CONSTRUCTION SPECIAL SPECIFICATION

SECTION 02812-S

[DRIP IRRIGATION SYSTEM]{.underline}

Page

[[PART 1 - GENERAL 2]{.underline}](#general)

[1.01 Summary 2](#summary)

[1.02 References 3](#references)

[1.03 QUALITY ASSURANCE 4](#quality-assurance)

[1.04 STORAGE & HANDLING 4](#storage-handling)

[1.05 SYSTEM DESCRIPTION 5](#system-description)

[1.06 SUBMITTALS 5](#submittals)

[1.07 PERFORMANCE 6](#performance)

[1.08 JoB CONDITIONS 6](#job-conditions)

[1.09 DELIVERY, STORAGE & HANDLING 7](#delivery-storage-handling)

[1.010 WARRANTY 7](#warranty)

[1.011 MAINTENANCE 7](#maintenance)

[PART 2 - PRODUCTS 7](#products)

[2.01 MATERIALS 7](#materials)

[PART 3 - EXECUTION 11](#execution)

[3.01 EXAMINATION 11](#examination)

[3.02 TRENCHING 11](#trenching)

[3.03 INSTALLATION 12](#installation)

[3.04 TEST & FLUSHING - INSPECTION 14](#test-flushing---inspection)

[3.05 BACKFILLING 15](#backfilling)

[3.06 OPERATION AND MAINTENANCE 15](#operation-and-maintenance)

[3.07 ACCEPTANCE 16](#acceptance)

**CONSTRUCTION SPECIAL SPECIFICATION**

SECTION 02812-S

[DRIP IRRIGATION SYSTEM]{.underline}

# [GENERAL]{.underline} {#general .SECTION-1}

## Summary {#summary .SECTION1.01}

A. Sustainable design conserves and protects our natural resources,
water, being an important one of these. Drip irrigation systems save
water by delivering slow, steady amounts of water directly to plant
roots cutting down on evaporation, runoff and overspray.
Drought-resistant native plants need only to receive the amount of water
they require. They need supplemental water during the first year or two
to get established then watering can usually be eliminated altogether
except during periods of severe drought.

B.  This section covers the requirements for the installation of a
    complete underground, automatically controlled drip irrigation
    system for areas delineated on the Landscape Drawings, including but
    not limited to the following:

    1.  Piping

        a.  Poly pipe or poly tubing is **[not]{.underline}** acceptable
            at Sandia.

    2.  Backflow Preventer

    3.  Emitters

    4.  Valves

    5.  Controller

    6.  Control Wiring

    7.  Fittings/Clamps

    8.  Electrical Connections

    9.  All Necessary Accessories

        C. Related Sections: The following sections contain requirements
        that relate to this Section.

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    1.  Applicable sections of Division 2 -- Site Construction.

    2.  Applicable section of Division 15, Mechanical.

    3.  Applicable section of Division 16, Electrical.

        D. Perform trenching, excavation, boring, backfilling, and
        compacting as required.

## References {#references .SECTION1.01}

A.  Reference publications are listed by the manufacturer's technical
    data and product literature and are not referred to within the
    specification.

    Drip Irrigation Design for Landscapes, by Joseph Y.T. Hung, Paper
    Number 88-2066 presented at the American Society of Agricultural
    Engineers, Rapid City, SD, 1988

    Determining Drip Emitter Spacing and Watering Time for Maximum Water
    Use Efficiency, by Joseph Y.T. Hung, Paper presented at the
    Irrigation Association, San Diego, CA, 1993

    Estimating Water Requirements of Landscape Plantings: The landscape
    Coefficient Method, Cooperative Extension University of California,
    Division of Agriculture and natural Resources, Leaflet 21493

    Water Use Classification of Landscape Species, (WUCOLS Project),
    Cooperative Extension University of California, February 1992

    Landscape Drip Irrigation Design Manual, by Keith Shepersky, Rain
    Bird Sales, Inc., 1984

    Irrigation Principles and Practices, Fourth Edition, by Vaughn E.
    Hansen, Orson W. Israelsen, Glen E. Stringham, 1979

    Rain Bird Trickle Irrigation Design, First Edition, by Jack Keller,
    Ph. D. and David Karmeli, Ph. D., Rain Bird Sprinkler Manufacturing
    Corp., 1975

B.  The following publications are referenced in this Section:

    1.  American Society for Testing and Materials (Latest Edition) --
        ASTM.

        D-1784 Std. Specification for Rigid Poly Vinyl Chloride (PVC)
        Compounds and Chlorinated Poly Vinyl (CPVC) compounds

        D- 1785 Std. Specification for Poly Vinyl Chloride (PVC) Plastic
        Pipe, Schedules 40, 80, & 120.

        D-1875 Std. Test Method for Density of Adhesives in Fluid Form

        D-2241 Std. Specification for Poly Vinyl Chloride (PVC)
        Pressure-Rated Pipe.

        D-2464 Std. Specification for Threaded Poly Vinyl Chloride (PVC)
        Plastic Pipe Fittings, Schedule 80.

        D-2466 Std. Specification for Poly Vinyl Chloride (PVC) Plastic
        Pipe Fittings, Schedule 40.

        D-2467 Std. Specification for Poly Vinyl Chloride (PVC) Plastic
        Pipe Fittings, Schedule 80.

        D-2564 Std. Specification for Solvent Cements for Poly Vinyl
        Chloride (PVC) Plastic Piping Systems.

        D-2774 Std. Practice for Underground Installation of
        Thermoplastic Pressure Piping.

        D-2855 Std. Practice for Making Solvent-Cement Joints with Poly
        Vinyl Chloride (PVC) Pipe & Fittings.

    2.  National Electric Code.

    3.  International Plumbing Code.

    4.  National Sanitation Foundation.

## QUALITY ASSURANCE {#quality-assurance .SECTION1.01}

C.  Installer Qualifications: Licensed landscaping contracting firm with
    not less than five \[5\] years experience in the type and scale of
    work required in this Section.

D.  All irrigation work shall be performed by a single firm specializing
    in this type of work.

E.  Manufacturer Qualifications: Provide underground irrigation system
    as a complete unit produced by acceptable manufacturers, including
    heads, valves, piping circuits, controls, and accessories and as
    specified in this Section.

    1.  Manufacturer regularly and presently manufactures the items
        submitted as one of their principal products.

## STORAGE & HANDLING {#storage-handling .SECTION1.01}

F.  Follow manufacturer's recommended procedures in loading, unloading,
    stacking, transporting and handling of all materials to be used.

## SYSTEM DESCRIPTION {#system-description .SECTION1.01}

A.  Sandia landscape irrigation system is computer controlled from a
    central location by a CALSENSE control system. The system is known
    as Central Irrigation Control System or CICS. All existing and new
    irrigation systems shall be connected to CICS via CANLSENSE field
    controller.

## SUBMITTALS {#submittals .SECTION1.01}

A.  Submit manufacturer's literature, technical data, and
    recommendations for the system as specified including:

    1.  Backflow Preventer

    2.  Controller ([must]{.underline} be compatible with CICS)

    3.  Electrical Connectors

    4.  Emitters

    5.  Filters

    6.  Fittings

    7.  Flow Sensors (CALSENSE)

    8.  Piping (All types)

    9.  Rain & Freeze Sensors

    10. Valves

    11. Wiring

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G.  Shop Drawings:

    1.  Drip Irrigation Layout Plan to include the following:

        a.  Controllers (location & mounting detail).

        b.  Piping layout and size.

        c.  Layout - size, and type of emitters, and sprinkler heads.

        d.  Fittings.

        e.  Valves (types), sizes and locations.

        f.  Wiring Schematics.

        g.  Connection to existing water line.

H.  Submit reproducible As-built drawings.

I.  Submit print of controller chart.

J.  Pressure Test.

    1.  Contractor is responsible for conducting water pressure flow
        test at point of connection to the main and furnishing results
        to the SDR. Such testing shall be done at a minimum pressure of
        100psi.

    2.  No other work is to proceed until the SDR has received pressure
        test data.

K.  Submit all of the above in accordance with Provisions of Section
    01300 -- Submittal Procedures.

## PERFORMANCE {#performance .SECTION1.01}

L.  Design Pressure: The system requires a total design pressure of
    15-45 psi. Design pressure is defined as maximum pressure required
    overcoming all pressure losses and leaving a residual pressure at
    the emitters not less than the manufacturer\'s minimum pressure
    requirement.

> 1\. Precipitation Rate

a.  Determine location of emitters based on location of proposed shrubs
    in planter areas shown on the Contract Drawings.

b.  Layout: Locate emitters to provide uniform distribution to all
    plants.

c.  Perform test & balance.

## JoB CONDITIONS {#job-conditions .SECTION1.01}

M.  Existing Conditions:

    1.  Utilities: Verify the locations and sizes of stub outs for water
        sources indicated on the Contact 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.  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.

    3.  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.

N.  Prior to installing irrigation heads, stake or otherwise locate
    trees and shrub areas according to document plans, or as adjusted in
    the field under SNL's direction. Coordinate bubblers and shrubs
    pop-up heads with tree and shrub locations. Do not lay irrigation
    lines in root ball zones.

O.  Coordinate tree, shrub, and plant layout with the SNL Gardner --
    Dept. 10843-3 and the project SDR.

## DELIVERY, STORAGE & HANDLING {#delivery-storage-handling .SECTION1.01}

P.  Delivery and Storage: Coordinate delivery and on-site storage
    location with the SDR. Do not store PVC pipes in direct sunlight.

Q.  Product Handling: Follow manufacturer\'s recommended procedures for
    loading, unloading, stacking, transporting and handling materials
    and equipment.

## WARRANTY {#warranty .SECTION1.01}

R.  General: Warranty underground irrigation system through the
    specified warranty period \[one-twelve month growing season\]
    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.

S.  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.

## MAINTENANCE {#maintenance .SECTION1.01}

T.  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.

# [PRODUCTS]{.underline} {#products .SECTION-1}

## MATERIALS {#materials .SECTION1.01}

A. CALSENSE Flow Sensor

U.  Pipe and Pipe Fittings:

    1.  Polyvinyl Chloride Pipe (PVC).

        a.  Schedule 40 complying with ASTM D 1785, continuously marked
            with identification of the manufacturer, type, class, and
            size. Provide pipes in 20-foot lengths, free of holes,
            foreign material, blisters, wrinkles or dents.

        b.  PVC compounds are restricted to PVC-1120 and PVC-1220.

    2.  Inline Emitter Tubing

        a.  Pressure compensating inline emitter tubing.

        b.  Dual outlet ports.

        c.  Pressure from 8-60 psi.

        d.  Flow rate: 0.92 GPH, 120-mesh filtration.

        e.  0.63" O.D, 0.54" ID with a 0.045" wall thickness.

        f.  18" emitter spacing.

        g.  Multi-Outlet Emission Device: Rainbird Xeri-Bird XBD-80 or
            approved equal.

    3.  PVC Pipe Fittings: Schedule 40 PVC socket fitting, Type 1, Cell
        Classification 12454-B, complying with ASTM D 2466, D 2467, and
        D 1784.

    4.  Threaded Nipples: Schedule 80 PVC pipe.

    5.  Risers: Schedule 40 PVC pipe.

    6.  Cleaner, Primer, and Solvent Cements:

        a.  Cleaner: Uni-Weld 7300 cleaner or approved equal.

        b.  Primer: Uni-Weld 8700, Hi-Etch purple primer, ASTM F656, or
            approved equal.

        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 clear, light viscosity type for Flex/PVC
            connections or approved equal.

    7.  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.

    8.  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.

    9.  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.

    10. Sleeves: Class 200 PVC.

    11. Poly pipe or poly tubing is **[not]{.underline}** acceptable at
        Sandia.

V.  Remote Control Valves:

    1.  Control Valve: PEB Series as manufactured by Rainbird.

    2.  Master Valve: PEB Series as manufactured by Rainbird.

    3.  Provide valves of heavy-duty plastic housing body and cover with
        stainless steel spring and metal parts of brass.

    4.  Solenoid operated, balanced-pressure diaphragm, angle type, 150
        psi CWP rating.

    5.  External and internal bleed.

    6.  Solenoid complying with Class II National Electric Code.

    7.  Energy-efficient, low-power encapsulated solenoid with captured
        plunger and 90-mesh solenoid filter.

    8.  Buna-N-diaphragm with belt-cleaning 90 mesh pilot water filter
        and capture spring.

W.  Backflow Preventer Valve:

    1.  Use RP or PVB valves.

X.  Automatic Drain Valve:

    1.  Use plastic valves.

    2.  Treaded piping connection.

    3.  Actuating plunger spring loaded to closed at 0.5 PSI and open
        against a 6\' head of water in either vertical or horizontal
        position.

    4.  Inlet and outlet ends covered with 30 mesh monel screens.

Y.  QUICK COUPLER VALVES

    1.  Provide quick coupler valves approximately every 50 FT or as
        indicated on the Contract Drawings. Provide coupler keys, swivel
        ells, and hose bibs in the quantity of one for each quick
        coupler.

Z.  Valve Boxes:

    1.  Specification grade valve boxes and bottom extensions as
        manufactured by Carson Industries LLC.

    2.  Control valve boxes shall be 17" x 30" x 15"H with locking
        covers as manufactured by Carson Industries LLC.

A.  Emitters:

    1.  Single outlet pressure compensating emitters complete with flow
        control disk, 5/16\" diameter emitter ball and cap seal. Emitter
        constructed of black, heat resistant plastic.

    2.  Pressure compensating.

    3.  Self-flushing.

    4.  Pre-set to emit .5 to-12 gallons per hour at operating pressures
        of 15 to 45 psi.

B.  Wye Filters:

    1.  150-psi pressure rated.

    2.  Cap with sealing O-ring.

    3.  Flow rate of 0 to 30 GPM.

    4.  200 mesh filter element.

    5.  Size range from ¾" to 1".

C.  Inline Pressure Regulator

    1.  Install above or below ground.

    2.  Outlet pressures of 30 psi, 40 psi or 50 psi.

    3.  ¾" or 1" female threaded inlet and outlet.

D.  Automatic Controller:

    1.  Calsense Controller ET-2000-8, 24 or 40 MLR with local radio and
        grounding rod. Specify size based on project.

E.  Wire:

    1.  Provide #12RW color-coded wiring to electric control valves from
        automatic controller, which is Underwriters Laboratories,
        approved for direct underground burial.

    2.  Provide a single wire to each solenoid from controller and a
        common neutral wire to all solenoids from controller as power
        supply.

F.  Rain Sensor:

    1.  Provide a Rain Switch that is compatible with CICS.

G.  Freeze Sensor:

    1.  Provide a Freeze Sensor that is compatible with CICS.

# [EXECUTION]{.underline} {#execution .SECTION-1}

## EXAMINATION {#examination .SECTION1.01}

> A. Examine grading and existing conditions under which drip irrigation
> system is to be installed. Proceed with installation if conditions are
> satisfactory. Examine related work and surfaces before installing the
> work. Report in writing to the SDR conditions which will prevent
> proper execution.

## TRENCHING {#trenching .SECTION1.01}

A.  Stake out all sprinkler head and valve locations prior to trenching
    for review and approval by the SDR.

B.  Excavate trenches straight and true with bottom uniformly sloped to
    low points. Make excavations of sufficient depth and width to permit
    proper handling and installation of the pipe and fittings. Clean
    trench of all soil, rocks, and debris before installing pipe and
    fittings.

C.  Excavate trenches to a depth of 3-inches below invert of pipe,
    unless otherwise indicated.

D.  Where trenching extends thru rocky soil, piping shall be bedded in
    2-inches of sand or approved backfill material extended to a minimum
    of 2-inches over the top of piping.

E.  Provide 24-inch clearance between top of pipe and finish grade for
    pressure lines, and 18-inches for non-pressure lines, except where
    otherwise indicated on Contract Drawings. When two or more pipes are
    to be placed in the same trench, maintain a minimum of 1-inch
    horizontal and vertical distance between the pipes.

F.  Accurately trim trenches to provide a uniform bed, free from rocks,
    clods, or other sharp-edged objects.

G.  Pitch piping to drain a minimum of 6-inches in each 100 feet \[or
    0.5%\].

H.  Keep bottom of trench or excavation free and clear of water during
    installation.

I.  Where existing pavement must be cut to install landscape irrigation
    system, cut smoothly to straight lines 6-inches wider than trench.

    1.  Remove cut out pavement and excavated material from the site.

    2.  Sleeve pipe and wiring under sidewalks, roadways, or parking
        lots in Class 200 PVC pipe. Size pipe sleeves 2-inches larger
        \[inside diameter\] than pipe to be sleeved.

    3.  Repair and replace pavement cuts with equivalent materials and
        finishes.

##  INSTALLATION {#installation .SECTION1.01}

A. General:

> 1\. Install drip system equipment with necessary hardware in
> accordance with final approved shop drawings, manufacturer\'s
> instructions and as specified herein.

B. PVC main lines.

1\. Bed and backfill to 12-inches over PVC pipe with existing soil
unless existing soil is rocky or contains other unsuitable materials as
determined by the SDR.

1.  Avoid electric conduits, storm drain lines, and other existing
    utilities, all of which have the right-of-way.

2.  Minimum cover over mains and control valves is 24 inches. Minimum
    cover over laterals is 18-inches.

3.  All piping in planters is to rest on gravel filtration layer and
    placed prior to placement of soil.

4.  Use PVC sleeves beneath paved surfaces, through planter walls, and
    at locations shown on the plans.

5.  Do not cut sidewalks, drives, or curbs during installation of pipes
    unless otherwise noted.

6.  Cover and protect open pipe ends, fixtures and equipment from dirt,
    water and chemical or mechanical damage during installation.

7.  Drain each sprinkler section (lateral) to an automatic drain placed
    at the low point in the system.

8.  Place 12\"x 6\" gravel pit around outlet end of all automatic
    drains. Gravel drain backfill shall be of cleaned gravel or crushed
    stone, graded from ¾-inch min. to 1-1/2 inch maximum.

9.  At completion of work, thoroughly clean fixtures, exposed materials
    and equipment.

    C. Laying PVC Pipe:

    1\. Snake pipe at least 1 foot per every 100 feet to allow for
    thermal expansion.

    a.  Solvent weld socket type.

    b.  Threaded Type: Apply liquid teflon thread lubricant to teflon
        thread type.

> D. Laying Inline Emitter Tubing:

1.  Make all connections according to manufacturer's instructions.

2.  Lay tubing at grade below mulch.

    E. Wiring:

    1\. Keep splicing to a minimum.

    2\. Provide 12-inch expansion loops in wiring at each wire
    connection or change in wire direction.

    3\. Provide 24-inch expansion loop at remote control valves.

    4\. Run control wiring through conduit in areas designated on the
    Plans. Direct burial is acceptable when/where approved by the SDR.

    5\. Do not run power wiring in the same conduit as control wiring.

    6\. Solder splices, coat with general bakelite cement, wrap with
    electrical tape and coat again with general bakelite cement. Crimp
    type connectors may be substituted.

    F. Setting of Valves:

    1\. Do not locate valves beneath paved surfaces.

    2\. Install valves in a level position.

    3\. Install all valves, except backflow preventer, with minimum
    24-inches cover.

    4\. Provide key for manual operation of remote control valves.

    G. Sleeving:

    1\. Furnish and install PVC sleeving where control wires or pipe
    pass under paved surfaces and through concrete planter walls.

    a\. Provide sleeving of twice the size of pipe to be sleeved to
    allow for retrieval.

    b\. Extend sleeving 12 inches beyond end of paving at each end.

    c\. Bed sleeves, installed by open cut, with sand to 12\" above
    pipe.

    d\. Install pipe with 24-inches of cover.

    e\. Seal joint between sleeves and pipe through planter walls with
    waterproof caulking.

## TEST & FLUSHING - INSPECTION {#test-flushing---inspection .SECTION1.01}

A.  Provide for inspection of work by the SDR at any time. Whenever
    testing or approval is required, provide notification to the SDR 24
    hour in advance. Should work requiring testing or approval is
    backfilled prior to notification, the Contractor, at the
    Contractor's expense, shall uncover, retest and reset the surface if
    directed by the SDR.

B.  Should any portion of the Work done or any materials delivered fail
    to comply with requirements of the Specification or Contract
    Drawings, such work or materials shall be rejected and shall be
    immediately removed from the site. Defective work or materials shall
    be corrected satisfactorily.

C.  Following installation, and prior to placing soil or backfilling,
    make final adjustments of Drip Irrigation System.

    1.  Flush system completely to remove debris from line with in-line
        emitter tubing and pop-up heads removed.

    2.  Replace in-line emitter tubing and flush system again checking
        for proper operation.

D.  Following final adjustment, operate the entire installation to
    demonstrate the complete and successful operation of all equipment.

E.  A pressure test of main line at 150 psi for 2 hours and a pressure
    test of lateral lines at 125 psi for 2 hours is required.

    1.  Center-load the piping with a small amount of backfill to
        prevent arching or slipping under pressure. Flush out all lines,
        then cap all outlets and hydrostatically test the normally
        pressurized part of the system at a pressure of 150 psi as
        specified in the International Plumbing Code. Test lines between
        master valves and remote control valves (where applicable) in
        the same manner at a pressure of 100 psi.

    2.  Test laterals (intermittently pressurized) in the same manner at
        existing available static pressure. Leave joints exposed for
        inspection during the pressure test. Do not install swing joints
        or flexible nipples prior to pressure test. Maintain pressure
        tests on plastic pipe for not less than 4 hours. Do not use air
        pressure test.

    3.  If pressure loss occurs, affected line shall be repaired and
        test shall be repeated until the entire system has been proven
        tight. Conceal lines passing hydrostatic pressure test the same
        day if nighttime temperatures are to be 32° Fahrenheit and
        below. Install pressure gauges on the line being tested.

## BACKFILLING {#backfilling .SECTION1.01}

A. After pipe joints have been visually inspected and flushing and
pressure testing has been accomplished and approved, backfilling may
begin. Begin backfilling when the piping is not in an expanded condition
due to heat or pressure. Cooling of the piping can be accomplished by
operating the system for a short time or by backfilling in the cool a.m.
hours of the day. Place backfill in horizontal layers not exceeding
8-inches in loose depth and thoroughly hand-tamp to 85% in unpaved areas
and 90% in paved areas of maximum density at optimum moisture so that
minimum settlement will result. Place backfill to the original grade
level or to the limits designated on the Contract Drawings and use
topsoil to fill to finish grade.

## OPERATION AND MAINTENANCE {#operation-and-maintenance .SECTION1.01}

A. Maintain and adjust the irrigation system in coordination with the
plant materials requirements until substantial completion. Irrigation
maintenance shall include repair and replacement of parts or workmanship
not operating properly and adjustment of timing and coverage of heads.

1\. Provide on-job site consultation with Sandia's operating personnel
for a period of 3 months, not to exceed 4 hours per month, at no charge
to Sandia.

B. Record Drawings and Controller Chart:

1.  Maintain a complete set of up-to-date as-built drawings and provide
    a copy to the SDR.

    2\. Prepare a controller chart showing:

    a\. Location of all sections, valves, lateral lines, and routes of
    control wires.

    b\. Identify all valves as to size, station, and number.

    c\. Provide chart as a blue-line print with a different color used
    to show area of coverage for each station.

    d\. Locate chart inside controller door. Seal chart between two
    pieces of plastic.

    e\. Complete chart and receive approval prior to final inspections
    of irrigation system.

    3\. Submit a monthly irrigation schedule audited by certified
    landscape irrigation professional.

## ACCEPTANCE {#acceptance .SECTION1.01}

A.  When work is completed, including maintenance, the SDR will, upon
    request, make an inspection to determine system acceptability.

B.  Where inspected irrigation work does not comply with requirements,
    replace rejected work and continue specified maintenance until
    re-inspected by the SDR and work is found to be acceptable. Remove
    rejected equipment and materials promptly from project site.

END OF SECTION