Pima County Department of Transportation Landscape · PDF filePart 1: Introduction Pima County Department of Transportation - Landscape and Irrigation Guidelines 1-2 Goals for Landscape

Pima County Department of Transportation 201 N. Stone Avenue, 4th Floor, Tucson, Arizona 85701

April 2008

Pima County Department of Transportation Landscape and Irrigation Guidelines

Pima County Department of Transportation 201 N. Stone Avenue, 4th Floor, Tucson, Arizona 85701

April 2008

Pima County Department of Transportation Landscape and Irrigation Guidelines

Introduction

Part 1: Introduction

Pima County Department of Transportation - Landscape and Irrigation Guidelines 1-1

Purpose of Document:

Blue Book Standards:

These Guidelines were prepared and adopted by the Pima County Departmentof Transportation (PCDOT) to guide the design of landscape and irrigationimprovements associated with Pima County maintained roadways.

The information in these guidelines represent the most current thinking withregards to methods and materials, however, they need to be evaluated againstthe City of Tucson/Pima County Standard Specifications for PublicImprovements 2003 edition (known as the "Blue Book"). In the event that thereis a conflict between the Blue Book and these guidelines, the designer shallwork with the appropriate team members (Project Manager, Field Engineering,Maintenance/Ops, etc.) to identify which document shall be used and whetherany additional Special Provisions need to be developed.

Related Documents: These guidelines are intended to supplement, and be used in conjunction with,the following documents:

• City of Tucson / Pima County Standard Details for Public Improvements(2003 Edition)

• City of Tucson / Pima County Standard Specifications for PublicImprovements (2003 Edition)

• Pima County Department of Transportation and Flood Control DistrictRoadway Design Manual

Applicability: These guidelines apply to all new arterial and collector roadway projectsdesigned by, or for, Pima County. These guidelines also apply to roadwayprojects designed by private entities that will ultimately be dedicated to, andmaintained by the Pima County Department of Transportation.

It is not the intent of the Pima County Department of Transportation (PCDOT)to unreasonably limit innovative and creative design. Deviations from theguidelines are subject to PCDOT review and approval. Proposed deviationsmust demonstrate compliance with the goals for landscape development asstated herein, must not create undue maintenance requirements, and must be incompliance with all applicable safety standards. Deviations will be reviewedon a case-by-case basis.

Contents andOrganization ofDocument:

This documents includes the following:

• Part 1: Introduction• Part 2: Landscape Guidelines• Part 3: Irrigation Guidelines• Appendix A: Landscape Policies of Pima County Wastewater Management• Appendix B: Recommended Planting Details• Appendix C: Recommended Irrigation Details

Part 1: Introduction


Goals for Landscapeand IrrigationDevelopment:

C Appendix D: Typical Special Provisions• Appendix E: Standard Bid Item List

Landscape and irrigation improvements are typically an integral component ofall new arterial and collector roadway projects in Pima County. Specific goalsfor landscape and irrigation development associated with these project are:

C To provide for the on-site reuse of native plant specimens salvaged from thesubject roadway corridor.

C To enhance the visual character of transportation corridors within PimaCounty through consistent use of native and desert adapted, drought tolerantplant species and standard hardscape elements.

• To reduce the impacts of roadway development on adjacent residentialproperties through landscape screening.

• To provide safe conditions along transportation corridors consistent withapplicable national, state, and county standards.

• To balance the goal of providing attractive landscape development with thecommunity goal of water conservation.

• To utilize storm water harvesting techniques where appropriate.

• To provide attractive landscape improvements that are maintainable withinthe limits of County resources.

• To minimize conflicts between landscape improvements for transportationdevelopment and public utility lines.

• To provide consistent graphic representation of improvement plans in orderto facilitate design review, project bidding and project construction.

• To encourage and facilitate multi-modal use of transportation corridors.

• To incorporate environmental permitting requirements into the landscapeand irrigation design.

Landscape Guidelines

Part 2: Landscape Guidelines


Recommended Plant Species:

All plants utilized in conjunction with roadside and median plantings on Pima County projects shall be drought tolerant, desert adapted species. Emphasis should be given to native species that are indigenous to the project area. Plants that are known to produce pollen that causes allergies in humans should generally be avoided. Selected plants should require minimum maintenance and be resistant to pests and disease. The following plant species are recommended for use in conjunction with roadside and median plantings: Trees: Acacia anuera .............................................................................................Mulga Acacia salicina.............................................................................. Willow Acacia Acacia schaffneri ......................................................................... Twisted Acacia Acacia smallii...................................................................................Sweet Acacia Acacia stenophylla ................................................................... Shoestring Acacia Celtis reticulata.....................................................................................Hackberry Cercidium floridum ..................................................................... Blue Palo Verde Cercidium microphyllum...................................................... Foothills Palo Verde Cercidium praecox.................................................................................Palo Brea Chilopsis linearis ........................................................................... Desert Willow Lysiloma thornberi........................................................................... Feather Bush Olneya tesota .........................................................................................Ironwood Pithecellobium flexicaule ................................................................. Texas Ebony Prosopis pubescens .............................................................. Screwbean Mesquite Prosopis velutina ....................................................................................Mesquite Large Shrubs: Acacia constricta .................................................................... Whitethorn Acacia Acacia greggii .............................................................................. Catclaw Acacia Asclepias subulata .....................................................................Desert Milkweed Atriplex canescens................................................................... Fourwing Saltbush Atriplex lentiformis ............................................................................Quail Brush Caesalpinia pulcherrima .................................................... Red Bird-of-Paradise Calliandra californica .............................................................. Baja Fairy Duster Castela emoryi ......................................................................... Crucifixion Thorn Celtis pallida ............................................................................. Desert Hackberry Cordia parvifolia ......................................................................Little Leaf Cordia Dalea pulchra .....................................................................................Bush Dalea Dodonaea viscosa ...................................................................................Hopbush Eremophila spp. ....................................................................................Emu Bush Eysenhardtia orthocarpa ..................................................................Kidneywood



Recommended Plant Species (Continued):

Larrea divaricata (1) ……………….………………………………... Creosote Leucophyllum frutescens ................................................................ Texas Ranger Leucophyllum spp. ......................................................... Texas Ranger (varieties) Senna wislizenii ............................................................................ Shrubby Senna Simmondsia chinensis................................................................................. Jojoba Sophora secundiflora.......................................................Texas Mountain Laurel Vauquelinia californica ..........................................................Arizona Rosewood Vitex agnus castus ............................................................................. Chaste Tree Zizyphus obtusifolia ............................................................................Gray Thorn Small Shrubs: Ambrosia deltoidea..............................................................Triangleleaf Bursage Calliandra eriophylla ....................................................................... Fairy Duster Chrysactinia mexicana .........................................................................Damianita Dalea frutescens ................................................................................Black Dalea Encelia farinosa...................................................................................Brittlebush Ericameria laricifolia .................................................................Turpentine Bush Jatropha cardiophylla ....................................................................... Limberbush Psilostrophe cooperi........................................................................Paper Flower Ruellia peninsularis ...........................................................................Baja Ruellia Tumamoca macdougalii .....................................................Tumamoc globeberry Cacti: Carnegiea gigantea ................................................................................. Saguaro Ferocactus spp.................................................................................Barrel Cactus Mammalaria spp., etc. ..................................................... (Small Salvaged Cacti) Opuntia spp..................................................................... Prickly Pear and Cholla Accents: Agave spp....................................................................................................Agave Agave murpheyi ......................................................................... Hohokam Agave Dasylirion spp.................................................................................. Desert spoon Fouquieria splendens (2)......................................................................... Ocotillo Hesperaloe spp. .................................................................................. Hesperaloe Nolina spp............................................................................................Bear Grass Yucca spp.................................................................................................... Yucca Groundcovers: Dalea greggii ........................................................................Trailing indigo bush Lantana montevidensis >Gold Mound= ............................. Trailing yellow lantana Rosmarinus Officinalis >Prostratus=........................................Creeping rosemary



Discouraged Plant Species: Notes:

The following plants have not demonstrated an acceptable level of survival in the roadway environment or are otherwise problematic for maintenance and are therefore discouraged. Trees: Schinus molle..................................................................... California pepper tree Shrubs: Cassia nemophila. ........................................................................... Desert cassia Leucophyllum frutescens >Compacta=. .............................. Compact Texas ranger Salvia clevelandii...........................................................................Chaparral sage Salvia greggii..........................................................................................Red sage Accents: Euphorbia rigida ............................................................................. Gopher plant Muhlenbergia rigens............................................................................ Deer grass Penstemon spp (3). ..............................................................................Penstemon Groundcovers/ Vines: Calylophus hartwegii.......................................................................... Calylophus Dyssodia pentachaeta.................................................................Golden dyssodia Macfadyena unguis-cati. ................................................................. Catclaw vine Myoporum parvifolium. ....................................................... Prostrate Myoporum Oenothera caespitosa. ....................................................White evening primrose Oenothera stubbei...........................................................................Baja primrose Pentzia incana ....................................................................................Karoo bush 1. Creosote has low survivability. Use sparingly. 2. Use only container stock Ocotillo, not bare root. 3. Acceptable for use in seed mix

Use of Other Plant Species:

Native and drought tolerant plant species, other than those identified above, may be used with the approval of the Pima County Department of Transportation.



Plant Densities: Plant density will vary from project to project and from one location to another on an individual project. The space available for planting, the need for screening, annual maintenance considerations, and many other factors will impact the proposed plant densities. These issues not-withstanding, a reasonable range of plant densities is important to the Pima County Department of Transportation. Too few plants may result in a project that fails to achieve the goal of visual enhancement. Too many plants may result in an excessive irrigation water demand or may create an unnecessary requirement for maintenance. To avoid these potential problems the following plant densities are recommended. Roadways with Planted Roadsides and Medians: Trees ........................................................ 50-60 Trees per 1,000 LF of Roadway Shrubs ................................................250-300 Shrubs per 1,000 LF of Roadway Cacti and Accents ................25-30 Cacti and Accents per 1,000 LF of Roadway Roadways with Planted Roadsides Only: Trees ........................................................ 35-40 Trees per 1,000 LF of Roadway Shrubs ................................................175-225 Shrubs per 1,000 LF of Roadway Cacti and Accents ................15-20 Cacti and Accents per 1,000 LF of Roadway

Plant Sizes at Time of Installation:

A combination of plant sizes shall be utilized in conjunction with roadway landscape development projects. The use of various size plants as part of the initial installation will provide the intended visual enhancement within a reasonable period of time and at reasonable cost. The recommended distribution of plant sizes is as follows: Nursery Stock Trees 24" Box Size ..................................................................... 25% of Total Quantity 15 Gallon Container Size .................................................. 75% of Total Quantity Nursery Stock Shrubs 15 Gallon Container Size .................................................. 25% of Total Quantity 5 Gallon Container Size .................................................... 75% of Total Quantity Nursery Stock Accents 15 Gallon Container Size .................................................. 25% of Total Quantity 5 Gallon Container Size .................................................... 75% of Total Quantity

Salvaged Plant Material Trees, Shrubs, Cacti, Accents ...................................Various - Sizes as Salvaged



Plant spacing and setbacks:

The spacing between individual plants shall be sufficient to allow the plants to grow to a mature size that is normal for the subject species, with minimal pruning. Median trees shall be selected so that mature growth does not extend beyond the face of curb. No plantings shall occur in medians that are less than 6 feet wide from face of curbs. Avoid thorny plants near sidewalks. Roadside trees shall be offset from the right-of-way to provide access for maintenance. Plants to be set back from some utilities to provide access for vehicles. See Planting in the Vicinity of Utilities - this Section. Design intent should accommodate only one maintenance visit per year. Problem elements such as curb overhang or visibility problems will likely be removed, not tolerated. Design to avoid these maintenance problems. Minimum setback from face of curbs (median planting): Trees/ Large shrubs.........................................................................................6 ft. Small shrubs....................................................................................................3 ft. Accents and Cacti............................................................................................3 ft. Minimum setback from face of curbs (roadside planting):

Trees.................................................. Minimum 6 ft. - depends on Design Speed Shrubs .............................................................................................................4 ft. Accents and Cacti............................................................................................4 ft. Minimum setback from edge of sidewalk: Large Trees .....................................................................................................8 ft. Small or Upright Trees in areas of limited space ........................................ 4-6 ft. Shrubs .............................................................................................................4 ft. Accents and Cacti............................................................................................4 ft.



Planting within Sight Visibility Triangles:

Unobstructed Sight Visibility Triangles (SVT=s) shall be provided at all intersections as defined below. Plants installed within SVT=s shall have a mature height of less than thirty inches (18") or a branching height of greater than six feet (6'). SVT=s shall be shown on all landscape plans



Planting within Sight Visibility Triangles (Continued):

Planting within Sight Visibility Criteria for Pima County Department of Transportation projects makes the following assumptions: • Assumption 1: The roadway being designed has sufficient traffic volume to be a collector or arterial street and is considered the through traffic street • Assumption 2: The intersecting minor streets are controlled with stop signs. • Assumption 3: The through street and minor streets are perpendicular. Refer to guidelines provided in the latest edition of the AASHTO - A Policy on Geometric Design of Highways and Streets, (commonly referred to as the AGreen Book@) for placement of SVT's at intersections that do not meet the above criteria. SVT's begin with the positioning of a point that represents the eye of the driver (called the vertex or decision point in AASHTO's Green Book) in the vehicle making a turn on to the through traffic street from a minor street. This point shall be placed six feet (6') or half the lane width from the centerline of the minor street and eighteen feet (18') from the edge of the nearest travel lane on the through traffic street (Figure 2-2).

Figure 2.2 Locating the Vertex




The stem street side of the SVT is drawn parallel to the centerline of the minor street and begins at the point representing the eye of the driver. The length of the stem street side depends on the direction of approaching traffic. For near side SVT=s the stem street side extends to the centerline of the nearest travel lane of vehicles approaching from the left (Figure 2-3).

Figure 2.3 Locating Stem of Near Side Sight Triangle For far side SVT=s the stem street side extends to the centerline of the nearest travel lane of vehicles approaching from the right (Figure 2-4).

Figure 2.4 Locating Stem of Far Side Sight Triangle




The length of the near side and far side through street side of the SVT shall be as follows:

Design Speed of Through

Street (mph)

Crossing Distance (Number of lanes crossed

as part of turning movement)

Near Side Dimension

Along Through - Arterial Street

(Feet)

Far Side

Dimension Along

Through - Arterial Street

(Feet)

25 1-Lane 240

280

2-Lane NA

295

3-Lane/2-Lane & Median NA

315

30 1-Lane 290

335

2-Lane NA

355


375

35 1-Lane 335

390

2-Lane NA

415


440

40 1-Lane 385

445

2-Lane NA

475


500

45 1-Lane 430

500

2-Lane NA

530


565

50 1-Lane 480

555

2-Lane NA

590


625

Medians within a site visibility triangle must comply with the same restrictions. For a complete explanation of how these distances were derived refer to the 2001 AASHTO Green Book. Signalized intersections do not require SVT=s except if right turns on a red signal are permitted. In this case a near side SVT is necessary. Intersections with all-way stop control do not require SVT=s. However, it is required that corners be kept clear for pedestrian visibility.



Planting Adjacent to Sanitary Sewer Lines:

Plant locations should follow the most current landscape policies of the Pima County Wastewater Management Department. A current copy is included in Appendix A.

Planting Adjacent to Water Mains:

Plant locations should follow the most current landscape policies of the Water Company with jurisdictional authority in the project location.

Planting Adjacent to other Underground Utilities:

At the time of this writing, the Adry@ utilities (electric, phone, cable, fiber optics and gas) do not have specific landscape polices. Plants installed along arterial streets should be located where they will not cause damage to existing or proposed underground utility lines. Consideration should also be given to potential damage to the landscape plantings that could occur if it becomes necessary to maintain, excavate, expose, and repair underground lines. New or relocated underground utilities are commonly placed near the edge of the right-of-way on arterial roadway projects. The presence of underground utility lines should not preclude appropriate landscape development. At times it is not possible to avoid all planting in the vicinity of underground utilities. In such cases, the potential need to remove and replace a single plant or group of plants to allow for utility line maintenance, is an acknowledged risk. Coordinate the location of utility cabinets and transformers, especially at major intersections, and provide screening.

Planting Adjacent to Overhead Electric/Telephone CATV Lines:

Trees should be located to prevent future conflicts with overhead electric, telephone, and/or cable television lines. Plants installed in the vicinity of overhead lines should have a natural mature height, or a mature height that can be maintained with minimal pruning, that will not be in conflict with the overhead utility line. Show the existing and proposed overhead utility line CAD files on landscape drawings during design. Select tree species that have been approved by Tucson Electric Power Company for use under overhead power lines.

Planting in the Vicinity of Street Signage:

Locate plants in areas where the mature size will not obstruct traffic control or street name signage to minimize conflicts. Show the signage CAD layer on landscape drawings during final design so conflicts can be avoided.



Plant Installation Details: Environmental coordination Environmentally Sensitive Roadway (ESR)

Install all plants in accordance with the Recommended Details included in this Guideline. See Appendix B. Requirements for tree staking should be determined for each species and size of tree installed. Staking should be avoided when possible. Utilize tree staking where additional support is required and where it will facilitate the development of upright plant specimens as may be necessary for median and roadside installations. Plants and features required by permit (such as 404c permit areas) shall be so labeled on the plan to facilitate PCDOT Field Engineering’s coordination. Typically the plants shown on the plan as required by permit can not be moved/removed unless dead. 404 limits shall be legibly identified on the landscape plans. If the roadway is a designated Environmentally Sensitive Roadway (ESR), the native plant inventory and mitigation requirements are determined by Chapter 4 of the Roadway Design Manual. Consult RDM Appendix 4-D. This document presents a set of landscape guidelines in Appendix 4-F. These guidelines should be critically evaluated before use since some of that information directly contradicts this more current guideline.



Grading:

Water Harvesting in Medians: In locations where there is sufficient space to allow landscape plantings and the area has gentle slopes, the median shall be graded to provide swales and basins to collect stormwater in coordination with the engineer=s drainage plans. The grading plan shall include an overflow system to allow excess flow to enter the roadway stormwater system.



Grading (Continued):

Water Harvesting in Medians, continued:

Notes: 1. Check Dam spacing will depend on the overall slope of the median. 2. Sections need to be cross referenced with Engineering Typical Sections.




Roadside Cut and Fill Slopes: In locations where there are steep cut or fill slopes, the landscape architect shall work with the engineer to minimize visual impact with appropriate treatments. For slopes that are 2:1 or steeper: Recommended erosion control treatments: $ Seeding $ Sediment wattles $ Biodegradable mats $ Bonded fiber matrix $ Benching slopes (a.k.a. Mini-benching) $ Dumped riprap $ Hand-placed riprap on erosion control fabric $ A combination of treatments Aesthetic considerations to be implemented by the landscape architect: $ Choose color, size and texture of riprap to complement the landscape and

hardscape features. $ Provide plantings at the base of slope, where feasible. $ Add benches or planting pockets on slope if irrigation can be provided

without affecting the integrity of the slope. Consider the erodibility of the soil and the potential for disturbance by the maintenance crew when placing benches or pockets.

For slopes 2:1 to 3:1 Recommended erosion control treatments: $ Seeding $ Container plantings $ Biodegradable mats where necessary $ Riprap in areas highly susceptible to erosion $ Benching slopes (a.k.a. Mini-benching) Aesthetic considerations to be implemented by the landscape architect: $ Choose color, size and texture of riprap to complement the landscape and

hardscape features. $ Provide plantings to minimize visual impact. Drainage Swales: Include designed drainage swales when appropriate or required.




Coordinate with engineer to provide the most aesthetically pleasing and maintenance free options. Use wider channels with more gentle side slopes, where possible. Identify project specific maintenance requirements and include maintenance requirements in the Special Provisions for the project.

Berms: In locations where there is sufficient space, include berms with basins and swales to add interest to median and roadside landscape areas. All landscape grading that involves stormwater collection systems shall be coordinated with Engineering drainage plans. Berms shall have a maximum slope of 4:1.

Erosion Control:

Seeding: Use seeding for erosion control when appropriate, or required. Select native grasses for their ability to persist in the specific environmental circumstances used. Provide temporary irrigation only in extreme situations where the soil is unstable and needs immediate cover, as determined by the PCDOT. Consider the timing of application and the possibility of using dual applications to take advantage of summer and winter rainy periods. Monitor during the first growing season, possibly longer to ensure good establishment and elimination of weed species. Identify project specific maintenance requirements and include maintenance requirements in the Special Provisions for the project.

Erosion Control Fabric: Use erosion control fabric in conjunction with seeding to protect soil from erosion before plants are established and to provide a more suitable environment for seedling germination. Use on slopes 3:1 or steeper or when soils are highly erodible.



Erosion Control (Continued):

Rip Rap: Choose color, size and texture to complement the landscape and hardscape features. Other Methods: Use Bonded fiber matrix on rocky or uneven slopes, or steep slopes where truck spray application is accessible. Use Mini benching in rural areas or large cut slopes to aid the establishment of the seed mix. Consult the Arizona Department of Transportation’s (ADOT) Erosion Control Manual for a thorough explanation and discussion of these and other potentially applicable erosion control techniques.

Inorganic Surfacing:

Decomposed Granite: Size shall be 1” minus. (Coverage of 1” minus will be approximately 100 square feet per ton, at two inches depth.) Use decomposed granite to provide a consistent ground plane that accentuates landscape plants. Color of decomposed granite should blend with or contrast with existing/new surfaces, features and walls. In locations where the distance between the edge of the roadway pavement or back of curb and the sidewalk or multi-use path is less than 8 feet, the area should be surfaced with compacted decomposed granite or decomposed granite stabilized with a soil binder such as Stabilizer, Nbind or Polypave. Size shall be 3/8” minus.

Median Nose Paving: The ends of noses of medians shall be paved with integrally colored precast concrete unit pavers or integrally colored, textured poured-in-place concrete. Pavers shall be installed on a compacted sand setting bed. Utilize the same pattern for all medians associated with a specific arterial street. The typical length of the paved portion of the median shall be 160 feet or determined by the length of the turn lanes.



Maintenance considerations

In locations where the turn bay is less than 160 ft., the pavement should extend to a point where the width of the median widens to approximately six feet (6'). A poured-in-place concrete header shall be utilized where a curb is not present to contain the precast concrete unit pavers. Design to accommodate a maximum maintenance regime of one visit per year. Maintenance will remove problems and not tolerate them. Consider using slow-growing plants in medians and sidewalk areas Eliminate one gallon shrubs and vines Strive to provide a clean smart design that anticipates and deals with problems during design rather than during construction or maintenance.

Irrigation Guidelines

Part 3: Irrigation Guidelines


General Requirements:

All Pima County transportation improvement projects shall include an automatic, drip irrigation system. The irrigation system will facilitate the establishment and on-going maintenance of the landscape plantings. Design the automatic drip irrigation system to be a permanent system to operate for a period of 15 to 20 years without replacement. Install a temporary spray irrigation system as part of arterial street development, if needed. This temporary system will facilitate the germination and establishment of plants within seeded areas. Typically, spray irrigation systems will be used in localized areas only, where plant establishment is important to prevent soil erosion. The need for a temporary spray irrigation system will be determined on a case-by case basis by the Pima County Department of Transportation (PCDOT) Engineer.

Water Sources:

Use the type of water identified by the water department with jurisdictional authority in the project location for irrigation on arterial street projects. Use reclaimed wastewater (treated effluent) or other renewable water source(s), whenever feasible. Design the irrigation system to allow for future conversion to reclaimed water if it is necessary to utilize potable water for irrigation on an interim basis.

Cross-Connection Control:

Provide cross connection control in all locations where arterial street irrigation systems connect to potable water mains. Install reduced pressure backflow preventers at all points of connection. Install backflow preventers as detailed in these Guidelines and test in accordance with utility requirements for the appropriate jurisdiction.

Irrigation System Hydraulic Design Standards: System Expansion/ Modification: Water Velocities:

All irrigation systems associated with PCDOT roadway improvements projects shall be designed to meet the American Society of Irrigation Consultant=s Standards for Landscape Irrigation, most recent edition, or as required to meet these guidelines. Where there is conflict between the two standards, the more stringent requirement shall apply. Design to allow for a system expansion of up to twenty percent (20%). Consider meter and backflow preventer size, mainline pipe size, and irrigation controller capacity when providing for future system expansion.


Pima County Department of Transportation - Landscape and Irrigation Development Standards 3-2

Pressure Differential in Irrigation Lateral Zones: System Layout:

Design to provide for pipeline water velocities that are less than five feet per second (5 ft./sec). Design to ensure that the difference in pressure at the applicator (drip emitter, temporary spray head, etc.) furthest from the water source is not more than 20% less than the pressure at the applicator closest to the water source. The layout of each system will be influenced by the site conditions associated with the particular arterial street segment. System layouts shall comply with the following: Provide separate zones for the irrigation of trees and for the irrigation of shrubs and other plants. Use a single system in some cases where the shrubs and accent plants are large and drought tolerant enough to be combined on the tree valves. Use of this type of irrigation system will be determined on a case-by-case basis by the Pima PCDOT Engineer. Provide direct line-of-sight between the controller and the irrigation zones operated by the controller, to the extent feasible. Install all meters, backflow preventers, mainlines and remote control valves on one side of the street, to the extent feasible. Extend lateral lines through sleeves below the roadway pavement to the median (where applicable) and to the opposite side of the roadway. The length of a roadside area irrigated by a single remote control valve shall be limited to approximately one thousand linear feet (1000'). This dimension may be adjusted to allow for the use of side streets as boundaries or limits for individual control zones. Show power drop on the irrigation plans at location coordinated with Electrical Engineer. Locate irrigation controllers near intersection where power supply is available.



System Layout, Continued:

The layout and configuration of each zone shall be as shown in Figure 3.1.

Figure 3.1 Typical Valve Layout



Irrigation Material and Equipment Guidelines:

System Component

Material / Type

Manufacturer / Model

(See Note 1)

Recommended or

Required (See Note 2)

Backflow Preventer

Reduced Pressure Type

Febco Model 825-Y

Recommended

Backflow Preventer Security Enclosure

Lockable, Open Mesh, Painted Steel Type

Guardshack Color: tan

Recommended

Backflow Preventer Frost Guard

Sized per BPD and Security Enclosure

FrostGuard

Recommended

Controller

Stand alone controller in metal cabinet

Irritrol MC Elite Series

Required

Controller Security Cabinet

Cold-Rolled Steel, Free-Standing, Lockable

LeMeur Model LE-A-CR

Recommended

Master Valve

Normally-closed, 24 V Solenoid Type

Buckner Model VB Series

Required

Remote Control Valves

24 V Solenoid Type w/ H.D. Plastic Body

Rain Bird Model PESB Series

Required

Gate Valves (2" and larger)

Brass body with non-rising stem

Watts Model WGV

Recommended

Ball Valves 1-1/2" and smaller

Brass body, full-port ball valve

Watts Model FBV

Recommended

Mainline Pipe

Schedule 40 PVC Pipe

Various Manufacturers

Required

Lateral Line Pipe



Required



Irrigation Material and Equipment Guidelines, Continued:

System Component

Material / Type


(See Note 1)

Recommended or


Pipe Fittings - Mainline and Lateral Line Pipe

Schedule 40 PVC Fittings


Required

Pipe Fittings for Remote Control Valve Assemblies

Schedule 80 PVC Fittings


Required

Pipe Sleeves under Pavement - Size: 6" unless noted



Required

Pressure Regulating Valves

In-Line, Permanently Assembled Type

Senninger PR 30

Recommended

In-Line Screen Filters

In-Line Filter with Removable Screen

Agricultural Products Model 4E Series

Recommended

Drip Emitters - Multi-Outlet - 6

Permanently Assembled, Pressure Compensating

Rain Bird Model XBT -10-6

Required

Drip Emitters - Multi-Outlet - direct burial


Bowsmith Model ML 200 Series

Required

Drip Emitters - Single Outlet


Rain Bird Model XBT -10 -PC

Only when necessary



Irrigation Material and Equipment Standards, Continued

Notes: 1. Partial model numbers provided. Add size and other information as-needed. 2. Item is required to comply with PCDOT Standards and/or to be compatible

with existing systems. 3. Other equipment may be used to meet special project requirements with the

approval of the PCDOT Engineer. 4. Projects within the City of Tucson limits shall use City of Tucson equipment

list. Wire Sizing:

Specify sizes for low voltage control wiring between the controller and remote control valves as follows: 12 gauge (minimum) for common wires and 14 gauge (minimum) for control wires. For all wire runs in excess of 500 feet, check required wire sizes with the controller and remote control valve manufacturer=s published recommendations and increase wire size if necessary.

System Component

Material / Type


(See Note 1)

Recommended or


Emitter Distribution Tubing

UV resistant polyvinyl material. O.D.=0.22" I.D.=0.16"

Rain Bird Model DT-025

Recommended

Valve Access Boxes

Heavy-Duty Reinforced Plastic with Bolt-Down Lids

NDS Color: tan or purple for reclaimed water

Required

Low Voltage Control Wire

Type UF, 12 or 14 Gauge with Solid Copper Core


Required

Detectable Marking Tape

Color coded plastic tape with detachable metal foil core

T. Christy Enterprises Model DT-3"-G-I.

Recommended



Wire Sizing, Continued Installation Details:

Control wire size SIZE 4 6 8 10 12 14

4 24,000 18,461 13,333 9,600 6,522 4,332 6 18,462 15,000 11,429 8,571 6,030 4,110 8 13,333 11,429 9,231 7,273 5,357 3,785 10 9,600 8,571 7,278 6,000 4,633 3,409 12 6,522 6,030 5,357 4,633 3,774 2,920 14 4,332 4,110 3,785 3,409 2,920 2,381

Install all irrigation in accordance with the Recommended Details included in these Guidelines. (Appendix C).

Appendix A: WWM Landscape Policies

Appendix B:

Recommended Planting Details

L-100MO/YR

04/08 PLANTING/SALVAGEDNATIVE PLANTS:

TREE PLANTING - BOXEDSALVAGED SPECIMEN

SCALE: N.T.S.DETAIL NO.

REVISED:

ISSUED: RECOMMENDED DETAIL

11 OFSHEET

L-101MO/YR

04/08 PLANTING / NURSERYSTOCK:

TREE PLANTING -24" BOX & 15 GAL. SIZE


REVISED:


11 OFSHEET

L-102MO/YR


TREE STAKING -MULTI-TRUNK


REVISED:


11 OFSHEET

L-103MO/YR


BROWSER CAGE FOR TREES


REVISED:


11 OFSHEET

L-104MO/YR


SHRUB / GROUND COVERPLANTING - 1, 5 & 15 GAL. SIZE


REVISED:


11 OFSHEET

L-105MO/YR


PRICKLY PEAR & CHOLLA CACTUS PLANTING (CONTAINER GROWN)


REVISED:


11 OFSHEET

L-106MO/YR

04/08 PLANTING / SALVAGEDNATIVE PLANTS:OCOTILLO PLANTING - SALVAGED SPECIMEN


REVISED:


11 OFSHEET

L-107MO/YR

04/08 PLANTING / SALVAGEDNATIVE PLANTS:

SAGUARO PLANTING - SALVAGEDSPECIMEN (≤8')


REVISED:


11 OFSHEET

L-108MO/YR

04/08 PLANTING NURSERYSTOCK:

TREE PLANTING -30" & LARGER BOX SIZE


REVISED:


11 OFSHEET

L-109MO/YR


TREE PLANTING - HARD SOILCONDITIONS

24" BOX & 15 GAL. SIZE


REVISED:


11 OFSHEET

L-110MO/YR


SHRUB PLANTING - BOXEDSALVAGED SPECIMEN


REVISED:


11 OFSHEET

L-111MO/YR


SHRUB / GROUND COVER - HARDSOIL CONDITIONS

PLANTING - 1, 5 & 15 GAL. SIZE


REVISED:


11 OFSHEET

L-112MO/YR


YUCCA PLANTING -SALVAGED SPECIMEN


REVISED:


11 OFSHEET

L-113MO/YR


SAGUARO PLANTING - SALVAGEDSPECIMEN (≥8')


REVISED:


11 OFSHEET

L-114MO/YR


PRICKLY PEAR AND CHOLLA CACTUS PLANTING - SALVAGED CUTTING


REVISED:


11 OFSHEET

L-115MO/YR


BARREL AND COLUMNAR CACTUSPLANTING - CONTAINER GROWN


REVISED:


11 OFSHEET

L-116MO/YR


BARREL AND COLUMNAR CACTUSPLANTING - SALVAGED SPECIMEN


REVISED:


11 OFSHEET

L-117MO/YR


STEM SUCCULENT PLANTING -CONTAINER GROWN


REVISED:


11 OFSHEET

L-118MO/YR


STEM SUCCULENT PLANTING -SALVAGED SPECIMEN


REVISED:


11 OFSHEET

L-119MO/YR


SAGUARO PLANTINGLARGE SALVAGED SPECIMEN

OVER 8'


REVISED:


11 OFSHEET

Appendix C: Recommended Irrigation Details

I-100MO/YR

04/08 IRRIGATION:REDUCED PRESSURE PRINCIPLE BACKFLOW

PREVENTER IN SECURITY ENCLOSURE


REVISED:


11 OFSHEET

I-101MO/YR

04/08 IRRIGATION:IRRIGATION CONTROLLER

IN FREE STANDING SECURITY ENCLOSURE


REVISED:


11 OFSHEET

I-102MO/YR

04/08 IRRIGATION:MASTER VALVE ASSEMBLY


REVISED:


11 OFSHEET

I-103MO/YR

04/08 IRRIGATION:MAINLINE ISOLATION

(BALL) VALVE(12" TO 1 12" SIZE)


REVISED:


11 OFSHEET

I-104MO/YR

04/08 IRRIGATION:PIPE TRENCHING AND BACKFILL

- MAINLINES, LATERALS & MARKING TAPE


REVISED:


11 OFSHEET

I-105MO/YR

04/08 IRRIGATION:SLEEVE UNDER STREET OR

PARKING LOT


REVISED:


11 OFSHEET

I-106MO/YR

04/08 IRRIGATION:

SLEEVE UNDER WALKWAY OR SHARED USED PATH


REVISED:


11 OFSHEET

I-107MO/YR

04/08 IRRIGATION:REMOTE CONTROL VALVE

ASSEMBLY - DRIP ZONE


REVISED:


11 OFSHEET

I-108MO/YR

04/08 IRRIGATION:

MULTI OUTLET EMITTER - SIX OUTLET


REVISED:


11 OFSHEET

I-109MO/YR

04/08 IRRIGATION:EMITTER DISTRIBUTION TUBING

LAYOUT AT TREE - SIX OUTLET


REVISED:


11 OFSHEET

I-110MO/YR

04/08 IRRIGATION:

EMITTER DISTRIBUTION TUBING LAYOUT AT SHRUBS


REVISED:


11 OFSHEET

I-111MO/YR

04/08 IRRIGATION:

EMITTER LINE FLUSH CAP IN ACCESS BOX


REVISED:


11 OFSHEET

I-112MO/YR

04/08 IRRIGATION:MAINLINE FILTER & REMOTE

CONTROL FLUSH VALVE ASSEMBLY


REVISED:


11 OFSHEET

I-113MO/YR

04/08 IRRIGATION:

MULTIPORT EMITTER DIRECT BURIAL


REVISED:


11 OFSHEET

I-114MO/YR

04/08 IRRIGATION:

SINGLE OUTLET EMITTER


REVISED:


11 OFSHEET

I-115MO/YR

04/08 IRRIGATION:

REMOTE CONTROL VALVESPRAY ZONE


REVISED:


11 OFSHEET

I-116MO/YR

04/08 IRRIGATION:

QUICK COUPLING VALVE ASSEMBLY


REVISED:


11 OFSHEET

I-117MO/YR

04/08 IRRIGATION:MAINLINE ISOLATION

(GATE) VALVE(2" TO 4" SIZE)


REVISED:


11 OFSHEET

I-118MO/YR

04/08 IRRIGATION:

IRRIGATION CONTROLLER INTERIOR WALL MOUNTED


REVISED:


11 OFSHEET

I-119MO/YR

04/08 IRRIGATION:IRRIGATION CONTROLLER IN WALL MOUNTED SECURITY ENCLOSURE


REVISED:


11 OFSHEET

I-120MO/YR

04/08 IRRIGATION:

FLOW SENSOR ASSEMBLY


REVISED:


11 OFSHEET

Appendix D: Typical Special Provisions


SECTION 802 LANDSCAPE GRADING

Editing Note: Review and edit all highlighted text as appropriate for this project. Select alternate paragraph(s) where applicable. Provide additional information as required for specific project.

The following portions of Section 802 (LANDSCAPE GRADING) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 802-1 DESCRIPTION (Adding)

The work under this section shall consist of fine grading, contouring, smoothing, or otherwise shaping of landscaped areas. Included shall be: all areas to be seeded, all areas to receive decomposed granite or other aggregate surfacing, and all designated raked-earth areas.

802-3 CONSTRUCTION DETAILS (Adding)

All project areas to be seeded, to be surfaced with decomposed granite surfacing, or to be left as raked earth areas shall be graded as required to provide a generally smooth appearance conforming to the shapes and cross sections indicated on the project plans. The final surfaces shall be raked. All objectionable materials, trash, brush (not-designated to be preserved-in-place), weeds, and stoned larger than two inches (2") in diameter shall be removed from the site and disposed of in an off-site location.

802-4 METHOD OF MEASUREMENT Landscape grading will be measured by the square yard of landscaped area actually graded. 802-5 BASIS OF PAYMENT

The accepted quantities of landscape grading, measured as provided for above, will be paid for at the contract unit price per square yard including in the Bidding Schedule.


SECTION 803 LANDSCAPE BORROW AND PLATING MATERIAL


The following portions of Section 803 (LANDSCAPE BORROW AND PLATING MATERIAL) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 803-2 MATERIALS 803-2.02 Decomposed Granite (Adding)

The decomposed granite shall be screened to remove all particles larger than one inch (1" minus gradation). The color of the decomposed granite shall be “Desert Gold” as provided by Kalamazoo Materials, or other approved. The Contractor shall submit a 0.25 cubic foot sample for approval prior to the delivery and/or installation of decomposed granite on the project site.

803-2.03 Rock Mulch - Native Stone Rip-Rap (Adding)

The rock mulch shall be angular, fractured rock material and shall be 4" to 10" size. The material shall be screened to remove rock smaller than 4" and larger than 10". Rock mulch color shall be “Apache Brown” as supplied by Kalamazoo Materials, or approved equal. The Contractor shall submit a 1.0 cubic foot sample of the rock mulch for approval prior to the delivery and/or installation of rock mulch material on the project site.

803-2.04 Pre-Emergent Herbicide (Adding)

Pre-emergent herbicide shall be “Surflan” or approved equal. The Contractor shall submit copies of the manufacturer’s product data for the herbicide prior to its delivery and/or application on the project site.

803-3 CONSTRUCTION DETAILS 803-3.02 Decomposed Granite (Adding)

The decomposed granite shall not be placed until the subgrade has been brought to the lines and grades shown on the project plans and details and accepted by the Engineer. Prior to placing the decomposed granite, the subgrade shall be treated with pre-emergent herbicide. The depth of the decomposed granite after water settling, leveling, and compaction shall not be less than two inches (2").

803-3.03 Rock Mulch - Native Stone Rip-Rap (Adding)

The rock mulch (native stone rip-rap) shall not be placed until the subgrade has been brought to the lines and grades shown on the project plans and details and accepted by the Engineer. Prior to placing the rock mulch, the subgrade shall be treated with pre-emergent herbicide. Rock mulch (native stone rip-rap) shall be hand placed to minimize the voids between adjacent stones and to present a uniform surface. Rock mulch installation shall be as approved by the Engineer.


803-3.04 Pre-Emergent Herbicide (Adding)

The pre-emergent herbicide shall be applied by an Arizona licensed applicator. Site and atmospheric conditions at the time of installation, and procedures for applying the pre-emergent herbicide shall be in accordance with the manufacturer’s written instructions and in accordance with applicable state and federal regulations.

803-4 METHOD OF MEASUREMENT 803-4.01 Decomposed Granite (Adding) Decomposed granite will be measured by the ton (dry weight), complete in-place. 803-4.02 Rock Mulch - Native Stone Rip-Rap (Adding) Rock mulch will be measured by the ton, complete-in-place. 803-5 BASIS OF PAYMENT 803-5 Basis of Payment

The accepted quantities of decomposed granite, measured as provided for above, will be paid for at the contract unit price included in the Bidding Schedule.

The accepted quantities of rock mulch (native-stone rip-rap), measured as provided for above, will be paid for at the contract unit price included in the Bidding Schedule.


SECTION 805 SEEDING


The following portions of Section 805 (SEEDING) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 805-1 DESCRIPTION (Adding)

The work covered by this section shall include the preparation of soil within areas to be seeded, the (Class II) hydroseeding of disturbed area with native plants, and (in designated areas) the installation of a temporary, degradable erosion control blanket.

805-2.08 Hydroseed Mix (Adding) The hydroseed mix shall include the following components: Item: Application Rate (Per Acre):

Native Plant Seed Lbs. of Pure Live Seed (PLS) per acre for each Plant

Species as listed on the project plans.

Wood Fiber Mulch 2000 Lbs. per acre

Ammonium Phosphate 200 Lbs. per acre (16-20-0) Fertilizer 805-2.09 EROSION CONTROL BLANKET (Adding)

Erosion control blanket shall be of the biodegradable blanket type. The blanket shall be a machine produced mat of straw or wood excelsior fiber covered on the top and bottom sides with photo degradable extruded plastic or woven biodegradable nettings having maximum openings of 0.5" x 1.0". Erosion control blanket shall have a functional longevity of 10 months. Erosion control blanket shall be as manufactured by North American Green, Model S150, or approved equal.

805-3.03 HYDROSEEDING (Adding)

Hydroseeding shall occur twice within the first year. The first hydroseed application will occur when the construction schedule can allow it. A second trip is necessary, and shall be scheduled to take advantage of seasonal benefits (approximately 6 months after the first application, and not more than one year after first application). This second trip will focus on applying the same amount of hydroseed as was applied the first time. However, the location of the second application shall be directed by the Engineer, and shall focus on areas with little to no seed mix germination or otherwise unacceptable areas.


805-3.05 EROSION CONTROL BLANKET (Adding)

Upon completion of the hydroseeding operations the erosion control blanket shall only be installed over those seeded areas that are indicated on the landscape plans to receive erosion control blanket. The blanket shall be installed as detailed on the project plans and per the manufacturer’s written instructions and recommendations. The blanket shall be installed as soon as possible after seeding. The Contractor shall be responsible for reseeding any seeded areas disturbed by the installation of the blanket or that erode prior to the installation of the blanket.

805-4 METHOD OF MEASUREMENT (Revised)

Seeding (Class II) will be measured by the square foot, complete-in-place. Erosion Control Blanket will be measured by the square foot, complete-in-place.

805-5 BASIS OF PAYMENT (Revised)

Accepted quantities of seeding, measured as provided for above, will be paid for at the contract unit price per square yard listed in the Bidding Schedule.

Accepted quantities of erosion control blanket, measured as provided for above, will be paid for at the contract unit price per square foot listed in the Bidding Schedule.


SECTION 806 TREES, SHRUBS, AND PLANTS


The following portions of Section 806 (TREES, SHRUBS, AND PLANTS) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 806-1 DESCRIPTION (Adding)

The work under this section shall consist of furnishing and planting trees and shrubs as designated on the project plans. The work shall include the delivery, storage, and handling of plants and other landscape materials, the excavation and backfill of plant pits, the watering, staking, guying and pruning of plants, cleanup of the work area, disposal of unwanted or deleterious materials, and initial care and maintenance of landscape improvements all in accordance with the details shown on the project plans and the requirements of the Specifications.

806-2.02 NURSERY STOCK (Adding)

Some plant material called for on the plans must be acquired through the Pima County native plant nursery (commonly known as “Sweetwater nursery”), currently located at 3145 W. Camino del Cerro. The contractor shall arrange for pickup from this site and delivery to the site. The contractor must notify Sherrie Barfield at Pima County Natural Resources Parks and Recreation (520-887-6270) one month prior to the pickup date.

Pima County Native Plant Nursery will not warranty the plants provided. The landscape contractor has the option to refuse selected plants from the Native Plant Nursery stock due to ill health or poor form or other specific reason. Once the Native Plant Nursery plants are delivered and accepted by the contractor, the contractor bears responsibility for the survival and health of that plant, and shall replace it if it dies. Pima County Native Plant Nursery has historically provided high quality plant material, but due to the demands of multiple ongoing projects plants are not held in reserve at the nursery.

All plant containers that are salvageable shall be returned to the native plant nursery 806-2.02 (A) Plant Size (Adding)

All trees provided as part of this project shall meet the minimum size standards of the “Arizona Nursery Association Growers Committee Recommended Tree Specifications.” Plants which do not meet these size specifications will be rejected by the Engineer.

806-2.02 (B) Branch Clearance for Trees (Adding)

All trees planted as part of this project located within ten feet (10') of a sidewalk or multi-use path shall be single trunk, or upright multi-trunk specimens with a minimum clearance of five (5) feet measured from the final finish grade at the base of the trunk to the lowest branch of the tree. Trees that do not meet this requirement shall not be planted in the locations noted.


Alternate Paragraph: Use “Prepared Soil” in most instances. Use “Prepared Topsoil” when on-site soil conditions are poor. Delete unused paragraph.

806-2.05 Prepared Topsoil (Adding)

The material used for the backfill of tree and shrub plant pits shall be “Prepared Topsoil” as defined by the Standard Specifications for Public Improvements (most recent edition). The Prepared Topsoil is referred to on the project plans as “prepared soil backfill.” In addition to the materials listed in the standard specifications, the prepared soil shall also include three (3) lbs. of fertilizer per cubic yard of prepared material. Fertilizer shall be Ammonium Phosphate (16-20-0).

The soil material used for the backfill of cacti and ocotillo plant pits shall be as noted on the project plans.

806-2.06 Prepared Soil (Adding)

The material used for the backfill of tree and shrub plant pits shall be “Prepared Soil” as defined by the Standard Specifications for Public Improvements (most recent edition). The Prepared Soil is referred to on the project plans as “prepared soil backfill.” In addition to the materials listed in the standard specifications, the prepared soil shall also include three (3) lbs. of fertilizer per cubic yard of prepared material. Fertilizer shall be Ammonium Phosphate (16-20-0).

The soil material used for the backfill of cacti and ocotillo plant pits shall be as noted on the project plans.

806-2.09 Chemical Fertilizer (Adding)

Fertilizer for prepared soil shall be Ammonium Phosphate (16-20-0) commercial fertilizer in pelleted or granular form and of recent manufacture. It shall be delivered to the site in original, unopened containers bearing the manufacturer's guaranteed statement of analysis.

806-3.01 Planting Season (Adding)

Within the overall project phasing and completion requirements, the schedule for planting of trees and shrubs shall be at the discretion of the Contractor. Planting during extremely cold, hot, or windy periods shall be performed at the Contractor's risk. Plants which are damaged or die prior to Final Acceptance as a result of extreme weather conditions, shall be removed and replaced by the Contractor at no additional cost to the Owner.

806-3.02 Excavation (Adding)

The Contractor shall request that the project site be blue-staked prior to the start of any plant pit excavation work. Blue staking shall be kept current during the course of the project. All utilities damaged by the Contractor shall be repaired or replaced by the Contractor, as required by the Owner or appropriate utility company, at the Contractor’s expense.

806-3.04 (B) Nursery Stock (Adding)

Backfill material shall be Prepared Soil conforming to the requirements of Subsection 806-2.06 with the addition of fertilizer as specified herein. Backfill material placed below the root ball of the new plants


shall be water settled and adequately tamped to prevent settlement after plant installation and irrigation system operation.

806-3.05 Pruning and Staking (Adding)

All 24" box size trees shall be staked as detailed on the project plans and as specified.

All 15 gallon container size trees shall NOT be staked except as may be noted on the project plans or as directed by the Engineer. In instances where staking is required, the work shall be performed as detailed on the project plans and as specified.

All salvaged specimen trees shall NOT be staked except as may be noted on the project plans or as directed by the Engineer. In instances where staking is required, the work shall be performed as detailed on the project plans and as specified.

All trees shall be pruned as-needed prior to the start of the Landscaping Establishment Period. Pruning work shall be performed in accordance with ANSI-A-300-1995.

806-4 METHOD OF MEASUREMENT (Adding)

Planted trees, shrubs, cacti, and other plants will be measured on a per each basis for each type and size of plant listed in the Bidding Schedule, complete-in-place.

Tree staking will be measured on a per each tree staked basis, complete-in-place. Staking will be measured independently of tree planting.

806-5 BASIS OF PAYMENT (Adding)

The accepted quantities of each size and type of tree, shrub, cacti, and other plant, measured as provided for above, will be paid for at the contract unit prices identified in the Bidding Schedule.

The accepted quantities of trees staked, measured as provided for above, will be paid for at the contract unit price included in the Bidding Schedule.


SECTION 807 LANDSCAPING ESTABLISHMENT


The following portions of Section 807 (LANDSCAPING ESTABLISHMENT) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 807-3.01 General (Adding)

The landscaping establishment period shall be three hundred and sixty-five (365) consecutive calendar days.

The Prime Contractor (or the Landscape/Irrigation Subcontractor responsible for the initial installation) shall be the only contractor that performs the Landscaping Establishment work. Subcontracting of this work will not be permitted except for weed eradication with herbicides, because of special licensing requirements.

Water used during project construction and the Landscaping Establishment period shall be paid for by the Contractor as specified in Section 8.08-3.09.


SECTION 808 LANDSCAPE IRRIGATION SYSTEM


The following portions of Section 808 (LANDSCAPE IRRIGATION SYSTEM) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 808-2.01(B) PVC Pipe (Adding)

All main line pipe shall be Schedule 40 PVC pipe and shall comply with the requirements of ASTM D 1785.

All lateral line pipe shall be Schedule 40 PVC pipe and shall comply with the requirements of ASTM D 1785.

All PVC sleeving shall be Schedule 40 PVC pipe and shall comply with the requirements of ASTM D 1785.

Primers for use in conjunction with PVC pipe solvent weld connections shall comply with the requirements of ASTM F 656. Primer shall be as manufactured by IPS Weld-On, Type P-70 or approved equal.

Solvent weld cement used for making PVC connections shall comply with ASTM D 2564. The type and set-up time shall be as recommended by the manufacturer for the class, schedule and size of pipe being joined. Solvent weld cement shall be as manufactured by IPS Weld-On, Type 711, or approved equal.

Plastic pipe shall be delivered to the site in unbroken, banded or tied bundles, and shall be so packaged as to prevent damage to pipe barrels or ends. If pipe is delivered from a local warehouse the pipe need not be bundled or wrapped.

Upon delivery to the site, the Contractor shall inspect all pipe for possible shipping damage. All damaged pipe shall be immediately removed from the project site. Plastic pipe shall be handled and stored in accordance with the manufacturer’s written instruction and recommendations.

808-2.01 (C) PVC Fittings (Adding)

PVC fittings shall be made from Type I, Grade I, PVC compounds. Fittings shall be installed in accordance with the manufacturer's recommendations and these Specifications.

Solvent weld fittings for main line (pressurized) pipe shall be Schedule 40 PVC and shall comply with the requirements of ASTM D 2467.

Solvent weld fittings for lateral line pipe shall be Schedule 40 PVC and shall comply with the requirements of ASTM D 2466.


Threaded PVC fittings and fittings used in the construction of remote control valve assemblies shall be Schedule 80 PVC fittings and shall comply with the requirements of ASTM D 2464.

808-2.03 Gate Valves (Adding)

Gate valves shall be constructed with a brass body and non-rising stem. Gate valve shall have FPT threaded inlet and outlet and shall be equipped with a handwheel. Gate valves shall be as manufactured by Watts. Model WGV, or approved equal. Valve size shall be as noted or, if not noted, incoming line size. Gate valves shall be used for mainline (and remote control valve assembly) isolation valves that are 2" size and larger.

808-2.03(A) Ball Valves (Adding)

Ball valves shall be constructed with a brass body, stainless steel ball, and FPT threaded ends. Ball valves shall be equipped with a handle with a 90 degree swing for full closure and opening of the valve. Ball valves shall be as manufactured by Watts, Model FBV Series, or approved equal. Valve size shall be as noted, or of not noted, incoming line size. Ball valves shall be used for mainline (and remote control valve assembly) isolation valves that are 1-1/2" size and smaller.

808-2.04(A) Electric Remote Control Master Valve (Adding)

The Master Valve shall be of the electric remote control valve type. The valve shall have a normally closed configuration. The valve shall have a brass body with threaded (FPT) inlet and outlet. The valve shall be equipped with a contamination proof, self-flushing screen. The Master Valve shall be as manufactured by Buckner, Model VB-series, or approved equal.

808-2.04(B) Electric Remote Control Valve Assembly for Spray Zones (Adding)

Remote control valve assemblies for (temporary) spray zones shall consist of a ball valve (or gate valve for sizes 2" and larger), electric remote control valve, access box, and related fittings.

Electric remote control valves shall be constructed of heavy duty glass-filled nylon and shall be pressure rated to 200 pounds per square inch. Valve shall be as manufactured by Rain Bird, Model PESB Series, or approved equal. Valve size shall be as noted on the project plans.

Ball valves shall be as specified in Section 808-2.03(A), herein. Gate valves shall be as specified in Section 808-2.03, herein.

808-2.04(C) Electric Remote Control Valve Assembly for Drip Zones (Adding)

Remote control valve assemblies for drip zones shall consist of a ball valve (or gate valve for sizes 2" and larger), screen filter, electric control valve, inline pressure regulator, access box, and related fittings. Electric remote control valves shall be constructed of heavy duty glass-filled nylon and shall be pressure rated to 200 pounds per square inch. Valve shall be as manufactured by Rain Bird, Model PESB Series, or approved equal. Valve size shall be as noted on the project plans.

Ball valves shall be as specified in Section 808-2.03(A), herein. Gate valves shall be as specified in Section 808-2.03, herein. Screen filter shall be as specified in Section 808-2.08, herein.


Inline pressure regulator shall be constructed of durable, heat resistant plastic capable of being installed below grade. Regulator shall have a preset outlet pressure of 40 psi and have 1" FPT threaded inlet and outlet. Inline pressure regulator shall be as manufactured by Rain Bird, Model PSI-M30X-100, or approved equal.

808-2.06 Backflow Prevention Unit (Adding)

Backflow preventer shall be of the reduced pressure principle type and shall be as manufactured by Febco, Model 825-Y Series, or approved equal. Backflow preventer size shall be as noted on the drawings.

808-2.06 (A) Backflow Preventer Security Enclosure (Adding)

The backflow preventer security enclosure shall be fabricated from 1-1/2" x 3/16" steel angle and No. 9 expanded metal panels. The enclosure shall be equipped with hinges and U-bolt hasp for padlocking. The enclosure shall be as manufactured by Guardshack, Model GS2TAN, or approved equal. Color shall be “Desert Tan.”

808-2.07 Emitter Assembly (Adding)

Multi-outlet emitter assembly shall consist of a ½" PVC riser, emitter, distribution tubing, and access box as detailed on the drawings. Emitters shall be multi-outlet, pressure compensating with self-cleaning flush action. Emitter shall have six 1-GPH outlets and a ½" FPT threaded inlet. Emitter shall be as manufactured by Rain Bird, Model XBT-10-6, or approved equal.

Single-outlet emitter assembly shall consist of a ½" PVC riser, emitter, distribution tubing, and access box as detailed on the drawings. Emitters shall be single-outlet, pressure compensating with self-cleaning flush action. Emitter shall have one 1-GPH outlet and a ½" FPT threaded inlet. Emitter shall be as manufactured by Rain Bird, Model XBT-10, or approved equal. Single outlet emitters shall be used for the irrigation of individual shrubs, only.

808-2.07(A) Emitter Distribution Tubing (Adding)

Emitter distribution tubing shall be constructed of UV resistant polyvinyl materials and shall have an outside diameter of 0.22" and an inside diameter of 0.16". Tubing shall be as manufactured by Rain Bird Model DT-025, or approved equal

808-2.08 Filter (Adding)

The filter shall be of the “wye” pattern inline screen type filter with FPT threaded inlet and outlet. Filter body shall be constructed of durable non-corrosive components and shall be of the two-piece design to allow for the removal of the filter screen. Filter screen shall be 200 mesh and constructed of polyester with polypropylene frame. Size of filter shall be 1" unless otherwise noted. Screen filter shall be as manufactured by Agricultural Products, Model 4E-1. Filter shall be equipped with a stainless steel screen as manufactured by Agricultural Products, Model 4E-series or approved equal.

808-2.10 Controller (Adding)

The controller shall be as manufactured by Irritrol, Model MC Elite Series. The number of stations shall be as noted on the drawings.


The controller shall be grounded using a ground wire and three ground rods as recommended by the controller manufacturer. The size and gauge of the grounding wire and rods shall be in accordance with the controller manufacturer’s written instructions. All ground rod connections shall be made using mounting brackets and/or hardware as manufactured or approved by the controller manufacturer.

808-2.10 (A) Controller Security Cabinet (Adding)

The controller security cabinet shall be fabricated from 3/16” steel plate. The enclosure shall be equipped with ventilated doors and pry resistant lock cover. The enclosure shall be equipped with two 24 valve terminal strips and a 110 volt convenience outlet. The enclosure shall be as manufactured by Le Meur, Model LE-A-CR, or approved equal. Color shall be “Desert Tan.”

808-2.11 Flush Cap Assembly (Adding)

Flush cap assembly shall consist of a (S x MPT) Schedule 40 PVC fitting with a Schedule 40 PVC (FPT) cap. The assembly shall be fitted with a Schedule 40 PVC Ball Valve. The assembly shall be installed in a ten inch (10") diameter access box as detailed on the project plans.

808-2.12 Detectable Mainline Marking Tape (Adding)

The mainline marking tape shall be a five (5) mil thick, five-ply composition, polyethylene tape. The tape shall have a 20 gauge solid aluminum core that is fully encapsulated within the polyethylene material. The tape shall be three inches (3") wide and shall have the words “CAUTION - IRRIGATION LINE BELOW” printed at regular intervals. Tape color shall be green. The detectable marking tape shall be as manufactured by T. Christy Enterprises Inc., Model TA-DT-3"-G-I or TA-DT-3"-P-RW (reclaimed water) or approved equal.

808-2.13 Valve Access Boxes (Adding)

Valve access boxes for gate valves, ball valves, remote control valves, master valves, flow sensors, and flush caps shall be manufactured from a combination of polyolefin and fibrous inorganic components. All access boxes shall be equipped with a heavy-duty cover that is fully supported by access box. Covers shall be permanently marked with the word “IRRIGATION” and shall be capable of being bolted down for security purposes. Access boxes shall be as manufactured by NDS, or approved equals. Box sizes and types shall be as follows:

Master Valve…………………………………… Jumbo Rectangular with extensions as-needed Flow Sensor…………………………………….. Jumbo Rectangular with extensions as-needed Mainline Isolation Valves………………………. Standard Rectangular with extensions as-needed Drip Zone Remote Control Valves…………… Jumbo Rectangular with extensions as-needed Temporary Spray Zone Remote Control Valves... Standard Rectangular with extensions as-needed Emitter Line Flush Caps……………………… Ten-Inch Round 808-2.13 (A) Emitter Access Box (Adding)

The emitter access box shall be 6 inches (6") in diameter and constructed of heavy-duty, thermoplastic materials and shall be equipped with a snap-on. latching cover. The emitter access box shall be as manufactured by NDS or approved equal.


808-2.14 Flow Sensor (Adding)

The flow sensor shall be of the six-blade impeller type capable of determining flow rates between 0.5 and 30 feet per second with an accuracy of (+/-) 1%. The flow sensor shall have a heavy-duty PVC or brass body. The flow sensor shall be fully compatible with the controller and other control system components installed.

808-3 CONSTRUCTION REQUIREMENTS 808-3.01(A) System Layout (Adding)

Prior to the start of trench excavation, the Contractor shall lay out the irrigation system marking the locations of all meter(s), backflow preventers, controller(s), mainlines, isolation valves, master valves, flow sensors, remote control valves, sleeves, and related equipment. The layout shall be approved by the Engineer prior to the start of trenching and installation work. The Engineer shall have the authority to make changes to layout of the system if appropriate for field conditions.

808-3.01 (B) Blue-Staking (Adding)

The Contractor shall request that the project site be Blue-Staked prior to the start of any irrigation excavation or trenching work. Blue Staking shall be kept current during the course of the project. All utilities damaged by the Contractor shall be repaired or replaced by the Contractor, as required by the Owner or appropriate utility company, at the Contractor’s expense.

08-3.02 Trenching and Piping (Adding)

Underground piping shall be installed within trenches as detailed on the project plans. Select bedding material shall be used within three inches (3") of all pipe. Detectable marking tape shall be installed above all mainline piping as detailed on the project plans.

808-3.02(A) Pipe Sleeves (Adding)

Sleeves shall be provided in all locations where irrigation mainlines and/or laterals extend under roadways, drives, multi-use paths, sidewalks, or other paved surfaces. Sleeve sizes shall be as noted on the drawings. If sleeve size is not noted, the sleeve size shall be two standard pipe sizes larger than the pipe enclosed but in no case shall sleeve be less than two inch (2") size. The location of all sleeves under the roadway and multi-use path shall be clearly and accurately recorded on the as-built drawings. The Roadway Station where the sleeves are installed under the roadway shall be noted on the As-Built Drawings.

808-3.10 Water Meter (Adding)

The water utility serving the site may be contacted prior to the bid date for information pertaining to the Metered Water Service Application. The Contractor shall present the project plans to appropriate Water Utility personnel. Water company personnel will provide specific information pertaining to the cost of the proposed metered water service.

Following the award of contract, the Contractor shall contact the Pima County Planning and Development Services Department / Address Issuing Agency, and shall obtain an "address" for each required meter service. After the required address has been obtained, an "Application for Metered


Water Service", along with all applicable fees, may be filed with the Water Utility. The Water Utility will then schedule the installation of the required meters and services. The installation of service(s) and meter(s) will be performed by the water utility forces. All water obtained from the new irrigation water service / meter(s) and used for irrigation or other purposes during project construction and during the landscape establishment period shall be paid for by the Contractor. Upon completion of the landscape establishment period responsibility for payment of water charges will be transferred to Pima County as directed by the Engineer.

808-3.11 Backflow Preventers (Adding)

The backflow preventers shall be installed as detailed in the locations shown on the project plans. All backflow preventers shall be tested by an individual certified to perform such testing by the water utility. Certificates, signed by the tester and indicating that the devices are operating correctly, shall be filed with the Engineer and the water utility prior to the Contractor’s use of water from the new water meter.

808-3.11 (A) Backflow Preventer Security Enclosure (Adding)

A security enclosure shall be installed at each backflow preventer as detailed. The enclosure shall be positioned, relative to the backflow preventer, to allow for the opening and closing of the enclosure with out interference with the backflow preventer.

808-3.12 Valves and Sensors (Adding)

All sensors and valves (master valves, gate valves, ball valves, remote control valves, flow sensors, etc.) shall be installed in access boxes as detailed. Use teflon tape on male threads of all threaded connections. Install access boxes such that the top of the box is parallel to and flush with the surrounding grade, or as detailed. Provide gravel sumps and brick footings as detailed. In locations where more than one box is to be installed in a given location, group boxes together and keep boxes within a uniform alignment. Provide adequate clearance around enclosed valve to allow for valve operation and/or removal.

808-3.13 Control System (Adding)

The controller and all related control system components shall be installed as detailed and in accordance with the control system manufacturer’s written instructions. The work shall be under the supervision or direction of a factory authorized technician. The Contractor shall be responsible for all installation and testing work as required for the operation of the system in accordance with the manufacturer’s specifications.

808-3.13(A) Electrical Services to the Controllers (Adding)

The Contractor shall be responsible for the installation of the electrical services to the controller including the required connections at the service panel and controller. The conductors required shall be as noted on the project plans or as required by applicable code(s). All wiring shall be installed in one-inch (1") size (or larger) Schedule 40 PVC conduit. Pull boxes shall be provided and installed along the conduit path at intervals not exceeding two hundred feet (200'). All work shall be in accordance with the Pima County - City of Tucson Standard Specifications for Public Improvements, the special provisions, and applicable codes. The contractor performing the electrical work shall be licensed by the State of Arizona Registrar of Contractors and shall hold a license appropriate for the work to be performed.


808-3.14 Flush Cap Assembly (Adding)

Flush cap assembly shall be installed at the end of lateral lines as shown on the plans. Assembly shall be installed in a ten inch (10") diameter access box as detailed.

808-3.16 Irrigation System Guarantee (Adding)

The Contractor shall guarantee the irrigation system installed to be free from defects in materials and worksmanship for a period of two-years starting on the date of Final Acceptance of the Work. All materials and equipment that are found to be defective during the guarantee period, for reasons other than vandalism, neglect, or improper operation by others, shall be repaired or replaced by the Contractor at no cost to Pima County. Repair or replacement work shall be completed within 10 calendar days of receipt of written notice. If work is not completed within this time period, Pima County may perform the work, or have others perform the work, and bill the Contractor for all direct expenses associated with the remedial work.

808-4 TESTING 808-4.01 Operational Testing (Adding)

Upon completion of the irrigation system installation, the Contractor shall perform an operational test of the irrigation system. The operational test shall be performed with the Engineer present. The test shall demonstrate that the controller, control valves, and all system applicators are operating correctly and providing adequate water to the landscape plantings. Irrigation system components found to be operating incorrectly shall be repaired or replaced prior to start of the Landscaping Establishment Period and at no cost to the Owner.

808-5 RECORD AND AS-BUILT DRAWINGS 808-5.01 As-Built Drawings (Adding)

The Contractor shall submit to the Owner’s Representative, prior to Substantial Completion of the Work, as-built record drawings for the irrigation system installed. The drawings shall indicate the location of all; meters, backflow preventers, mainlines, master valves, isolation valves, and sleeves / pipelines under paved surfaces. Sleeves under the roadway shall be identified by roadway station number. The location of valves and other system appurtenances shall be identified by two or more dimensions from fixed objects such as curbs, or utility structures. As-built drawings shall be prepared with ink on-mylar. The preparation of the mylar drawings shall be the Contractor’s responsibility and shall be at the Contractor’s expense.

A set of as-built drawings shall be maintained on the project site at all times. The as-built drawings shall be updated daily, as the work is performed. If the as-built drawings are not updated in an accurate or timely manner, The Engineer shall have the authority to order a stop to the irrigation installation work. The stop shall remain in effect until such time as the as-built irrigation drawings are updated and/or corrected as specified.



The completed landscape irrigation system will be measured based on the units of work listed in the Bidding Schedule, complete-in-place. System components not specifically listed in the Bidding Schedule are considered incidental to the irrigation system work.


Accepted quantities for the various irrigation system components listed in the Bidding Schedule will be paid for at the contract unit prices for the system components listed in the Bidding Schedule. No separate payment will be made for incidental irrigation system components not listed in the Bidding Schedule.


SECTION 809 NATIVE PLANT SALVAGE WORK


The following section of the Special Provisions, Section 809 (NATIVE PLANT SALVAGE WORK) is added in its entirety to the Pima County - City of Tucson Standard Specifications for Public Improvements. 809-1 DESCRIPTION

The work under this section shall consist of the salvage of native trees and shrubs using side-boxing techniques, the salvage of cacti using bare-root transplanting techniques, the delivery of salvaged plants to the on-site holding nursery, the maintenance of the salvaged plants in the on-site holding nursery during project construction, and the replanting of the salvaged plants on the project.

809-2 MATERIALS 809-2.01 Plants to be salvaged

The native plants to be salvaged shall be as noted on the project plans. After staking the limits of grading and prior to the start of native plant salvage activities, the Contractor shall schedule an inspection of the project site with the Engineer. During this inspection, the plants to be salvaged will be confirmed.

809-2.02 Materials for Boxing and Banding

All materials used for the boxing and banding of the salvaged plant material shall be new, shall be normal for the native plant salvage industry, and shall be suitable for the work to be performed.

809-3 CONSTRUCTION DETAILS 809-3.01 Vehicular Access to the Site

Vehicular access to the plants to be salvaged shall be from within the approved limits of grading. Vehicular access to plants from areas outside the approved limits of grading is prohibited.

809-3.02 Protection of Existing Plants and Natural Areas to be Preserved-in-Place

All plants and natural areas outside the limits of grading, or designated as to be preserved-in-place, shall be protected during the implementation of the native plant salvage work.

809-3.03 Boxing of Trees and Shrubs

All trees and shrubs shall be salvaged using side-boxing techniques. Except as may be approved by the Engineer, the boxing work shall be implemented as follows. The plant shall be pruned to facilitate salvage work. Pruning work shall be implemented in accordance with technical bulletin ANSI-A-300-1995.


1. The sides of the rootball shall be excavated in a manner that maintains an intact root ball and soil mass.

2. The side panels of the box shall be installed and secured.

3. The plant shall be watered daily, or at other interval approved by the Engineer, for a period of not

less than 28 days. The volume of water applied shall be sufficient to keep all soil within the box continuously wet.

4. Upon completion of the in-field holding and irrigation period, the roots extending below the bottom

of the box shall be cut and the bottom box panel shall be installed and secured.

5. The boxed plant shall then be transported to the temporary on-site holding nursery where it can be irrigated daily. Lifting and transporting equipment shall be of the size, type, and capacity that will prevent damage to the plant and/or root ball box. The equipment used shall be as approved by the Engineer.

6. Excavations resulting from the removal of plants shall be backfilled. The backfilling of excavations

shall be completed on the same day as the plant is removed. Backfilling operations in areas to be paved shall be performed in accordance with the Standard Specifications for trench / excavation backfill work.

809-3.04 Box Sizes

Except as approved by the Engineer, minimum box sizes for trees shall be as listed below. Larger box sizes may be utilized if deemed necessary or appropriate by the Contractor. The minimum box sizes are based on caliper of the tree trunk (for single trunk trees) or the combined caliper of the two largest trunks (for multi-trunk trees) as follows:

Tree Caliper Minimum Box Size

1.0" - 2.5" 24" Box 2.0" - 4.0" 30" Box 3.5" - 5.5" 36" Box 5.0" - 7.5" 42" Box 7.0" - 9.5" 48" Box 9.0" - 11.5" 54" Box 11.0" - 13.5" 60" Box 13.0" - 15.5" 66" Box 15.0" - 17.5" 72" Box

809-3.05 Access to Individual Plants

If necessary, plants not scheduled for salvage may be trimmed or, if within the limits of grading, removed as needed to obtain access and safe working conditions around individual plants to be salvaged. Removal and trimming work shall be as approved by the Engineer.


809-3.06 Plant Identification Numbers

Immediately following the installation of box side panels, the identification number for each salvaged (boxed) plant shall be clearly and conspicuously painted on two sides of the box. Plant identification numbers painted on the box shall correspond to the plant identification numbers shown on the project plans.

809-3.07 Salvaging of Cacti, Ocotillo, and Stem Succulents

All cacti, ocotillo, and stem succulents shall be salvaged using bare-root transplanting techniques. The extent of the root system retained with the plant shall be normal for the industry and shall be as required for successful bare root transplanting.

All salvaged cacti, ocotillo, and stem succulents shall be transported to the temporary on-site holding nursery and healed-in.

809-3.08 Temporary Plant Holding Nursery

The Contractor shall establish and maintain a temporary holding nursery / area for plants salvaged from the site. The Contractor shall be responsible for all labor, materials, equipment, tools, and other resources necessary for the establishment and operation of the nursery. The nursery location shall be approved by the Engineer.

The on-site holding nursery shall be developed with an automatic drip irrigation system for all boxed trees and shrubs. The Contractor shall be responsible for the design, installation, operation, and subsequent removal of the irrigation system. The drip irrigation system shall be as approved by the Engineer.

Temporary fences to control access to the holding nursery, if deemed necessary by the Contractor, shall be furnished, installed, maintained, and subsequently removed by the Contractor.

809-3.09 Temporary Water Source and Irrigation System

The Contractor shall provide a temporary water source for the holding nursery / area and shall pay all fees for temporary connections, meters, and water used.

809-3.10 Standards for Maintenance of Plants in the On-Site Holding Nursery

All trees and shrubs shall be irrigated daily or at other interval approved by the Engineer. The daily application of water shall be sufficient to keep the entire soil volume within the root ball continuously moist. Irrigation applications shall be adjusted based on changes in weather conditions.

809-3.11 Plant Guarantee

The Contractor shall guarantee the survival and health of all plants salvaged and replanted as part of this contract. The salvaged native plant guarantee period shall extend through the end of the Landscaping Establishment Period. All plants which die during the guarantee period, for reasons other than acts-of-God and/or causes deliberate shall be replaced by the Contractor with plants of the same size and species. Replacements shall be provided at the Contractor’s expense.


To satisfy the plant guarantee requirements, the plant shall:

1. Exhibit healthy growth throughout the plant structure. 2. Be free from significant die back within branches or portions of the plant. 3. Be reasonably free from insects or other infestations that would reduce the plant’s long-term

potential for survival. 4. Be reasonably free from physical damage to the trunk, branches, or foliage that would reduce the

plant’s long term potential for survival. 809-4 METHOD OF MEASUREMENT

The native plant salvage work will be measured on a per each basis for the plant types and sizes listed in the Bidding Schedule. They will be measured when they are delivered to the on-site holding nursery as healthy plants.

The establishment and removal of the on-site holding nursery will be measured on a lump sum basis as listed in the Bidding Schedule.

The operation of the on-site holding nursery will be measured on a per month basis as listed in the Bidding Schedule.

The replanting of salvaged plants will be paid for on a per each basis for the plant types and sized listed in the Bidding Schedule. They will be measured when they are installed in the final planting locations and connected to the project irrigation system.

809-5 BASIS OF PAYMENT

The accepted quantities of salvaged plants will be paid for at the contract unit prices (for plants of various types and sizes) listed in the Bidding Schedule. No payment will be made for plants that are delivered to the on-site holding nursery in a dead, damaged, or unhealthy condition.

Payment for the establishment / removal of the on-site holding nursery will be paid for as follows:

A. 50% of the lump sum amount at the time the nursery is set-up and made fully operational with an automatic irrigation system.

B. 50% of the lump sum amount when the nursery is removed from the site and the area cleaned-up and

seeded.

Payment for the operation of the on-site holding nursery will be paid for at the contract unit price per month listed in the Bidding Schedule.

Payment for the replanting of the salvaged plants will be paid for at the contract unit prices (for plants of various types and sizes) listed in the Bidding Schedule.


SECTION 932 PAVERS


The following portions of Section 932 (PAVERS) of the Pima County - City of Tucson Standard Specifications for Public Improvements (most recent edition) are modified as follows: 932-2 MATERIALS 932-2.02 Pre-Cast Colored Concrete Paving Units (Adding)

The pre-cast colored concrete paving units shall be manufactured with Type II, low alkali, sulfate resistant, portland cement conforming to ASTM C-150. Aggregates shall be clean and shall conform to ASTM C-33. Aggregate size shall not exceed 3/8 inch. Aggregates shall have less than 2% passing the #200 screen. Coloring agents and pigments shall conform to ASTM C-979.

Paver size shall be 4" x 8" (nominal) by 2-1/4" thick. The pavers shall be rectangular in shape and shall have beveled edges on all top (exposed) corners. Color A shall be “Dark Brown”and color B shall be “Buff.”

Paving units shall be as manufactured by Superlite Block, or approved equal. The Contractor shall submit samples of the colors proposed for use on the project. Pavers shall not be delivered to the site until the colors (and other paver features) have been approved by the Engineer.

932-3 CONSTRUCTION DETAILS 932-3.01 Subgrade Preparation (Adding)

The subgrade shall be prepared and compacted in accordance with the requirements of Section 908, Concrete Curbs, Gutters, Sidewalks and Driveways of the Standard Specifications. The subgrade shall be approved by the Engineer prior to the placement of sand bedding material.

The prepared subgrade shall be treated with a pre-emergent herbicide. The herbicide shall be "Surflan", or approved equal. The pre-emergent shall be applied in strict accordance with applicable governmental regulations. The application shall be made by an Applicator licensed by the State of Arizona.

932-3.02 Bedding Material for Pre-cast Colored Concrete Paving Units (Adding)

The bedding material shall be a mixture of sand and portland cement made up of one (1) part portland cement to fifteen (15) parts clean mortar sand. The bedding material shall be tamped and compacted after placement to minimize settlement of the paving units. Tamping procedures shall be as approved by the Engineer. The depth of the bedding material, after tamping and leveling, shall be two inches (2"), minimum. The sand-portland cement bedding shall not be mixed more than two (2) hours prior to placement.


932-3.03 Layout of Work (Adding)

The paving work shall be laid out in a manner that minimizes the required number of saw-cut paving units. The pattern used shall be as illustrated and /or noted on the drawings. Half-size or end units shall be utilized wherever feasible. Half-size or end units shall be used in all instances where pavers are installed adjacent to the roadway curb. Where it is necessary to install partial units adjacent to headers or utility access boxes, the paving units shall be saw-cut. The elevation of the top of the utility access box or other improvements installed at grade shall be adjusted as required to meet the surface tolerances specified herein. The layout of the work and pattern of the pavement shall be subject to the Engineer's approval.

932-3.04 Surface Tolerances for Pre-cast Colored Concrete Paving Units (Adding)

The surface of the pre-cast colored concrete paving units shall not vary more than one-eighth inch (1/8") from the lower edge of a ten-foot (10') straightedge when the straightedge is placed parallel to or perpendicular to the centerline of the roadway. The one-eighth inch (1/8") variation shall be exclusive of the beveled edges and grooves associated with the individual paving units.


Pre-cast colored concrete paving units will be measured by the square foot of paving placed as shown on the plans or as directed by the Engineer.


The accepted quantities of pre-cast colored concrete unit paving, measured as provided for above, will be paid for at the contract unit price per square foot identified in the Bidding Schedule.

Appendix E: Standard Bid Item List

Item Description Unit

8010001 Landscape Excavation SY

8020001 Landscape Grading SY8020011 Landscape Grading LS

8030001 Landscape Borrow CY8030002 Landscape Borrow SY8030003 Landscape Borrow TON8030020 Decomposed Granite SY8030022 Decomposed Granite CY8030023 Decomposed Granite TON8030024 Decomposed Granite (Stabilized) SY8030030 Rock Mulch (Type 1) CY8030032 Rock Mulch (Type 2) CY8030034 Rock Mulch (Type 3) CY8030050 Plating Material SY8030051 Plating Material CY8030052 Plating Material TON8030070 Decorative Boulders CY8030071 Decorative Boulders TON8030072 Decorative Boulders EACH

8040001 Topsoil CY

8050001 Seeding (Class I) SY8050002 Seeding (Class I) ACRE8050003 Seeding (Class II) SY8050004 Seeding (Class II) ACRE8050005 Seeding (Class II) (Type A) SY8050006 Seeding (Class II) (Type B) SY8050007 Seeding (Class II) (Type C) SY8050011 Seeding (Class III) SY8050012 Seeding (Class III) ACRE

8060001 Planting Trees, Shrubs, & Plants LS8060002 Planting Trees LS8060006 Planting Shrubs LS8060010 Planting Plants LS8060012 Miscellaneous Planting LS8060020 Orange Protectuve Fencing 42" high LF

Master Schedule - Landscape and Irrigation Bid Items

Section 802 - Landscape Grading

Section 803 - Landscape Borrow and Plating Materials

Section 805 - Seeding

Section 802 - Landscape Excavation

Section 804 - Soil

Section 806 - Trees, Shrubs, and Plants



8060022 Salvage Tree (Side Box 24") EA8060024 Salvage Tree (Side Box 30") EA8060026 Salvage Tree (Side Box 36") EA8060028 Salvage Tree (Side Box 42") EA8060030 Salvage Tree (Side Box 48") EA8060032 Salvage Tree (Side Box 54") EA8060034 Salvage Tree (Side Box 60") EA8060036 Salvage Tree (Side Box 66") EA8060038 Salvage Tree (Side Box 72") EA8060040 Salvage Tree (Side Box 78") EA8060040 Transplant Trees EA8060041 Transplant Trees LS8060046 Transplant Cactus EA8060047 Transplant Saguaros LF8060048 Transplant Yucca EA8060049 Transplant Ocotillo EA8060050 Transport Box Tree (24"-48") MI8060052 Transport Box Tree (54"-60") MI8060054 Transport Box Tree (66"-78") MI8060070 Plant Salvaged Tree (24"-36") EA8060072 Plant Salvaged Tree (42"-48") EA8060074 Plant Salvaged Tree (54"-66") EA8060076 Plant Salvaged Tree (72"-78") EA8060080 Spade Small Tree (48" & umder) EA8060082 Spade LargeTree (over 48") EA8060084 Transport Small Spaded Tree MI8060086 Transport Large Spaded Tree MI8061001 Tree (One Gallon) EA8061002 Tree - Nursery Stock - 5 Gallon Size EA8061003 Tree - (5 Gallon Agency Provided) EA8061004 Tree (15 Gallon) EA8061005 Tree (15 Gallon Agency Provided) EA8061007 Tree (20" Box) EA8061009 Tree (24" Box) EA8061010 Tree (24" Box Agency Provided) EA8061011 Tree (30" Box) EA8061012 Tree (30" Box Agency Provided) EA8061013 Tree (36" Box) EA8061014 Tree (36" Box Agency Provided) EA8061015 Tree (42" Box) EA8061016 Tree (42" Box Agency Provided) EA



8061017 Tree (48" Box) EA8061018 Tree (48" Box Agency Provided) EA8061019 Tree (54" Box) EA8061020 Tree (54" Box Agency Provided) EA8061021 Tree (60" Box) EA8061022 Tree (60" Box Agency Provided) EA8061023 Tree (66" Box) EA8061024 Tree (66" Box Agency Provided) EA8061025 Tree (72" Box) EA8061026 Tree (72" Box Agency Provided) EA8061027 Tree (78" Box) EA8061028 Tree (78" Box Agency Provided) EA8061040 Tree (Palm) EA8061090 Tree Staking EA8061101 Ground Cover (Flats) EA8061102 Rodent Protection Cage at Tree EA8061111 Ground Cover (One Gallon) EA8061200 Yucca (Specimen) (15 Gallon) EA8061295 Shrub (One Gallon Agency Provided) EA8061296 Shrub (One Gallon) EA8061297 Shrub (Five Gallon Agency Provided) EA8061298 Shrub (Five) EA8061299 Shrub (15 Gallon) EA8061300 Shrub (15 Gallon Agency Provided) EA8061429 Yucca (3'-5') EA8061501 Vine (One Gallon) EA8061505 Vine (Five Gallon) EA8061602 Saguaro Cactus (1'-3') EA8061603 Saguaro Cactus (4'-7') EA8061604 Saguaro Cactus (8'-12') EA8061605 Saguaro Cactus (13'-15')) EA8061606 Saguaro Cactus (>15') EA8061607 Saguaro Cactus (<14') (Agency Provided) EA8061609 Cactus LF8061610 Cactus (Agency Provided) EA8061612 Barrel Cactus EA8061654 Ocotillo (Agency Provided) EA8061655 Ocotillo (4'-6') EA8061656 Ocotillo (6'-8')) EA8061700 Landscape Pruning HOUR8061701 Browser Cages EA



8061800 Landscaping Salvaged Maintenance LS8061802 Salvage Maintenance (Tree per month) EA8061804 Salvage Maintenance (Cacti per month) EA8061806 Salvage Maintenance (Saguaro over 5' per month) EA8061820 Salvage Holding Yard Set-up LS

8070001 Landscaping Establishment LS

8080001 Landscape Iririgation System LS8080002 Provide Water Service (New 1-1/2" Meter) EA8080003 Provide Water Service (New 2" Meter) EA8080011 Backflow Preventer w/ Security Encl. (1") EA8080012 Backflow Preventer w/ Security Encl. (1-1/2") EA8080013 Backflow Preventer w/ Security Encl. (2") EA8080121 Master Valve Assembly - 1" Size EA8080122 Master Valve Assembly - 1-1/2" Size EA8080123 Master Valve Assembly - 2" Size EA8080131 Flow Sensor / Meter - 1" Size EA8080132 Flow Sensor / Meter - 1-1/2" Size EA8080133 Flow Sensor / Meter - 2" Size EA8080141 Controller in Security Cabinet - 8 Station EA8080142 Controller in Security Cabinet - 12 Station EA8080143 Controller in Security Cabinet - 18 Station EA8080144 Controller in Security Cabinet - 24 Station EA8080145 Controller in Security Cabinet - 36 Station EA8080151 Cluster Control Unit - 6 Device Unit EA8080152 Cluster Control Unit - 28 Device Unit EA8080163 Electrical Service to Controller LS8080164 Telephone Service to Controller / CCU LS8080101 Pressure Reg. Valve Assembly - Brass - 1" EA8080102 Pressure Reg. Valve Assembly - Brass - 1-1/2" EA8080103 Pressure Reg. Valve Assembly - Brass - 2" EA8080201 Gate / Isolation Valve Assembly - 2" EA8080202 Gate / Isolation Valve Assembly - 2-1/2" EA8080203 Gate / Isolation Valve Assembly - 3" EA8080204 Gate / Isolation Valve Assembly - 4" EA8080211 Ball / Isolation Valve Assembly - 3/4" EA8080212 Ball / Isolation Valve Assembly - 1" EA8080213 Ball / Isolation Valve Assembly - 1-1/4" EA8080214 Ball / Isolation Valve Assembly - 1-1/2" EA8080221 Drip Zone Rem. Cont. Valve Assembly- 1" EA

Section 808 - Landscape Irrigation System

Section 807 - Landscaping Establishment



8080222 Drip Zone Rem. Cont. Valve Assembly - 1-1/2" EA8080223 Drip Zone Rem. Cont. Valve Assembly - 2" EA8080231 Spray Zone Rem. Cont. Valve Assembly - 1" EA8080232 Spray Zone Rem. Cont. Valve Assembly - 1-1/2" EA8080234 Spray Zone Rem. Cont. Valve Assembly - 2" EA8080241 Quick-Coupling Valve Assembly - 3/4" Size EA8080242 Quick-Coupling Valve Assembly - 1" Size EA8080301 Mainline Pipe - Sch. 40 PVC - 1" Size LF8080302 Mainline Pipe - Sch. 40 PVC - 1-1/4" Size LF8080302 Mainline Pipe - Sch. 40 PVC - 1-1/2" Size LF8080303 Mainline Pipe - Sch. 40 PVC - 2" Size LF8080311 Lateral Line Pipe - Sch. 40 PVC - 1/2" Size LF8080312 Lateral Line Pipe - Sch. 40 PVC - 3/4" Size LF8080313 Lateral Line Pipe - Sch. 40 PVC - 1" Size LF8080314 Lateral Line Pipe - Sch. 40 PVC - 1-1/4" Size LF8080315 Lateral Line Pipe - Sch. 40 PVC - 1-1/2" Size LF8080316 Lateral Line Pipe - Sch. 40 PVC - 2" Size LF8080321 Pipe Sleeve - Schedule 40 PVC - 2" Size LF8080322 Pipe Sleeve - Schedule 40 PVC - 4" Size LF8080333 Pipe Sleeve - Schedule 40 PVC - 6" Size LF8080401 Multi-Outlet Drip Emitter Assembly EA8080402 Single-Outlet Drip Emitter Assembly EA8080403 Flush Cap Assembly EA8080501 Temporary Spray Head Assembly EA

9320050 Precast Concrete Unit Pavers SFSection 932 Brick / Precast Concrete Unit Paving