20 LANDSCAPE
20-1 General
20-1.01 General
20-1.01A Summary
Section 20 includes general specifications for performing landscaping work . Perform roadside clearing:
1.As required to prepare the job site for construction work
2.Until the start of the plant establishment work or Contract acceptance, whichever comes fir st Check for plant deficiencies under section 20 -10.03A(4) before installing any irrigation system in an existing planting area to be maintained. Unless a supply line is shown through plant holes, relocate any plant hole to clear a supply line. Do not install supply lines, control and neutral conductors, and electrical conduits in common trenches above each other.
20-1.01B Definitions
Reserved
20-1.01C Submittals
At least 15 days before applying any pesticide, submit a copy of the pest control adviser 's recommendation. At the end of each week, submit a Report of Chemical Spray Operations form as an informational submittal documenting the application of all pesticides. Before mixing a pesticide, submit a copy of the registered label for the pesticide as an informational submittal. If you are unable to copy the label, allow the Engineer to read the label on the container.
20-1.01D Quality Assurance
20-1.01D(1) General
Obtain a recommendation for the use of all pesticides under the Food & Agri Code from a pest control adviser who is licensed as an agricultural pest control adviser in the State. The recommendation must include the pesticides to be used, rates of application, methods of application, and application areas. The pesticide applicator must have an active and valid qualified applicator license or certificate from the Department of Pesticide Regulation.
20-1.01D(2) Progress Inspections
The Engineer performs progress inspection s:
1.After marking plant locations
2.Before cultivating work starts
3.Before pressure testing of irrigation pipe on the supply side of control valves
4.Before testing of low voltage control and neutral conductors
5.During irrigation system functional tests
6.Before planting the plants
7.Before completion of planting wor k
8.Before the start of plant establishment work
9.Once a month during the plant establishment period Notify the Engineer at least 4 business days before each inspection is required. Allow at least 3 business days for the Engineer's inspection. Do not p roceed with the next construction activity until the inspection has been completed and any required corrective work has been performed and authorized. SECTION 20 LANDSCAPE
20-1.01D(3) Reserved
20-1.02 Materials
20-1.02A General
Reserved
20-1.02B Water
Unless there is a bid item for irrigation water service charges, the Department furnishes water if it is available from an existing Department -owned facility within the project limits or an irrigat ion system to be installed under the Contract. If water is not available from one of these sources, make arrangements for supplying water. Water must be of a quality that promotes plant growth.
20-1.02C Pesticides
Pesticides must comply with the regulations of the Department of Pesticide Regulation . Insecticide must be imidacloprid. Rodenticides must be brodifacoum, bromadiolone, or diphacinone. Do not use pelleted forms of pesticides for weed control. For weed control, use a pesticide with a photosensitive dye that produces a contrasting color when sprayed on the ground. The color must disappear within 2 to 3 days after being applied. The dye must not stain surfaces or injure plants or wildlife when applied at the manufacturer's recommended application rate.
20-1.02D 20-1.02H Reserved
20-1.03 Construction
20-1.03A General
Take precautions to prevent irrigation water from:
1.Wetting vehicles, pedestrians, and pavement
2.Eroding soil
3.Causing excess run off If water use calculations are provided as supplemental project information, water plants under the Model Water Efficient Landscape Ordinance, 23 CA Code of Regs § 490 et seq., and local water agency provisions. Water plants at night unless otherwise a uthorized. Dispose of removed, pruned, and damaged vegetative material. You may reduce removed vegetative material to chips with a maximum thickness of 1/2 inch and spread it within the job site at locations determined by the Engineer. Do not substitute ch ipped material for wood mulch or place it in areas to receive wood mulch.
20-1.03B Pesticides
Notify the Engineer of pesticide application times at least 24 hours before each application. Mix and apply pesti cides under the regulations of the Department of Pesticide Regulation and the instructions on the pesticide product label. Do not apply pesticides:
1.On Saturdays and holidays unless authorized
2.Whenever weather and wind conditions are unsuitable for application
3.Within the plant basin
4.On the foliage and woody parts of the plant SECTION 20 LANDSCAPE Any granular preemergent must be covered with wood mulch or other inert ground cover materials on the same workday. Do not apply granular preemergent in pl ant basins. Do not apply preemergents:
1.To groundcover plants within 3 days after planting
2.Within 18 inches of trees, shrubs, and seeded areas
3.Before plants have been thoroughly watered
20-1.03C Roadside Clearing
20-1.03C(1) General
Roadside cle aring includes:
1.Removing existing plants described to be removed
2.Controlling weeds and pests Control rodents by using rodenticides or traps.
20-1.03C(2) Remove Existing Plants
Removal of existing plants includes removing their stumps and roots 2 inches or larger in diameter to a minimum depth of 12 inches below finished grade. Backfill holes resulting from stump removal to the finished grade with material obtained from adjacent areas. If a plant is to be planted within an existing groundcover area, remove the existing groundcover from within an area 6 feet in diameter centered at each plant location.
20-1.03C(3) Weed Control
Control weeds by the use of pesticides, hand -pulling, or mowing. If pesticides are used to control weeds, apply pesticides before the weeds reach the seed stage of growth or exceed 4 inches in length, whichever occurs first. Do not use pesticides at cutting plant locations. Where cuttings are to be planted, control wee ds by hand -pulling within an area 2 feet in diameter centered at each plant location . If weeds are to be controlled by hand -pulling, hand -pull weeds before they reach the seed stage of growth or exceed 4 inches in length, whichever occurs first. Where liner, plug, or seedling plants are to be planted 10 feet or more apart, control weeds by the use of pesticides or hand -pulling within an area 2 feet in diameter centered at each plant location. Where liner, plug, or seedling plants are to be planted less than 10 feet apart, control weeds by the use of pesticides within the entire area. Control weeds by mowing outside of mulched areas, plant basins, groundcover areas, and within areas to be seeded. Mowing must extend to the edges of pavement, dikes, curbs, sidewalks, walls, and fences. If mowing is to be performed within areas to be seeded, perform mowing as needed until the start of the seeding activity. Perform mowing before the weeds reach the seed stage of growth or exceed 6 inches in length, whichever o ccurs first. Mow weeds to a height of 3 inches.
20-1.03C(4) Disposal of Removed Groundcover, Weeds, and Mowed Material
Dispose of hand -pulled weeds the same day they are pulled. Dispose of removed groundcover within 3 days. Dispose of mowed material from the initial mowing. Disposal of material from subsequent mowing is not required. SECTION 20 LANDSCAPE
20-1.03D Cultivation
Cultivation must be by mechanical methods and performed until the soil is in a loose condition to a minimum depth of 6 inches. Soil clods must not be larger than 2 inches in maximum dimension after cultivation. The areas to be cultivated must extend 12 inches beyond the outer limit of each planting area requiring cultivation. After initial cultivation, plac e soil amendment and fertilizer at specified rates. Recultivate to thoroughly mix native soil and amendments. Do not drive on cultivated areas after cultivation. Planting areas that have been cultivated and become compacted must be recultivated. Rocks and debris encountered during soil preparation in planting areas must be brought to the ground surface. Remove rocks and debris as ordered. This work is change order work.
20-1.03E Weed Germination
Reserved
20-1.03F 20-1.03K Reserved
20-1.04 Payment
The payment quantity for landscape bid items paid for by the area is the area measured parallel to the ground surface. The payment quantity for cultivation includes the area not cultivated within the cul tivation area shown.
20-2 Irrigation
20-2.01 General
20-2.01A General
20-2.01A(1) Summary
Section 20 -2.01 includes general specifications for installing irrigation systems . The irrigation systems shown are diagrammatic.
20-2.01A(2) Definitions
Reserved
20-2.01A(3) Submittals
20-2.01A(3)(a) General
Submit shop drawings for the electrical components of the irrigation system ex cept electric service (irrigation) 30 days before installation. The drawings must:
1.Include schematic wiring diagrams showing wire sizes and routes between electrical components
2.Show conduit sizes
3.Bear the written approval of the controller manufac turer or the manufacturer's authorized agent
4.Be accompanied by: 4.1. Colored wire and splice samples 4.2. Manufacturer's descriptive and technical literature
20-2.01A(3)(b) Manufacturer's Instructions
Submit the manufacturer's installation instruction s as an informational submittal at least 15 days before installing:
1.Couplings for conduits used for irrigation conduits
2.Plastic pipe and fittings
3.Solvent cement for plastic pipe and flexible hose SECTION 20 LANDSCAPE
4.Sprinklers
5.Flow sensors
6.Rain sensors
7.Remote control valves
8.Backflow preventers
20-2.01A(4) Quality Assurance
20-2.01A(4)(a) General
Reserved
20-2.01A(4)(b) Pressure Testing
20-2.01A(4)(b)(i) General
Perform pressure testing for leakage on irrigation supply lines:
1.In the Engineer's presence
2.On business days from 8 a.m. to 5 p.m. unless authorized
3.Before backfilling supply line trenches
4.With irrigation system gate valves open
5.With open ends of the supply line and fittings plugged or capped Notify the Engineer at least 48 hours before performing a pressure test. Perform pressure testing using Method A or B to test supply lines installed by trenching and backfilling and supply lines that are completely visible after installation. Perform pressure testing using Method A to test all other supply lines, including those installed in the ground by meth ods other than trenching and backfilling. Test irrigation supply line in conduit by Method A with the testing period modified to 0.5 hour and no allowable pressure drop.
20-2.01A(4)(b)(ii) Method A
For Method A pressure testing for leakage:
1.Calibrate t he pressure gauge from 0 to 200 psi in 5 psi increments. Pressure gauge must be accurate to within a tolerance of 2 psi .
2.Fill the supply line with water and connect the line to a pressure gauge. Place the pipeline under a pressure of 125 psi. Remove the source of pressure and leave the line under the required pressure .
3.Test the supply line under the required pressure for a period of 1 hour. The pressure gauge must remain in place until each test period is complete.
4.Leaks that develop in the tested portion of the system must be located and repair after each test period if a drop of more than 5 psi is indicated by the pressure gauge. After the leaks have been repaired, repeat the 1 -hour pressure test until the drop in pressure is 5 psi or less. For a system consisting of a new supply line connected to an existing line, the new supply line must be isolated from the existing line and tested.
20-2.01A(4)(b)(iii) Method B
For Method B pressure testing for leakage:
1.Turn on the water and maintain at ful l pressure from the water source for a period not less than 8 consecutive hours after all the air has been expelled from the line for the portion of the supply line on the upstream side of the control valve to be backfilled. Perform the same test for a per iod not less than 1 hour for the portion of the supply on the downstream side of the control valve to be backfilled.
2.Repair leaks that develop in the tested portion of the system. After the leaks have been repaired, repeat the pressure test until no lea ks occur.
20-2.01A(4)(c) Sprinkler Coverage Check
After installation of the sprinklers, check and adjust the entire sprinkler system for proper orientation and uniform coverage. SECTION 20 LANDSCAPE
20-2.01A(4)(d) Irrigation System Functional Tests
The functional tests for each irrigation controller or group of controllers and associated irrigation system served by a single electric service point must consist of at least 1 complete cycle of operation. The Engineer determines the length of the cycle. In the presence of th e Engineer, perform a functional test for each system that demonstrates:
1.Components of the system are functioning and integrated with one another
2.Controller programming is complete including external weather, learned flow, and other system data inputs required to operate the system in the automatic mode
3.Watering schedule is appropriate for the plants, current weather, season, and site conditions
4.System has complete sprinkler coverage of the site Perform the tes t for each system:
1.Before planting the plants
2.After irrigation system repair work
3.Annually during plant establishment work
4.Not more than 30 days prior to contract acceptance
5.When ordered
20-2.01B Materials
20-2.01B(1) General
Concrete for replacing concrete facilities must be minor concrete. HMA for replacing asphalt concrete surfacing and facilities must comply with section 39 except you may use minor HMA only if authorized.
20-2.01B(2) Garden Valves
Each garden valve must:
1.Be the inverted nose type and of brass or bronze construction with a female thread inlet
2.Have a replaceable seat washer, a rising valve stem within a protective collar, and a male thread hose outlet
3.Have a loose key handle
20-2.01B(3) Recycled Water Identification
Irrigation components used for recycled water must be manufactured or painted purple. Recycled water irrigation pipe and tubing must have a permane nt label with the wording CAUTION: RECYCLED WATER every 24 inches in 2 rows spaced approximately 180 degrees apart in the longitudinal direction of the pipe or tubing. Each warning sign must:
1.Be PS -013(CA) or S28(CA) and comply with the California MUTCD
2.Be UV fade and weather resistant and manufactured from flexible vinyl with or without mylar
3.Have a self -adhesive backing Each warning decal must meet water supplier requirements and:
1.Show the phrase Recycled Water, Do Not Drink and the drinking -glass graphic symbol
2.Be UV fade and weather resistant and manufactured from flexible vinyl with or without mylar
3.Have a purple background, white text, and self -adhesive backing Each warning tag must:
1.Show the phrase RECYCLED WATER and the drinkin g-glass graphic symbol
2.Be UV fade and weather resistant
3.Be purple, double -sided, and manufactured from polyurethane
4.Have an integral neck attachment and attachment hole capable of withstanding 178 lb of pull -out resistance SECTION 20 LANDSCAPE
5.Have hot -stamped blac k lettering Posts and hardware for the warning signs must comply with section 82 -3. Concrete sprinkler protectors used with recycled water must be painted purple.
20-2.01B(4) Location Markers
Location markers must be schedule 40 white PVC plastic pipe.
20-2.01B(5) Pull Boxes
Pull boxes must comply with section 86 -1.02C and be no. 5 or larger. Pull boxes for low voltage conductors must not have side openings. Pull box cover s used for control and neutral conductors for irrigation equipment operated by the irrigation controller must be marked SPRINKLER CONTROL .
20-2.01B(6) Unions
Unions must be brass or malleable iron capable of withstanding the maximum required working pressure.
20-2.01B(7) Valve Boxes and Covers
Valve boxes must be precast concre te. Covers must be:
1.Concrete, steel, or cast iron
2.Marked WATER in cast -in letters not less than 1 inch high unless shown
3.1 piece, except 2 pieces are required if the weight of the valve box cover exceeds 35 lb Valve box covers must be labeled. La bels must:
1.Be predrilled plate plastic consisting of 2 layers of contrasting color
2.Be at least 1/8 inch thick
3.Have mechanically engraved inscriptions at least 1 inch high Covers for valve boxes that contain remote control valves must be labeled w ith the controller and station. Covers for valve boxes that contain irrigation equipment must be labeled with the standard abbreviation for that equipment.
20-2.01B(8) Wye Strainers
Wye strainers, except those used for drip valve ass emblies, must:
1.Have a cast iron or all bronze body
2.Have a removable stainless steel strainer screen with 40 -mesh woven wire
3.Have a 20 -mesh woven wire screen or perforated sheet with 0.045 -inch-diameter holes when on a backflow preventer assembly
4.Be capable of withstanding a working pressure of 150 psi
5.Be equipped with a garden valve at the outlet
20-2.01B(9) Woven Wire Cloth and Gravel
Woven wire cloth must be galvanized and manufactured with a minimum diameter of 19 -gauge wire and have squ are openings from 1/4 to 1/2 inches. Gravel must be 3/4 -inch gravel or crushed rock. Gravel or crushed rock must be clean, washed, dry, and free from clay or organic material.
20-2.01C Construction
20-2.01C(1) General
Immediately shut off water to broken pressurized irrigation components. Repair irrigation systems within 24 hours after a malfunction or damage occurs. SECTION 20 LANDSCAPE Connect underground metallic pipes, valves, or fittings made of dissimilar metals through a dielectric coupling or bushing. You may in stall conduits, conductors, and supply lines by methods other than trenching provided that they are not damaged and are installed at the depths described.
20-2.01C(2) Trenching and Backfilling
Perform trenching and backfilling under section 87 -1.03E(2). Rocks and debris encountered during trenching activity must be brought to the ground surface . When authorized by the Engineer, the removal of rocks and debris brought to the ground surface is change order work. Backfill each trench with material that is excavated from the trench. Each trench must have a uniform bearing throughout the entire length and must be free of jagged rubble , rock, broken concrete, asphalt concrete and sharp objects greater than 2 in ches in greatest dimension. Compact the backfill in the trench to a minimum relative compaction of 90 percent. If the trench backfill settles, place additional material and compact until the backfill is level with the surrounding grade. Ensure conduit, sup ply line, and joints are not moved or damaged by backfill activity. If trenching requires the removal of:
1.Plants: 1.1. Remove plants as necessary under section 20 -1.03C. 1.2. If plants are to remain, adjust the trench alignment to minimize damage. 1.3. If the supply line location interferes with the excavation of plant holes, relocate the plant hole away from the supply line. 1.4. Where authorized by the Engineer, prune trees and shrubs as necessary to complete the trenching work.
2.Turf: 2.1. Do not re move a width of more than 12 inches. 2.2. Replace with sod under section 20 -3.02C(3)(e).
3.Groundcover: 3.1. Do not remo ve a width of more than 6 feet. 3.2. Replace groundcover with plants from flats and plant at 12 inches on center under section 20 - 3.02C. 3.3. You may rototill existing Carpobrotus and Delosperma. Backfill for the trenches must not contain plants longer than 6 inches. No replacement of Carpobrotus and Delosperma is required if removed by rototilling.
4.Existi ng surface: 4.1. Make a minimum 2 -inch-deep saw cut along neat lines around the perimeter of the pavement to be removed at locations determined by the Engineer. 4.2. Place a minimum of 2 inches of sand bedding under and on top of supply lines and conduits. 4.3. Compact the backfill under the replacement surfacing to a minimum relative compaction of 95 percent. 4.4. Replace the structural section to match the removed materials. The s urface must have the same uniform smoothness, color, and texture as the adjacent surface. If trenching in areas to receive new surfacing:
1.Place a minimum of 2 inches of sand bedding under and on top of supply lines and conduits
2.Compact the backfill under the new surfacing to a minimum relative compaction of 95 perc ent
20-2.01C(3) Pull Boxes
Install pull boxes under section 87 -1.03C at the following locations:
1.At all conductor splices except splices made in valve boxes
2.Within 5 feet of irrigation controllers
3.At ends of electrical conduits SECTION 20 LANDSCAPE
4.At other locat ions shown
20-2.01C(4) Valve Boxes and Covers
In walkways and paved areas, install the top of the valve box flush with the surrounding finished grade. Install valve boxes on woven wire cloth and gravel or crushed rock. Space remote control valve boxes at least 2 feet from the edge of the adjacent valve box.
20-2.01C(5) Recycled Water Warning Signs
Install recycled water warning signs on irrigation facilities that use recycled water. Install sign decals directly to clean, smooth surfaces. Clean the surfac e with alcohol or an equivalent cleaner before applying the decal. Install a 4 -by-4-inch warning sign decal to each:
1.Backflow preventer assembly
2.Irrigation controller enclosure cabinet door Install a 2 -by-2-inch warning tag to each remote control valve and valve box cover. Install a 2 -1/2-by-3-inch sign decal to each sprinkler riser. Under local regulations, install a 12 -by-12-inch warning sign decal on an aluminum plate and attach to gates, fences, and walls located in the vicinity of a re cycled water irrigation system. On gates and fences, install signs with S hooks and C clips or 14 -gauge galvanized steel wire. On concrete walls or other rough surfaces, install signs with a silicon -based adhesive. In open areas, install signs on metal pos ts under section 82 -3.
20-2.01C(6) Garden Valves
Furnish 3 keys before Contract acceptance.
20-2.01D Payment
Not Used
20-2.02 Backflow Preventer Assemblies
20-2.02A General
20-2.02A(1) Summary
Section 20 -2.02 includes specifications for installing bac kflow preventer assemblies .
20-2.02A(2) Definitions
Reserved
20-2.02A(3) Submittals
Reserved
20-2.02A(4) Quality Assurance
Each backflow preve nter assembly must be certified by a backflow preventer tester. The tester must have an active and valid certification from the water purveyor having jurisdiction. If the local water purveyor does not have a certification program, the tester must be certif ied by AWWA or a nearby county with a certification program. Notify the Engineer at least 5 business days before certifying the backflow preventer assembly. Certify each backflow preventer assembly annually and within 10 days of Contract acceptance.
20-2.02B Materials
20-2.02B(1) General
Each backflow preventer assembly must include: SECTION 20 LANDSCAPE
1.Backflow preventer including gate valve, wye strainer, brass or malleable iron unions, fittings, and supports
2.Blanket
3.Enclosure
4.Concrete pad Concrete for the pad must be minor concrete, except the cementitious material content of the concrete must be at least 463 lb/cu yd. Hand mixing of the concrete is allowed.
20-2.02B(2) Backflow Preventers
Each backflow preventer must:
1.Be reduced -pressure principle type .
2.Comply with the specifications of the water purveyor that has jurisdiction.
3.Be factory assembled with: 3.1. 2 check valves. 3.2. 1 pressure differential relief valve. 3.3. 4 test cocks. 3.4. 2 shut -off valves manufactured from iron or bronze. Shut -off valves must be one of the following: 3.4.1. Resilient -wedge gate valves 3.4.2. Resilient -seated and fully -ported ball valves 3.4.3. Resilient -seated butterfly valves Backflow preventer components must be capable of withstanding a working pressure of 1 50 psi.
20-2.02B(3) Backflow Preventer Blankets
Each backflow preventer blanket must:
1.Be polyester fabric coated with vinyl or polymeric resin
2.Be resistant to UV light, water, mildew, and fire
3.Have an R -value from R -30 to R -38 Blankets must have a securing mechanism that includes zippers, hook -pile tape, grommets, snaps, buttons, or any combination of these. Wherever the backflow preventer is not in an enclosure, the securing mechanism must be capable of accepting a padlock.
20-2.02B(4) Backflow Preventer Enclosures
Each backflow preventer enclosure must:
1.Be made with a 10 -gauge minimum -thickness Type 304 stainless steel sheet
2.Have expanded metal side, end, and top panels with openings of ap proximately 3/4 by 1 -3/4 inches
3.Have expanded metal panels attached to the 3/16 -inch-thick frame by a series of welds not less than 1/4 inch in length and spaced not more than 4 inches on center, along the edges of the enclosure
4.Have lock guards with a minimum thickness of 12 gauge
5.Have hexagonal nuts and lock -type washers
6.Have padlock -clasp or latch -and-lock mechanism
20-2.02C Construction
Finish exposed top surface of concrete pad with a medium broom finish applied parallel to the long dimension of the pad. Install the hold -downs for the backflow preventer assembly enclosure when the concrete is still plastic.
20-2.02D Payment
Not Used
20-2.03 Cam Coupler Assemblies
20-2.03A General
Section 20 -2.03 includes specifications for installing cam coupler assemblies . SECTION 20 LANDSCAPE
20-2.03B Materials
Each cam coupler assembly must consist of a cam coupler, dust cap, check valve, pipes, fittings, concrete thrust block, and valve box with woven wire cloth and gravel. Cam couplers must be manufactured of brass or bronze and be able to withstand a working pressure of 150 psi.
20-2.03C Construction
Install cam coupler assemblies in valve boxes.
20-2.03D Payment
Not Used
20-2.04 Control and Neutral Con Ductors
20-2.04A General
20-2.04A(1) Summary
Section 20 -2.04 includes specifications for installing or extending 24 V(ac) control and neutral conductors between irrigation controllers and valve solenoids .
20-2.04A(2) Definitions
Reserved
20-2.04A(3) Submittals
Reserved
20-2.04A(4) Quality Assurance
Perform field tests on control and neutral conductors. Field tests must comply with the specifications in section 87 -1.01D(2)(a). Where the conductors are installed by trenching and backfilling, perform the test after a minimum of 6 inches of backfill material has been placed and c ompacted over the conductors.
20-2.04B Materials
Control and neutral conductors must comply with the provisions for conductors and cables in section 86- 1.02F. Electrical conduit and fittings must comply with section 86-1.02(B). Conductors must include a c ontrol conductor for each valve and a common neutral. Conductor insulation color, except for the stripes, must be continuous throughout. The color of the conductors must be consistent from the controller to each valve. Neutral conductors must be white. Do not use white for control conductors. Do not use conductors with green insulation except as allowed by the NEC. Conductors must be:
1.Of the size recommended by the manufacturer of the controllers to be installed
2.Rated for 36 V or 600 V for armor -clad
3.Rated for direct burial
4.Underground feeder cable Type UF and TWU
5.Solid, uncoated copper for armor -clad
6.Not less than 90 percent of the AWG diameter required No. 10 and smaller conductors must be insulated with a minimum of 56 mils of PVC or a minimum of 41 mils of polyethylene. No. 8 and larger conductors must be insulated with a minimum of 70 mils of PVC. No. 10 and smaller armor -clad conductors must be insulated with a minimum of 41 mils of polyethylene. No. 8 and larger armor -clad conductors must be insulated with 54 to 60 mils of PVC. Armor -clad conductors must include: SECTION 20 LANDSCAPE
1.Stainless steel tape armor, Type 304, helically wrapped with a 33 percen t minimum overlap. The tape must be 0.5 inch wide and at least 0.005 inch thick.
2.UV-resistant PVC outer conductor jacket complying with ICEA S -61-402, NEMA standard WC5 and UL listing 1263. The jacket nominal thickness must be from 24 to 30 mils.
20-2.04C Construction
20-2.04C(1) General
Reserved
20-2.04C(2) Conductors in Open Trenches
Do not install control and neutral conductors above each other in an open trench. Wrap conductors together with electrical tape at 10 foot intervals. Tie a 24 -inch loop of wire at all changes of direction that are greater than 45 degrees. Untie the loops after all the connections are made. Where conductors are installed in the same trench as the supply line, install at the same depth as the line. At other locations, install conductors not less than 12 inches below finished grade. Where conductors are not in a supply line trench, install conductors at least 4 feet from curbs, dikes, and paved shoulders.
20-2.04C(3) Conductors in Conduits
Install conductors in electrical conduit if conductors are to be:
1.Surface mounted
2.Installed in or on structures
3.Installed under paved areas
4.Installed in irrigation conduits
5.Placed in concrete
20-2.04C(4) Splicing
Splice conductors with a UL -listed connector manufactured for copper wire, direct burial irrigation systems. Connector must be prefilled with a mois ture sealing compound that encapsulates and protects the splice in a waterproof housing. Connector must be sized for the number and gauge of the conductors at the splice. Leave at least 2 feet of slack for each conductor at each:
1.Pull box
2.Valve box f or each conductor that is connected to other facilities within the box or spliced within the box Do not splice conductors in irrigation controller cabinets. Permanent splice connections must be made with freshly cut and skinned conductors. Do not use temp orary splices made for testing valve circuits as permanent splices.
20-2.04C(5) Marking
Mark control and neutral conductors in pull boxes, valve boxes, at irrigation control terminals, and at splices. Mark conductor terminations and splices with adhesive cloth wrap -around markers. Seal markers with clear, heat -shrinkable sleeves. Mark nonspliced conductors with clip -on, C -shaped, white extruded PVC sleeves. Sleeves must have black indented legends of uniform depth with transparent overlays over the legends and chevron cuts for the alignment of 2 or more sleeves. Identify markers for the control conductors with the appropriate irrigation controller and station number. SECTION 20 LANDSCAPE
20-2.04D Payment
Not Used
20-2.05 Flow Sensors
20-2.05A General
20-2.05B Materials
Each flow sensor must be an in -line type with a nonmagnetic spinning impeller as the only moving part. The electronics housing must:
1.Be schedule 80 PVC or cast 85 -5-5-5 bronze
2.Include glass -filled polyphenylene sulfide
3.Be easily removable from the meter body and include 2 ethylene -propylene O -rings The impeller must be glass reinforced nylon on a tungsten carbide shaft. The electronics must be rated to withstand prolonged water immersion conditions and include two 48 - inch-long single -conductor 18 AWG leads. The insulation must be direct burial UF type colored red for the positive lead and black fo r the negative lead. The flow sensor must be capable of withstanding:
1.100-to 400 -psi operating pressure depending on sensor size shown
2.Liquid temperatures up to 220 degrees F
3.Flows from 1/2 to 15 ft/sec
20-2.05C Construction
Not Used
20-2.05D Payment
Not Used
20-2.06 Irrigation Controllers
20-2.06A General
20-2.06A(1) Summary
Section 20 -2.06 includes specifications for installing irrigation controllers .
20-2.06A(2) Definitions
base station : Designated computer that collects data from a series of satellite controllers through a centralized server. centralized server : Designated server that collects data from all base stations. network communication: Identified means through which satellite controllers, base stations, and a centralized server communicate to one another, such as fiber optics, spread spectrum, and phone lines. remote access device : Wireless device , such as a n FCC-compliant radio remote, web-enabled smart phone, or wireless computer or tablet , used to communicate with satellite controllers from a remote location. remote irrigation control system : Centralized water -management system that consists of:
1.Base station
2.Centralized server or web -based application
3.Satellite controllers
4.Remote access device SECTION 20 LANDSCAPE satellite controller: Irrigation controller that communicates directly to a base station or centralized server. smart controller: Irrigation controller that estimates or measures dep letion of available plant soil moisture to operate an irrigation system, replenishing water as needed while minimizing excess water use. web-based application: Encrypted managing software that is coded in a browser -supported language and is executable via a common Internet web browser, such as Internet Explorer, Firefox, and Safari.
20-2.06A(3) Submittals
Submit a complete manufacturer's maintenance and operations manual for each type of installed controller as an informational submittal. After the work is complete, submit 3 copies of the as -built shop drawings, including any wire modifications for each controller installed. For each controller, laminate and place in an envelope 1 copy of:
1.As-built schematic wiring diagram , including wiring modifications
2.11-by-17-inch as -built irrigation plan The laminate must be clear, mat -finished plastic that is at least 10 mils thick. The envelope must be heavy -duty plastic. Attach the envelope to the inside of the controller enclosure or cabinet door. If the door is not large enough to secure the envelope, submit the envelope and its contents.
20-2.06A(4) Quality Assurance
Provide training by a qualified person on the use and adjustment of the installed irrigation controllers at least 30 days before Contract acce ptance. Modifications to electrical components must be done by the manufacturer before shipment to the job site. The installation date and expiration date of the manufacturer's guarantee for the controllers must be permanently marked on the inside face of the controller.
20-2.06B Materials
20-2.06B(1) General
Conventional AC -powered irrigation controllers must operate on 120 V(ac), 60 Hz, and supply from 24 to 30 V(ac), 60 Hz for operating electrical remote control valves. Concrete for the pad and foun dation must be minor concrete except the cementitious material content of the concrete must be at least 463 lb/cu yd. Hand mixing of the concrete is allowed.
20-2.06B(2) Irrigation Controllers
20-2.06B(2)(a) General
The irrigation controllers must:
1.Be a smart controller from a single manufacturer.
2.Be fully automatic and capable of operating a complete 30 -day or longer irrigation program.
3.Have a switch or button on the face of the irrigation control panel showing that the irrigation controller can be turned on or off and provide for automatic or manual operation. Manual operation must allow cycle start at the desired station and allow for the minimum activation of a single station or have the option to operate multiple stations in sequential or sim ultaneous operation modes.
4.Have nonvolatile memory.
5.Have a watering time display on the face of the control panel.
6.Have a panel and circuit board connected to the low voltage control and neutral conductors by means of a plug and receptacle connect ors located within the cabinet enclosure.
7.Have a variable or incremental timing adjustment ranging from 1 to 360 minutes per station.
8.Be capable of operating at least 3 program schedules. SECTION 20 LANDSCAPE
9.Be capable of having at least 4 start times per program sch edule.
10.Have an output that can energize a pump start circuit or a remote control master valve.
11.Be protected by fuses and circuit breakers.
12.Display a program and station affected by a sensory alert without changing other watering schedules not a ffected by the alert.
13.Be capable of global manual and automatic seasonal adjustments to all valves in any given program.
14.Automatically change watering schedule based on evapotranspiration data provided by a local weather station or have an internal programmed default of historical evapotranspiration data for a given region.
15.Support a flow sensor, and a rain sensor or access to a weather station, and have automatic shut -off capability.
16.Be capable of communicating with the remote access device . If the irrigation controller is installed in an enclosure cabinet, the cabinet must be stainless steel and must comply with section 20 -2.06B(3). Irrigation controllers not installed in enclosure cabinets must be weatherproof, constructed of fiberglass or metal, and have a door lock with 2 keys provided. Remote irrigation systems must comply with the specifications for irrigation controllers and be accessible only through a secured and encrypted server that is password -and firewall -protected by the Department, or through a firewall -secured remote server that is independent from any Department servers. The Department will set up and manage the network communication. Notify the Engineer at least 10 business days before accessing the network comm unications to integrate new irrigation controllers into the network.
20-2.06B(2)(b) Battery Powered Irrigation Controllers
Reserved
20-2.06B(2)(c) Solar Powered Irrigation Controllers
Reserved
20-2.06B(2)(d) Two -wire Irrigation Controllers
Reserved
20-2.06B(3) Irrigation Controller Enclosure Cabinets
The irrigation controller enclosure cabinet must comply with section 86 -1.02Q and must:
1.Be minimum 14 -gauge Type 304 stainless steel.
2.Include a mounting panel. Fabricate mounting panels using any of the following materials: 2.1. 3/4-inch exterior AC grade veneer plywood. Paint panels with 1 application of an exterior, latex based, wood primer and 2 applications of an exterior, vinyl acr ylic enamel, white in color. Paint panels on all sides and edges before installation of the panels in the cabinets and the equipment on the panels. 2.2. 3/16-inch-thick aluminum sheets. 2.3. 10-gauge cold -rolled steel sheets. 2.4. 0.157 -inch stainless stee l metal sheets.
3.Provide cross ventilation, roof ventilation, or a combination of both. Ventilation must not compromise the weather resistance properties of the cabinet and must be fabricated by the cabinet manufacturer.
4.Include protection against lig htning damage.
5.Have an area inside the cabinet doors for storage of the as -built schematic wiring diagram and irrigation plans.
6.Have padlock clasp or latch and lock mechanism.
20-2.06B(4) Rain Sensors
Rain sensor units must be a solid -state, automa tic shut -off type, and compatible with the irrigation controller. The rain sensor unit must automatically interrupt the master remote control valves if approximately 1/8 inch of rain has fallen. The irrigation controller must automatically be enabled again when the accumulated rainfall evaporates from the rain sensor unit collection cup. SECTION 20 LANDSCAPE Rain sensor units must be one of the following:
1.Rated from 24 to 30 V(ac)
2.Wireless and FCC compliant
20-2.06C Construction
Install the irrigation controller enclosure cabinet under 87 -1.03Q(1). Finish the exposed top surface of concrete pad with a medium broom finish applied parallel to the long dimension. Install electrical components for automatic irrigation systems under section 8 7. Install irrig ation controllers under the manufacturer's instructions. If 2 or more irrigation controllers operate the same remote master control valve, install an isolation relay under the controller manufacturer's instructions. Where direct burial conductors are to be connected to the terminal strip, connect the conductors with the open -end-crimp -on wire terminals. Exposed wire must not extend beyond the crimp of the terminal and the wires must be parallel on the terminal strip. Install rain sensor units for irrigation controllers on the irrigation controller enclosure cabinets. Provide protection against lightning damage.
20-2.06D Payment
Payment for 120 -volt or higher electrical service is not included in the payment for any type of irrigation controller.
20-2.07 Irrigation Conduit
20-2.07A General
20-2.07A(1) Summary
Section 20 -2.07 includes specifications for installing irrigation conduit . Before performing work on irriga tion systems, locate existing irrigation conduits shown to be incorporated into the new work. Before removing or disturbing existing pavement markers that show the location of the existing irrigation conduit, mark the location of the existing conduit on th e pavement.
20-2.07A(2) Definitions
Reserved
20-2.07A(3) Submittals
Reserved
20-2.07A(4) Quality Assurance
Demonstrate that the irrigation conduits are free from obstructions after placement of base and surfacing. Before and after extending the irrigati on supply line in an irrigation conduit, pressure test the supply line under section 20 -2.01A(4)(b). After conductors are installed in an irrigation conduit, test the conductors under section 20-2.04A(4) . Assign a technical representative to direct and control the directional bore activities. The representative must be present during directional bore acti vities. Unless otherwise authorized, perform directional bore activities in the presence of the Engineer.
20-2.07B Materials
20-2.07B(1) General
Reserved SECTION 20 LANDSCAPE
20-2.07B(2) ABS Composite Pipe Conduit
ABS composite pipe and couplings must comply with ASTM D2680 . Couplings must be solvent cement type.
20-2.07B(3) Corrugated HDPE Pipe Conduit
Corrugated HDPE pipe must comply with ASTM F667 or be Type S complying with AASHTO M252 or AASHTO M294. Couplings and fitting must be as recommended by the pipe manufacturer .
20-2.07B(4) Corrugated Steel Pipe Conduit
Corrugated pipe conduit must comply with section 66. The nominal thickness of metal sheets for pipe must be 0.064 inch for corrugated steel pipe and 0.060 inch for corrugated aluminum pipe. Coupling bands and ha rdware must comply with section 66.
20-2.07B(5) PVC Pipe Conduit and PVC Pipe Conduit Sleeve
PVC pipe conduit and PVC pipe conduit sleeve must be schedule 40 complying with ASTM D1785. Fittings must be schedule 80.
20-2.07B(6) Welded Steel Pipe Conduit
Welded steel pipe must comply with ASTM A53. Pipe must be black and have either welded or threaded joints. The wall thickness for the various s izes of welded steel pipe must have the thickness shown in the following table: Nominal pipe size (inch) Minimum w all thickness (inch) 3 0.216 4 0.237 6 0.280 8 0.277 10 0.279 12 0.330
20-2.07C Construction
20-2.07C(1) General
If existing irrigation conduits are to be incorporated into new work, excavate exploratory holes for locating existing conduits at the locations indicated by existing markers or as directed. Excavate and backfill exploratory holes to a maximum size of 2 -1/2 feet in width, 5 feet in depth, and 5 feet on each side of the marker or directed location parallel to the roadway. If the conduit is not found and if ordered, increase the size of the exploratory holes beyond the dimensions specified. The additional exc avation and backfill is change order work. If extending an existing conduit, remove the existing conductors from the conduit. Use a coupling band if the new conduit matches the existing conduit diameter; otherwise overlap the conduit at least 12 inches. After extending the existing conduits, install conductors that match the color and size of the existing conductors without splices. Splice conductors in adjacent pull boxes. If installing a control and neutral conductor and electrical conduit through the i rrigation conduit, install a no. 5 pull box at each end. Remove any debris found in the conduit before performing other work. Removing debris located more than 3 feet from the ends of the conduits is change order work. Extend conduit 2 feet beyond all pavi ng. Cap the ends of unused conduit. SECTION 20 LANDSCAPE Place Type G pavement markers with retroreflective face facing away from the oncoming traffic under section 81 -3 on paved shoulders or dikes at irrigation conduit locations where authorized.
20-2.07C(2) Welded Steel Pip e Conduit
20-2.07C(2)(a) General
Install welded steel pipe by directional boring or jack and drill.
20-2.07C(2)(b) Directional Boring
Notify the Engineer at least 2 business days before starting directional bore activities. The diameter of the boring too l for directional boring must be only as large as necessary to install the conduit. Mineral slurry or wetting solution may be used to lubricate the boring tool and to stabilize the soil surrounding the boring path. The mineral slurry or wetting solution mu st be water based. The directional bore equipment must have directional control of the boring tool and have an electronic boring tool location detection system. During operation, the directional bore equipment must be able to determine the location of the tool both horizontally and vertically.
20-2.07C(2)(c) Jack and Drill
Notify the Engineer at least 2 business days before starting jack and drill activities. Jacking or drilling pits must be no closer than 2 feet from the pavement edge whenever possible. If authorized, small holes may be cut in the pavement to locate or remove obstructions. Do not use excessive water that will soften the subgrade or undermine the pavement.
20-2.07C(3) PVC Pipe Conduit and PVC Pipe Conduit Sleeve
Where shown, install PVC pi pe conduit and PVC pipe conduit sleeve under surfacing. PVC pipe conduit under surfacing must be installed using direct ional boring under section 20 -2.07C(2)(b). Cap ends of conduit until used.
20-2.07D Payment
Not Used
20-2.08 Irrigation Supply Line
20-2.08A General
20-2.08A(1) Summary
Section 20 -2.08 includes specifications for installing irrigation supply line .
20-2.08A(2) Definitions
Reserved
20-2.08A(3) Submittals
Submit a certificate of compliance for polyethylene pipe and plastic pipe supply line.
20-2.08A(4) Quality Assurance
Solvent cement must comply w ith local air quality management district provisions.
20-2.08B Materials
20-2.08B(1) General
Concrete for thrust blocks must be produced from commercial -quality aggregates. The concrete must contain at least 295 pounds of cementitious material per cubic yard.
20-2.08B(2) Copper Pipe Supply Line
Copper pipe must be Type K rigid pipe complying with ASTM B88. Fittings must be wrought copper or cast bronze ei ther soldered or threaded. SECTION 20 LANDSCAPE Solder must be 95 percent tin and 5 percent antimony.
20-2.08B(3) Galvanized Steel Pipe Supply Line
Galvanized steel pipe supply line and couplings must be standard weight complying with ASTM A53, except that the zinc coating mu st not be less than 90 percent of the specified quantity. Except for couplings, the fittings must be galvanized malleable iron, banded and threaded, and comply with ANSI B16.3, Class 150. Joint compound must be nonhardening and noncorrosive. Do not use pip e thread sealant tape.
20-2.08B(4) Drip Irrigation Tubing
Drip irrigation tubing must be virgin polyethylene plastic complying with ASTM D2737. The drip irrigation tubing must be distribution tubing with preinstalled in -line emitters. If preinstalled in -line drip irrigation tubing is not shown, you may install emitters that match the distribution specifications shown. The emitters must be barbed or threaded -type outlet devices with dual silicone diaphragms . When tested under ASTM D2122, the wall thickness of polyethylene tubing must have the thickness shown in the following table: Nominal pipe size (inch) Minimum wall thickness (inch) Maximum wall thickness (inch) 1/2 0.050 0.070 5/8 0.055 0.075 3/4 0.060 0.080 The polyethylene tubing fittings must be leak -free, compression type and have female sockets with an internal barb to provide a positive pipe -to-fitting connection that will not separate at the designed pressure.
20-2.08B(5) Plastic Pipe Sup ply Line
Plastic pipe supply line must be PVC pipe that is NSF approved. Schedule 40 plastic pipe supply line must comply with ASTM D1785. Class 315 plastic pipe supply line must comply with ASTM D2241. PVC gasketed bell joints must comply with ASTM D2672, ASTM D2241, ASTM D3139, and ASTM F477. For solvent -cemented type joints, the primer and solvent cement must be made by the same manufacturer. The primer color must contrast with the color of the pipe and fittings. Solvent -cemented fittings for schedule 40 plastic pipe supply line must be injection molded PVC, schedule 40, and comply with ASTM D2466. Solvent -cemented fittings for class 315 plastic pipe supply line must be injection molded PVC, schedule 80, and comply with ASTM D1784 and ASTM D2467. Fittings for a supply line placed in an irrigation conduit must be schedule 80. Fittings for a plastic pipe supply line larger than 4 inches must be ductile iron complying with section 20 - 2.13C(2)(b). If UV -resistant plastic pipe supply line is required, the pipe must be homogeneous, a uniform color, and manufactured of:
1.At least 80 percent vinyl chloride resin with UV stabilizers
2.Non-PVC resin modifiers and coloring ingredients
3.Coloring ingredients with UV stabilizers SECTION 20 LANDSCAPE
20-2.08C Construction
20-2.08C(1) General
Cut pipe straight and true. After cutting, ream out the ends to the full inside diameter of the pipe. Prevent foreign material from entering the irrigation system during installation. Immediately before assembling, clean all pipes, val ves, and fittings. Flush lines before attaching sprinklers, emitters, and other terminal fittings. Reuse water from waterline flushing for landscape irrigation if practicable. Pipe supply lines installed between the water meter and backflow preventer assem bly must be installed at least 18 inches below finished grade measured to the top of the pipe. Where a connection is made to existing supply lines, belled and gasketed fittings or compression fittings may be used. Install a thrust block at each change in d irection on the main supply line, terminus run, and at other locations shown. Where supply lines cross paved ditches more than 3 feet deep at their flow line, install galvanized steel pipe for the entire span of the ditch.
20-2.08C(2) Galvanized Steel Pip e Supply Line
Coat male pipe threads on galvanized steel under the manufacturer's instructions.
20-2.08C(3) Drip Irrigation Tubing
Install drip irrigation tubing on grade and under manufacturer's instructions. If preinstalled in -line drip irrigation tubin g is not shown, install emitters under manufacturer's instructions. Install a flush valve and an air -relief valve if recommended by the drip valve assembly manufacturer.
20-2.08C(4) Plastic Pipe Supply Line
For PVC pipe 1 -1/2 inches in diameter or smaller , cut the pipe with PVC cutters. For solvent -cemented type joints, apply primer and solvent -cement separately under the manufacturer's instructions. Wrap the male portion of each threaded plastic pipe fitting with at least 2 layers of pipe thread sealant tape.
20-2.08D Payment
The payment quantity for any type of supply line pipe or drip irrigation tubing is the length measured along the slope.
20-2.09 Sprinkler Assemblies
20-2.09A General
Section 20 -2.09 includes specifications for installing sprinkler assemblies .
20-2.09B Materials
20-2.09B(1) General
Swing joints must match the inlet connection size of the riser. Where shown, a sprinkler assembly must include a check valve. Threaded nipples for swing joints and risers must be schedule 80, PVC 1120 or PVC 1220 pipe, and comply with ASTM D1785 . Fittings for sprinkler assemblies must be injection -molded PVC, schedule 40, and comply with ASTM D2466. Flexibl e hose for sprinkler assemblies must be leak -free, non -rigid and comply with ASTM D2287. The hose must comply with ASTM D2122 and have the thickness shown in the following table: SECTION 20 LANDSCAPE Nominal hose diameter (inch) Minimu m wall thickness (inch) 1/2 0.127 3/4 0.154 1 0.179 Solvent cement and fittings for flexible hose must comply with section 20 -2.08B(5).
20-2.09B(2) Pop -Up Sprinkler Assemblies
Each pop -up sprinkler assembly must include a body, nozzle, swing joint, pressure reducing device, fittings, and sprinkler protector where shown.
20-2.09B(3) Riser Sprinkler Assemblies
Each riser sprinkler assembly must include a body, flexible hose, threaded nipple, nozzle, swing joint (except for a Type V riser), pres sure reducing device, fittings, and riser support where shown.
20-2.09B(4) Tree Well Sprinkler Assemblies
Each tree well sprinkler assembly must include a threaded nipple, nozzle, swing joint, fittings, perforated drainpipe, and drain grate. The perforated drainpipe must be commercial -grade, rigid PVC pipe with holes spaced not more than 6 inches on center on 1 side of the pipe. The drain grate must be a commercially -available, 1 -piece, injection -molded grate manufactured from structural foam poly olefins with UV light inhibitors. Drain grate must be black. Gravel for filling the drainpipe must be graded such that 100 percent passes the 3/4 -inch sieve and 100 percent is retained on the 1/2 -inch sieve. The gravel must be clean, washed, dry, and free from clay or organic material.
20-2.09C Construction
Where shown, install a flow shut -off device under the manufacturer's instructions, unless you use equipment with a preinstalled flow shut -off device. Where shown, install a pressure reducing device unde r the manufacturer's instructions, unless you use equipment with a preinstalled pressure reducing device. Install pop -up and riser sprinkler assembly:
1.From 6 -1/2 to 8 feet from curbs, dikes, and sidewalks
2.At least 10 feet from paved shoulders
3.At least 3 feet from fences and walls If sprinkler assembly cannot be installed within these limits, the location will be determined by the Engineer. Set sprinkler assembly riser on slopes perpendicular to the plane of the slope.
20-2.09D Payment
Not Used
20-2.10 Valves
20-2.10A General
20-2.10B Materials
20-2.10B(1) General
Reserved SECTION 20 LANDSCAPE
20-2.10B(2) Ball Valves
Each ball valve must be a 2 -piece brass or bronze body with a minimum nonshock working pressure of 400 psi. The seats and O -ring seals must be PTFE.
20-2.10B(3) Check Valves
Each check valve must be one of the following :
1.Schedule 80 PVC with a factory setting to withstand a minimum 7 -foot head on risers
2.Class 200 PVC if used on a nonpressurized plastic irrigation supply line
3.Internal to the sprinkler body with a factory setting to withsta nd a minimum 7 -foot head
20-2.10B(4) Drip Valve Assemblies
Each drip valve assembly must include:
1.Remote control valve
2.Wye filter with: 2.1. Filter housing that: 2.1.1. Can withstand a working press ure of 150 psi 2.1.2. Is manufactured of reinforced polypropylene plastic 2.2. Reusable stainless steel filter cartridge with a 200 mesh size filtration
3.Schedule 80 PVC pipes and fittings
4.Pressure regulator
20-2.10B(5) Garden Valve Assemblies
Each garden valve assembly must have:
1.Garden valve
2.Location marker
20-2.10B(6) Gate Valves
Each gate valve must be:
1.Flanged or threaded type
2.Iron or bronze body
3.Bronze trimmed with one of the following: 3.1. Female thread rising stem 3.2. Non-rising stem
4.Able to withstand a working pressure of 150 psi Gate valves smaller than 3 inches must have a cross handle. Gate valves 3 inches or larger must be flanged type with a square nut. Gate valves attached to the outlets of a wye strainer must have PTFE seating rings on the discharge side of the gate valves. Valve wedges must be driven obliquely by cam action into the seating rings. Flanged adapters used t o connect pipe to gate valves must be metal.
20-2.10B(7) Pressure Regulating Valves
Each pressure regulating valve used on the downstream side of the control valves must be:
1.Threaded type with outf low pressure clearly marked on the regulator
2.Plastic body with a working pressure of 125 psi or greater
3.Stainless -steel compression spring Each pressure regulating valve used on the upstream side of the control valves must be:
1.Flanged or threaded and manufactured of brass or bronze
2.Capable of withstanding a working pressure of 300 psi or greater
3.Adjustable with a stainless -steel spring and seat
4.Tapped and plugged for a pressure gauge and if shown with a gauge installed SECTION 20 LANDSCAPE
20-2.10B(8) Press ure Relief Valves
Each pressure relief valve must have:
1.Brass or bronze body
2.Stainless steel springs
3.Bronze nickel chrome seats
4.Composition seat discs
5.Female bottom inlets
6.Female side outlets
20-2.10B(9) Quick Coupling Valves
Each quick coupling valve must be 3/4 -inch double slotted with a self -closing cap, 3/4 -inch brass key and 3/4-inch brass hose swivel. Except for the cap, quick co upling valve must be brass or bronze construction.
20-2.10B(10) Remote Control Valves
20-2.10B(10)(a) General
Each remote control valve must:
1.Be normally closed type.
2.Be glass -filled nylon, brass, o r bronze.
3.Be completely serviceable from the top without removing the valve body from the system.
4.Be equipped with a device that regulates and adjusts the flow of water and be provided with a manual shut-off. The manual shut -off for valves larger tha n 3/4 inch must be operated by a cross handle.
5.Have solenoids compatible with the irrigation controller.
6.Have a manual bleed device.
7.Be capable of withstanding a pressure of 200 psi.
8.Have replaceable compression discs or diaphragms.
9.Have thr eaded fittings for inlets and outlets.
10.Have DC latching solenoids if used with solar or battery controllers. Solenoids must operate on 3.5 V.
11.Be bottom, angled, or straight inlet configuration.
20-2.10B(10)(b) Remote Control Valves with Flow Sens or
Reserved
20-2.10B(10)(c) Remote Control Valves with Pressure Regulator
Each remote control valve with pressure regulator must be factory assembled as 1 unit.
20-2.10B(11) Automatic Flush Valve
Automatic flush valve body must be one -piece thermoplastic threaded type. The body must be serviceable by unthreading the valve from the male adapter. The body must use a molded synthetic rubber seal. Valve must open automatically. The seat must be constructed of molded synthetic rubber that is held in the open p osition with a stainless steel spring. Flush rate must be at least 1.5 gpm at 60 psi.
20-2.10B(12) Air or Vacuum Relief Valve
Air relief valve body must be thermoplastic. Valve must be continuous acting air vent type. Valve must have a minimum release rat e volume of 260 cfm at 5 psi.
20-2.10C Construction
20-2.10C(1) General
All valves must be installed in a valve box with a cover except:
1.Check valves
2.Garden valves
3.Pressure regulating valves installed on backflow preventers SECTION 20 LANDSCAPE
20-2.10C(2) Control Valves
Install control valves:
1.From 6 -1/2 to 8 feet from curbs, dikes, and sidewalks
2.At least 10 feet from paved shoulders
3.At least 3 feet from fences, walls, or both If a control valve cannot be installed within these limits , the location will be determined by the Engineer.
20-2.10C(3) Check Valves
Install check valves as necessary to prevent low -head drainage.
20-2.10C(4) Garden Valve Assemblies
Install a location marker from 8 to 10 inches from the back of each garden val ve assembly.
20-2.10C(5) Gate Valves
Furnish 3 long shank keys before Contract acceptance.
20-2.10C(6) Pressure Regulating Valves
Install pressure regulating valves with threaded connections and a union on the inlet side of the valves.
20-2.10C(7) Quick Coupling Valves
Furnish 3 loose quick coupling brass keys and brass hose swivels before Contract acceptance.
20-2.10C(8) Automatic Flush Valve
Install automatic flush valve under manufacturer's instructions. Valve box must contain a gravel bed that will absorb at least 1 gpm of water.
20-2.10C(9) Air Relief Valve
Install air relief valve under the manufacturer's instructions .
20-2.10D Payment
Not Used
20-2.11 Wye Strainer Assemblies
20-2.11A General
Section 20 -2.11 includes specifications for installing wye strainer assemblies .
20-2.11B Materials
Each wye strainer assembly must include:
1.Wye strainer
2.Valve box and cover
20-2.11C Construction
Install wye strainer asse mbly on the upstream side of the control valve. Install garden valve such that the discharge sprays out of the valve box when the system is flushed.
20-2.11D Payment
Not Used
20-2.12 Reserved
20-2.13 Supply Line On Structures
20-2.13A General
20-2.13A(1) General
20-2.13A(1)(a) Summary
Section 20 -2.13A includes general specifications for installing water supply lines through bridges and on the exterior of concrete structures . SECTION 20 LANDSCAPE
20-2.13A(1)(b) Definitions
Reserved
20-2.13A(1)(c) Submittals
Submit a work plan for the temporary casing support at the abutments as an informational submittal.
20-2.13A(1)(d) Quality Assurance
20-2.13A(1)(d)(i) General
Before installing seismic expansion assemblies or expansion assemblies, the Engineer must authorize the extension setting.
20-2.13A(1)(d)(ii) Regulatory Requirements
Piping materials must bear the label, stamp, or other markings of the specified standards.
20-2.13A(1)(d)(iii) Quality Control
Test water supply lines before:
1.Backfilling
2.Starting work on box girder cell decks
3.Otherwise covering the water supply lines Furnish pipe anchorages to resist thrust forces occurring during testing. Test the water supply lines as 1 unit. The limits of the unit must be 5 feet beyond the casing at each end of the bridge. Cap each end of the water supply lines before testing. Caps must be rated for the test pressure. Test water supply lines under section 20 -2.01A(4)(b), except that the testing period must be 4 hours with no pressure drop. Place water supply lines 4 inches and larger under a pressure of at least 120 psi during testing. Air relief valves must not be subjected to pressure testing. If water supply lines fail testing, retest the lines after repair.
20-2.13A(2) Materials
20-2.13A(2)(a) General
Protect stored piping from moisture and dirt. Elevate piping above grade. Support piping to prevent sagging and bending. Protect flanges, fittings, and assemblies from moisture and dirt .
20-2.13A(2)(b) Air Release Valve Assemblies
Each air release valve assembly must include an air release valve, ball valve, tank vent, nipples, and pipe saddle. Air release valves must have a cast iron body with stainle ss steel trim and float, 1 -inch NPT inlet, 1/2 -inch NPT outlet, and 3/16 -inch orifice. Ball valves must have a 2 -piece bronze body with chrome plated or brass ball and 1 -inch full -size port and be rated for at least 400 psi. Tank vents must have a 1/2 -inch NPT inlet and downward -facing double openings with screened covers. Nipples must be schedule 40 galvanized steel pipe. Pipe saddle must be rated for at least 150 psi and be compatible with the water supply line. Pipe saddle for water supply lines smaller than 4 inches must be a single strap pipe saddle. Pipe saddle for water supply lines 4 inches and larger must be a double strap pipe saddle. You may use a tee fitting for galvanized steel water supply lines. SECTION 20 LANDSCAPE
20-2.13A(2)(c) Casings
Casings must be welded steel pipe casing and comply with section 70 -7.
20-2.13A(2)(d) Pipe Wrap Tape
Pipe wrap tape must be pressure sensitive tape made from PVC or polyethylene. Pipe wrap tape must be at least 50 mils thick and not wider than 2 inches.
20-2.13A(2)(e) P ipe Hangers
Pipe hangers must comply with section 70 -7.02C. The pipe hanger must be rated for the water supply line. If casings are shown, include the weight of the casing.
20-2.13A(2)(f) Epoxy Adhesives
Epoxy used for anchoring concrete pipe supports mus t comply with section 70 -7.02D.
20-2.13A(2)(g) Concrete Pipe Supports
Concrete pipe supports must comply with section 70 -7.02D.
20-2.13A(2)(h) Pipe Clamps and Anchors
Metal clamps must be commercial -quality steel and comply with section 75 -2. Anchors mus t comply with the specifications for concrete anchorage devices in section 75 -3.02C.
20-2.13A(2)(i) Pull Boxes
Each pull box and cover must comply with section 20 -2.01B(5).
20-2.13A(3) Construction
20-2.13A(3)(a) General
Support water supply lines as de scribed. Where water supply lines penetrate bridge superstructure concrete, either form or install pipe sleeves at least 2 pipe sizes larger than the pipe.
20-2.13A(3)(b) Preparation
Clean the interior of the pipe before installation. Cap or plug openings as pipe is installed to prevent the entrance of foreign material. Leave caps or plugs in place until the adjacent pipe section is installed.
20-2.13A(3)(c) Installation
20-2.13A(3)(c)(i) General
Reserved
20-2.13A(3)(c)(ii) Casings
Install each casing under section 70 -7.03. Seal casing end with 8 inches of polyurethane foam at dirt stop or pipe end seal.
20-2.13A(3)(c)(iii) Wrapping Water Supply Line
Wrap damaged supply line coatings with pipe wrap tape. Wrap field joints and fittings that are i n contact with the earth. Wrapping must be clean. Prime the area as recommended by the tape manufacturer. Tightly wrap the tape with 1/2 uniform overlap, free from wrinkles and voids, and provide not less than a 100 mil thickness. The tape must conform to the joint or fitting contours. Extend the tape at least 6 inches over adjacent pipe.
20-2.13A(3)(c)(iv) Pipe Clamps and Anchors
Install water supply lines on the exterior surfaces of bridges or other concrete structures with metal clamps and anchors. SECTION 20 LANDSCAPE Drill holes for anchors to the manufacturer's recommended depth. Drilling tools must be authorized. Do not drill holes closer than 6 inches from the edge of a concrete structure. Relocate holes if reinforcing steel is encountered. Fill abandoned holes with mor tar. Mortar must comply with section 51 -1.02F. Where water supply lines are mounted vertically for more than 2 feet, install clamps and anchors within 6 inches of the elbows. Where water supply lines are mounted vertically for more than 10 feet, install ad ditional clamps and anchors at 10 -foot maximum centers.
20-2.13A(3)(d) Sequences of Operation
If the bridge superstructure is to be prestressed, do not place mortar around casings in abutments and hinges until bridge superstructure prestressing has been c ompleted.
20-2.13A(4) Payment
The payment quantity for a supply line on structures is the length measured from end to end along the centerline. The Department does not pay for failed tests.
20-2.13B Supply Line on Structures, Less than 4 Inches
20-2.13B(1) General
20-2.13B(1)(a) Summary
Section 20 -2.13B includes specifications for installing water supply lines smaller than 4 inches on structures.
20-2.13B(1)(b) Definitions
Reserved
20-2.13B(1)(c) Submittals
Product data for materials includes catalog cuts, performance data, and installation instructions. Submit product data for :
1.Water supply line
2.Expansion assemblies
3.Casing insulators
4.Pipe end seals
5.Pipe anchorages
6.Air release valve assemblies
7.Casings
8.Pipe hangers
9.Epoxy adhesives
10.Concrete pipe supports
20-2.13B(1)(d) Quality Assurance
Reserved
20-2.13B(2) Materials
20-2.13B(2)(a) General
Reserved
20-2.13B(2)(b) Water Supply Line
Water supply line must comply with section 20 -2.08.
20-2.13B(2)(c) Expansion Assembl ies
Each expansion assembly must consist of a hose with ends, insulated flange connections, and elbows. Each expansion assembly must have the same nominal inside diameter as the water supply line. Working pressure must be at least 150 psi. SECTION 20 LANDSCAPE Hose must be med ium or heavy weight, crush and kink resistant, and rated for at least 150 psi. Cover must be flexible, oil -resistant rubber or synthetic, and reinforced with at least 2 -ply synthetic yarn or steel wire. The inner tube must comply with FDA and USDA standards for potable water. Hose ends must be stainless steel flanged connections with stainless steel crimped bands or swaged end connectors. Do not use barbed ends with band clamps. Elbows must be 45 -degree standard -weight galvanized steel fittings.
20-2.13B(2)(d) Casing Insulators
Each casing insulator must be:
1.2-piece, high -density, injection -molded polyethylene and must have a nonconductive inner liner with hot-dip galvanized nuts and bolts.
2.Factory -constructed to ensure the water supply line is centered in the casing. The insulator must not allow any contact between the pipe and casing and have at least 2 runners seated on the bottom of the casing.
3.Sized for the casing and water supply line shown.
20-2.13B(2)(e) Pipe Anchorages
Each pipe anchorage must consist of an I -beam, U -bolts, anchors, and double nuts. Use concrete anchorage devices for anchors on existing bridges. Use L -anchor bolts for anchors on new bridges. Fabricate the I -beam from 1/2 -inch steel plate. Steel plate, U -bolts , L-anchors, and nuts must comply with section 75 -2. Concrete anchorage devices must comply with section 75 -3.02C.
20-2.13B(2)(f) Pipe End Seals
Each pipe end seal must consist of a pipe end seal, stainless steel bands, and polyurethane foam. Pipe end sea l must be factory -constructed from seamless neoprene and sized for the casing and water supply line shown. Neoprene must be at least 1/8 inch thick. Stainless steel bands must be crimped. Polyurethane foam must be expanding foam spray that is water resista nt and moisture cured.
20-2.13B(3) Construction
Locate pipe anchorage halfway between expansion assemblies. Pipe end seal must be pulled onto the casing during pipe installation. Do not use wrap -around type end seals.
20-2.13B(4) Payment
Not Used
20-2.13C Supply Line on Structures, 4 Inches and Larger
20-2.13C(1) General
20-2.13C(1)(a) Summary
Section 20 -2.13C includes specifications for installing 4 -inch and larger water supply lines on structures.
20-2.13C(1)(b) Definitions
Reserved
20-2.13C(1)(c) Submittals
Product data for materials includes catalog cuts, performance data, and installation instructions. Submit product data for :
1.Water supply line
2.Expansion assemblies
3.Flange insulating gaskets
4.Casing insulators SECTION 20 LANDSCAPE
5.Seismic expansion assem blies
6.Lateral restraint assemblies
7.Air release valve assemblies
8.Casings
9.Pipe hangers
10.Epoxy adhesives
11.Concrete pipe supports Submit the maximum range and preset dimension for each expansion assembly or seismic expansion assembly as an informational submittal. Submit at least 5 sets of product data. Each set must be bound together and include an index stating equipment names, manufacturers, and model numbers. Two sets will be returned. Notify the Engineer of the submittal. Include in the notification the date and contents of the submittal.
20-2.13C(1)(d) Quality Assurance
Reserved
20-2.13C(2) Materials
20-2.13C(2)(a) General
Reserved
20-2.13C(2)(b) Water Supply Line
Water supply lines must consist of ductile iron pipe and fittings. Pi pe must comply with ANSI/AWWA C151/A21.51 , Class 350. Fittings must co mply with ANSI/AWWA C110/A21.10 and be rated for a working pressure of 350 psi. Ductile iron pipe connections to expansion assemblies must be a flanged joint complying with ANSI/AWWA C115/A21.15 . Flange gaskets must be rated for a working pressure of 350 psi. Fasteners must comply with section 75 -2, except that stainless steel fasteners must not be used. All other ductile iron pipe and fitting joints must be push -on, restrained type compl ying with ANSI/AWWA C111/A21.11 . Push -on, restrained type joints may use proprietary dimensions and restrained joint locking systems. Ductile iron pipe and fittings must have an asphaltic coating complying with ANSI/AWWA C151/A21.51 and a cement mortar lin ing complying with ANSI/AWWA C104/A21.4.
20-2.13C(2)(c) Expansion Assemblies
Each expansion assembly must be a sleeve type expansion joint. The expansion assembly must have:
1.Ductile iron body complying with ANSI/AWWA C153/A21.53
2.Flanged ends complyi ng with ANSI/AWWA C110/A21.10
3.Fusion -bonded epoxy internal lining complying with ANSI/AWWA C213 with a minimum thickness of 15 mils
4.Internal expansion -sleeve limiting -stop collars and be pressure balanced
5.Working pressure of at least 350 psi for s izes 24 inches and smaller and 250 psi for sizes larger than 24 inches
6.NSF 61 certification The expansion assembly must be factory set at 1/2 the extension capacity.
20-2.13C(2)(d) Flange Insulating Gaskets
Each flange insulating gasket must consist of a dielectric flange gasket, insulating washers and sleeves, and commercial -quality steel bolts and nuts. Dielectric flange gasket must have a dielectric strength of at least 500 VPM.
20-2.13C(2)(e) Casing Insulators
Each casing insulator must b e: SECTION 20 LANDSCAPE
1.2-piece, 8 -inch, 14 -gauge epoxy -coated or galvanized steel band. The band must be four 2 -inch-wide glass -reinforced polyester or polyethylene runners, with hot -dip galvanized nuts and bolts.
2.Coated with at least 15 -mils of heat -fused PVC to provid e a nonconductive inner liner.
3.Factory constructed to ensure that the water supply line is centered in the casing. Insulators must not allow any pipe to casing contact and have at least 2 runners seated on the bottom of the casing.
4.Sized for the casi ng and water supply line shown.
20-2.13C(2)(f) Dirt Stops
Dirt stops must consist of a redwood cover with polyurethane foam. Redwood cover must be construction heart grade redwood complying with section 57 -2.01B(2). Construct cover to fit snugly around t he water supply line. The cover must be 2 inches taller and 2 inches wider than the casing. Polyurethane foam must be expanding foam spray that is water resistant and moisture cured.
20-2.13C(2)(g) Seismic Expansion Assemblies
Each seismic expansion assem bly must be a sleeve -type expansion joint with integral ball joints at each end. Each seismic expansion assembly must have:
1.Ability to withstand at least a 15 degree angular deflection at each end and a maximum movement in all 3 planes at the same time
2.Ductile iron body complying with ANSI/AWWA C153/A21.53
3.Flanged ends complying with ANSI/AWWA C110/A21.10
4.Fusion -bonded epoxy internal lining complying with ANSI/AWWA C213 with a minimum thickness of 15 mils
5.Internal expansion -sleeve limiting -stop collars and be pressure balanced
6.Ball joints contained in flanged retainers with seal gaskets
7.Working pressure of at least 350 psi for sizes 24 inches and smaller and 250 psi for sizes larger than 24 inches
8.NSF 61 certification The seismic expansion assembly must be factory set at 1/2 the extension capacity.
20-2.13C(2)(h) Lateral Restraint Assemblies
Each lateral restraint assembly must be:
1.Constructed from commercial -quality steel components complying with section 75 -2
2.Adjus table
3.Able to resist a horizontal force of 10 percent of the contributory dead load
20-2.13C(3) Construction
Each ductile iron pipe must be connected and fully extended (pulled out) after joint assembly before the adjacent pipe section is added. Insta ll flange insulating gaskets on the outside flange of seismic expansion assemblies and expansion assemblies.
20-2.13C(4) Payment
Not Used
20-2.14 Temporary Irrigation Systems
Reserved SECTION 20 LANDSCAPE
20-2.15 20-2.18 Reserved
20-3 Planting
20-3.01 General
20-3.01A General
20-3.01A(1) Summary
Section 20 -3.01 includes general specifications for performing planting work.
20-3.01A(2) Definitions
average plant density: Number of living plants per square yard determined from a count of sample areas selected by the Engineer representing 3 to 5 percent of the total planted area.
20-3.01A(3) Submittals
20-3.01A(3)(a) General
Submit nursery invoices showing s izes, quantities, and botanical names of plants , including genus, species, and variety. Include lot numbers for plants grown from the same seed lot or cutting source. If a root stimulant is required, submit a copy of the root stimulant manufacturer's product sheet and instructions for the application of the root stimulant. Submit a copy of the mycorrhizae manufacturer's product data sheet showing:
1.Name, address, telephone number and web address of the manufacturer
2.Date of manufactu ring
3.Species of fungi
4.Spores per gram for each species
5.Ingredients other than fungi If cuttings are to be taken from outside the right -of-way, submit proof of permits and payment of associated fees. Notify the Engineer of the location at least 15 days before taking cuttings.
20-3.01A(3)(b) Vendor Statements
At least 60 days before planting the plants, submit a statement from the vendor that the order for the plants required, including sample plants used for inspection, has been received and acc epted by the vendor. The statement from the vendor must include the plant names, sizes, quantities, and anticipated delivery date.
20-3.01A(3)(c) Certificates of Compliance
Submit a certificate of compliance for sod, soil amendment, and plant tubes.
20-3.01A(4) Quality Assurance
Plants must comply with federal and State laws requiring inspection for diseases and infestations. Inspection certificates required by law must accompany each shipment of plants. The Engineer inspects the roots of container -grown sample plants by removing earth from the root ball of not less than 2 plants, nor more than 2 percent of the total number of plants of each species or variety. If container -grown plants are purchased from several sources, the Engineer inspects the roots of not less than 2 of each sample plant species or variety from each source. The root ball of container grown plants must not show evidence of having been restricted, or being underdeveloped or deformed. If the Engineer finds noncompliant plants, the entire lot represented by the noncompliant sample plants is rejected. Cuttings with mature or brown stems and cuttings that have been trimmed will be rejected.
20-3.01B Materials
20-3.01B(1) General
Notify the Engineer at least 10 day s before the plants are shipped to the job site. SECTION 20 LANDSCAPE
20-3.01B(2) Plants
20-3.01B(2)(a) General
Plants must be true to the type or name shown. Plants must be individually tagged or tagged in groups identifying the plants by species or variety. Tagging is not required for cuttings. Plants must be healthy, well -formed, free from insect pests and disease, and grown in nurseries inspected by the Department of Food and Agriculture. Plants must not be root -bound. The plants must be the size and type shown in the following table: Plant group designation Description Container size (cu in) A No. 1 container 152–251 B No. 5 container 785–1,242 C Balled and burlapped -- E Bulb -- F In flats -- H Cutting -- I Pot -- K 24-inch box 5,775–6,861 M Linera -- O Acorn -- P Plugsa,b -- S Seedlingc -- U No. 15 container 2,768–3,696 Z Palm Tree -- aDo not use containers made of biodegradable material. bGrown in individual container cells. cBare root. Trucks used for transporting plants must be equipped with covers to protect plants from windburn and sunburn. Handle and pack plants using authorized methods appropriate for the species or variety.
20-3.01B(2)(b) Cuttings
20-3.01B(2)(b)(i) General
Cuttings must be taken from designated areas or you must make arrangements to supply cuttings. To obtain cuttings outside of project limits, but within the State right -of-way, contact the local district encroachment permit office. Take cuttings random ly from healthy, vigorous plants free of pests and disease. Make cuts with sharp , clean tools. Clean and disinfect cutting tools before taking cuttings from a different cutting source and at the end of each day . Tree branch cuttings must be harvested from various trees within a stand. Cuttings must not be harvested from more than 25 percent of an individual plant and not more than 50 percent from plants in the same area. Cuttings must be covered and the ends kept wet until planted. Cuttings that have dried out or withered must be discarded.
20-3.01B(2)(b)(ii) Carpobrotus and Delosperma Cuttings
Carpobrotus cuttings must be a minimum of 10 inches in length and not have roots . Delosperma cuttings must be a minimum of 6 inches in length and not have roots .
20-3.01B(2)(b)(iii) Willow and Cottonwood Cuttings
Willow and cottonwood cuttings must be:
1.Reasonably straight SECTION 20 LANDSCAPE
2.Cut square above a leaf bud to form the tip
3.Cut at an approximate 45-degree angle at the base below a leaf bud
4.Cut square at the top above a leaf bud
5.Trim off leaves and branches flush with the cutting stem
6.From 20 to 24 inches in length
7.From 3/4 to 1 -1/2 inches in diameter at the base of the cutting Cuttings must be harvested from dormant plants after leaf drop and before buds open in early spring. At least 50 percent of the base of the cuttings must be soaked for a minimum of 5 days, but not more than 30 days in fresh clean water to allow buds to swell prior to plant ing. Cuttings must be soaked in a shaded location until the time of planting . Cutting s that have been soaking for more than 30 days must be discarded.
20-3.01B(2)(b)(iv) 20-3.01B(2)(b)(viii) Reserved
20-3.01B(2)(c) Sod
Sod must:
1.Be grown t o comply with the Food & Agri Code
2.Be free from weeds and undesirable types of grasses and clovers
3.Be field -grown on soil containing less than 50 percent silt and clay
4.Have less than 1/2 -inch-thick thatch
5.Be from 8 to 16 months old
6.Be machin e cut to a uniform soil thickness of 5/8 ± 1/4 inch, not including top growth and thatch Protect sod with tarps or other protective covers during delivery. Do not allow sod to dry out during delivery or before placement.
20-3.01B(3) Soil Amendments
20-3.01B(3)(a) General
Soil amendment must comply with the provisions in the Food & Agri Code and as specified in the special provisions.
20-3.01B(3)(b) Reserved
20-3.01B(4) Fertilizers
20-3.01B(4)(a) General
Deliver f ertilizer in labeled containers showing weight, chemical analysis, and manufacturer's name. Fertilizer must comply with the provisions of the Food & Agri Code.
20-3.01B(4)(b) Slow -release Fertilizers
Slow -release fertilizer must be a pelleted or granular form with a nutrient release over a 3 to 4 month period and be within the chemical analysis ranges shown in the following table: Ingredient Range Nitrogen (N) ( %) 16–21 Phosphoric acid (P) ( %) 6–8 Water soluble potash (K) ( %) 4–10
20-3.01B(4)(c) Packet Fertilizers
Packet fertilizer must be a biodegradable packet with a nutrient release over a 12 -month period. Each packet must have a weight of 10 ± 1 grams and must comply with the chemical analysis requirements shown in the f ollowing table: SECTION 20 LANDSCAPE Ingredient Requirement Nitrogen (N) ( %) 20 Phosphoric acid (P) ( %) 10 Water soluble potash (K) ( %) 5
20-3.01B(4)(d) Organic Fertilizers
Organic fertilizer must be pelleted or granular with a cumulative nitrogen release rate at 86 degrees F of no more than 70 percent for the first 70 days and 100 percent at 350 days. Organic fertilizer must be within the chemical analysis ranges shown in the following table: Ingredient Range Nitrogen (N) ( %) 5–7 Phosphoric acid (P) ( %) 1–5 Water soluble potash (K) ( %) 1–10
20-3.01B(5) Root Stimulants
20-3.01B(5)(a) General
Root stimulant must be in labeled containers showing weight and manufacturer's name.
20-3.01B(5)(b) Reserved
20-3.01B(6) Plaster Sand
Backfill material for the palm tree planting holes must be 100 percent commercial -quality washed plaster sand .
20-3.01B(7) Root Barrier
Root barrier must be an injection -molded or extruded modular panel made of high -density polypropylene or polyethylene plastic. Each panel must:
1.Be at least 1/16 inch
2.Have at least 4 molded root -deflecting vertical ribs from 0.5 to 0.8 inch wide and 6 to 8 inches apart
3.Have a locking strip or an inte gral male -female sliding lock designed to resist slippage between panels
4.Be at least 2 feet wide and 2 feet deep
20-3.01B(8) Root Protectors
Each root protector must be:
1.Fabricated from 1 -inch, hexagonal pattern, 20 -gauge me sh wire
2.Closed bottom design with a height and diameter that provides a minimum of 6 inches of clearance between the root ball and the sides and bottom of the wire cylinder The wire edge at the top of the cylinder must be the manufactured finished edge , uncut and free of sharp points.
20-3.01B(9) Foliage Protectors
Each foliage protector must be:
1.Fabricated from 1 -inch, hexagonal pattern, 20 -gauge mesh wire
2.Approximately 4 feet high and 2 feet in diameter The wire edge at the top of the cylinder must be the manufactured finished edge. Other wire edges that are cut must be free of sharp points. Support stakes must be one of the following: SECTION 20 LANDSCAPE
1.3/4-inch reinforcing steel bar a minimum of 5 feet long with an orange or red pl astic safety cap that fits snugly onto the top of the reinforcing steel bar.
2.2-inch nominal diameter or 2 -by-2-inch nominal size wood stakes a minimum of 5 feet long. Wood stakes must be straight. The jute mesh cover must comply with section 21 -2.02O(2 ). The material required to hold the jute mesh cover in place must be 1/8 -inch-diameter manila hemp twine.
20-3.01B(10) Wood Plant Stakes
Each plant stake for vines must be nominal 1 by 1 inch and 18 inches long. Each plant stake for trees must be nominal 2 by 2 inches or nominal 2 inches in diameter and long enough to keep the tree in an upright position.
20-3.01B(11) Plant Ties
Each plant tie for vines must be extruded vinyl -based tape, 1 inch wide and at least 8 mils thick. Each plant tie for tr ees must be a (1) minimum 3/4 -inch-wide, UV -resistant, flexible vinyl tie complying with ASTM D412 for tensile and elongation strength, or (2) lock -stitch, woven polypropylene with a minimum 900 lb tensile strength.
20-3.01C Construction
20-3.01C(1) Gene ral
Apply a root stimulant under the manufacturer's instructions to the plants specified in the special provisions. Apply mycorrhizae inoculant under the manufacturer's instructions within 1.5 years of manufacturing date at the locations, rates, sequence, and number of applications shown. Before transporting the plants to the planting area, thoroughly wet the root ball.
20-3.01C(2) Pruning
Prune plants under ANSI A 300 part 1, Pruning published by the Tree Care Industry Association. Do not use tree seal compounds to cover pruning cuts.
20-3.01C(3) Watering
Water plants as needed to keep the plants in a healthy growing condition.
20-3.01C(4) Replacement Plants
Plants that show signs of failure to grow at any time or which are so injured or damaged as to render them unsuitable for the purpose intended, must be removed, replaced, and replanted. Replace unsuita ble plants within 2 weeks after the Engineer marks or indicates that the plants must be replaced. Replacement planting must comply with the original planting specifications, sizes and spacing described for the plants being replaced. Replacement planting fo r transplanted trees must comply with the work plan and be planted in the same planting hole. Replacement ground cover plants must be the same species specified for the ground cover being replaced. Other replacement plants must be the same species as the p lants being replaced. Place orders for replacement plants with the vendor at a time such that the replacement plants are not in a root -bound condition. The Department does not pay for replacement plants or the planting of replacement plants.
20-3.01C(5) M aintain Plants
Maintain plants from the time of planting until Contract acceptance. SECTION 20 LANDSCAPE
20-3.01D Payment
Not Used
20-3.02 Planting Work
20-3.02A General
20-3.02B Materials
Not Used
20-3.02C Construction
20-3.02C(1) General
Do not start planting until authorized . If an irrigation system is required, do not start planting in an area until the functional test has been completed and authorized for the irrig ation system serving that area.
20-3.02C(2) Preparing Planting Areas
The Engineer may designate a location other than that shown, in which case, the Engineer marks the location by a stake, flag, or other marker . Conduct work such that the existing flow line in drainage ditches is maintained. Material displaced by your activity that interferes with drainage must be removed. Where a minimum distance to a drainage ditch is shown, locate the plant such that the outer edge of its basin wall is at least the minimum distance shown for each plant involved . Excavate each planting hole by manual or machine method. The bottom of each planting hole must be flat. Do not use water to excavate the hole. Unless a larger planting hole is described, the planting hole must be large enough to receive the root ball or the total length and width of roots, backfill, amendments, and fertilizer. Where rock or other hard material prohibits the hole from b eing excavated, a new hole must be excavated and the abandoned hole backfilled.
20-3.02C(3) Planting Plants
20-3.02C(3)(a) General
Do not plant plants in soil that is too wet, too dry, not properly amended as describ ed, or in an unsatisfactory condition for planting. Do not distribute more plants than can be planted and watered on that day. Water plants immediately after planting. Apply water until the backfill soil around and below the roots or ball of earth around t he roots of each plant is thoroughly saturated. If watering with a hose, use a nozzle, water disbursement device, or pressure reducing device. Do not allow the full force of the water from the open end of the hose to fall within the basin around any plant. Groundcover plants in areas with an irrigation system must be watered by sprinklers. Several consecutive watering cycles may be necessary to thoroughly saturate the soil. If root barriers are shown, install them between trees and concrete sidewalk or curb . Install panels flush with finished grade and join with locking strips or integral male -female sliding locks. Install barriers with root deflectors facing inward. If a tree grate is shown, install the root barrier panels 0.5 inch above finish grade. Adjus t planting locations such that each tree or shrub is at least 8 feet away from any sprinkler. Where a tree, shrub, or vine is to be planted within a groundcover area or cutting planting area, plant it before planting groundcover or cuttings. SECTION 20 LANDSCAPE Where shrubs a nd groundcovers are shown to be planted in groups, the outer rows directly adjacent to the nearest roadway or highway fence must be parallel to the nearest roadway or highway fence. Stagger shrubs and groundcovers in adjacent rows. Adjust the alignment of the plants within the outer rows. The Engineer determines the size and location of sample areas used to calculate average plant density. Core holes in concrete masonry block wall where needed for vine planting. Where a vine is to be planted against a wall or fence, plant it as close as possible to the wall or fence. If a vine planted adjacent to a wall is to be staked, stake and tie the vine at the time of planting. A vine planted adjacent to a fence must be tied to the fence immediately after planting. Protect each tree trunk from injury. Do not:
1.Drag a tree
2.Use chains to move a tree
3.Lay tree on the ground Where plants are shown to be planted in RECP areas, cut the RECP to provide a planting hole with minimal damage to the RECP. Secure cuts and loose edges of the RECP with fasteners after plants have been planted. Fasteners must be steel staples complying with section 21 -2.02R. If you substitute steel staples with an alternative attachment device, submit a sample of the device at least 5 business days for approval before its installation.
20-3.02C(3)(b) Trees, Shrubs, and Vines
After preparing holes, thoroughly mix soil amendment and granular fertilizer at the rate shown with native soil to be used as backfill material. Remove containers from pla nts in a way that the ball of earth surrounding the roots is not broken. Do not cut plant containers before delivery of the plants to the planting area. Plant and water plants immediately after removal from their containers. Place packet fertilizer in the backfill within 6 to 8 inches of the ground surface and approximately 1 inch from the root ball. If more than 1 packet is required per plant, distribute the packets evenly around the root ball. Apply any root stimulant under the manufacturer's instructions . Ensure roots are not restricted or distorted. Distribute backfill uniformly throughout the entire depth of the plant hole without clods or lumps. After the planting holes have been backfilled, jet water into the backfill with a pipe or tube inserted into the bottom of the hole until the backfill material is saturated for the full depth. If the backfill material settles below this level, add additional backfill to the required level. If a plant settles deeper than shown, replant it at the required level. Remove nursery stakes after planting. Install 2 plant stakes for each plant to be staked immediately after planting. Ensure the root ball is not damaged. Spread the vine shoots and tie them with a plant tie t o each stake above the crossing point. Tie trees to the stakes with 2 tree ties, 1 tie to each stake. Each tie must form a figure eight by crossing the tie between the tree and the stake. Install ties at the lowest position that will support the tree in an upright position. Install the ties such that they provide trunk flexibility but do not allow the trunk to rub against the stakes. Wrap each end of the tie 1 -1/2 turns around the stake and securely tie or nail it to the stake. Construct a watering basin ar ound each plant. Install foliage protectors within 2 days after planting. Install the foliage protector as follows: SECTION 20 LANDSCAPE
1.Cut the bottom of the wire cylinder to match the slope of the ground and bottom of the plant basin . Remove sharp points of wire by bendin g or blunting.
2.Install support stakes for foliage protectors vertically into the soil . Space the support stakes equally around the plant and root ball.
3.Wrap wire mesh around the plant to form a cylinder. Secure the cylinder to support stakes with 16 - gauge tie wire. Verify that the cylinder is snug against the support stakes but loose enough to be raised after untying for work within the plant basin.
4.Install jute mesh cover over the foliage protector and secure with twine.
20-3.02C(3)(c) Groundcover Plants
Each groundcover planting area irrigated by a single control valve must be completely planted and watered before planting other groundcover planting areas. Plant groundcover plants in moist soil, and in neat, straight row s parallel to the nearest roadway. Stagger plants in adjacent rows. Apply fertilizer to groundcover plants and water into the soil immediately after planting.
20-3.02C(3)(d) Cuttings, Liners, Pot s, Plugs, and Seedling Plants
20-3.02C(3)(d)(i) General
Before planting, e nsure the soil is moist to a minimum depth of :
1.2 to 4 inches for Carpobrotus and Delosperma cuttings
2.6 to 8 inches for liners, plugs, and seedling plants
3.10 to 12 inches for willow and cottonwood cuttin gs and pots If shown, apply fertilizer to cuttings, liners, pots, plugs and seedling plants . Water immediately after planting. If shown, apply root stimulant before planting under the manufacturer's instructions. If shown, install foliage protectors under section 20 -3.02C(3)(b). Dispose of trimmings and unused cuttings, plugs, and seedling plants. Plant cuttings during the period specified . If cuttings, liners, pots, plugs, and seedling plants cannot be planted prior to the start of plant establishment wor k, plant them during the plant establishment period.
20-3.02C(3)(d)( ii) Carpobrotus and Delosperma Cuttings
When planting Carpobrotus and Delosperma cuttings , make sure a minimum of 2 nodes are covered with soil. Gently compact the soil around each cuttin g without damaging the cutting. The basal end of :
1.Delosperma cuttings must be at least 2 inches below the surface of the soil
2.Carpobrotus cuttings must be at least 4 inches below the surface of the soil
20-3.02C(3)(d)(ii i) Willow and Cottonwood Cuttings
Excavate planting holes for willow and cottonwood cuttings perpendicular to the ground line, or at the angle shown . Ensure planting hole excavation is large enough to receive the cuttings and fertilizer without damaging the bark. If you encounter solid rock or other unyielding material when excavating for planting holes, excavate new holes and backfill the unused holes. Plant the base of the cutting at least 10 to 12 inches deep with 3 to 5 bud scars exposed above the ground. If more tha n 5 bud scars are exposed, trim off the excess cutting length. If shown, place fertilizer in the backfill of each cutting, from 6 to 12 inches below grade and approximately 1 inch from the cutting. Backfill the plant holes with excavated material after pla nting. Distribute the excavated material evenly within the hole without clods, lumps, or air pockets. Compact the backfill so the cutting cannot be easily removed from the soil. Do not damage the cutting's bark . SECTION 20 LANDSCAPE
20-3.02C(3)(d)(iv) Reserved
20-3.02C(3)(e) Sod
After all other planting is performed, grade sod areas to drain and to a smooth and uniform surface. Fine grade and roll sod areas before placing sod. Areas adjacent to sidewalks, edging, and other paved borders and surfaced areas must be 1 inch below the finished surface elevation of the facilities, after fine grading, rolling, and settlement of the soil. Place sod such that the end of each adjacent strip is staggered a minimum of 2 feet. Place the edge and end of sod firmly against adjacent sod and a gainst sidewalks, edging, and other paved borders and surfaced areas. Lightly roll the entire sodded area to eliminate air pockets and ensure close contact with the soil after placement of the sod. Water the sodded areas such that the soil is moist to a mi nimum depth of 4 inches after rolling. Do not allow the sod to dry out. If irregular or uneven areas appear in the sodded areas, restore to a smooth and even appearance. Trim sod to a uniform edge at sidewalks, edging, and other paved borders and surfaced areas. Trimming must be repeated whenever the edge of sod extends 1 inch or more beyond the edge of the edging, sidewalks, and other paved borders and surfaced areas. Remove trimmed sod. Mow sod when it has reached a height of 4 inches. Mow sod to a height of 2.5 inches.
20-3.02D Payment
The payment quantity for soil amendment is the volume measured in the vehicle at the point of delivery. The payment quantity for slow -release fertilizer, organic fertilizer, or iron sulfate (lb) is the weight determined from the marked weight or sack count. The payment quantity for plants is measured by either the product of the average plant density and the total planted area, or by a count of the living plants in place.
20-3.03 20-3.07 Reserved
20-4 Plant Estab Lishment Work
20-4.01 General
20-4.01A Summary
Section 20 -4 includes specifications for performing plant establishment work . Plant establishment consists of caring for the plants , including:
1.Controlling plant growth
2.Fertilizing
3.Controlling weeds and pests
4.Replacing damaged plants
5.Watering
6.Operating irrigation system
7.Repairing new irrigation system Working days on which no work is required are credited as plan t establishment working days regardless of whether or not you perform plant establishment work. If any component of the electric automatic irrigation system is operated manually, the day will not be credited as a plant establishment working day unless the manual operation is authorized. Working days on which you fail to adequately perform plant establishment work are not credited as plant establishment working days. SECTION 20 LANDSCAPE
20-4.01B Definitions
Type 1 plant establishment: Plant establishment period with the number of working days specified for plant establishment starting after all work has been completed, except for plant establishment work, and other bid items specified to be performed until Contract acceptance. Type 2 plant establishment: Plant establishment period with the number of working days specified for plant establishment starting after all planting work has been completed, except for plant establishment work, and other bid items specified to be performed until Contract acceptance. The Department will not accept the Contract unless the plant establishment work has been satisfactorily performed for at least the number of working days specified for plant establishment. If maintenance and protection relief is granted for a portion of the work, Type 2 plant establishment period for that portion is the time between completion of all planting work, except for plant establishment work, and the granting of maintenance and protection relief. The Department will not grant relief unless the pl ant establishment work in the completed portion of the work has been satisfactorily performed for at least the number of working days specified for the plant establishment period.
20-4.01C Submittals
20-4.01C(1) General
Submit seasonal watering schedules for use during the plant establishment period within 10 days after the start of the plant establishment period. Remote irrigation control system watering schedule must use the remote irrigation control system software program. Submit updated watering sche dules within 5 business days after any changes have been made to the authorized schedules. Submit a revised watering schedule for each irrigation controller at least 30 days before completion of the plant establishment period.
20-4.01C(2) Notification
The Engineer notifies you when the plant establishment period starts and furnishes statements regarding the number of working days credited to the plant establishment period after the notification. Notify the Engineer at least 5 business days before applying each application of fertilizer.
20-4.01D Quality Assurance
Provide training by a qualified person on the use and adjustment of the installed irrigation controllers no more than 30 days before completion of the plant establishment period. Perform a final i nspection of the plant establishment work in the presence of the Engineer 20 to 30 days before Contract acceptance.
20-4.02 Materials
Fertilizer must comply with section 20 -3.01B(4).
20-4.03 Construction
20-4.03A General
Dispose of surplus earth accumul ated in roadside clearing and planting areas. Remove the tops of foliage protectors if plants become restricted. Remove foliage protectors, including support stakes, within 30 days before the completion of the plant establishment period. Keep plant basin w alls well formed. Clean new wye strainers and existing wye strainers that are a part of the new irrigation system annually until the completion of the plant establishment period. The last cleaning must be done within 15 days before the completion of the pl ant establishment period. SECTION 20 LANDSCAPE Remove, clean, and reinstall new filters and existing filters that are a part of the new irrigation system annually until the completion of the plant establishment period. The last cleaning must be done within 15 days before the c ompletion of the plant establishment period.
20-4.03B Plant Growth Control
Trim and mow turf areas as specified for sod in section 20 -3.02C(3)(e). Dispose of trimmed and mowed material. If irregular or uneven areas appear within turf areas, restore to a s mooth and even appearance. Reseed turf seed areas. Prune plants planted as part of the Contract as authorized. Remove plant growth that extends within 2 feet of sidewalks, curbs, dikes, shoulders, walls or fences. Remove new and existing ground cover from within the plant basins, including basin walls, turf areas, and planting areas within edging. Vines adjacent to walls and fences must be kept staked and tied. Train vines on fences and walls or through cored holes in walls.
20-4.03C Fertilizing
Apply fertilizer to the plants as described and water into the soil after each application. Apply fertilizer with a mechanical spreader, whenever possible.
20-4.03D Weed Control
Control weeds under section 20 -1.03C(3).
20-4.03E Plant Staking
Replace plant sta kes that are inadequate to support plants with larger stakes. Remove plant stakes when the Engineer determines they are no longer needed.
20-4.03F Replacement Plants
Replacement plants must comply with section 20 -3.01C(4). Replacement of plants up to and including the 125th plant establishment working day must be with a plant of the same size as originally specified. Plants of a larger container size than those originally specified for replacement plants may be used during the first 125 working days of the plant establishment period. Plants replaced after the 125th plant establishment working day must be the size shown in the following table: Plant size (Original) Plant size (Replacement) Pot/liner/plug/seedling No. 1 container No. 1 container No. 5 container No. 5 container No. 15 container Other replacement plants must be the same size as originally specified. Replacement ground cover plants must have the spacing shown in the following table: SECTION 20 LANDSCAPE Original spacing (inches) On center spacing of replacement ground cover plants (inches) Number of completed plant establishment working days 1–125 126–190 191–End of plant establishment period 9 9 6 6 12 12 9 6 18 18 12 9 24 24 18 12 36 36 24 18
20-4.03G Watering
Operate the electric irrigation systems utilizing external weather, learned flow, and other system data inputs required to operate the system in the automatic mode, unless otherwise authorized. Water plants utilizing the remote irrigation control system software progr am unless authorized.
20-4.04 Payment
Not Used
20-5 Landscape Elements
20-5.01 General
20-5.01A General
Section 20 -5.01 includes general specifications for constructing and installing landscape elements . Earthwork must comply with section 19.
20-5.01B Materials
Not Used
20-5.01C Construction
Not Used
20-5.01D Payment
Not Used
20-5.02 Edging
20-5.02A General
Section 20 -5.02 includes specifications for constructing landscape edging .
20-5.02B Materials
20-5.02B(1) General
Reserved
20-5.02B(2) Header Board Edging
Lumber for header board edging must be one of the following types:
1.Construction grade cedar
2.Pressure -treated Do uglas fir
3.Construction heart grade redwood complying with section 57 -2.01B(2) Lumber must be:
1.Rough cut from sound timber.
2.Straight. Sweep must not exceed 1 inch in 6 feet.
3.Free from loose or unsound knots. Knots must be sound, tight, well spaced, and not to exceed 2 inches in size on any face.
4.Free of shakes in excess of 1/3 the thickness of the lumber.
5.Free of splits longer than the thickness of the lumber.
6.Free of other defects that would render the lumber unfit structurally for the purpose intended. SECTION 20 LANDSCAPE
20-5.02B(3) Metal Edging
Metal edging must be commercial quality, made of aluminum or steel, and have an L -shaped design. Edging must be at least 4 inches in height. The thickness must be as recommended by the manufacturer for the u se intended. Edging anchors must be from the same manufacturer as the metal edging.
20-5.02B(4) HDPE Edging
HDPE edging must be commercial quality and a minimum of 4 inches in height. The thickness must be as recommended by the manufacturer for commercial installation for the use intended. Edging anchors must be from the same manufacturer as the HDPE edging.
20-5.02B(5) Concrete Edging
Concrete for edging must be minor concrete.
20-5.02B(6) 20-5.02B(10) Reserved
20-5.02C Construction
20-5.02C(1) Genera l
Where edging is used to delineate the limits of inert ground cover or wood mulch areas, install the edging before installing the inert ground cover or wood mulch. Saw cut surfaces where (1) asphalt concrete or concrete surfacing must be removed to allow the installation of edging and (2) no joint exists between the surfacing to be removed and the surfacing to remain in place. The surfacing must be cut in a straight line to a minimum depth of 2 inches with a power - driven saw before the surfacing is removed . Spike or stake spacing must comply with the manufacturer's instructions for use and job site conditions.
20-5.02C(2) Header Board Edging
Each stake must be driven flush with the top edge of the header board edging and the stake top must be beveled away from the header board at a 45 degree angle. Attach stake to header board with at least two 12-penny , hot-dipped galvanized nails per stake.
20-5.02C(3) Metal and HDPE Edging
Spike or stake spacing for metal and HDPE edging must comply with the manufacturer's instructions for use and job site conditions.
20-5.02C(4) Concrete Edging
Construct and finish minor concrete edging under section 73 -2.
20-5.02C(5) 20-5.02C(9) Reserved
20-5.02D Payment
The payment quantity for edging is the length measu red parallel to the ground surface.
20-5.03 Inert Ground Covers
20-5.03A General
20-5.03A(1) General
20-5.03A(1)(a) Summary
Section 20 -5.03A includes general specifications for placing inert ground covers .
20-5.03A(1)(b) Definitions
Reserved
20-5.03A(1)(c) Submittals
For filter fabric submit:
1.Product data including the manufacturer's product sheet and installation instructions SECTION 20 LANDSCAPE
2.Certificate of compliance at least 5 business days before delivery of the material to the job site
20-5.03A(1)(d) Quality Assurance
Reserved
20-5.03A(2) Materials
Preemergent must be granular. Filter fabric must be Class A and comply with section 96 -1.02B . Staples for filter fabric must comply wit h section 21 -2.02R.
20-5.03A(3) Construction
20-5.03A(3)(a) General
Before installing inert ground cover, remove plants and weeds to the ground level.
20-5.03A(3)(b) Earthwork
Excavate to the depth shown. Maintain the planned flow lines, slope gradients, and contours of the job site. Grade subgrade to a smooth and uniform surface and compact to at least 90 percent relative compaction.
20-5.03A(3)(c) Treatment of Soil
After compaction, apply preemergent at the maximum label rate. Do not apply pr eemergent more than 12 inches beyond the inert ground cover limits. Complete the preemergent application and inert ground cover placement within the same day.
20-5.03A(3)(d) Filter Fabric
Immediately before placing filter fabric, the surfaces to receive f ilter fabric must be free of loose or extraneous material and sharp objects that may damage the filter fabric during installation. Align fabric and place in a wrinkle -free manner. Overlap adjacent rolls of the fabric from 12 to 18 inches. Spread each overl apping roll in the same direction. Fasten fabric with staples flush with the adjacent fabric to prevent movement of fabric by placement of inert ground cover. Repair or replace fabric damaged during placement of inert ground cover with sufficient fabric to comply with overlap specifications.
20-5.03A(4) Payment
Not Used
20-5.03B Rock Blanket
20-5.03B(1) General
20-5.03B(1)(a) Summary
20-5.03B(1)(b) Definitions
Reserved
20-5.03B(1)(c) Submittals
Submit a 1 sq yd sample including rock of various sizes , and when required, rock of various colors . The sample must include the rock source location.
20-5.03B(1)(d) Quality Assurance
Reserved
20-5.03B(2) Materials
20-5.03B(2)(a) General
Do not use filter fabric. SECTION 20 LANDSCAPE
20-5.03B(2)(b) Concrete
Concrete must be minor concrete. Aggregate size must be from 3/8 to 3/4 inch.
20-5.03B(2)(c) Rock
Rock must be clean, smooth, obtained from a single source, and must comply with the following gradation requirements: Gradation Requirements Screen size (inch) Percentage passing 8 100 6 50−85 4 0−50 You may use rock with superficial chipping or jagged edges if the rock is placed such that the chipped areas and jagged edges are submerged in the concrete.
20-5.03B(2)(d) Mortar
Mortar must comply with section 51 -1.02F.
20-5.03B(3) Construction
Rock must be placed while concrete is still plastic. Remove concrete or mortar adhering to the expo sed surfaces of the rock including any residual haze from concrete or mortar . Protect rocks from staining during the mortar process. Rock that is exposed on the finished surface must be round, smooth, clean and without jagged edges or chipped areas showing . Loose rocks or rocks with a gap greater than 3/8 inch must be reset by an authorized method. The rock gap is measured from the edge of the rock to the surrounding concrete bedding. If you are ordered to remove existing concrete below ground within the limits of the rock blanket, saw cut the concrete before removal. This work is change order work.
20-5.03B(4) Payment
The payment quantity for rock blanket is the area measured parallel to the surface of the rock blanket.
20-5.03C Gravel Mulch
20-5.03C(1) General
20-5.03C(1)(a) Summary
20-5.03C(1)(b) Definitions
Reserved
20-5.03C(1)(c) Submittals
Submit a 5 lb sample of the gr avel mulch.
20-5.03C(1)(d) Quality Assurance
Reserved
20-5.03C(2) Materials
Gravel mulch must be:
1.Uniform gray color
2.From only 1 source
3.Crushed rock that complies with the gradation requirements shown in the following table: SECTION 20 LANDSCAPE Gradation Requireme nts Sieve size Percentage passing 1-1/4" 100 3/4" 60–80 1/2" 45–65 No. 40 5–20
20-5.03C(3) Construction
Place gravel and compact. The finished gravel mulch surface must be smooth , uniform and maintain the original flow lines, slope gradients, and contours of the job site.
20-5.03C(4) Payment
The payment quantity for gravel mulch is the area measured parallel to the surface of the gravel mulch.
20-5.03D Decomposed Granite
20-5.03D(1) Gen eral
20-5.03D(1)(a) Summary
Section 20 -5.03D includes specifications for placing decomposed granite .
20-5.03D(1)(b) Definitions
Reserved
20-5.03D(1)(c) Submittals
Five business day s before delivery of the materials to the job site, submit:
1.Solidifying emulsion product data including the manufacturers' product sheets and installation instructions
2.Certificate of compliance for solidifying emulsion
3.5 lb sample of the decomposed granite
20-5.03D(1)(d) Quality Assurance
A test plot must be:
1.Constructed at an authorized location
2.At least 3 by 12 feet
3.Constructed using the materials, equipment, and methods to be used in the work
4.Authorized before starting dec omposed granite work Notify the Engineer at least 7 days before constructing the test plot. The Engineer uses the authorized test plot to determine acceptability of the work. If ordered, prepare additional test plots. Preparing additional test plots is ch ange order work. The Engineer may order you to remove any test plot not incorporated into the work.
20-5.03D(2) Materials
20-5.03D(2)(a) General
Decomposed granite must be:
1.Uniform gray or tan color
2.From only 1 source
3.Crushed granite rock that c omplies with the gradation requirements shown in the following table: SECTION 20 LANDSCAPE Gradation Requirements Sieve size Percentage passing 3/8" 100 No. 4 95–100 No. 8 75–80 No. 16 55–65 No. 30 40–50 No. 50 25–35 No. 100 20–25 No. 200 5–15 NOTE: G radation is based on AASHTO T 11 and T 27 .
20-5.03D(2)(b) Solidifying Emulsion
Solidifying emulsion must be either a water -based polymer or nontoxic organic powdered binder specifically manufactured to harden decomposed granite. The solidifying emulsion must not change the decomposed granite color.
20-5.03D(3) Construction
Do not place decomposed granite during rainy conditions. Mix solidifying emulsion thoroughly and uniformly throughout the decomposed granite and under the manufact urer's instructions. Mix the material in the field using portable mixing equipment or have it delivered in mixer trucks from a local ready -mixed plant. Place decomposed granite uniformly in layers no more than 1 -1/2 inches thick. Compact each layer of deco mposed granite to a relative compaction of not less than 90 percent. Start compaction at least 6 hours but no more than 48 hours after placement. For field -mixed material, apply a solidifying emulsion after compaction as recommended by the manufacturer. Pr event runoff or overspray of solidifying emulsion onto adjacent paved or planting areas. The finished decomposed granite surface must be smooth, uniform, and compacted to a relative compaction of not less than 90 percent. The finished surface must maintain the original flow lines, slope gradients, and contours of the job site.
20-5.03D(4) Payment
Not Used
20-5.03E Rock Mulch
Reserved
20-5.03F 20-5.03J Reserved
20-5.04 Wood Mulch
20-5.04A General
20-5.04A(1) Summary
20-5.04A(2) Definitions
Reserved
20-5.04A(3) Submittals
Submit a certificate of compliance for wood mulch. Submit a 2 cu ft mulch sample with the mulch source shown on the bag. Obtain authorization before delivering the mulch to the job site.
20-5.04A(4) Quality Assurance
Reserved SECTION 20 LANDSCAPE
20-5.04B Materials
20-5.04B(1) General
Mulch must not contain more than 0.1 percent of deleterious materials such as rocks, glass, plastics, metals, clods, weeds, weed seeds, coarse objects, sticks larger than the specified particle size, salts, paint, petroleum products, pesticides or chemical residues harmful to plant or animal life.
20-5.04B(2) Tree Bark Mulch
Tree bark mulch must be derived from cedar, Douglas fir, or redwood spe cies. The mulch must be ground such that at least 95 percent of the material by volume is less than 2 inches long in any di mension and no more than 30 percent by volume is less than 1 inch long in any di mension .
20-5.04B(3) Wood Chip Mulch
Wood chip mulch must:
1.Be derived from clean wood
2.Not contain leaves or small twigs
3.Contain at least 95 percent by volume of wood chips with a width and thickness from 1/16 to 3/8 inch and a length from 1/2 to 3 inches
20-5.04B(4) Shredded Bark Mulch
Shredded b ark mulch must:
1.Be derived from trees
2.Be a blend of loose, long, thin wood, or bark pieces
3.Contain at least 95 percent by volume of wood strands with a width and thickness from 1/8 to 1 -1/2 inches and a length from 2 to 8 inches
20-5.04B(5) Tree Trimming Mulch
Tree trimming mulch must:
1.Be derived from chipped trees and may contain leaves and small twigs
2.Contain at least 95 percent by volume of material less than 3 inches long for any dimension and no t more than 30 percent by volume of mater ial less than 1 inch long for any dimension
20-5.04B(6) Pine Needle Mulch
Pine needle mulch must:
1.Be derived from pine needles
2.Be a blend of pine needles and not more than 25 percent by volume of bark, cones and small twigs
3.Contain at least 95 percent by volume pine needles from 4 to 12 inches in length
4.Not be crushed
20-5.04B(7) 20-5.04B(11) Reserved
20-5.04C Construction
Before placing wood mulch, remove plants and weeds to the ground level. Maintain the planned flow lines, slope gradients, and contours of the job site. Grade the subgrade to a smooth and uniform surface. Place mulch after the plants have been planted. Place mulch in the plant basin at the rate described. Mulch must not come in contact with the plant crown and stem. Place mulch as shown in areas outside of plant basins to a uniform thickness. Spread mulch from the outside edge of the plant basin to the adjacent edges of shoulders, paving, retaining walls, dikes, edging, curbs, sidewalks, walls, fences, and existing p lantings. If the plant is 12 feet SECTION 20 LANDSCAPE or more from the adjacent edges of any of these elements, spread the mulch 6 feet beyond the outside edge o f the plant basin. Place pine needle mulch uniformly without clumping. Do not place mulch within 4 feet of:
1.Flow line of earthen drainage ditches
2.Edge of paved ditches
3.Drainage flow lines
20-5.04D Payment
The payment quantity for wood mulch is the volume measured in the vehicle at the point of delivery.
20-5.05 Site Furnishings
20-5.05A General
Section 20 -5.05 includes specifications for installing site furnishings .
20-5.05B Materials
Not Used
20-5.05C Construction
Not Used
20-5.05D Payment
Not Used
20-5.05E 20-5.05Z Reserve d
20-5.06 20-5.10 Reserved
20-6 20-9 Reserved
20-10 Existing Landscape
20-10.01 General
20-10.01A General
Section 20-10.01 includes general specifications for performing work on existing planting and irrigation facilities .
20-10.01B Materials
Not Used
20-10.01C Construction
Transplant any plant to be transplanted and protect any irrigation component to be relocated before performing any other construction a ctivity in the area.
20-10.01D Payment
Not Used
20-10.02 Existing Irrigation Facilities
20-10.02A General
20-10.02A(1) Summary
Section 20-10.02 includes specifications for performing work on existing irrigation facilities. Work performed on existing irr igation facilities must comply with section 20-2.
20-10.02A(2) Definitions
Reserved
20-10.02A(3) Submittals
Submit a list of irrigation system deficiencies within 7 days of checking the existing facilities. SECTION 20 LANDSCAPE
20-10.02A(4) Quality Assurance
After irrigatio n facilities have been relocated, demonstrate in the presence of the Engineer that the relocated facilities function properly. Certify each existing backflow preventer under section 20 -2.02A(4).
20-10.02B Materials
Valve box covers must be the same size as the covers they replace. Control and neutral conductors must be the same size and color as the control and neutral conductors they replace.
20-10.02C Construction
20-10.02C(1) General
Notify the Engineer at least 4 business days before shutting off the water supply to any portion of the existing irrigation system and immediately after restoring the water supply to any portion of the existing irrigation system. If an irrigation facility to be relocated is deter mined unsuitable , replace the irrigation facility under section
20-2 The replacement of the unsuitable facility is change order work.
20-10.02C(2) Check and Test Existing Irrigation Facilities
Before performing irrigation system work, check existing irrigation facilities to remain in place or to be relocated. The Engineer determines the test watering cycle lengths. Check for deficiencies including missing parts, damaged components, and improper operation. Correct deficiencies as ordered. The correction of deficiencies is change order work.
20-10.02C(3) Operate Existing Irrigation Facilities
If the Contract includes a bid item for operate existing irrigation facilities, after performing work under section 20 -10.02C(2), operate existing irrigation facilities through Contract acceptance. The following existing irrigation facilities are excluded from operate existing irrigation fa cilities work:
1.Water meters
2.Underground supply lines
3.Control and neutral conductors
4.Irrigation and electrical conduits Check for proper operation at least once every 30 days. Adjust, repair, or replace existing irrigation facilities within 7 d ays of finding any deficiency. Operate irrigation systems using the automatic irrigation controller until Contract acceptance. You may operate irrigation controllers manually during plant replacement, fertilization, weed germination, and repair work. Progr am the irrigation controllers for seasonal requirements.
20-10.02C(4) Remove Irrigation Facilities
Irrigation facilities to be removed that are more than 6 inc hes below the finished grade may be abandoned in place unless salvaging is specified or shown. Immediately after disconnecting an existing irrigation facility to be removed or abandoned from an existing facility to remain, the remaining facility must be ca pped or plugged, or connected to a new or existing irrigation facility.
20-10.02C(5) Replace Valve Box Covers
Existing valve box covers shown to be replaced must remain in place until the new covers are ready to be installed.
20-10.02C(6) Relocate Backfl ow Preventer Assemblies
Install backflow preventer assemblies under section 20 -2.02C. SECTION 20 LANDSCAPE
20-10.02C(7) Relocate Water Meters
Relocate water meters.
20-10.02C(8) Relocate Irrigation Controllers
Install irrigation controllers under section 20 -2.06C.
20-10.02C(9) Salvage Irrigation Facilities
Salvage irrigation facilities under section 15 -1.03C.
20-10.02D Payment
Not Used
20-10.03 Existing Planting
20-10.03A General
20-10.03A(1) Summary
Section 20-10.03 includes specifications for performing work on existing planted areas. Transplant palm trees between March 15 and October 15.
20-10.03A(2) Definitions
Reserved
20-10.03A(3) Submittals
Submit a work plan for:
1.Transplanting trees. The work plan must include methods of lifting, transporting, storing, planting, guying, watering and maintaining each tree to be transplanted. Include the root ball size, method of root ball containment, and a maintenance program for each tree.
2.Maintain existing planted areas. Th e work plan must include controlling the weeds, fertilizing, mowing and trimming of turf areas, watering, and controlling pests. Submit a copy of the manufacturer's product sheet for root stimulant including application instructions.
20-10.03A(4) Quality Assurance
Inspect for deficiencies of existing planted areas in the presence of the Engineer. Complete the inspection within 15 days of the start of job site activities. Deficiencies requiring corrective action include:
1.Weeds
2.Dead, diseased, or unhe althy plants
3.Plant stakes and tree ties that are missing
4.Inadequate plant basins and basin mulch
5.Other deficiencies needing corrective action to promote healthy plant life
6.Pests
20-10.03B Materials
Not Used
20-10.03C Construction
20-10.03C(1) General
Correct deficiencies of the existing planted areas if ordered within 15 days of the order. Correction of deficiencies is change order work.
20-10.03C(2) Prune Existing Plants
If a bid item for prune existing plants is not shown on the Bid Item List, prune existing plants under section
20-3.01C(2) if ordered. Pruning existing plants is change order work.
SECTION 20 LANDSCAPE
20-10.03C(3) Transplant Trees
Prune under section 20 -3.01C(2) each tree to be transplanted immediately before lifting. Prune a palm tree by removing dead fronds and frond stubs from the trunk. Remove green fronds up to 2 rows of fronds away from the center of growth. Tie the remaining 2 rows of fronds in an uprigh t position with light hemp or manila rope. Remove fronds and frond stubs at the trunk in a way that will not injure the trunk. Remove fronds and frond stubs for Phoenix dactylifera approximately 4 inches from the trunk. Prepare each hole in the new locatio n before lifting the tree to be transplanted. Lift each tree to be transplanted as described in the work plan. Handle and plant each tree to be transplanted under section 20 -3.02C(3). Until a tree is replanted, cover exposed root ball with wet burlap or ca nvas and cover the crown with 90 percent shade cloth. Replant each tree on the same day it is lifted if possible. If the transplant location is not ready to receive the tree, store and maintain the tree to be transplanted until the transplant location is a uthorized. Store the tree in an upright position. Replace each damaged transplanted tree under section 20 -3.01C(4) with the number of trees specified in the special provisions. The replacement trees must be planted in individual plant holes at the location determined by the Engineer within the area of the tree being replaced. Plant replacement trees under section 20 -3.02C. Water transplanted trees immediately after planting and as needed to keep it in a healthy growing condition until contract acceptance.
20-10.03C(4) Maintain Existing Planted Areas
Section 20 -10.03C(4) applies if a bid item for maintain existing planted areas is shown on the Bid Item List. After deficiencies are corrected, perform work to maintain existi ng planted areas in a neat and presentable condition and to promote healthy plant growth through Contract acceptance. Existing plant basins must be kept well -formed and free of sediment. If the existing plant basins need repairs and the basins contain mulc h, replace the mulch after the repairs are done. Control weeds within the existing planted area and:
1.From the existing planted area limit to the adjacent edges of paving and fences if less than or equal to 12 feet
2.From the existing planted area limit to 6 feet beyond the outer limit of the existing planted area if the adjacent edge of paving or fence is more than 12 feet away
3.Within a 3 -foot radius from each existing tree and shrub If a bid item for maintain existing planted areas is not show n on the Bid Item List, maintain existing planted areas if ordered. Maintain existing planted areas is change order work. Water existing plants as needed to keep them in a healthy growing condition until contract acceptance.
20-10.03D Payment
Not Used
20-10.04 20-10.08 Reserved
Source: California Standard Specifications, 2024 Edition. Pages 323–374 of 1,372.