Special_Provisions_-_Schedule_1.pdf

1. SSP 20201 Bioretention Soil Mix (BSM)

Description: The BSM shall be a mixture of 60% Fine Aggregate (Sand), 20% Loamy Sand and 20% Compost conforming to the following requirements.

Materials: This item covers BSM material testing, producing and construction requirements.

1) FINE AGGREGATE (SAND) – 60% of BSM

a. Fine Aggregate shall be washed and free of wood, waste or any other foreign material.

b. Fine Aggregate shall be analyzed using AASHTO T-11/T-27 and meet the following gradations requirements:

ISPWC – Section 801.2.2 Filter Sand

SIEVE SIZE PERCENT PASSING

3/8 inch 100

No. 4 95-100

No. 8 Report Only

No. 16 45-80

No. 30 Report Only

No. 50 10-30

No. 100 2-10

No. 200 0-4

c. Fine Aggregate Sand shall be analyzed to meet the following requirements:

Test Method SPECIFICATIONS

Soluble salt < 3.0 dS/m

Boron < 0.8 ppm

SAR < 2.0

2) LOAMY SAND – 20% of BSM

a. Loamy sand shall be free of weeds, roots, stems, seeds, heavy metals and all other foreign material.

Ada County Highway District | Standard Special Provisions

b. Loamy Sand shall be classified using ASTM D-422 and meet the following requirements:

COMPONENT PERCENT IN SAMPLE

Sand 70-90

Silt 0-30

Clay 10-20

c. Loamy Sand shall be analyzed and meet the following requirements:

TEST METHOD SPECIFICATIONS

Phosphorus – Olsen P <60 mg/kg

Comprehensive Soil Analysis including: TEC, pH, soluble salt, major and minor nutrients, half saturation, SAR, & percent organic matter

Typical Range

3) COMPOST – 20% of BSM

a. The Compost shall be a mature, well decomposed, weed free, herbicide free, pesticide free, and absent of garbage. Organic matter source shall be derived from waste (feedstock) including yard debris, wood waste, or crop by-products.

This product shall not include straight manure or bio-solids. Any manufactured materials (plastic, concrete, ceramics, or metal) shall be less than 1.0% by dry weight of the product.

b. Compost shall be analyzed and meet the following requirements:

TEST METHOD SPECIFICATIONS

Sieve Analysis – AASHTO T-11/T27 ½” Screen – 100% passing

No. 200 Screen – 0-20% passing

Percent Moisture 35%-50%

Organic Matter – ASTM F-1647 or

TMECC 05.07A

35%-65% pH – TMECC 4.11 6-8

Carbon: Nitrogen Ratio 15:1 – 35:1**

Soluble Salt < 6 dS/m

Maturity – TMECC 05.05A or Solvita >80% >5%

Pathogens:

Fecal Coliform – TMECC 07.01AB

Salmonella – TMECC 07.02A

<1000 MPN/g

<3 MPN/4g

**Failing test results may require an action plan be submitted to ACHD detailing by what means the C:N ratio will be adjusted to specification during placement.

4) BSM MIXTURE

a. BSM Mixture shall be analyzed and meet the following requirements:

TEST METHOD SPECIFICATIONS

Organic Matter – ASTM F-1647 or

TMECC 05.07A

2%-13% pH – TMECC 4.11 6-8

Cation Exchange Capacity (CEC) –

ASTM D-7503

≥5 meq/100g

Constant Head Permeability – ASTM D-2434

> 5 inches/hour

b. A description of the equipment and methods used to completely mix the three components of the BSM and the delivery to the project site.

c. Tests should be conducted no more than 120 days prior to the delivery date of the BSM to the project site. Batch-specific test results and certification will be required for projects installing more than 100 cubic yards of BSM.

d. The Contractor shall submit the following for approval:

i. All required test data for each individual component and on the BSM mixture.

ii. A one gallon sample of the BSM mixture shall be submitted to ACHD for review within 10 business days of the contract date.

iii. ACHD may request additional samples of any individual component and/or the BSM mixture to be submitted.

Workmanship:

1) After excavation to subgrade, the BSM shall be placed over the surface of the specified area to the limits as shown on the plans.

a. Erosion and sediment control practices during construction should be employed to protect the long-term functionality of the bio-retention. The following practices shall be followed for this reason.

i. Provide erosion control in the contributing drainage areas to the facility and stabilize upslope areas.

ii. Facilities should not be used as sediment control facilities, unless installation of all bio-retention related materials are withheld towards the end of construction, allowing the temporary use of the location as a sediment control facility, and appropriate excavation of sediment is provided prior to installation of bio-retention materials.

b. Do not excavate, place soils, or amend soils during wet or saturated conditions.

c. Operate equipment adjacent to the facility. Equipment operation within the facility should be avoided to prevent soil compaction. If machinery must operate in the facility, use lightweight, low ground contact pressure equipment.

d. If constructing an infiltrating facility, the subgrade should be ripped or scarified to a minimum depth of 9 inches to promote greater infiltration.

i. The BSM should be mixed prior to being delivered to the site.

ii. Place soil in 6 to 12 inch lifts with machinery adjacent to the facility (to ensure equipment is not driven across soil). If working within the facility, to avoid over-compacting, place first lifts at far end from entrance and place backwards towards entrance.

iii. Allow BSM lifts to settle naturally, lightly water to provide settlement and natural compaction between lifts. After lightly watering, allow soil to dry between lifts. Soil cannot be worked when saturated, so this method should be used with caution to ensure dry conditions. After all lifts are placed, wait two days to check for settlement, and add additional media as needed. No mechanical compaction is allowed.

iv. The long-term hydraulic conductivity rate should not be less than 5 inches per hour when tested with a double ring infiltrometer (in accordance with ASTM D-3385, Standard Test Method for Infiltration Rate of Soils in Field Using Double Ring Infiltrometer), a single ring infiltrometer, a Modified Philip-Dunne Infiltrometer, or other approved methods.

v. Vehicular traffic and construction equipment shall not drive on, move onto, or disturb the BSM once placed and water compacted.

vi. Rake bio-retention soil as needed to level out. Verify BSM elevations before applying mulch or installing plants.

Measurement and Payment:

Payment shall be on a cubic yard quantity basis. No final measurement will be made.

SSP 20201 Bioretention Soil Mix (BSM)….…………..………….…………………………..Per Cubic Yard

2. SP 29097 Landscape Boulders

Description:

i. This item consists of furnishing all labor, equipment and material necessary to load, haul and install small 30” to 36” diameter boulders at the locations detailed in the plans and per the detail sheets.

Materials:

24” to 36” diameter boulders to be provided by Contractor shall be local sandstone. All rock shall be non-decomposing sandstone.

Worksmanship:

Boulders shall be placed per plans and detail as well as a natural aesthetic appearance.

Measurement and Payment:

Prices include loading, hauling and installing of Small Boulders 30” to 36”. If required and not listed in the Bid Schedule, other required work and materials necessary for a complete installation are to be considered incidental to the following bid item:

Small Boulders 30” TO 36”: by the cubic yard

SP 29097 Landscape Boulders………………………………………………………….Per Cubic Yard

3. SP 20204 A&B, SP 29098 Planting Shrubs/Trees/Ground Cover

Description: This item shall include all costs associated with providing and planting trees, shrubs, and ground cover.

Materials: Provide plants that meet the applicable requirements of the American Standard for Nursery Stock. Ensure plants are true to type and name in accordance with Standardized Plant Names prepared by the American Joint Committee on Horticultural Nomenclature. Provide plants that are sound, healthy, vigorous, well branched, and densely foliated when leaves are present, and without disease or insects including adult eggs, pupae, or larvae. Provide plants without disfiguring limbs, knots, limb scars, sun scald, abrasions of the bark, wind or freezing damage, or other disfigurements. Do not cut back plants from larger sizes to meet specified sizes. The Engineer will reject plants with the presence of noxious weeds in the containers or at the source.

Provide nursery grown plants unless collected plants are specified. Grow or condition plants to an environment similar to the project site including elevation, site and soil conditions, and climate.

The term “nursery grown” consists of natural seedling trees and shrubs, provided such trees and shrubs have been growing continuously in one nursery for the minimum periods of time specified in table below.

Plant Age

Plant Material Time in Nursery

Trees 2 growing seasons

Shrubs, Evergreens 2 growing seasons

Shrubs, Deciduous 1 growing season

Wetland Plants 2 growing seasons

Provide trees with straight trunks, well branched with symmetrical tops and no unhealed scars more than ¾ in diameter.

Provide well established containerized plants with a root system sufficiently developed to retain its shape and hold together when removed from the container. The Engineer may reject plants that are pot bound, or have kinked, circling, or bent roots.

Provide plants in pots or containers of a size shown on the plans.

Deciduous plants may be supplied bareroot (B.R.) unless specified otherwise.

Provide B.R. plants that are one size group larger than the sizes specified before pruning and are packed in moisture retaining material.

Provide broadleaf evergreen plants and conifers Balled and Burlapped (B&B) or in suitable containers.

Pack B&B plants, except seedlings, with a firm ball of earth surrounded with burlap firmly held in place by a cord or wire wrapping. Provide B&B plants with firm, natural earth balls of standard size in accordance with the American Standard for Nursery Stock and the root collar located within the top two inches of the soil ball. Handle B&B plants by the earth ball only and protect against drying and freezing.

The Engineer will reject broken or loose balls or plants without an adequate root system.

Pack and ship the plants in accordance with the American Standard for Nursery Stock.

File required state and federal inspection certificates for plant shipments with the Engineer.

Do not substitute plant materials unless previously authorized and approved by the Engineer.

Label plants according to size and scientific plant name with durable and legible tags. Deliver plants with labels securely attached to plants, bundles, and containers of plant materials. Provide actual certificate of inspection, or a copy, for injurious insects, plant diseases, and other plant pests for each shipment or delivery of plant materials. Indicate the name, address and the source of the stock on the certificate.

Leave the labels on at least one plant of a group of the same species and on each plant for individual planting during and after planting operations within the same area.

Workmanship: Ensure adequate and proper care of plant material. Adequate and proper care includes keeping plant materials in a healthy, growing condition by appropriate handling, storing, watering, cultivating, pruning and spraying.

Unless otherwise approved by the Engineer, perform planting operations between May 15 and September 15, and take advantage of favorable planting conditions. Plant bare root plants before the leaves open or new needles have started forming.

Grade and/or level both the irrigated and sodded area(s) to be planted before staking or marking planting locations. Disk natural or unmaintained area(s) or leave in a roughened condition before staking planting locations. Mark out and stake tree locations and the general layouts of planting areas for shrubs, vines, and ground cover. Do not begin planting until the area(s), tree locations and general layouts of the planting site(s) are approved by the Engineer.

Cultivate planting areas for shrubs and vines to at least 4 inches deep. Remove and dispose of weeds and other vegetative growth, large clods, rocks, and other debris encountered in the cultivating work.

When excavating holes for planting, keep topsoil separate from subsoil and make loose and friable.

Remove and dispose of soils containing a pH greater than 8, a pH less than 4, gravel, stones, or other detrimental material encountered during excavation. A soil auger may be used if approved by the Engineer. Sufficiently roughen glazed surfaces inside planting holes before backfilling.

Remove plants from plastic, metal, or biodegradable containers before planting.

Take care to prevent disturbance of the root systems or earth. For bare-root plants, spread out their roots in a natural position, without bunching, kinking or circling.

Mulch planted areas immediately after planting work in each area is complete and the ground is smooth and clean. Place mulch 3 to 4 inches thick using wood chips or small bark. Cover the entire area of shrub and vine root systems as well as around trees as shown on the plans.

Remove mulch from plants, structures, roadway areas and grassed areas not to be covered.

Thoroughly water trees, shrubs, vines and ground cover during and immediately after planting. Repeat watering as often as necessary during the established period until the work is accepted by the Engineer.

Exercise care to prevent puddled soil conditions and avoid compaction around the plants after watering.

Prune trees and shrubs when planting and remove broken or damaged twigs, branches, or roots in a manner that retains or encourages plants natural growth characteristics. Paint cut surfaces with a diameter of 1 inch or greater immediately with approved tree wound dressing.

Ensure the establishment of plantings by watering, cultivating, replacing plants or mulch, and other work necessary to maintain the plants in a healthy condition, throughout the plant establishment period.

If herbicides are used to control weeds, replace and maintain plants and lawn damaged by its use at no additional cost to ACHD.

At completion of the original planting, the Engineer will perform an inspection with the Contractor of plant material to note and correct discrepancies. The Contractor shall remove and replace dead plants at no additional cost. Plants that do not show expected growth, but retain green leaves, stems, or buds and the Engineer will inspect again during the plant establishment period.

After the original planting the Engineer will periodically inspect the condition of plants and planting areas. The Engineer will notify the Contractor of apparent defects, faults and conditions, and dead plants discovered by the inspection. All replacement plants shall be of the same species and quality as the plants they replace. Plants may vary in size reflecting one season of growth should the Contractor elect to hold plant material under nursery conditions for an additional year to serve as replacement plants. Correct apparent defects, faults and conditions, and remove, dispose and replace dead plants within 10 days after notification or as directed by the Engineer.

If immediate replacement of dead or rejected plants is impossible due to seasonal conditions or the lack of specified plants, place a marker at the spot of replacement and replace plants next planting season.

ACHD will require a plant establishment period of six months for replacement plants. Ensure the establishment of the new plantings as specified.

If infestation by insects or disease occurs, treat plants using effective remedial measures that are good horticultural practices and in accordance with best management practices.

ACHD will make progress payments for plants at 80 percent of the contract unit price at the completion of the original planting. ACHD will pay the remaining 20 percent at the completion of the plant establishment period when defective plants have been replaced.

Measurement and Payment:

Payment for these items will be made under the following:

SP 29098 Planting Trees (Seedlings or Container) ................................................Per Each

SSP 20204 Planting Shrubs (Bare-root or Container)..............................................Per Each

SSP 20206 Planting Ground Cover...........................................................................Per Each

4. SSP 20219 Watering

Description: The work under this section shall consist of furnishing all water required for establishing vegetation within the project limits, during the establishment period. This work shall include securing and transporting water to the project site. All costs, and all labor, equipment, and materials required to secure, transport, and furnish water to the project limits, shall be considered as included in the work.

The Contractor shall be responsible for maintaining the desired level of moisture necessary to maintain vigorous and healthy growth.

Materials: Water used for the irrigation of revegetated areas shall be free of pollutants that will have a detrimental effect on the plants.

Workmanship: Revegetated areas shall require irrigation coverage of 100%. The Contractor shall water the planted areas as necessary, using a suitable fine spray which shall not disturb the vegetation and which will not cause any erosion.

The Contractor shall ensure that the planted area receives the minimum amount of water per the table below. The total monthly amount from the table shall be equally dispersed per week of the entire month and shall be applied uniformly over the whole area.

Inches/month May June July August Sept

Long season range grasses

2.48 4.20 4.96 3.10 0.90

Measurement and Payment: Payment for these items will be made under the following:

SSP-20219 Watering....................................................................…………………….........Per Lump Sum

5. SP 25002 Ornamental Rock Mulch

Description: This item consists of furnishing all labor, equipment and material necessary to install ornamental rock at the locations shown on the plans or as directed.

Materials: Ornamental rock material shall consist of ¾ inch minus black and tan perma bark ornamental rock mulch.

Workmanship: Ornamental rock to be placed at a depth of three (3) inches.

Measurement and Payment: Ornamental Rock will be measured per cubic yard and shall include all labor, equipment and material necessary for the completion of the bid item.

ITEM 29, “VARIATIONS IN QUANTITIES”, ON PAGE GC16 OF THE ACHD GENERAL CONDITIONS, SECOND PARAGRAPH, shall not apply to this bid item.

Payment for this item will be made under:

SP 25002 Ornamental Rock ..........................Per Cubic Yard

6. SSP 20221 Plant Establishment Plan

Description: This item includes all costs to prepare and implement a plant establishment plan.

Workmanship: From the time of installation, during construction, and throughout the establishment period the Contractor shall maintain all plant material and seeded areas in a healthy and vigorous growing condition, and ensure the successful establishment of vegetation. This includes performing establishment, replacement work, and landscape maintenance work as described below.

The Contractor shall submit a first-year plant establishment plan, for approval by the Engineer. The first year of plant establishment shall begin immediately upon written notification from the Engineer of the completion of initial planting for the project. The first year plant establishment period shall be a minimum of 1 calendar year. During the first-year plant establishment period, the Contractor shall perform all Work necessary to ensure the growth of the planted material. This care shall include, but not be limited to, labor and materials necessary for removal of foreign, dead, or rejected plant material, maintaining a weed-free condition, the replacement of all unsatisfactory plant material planted under the Contract, and periodic watering as required for proper plant establishment. If plants are stolen or damaged by the acts of others, ACHD will pay invoice cost only for the replacement plants with no mark-up and the Contractor will be responsible for the labor to install the replacement plants.

During the plant establishment period, the Contractor shall meet with the Engineer between April and October for the purpose of joint inspection of the planting material on a mutually agreed upon schedule.

The Contractor shall correct all conditions unsatisfactory to the Engineer within a 10-day period immediately following the inspection.

1. Live Plants If plant replacement is required, the Contractor shall, within the 10-day period, submit a plan and schedule for the plant replacement to occur immediately at the beginning of the planting period. At the end of the plant establishment period, plants that do not show normal growth shall be replaced.

The Contractor shall water, cultivate, and prune the plants as required or directed by the Engineer. The Contractor shall reshape plant saucers, repair washouts and gullies, replace lost wood chip mulch, keep all planting sites free from weeds and do other work necessary to maintain the plants in a healthy and vigorous growing condition. This includes seasonal spraying or deep root watering with approved insecticides or fungicides as required.

2. Seeded Areas The Contractor shall restore and reseed eroded areas and areas of poor establishment.

Payment for water used to water in plants, or hand watering of plant material or lawn areas unless otherwise specified, is the responsibility of the Contractor during the first-year plant establishment period. Subsequent year plant establishment periods, when included in the Contract, shall begin immediately at the completion of the preceding year’s plant establishment period. Each subsequent year plant establishment period shall be one (1) full calendar year in duration.

Payment for these items will be made under the following:

SSP 20221 Plant Establishment Plan……………………………………………………………………Per Year

7. SP 29110 Irrigation System

Description:

Design and installation of an automatic irrigation system to provide adequate watering to all trees and shrubs within the project site.

AVAILABLE PRESSURE AND FLOW

A. Available pressure – 80 psi at City Meter.

B. Available flow – 50 gallons per minute.

PERFORMANCE REQUIREMENTS

A MINIMUM WORKING-PRESSURE RATINGS

1. Irrigation Main Piping: 200 psig (1380 kPa).

2. Lateral Piping: 200 psig (1035 kPa).

3. Drain Piping: 100 psig (690 kPa).

B. WATER SOURCE

1. The water source use for the irrigation system is located near the Right of Way, back of sidewalk.

C. IRRIGATION ZONES

1. Design zones to provide adequate water supply throughout project

2. Trees and shrubs shall be on separate zones from lawn/grass/ground cover zones.

D. MINIMUM PIPE SIZES

1. All main line pipes shall be sized per plan and 200 psi rated PVC

2. All lateral pipes shall be sized per plan and 200 psi rated PVC

E. VALVE BOX LOCATION

1. All valve boxes shall be placed inside the fenced area and located per plan.

Materials:

PIPE AND FITTINGS

A. IRRIGATION LATERALS shall be 200 PSI PVC.

B. MAINLINE PIPE shall be 200 psi PVC. All mainline fittings shall be 316 stainless steel. Valve assemblies shall have 316 stainless steel threaded fittings.

C. SLEEVES shall be class 200 PVC pipe (HDPE Polyethylene pipe when boring is required). Sleeve diameter shall be one size larger than the sum of the two largest pipes installed in the sleeve.

D. CONTROL VALVE BOXES: shall be traffic rated for HS-20, constructed of concrete with 3/16 steel diamond plate lids.

E. DRIPLINE shall be Netafim TLHCVXR5-18##.

F. Valves

1. Quick Coupling Valve: Rainbird 44-RC or approved equal. Provide valve keys. Place quick coupling valves as needed to blow out system. Min. (2) quick couplers for the project.

2. Irrigation Control Valves: Rain Bird 200-PESB-PRS-D Electric Remote Control Valves or approved equal. Install with unions on both sides of valve.

3. Drip Control Valves: Netafim LVCZS8010075-LF Electric Remote Control Valves or approved equal. Install with unions on both sides of valve.

4. Drain Valves: Manual Drain Valves: 3/4" Mueller Orseal weld top valves or approved equal. Install on main lines and in all valve boxes on lateral lines.

5. Gate Valves: 2” Leemco LMV-LGT-W stainless steel, or approved equal.

G. CONTROL WIRING: 24 volt communication wire shall be 14-1 PE direct burial, control wire, color red. Common wire isahh be 12-1 direct burial control wire, color white. Use waterproof wire connectors for all wire splices. All connections and splices shall be inside valve boxes.

Acceptable manufacturers for wire connectors:

H. DBY-R by 3M, King "One Step" or approved equal.

I. EXPANSION CURLS: Expansion curls shall be provided within three (3) feet of each wire connection to solenoid and at least every three hundred (300) feet in length.

J. OTHER COMPONENTS shall be supplied to provide a fully functional system

MAIN LINE CONNECTION MATERIALS

A. Sch. 40 PVC

Workmanship:

INSTALLATION

A. Install pipe depths per the following:

a. Minimum lateral depth shall be 12”

b. Minimum mainline depth shall be 18”

c. Minimum sleeve depth shall be 18”

d. Bed all pipe as per detailed in the drawings.

B. Control Valves shall be installed inside a jumbo rectangular valve box. Top of box shall be flush with the adjacent surface in which it is installed.

C. All drip tubing shall be spaced at 12” between lines and shall be stapled every 10’ maximum, or at every change in direction.

D. All mainline and lateral piping shall be flushed prior to installing drip irrigation.

E. Contractor shall appropriately schedule irrigation to establish plant material throughout construction activities. Irrigation schedules shall be monitored and adjusted daily to promote adequate irrigation without over saturating the plant material.

F. Contractor shall be required to educate Owner on the operation and maintenance of the irrigation system prior to final completion, including winterization, spring start-up, controller operation and maintenance of all components.

G. As part of the scope of work following final completion Contractor shall provide and perform one spring start up and one winterization.

H. Contractor assumes responsibility of irrigation system until final approval by Landscape Architect.

A. Irrigation System: By the lump sum. Includes materials, equipment, and labor for irrigation system design and installation, including connection to existing water service, valving, electrical controls, boring, sleeves, piping, emitters, and boxes.

SP 29110 Irrigation System.......................................................................................Lump Sum

8. SSP 25050B 12” Topsoil

Description: This item shall include all work and costs associated with installing 12” of compacted topsoil in the areas as shown on the construction plans or as directed by the Engineer.

Materials: Topsoil shall be friable, fertile, agricultural soil, containing normal amounts of macro and micro nutrients capable of sustaining vigorous plant growth. It shall be of uniform composition throughout, without admixture of subsoil. It shall be free of stones 1” (one inch) or larger, lumps, sticks, live plants and their root, and other extraneous matter. It shall not be infested with nematodes or other pest or disease organisms. It shall be free of seed of noxious weeds and other material detrimental to vegetative growth. ACHD reserves the right to request soil samples be tested at the Contractor’s expense to verify the topsoil is capable of sustaining vigorous plant growth

Workmanship: Topsoil shall not be placed in its final position until the areas to be covered have been properly prepared and grading operations in the area have been substantially complete. Topsoil shall be placed and spread at locations shown on the plans and thickness of topsoil placement shall be 12” (four inches) when compacted.

Measurement and Payment: Measurement for this item shall consist of placement of topsoil to a 12” depth on a per cubic yard basis.

ITEM 29, “VARIATIONS IN QUANTITIES,” ON PAGE GC16 OF THE ACHD GENERAL CONDITIONS, SECOND PARAGRAPH, shall not apply to this bid item.

SSP 25050B 12” Topsoil……………………………………………………………………………………Per Cubic Yard