipe and fittings shall conform to the requirements of the National Sanitation Foundation and bear their stamp. Materials used in t he manufacture of PVC pipe and fittings shall conform to the requirements of ASTM D1784, Class 12454- B. PVC pipe shall conform to the requirements of ASTM D2241 for SDR -PR pipe and ASTM D1785 for Schedule 40 and Schedule 80 pipe. The pipe classification and the pressure rating will be specified on the project plans or in the Special Provisions. PVC pipe, unless otherwise specified, shall be plain- end solvent weld or bell-end solvent weld. Bell -end solvent weld pipe shall conform to the requirements of ASTM D2672. PVC piping shall be assembled with solvent weld, socket type fittings. All PVC fittings shall conform to one or more of the following requirements:
and/or
Galvanized and black steel pipe shall conform to the requirements of ASTM A53. All threaded steel pipe fittings shall be heavy pattern, banded, malleable iron with a rating of 150 pounds per square inch working pressure. Fittings shall be galvanized or black steel appropriate to the piping being used. Flanges or flanged fittings, where specified, detailed or required, shall be Standard, Class 125 or Extra Heavy, Class 250 conforming to ANSI B 16.1. The type of pipe and fittings which shall be used will be specified on the project plans or in the Special Provisions. TABLE OF CONTENTS INDEX 989
All copper pipe shall be rigid or non- rigid copper, Type K Standard, meeting the requirements of Federal Specification WW -T 799 and ASTM B88. Fittings shall be standard copper, wrought and cast. Solder shall be of the lead free type. 808- 2.02 Water Distribution System: Water distribution systems which include unique or variable components not listed in Subsection 808- 2.01 of the specifications shall conform to the component r equirements specified in the Special Provisions. 808- 2.03 Landscape Irrigation System: Landscape irrigation systems which include unique or variable components not listed in Subsection 808- 2.01 of the specifications shall conform to the requirements specified in the Special Provisions. 808- 3 Construction Requirements: 808- 3.01 Materials and Equipment: By the time of the preconstruction conference, the contractor shall submit the manufacturer's product sheets of the materials and equipment it proposes to use to the Engineer ele ctronically . In addition to the electronic submission, the Engineer may request up to three hard copies. The contractor shall have materials and equipment correctly marked on each copy of the manufacturer's product sheets. These product sheets shall also show the catalog numbers, manufacturer's name, m odel numbers, sizes, capacity, complete specifications, instructions, design data and/or drawings, to determine whether or not each piece of material or equipment is acceptable and to assure that all such materials and equipment, when incorporated into the work, is in accordance with the project plans and the specifications. The contractor's failure to comply with these material submittal instructions will not constitute a time extension. No material or equipment shall be ordered and work shall not begin until the material and equipment has been approved, in writing, by the Engineer. All water distribution system equipment shall be installed in accordance with the instructions of the manufacturer, the project plans, and specifications. The contractor shall provide the Engineer each manufacturer's installation instructions electronically. In addition to the electronic submission, the Engineer may request up to three hard copies. TABLE OF CONTENTS INDEX 990 All irrigation construction materials for single use on the projects shall be supplied from a single manufacturer, unless otherwise specified in the Special Provisions. 808- 3.02 Permits, Warranties , and Guaranties : Any warranty, guaranty, operation and/or maintenance manuals provided by the manufacturer for any item shall be furnished to the Engineer prior to final acceptance of the project or prior to the land scape establishment phase, when the project includes landscape establishment phase or upon request by the Engineer. All permits for installation or construction of any of the work included under Section 808 of the specifications, which are required by legally constituted authorities having jurisdiction, shall be obtained and paid for by the contractor, each at the proper time. The contractor shall also arrange for and pay all costs in connection with any inspections and examinations required by these authorities. No measurement or direct payment will be made for any permits, the cost being considered as included in the price of the contract items. 808- 3.03 General Requirements: Any use of potable water by the contractor shall be through approved backflow pr evention devices. All backflow prevention devices shall be in place, tested and approved for use by the Engineer prior to the contractor using any water from the municipal water system. Prior to beginning trench excavation, the contractor shall lay out the system or systems for the approval of the Engineer by providing approved indicators at the location(s) of major components such as piping runs, valves, pumps, backflow preventers and tanks. Under no circumstances shall shut- off valves of any type be installed downstream from any atmospheric type backflow prevention device. With the exception of reduced pressure type, backflow preventers shall not be subject to back pressure. Structures and enclosures shall be indicated as directed by the Engineer. The contractor shall locate any existing water distribution system piping and appurtenances within the limits of the project which will be affected by new system construction and/or revisions. Utility connections, both water and electrical, shall be as shown on the project plans or as determined by the utility company. Unless specifically exempted in the plans or specifications, the contractor shall be responsible for all costs to provide these services. The contractor shal l assume full responsibility for the correct installation of the water distribution system, as herein specified, and unless it can show past experience of installing this type of system, it shall arrange TABLE OF CONTENTS INDEX 991 with the manufacturer for the services of a qualified manufacturer's representative to be on hand at the start of the installation and as necessary during the installation and testing of the system. All materials and fittings shall be new, of manufacturer's most current design, and shall bear the appropriate national association's seal of approval; for example, NSF and UL. Similar parts shall be procured from the same manufacturer, and internal parts shall be common and interchangeable. Parts listing and source of supply for replacement parts shall be furnished to the Engineer. The contractor shall provide two complete manuals of all materials, equipment, parts, and manufacturer's installation, maintenance and owner manuals, to the Engineer prior to final project acceptance. All enclosures shall remain closed and locked, and all valve box covers shall be in place throughout the construction and landscaping establishment periods, except when actual work is in progress on the respective unit. The contractor shall furnish sufficient numbers of pressure gauges with tire chucks, which shall be used in the testing and necessary adjustment of the emitter system during construction and landscaping establishme nt. All pressure regulators shall be tested at 90- day intervals throughout the construction phase and landscape establishment phase of the contract. Regular tests shall be performed a minimum of three working days prior to regularly scheduled project inspections. Plastic pipe shall be delivered to the site in unbroken bundles or packages and shall be wrapped such that pipe ends are adequately protected. If the pipe is delivered from a local warehouse, the pipe need not be bundled or wrappe d. Upon delivery to the site, the contractor shall inspect all pipe for possible shipping damage. Shipping straps shall be removed to prevent damage due to expansion in hot weather. All copper pipe required to install the backflow prevention unit or ferti lizer injector assembly shall be type "K," hard drawn, of the size shown on the project plans. Copper fittings shall be wrought or cast, and of the configuration and size shown on the project plans. All PVC pipe and fittings shall be stored as recommended by the manufacturer and as directed by the Engineer. All PVC pipe shall be covered to prevent exposure to sunlight. Sufficient air space shall be provided between the opaque covering material and the pipe to prevent undue heat buildup and retention. TABLE OF CONTENTS INDEX 992 PVC pipe which has been discolored by exposure to sunlight or has been scratched, scored or otherwise damaged in handling will not be acceptable. Plastic pipe and fittings shall be installed in accordance with the requirements specified herein and the manufacturer's recommendations. Any PVC fitting or nipple marks from any device other than a strap tightening wrench shall be removed and replaced with a new component. Any system replaced shall be retested as herein specified. No water distribution system main piping, laterals, other piping, or other components shall be installed through or beneath new or existing plant pits or plant material. The minimum distance between the plant pit and piping shall be 12 inches. Maximum distance between the plant pit and piping shall be determined by maximum supply lengths as specified on the project plans. Additional flushing of the irrigation system, in addition to those specified, may be required by the Engineer to assure proper function of the system, including emission points. Testing of the irrigation system valves shall be performed at system operating pressure or 60 pounds per square inch, whichever is greater. Trenches shall be excavated to uniform grade and shall be no wider than is necessary for the proper installation of the pipe, fittings and control wiring. The bottom of the trench shall be firm and free from large or sharp rocks. Where pavement or other impervious material is encountered in the excavation of trenches, such material shall be removed and wasted, as approved by the Engineer. No separate payment will be made for removal and disposal. All pipe, fittings and system components shall be clean prior to installation and shall be maintained in that condition during installation. Plastic pipe shal l be uniformly bedded and covered to the depth indicated on the project plans. Bedding and backfill material shall be compacted by approved water settlement methods and, after backfilling has been completed, the surface shall be brought to the elevation of the adjacent ground. The contractor shall select a 100- foot section of mainline which has been installed and backfilled as a test portion to be water settled for the Engineer's approval of the water settlement method. The test shall be completed and ap proved prior to proceeding with the remainder of the project. Requirements for slack or "snaking" of PVC pipe shall be in accordance with the pipe manufacturer's recommendation. PVC pipe and fittings TABLE OF CONTENTS INDEX 993 shall be clean prior to installation and shall be maint ained in that condition during installation. Where two or more piping systems are indicated on the project plans as adjacent, they shall be placed within a common trench and at the depths indicated. Where threaded plastic to metal or plastic to plastic connections are required, the metal connections shall be worked first. A non- hardening, manufacturer recommended sealant/lubricant compatible with the plastic fittings and/or components shall be used and the joint shall be hand tightened with the final tight ening not to exceed one turn with a strap wrench. Threaded PVC Schedule 80 nipples, thread- one- end (T.O.E.) and PVC Schedule 80 couplings, solvent weld, shall be used where threaded plastic connectors are required. Threaded PVC male or female adapters are not acceptable, unless otherwise specified. Cement, solvents, thinners and joint compounds shall be compatible with and of the kind recognized by the industry as proper for use with the plastic pipe and fittings involved. Solvent weld pipe and fittings shall be assembled using appropriate primers and solvents designated by the manufacturer for use with Schedule 40 and/or Schedule 80 fittings. All wire connections for No. 10 or larger shall be wrapped in accordance with the requirements of Subsection 732- 3.02(B) of the specifications. All control valve boxes and pressure regulator boxes shall be labeled with a brass tag acceptable to the Engineer. All wire shall be tagged in accordance with the requirements of Subsection 732- 3.02(C) of the specifications. Flexible conduit shall be supported within 12 inches of any cabinet or fitting in accordance with the requirements of NEC 350 and in a workmanlike manner acceptable to the Engineer. All surfaces or components requiring protective paint shall receive the finish as specified in Sections 610 and 1002 of the specifications, and as determined by the Engineer. The contractor shall furnish and install a steel post to mark the ADOT end caps, in accordance with Standard Drawing 4- M-4.01, to a height of 30 inches without the reflector. At no time shall any plant material, new or existing, be allowed to remain without water for any period which will result in stress to the plant material. Any damage to plant material because of lack of water shall be rectified at no additional cost to the Department. TABLE OF CONTENTS INDEX SECTI ON 808 994 Water distribution and/or irrigation systems shall be installed, tested, operational and approved by the Engineer prior to installation of any new plant material. Flush end caps shall be installed as shown on the project plans or as directed by the Engineer to promote good flushing of the entire irrigation system. Additional flushing of the irrigation system, in addition to those specified, may be required by the Engineer to assure proper function of the system i ncluding emission points. 808- 3.04 Bedding and Cover Material: Bedding and cover material for PVC piping, flexible emitter hose and 24- volt wiring shall conform to the following gradation requirements w hen tested in accordance with Arizona Test Method 201: Sieve Size Percent Passing No. 4 100 No. 16 30 - 80 No. 50 0 - 30 No. 100 0 - 25 No. 200 0 - 20.0
All piping and 24- volt wire shall be installed as detailed on the project plans and shall have the minimum cover shown. Gravel sumps, as detailed on the project plans, shall be crushed coarse aggregate Number 57 conforming to the requirements of AASHTO M 43. 808- 3.05 Components: Components shall be as required by the details shown on the plans, in the project Special Provisions, as specified herein, and as directed by the Engineer.
The backflow prevention unit shall be installed with necessary supports as required by the project documents. The piping, as detailed shal l not be considered as adequate support. Shop drawings shall be provided by the contractor in accordance with the requirements of Subsection
105.03of the specifications. The supports shall receive protective paint
finish as specified in Sections 610 and 1002 of the specifications. Final finish shall be as specified by the Engineer. All exposed piping and unit bodies used in conjunction with the backflow preventer and the backflow preventer shall receive a protective covering of insulation as specified. TABLE OF CONTENTS INDEX 995 Access to all drains, vents, operators, unions or reliefs shall be maintained and the insulation shall not restrict their operation. The backflow prevention units shall be tested in accordance with the requirements as specified in the Manual of Cross- Connection Control Recommended Practice, as published by the Foundation for Cross-Connection Control Research, University of Southern California. Testing of backflow prevention unit shall be performed by the authorized service- test personnel. Test reports shal l be recorded on forms provided by the Engineer. No separate payment will be made for testing. Testing of backflow prevention units by authorized service -test personnel shall be performed before acceptance of both the construction phase and landscape establishment phase. In addition, testing shall be performed following any repairs or servicing of units. All backflow prevention devices shall be in place, tested and approved for use by the Engineer prior to the contractor using water from any potable water system. All testing shall be with available water pressure from the approved points- of-connection (P.O.C.), unless otherwise directed by the Engineer. Bench testing remote from the designated location of the unit will be u nacceptable.
Gate valves shall be the size(s) as indicated in the project documents. Gate valve size shall be equal to the larger adjacent pipe size as indicated on the project plans. All gate valves installed beyond structure lines shall be installed within specified valve boxes. No valves shall be placed beneath structures, sidewalks, roadway surfaces or within structural walls or columns unless shown on project plans and approved by the Engineer. Concrete support blocks for mainline gate valves shall be the type and size indicated on the project plans. Support blocks shall be installed under the gate valve body and shall not contact or support the adjacent pipe and fittings. Support blocks shall be placed on undisturbed soil or soil which has been compacted as specified in Subsection 203 - 5.03(B)(4) of the specifications. No separate payment will be made for the support block. Gate valves installed in valve boxes or enclosures below grade shall be exposed in entirety within the valve box. Extensions shall be added to valve boxes as necessary to prevent the surrounding soil or gravel sump from encroaching on the valve body and associated piping or fittings. TABLE OF CONTENTS INDEX 996
Quick coupling valves, the type and size as detailed on the project plans and as specified, shall be installed on the approved swing joint riser assembly. Additional pipe and/or nipples required to complete the swing joint assembly shall be PVC, Schedule 80; length shall be as required. Quick coupling valves shall be anchored to prevent movement as detailed on the project plans.
Remote control valves shall be installed as detailed on the project plans. Size of valves shall be as shown on the plans or as specified in other project documents. Unless otherwise detailed or specified, all remote control valves for use on irrigation systems shall be preceded by a gate valve. The gate valve shall be the size detailed or sized to the larger of either the control valve or the adjacent pipe. Remote control valves, accompanying gate valves and other required appurtenances shall be completely exposed and accessible within the valve box. Valve box extension shall be added as necessary to provide valve access and inspection/maintenance.
Automatic controllers (or field satellite) shall be installed as detailed and specified in the project documents, as recommended by the manufacturer and as approved by the Engineer. Controller enclosures shall remain closed and locked throughout the project duration except when actual work is in progress on the respective unit. Any finish or enclosure component damaged during transport or installation shall be repaired or replaced as directed by the manufacturer and approved by the Engineer. Remote control valve wire (ground and control) shall terminate within the automatic controller cabinet at a manufacturer supplied terminal strip. All connections shall be labeled as to function and/or valve number as approved by the Engineer. Incoming electrical supply circuit(s) shall be separated from the low voltage (24- volt) circuits by approved conduits or separator panels as approved by NEC and prevailing local codes. TABLE OF CONTENTS INDEX 997
Remote control wire (24- volt) shall be installed as specified by the project documents and Standard Specifications. Control wires to be installed throughout pipe sleeves shall be encased in PVC electrical conduit of appropriate size to contain the required number of conductors as determined by standard conduit sizing tables. Conduits shall extend 1 foot beyond each end of the sleeve unless otherwise noted. Wire connections at remote control valves and at field splices shall be made with specified wire connectors installed as recommended by the manufacturer. No field splices of 24- volt wiring shall be made unless the length between connections or splices exceeds 2,500 feet. Necessary splices shall be made at remote control valve boxes or separate splice boxes. Control and ground wire throughout the project shall be neatly bundled and taped with plastic electrical tape at 10- foot intervals between splices and/or connections and as directed by the Engineer.
The number of emitters per riser circuit, as shown on the project plans, is approximate. The contractor shall add no more than five additional single outlet emitters or one multi -outlet emitter per circuit, as detailed. Any additional emitters required and exceeding the above indicated amount must be approved by the Department. The contractor shall assume full responsibility for the correct installation of the emitter system, as herein specified, and unless it can show past experience of installing this type of system, it shall arrange with the manufacturer for the services of a qualified manufacturer's representative to be on hand at the start of the installation and as necessary during the installation and testing of the system. The contractor shall use the appropriate installation tools as recommended by the respective manufacturers for correct installation of emitters and emitter tubing.
All exposed pipe, fittings and unit bodies used in conjunction with the backflow preventers, fertilizer injectors and filter units as well as all exposed piping and valves at the water storage facilities and pumping facilities shall receive a protective covering of insulation. Access to all drains, vents, operators, unions or relief’s shall be maintained and shall not be restricted in their operation by the insulation. TABLE OF CONTENTS INDEX 998 Insulation shall be installed in a workmanlike manner with no voids or openings which will deter from the effectiveness of the insulation. The contractor shall assume full respon sibility for the correct installation of the insulation and shall arrange with the manufacturer for the services of a qualified manufacturer's representative to be on hand at the start of the insulation installation and as necessary during installation to assure proper application of all insulation materials. 808- 3.06 Testing Prior to Backfilling: The contractor shall furnish a sufficient number of pressure gauges with "tire chucks" which shall be uti lized in the testing and necessary adjustment of the water distribution system during construction and landscaping establishment. At the completion of the landscaping establishment period, the contractor shall del iver two pressure gauges and two tire chucks to the Engineer. All enclosures shall remain closed and locked and all valve box covers shall be in place throughout the construction and landscaping establishment periods except when actual work is in progress on the respective unit. When tests have been completed and any necessary repairs have been completed and accepted, trenches shall be backfilled. Pipe lines shall be normalized by water cooling the system just prior to beginning backfilling operations. The irrigation laterals shall be thoroughly flushed following assembly and backfilling of the trench. All laterals shall receive an additional flushing prior to installation of the irrigation heads. Additional flushing of the water distribution system may be required by the Engineer to assure proper function of the system including irrigation system devices. The contractor shall operate the irrigation system automatically for a minimum of five days prior to final acceptance of the construction phase and for the duration of landscape establishment phase. The contractor may operate the system manually, in addition to the automatic mode and as necessary during landscape establishment phase, as approved and directed by the Engineer. Any mechanical failure or leak that occurs during the establishment period shall be repaired or the defective materials shall be removed and replaced as directed by the Engineer. The system shall be retested as herein specified. TABLE OF CONTENTS INDEX 999 808- 3.07 Water Distribution System: The specifications for installing a water distribution system will be provided in the Special Provisions.
808-3.08Landscape Irrigation System:
The specifications for installing a landscape irrigation system will be provided in the Special Provisions. 808- 3.09 Water Distribution System Testing: Following completion of the installation of mains, control valves, gate valves and other components, and after all solvent -welded joints have cured for 24 hours, the water distribution system and/or landscape irrigation system shall be tested in accordance with the requirements of the Specifications and as approved by the Engineer. Under no circumstances will air pressure be acceptable for testing. The contractor shall flush and bleed all lines prior to testing. Metal or plastic caps shall be used to facilitate flushing and testing. Backfill material placed on the lines shall be limited to the quantity required to stabilize the lines under pressure and to serve as insulation during testing procedures. During testing, all fittings and couplings shall be visible for inspection. Any failures evident during the test shall be repaired and the system retested before backfilling. The contractor shall furnish the necessary equipment required to perform t he piping tests. No additional payment will be made for materials required to perform tests. Any mechanical failures or leaks which develop during testing shall be repaired or the defective materials shall be removed and replaced. After replacements or r epairs have been made, the entire testing procedures shall be repeated until it is determined that there are no leaks or failures in the irrigation system. Unless otherwise specified in the Special Provisions, the pressure mains and sub- mains shall be subj ected to a static pressure test of 100 pounds per square inch gage for a minimum period of two hours. During this time all solvent -welded and threaded connections and component parts shall be inspected to determine that no leaks exist. After installation of emitter laterals and supply tubing, but before installation of emitters, the emitter laterals and supply tubing shall be subjected to one hour of pressure testing, (pounds per square inch gage) at maximum lateral operating pressure unless otherwise directed by the Engineer, during which time components shall be inspected for leakage. All valves shall be tested in sequence, starting at the valve most remote from the source of water supply, to subject the mainlines to surge TABLE OF CONTENTS INDEX