**November 21, 1997**

**Contract \# TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 02810-S**

**[UNDERGROUND IRRIGATION SYSTEM]{.underline}**

[PART 1 - GENERAL]{.underline} Page

1.01 Description of Work 2

1.02 References 2

1.03 Quality Assurance 2

1.04 Submittal 3

1.05 Delivery, Storage, and Handling 3

1.06 Job Conditions
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1.07 Warranty
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1.08 Maintenance
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[PART 2 - PRODUCTS]{.underline}

2.01 Acceptable Manufacturers
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2.02 Materials
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[PART 3 - EXECUTION]{.underline}

3.01 System Design
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3.02 Examination
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3.03 Preparation
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3.04 Installation
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3.05 Field Quality Control
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3.06 Backfilling
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3.07 Coverage and Adjustment
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**SPECIAL SPECIFICATION**

**SECTION 02810**

**[UNDERGROUND IRRIGATION SYSTEM]{.underline}**

[PART 1 - GENERAL]{.underline}

1.01 [DESCRIPTION OF WORK]{.underline}

> A. Extent of underground irrigation system is shown on drawings and
> schedules.
>
> B. Related Sections: The following sections contain requirements that
> relate to this Section.
>
> 1\. Plant materials, topsoil, and landscape work are specified in
> Division 2 Section, \"Trees, Shrubs, and Ground Covers\".
>
> 2\. Water distribution is specified in Division 2 Section, \"Exterior
> Water Distribution\" except as noted herein.
>
> 3\. Excavation and filling required for irrigation system installation
> are specified in Division 2 Section, \"Earthwork\".
>
> 4\. Electrical service for the automatic control system is specified
> in Division 16 sections.

1.02 [REFERENCES]{.underline}

> A. The following publications are referenced in this Section:
>
> 1\. American Society of Testing and Material (ASTM): various tests and
> specifications as indicated.
>
> 2\. National Electric Code.
>
> 3\. Uniform Plumbing Code.
>
> 4\. National Sanitation Foundation.

1.03 [QUALITY ASSURANCE]{.underline}

> A. Installer Qualifications: Licensed landscaping contracting firm
> with not less than 5 years experience in the type and scale of work
> required in this Section.
>
> B. Manufacturer Qualifications: Provide underground irrigation system
> as a complete unit produced by acceptable manufacturers, including
> heads, valves, piping circuits, controls, and accessories.

1.04 [SUBMITTALS]{.underline}

> A. Material Product Data Sheets: Submit material product data sheets
> for valve boxes, backflow preventers, manual valves, automatic valves,
> heads, nozzles, bubblers, and automatic drain valves.
>
> B. Operation and Maintenance Manual: Submit an Operation and
> Maintenance Manual for the irrigation system prior to final
> acceptance. Include a table of contents of material and copies of
> material product data sheets. Cross out irrelevant information.
> Include exploded drawings of equipment components where available,
> source of materials, copies of contractor and material vendor business
> cards, copy of controller manual and diagrams, and a schedule of
> suggested watering times by month for each station for the first year
> of operation. Provide materials in three-hole punched format, ready
> for insertion into a three-ring binder. Review operation and
> maintenance with the SDR and staff prior to final acceptance. Type or
> clearly print written information.
>
> C. Record Drawings: On a SDR-furnished print of the irrigation plan,
> clearly mark the exact arrangement of the system, including the
> arrangement and sizes of all valves and main lines, intermittent
> pressure lines, splices, control wires, and lines under paved
> surfaces. Locate features of the irrigation system using a system of
> specific measurements from easily identified, permanent features such
> as buildings, roads, and walks. As work progresses, note on the plans
> in red pencil any variations in work noted. Maintain and store record
> drawings on-site at all times. No inspections will be conducted or
> approvals granted if record drawings are not on-site or current.
> Provide record drawings to the SDR for approval prior to final
> acceptance.
>
> D. Controller Diagrams: Prepare a waterproof, color-coded diagram for
> each controller keying station of the controller to valve zones. Mount
> diagram inside the automatic controller door. Provide one copy of each
> diagram in the Operation and Maintenance Manual.
>
> E. Submit all of the above in accordance with Provisions of section
> 1300, "Descriptive Submittals".

1.05 [DELIVERY, STORAGE, AND HANDLING]{.underline}

> A. Delivery and Storage: Coordinate delivery and on-site storage
> location with the SDR. Do not store PVC pipes in direct sunlight.
>
> B. Product Handling: Follow manufacturer\'s recommended procedures for
> loading, unloading, stacking, transporting and handling materials and
> equipment.

1.06 [JOB CONDITIONS]{.underline}

> A. Existing Conditions:
>
> 1\. Utilities: Verify the locations and sizes of stubouts for water
> sources indicated on drawings as the source of water supply to the
> underground irrigation system. Prior to excavation, determine the
> locations of all newly constructed and existing cables, conduits,
> sewers, water lines, and other underground utilities. Do not damage or
> disturb underground utilities. If a conflict exists between the
> location of underground utilities and the proposed work, notify the
> SDR in writing and arrange for relocations. Proceed in the above
> manner if a rock layer or other unanticipated conditions are
> encountered underground. Repair utility damage as directed by the SDR.
>
> 2\. Digging Permit: Contact SDR for Digging Permit requirements.
>
> 3\. Construction: Use extreme caution when working near existing
> construction. Do not damage existing features not specifically
> indicated to be removed. Repair any accidental damage as directed by
> the SDR.
>
> B. Sequencing/Scheduling: Coordinate irrigation system with related
> work. Grade site within 1 inch of finish grade prior to trenching.
> Install irrigation system prior to plant installation.

1.07 [WARRANTY]{.underline}

> A. General: Warranty underground irrigation system through the
> specified warranty period against operational deficiencies due to
> inferior material or workmanship. Correct deficiencies immediately as
> directed by the SDR at no additional cost to SNL, including damage
> caused by such defects.
>
> B. Settlement: Warranty underground irrigation system through the
> specified warranty period against settlement damage. Adjust, restore,
> or replace pipes, valves, sprinkler heads, planting, paving, or other
> improvements at no additional cost to SNL.

1.08 [MAINTENANCE]{.underline}

> A. Extra Materials: Provide four extra pop-up heads and four extra
> nozzles of each type indicated and two sets of special wrenches for
> each type of head or nozzle. Provide wrenches from the same
> manufacturer as heads and nozzles, designed for installing, removing,
> and adjusting heads and nozzles.

[PART 2 - PRODUCTS]{.underline}

2.01 [ACCEPTABLE MANUFACTURERS]{.underline}

A. Manufacturer: Subject to compliance with requirements, provide
products as scheduled or specified in this Section. Substitutions are
allowed only under provisions of section 1600.

2.02 [MATERIALS]{.underline}

> A. Pipe and Pipe Fittings:
>
> 1\. Pipe:
>
> a\. Pressure Pipe: Provide pipe in accordance with Division 2 Section,
> \"Exterior Water Distribution\" or provide Schedule 40 PVC pipe
> meeting requirements below.
>
> b\. Master Lines and Intermittent Pressure Laterals: Schedule 40 PVC
> pipe, continuously marked with identification of the manufacturer,
> type, class, and size, complying with ASTM D 1785 for Schedule 40 pipe
> and ASTM D 1784 for PVC compounds. Provide pipe in 20-foot lengths,
> free of holes, foreign material, blisters, wrinkles or dents.
>
> 2\. PVC Fittings: Schedule 40 PVC socket fitting, Type 1, Cell
> Classification 12454-B, complying with ASTM D 2466, D 2467, and D
> 1784.
>
> 3\. Threaded Nipples: Schedule 80 PVC pipe.
>
> 4\. Risers: Schedule 40 galvanized steel pipe, unless otherwise
> indicated.
>
> 5\. Cleaner, Primer, and Solvent Cements:
>
> a\. Cleaner: Uni-Weld 7300 cleaner or approved substitute.
>
> b\. Primer: Uni-Weld 8700 Hi-Etch purple primer, ASTM F656, or an
> approved substitute.
>
> c\. Solvent Cements: Uni-Weld 2200 clear, light viscosity type, for
> lateral lines, Uni-Weld 1700 gray, heavy duty viscosity type, for
> lateral lines larger than 2-1/2\" diameter, and Uni-Weld 6700 for
> clear, light viscosity type for Flex/PVC connections or approved
> substitute.
>
> 6\. Sealing Tapes and Pastes:
>
> a\. Threaded Connections between PVC and Metal Pipe: Rectorseal No.
> 100 virgin heavy duty sealing paste, Plastojoint Stick as manufactured
> by Lake Chemical Company, or Teflon tape.
>
> b\. Metal to Metal Connection: Rectorseal No. 5 slow dry, soft set
> pipe thread compound.
>
> c\. PVC to PVC Connections: Teflon tape.
>
> d\. Plastic Irrigation Head or Plastic Valve to Pipe Connections:
> Teflon tape.
>
> 7\. Pipe Lubricant: As provided by pipe manufacturer for \"O\" ring
> gasket and pipe spigot ends. If not provided, use I.P.S. Weld- On No.
> 787 gasket lubricant as manufactured by Industrial Polychemical
> Service.
>
> 8\. Flexible Nipples: Cobra Connector, U.S. Patent #s 5,039,011 &
> 5,221,114, with 1/2\" Nominal I.P.S. heavy wall flexible hose, as
> manufactured by F. P. Parker Manufacturing Co. Inc., 230-A Coney
> Island Dr., Sparks, Nevada, 89431, (702) 358-7900 or (510) 657-1641,
> Fax (800) 372-6272, or approved substitute. Material is available from
> Neumark Inc., Albuquerque, New Mexico.
>
> 9\. Sleeves: Schedule 40 PVC when under Contractor-installed or
> removed and replaced pavement, Schedule 40 steel for sleeves under
> existing paving to remain.
>
> B. Valve Boxes: Precast concrete, fiberglass reinforced, or other type
> noted on the drawings, size as indicated on drawings.
>
> C. Valve Cover and Frame: Cast iron.
>
> D. Valves:
>
> 1\. Automatic Valves: As indicated on drawings or approved substitute.
>
> a\. Provide valves with a manual bleed screw on the bonnet and bleed
> ports protected with built-in filter. Provide valve which may be
> installed at any angle and has a flow control and manual shutoff.
>
> b\. Material: Noncorrosive.
>
> c\. Operation: Open and close smoothly with low pressure loss.
>
> d\. Solenoid: 24 volts A.C. 60 Hz, energy consumption not exceeding 6
> watts.
>
> e\. Identification: Clearly tag with legible permanent brass
> waterproof label indicating the controller zone number.
>
> 2\. Manual Valves: Curb stop per applicable sections of Underground
> Water Distribution specification.
>
> E. Controllers: Existing on site. Provide and install Mini-Clik Freeze
> Sensor, Model 401 as manufactured by Glen-Hilton Products Inc., P.O.
> Box 31614, Richmond, Virginia 23294, (804)264-0055. Product is
> distributed locally by Ellen Irrigation Co., (505) 344-3474.
>
> F. Wire:
>
> 1\. UL approved for direct burial, type UF, rated for 600 volts, PVC
> insulated.
>
> 2\. Minimum Wire Size: No. 16 AWG. Manufactured in minimum 2,500- foot
> reels.
>
> 3\. Common Wire: Plastic coated, white color.
>
> 4\. Control Wire: Insulated, single-strand copper designed for 24 to
> 50 volts, plastic coated, red color.
>
> 5\. Copper Strand: Meet or exceed ASTM B3.
>
> G. Wire Splicing Materials: Provide watertight splices using Spears
> #300 connectors and #100 glue, 3M brand, DBY connectors, or approved
> substitute.
>
> H. Backflow Preventers: As indicated on drawings.
>
> I. Flood Bubblers and Spray Heads:
>
> 1\. General: As scheduled, Rain Bird Sprinkler Mfg. Corp. or approved
> substitute. Include a serviceable screen on the bubbler and spray
> heads to prevent foreign materials from entering the sprinkler. Set
> flow adjustment to ensure even coverage and to avoid overspray.
>
> 2\. Bubbler: Fixed pattern.
>
> 3\. Pop-Up Spray: Fixed pattern, with screw-type flow adjustment,
> stainless steel retraction spring, and PRS module where noted on the
> drawings.
>
> J. Automatic Drain Valves: Corrosion-resistant PVC plastic, with 1/2
> inch male pipe threaded connections. The valve shall open when
> pressure in the line decreases to 9 psi and seal again when pressure
> increases to 10 psi. Provide a screen on both inlet and outlet.
> Install automatic valves only on laterals of average pipe size 1-1/2
> inch or less. Install at low points and at 100-feet on center in the
> laterals. Provide King Technology, Inc. automatic drain valve or
> approved substitute.
>
> K. Pressure Regulator: As indicated on drawings or approved
> substitute.
>
> L. Backfill Material: Use on-site material, except rock, large stones,
> brush, sod, frozen material or other unsuitable material as determined
> by the SDR. If additional backfill material is required, supply earth,
> loam, sandy clay, sand, or other approved material free of large clods
> of earth or sharp stones, capable of sustaining the same relative
> density of the surrounding ground.

[PART 3 - EXECUTION]{.underline}

3.01 [SYSTEM DESIGN]{.underline}

> A. The drawings are diagrammatic and indicative of the work to be
> installed.

3.02 [EXAMINATION]{.underline}

> A. General: Carefully investigate the structural and finished
> conditions affecting the work, and plan work accordingly to furnish
> fittings and appurtenances which are required to meet field
> conditions. Examine related work and surfaces before installing the
> work. Report in writing to the SDR conditions which will prevent
> proper execution.

3.03 [PREPARATION]{.underline}

> A. Trenching:
>
> 1\. Excavate to sufficient depth and width to permit proper handling
> and installation of the pipe and fittings. Cut trenches for pipe to
> the required grade lines. Compact the trench bottom to provide an
> accurate grade and uniform bearing for the full length of the line.
> Excavate trenches in straight lines. When two pipes are laid in the
> same trench, maintain a minimum of four inches between the pipe. In
> areas where trees are present, adjust trench location beyond the
> dripline of the tree.
>
> 2\. Depth: Excavate trenches of sufficient depth to provide specified
> soil cover for master lines and lateral lines.
>
> 3\. Staking: Stake all trench, sprinkler head and valve locations.
> Obtain SDR approval prior to trenching.
>
> 4\. Trim: Accurately trim trenches to provide a uniform bed, free of
> rocks, clods or other sharp-edged objects.
>
> 5\. Dewatering: Pump out or otherwise remove water encountered or
> accumulated in the excavation to keep the bottom of the trench or
> excavation free and clear of water during the progress of the work.
>
> 6\. Sleeved Crossings: Sleeve pipe and wiring under sidewalks,
> roadways, parking lots, or through walls. Provide sleeves a minimum of
> one inch in diameter greater than the pipe or wire bundle to be
> sleeved.
>
> 7\. Existing Lawns: Where trenching is required across existing lawns,
> uniformly cut strips of sod 6 inches wider than trench. Remove sod in
> rolls of suitable size for handling and keep moistened until
> replanted.
>
> 8\. Irrigation Line Slope: The minimum pitch of irrigation lines to
> automatic drain valves shall be 3 inches in 100 feet.

3.04 [INSTALLATION]{.underline}

> A. General: Install material and equipment in accordance with
> manufacturer\'s recommendations, Uniform Plumbing Code, and ASTM 2774.
> Install the work to avoid conflicts between underground irrigation
> installation, existing utilities, planting and other existing
> features.
>
> B. Maintain uninterrupted water service to building during normal
> working hours. Arrange for temporary water shut-off with SDR.
>
> C. Pipe:
>
> 1\. Provide connections between plastic pipe and metal valves or steel
> pipe with screw fitting, using plastic male adapters with the
> specified pipe sealant applied to male threads. Connect screwed
> connections with light wrench pressure. Do not screw steel pipe into
> plastic fittings except at head risers.
>
> 2\. Apply cleaner and solvent in accordance with ASTM D 2855 using the
> following procedure in sequence.
>
> a\. Apply an even coat of cleaner to the outside of the pipe and to
> the inside of the fittings. Remove dirt, dust, and moisture
> completely.
>
> b\. Apply primer to outside of pipe and inside of fittings in
> accordance with manufacturer\'s instructions.
>
> c\. Apply an even coat of solvent to the outside of the pipe and to
> the inside of the fittings. Reapply a light coat of solvent to outside
> of pipe, ensuring the coated area of pipe is equal to the full depth
> of the fitting socket.
>
> d\. Insert pipe quickly into fitting and turn approximately one-half
> turn to distribute solvent and remove air bubbles; check tees and ells
> for correct position.
>
> e\. Wipe off excess solvent with clean rags.
>
> f\. Allow solvent-welded joints to cure for 15 minutes before moving
> or handling.
>
> g\. Pressure test piping after solvent-welded joints have cured for 24
> hours.
>
> 3\. Do not lay pipe in water or in trench when weather conditions are
> unsuitable for work, except when expressly directed by the SDR. Rest
> the full length of each pipe section solidly on the pipe bed with
> recesses excavated to accommodate bells and joints.
>
> 4\. Thoroughly clean the interior of pipe and remove rocks, gravel,
> soil, and other objects prior to assembly. To insure a clean system,
> hold each joint of pipe in an upright position to allow foreign
> objects to fall out before the joint is attached to the system. As
> each additional joint is installed, ensure foreign objects do not
> enter the free end of the joint. At the end of a work period, cap open
> ends on installed pipe to keep out foreign matter. Securely close open
> ends of pipe and fittings to prevent trench water, earth or other
> substances from entering the pipes or fittings.
>
> 5\. Replace defective sections of pipe discovered before or after
> laying with sound pipe.
>
> 6\. Provide 4 inches minimum horizontal clearance between lines in the
> same trench. Install master lines (lines from master valve to
> automatic valves) with a minimum soil cover of 28 inches, exclusive of
> mulch or paving. Install lateral irrigation lines (lines from
> automatic valves to sprinkler heads) with a minimum soil cover of 18
> inches, exclusive of mulch or paving.
>
> 7\. Sterilize piping up to backflow preventer in accordance with
> Division 2 Section \"Exterior Water Distribution \".
>
> 8\. Provide for expansion/contraction of piping in accordance with
> manufacturer\'s recommendations.
>
> D. Saddle Taps: Do not use saddle taps. Use fittings and reducers to
> attach branches to the system. Do not use bushings, street ells, or
> close nipples, except where indicated.
>
> E. Jacked or Bored Sleeves: Use the following procedure to bore under
> paved surfaces.
>
> 1\. Bore hole under paved surfaces with a pneumatic boring device.
>
> 2\. Insert steel sleeves through hole with the pneumatic device, or by
> other methods approved by the SDR.
>
> 3\. Conditions of Bore.
>
> a\. Locate bore a minimum of 2\'-6\" below grade of the paved surface,
> unless otherwise directed by the SDR where sleeves cross existing
> utilities.
>
> b\. Bore hole a maximum 1 inch diameter larger than steel sleeves
> inserts.
>
> c\. Fill voids greater than 1 inch around the sleeve and bad bores
> with grout. Provide high strength grout, 5,000-6,000 PSI, 6 inch slump
> pumped at 1.3 cf/min., or approved by the SDR.
>
> d\. Weld multiple lengths of sleeves together or, if couplings fit
> within bore hole, couple together.
>
> e\. Do not use sleeves shorter than the length of the metallic part of
> the pneumatic boring device.
>
> f\. Repair or replace any damage caused by borings including, but in
> not limited to, cracks, bulges, and settlement in adjacent pavings and
> surfaces.
>
> g\. Verify boring locations. Do not penetrate existing utilities.
>
> F. Controllers: Install controllers in locations shown. Make power
> connections. Mount and wire the controllers in accordance with
> manufacturer\'s approved procedures. Install freeze sensor in
> accordance with manufacturer\'s recommendations.
>
> G. Sprinkler Heads: Install sprinkler heads at grade unless otherwise
> indicated. Install sprinkler heads with a minimum of 4 inches and a
> maximum of 6 inches clearance from curbs, walks, driveways, etc. and a
> minimum of 12 inches and a maximum of 18 inches from buildings and
> walls. Teflon tape shall be used on threaded connections at heads and
> joints. Install heads in vertical position, hand backfilled and
> compacted to near original density. Adjust all sprinkler heads to
> ensure proper watering of plant material.
>
> H. Valves and Valve Boxes: Cover automatic and manual control valves
> with valve boxes. Set top of boxes at grade. Install automatic valves
> according to manufacturer\'s recommendations and as shown. Set
> Pressure Regulating Module to 45 PSI or as directed by SDR. Coordinate
> valve boxes locations with planting plan. Install valve boxes square
> with buildings or walks. Wire each valve to a separate station on the
> controller. Clearly tag each valve with a legible, permanent,
> waterproof tag indicating the controller zone number
>
> I. Control Wiring: Install control wires in same trenches as
> irrigation main lines and laterals whenever practical. Snake wires in
> the trench to allow for displacement of the wire during backfilling.
> Securely tape wires running in the same trench together at 10-foot
> intervals. Place wiring bundles to one side of piping (east of
> north/south lines and north of east/west lines) at a maximum of 3
> inches from piping. If wiring is not in the same trench as piping or
> is under paving, install in Schedule 40 PVC piping and provide 18
> inches minimum cover.
>
> J. Splices: Minimize wire splices. Where splices are required, use
> common splice boxes located in valve boxes. Provide a slack-wire loop
> at each valve with enough slack so that wire splices can be extended
> 24 inches above ground level to facilitate testing and trouble
> shooting.
>
> K. Codes and Other Electrical Information: Install 115 volt AC wiring
> in accordance with requirements of the National Electrical Code and
> electrical specifications. Provide electrical service to controllers
> consisting of one black and one white wire in rigid conduit. Connect
> electrically-operated devices and metal enclosures to ground, in
> accordance with manufacturer\'s recommendations.
>
> L. Automatic Drain Valves: Install automatic drain valves on lateral
> lines only, at low points, 100 foot o.c.; install one cubic foot
> washed gravel, with filter fabric completely surrounding gravel at
> each drain valve. Install automatic drain valves 3 inches below top of
> gravel. Install a 2-inch diameter Class 200 PVC pipe vertically above
> drain valve. Do not connect to pipe. Install with slip cap (not
> solvent welded), with 1/2-inch diameter hole. Install top of pipe
> flush with gravel
>
> M. Backflow Preventer: Install as detailed and in conformance with the
> Uniform Plumbing Code.
>
> N. Thrust Block: On lines over 2 inches in diameter, install concrete
> thrust blocks at tees, bends, and pipe ends.

3.05 [FIELD QUALITY CONTROL]{.underline}

> A. Inspection and Testing:
>
> 1\. Inspection: The SDR may inspect the work at any time. Maintain
> proper facilities and provide safe access for inspection. When testing
> or approval is required, notify the SDR 24 hours in advance where and
> when testing will take place. Do not cover up work before testing or
> approval is obtained. If work is covered up before testing or approval
> is obtained, uncover, test, and restore surface at no expense to SNL.
>
> 2\. Rejection: If any portion of the work done or any materials
> delivered fail to comply with requirements, immediately correct the
> deficiency at no additional expense. Remove rejected materials from
> the site.
>
> 3\. Pressure Testing: Pressure test PVC main lines piping after laying
> and completing joints and setting valves but prior to backfilling.
> Pressure test using the following procedure.
>
> a\. Load each pipe length with a small amount of backfill to prevent
> arching or slipping under pressure. Do not cover up fittings.
>
> b\. Flush out all lines, then cap all outlets and hydro- statically
> test the complete system. Test line between master valves and remote
> control valves (where applicable) at a pressure of 100 psi. Test
> laterals (intermittently pressurized) in the same manner at existing
> available static pressure.
>
> c\. Expose joints for inspection during the pressure test. Swing
> joints may be installed prior to pressure test. Maintain pressure
> tests on plastic pipe for not less than 4 hours for master lines and 2
> hours for lateral lines. If pressure loss occurs, beyond extent
> acceptable to SDR, repair affected line and repeat tests until the
> entire system has been proven tight. Conceal lines passing hydrostatic
> pressure test the same day if temperatures 32 degrees and below are
> anticipated. Install pressure gauges on the line being tested.

3.06 [BACKFILLING]{.underline}

> A. After pipe joints have been visually inspected and pressure testing
> has been accomplished and approved, begin backfilling. Backfill when
> the pipe is not in an expanded condition due to heat or pressure. Cool
> pipe by operating the system for a short time before backfill, or by
> backfilling early in the morning before the heat of the day.
>
> B. Place backfill in horizontal layers not exceeding 8 inches in loose
> depth. Thoroughly tamp and use water compaction by flooding trenches
> after each lift and allowing for settlement. Do not water flood any
> trenches adjacent to walls, sidewalks, curbs, or buildings. Backfill
> and compact trenches adjacent to walls, sidewalks, or buildings with a
> mechanical compactor after each lift. Compact to original density or
> 90 percent in unpaved areas and 95 percent in paved areas. Compact to
> maximum density at optimum moisture in accordance with ASTM D 1557 or
> AASHTO T180, whichever is greater, to minimize settlement.
>
> C. Place backfill to the original ground level or to the grades
> indicated and fill with topsoil to finish grade.

3.07 [COVERAGE AND ADJUSTMENT]{.underline}

> A. When the underground irrigation system installation is complete,
> perform a coverage test to determine if the water coverage for
> planting areas is complete and adequate and that spray does not hit
> buildings, walks and other locations where not required. Correct
> coverage inadequacies.
>
> B. Adjust all heads and valves. Program controller to provide optimum
> underground irrigation system performance.

END OF SECTION