121 SECTION 213 DESCRIPTION
213.01.01 General. This work consists of furnishing and installing irrigation systems.
213.01.02 Submittals. Within 30 days after award of contract, submit 3 sets of three ring binders, with
brochures or shop drawings for each accessory or fixture, and clearly identify each item of hardware or equipment to be installed, before ordering. The submittal shall include the manufacturer installation instructions for all equipment and materials used with pertinent dimensions , finish, proper placement, operation, maintenance data, and MSDS. If approved, one stamped three ring binder will be returned to the Contractor. Do not install equipment or materials until given approval. MATERIALS
213.02.01 General. Material shall conform to the following Section:
Roadside Materials .................................................................................................................................................................. Section 726 Portland cement concrete shall be Class A or Class AA unless otherwise provided, and shall conform to Section 501.
213.02.02 Bedding and Backfilling. Backfill polyvinyl chloride (PVC) pipe to be used as conduit for future
irrigation systems with native soil backfill which has been screened to remove rocks that are 12 .5 mm (1/2 in.) o r larger. Bed and backfill PVC pipe supply lines as shown on the plans. Material for sand bedding of pipe supply lines shall conform to the sieve size requirements for fine aggregate specified in Subsection 706.03.03.
213.02.03 Automatic Controllers. Controllers shall be coordinated to tie into Department adopted central
irrigation control system located at District headquarters or function as stand alone systems compatible with Department adopted central irrigation control system. Controllers shall be an electrically timed device for automatically opening and closing control valves for predetermined periods of time and mounted so that all normal adjustments will be conveniently located for use by the operator. The controller shall be programmable for irrigation schedule including the time of day, the number of watering times per week, and the length of time each valve operates. When called for on the plans, controller installation shall include sensors to detect changes in soil, wind, and precipitation conditions. Enclose controllers in a weatherproof steel housing with hasp and lock or locking device. Master key locks or locking devices and provide 3 sets of keys. Equip the controller to adjustably operate each valve in the circuit for setting to remain open for any desired period of time from 1 minute to 4 hours to provide adequate watering within an approved water window. The controllers shall require a communication link for connection to a central control computer. Equip the controller to operate on 110 - 117 V and with a circuit breaker or fusible connection to protect the controller from overloads. Provide the controller with a master on-off switch to turn all stations off without disturbing the clock settings or automatic timing sequences. Provide controls to allow any position to be operated manually both on and off whenever desired. Provide controls for resetting the start of the irrigation cycle at any time and advancing from one position to another. Irrigation control conductors shall be copper, UL approved, type UF direct burial cable of the gage indicated in the contract documents. Make splices in direct burial cable with a UL approved kit for that purpose and install in a traffic rated valve box. 213 IRRIGATION SYSTEMS 122 The controller shall have a solid stat e design and have random access of all stations. The controller shall have a built -in output surge protection and lightning protection grounding. Automatic controller units shall be pre -assembled by the manufactur er’s representative and include groundi ng, wiring, footing , and other appurtenances to construct a complete operable assembly . Installation of the controller systems shall include a flow meter assembly and a 14 gauge wire between the flow meter and controllers in a 25 mm ( 1 in.) electrical pol yvinyl chloride conduit placed in same trench as the mainline. The controller shall have the ability to upgrade to radio remote capability up to a distance of 610 m ( 2,000 ft ). Units to have programming password and stainless steel lock securing weather resistant exterior panel.
213.02.04 Booster Pump. Use electric powered pump to meet system needs of volume and pressure for
irrigation valve with the highest flow and pressure demand and as indicated on plans. Discharge pressures in kPa (psi) and flows in liters per minute ( gallons per minute) min imum and max imum shall be met before installation occurs. Pump shall have an e -coat cast iron casing, motor adapter, stay bolts, stainless steel impellers and pump shaft. Pump shall be placed in locking vandal resistant enclosure. Power shall be single or triple phase and minimum 60 Hz. Pump shall include all necessary equipment per manufacturer.
213.02.05 Thrust Blocks. Construct thrust blocks of the size and at the locations shown . Place thrust blocks
against undisturbed soil. Wrap pipe and fittings which contact thrust block with 200 µm (8 mil ) minimum thickness polyethylene wrap as a bond breaker. Use No. 13 (# 4) reinforcing steel conforming to Section 505 for joint restraints around pipe and anchor in thrust blocks .
213.02.06 Sprinkler Heads. Supply sprinkler heads of the type, pattern , and coverage shown on the plans.
Sprinkler heads shall be placed to provide head to head coverage and shall have matched precipitation rate nozzles unless otherwise specified.
213.02.07 Drip Emitter Assembly. Drip emitters shall be pressure compensating, self -flushing, and have 1
or 2 gallon per hour flow rate at 140 kPa ( 20 psi ) minimum to 210 kPa ( 30 psi ) maximum, with a barbed connector. The flow rate shall be independent of temperature as to sun or shade, night or day. Use rigid schedule 40 PVC pipe for supply (lateral) lines to center of drip area limits and polyethylene drip tubing to the emitter. The emitter assembly shall include drip em itters, a barb by barb connector , and 6 mm (1/4 in.) drip distribution tubing.
213.02.08 Valve Protection Sleeves. Use precast reinforced Portland cement concrete sleeve valve
protectors with a cast -iron lid of the dimensions shown. Extend valve protectors as necessary to reach the depth indicated. Make extensions of the same materials as the valve protectors. Valve protectors and extensions may be the product of commercial producers upon prior approval. In lieu of the concrete valve protectors, fiberglass or plastic valve protectors may be installed, providing they meet the requirements of ASTM D256, D638, D648, and D790.
213.02.09 Gate Valves. Valves 2 1/2-NPS and smaller shall be of the same size as the pipes on which they
are placed unless ot herwise indicated on the plans. Service rating for non -shock cold water shall be 1,380 kPa (200 psi). These valves shall be all bronze, with rising stem and union bonnet. Provide valves with a gland to compress packing, and with back seating to permit repa cking the valve under full pressure when it is wide open. Valves shall have cross type handles of brass. Thread and install valves 2 1/2-NPS and smaller with one union on either side of the valve. Gate valves 3 -NPS and larger, shall be iron body, bronze m ounted, double disc, parallel seat type with “O” ring seal , and shall comply with AWWA Standards. These valves shall have a working pressure of 1,380 kPa (200 psi) and a test pressure of 2,760 kPa (400 psi). Furnish a shut -off rod, 1.8 m (6 ft) in length t hat will fit a 50 mm (2 in.) wrench nut. Do not mount gate valves on swing joints. IRRIGATION SYSTEMS 213 123 213.02.10 Control Valves. Manual control valves shall be straight or angle pattern globe valves of all brass or bronze construction with replaceable compression disks. Co ntrol valves shall be of the same size as the pipes on which they are placed unless otherwise indicated on the plans, and provide with a union connection. Provide manual control valves capable of withstanding a cold water working pressure of 1,030 kPa (150 psi). Master electric control valves shall be of the diaphragm type, normally open, 24V, 60 cycle. Electric control valves shall be of the diaphragm type, normally closed, 24 V, 60 cycle. The valve solenoids shall operate with 18 to 30 V of power. Comp letely encapsulate the solenoid for positive waterproofing. Provide the valve body and bonnet of cast brass or bronze, flange or threaded type. Provide threaded type with a union connection. The time interval between opening and closing the valve shall not be less than 5 seconds. Spring load the solenoid plunger so the valve may operate when installed in any position. Construct the solenoid plunger of stainless steel with a neoprene seat. Provide valve bonnet with a bleed screw for manual operation and a manual flow control adjustment. Electric control valves shall be capable of withstanding a non -shock cold water working pressure of 1,030 kPa (150 psi). The drip irrigation control unit shall consist of a 1 -NPS, bronze or brass construction valve and pressure regulating device to reduce water pressure to the level for which drip emitters are rated. The pressure regulating device shall have an adjustable re duced pressure range of 100 kPa ( 15 psi) to 1030 kPa ( 150 psi ) flow pressure, an integral strainer unit, and a pressure gauge with a range of zero to 690 kPa ( 100 psi ) and the necessary fittings to conform to the diagrams shown on the plans. The assembly s hall also include a basket filter with stainless steel screen. For areas with clay soil use 200 mesh stainless steel screen and for areas with sand soils use 100 mesh screen. Filters shall be capable of withstanding a cold water working pressure of 1030 kP a (150 psi ).
213.02.11 Quick Coupler Valves. The quick coupler valve shall be of brass or bronze, 2 piece construction
with removable upper body. Design the valve body with a single slot to receive a single slot coupler. The top shall have a locking rubb er cover. Provide three each cover key and valve keys with hose swivels.
213.02.12 Valve Boxes. Use reinforced precast Portland cement concrete valve boxes with a steel lid. Size
valve boxes to provide 150 mm (6 in.) minimum clearance around entire equip ment assembly. Provide Portland cement concrete footing under valve box as shown on Standard Plan Sheet T-30.1.18 . Provide valve boxes with extensions as necessary to reach the depth indicated. Extensions shall be of the same material as the valve box. In lieu of concrete valve boxes, fiberglass or plastic valve boxes may be installed providing they meet the requirements of ASTM D256, D638, D648, and D790. Use gravel in valve box installations conforming to Subsection 704.03.01 for Type 2. Etch valve b ox lids , as well as on the interior recessed portion of the lid flange , with initials as appropriate for the box contents as shown below. Letter and number size shall be 25 to 100 mm ( 1 to 4 in.). Box Contents Initials Shut off valve ................................ ................................ .............. S.V. Remote cont rol sprinkler valves ................................ ........ S / controller letter / station number Remote control drip valves ................................ ............ D / controller letter / station number Quick coupling valves ................................ ................................ ........ Q.C. Wire splices ................................ ................................ ............... W.S. Drain valve ................................ ................................ ................ D.V. Air relief valve ................................ ................................ ............. A.R.V. Isolation valves (gate valves) ................................ ................................ ... I.V. Master control valve ................................ ................................ ....... M.C.V. Flow sensor ................................ ................................ ............... F.S. Drip lateral flush plug ................................ ................. F.P / control letter / station number
213.02.13 Irrigation Control Wiring. Control wire shall be 14 gauge minimum for control, 12 gauge minimum
for common wire. Wire gauge shall be adjusted per manufacturer’s specifications for distance from controller to component. Use direct burial wire. Common wire shall be white.
213.02.14 Chemigation Manifold. Supply three 1/4 -turn valves on outlet side of reduced pressure a ssembly
between brass tee with plug and brass union. See reduced p ressure assembly (RPA) detail. Size valves as shown on the plans. 213 IRRIGATION SYSTEMS 124 213.02.15 Drain Valves. Construct automatic ball check valves of 12.5 mm (1/2 in.) threaded plastic with a closing pressure of 69 to 76 kPa (10 to 11 psi) and an opening pressure of 62 to 69 kPa (9 to 10 psi). The valve shall have a maximum working pressure of 6.9 MPa (1,000 psi) and a minimum bursting pressure of 17.2 MPa (2,500 psi). Install valves with a washed gravel sum p as shown on the plans. Use gravel conforming to the requirements for Size No.7 in Subsection 706.03.01. Manual drains shall be bronze gate valves as shown on plans with cross top handle.
213.02.16 Air Relief Valve. Design the air relief valve to releas e air entrapped in a pipeline until liquid
reaches the float which will rise to the seat and close the valve. The float shall be stainless steel resting within a stainless steel or bronze cup. The valve body and flange shall be brass/bronze construction. T he valve shall be 1-NPS size with screwed inlet, and shall be capable of withstanding press ures up to 2,070 kPa (300 psi).
213.02.17 Backflow Preventers. Use reduced pressure principle type backflow preventers as required by the
water purveyor. Backflow preventer assemblies shall withstand a maximum operating pressure of 1,200 kPa (175 psi) and shall include the backflow preventer and appropriate valves on each end . Valves 2 1/2-NPS and larger shall be flanged type, iron body, brass trimmed, resilient we dge with non -rising stem. Valves smaller than 2 1/2-NPS shall be full port resilient seated ball valves. Provide the backflow preventer assemblies of the size shown on the plans. Provide backflow preventer assemblies smaller than 2 1/2-NPS with a union on each end of assembly. Upon completion of installation, and before being put into service, have the backflow preventers tested by the water purveyor or a certified tester who was certified within the last 3 years by the AWWA. The testing equipment shall have been certified within the past 12 months. Test the backflow preventers again at the end of the one year plant establishment period. Provide proof of current certification for both the tester and testing equipment. Provide a written report of the test r esults. Perform the tests according to the provisions of the Manual of Cross -Connection Control. The testing equipment shall have all necessary hoses and fittings and be equipped with a differential pressure gauge that has a differential range of at least zero to 100 kPa (15 psi) and graduations of not more than 1.5 kPa (0.2 psi). Make necessary repairs only with the backflow preventer manufacturer approved parts. The backflow preventer assembly shall also meet the requirements of the Water Purveyor, the American Society of Sanitary Engineers (ASSE), and the AWWA. The backflow preventer shall be furnished with a c over that is pre-manufactured of marine grade aluminum alloy 5052 -H32 conforming to ASTM B209 with a minimum wall thickness of 3 mm (0.125 in.) . The main housing shall be of a solid sheet with a minimum R -6 rigid sheet insulation on the top and sides. Install a flexible rubber insert formed in a loop to provide dead air space along the bottom. The backflow preventer cover shall be vandal and weat her resistant. The length of the cover shall be expandable to allow for site adjustment and shall be a center split design having mounting lips on each side. Submerge the mounting base into the concrete a minimum of 50 mm (2 in.), and position the cover 3 8 mm (1.5 in .) above the concrete for drainage purposes. The locking mechanism shall be flush mounted of the full release type which allows for complete removal of the cover from its mounting base without use of tools. Conceal the handle controlling the loc king mechanism within the surface of the enclosure and provide padlock system. Take care to insure that the cover can be properly opened in all directions. Manufacturers of backflow preventer covers are listed in the QPL. CONSTRUCTION
213.03.01 General. The irrigation system as shown on the plans is diagrammatic and may require
modification so as to provide complete and adequate coverage of the areas to be irrigated. Do not willfully install the irrigation system as shown when it is obvious in the field that obstructions or differences in dimensions exist from that shown on the plans. Give immediate notification of obstructions or defic iencies. IRRIGATION SYSTEMS 213 125 Do not alter or change the location of pipes, valves, sprinklers, or other equipment as shown on the plans unles s so authorized. Make necessary arrangements for connecting to mains with the agency supplying the water, with such installations and equipment conforming to the requirements set forth by the supplying agency. The point of connection shall be as indicated on the plans. Submit written documentation of available flow and pressure downstream from the point -of-connection after the meter prior to system installation. Give notification immediately if available flow and pressure is less than required to operate the system as designed. Do not begin installation of the system until necessary design revisions have been made . Irrigation components shown within paved areas shall be installed in planting areas whenever possib le. Provide equipment and parts not specifically noted but reasonably inferred fro m the plans and specifications. Coordinate installation of irrigation components to avoid conflict with other trades and for placement of pipe, wiring, conduit , and irrigati on components. Stake out the location of each run of pipe and valve locations before trenching. Components shall be adjusted to provide adequate water for thriving growth of plant material with minimal over spray of water onto adjacent surfaces. Maintain the operation of existing irrigation systems to areas adjacent to the project site during construction with uninterrupted water service. Provide an installation schedule to allow the Department or water purveyor to inspect all aspects of irrigatio n installation. Uncover, expose, or retest elements installed without prior notification.
213.03.02 Excavation. Make trenches of sufficient width to permit placing of pipe. Do not snake pipe
connected with rubber ring -type fittings. Keep the top 150 mm ( 6 in.) of top soil, when such exists, separate from subsoil and replace as the top layer when backfill is made. Excavate trenches in rock or like material 50 mm (2 in.) below the required depth and backfill to the required depth with sand or other suitab le ma terial free from rock or stones . Exercise care when excavating trenches near existing trees. Where roots are 50 mm (2 in.) and greater in diameter, except in the direct path of the pipe, hand excavate and tunnel the pipe trench. Wrap large exposed roots with heavy burlap or canvas for protection and to prevent excessive drying. In trenches dug by machines adjacent to trees having roots 50 mm (2 in.) and less in diameter, hand trim sides making a clean cut of the roots. Backfill trenches having expos ed tree roots within 24 hours unless adequately protected by moist burlap or canvas. Keep burlap or canvas moist until trench is backfilled. Remove burlap or canvas immediately prior to backfilling trench.
213.03.0 3 Piping . Install live main lines a mini mum of 900 mm (36 in.) below finished grade, measured from
the top of the pipe. Install lateral PVC secondary supply lines a minimum of 450 mm (18 in.) and drip lateral and distribution lines a minimum of 150 mm (6 in.) below finished grade, measured from the top of the pipe. Provide 75 mm ( 3 in.) clear to pipe, connections , and fittings. Provide water lines installed less than 900 mm (36 in.) below finished grade, except drip lines, a means for drainage to prevent freezing. Slope pipes to drain without sa gs. Unless otherwise specified, place drain valves only at the low point of all lateral PVC or main lines. Place live mains and wiring located under pavement in separate PVC sleeves, placed adjacent and parallel. Sleeves shall be sized 50 mm ( 2 in.) in diameter larger than the size of the pipe to be extended thru the sleeve and shall be made of Schedule 40 PVC pipe, unless noted otherwise on the plans. Add extra sleeves as shown on plans. Extend sleeves a minimum of 0.6 m ( 2 ft) beyond the edge of the pav ed surface, cap sleeves and mark surface with location marker for future access. Spray paint location marker with orange paint. Sleeves for drip tubing shall be installed 200 mm ( 8 in.) below finished paved surfaces. Bore under existing to place sleeves, unless otherwise noted on the plans. Perform boring operations in an approved manner and run conduit at a depth below the pavement as specified. Lines and wiring shall be installed under paving in separate conduit. Where possible, place mains, laterals , and drip lines in the same trench. 213 IRRIGATION SYSTEMS 126 For contracts located in some areas of southern Nevada, the minimum required depth for the installation of live main lines of 900 mm (36 in.) below finished grade and the requirement to provide a means of drainage of water lines installed less than 900 mm (36 in.) below finished grade, as stated above, may be reduced to 600 mm (24 in.) when approved in writing. Make requests for approval, in writing, according to Subsection 102.05.
213.03.0 4 Jointing. Install galvanized st eel pipe with sound, clean cut well fitted standard pipe threads. Well
ream pipe to the full diameter and remove burrs before assembly. Smoothly and evenly apply joint compound to the male thread only on threaded joints. Use joint compounds listed in the Q PL. Make screwed joints tight with tongs and wrenches without the use of handle extensions. Clean and remake joints that leak with new material. Do not caulk or use thread cement to make joints tight.
213.03.05 Installation . Install conduit not less than 450 mm (1.5 ft) below the curb grade in sidewalk areas
and not less than 1,070 mm (3.5 ft) below the finished grade in all other areas. Install conduit under existing pavement by approved boring or drilling methods. Do not disturb pavement without approval , and only in the event obstructions are encountered. When permitted, small test holes may be cut in the pavement to locate obstructions. Keep boring or drilling pits at least 600 mm (2 ft) from pavement edge wherever possible. Do not excessively use water that will soften sub -grade or undermine the pavement. Excavation shall conform to the construction provisions in Section 206. Backfill shall conform to Section 207 , except backfill materials shall not exceed 12.5 mm ( 1/2 in .) in largest dimension. Grade and prepare the bottom of the trench to provide a firm and uniform bearing throughout the entire length of the conduit. During backfilling operations, rigidly support the conduit so that no movement of or damage to the conduit or joints will result. Where connection is made to existing supply lines, compression type fittings may be used with approval. Install a backflow preventer at each meter if called for on the plans. Where supply lines or conduits are to be installed through existing paved area s, remove the sub base, base, and paving and replace with material of equal quality. Cut pipe straight and true. After cutting, ream out the ends to the full inside diameter of the pipe. Place irrigation main lines from meter to manual drain after back flow preventer assembly in a trench of 150 mm (6 in.) minimum width and lay on a 50 mm (2 in.) layer of sand bedding as shown on the plans. Snake irrigation pipe from side to side in the trench at approximately 7.5 m (25 ft) intervals. Partially backfill P VC pipe between joints with smaller amounts of backfill material to prevent movement during the pressure test. Threaded pipe components shall be joined with four turns of PTFE (thread seal) tape. Install and lay drip tubing according to the manufacturer’s recommendations. Use barb connectors to connect tubing together. Construct drip emitter assembly as shown on the plans. Install emitters directly uphill of plant when planting on slopes. Fit the stub ends of drip tubing with an approved flushing end plug which will facilitate future draining or flushing. Prevent foreign material from entering the irrigation system during installation. Immediately before assembling, clean pipes, valves, and fittings. Plug or cap unattached ends of pipe, fittings, and valv es pending attachment of additional pipe or fittings. Thoroughly flush lines out before attachment of terminal fittings. Install sprinkler connections on swing joints or swing piping as detailed on the plans. Locate automatic drain valves at system low points a minimum of one valve per lateral. Locate manual drain valves in main line at all low points a minimum of 1 per 30 linear meters (1 00 linear feet ). Install and lay PVC irrigation pipe according to the manufacturer’s instructions. Before joints of PVC plastic pipe are made up, expose the plastic pipe fittings to the same temperature for a reasonable length of time. Cut pipe with a fine -tooth hacksaw or PVC cutters and remove burrs. Clean and soften the outside surface of the pipe and the inside surf ace of the fittings with an approved primer, using a dauber, brush top applicator, or paint brush about half the pipe diameter. Apply a light second coat of primer to the fitting socket. Do not allow primer to run down the inside of the pipe. IRRIGATION SYSTEMS 213 127 Using an ap proved cement , apply the cement solution to the pipe and fitting socket with an applicator having a width of approximately half the diameter of the pipe, using the proper cement for the size of pipe. Apply a full, even layer of cement on the pipe, equal to the depth of socket. Flow the cement on with the applicator, do not brush it out to a thin paint type layer. Apply a medium layer of cement to the fitting socket, avoid puddling cement in the socket. On bell end pipe, do not coat beyond the socket depth o r allow cement to run down in the pipe beyond the bell. Apply a second full even layer of cement on the pipe. Assemble the pipe and fitting without delay, making certain cement is wet. Use sufficient force to ensure that the pipe bottoms in the fitting soc ket. Twist the pipe 1/8 to 1/4 turn as it is inserted. Hold the fitting and the pipe together until cement takes its initial set. After assembly , the joint shall have a ring or bead of cement completely around the junction of the pipe and fitting. If voids in this ring are present, it indicates sufficient cement was not applied and the joint will be considered defective. Using a rag, remove the excess cement from the pipe and fitting including the ring or bead. Avoid disturbing or moving the joint. Handle n ewly assembled joints carefully until initial set has taken place. The setting time allowed before handling or moving is related to temperature, type of cement, and size of pipe, and shall be according to manufacturer’s recommendations. Do n ot use old or t hickened cement. Thrust blocks shall be provided at each valve, bend, tee, plug, dead end, and at reducers or fittings where changes occur in pipe diameter or direction. Pour thrust block so access to flanges and bolts is not obstructed.
213.03.06 Copper Installation. Threaded pipe connections shall be installed with 3 to 4 wraps of PTFE
(thread seal) tape. Slip pipe connections are to be soldered. Clean pipe ends with a scratch cloth or steel wool until both sides of the couplings and pipe are shiny clean, apply flux, join , and solder.
213.03.07 Drip Irrigation. Drip irrigation zones shall be a maximum length of 60 m ( 200 f t) for 12.5 mm
(1/2 in.) drip irrigation line and 120 m ( 400 ft ) for 19 mm (3/4 in.) drip irrigation line, each being controlled by a separate valve . See details for drip valve/pressure reducer/filter configuration. The general distribution of drip irrigation water shall occur through PVC laterals . Shrub and tree plantings shall be provided with drip irrigation. Where multiple emitt ers are indicated in the schedule, place at equ al locations around each plant.
213.03.08 Flow Sensor. See Point of Connection Detail for installation sequence. Sensors shall be sized for
flow rather than pipe size. Install flow sensor and controller conne ction according to manufacturer’s recommendations and as shown on the plans.
213.03.09 Irrigation Control Wiring. Control wire shall be placed loosely beneath pipes in the trench and
taped at 4.5 m ( 15 ft) intervals. Provide pull box or junction box at locations where wire is spliced and at controller. Place one extra length of wire with the wires in the longest electrical circuit.
213.03.10 Flushing and Testing . Flush supply lines completely of foreign particles before placing section
control valves, q uick-coupler valves , and hose bibs. After flushing and when valves are in place, test supply lines at the maximum available pressure with valves closed. Maintain pressure for a period of not less than 4 consecutive hours. Clean, remake, and retest joints s howing leaks. After inspection and before backfilling, run water through the entire line until the pipe has been cooled to the lowest temperature, then immediately backfill the trench in a manner that no damage or disturbance is caused to the pipe. After installation of section lines, completely flush the piping of foreign particles before attaching sprinkler heads and drain valves. After flushing, test section lines with risers capped and drain valves closed. Make the test at maximum operating pressure f or a period of one hour. Clean, remake, and retest joints showing leaks. Test control tubing in the manner specified for main supply lines. Flush tubing for 5 minutes before conn ection with the control valves. Test automatic controllers by actual operati on for 2 weeks under normal operating conditions. Should adjustments be required, do so according to manufacturer’s direction and test u ntil operation is satisfactory. Test booster pump with the casing full of water and primed. Pump shall be placed along the pressurized mainline and after the reduced pressure assembly unless otherwise noted on plans and details. 213 IRRIGATION SYSTEMS 128 213.03.1 1 Backfill. Do not start backfilling until all piping has been inspected, tested, and approved. Complete backfilling as soon as possibl e. In trenches , place native soil, free from rock or stones larger than 12 .5 mm (1/2 in.) in diameter. Place backfill from the bottom of the trench to approximately 150 mm (6 in.) above the pipe by continuous tamping in such a manner that will not damage pipe and proceed evenly on both sides of the pipe. Thoroughly tamp the remain der of the backfill. Do not use heavy equipment within 450 mm (18 in.) of pipe. Use backfill material free of rocks, roots, or other objectionable material. Construct the top 150 mm (6 in.) of the backfill of top soil material or the first 150 mm (6 in.) o f material removed in the excavation.
213.03.1 2 Adjusting System . Before final inspection, adjust and balance sprinklers to provide adequate and
uniform coverage. Balance spray patterns by adjusting individual sprinkler heads with the adjustment screws or replacing nozzles to produce a uniform pattern. Unless otherwise specified, prevent sprinkler spray patterns on pavement, walks, or structures. METHOD OF MEASUREMENT
213.04.0 1 Measurement . The materials to be measured for payment will be listed in the contract items by
size, class, type, thickness, or whatever information is necessary for identification. Pipe and tubing will be measured by the linear meter (linear foot). Pip e bends, wyes, tees, and other branches will be measured as pipe along center lines to the point of intersection. Automatic controller s, booster pump s, chemigation manifold s, quick couplers, valve boxes, flow sensor s, backflow preventer s, backflow prevent er covers, valve assemblies, riser assemblies , and drip emitter assemblies will be measured by the each. Backflow preventer assemblies shall include the backflow preventer, pressure regulation device (per water purveyor requirements) , valves, drains, che migation inlets, unions , and fittings required for proper installation. BASIS OF PAYMENT
213.05.01 Payment . The accepted quantities, measured as specified above, will be paid for at the contract
price per unit of measurement for the pay items listed belo w that are shown in the proposal. Payment will be full compensation for the work prescrib ed in this Section. Payment will be made under: Pay Item Pay Unit (size) (type) Pipe ................................ ................................ ................................ ................................ ............... Linear Meter (Linear Foot) (size) (type) (name of attachment) ................................ ................................ ................................ ................................ ..................... Each 129 SECTION 214 MAILBOX SYSTEMS DESCRIPTION
214.01.01 General. This work consists of furnishing and installing mailbox systems.
MATERIALS
214.02.01 General. Furnish mailboxes which are marked by U.S. Postal Service and equivalent to the sizes
removed (Standard or Large), including proper address labeling. The mailbox systems shall include the mailboxes and mailbox support systems. The mailbox support systems shall be either Type A, B, or C as shown in the plans. The Type C mailbox support shown on Standard Plan Sheet R-12.1.3 shall be from the manufacturers listed in the QPL. The mailbox support systems shall include all posts, brackets, hardware and any other incidentals required to install the completed systems. The required number of installations and types of mounts (single, double, and multiple) will be as indicated on the plans. Equip the mailbox support system posts with a strip of 75 mm x 200 mm (3 in. x 8 in.) white reflective sheeting facing oncoming traffic as shown on the plans. The reflective sheeting shall conform to Subsection 716.03.01 for Type IV, IX, or XI. CONSTRUCTION
214.03.01 General. Install the mailbox systems according to the details shown on the plans and per the
manufacturer’s recommendations. See Subsection 108.04 regarding limitations on the removal of existing and installation of mailboxes. Before installing mailbox systems, give the U.S. Postal Service a minimum of 5 working days written notification so they can arrange their schedule to have a representative present to coordinate the installation of the mailbox systems. METHOD OF MEASUREMENT
214.04.01 Measurement. Mailbox systems will be measured by the each. The each measurement will be by
the number of mailbox systems installed, regardless of the number, size and type of mailboxes attached thereto. BASIS OF PAYMENT
214.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit Mailbox System (Single) .................................................................................................................................................................... Each Mailbox System (Double) ................................................................................................................................................................... Each Mailbox System (Multiple) .................................................................................................................................................................. Each