HomeMy WebLinkAboutBID - 7511 PORTNER SUBSTATION LANDSCAPINGADDENDUM NO. 1
SPECIFICATIONS AND CONTRACT DOCUMENTS
Description of BID 7511: Portner Substation Landscaping
OPENING DATE: 3:00 PM (Our Clock) June 19, 2013
To all prospective bidders under the specifications and contract documents described
above, the following changes/additions are hereby made and detailed in the following
sections of this addendum:
1. The Opening Date has been changed to June 19, 2013 at 3:00 PM (our
clock)
2. Additional Information
Exhibit 1 – Revised Bid Form
Exhibit 2 – Revised Section 02950 - Exterior Plans
Exhibit 3 – Revised Plans L1 and L2
Please contact John Stephen, CPPO, LEED AP, Senior Buyer at (970) 221-6777 with
any questions regarding this addendum.
RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN
STATEMENT ENCLOSED WITH THE BID/QUOTE STATING THAT THIS
ADDENDUM HAS BEEN RECEIVED.
Financial Services
Purchasing Division
215 N. Mason St. 2nd Floor
PO Box 580
Fort Collins, CO 80522
970.221.6775
970.221.6707
fcgov.com/purchasing
EXHIBIT 1 – REVISED BID SCHEDULE
IN WORDS:
SUBMITTED BY:
PRINTED: DATE:
COMPANY:
ADDRESS:
CITY, STATE, ZIP:
PHONE: EMAIL:
1 Demolition - clear and grub SF 17,120 $ -
$ -
2 Berm Fill and Contouring LS 1 $ -
3 Fine Grading SF 30,120 $ -
4 Topsoil Import (4" Thick) SF 5,200 $ -
5 Compost in Sod Areas (3 yards per 1,000 square feet) SF 17,000 $ -
6 Buffalo Blend Sod SF 17,000 $ -
7 Deciduous Shrubs - 5 gal. EA 137 $ -
8 Evergreen Shrubs - 5 gal. EA 18 $ -
9 Ornamental Grasses - 1 gal. EA 77 $ -
10 Evergreen Trees 6' h. (Junipers) EA 9 $ -
11 Evergreen Trees 6' h. EA 5 $ -
12 Evergreen Trees 8' h. EA 4 $ -
13 Weed Barrier (Shrub Beds and 3' Fence Section) SF 13,240
14 Type 1 Mulch - (1.5-2" Tan Poudre River Rock) SF 13,120 $ -
15 Type 2 Mulch - (3"-6" Rose rip rap) SF 120 $ -
17 Steel Edger LF 900 $ -
18 Irrigation LS 1 $ -
19 1 Year Turf Maintenance LS 1 $ -
$ -
$ -
ITEM UNIT QTY. UNIT PRICE ITEM TOTAL
Subtotal
Subtotal
SITE & LANDSCAPE
GENERAL REQUIREMENTS
TOTAL
DESCRIPTION
EXTERIOR PLANTS 02950 - 1
SECTION 02950 – EXTERIOR PLANTS
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 01 Specification Sections, apply to this Section.
1.2 SUMMARY
A. Section Includes:
1. Warranty.
2. Maintenance Service.
3. Trees, Shrubs and Perennials.
4. Inorganic and Organic Soil Amendments.
5. Fertilizers – not required.
6. Planting soils.
7. Soil Amendments.
8. Mulch.
9. Tree stabilization.
B. Related Sections:
1. Section "Tree Protection and Trimming" for protecting, trimming, pruning, repairing, and
replacing existing trees to remain that interfere with, or are affected by execution of the
work.
2. Section "Site Clearing" for protection of existing trees and plantings, topsoil stripping
and stockpiling, and site clearing.
3. Section "Turf and Grasses" for sodding and native grass seeding.
1.3 DEFINITIONS
A. Backfill: The earth used to replace or the act of replacing earth in an excavation.
B. Balled and Burlapped Stock: Exterior plants dug with firm, natural balls of earth in which they
are grown, with ball size not less than diameter and depth recommended by ANSI Z60.1 for
type and size of tree or shrub required; wrapped, tied, rigidly supported, and drum laced as
recommended by ANSI Z60.1.
C. Balled and Potted Stock: Exterior plants dug with firm, natural balls of earth in which they are
grown and placed, unbroken, in a container. Ball size is not less than diameter and depth
recommended by ANSI Z60.1 for type and size of exterior plant required.
D. Bare-Root Stock: Exterior plants with a well-branched, fibrous-root system developed by
transplanting or root pruning, with soil or growing medium removed, and with not less than
minimum root spread according to ANSI Z60.1 for type and size of exterior plant required.
EXHIBIT 2
EXTERIOR PLANTS 02950 - 2
E. Clump: Where three or more young trees were planted in a group and have grown together as a
single tree having three or more main stems or trunks.
F. Container-Grown Stock: Healthy, vigorous, well-rooted exterior plants grown in a container
with well-established root system reaching sides of container and maintaining a firm ball when
removed from container. Container shall be rigid enough to hold ball shape and protect root
mass during shipping and be sized according to ANSI Z60.1 for type and size of exterior plant
required.
G. Finish Grade: Elevation of finished surface of planting soil.
H. Manufactured Topsoil: Soil produced off-site by homogeneously blending mineral soils or sand
with stabilized organic soil amendments to produce topsoil or planting soil.
I. Multi-Stem: Where three or more main stems arise from the ground from a single root crown or
at a point right above the root crown.
J. Planting Soil: Standardized topsoil; existing, native surface topsoil; existing, in-place surface
soil; imported topsoil; or manufactured topsoil that is modified with soil amendments and
perhaps fertilizers to produce a soil mixture best for plant growth.
K. Planting Area: Areas to be planted.
L. Subgrade: Surface or elevation of subsoil remaining after completing excavation, or top surface
of a fill or backfill, before placing planting soil.
M. Subsoil: All soil beneath the topsoil layer of the soil profile, and typified by the lack of organic
matter and soil organisms.
1.4 SUBMITTALS
A. Product Data: For each type of product indicated.
B. Samples for Verification: For each of the following:
1. 1 lb (2.2 kg) of mulch for each type, in labeled plastic bags. Each Sample shall be typical
of the lot of material to be furnished; provide an accurate representation of color, texture,
and makeup.
2. Tree stabilization materials (stakes, guys, webbing).
3. Soil Amendment (Compost): 1-quart volume of compost required; in sealed plastic bags
labeled with composition of materials by percentage of weight and source of material.
4. Trees and Shrubs: See 1.5 - D. below.
C. Product Certificates: For each type of manufactured product, from manufacturer, and
complying with the following:
1. Manufacturer's certified analysis for standard products.
2. Analysis of other materials by a recognized laboratory made according to methods
established by the Association of Official Analytical Chemists, where applicable.
EXTERIOR PLANTS 02950 - 3
D. Material Test Reports: For soil amendment (compost). Provide product name, full analysis,
supplier name and phone number.
E. Planting Schedule: Indicating anticipated planting dates for exterior plants.
F. Warranty: Sample of special warranty.
1.5 QUALITY ASSURANCE
A. Installer Qualifications: A qualified landscape installer whose work has resulted in successful
establishment of exterior plants.
B. Soil-Testing Laboratory Qualifications: An independent laboratory, recognized by the State
Department of Agriculture, with the experience and capability to conduct the testing indicated
and that specializes in types of tests to be performed.
C. Topsoil Analysis: not required.
D. Provide quality, size, genus, species, and variety of exterior plants indicated, complying with
applicable requirements in ANSI Z60.1, "American Standard for Nursery Stock."
1. Selection of exterior plants purchased under allowances will be made by Owner’s
Representative, who will tag plants at their place of growth before they are prepared for
transplanting.
E. Tree and Shrub Measurements: Measure according to ANSI Z60.1 with branches and trunks or
canes in their normal position. Do not prune to obtain required sizes. Take caliper
measurements 6 inches above the ground for trees up to 4-inch caliper size, and 12 inches above
the ground for larger sizes. Measure main body of tree or shrub for height and spread; do not
measure branches or roots tip-to-tip.
F. Observation: Owner’s Representative may observe trees and shrubs either at place of growth or
at site before planting for compliance with requirements for genus, species, variety, size, and
quality. Owner’s Representative retains right to observe trees and shrubs further for size and
condition of balls and root systems, insects, injuries, and latent defects and to reject
unsatisfactory or defective material at any time during progress of work. Remove rejected trees
or shrubs immediately from Project site.
1. Notify Owner’s Representative of sources of planting materials seven days in advance of
delivery to site.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Packaged Materials: Deliver packaged materials in original, unopened containers showing
weight, certified analysis, name and address of manufacturer, and indication of conformance
with state and federal laws if applicable.
B. Bulk Materials:
EXTERIOR PLANTS 02950 - 4
1. Do not dump or store bulk materials near structures, utilities, walkways and pavements,
or on existing turf areas or plants.
2. Provide erosion-control measures to prevent erosion or displacement of bulk materials,
discharge of soil-bearing water runoff, and airborne dust reaching adjacent properties,
water conveyance systems, or walkways.
3. Accompany each delivery of bulk fertilizers, lime (if required), and soil amendments with
appropriate certificates.
C. Deliver exterior plants freshly dug.
D. Do not prune trees and shrubs before delivery. Protect bark, branches, and root systems from
sun scald, drying, sweating, whipping, and other handling and tying damage. Do not bend or
bind-tie trees or shrubs in such a manner as to destroy their natural shape. Provide protective
covering of exterior plants during delivery. Do not drop exterior plants during delivery and
handling.
E. Handle planting stock by root ball.
F. Deliver exterior plants after preparations for planting have been completed and install
immediately. If planting is delayed more than six (6) hours after delivery, set exterior plants
and trees in shade, protect from wind and sun, and mechanical damage, and keep roots/root
balls moist and covered with bark mulch as described below:
1. Set balled stock on ground and cover ball with soil, peat moss, sawdust, or other
acceptable material.
2. Do not remove container-grown stock from containers before time of planting.
3. Water root systems of exterior plants stored on-site with a fine-mist spray. Water as
often as necessary to maintain root systems in a moist condition.
1.7 PROJECT CONDITIONS
A. Field Measurements: Verify actual grade elevations, service and utility locations, irrigation
system components, and dimensions of plantings and construction contiguous with new
plantings by field measurements before proceeding with planting work.
B. Interruption of Existing Services or Utilities (including agricultural ditches): Do not interrupt
services or utilities to facilities occupied by the City or others unless permitted under the
following conditions and then only after arranging to provide temporary services or utilities
according to requirements indicated:
1. Notify the City no fewer than two days in advance of proposed interruption of each
service or utility.
C. Do not proceed with interruption of services or utilities without Owner's written permission.
D. Planting Restrictions: Plant during one of the following periods. Coordinate planting periods
with maintenance periods to provide required maintenance from date of Substantial Completion.
1. Spring Planting: March 15 through June 1.
2. Fall Planting: September 1 through October 15.
EXTERIOR PLANTS 02950 - 5
E. Weather Limitations: Proceed with planting only when existing and forecasted weather
conditions permit planting to be performed when beneficial and optimum results may be
obtained.
F. Coordination with Seeded and Sodded areas: Plant trees and shrubs after finish grades are
established and before seeding or sodding.
1. When planting trees and shrubs or other plants after installed seeded or sod, protect turf
areas and promptly repair damage caused by planting operations.
1.8 WARRANTY
A. Special Warranty: Installer agrees to repair or replace plantings and accessories that fail in
materials, workmanship, or growth within specified warranty period.
1. Failures include, but are not limited to, the following:
a. Death and unsatisfactory growth, except for defects resulting from lack of adequate
maintenance, neglect, abuse by the City, or incidents that are beyond Contractor's
control.
b. Structural failures including plantings falling or blowing over.
c. Faulty performance of tree stabilization.
d. Deterioration of metals, metal finishes, and other materials beyond normal
weathering.
2. Warranty Periods from Date of Substantial Completion:
a. Trees and Shrubs: One year.
b. Ornamental Grasses: One year.
c. Ground Cover, Perennials and other Plants: One year.
3. Include the following remedial actions as a minimum:
a. Immediately remove dead plants and replace in the succeeding planting season.
b. Replace exterior plants that are more than 25 percent dead or in an unhealthy
condition at end of warranty period.
c. A limit of one (1) replacement of each exterior plant will be required except for
losses or replacements due to failure to comply with requirements.
d. Provide extended warranty for replaced plant materials; warranty period equal to
original warranty period.
1.9 MAINTENANCE SERVICE
A. Initial Maintenance Service for Trees, Shrubs, Ornamental Grasses and Perennials: Provide full
maintenance by skilled employees of landscape Installer. Maintain as required in Part 3. Begin
maintenance immediately after each area is planted and continue until plantings are acceptably
healthy and well established, but for not less than maintenance period below.
1. Maintenance Period: From initial planning to Substantial Completion.
EXTERIOR PLANTS 02950 - 6
B. Continuing Maintenance Proposal: not required. City will take over maintenance
responsibilities following Substantial Completion.
1.10 ADDITIONAL REQUIREMENTS
A. All workmanship, products, materials and methods shall meet the current City of Boulder
Design and Construction Standards. Contractor is solely responsible for obtaining the most
current version of these standards and notifying the City’s Project Manager of and
discrepancies with these specifications prior to commencing work related to this project.
PART 2 - PRODUCTS
2.1 PLANT MATERIAL
A. General: Furnish nursery-grown plants true to genus, species, variety, cultivar, stem form,
shearing, and other features indicated in Plant Schedule or Plant Legend shown on Drawings
and complying with ANSI Z60.1; and with healthy buds, stems and bark; and healthy root
systems developed by transplanting or root pruning. Provide well-shaped, fully branched,
healthy, vigorous stock, densely foliated when in leaf and free of disease, pests, eggs, larvae,
and defects such as knots, sun scald, injuries, abrasions, and disfigurement.
1. Trees with damaged, crooked, or multiple leaders; tight vertical branches where bark is
squeezed between two branches or between branch and trunk ("included bark"); crossing
trunks; cut-off limbs more than 3/4 inch (19 mm) in diameter; with stem girdling roots; or
root flares below the top of the root ball will be rejected.
2. Collected Stock: Do not use plants harvested from the wild, from native stands, from an
established landscape planting, or not grown in a nursery unless otherwise indicated.
B. All trees and shrubs shall be freshly dug at time of delivery, unless they are container-grown.
Plants that have been heeled-in for more than 1 month or that exhibit roots outside the original
ball shall not be accepted.
C. Provide plants of sizes, grades, and ball or container sizes complying with ANSI Z60.1 for types
and form of plants required. Plants of a larger size may be used if acceptable to Architect, with
a proportionate increase in size of roots or balls.
D. Root-Ball Depth: Furnish trees and shrubs with root balls measured from top of root ball,
which shall begin at root flare according to ANSI Z60.1. Root flare shall be visible before
planting, requiring hand excavation, refer to planting details.
E. If formal arrangements or consecutive order of plants is shown on Drawings, select stock for
uniform height and spread, and number the labels to assure symmetry in planting.
2.2 ORGANIC SOIL AMENDMENTS
A. Compost: Fully-composted, stable, and weed-free organic matter, pH range of 5.5 to 8;
moisture content 35 to 55 percent by weight; 100 percent passing through 1/2-inch (13-mm)
EXTERIOR PLANTS 02950 - 7
sieve; soluble salt content of not exceeding a maximum of 5 mmhos/cm; not exceeding 0.5
percent inert contaminants and free of substances toxic to plantings; and as follows:
1. Organic Matter Content: 50 to 60 percent of dry weight.
2. Feedstock: Agricultural, food, or industrial residuals; biosolids; yard trimmings; or
source-separated or compostable mixed solid waste.
B. FERTILIZER
1. Fertilizer for trees, shrubs, and perennials shall be Osmocote Plus, 9 month slow release
fertilizer for northern states. Apply per manufacturer's recommendations.
2. Treble superphosphate (for perennial, ornamental grass, and annual beds only).
Commercially available brand. Submit proposed formulation and company name.
2.3 PLANTING SOILS
A. Planting Soil: Existing, in-place surface soil. Verify suitability of existing surface soil to
produce viable planting soil. Remove stones, roots, plants, sod, clods, clay lumps, pockets of
coarse sand, concrete slurry, concrete layers or chunks, cement, plaster, building debris, and
other extraneous materials harmful to plant growth. Stockpile material on-site for future use in
appropriate quantity. Mix surface soil with soil amendments and fertilizers as specified below.
1. Ratio of Loose Compost to Surface Soil by Volume: Mix two parts on site soil with one
part compost to be used as backfill for planting pits.
2.4 MULCHES
A. Organic Mulch: Free from deleterious materials and used as a top dressing of trees, shrubs and
ornamental grasses, consisting of one of the following:
1. Type: Ground or shredded bark.
2. Size Range: 3 inches (76 mm) maximum, 1/2 inch (13 mm) minimum.
3. Color: Dark Brown
B. In-organic (rock) Mulch: Hard, durable stone, washed free of loam, sand, clay, and other
foreign substances, of following type, size range, and color:
1. Type 1: 1.5” - 2” Poudre River Rock or approved equal
a. Size Range: 1.5”-2”
b. Color: Uniform tan-beige color range acceptable to Owners Representative
c. Depth: 3” minimum
d. Source: Timberrock Landscape Center (970) 686-0442 or approved equal.
2. Type 2: 6” – 9” Rose Rip Rap
a. Size Range: 6” – 9”
b. Color: Rose
EXTERIOR PLANTS 02950 - 8
c. Depth: 6” minimum
d. Source: Timberrock Landscape Center (970) 686-0442 or approved equal.
2.5 WEED-CONTROL BARRIERS
A. Mirafi 140, Typar 3341, or Polyspun 300 or approved equivalent.
B. Weed barriers shall be provided beneath in-organic (rock) mulch areas only, to include cobble
swale and planting areas adjacent building perimeter.
2.6 TREE STABILIZATION MATERIALS
A. Stakes and Guys:
1. Upright and Guy Stakes: Green 6-foot steel tee posts with blade with permanent plastic
or rubber/urethane protective cap.
2. Guys and Tie Wires: ASTM A 641/A 641M, Class 1, galvanized-steel wire, two-strand,
twisted, 0.106 inch (2.7 mm) in diameter.
3. Tree-Tie Webbing: 2-inch wide (minimum) UV-resistant nylon/cotton blend webbing
with heat sealed ends, tensile strength of 1000 pounds minimum, and brass grommets.
4. Guy Cables: 12-guage minimum galvanized steel with PVC sleeve completely covering
area between guy stake and tree-tie webbing.
5. Flags: Standard surveyor's plastic flagging tape, white, minimum 6 inches (150 mm)
long.
2.7 LANDSCAPE EDGINGS
A. Steel Header: Standard commercial-steel header, rolled edge, fabricated in sections of standard
lengths, with loops stamped from or welded to face of sections to receive stakes.
1. Manufacturers: Subject to compliance with requirements, available manufacturers
offering products that may be incorporated into the Work include, but are not limited to,
the following:
a. Ryerson Steel.
b. Approved substitute.
2. Header Size: minimum of 1/8 inch wide by 4” inches deep (must be rolled top or
equivalent).
3. Stakes: Tapered steel, a minimum of twelve inches (12”).
4. Accessories: Standard tapered ends, corners and splicers.
5. Finish: Standard green paint.
EXTERIOR PLANTS 02950 - 9
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 foreign or deleterious material or liquid such as paint, paint washout,
concrete slurry, concrete layers or chunks, cement, plaster, oils, gasoline, diesel fuel,
paint thinner, turpentine, tar, roofing compound, or acid has been deposited in soil within
a planting area.
2. Do not mix or place soils and soil amendments in frozen, wet, or muddy conditions.
3. Suspend soil spreading, grading, and tilling operations during periods of excessive soil
moisture until the moisture content reaches acceptable levels to attain the required results.
4. Uniformly moisten excessively dry soil that is not workable and which is too dusty.
B. Proceed with installation only after unsatisfactory conditions have been corrected.
C. If contamination by foreign or deleterious material or liquid is present in soil within a planting
area, remove the soil and contamination as directed by Architect and replace with new planting
soil.
3.2 PREPARATION
A. Protect structures, utilities, sidewalks, pavements, and other facilities and turf areas and existing
plants from damage caused by planting operations.
B. Install erosion-control measures to prevent erosion or displacement of soils and discharge of
soil-bearing water runoff or airborne dust to adjacent properties and walkways.
C. Lay out individual tree and shrub locations and areas for multiple plantings. Stake locations,
outline areas, adjust locations when requested, and obtain the City’s acceptance of layout before
excavating or planting. Make minor adjustments as required.
D. Wrap trees and shrubs with burlap fabric over trunks, branches, stems, twigs, and foliage to
protect from wind and other damage during digging, handling, and transportation.
3.3 PLANTING BED ESTABLISHMENT
A. Loosen subgrade of planting areas to a minimum depth of 12 inches (300 mm). Remove stones
larger than 1 inch (25 mm) in any dimension and sticks, roots, rubbish, and other extraneous
matter and legally dispose of them off Owner's property.
1. Thoroughly blend planting soil off-site before applying.
2. Spread topsoil as shown on drawings to required depth not less than required to meet
finish grades after natural settlement. Do not spread if subgrade is frozen, muddy, or
excessively wet.
EXTERIOR PLANTS 02950 - 10
B. Finish Grading: Grade planting areas to a smooth, uniform surface plane with loose, uniformly
fine texture. Roll and rake, remove ridges, and fill depressions to meet finish grades.
C. Before planting, obtain Architect's acceptance of finish grading; restore planting areas if eroded
or otherwise disturbed after finish grading.
3.4 EXCAVATION FOR TREES AND SHRUBS
A. Planting Pits and Trenches: Excavate circular planting pits with sides sloping inward at a 45-
degree angle. Excavations with vertical sides are not acceptable. Trim perimeter of bottom
leaving center area of bottom raised slightly to support root ball and assist in drainage away
from center. Do not further disturb base. Ensure that root ball will sit on undisturbed base soil
to prevent settling. Scarify sides of planting pit smeared or smoothed during excavation.
1. Excavate approximately three times as wide as ball diameter for balled and burlapped and
container-grown stock.
2. Excavate at least 12 inches (300 mm) wider than root spread and deep enough to
accommodate vertical roots for bare-root stock.
3. Do not excavate deeper than depth of the root ball, measured from the root flare to the
bottom of the root ball.
4. If area under the plant was initially dug too deep, add soil to raise it to the correct level
and thoroughly tamp the added soil to prevent settling.
5. Maintain required angles of repose of adjacent materials as shown on the Drawings. Do
not excavate subgrades of adjacent paving, structures, hardscapes, or other new or
existing improvements.
6. Maintain supervision of excavations during working hours.
7. Keep excavations covered or otherwise protected overnight, after working hours or when
unattended by Installer's personnel.
B. Subsoil and topsoil removed from excavations may be used as planting soil as part of the
backfill mixture.
C. Obstructions: Notify the City’s Project Manager if unexpected rock or obstructions detrimental
to trees or shrubs are encountered in excavations.
1. Hardpan Layer: Drill 6-inch- (150-mm-) diameter holes, 24 inches (600 mm) apart, into
free-draining strata or to a depth of 10 feet (3 m), whichever is less, and backfill with
free-draining material.
D. Drainage: Notify Architect if subsoil conditions evidence unexpected water seepage or
retention in tree or shrub planting pits.
E. Fill excavations with water and allow to percolate away before positioning trees and shrubs.
3.5 TREE AND SHRUB PLANTING
A. Before planting, verify that root flare is visible at top of root ball according to ANSI Z60.1. If
root flare is not visible, remove soil in a level manner from the root ball to where the top-most
EXTERIOR PLANTS 02950 - 11
root emerges from the trunk. After soil removal to expose the root flare, verify that root ball
still meets size requirements.
B. Remove stem girdling roots and kinked roots. Remove injured roots by cutting cleanly; do not
break.
C. Set balled and burlapped stock plumb and in center of planting pit or trench with original root
flare 2 inches (50 mm) above adjacent finish grades.
1. Use planting soil for portion of backfill mixture.
2. After placing some backfill around root ball to stabilize plant, all materials shall be
carefully and completely removed from the ball and trunk, including but not limited to
plastic, metal, wire, wood, cardboard, paper, fiber, burlap, and twine. Remove pallets, if
any, before setting. Do not use planting stock if root ball is cracked or broken before or
during planting operation.
3. Backfill around root ball in layers, tamping to settle soil and eliminate voids and air
pockets. When planting pit is approximately one-half filled, water thoroughly before
placing remainder of backfill. Repeat watering until no more water is absorbed.
4. All plants shall be placed and kept plumb and straight as the pit is filled with backfill.
Any plant that is not plumb prior to final acceptance shall be rejected.
5. Continue backfilling process. Water again after placing and tamping final layer of soil.
D. When planting on slopes, set the plant so the root flare on the uphill side is flush with the
surrounding soil on the slope; the edge of the root ball on the downhill side will be above the
surrounding soil. Apply enough soil to cover the downhill side of the root ball.
3.6 TREE STABILIZATION
A. Install trunk stabilization as follows unless otherwise indicated:
1. Upright Staking and Tying: For all trees, the contractor shall drive a minimum of three
stakes at least 18 inches (450 mm) below bottom of backfilled excavation and to extend
to the location of branching shown on Drawings above grade. Set vertical stakes and
space to avoid penetrating root balls or root masses.
2. The contractor shall run a double strand of wire through one grommet in the strap, wrap
the strap around trunk at no more than one-third the height of tree, and run wire through
other grommet and back to stake. Strap and wire attachment between the stake and tree
shall be adjusted so that straps are under just enough tension to avoid visible sag in lines.
Rigid guying shall not be accepted. Straps and wires shall be placed so as to be
perpendicular to the trunk. Stakes shall be parallel or slightly angled away from the
trunk.
3. Orient stakes located along walkways so that guying wire is parallel to the direction of
travel.
a. Attach flags to each guy wire, 30 inches above finish grade.
EXTERIOR PLANTS 02950 - 12
3.7 GROUND COVER AND PLANT PLANTING
A. Set out and space ground cover and plants other than trees, shrubs, and vines as indicated in
even rows with triangular spacing.
B. Use planting soil for backfill.
C. Dig holes large enough to allow spreading of roots.
D. For rooted cutting plants supplied in flats, plant each in a manner that will minimally disturb the
root system but to a depth not less than two nodes.
E. Work soil around roots to eliminate air pockets and leave a slight saucer indentation around
plants to hold water.
F. Water thoroughly after planting, taking care not to cover plant crowns with wet soil.
G. Protect plants from hot sun and wind; remove protection if plants show evidence of recovery
from transplanting shock.
3.8 PLANTING AREA MULCHING
A. Mulch backfilled surfaces of planting areas with shredded wood mulch and other areas
indicated.
1. Trees and Tree-like Shrubs in Turf Areas: Apply organic mulch ring of 3-4 inch (after
settlement) average thickness, with 36-inch radius around trunks or stems. Do not place
mulch within 4 inches of trunks or stems.
2. Organic Mulch in Planting Areas: Apply 3-4 inch (after settlement) average thickness of
organic mulch at the base of plants per the planting details, and finish level with adjacent
finish grades. Do not place mulch within 3 inches (75 mm) of trunks or stems.
3. Mineral Mulch in Planting Areas: Apply 3-inch average thickness of mineral mulch over
whole surface of planting area, and finish level with adjacent finish grades. Do not place
mulch within 3 inches (75 mm) of trunks or stems.
3.9 PLANT MAINTENANCE
A. Maintain plantings by, cultivating, watering, weeding, mulching, restoring planting saucers,
adjusting and repairing tree-stabilization devices, resetting to proper grades or vertical position,
and performing other operations as required to establish healthy, viable plantings.
B. Fill in as necessary soil subsidence that may occur because of settling or other processes.
Replace mulch materials damaged or lost in areas of subsidence.
C. The Contractor shall remove all stakes and guy wires no more than one (1) year from the date of
tree installation.
EXTERIOR PLANTS 02950 - 13
3.10 CLEANUP AND PROTECTION
A. During planting, keep adjacent paving and construction clean and work area in an orderly
condition.
B. Protect plants from damage due to landscape operations and operations of other contractors and
trades. Maintain protection during installation and maintenance periods. Treat, repair, or
replace damaged plantings.
C. Immediately after installation remove nursery tags, nursery stakes, tie tape, labels, wire, burlap,
and other debris from plant material, planting areas, and Project site.
3.11 DISPOSAL
A. Remove surplus soil and waste material including excess subsoil, unsuitable soil, trash, and
debris and legally dispose of them off the City’s property.
END OF SECTION 02950
EXHIBIT 3