329000-Planting.pdf

Batavia VAMC Contract #36C24219C0228

Improve Ground Water, Building 30 Project #528A4-18-203

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SECTION 32 90 00

PLANTING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Plants, soils, edging, turf, and landscape materials.

2. This specification is for the lawn and landscaping restoration.

1.2 RELATED REQUIREMENTS

1.3 DEFINITIONS

A. Pesticide: Any substance or mixture of substances, including biological control agents, that may prevent, destroy, repel, or mitigate pests and is specifically labeled for use by U.S. Environmental Protection Agency

(EPA). Also, any substance used as plant regulator, defoliant, disinfectant, or biocide.

B. Planter Bed: An area containing one or combination of following plant types: shrubs, vines, wildflowers, annuals, perennials, ground cover, excluding turf. Trees may also be found in planter beds.

C. Stand of Turf: 95 percent of established species.

1.4 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. American National Standards Institute (ANSI):

1. Z60.1-2014 - Nursery Stock.

C. American Society for Testing And Materials (ASTM):

1. B221-14 - Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes.

2. B221M-13 - Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes.

3. C33/C33M-16-Concrete Aggregates.

4. C136/C136M-14 - Sieve Analysis of Fine and Coarse Aggregates.

5. C602-13a - Agricultural Liming Materials.

6. D977-13e1 - Emulsified Asphalt.

7. D5268-13 - Topsoil Used for Landscaping Purposes.

D. Hortus Third: Concise Dictionary of Plants Cultivated in United States and Canada.

E. Tree Care Industry Association (TCIA):

1. A300P1-2008 - Tree Care Operations - Trees, Shrubs and Other Woody

Plant Maintenance Standard Practices (Pruning).

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2. Z133.1-2012 - Arboricultural Operations - Safety Requirements.

F. Turfgrass Producers International (TPI):

1. 2006 Guideline Specifications to Turfgrass Sodding.

G. United States Department of Agriculture (USDA):

1. DOA SSIR 42-2014 - Soil Survey Laboratory Methods Manual.

2. Handbook No. 60 - Diagnosis and Improvement of Saline and Alkali

Soils.

1.5 PREINSTALLATION MEETINGS

A. Conduct preinstallation meeting at project site minimum 30 days before beginning Work of this section.

1. Required Participants:

a. Contracting Officer's Representative.

b. Architect/Engineer.

c. Contractor.

d. Installer.

2. Meeting Agenda: Distribute agenda to participants minimum 3 days before meeting.

a. Inspection of planting materials.

b. Installation schedule.

c. Installation sequence.

d. Preparatory work.

e. Protection before, during, and after installation.

f. Installation.

g. Inspecting.

h. Environmental procedures.

3. Document and distribute meeting minutes to participants to record decisions affecting installation.

1.6 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Manufacturer's Literature and Data:

1. Description of each product.

2. Installation instructions.

3. Warranty.

C. Test reports: Certify products comply with specifications.

D. Certificates: Certify products comply with specifications.

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1. Plant Materials: Department of Agriculture certification by State

Nursery Inspector declaring material to be free from insects and disease.

2. Seed and Turf Materials: Notarized certificate of product analysis.

E. Qualifications: Substantiate qualifications comply with specifications.

1. Installer, including supervisor with project experience list.

F. Operation and Maintenance Data:

1. Care instructions for each plant material.

1.7 QUALITY ASSURANCE

A. Installer Qualifications:

1. Regularly installs specified products.

2. Installed specified products with satisfactory service on five similar installations for minimum five years.

a. Project Experience List: Provide contact names and addresses for completed projects.

B. Independent or university laboratory, recognized by State Department of

Agriculture, with experience and capability to conduct testing indicated and that specializes in types of tests to be performed.

C. Contracting Officer’s Representative may review plant materials either at place of growth or project site before planting for compliance with requirements. Contracting Officer’s Representative retains right to inspect trees and shrubs to determine if any unacceptable conditions exist and to reject any trees or shrubs at any time during Project. All rejected trees and shrubs must be immediately removed from Project site.

1. Submit plant material source information to Contracting Officer’s

Representative seven days in advance of delivery to Project site.

D. Material Test Reports: For existing native surface topsoil and imported or manufactured topsoil.

1. For each unamended soil type, provide soil analysis and written report by qualified soil-testing laboratory stating percentages of organic matter; gradation of sand, silt, and clay content; cation exchange capacity; sodium absorption ratio; deleterious material;

pH; and mineral and plant-nutrient content of soil.

2. Comply with USDA's Handbook No. 60 testing methods and written recommendations.

3. Soil-testing laboratory to oversee soil sampling; with depth, location, and number of samples to be taken per instructions from

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Contracting Officer’s Representative. Take minimum 3 representative samples from varied locations for each soil to be used or amended for planting purposes.

4. Report suitability of tested soil for plant growth.

5. Based on test results, state recommendations for soil treatments and soil amendments to be incorporated. State recommendations in weight per 92.9 sq. m (1000 sq. ft.) or volume per 0.76 cu. m (1 cu. yd.)

for nitrogen, phosphorus, and potash nutrients and soil amendments to be added to produce satisfactory planting soil suitable for healthy, viable plants.

6. Report presence of problem salts, minerals, or heavy metals, including aluminum, arsenic, barium, cadmium, chromium, cobalt, lead, lithium, and vanadium. If such problem materials are present, provide additional recommendations for corrective action.

1.8 DELIVERY

A. Deliver packaged products in manufacturer's original sealed packaging.

B. Bulk Products:

1. Deliver bulk products away from buildings, utilities, pavement, and existing turf and planted areas. Maintain dry bulk product storage away from contaminants.

2. Install erosion control materials to prevent erosion or displacement of bulk products.

C. Apply antidesiccant to trees and shrubs according to manufacturer's instructions to protect during digging, handling, and transportation.

1. For deciduous trees or shrubs in full leaf, spray with antidesiccant at nursery before transporting and again two weeks after planting.

D. Use of equipment such as "tree spades" is permitted provided plant balls are sized according to ANSI Z60.1 and tops are protected from damage.

1.9 STORAGE AND HANDLING

A. Store seeds and other packaged materials in dry locations away from contaminants.

B. Topsoil: Before stockpiling topsoil, eradicate on site undesirable growing vegetation. Clear and grub existing vegetation three to four weeks before stockpiling existing topsoil.

1.10 FIELD CONDITIONS

A. Environment:

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1. Coordinate installation of planting materials during optimal planting seasons for each type of plant material required.

2. Planting Dates:

a. Deciduous Material: From May 15 to August 15 for spring planting and seed after August 15 for fall planting.

3. Restrictions: Do not plant when ground is frozen, snow covered, muddy, or when air temperature exceed 32 degrees C

(90 degrees F).

B. Weather Limitations: Install plantings only during current and forecasted weather conditions that are comply with plant requirements.

Apply associated products in compliance with manufacturers' instructions.

1.11 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of

Construction."

B. Manufacturer's Warranty: Warrant plantings and against material defects.

1. Warranty Period: Two years.

2. Plant and Turf Warranty Periods will begin from date of Government acceptance of project or phase for beneficial use and occupancy.

3. Contracting Officer's Representative will reinspect plants and turf at end of Warranty Period. Replace any dead, missing, or defective plant material and turf immediately. Warranty Period will end on date of this inspection provided Contractor has complied with warranty work required by this specification. Comply with following requirements:

a. Replace any plants more than 25 percent dead, missing or defective plant material before final inspection.

b. Only one replacement of each plant will be required except when losses or replacements are due to failure to comply with these requirements.

c. Complete remedial measures directed by Contracting Officer’s

Representative to ensure plant and turf survival.

d. Repair damage caused while making plant or turf replacements.

PART 2 - PRODUCTS

2.1 PRODUCTS - GENERAL

A. Provide each product from one source or manufacturer.

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B. Sustainable Construction Requirements:

1. Select products with recycled content to achieve overall Project recycled content requirement.

a. Fertilizer.

b. Weed control fabric.

c. Root control barrier.

2. Steel Recycled Content: 30 percent total recycled content, minimum.

3. Aluminum Recycled Content: 50 percent total recycled content, minimum.

4. Biobased Content:

a. Organic Mulch: 100 percent.

b. Peat: 100 percent.

2.2 PLANT MATERIALS

A. Plant Materials: ANSI Z60.1, conforming to varieties specified and be true to scientific name as listed in Hortus Third. Well-branched, well-formed, sound, vigorous, healthy planting stock free from disease, sunscald, windburn, abrasion, and harmful insects or insect eggs and having healthy, normal, and undamaged root system.

1. Ground Cover and Vine Plants: Provide number and length of runners for size specified on drawings, together with proper age for grade of plants specified. Provide vines and ground cover plants well established in removable containers, integral containers, or formed homogeneous soil sections. Provide plants grown under climatic conditions similar to those in locality of project. Spray all plants budding into leaf or having soft growth with an anti-desiccant at nursery before digging.

2. Provide plants of sizes indicated, measured before pruning with branches in normal position. Plants larger in size than specified is acceptable with approval of Contracting Officer’s Representative, with no change in contract price. When larger plants are used, increase ball of earth or spread of roots according to ANSI Z60.1.

3. Provide nursery grown plant material conforming to requirements and recommendations of ANSI Z60.1. Dig and prepare plants for shipment in manner that will not cause damage to branches, shape, and future development after planting.

4. Container grown plants to have sufficient root growth to hold earth intact when removed from containers, but not be root bound.

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5. Make substitutions only when plant (or alternates as specified) is not obtainable and Contracting Officer’s Representative authorizes change order providing for use of nearest equivalent obtainable size or variety of plant with same essential characteristics and an equitable adjustment of contract price.

6. Existing plants to be relocated: Ball sizes to conform to requirements for collected plants in ANSI Z60.1, and plants dug, handled, and replanted according to applicable articles of this

Section.

7. Only plants grown in nursery are permitted.

B. Label plants with durable, waterproof labels in weather-resistant ink.

Provide labels stating correct botanical and common plant name and variety and size as specified in list of required plants. Groups of plants may be labels by tagging one plant. Labels to be legible for minimum 60 days after delivery to planting site.

2.3 SOD

A. Sod: Nursery grown, certified and classified in TPI's "Guideline

Specifications to Turfgrass Sodding" as GSS. Machine cut sod at uniform thickness of 19 mm (3/4 inch) within tolerance of 6 mm (1/4 inch), excluding top growth and thatch. Each individual sod piece to be strong enough to support its own weight when lifted by ends. Broken pads, irregularly shaped pieces, and torn or uneven ends will not be permitted.

B. Sod Species: Genetically pure, free of weeds, pests, and disease.

1. Sun and Partial Shade: Proportion grass species as follows:

a. 90 percent blend of two turf-type tall fescues.

b. 10 percent blend of two or more improved Kentucky bluegrass varieties.

2.4 SEED

A. Grass Seed: State-certified seed of latest season's crop delivered in original sealed packages, bearing producer's guaranteed analysis for percentages of mixtures, purity, germination, weed seed content, and inert material. Label in conformance with AMS Seed Act and applicable state seed laws. Wet, moldy, or otherwise damaged seed will not be acceptable. Field mixes will be acceptable when field mix is performed on site in presence of Contracting Officer's Representative.

B. Seed Mixtures: Proportion seed mixtures by weight.

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1. Full Sun: Proportioned grass species as follows:

a. 65 percent Creeping red fescue.

b. 20 percent Perennial ryegrass.

c. 15 percent Fine fescue.

2.5 TURF SELECTIONS (NOT USED)

2.6 SPRIGS (NOT USED)

2.7 PLUGS (NOT USED)

2.8 PLANTING SOILS

A. Planting Soil: Evaluate soil for use as topsoil according to

ASTM D5268. From 5 to 10 percent organic matter as determined by topsoil composition tests of Organic Carbon, 6A, Chemical Analysis

Method described in USDA DOA SSIR 42. Maximum particle size, 19 mm

(3/4 inch), with maximum 3 percent retained on 6 mm (1/4 inch) screen.

Mix topsoil with following soil amendments and fertilizers as recommended by soils analysis.

B. Existing Planting Soil: Existing, native surface topsoil formed under natural conditions retained during excavation process and stockpiled on-site. Verify suitability of native surface topsoil to produce viable planting soil. Clean soil of roots, plants, sod, stones, clay lumps, and other extraneous materials harmful to plant growth.

1. Supplement with planting soil when quantities are insufficient.

2. Mix existing, native surface topsoil with soil amendments and fertilizers as recommended by soils analysis.

C. Imported Planting Soil: Imported topsoil or manufactured topsoil from off-site sources are acceptable if sufficient topsoil is not available on site to meet specified depth. At least 10 days before topsoil delivery, notify Contracting Officer’s Representative of topsoil sources. Obtain imported topsoil displaced from naturally well-drained construction or mining sites where topsoil is at least 100 mm

(4 inches) deep. Topsoil from agricultural land, bogs, or marshes will be rejected. Obtain topsoil from local sources that best match existing conditions.

2.9 INORGANIC SOIL AMENDMENTS

A. Lime: Commercial grade limestone containing calcium carbonate equivalent (CCE) specified in ASTM C602 of minimum 80 percent.

B. Sulfur: 100 percent elemental.

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C. Iron Sulfate: 100 percent elemental.

D. Aluminum Sulfate: Commercial grade.

E. Perlite: Horticultural grade.

F. Agricultural Gypsum: Coarsely ground from recycled scrap gypsum board comprised of calcium sulfate dehydrate 91 percent, calcium 22 percent, sulfur 17 percent, minimum 96 percent passing through 850 micrometers

20 mesh screen, 100 percent passing through 970 micrometers 16 mesh screen.

G. Coarse Sand: ASTM C33/C33M, clean and free of materials harmful to plants.

H. Vermiculite: Horticultural grade for planters.

I. Diatomaceous Earth: Calcined, 90 percent silica, with approximately 140 percent water absorption capacity by weight.

J. Zeolites: Mineral clinoptilolite with at least 60 percent water absorption by weight.

2.10 ORGANIC SOIL AMENDMENTS

A. Organic Matter: Commercially prepared compost. Free of substances toxic to plantings and as follows:

1. Organic Matter Content: wood chips, ground or shredded bark, pine straw mulch from project site when available. Biobased content 100 percent. Wood cellulose fiber processed to contain no growth or germination-inhibiting factors, dyed with non-toxic, biodegradable dye to appropriate color to facilitate visual metering of materials application.

2. Feedstock: Agricultural, food, or industrial residuals; biosolids;

yard trimmings; or source-separated or compostable mixed solid waste.

B. Peat: Natural product of conforming to ASTM D4427 and containing no invasive species, including seeds. Shred and granulate peat to pass

12.5 mm (1/2 inch) mesh screen and condition in storage pile for minimum 6 months after excavation. Biobased content minimum 100 percent.

C. Composted Derivatives: Ground bark, nitolized sawdust, humus, or other green wood waste material free of stones, sticks, invasive species, including seeds, and soil stabilized with nitrogen and having following properties:

1. Particle Size: Minimum percent by weight passing:

a. 4.75 mm (No. 4) mesh screen: 95.

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b. 2.36 mm (No. 8) mesh screen: 80.

2. Nitrogen Content: Minimum percent based on dry weight:

a. Fir sawdust: 0.7.

b. Fir or pine bark: 1.0.

3. Biobased Content: 100 percent.

D. Manure: Well-rotted, horse or cattle manure containing maximum 25 percent by volume of straw, sawdust, or other bedding materials; free of seeds, stones, sticks, soil, and other invasive species.

2.11 PLANT FERTILIZERS

A. Soil Test: Evaluate existing soil conditions and requirements before fertilizer selection and application to minimize use of all fertilizers and chemical products. Obtain approval of Contracting Officer’s

Representative for allowable products, product alternatives, scheduling and application procedures. Evaluate existing weather and site conditions before application. Apply products during favorable weather and site conditions according to manufacturer's instructions and warranty requirements. Fertilizers to be registered and approved by

EPA, acceptable to authorities having jurisdiction, and of type recommended by manufacturer applicable to specific areas as required for Project conditions and application. Provide commercial grade plant and turf fertilizers, free flowing, uniform in composition and conforms to applicable state and federal regulations.

B. Fertilizer for groundcover, wildflowers, and grasses is not acceptable.

Provide fertilizer for trees, plants, and shrubs as recommended by plant supplier, except synthetic chemical fertilizers are not acceptable. Fertilizers containing petrochemical additives or that have been treated with pesticides or herbicides are not acceptable.

C. Granular Fertilizer: Organic, granular controlled release fertilizer containing minimum percentages, by weight, of plant food nutrients.

1. Composition: Nitrogen, phosphorous, potassium, sulfur, and iron in amounts recommended in soil reports from qualified soil-testing laboratory.

D. Fertilizer Tablets: Organic plant tablets composed of tightly compressed fertilizer chips, insoluble in water, to provide continuous release of nutrients for minimum 24 months and containing following minimum percentages, by weight, of plant food nutrients:

1. Nutrient Composition: 20 percent available nitrogen, 20 percent available phosphorous, and 5 percent available potassium.

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2.12 WEED CONTROL FABRIC

A. Roll Type Polypropylene or Polyester Mats: Woven, needle punched, or non-woven fabric treated for protection against deterioration due to ultraviolet radiation. Minimum 99 percent opaque to prevent photosynthesis and seed germination, fabric allows air, water, and nutrients to pass through to plant roots.

1. Minimum weight: 0.11 kg per square meter (5 ounces per square yard).

2. Minimum thickness: 0.50 mm (20 mils).

2.13 MULCH (NOT USED)

2.14 EDGING (NOT USED)

2.15 ANTIDESICCANT

A. Antidesiccant: An emulsion specifically manufactured for agricultural use that will provide protective film over plant surfaces permeable enough to permit transpiration.

2.16 EROSION CONTROL

A. Temporary Erosion Control Blankets: 100 percent agricultural straw stitched with degradable nettings, designed to degrade within 12 months.

B. Permanent Erosion Control Blankets: 100 percent UV stable polypropylene fiber, designed to be non-degradable.

C. Erosion Control Fabric: Knitted construction of polypropylene yarn with uniform mesh openings 19 to 25 mm (3/4 to 1 inch) square with strips of biodegradable paper. Minimum filler paper strip life of six months.

D. Erosion Control Material Anchors: As recommended by erosion control material manufacturer.

2.17 ROOT CONTROL BARRIER (NOT USED)

2.18 BIOSTIMULANTS (NOT USED)

2.19 STAKING AND GUYING MATERIALS (NOT USED)

2.20 TREE WRAP (NOT USED)

2.21 TACKIFIERS AND ADHESIVES

A. Nonasphalt Tackifier: Colloidal liquid fixative recommended by fiber mulch manufacturer for hydroseeding.

B. Asphalt emulsion: ASTM D977, Grade SS-1.

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2.22 WATER

A. Water: Source approved by Contracting Officer's Representative and suitable quality for irrigation, containing no elements toxic to plant life, including acids, alkalis, salts, chemical pollutants, and organic matter. The contractor shall be responsible to water all plantings, seeded areas, and hydro-seeded areas daily with a water truck until the disturbed areas have achieved final stabilization and approved by the

COR. Final stabilization occurs when the disturbed area has 70% uniform perennial cover with a density sufficient to resist accelerated surface erosion and substance characteristics sufficient to resist sliding or other movements.

2.23 PESTICIDES

A. Consider IPM (Integrated Pest Management) practices to minimize use of all pesticides and chemical products. Obtain Contracting Officer's

Representative's approval for allowable products, product alternatives, scheduling and application procedures. Evaluate existing weather and site conditions before application. Apply products during favorable weather and site conditions according to manufacturer's instructions and warranty requirements.

2.24 FINISHES (NOT USED)

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas to receive plants for compliance with requirements and conditions affecting installation and performance.

1. Verify that no materials that would inhibit plant growth are present in planting area. If such materials are present, remove soil and contaminants ad directed by Contracting Officer's Representative and provide new planting soil.

2. Do not mix or place soils and soil amendments in frozen, wet, or muddy conditions.

3. Suspend soil spreading, grading, and tilling operations if soil moisture becomes excessive. Resume soil preparations when moisture content returns to acceptable level.

4. If soil is excessively dry, not workable, and too dusty, moisten uniformly.

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5. Special conditions may exist that warrant variance in specified planting dates or conditions. Submit written request to Contracting

Officer’s Representative stating special conditions and proposed variance.

B. Proceed with planting operations only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Protect existing and proposed landscape features, elements, and site construction and completed work from damage. Protect trees, vegetation, and other designated features by erecting high-visibility, reusable construction fencing. Locate fence no closer to trees than drip line.

Plan equipment and vehicle access to minimize and confine soil disturbance and compaction to areas indicated on drawings.

B. Install erosion control materials at all areas inside or outside limits of construction that are disturbed by planting operations. Provide erosion control and seeding with native plant species to protect slopes.

3.3 PLANT BED PREPARATION (NOT USED)

3.4 GROUND COVER AND PLANT INSTALLATION (NOT USED)

3.5 TREE, SHRUB, AND VINE PLANTING (NOT USED)

3.6 MECHANIZED TREE SPADE PLANTING (NOT USED)

3.7 TREE WRAP (NOT USED)

3.8 TREE AND SHRUB PRUNING (NOT USED)

3.9 STAKING AND GUYING (NOT USED)

3.10 ROOT CONTROL BARRIER INSTALLATION (NOT USED)

3.11 MULCH INSTALLATION (NOT USED)

3.12 EDGING INSTALLATION (NOT USED)

3.13 SODDING

A. Place sod maximum 36 hours after initial harvesting according to

TPI GSS, except as modified herein.

B. Finishing: After sodding, blend edges of sodded area smoothly into surrounding area. Eliminate air pockets and provide true and even surface. Trim frayed areas and patch holes and missing areas with sod.

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C. Rolling: Immediately after sodding, firm entire area, except slopes in excess of 3: 1, with roller maximum 134 kg (90 lbs.) for each foot of roller width.

D. Watering: Start watering sodded areas as required by daily temperature and wind conditions. Water at rate sufficient to ensure thorough wetting of soil to minimum 150 mm (6 inches) deep. Prevent run-off, puddling, and wilting. Do not drive watering trucks over turf areas, unless otherwise directed. Prevent watering of other adjacent areas or plant materials.

3.14 SPRIGGING (NOT USED)

3.15 PLUGGING (NOT USED)

3.16 SEEDING (NOT USED)

3.17 HYDROSEEDING

A. Mix water with wood cellulose fiber, paper fiber, or recycled paper at rate of 11.2 kg per 100 square meters (1,000 lb. per acre) dry weight.

Add seed and fertilizer to fiber and water and mix to produce homogeneous slurry.

1. Broadcast seed mixture at rate per manufacturer’s specifications.

2. Hydraulically spray slurry to form uniformly impregnated grass seed cover. Spread with one application with no second application of mulch.

3.18 TURF RENOVATION

A. General: Restore to original condition existing turf areas damaged during turf installation and construction operations. Keep at least one paved pedestrian access route and one paved vehicular access route to each building clean at all times. Clean other paving when work in adjacent areas is complete.

B. Aeration: Eradicate weeds and, with Contracting Officer's

Representative's approval to proceed, aerate turf areas with approved device. Core, by pulling soil plugs to minimum 76 mm (3 inches) deep.

Leave all soil plugs that are produced, in turf area. Clean all soil plugs off of other paving when work is complete.

C. Vertical Mowing: At completion of aerating and, with Contracting

Officer's Representative's approval to proceed, vertical mow turf areas indicated on drawings with approved device to 13 mm (1/2 inch) deep

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D. Dethatching: At completion of aerating and, with Contracting Officer's

Representative's approval to proceed, dethatch turf areas indicated on drawings with approved device to 13 mm (1/2 inch) deep below existing soil level to reduce thatch build-up, grain, and surface compaction.

Remove all debris generated during this operation off site.

E. Overseeding: Apply seed according to applicable portions of "Seed

Application Method" at rates specified in "Seed Composition."

3.19 PLANT MAINTENANCE

A. Frequency: Begin maintenance immediately after plants have been installed. Inspect plants at least once week and perform required maintenance promptly.

B. Promotion of Plant Growth and Vigor: Water, prune, fertilize, mulch, eradicate weeds, and perform other operations necessary to promote plant growth and vigor.

3.20 SLOPE EROSION CONTROL MAINTENANCE

A. Provide slope erosion control maintenance to prevent undermining of all slopes in newly landscaped and natural growth areas. Maintenance tasks include immediate repairs to weak spots in sloped areas and maintaining clean, clear culverts and graded to intercept and direct water flow to prevent development of large gullies and slope erosion and securing irrigation systems during periods of extended rainfall .

1. Fill eroded areas with amended topsoil and replant with same plant species.

2. Reinstall erosion control materials damaged due to slope erosion.

3.21 REMOVAL OF DYING OR DEAD PLANTS

A. Remove dead and dying plants and provide new plants immediately upon commencement of specified planting season and replace mulch, and eroded earth mound water basins. No additional correction period will be required for replacement plants beyond original warranty period. Plants will be considered dead or dying as follows:

1. Tree: Main leader died back or minimum 20 percent of crown died.

2. Shrub and Ground Cover: Minimum 20 percent of plant died.

3. Determination: Scrape on maximum 2 mm (1/16 inch) square branch area to determine dying plant material cause and provide recommendations for replacement.

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3.22 TURF MAINTENANCE

A. Mow turf to uniform finished height measured from soil. Perform mowing in manner that prevents scalping, rutting, bruising, uneven and rough cutting. Before mowing, remove and dispose of all rubbish, debris, trash, leaves, rocks, paper, and limbs or branches on turf areas. Sweep or vacuum clean adjacent paved areas.

B. Apply fertilizer in manner that promotes health, growth, vigor, color and appearance of cultivated turf areas. Determine method of application, fertilizer type and frequencies by results of laboratory soil analysis. Provide organic fertilizer. If organic fertilizer does not produce desired effect, contact Contracting Officer's

Representative for approval before applying synthetic fertilizer. Apply fertilizer by approved methods and according to manufacturer's instructions.

C. Watering: Perform irrigation in manner that promotes health, growth, color, and appearance of cultivated vegetation, complying with Federal, State, and local water agency and authority directives. Prevent overwatering, water run-off, erosion, and ponding due to excessive quantities or rate of application.

D. Aeration: Eradicate weeds and, with Contracting Officer's

Representative's approval to proceed, aerate turf areas with approved device. Core, by pulling soil plugs to minimum 3 inches deep. Leave all soil plugs that are produced, in turf area. Blend all parts of topdressing mixture to uniform consistency. Clean all soil plugs off of other paving when work is complete.

3.23 CLEANING

A. Remove and legally dispose of all excess soil and planting debris.

3.24 PROTECTION

A. Protect plants from traffic and construction operations.

B. Provide temporary fences or enclosures and signage, at planted areas.

Maintain fences and enclosures during maintenance period.

C. Remove protective materials immediately before acceptance.

D. Repair damage.

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