SECTION 010000 - DP&R SPEC TEMPLATE - Denver



SECTION 32 96 43 TREE TRANSPLANTING

GENERAL

1. RELATED DOCUMENTS

A. Contract Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

B. Related Report Documentation

***Edit list of applicable documents***

1.

2. City and County of Denver - Regulated Asbestos Contaminated Soil Standard Operating Procedure (RACS SOP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, May 2, 2019 (see Appendix).

3. [City and County of Denver – Standard Materials Management Plan (MMP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, November 13, 2019 (see Appendix).]

4. City and County of Denver – Guidance for Reuse of Soil on City Projects, Denver Department of Environmental Health – Environmental Quality Division, October 5, 2017 (see Appendix).

2. SUMMARY

A. This Section includes requirements for furnishing all labor, equipment, and materials required to transplant trees from the site to new locations on the site, and restore tree excavation area as directed by the Project Manager.

***Edit list of applicable documents***

B.

1. Division 01 Section “Tree Retention and Protection”.

2. Division 31 Section “Earth Moving”.

3. Division 31 Section “Watering”.

4. Division 32 Section “Soil Preparation”.

5. Division 32 Section “Irrigation Systems”.

6. Division 32 Section “Topsoil”.

7. Division 32 Section “Turfgrass Seeding”.

8. Division 32 Section “Native Seeding”.

9. Division 32 Section “Sodding”.

10. Division 32 Section “Landscape Management and Maintenance”.

3. DEFINITIONS

A. General: See definitions in ANSI A300 (Part 6) and in ANSI Z60.1 pertaining to field-grown trees, except as otherwise defined in this Section.

B. Caliper: Caliper of a trunk as measured by a diameter tape at a height six-inches (6”) above the root flare for trees up to, and including, four-inch (4”) size at this height; and as measured at a height of twelve-inches (12”) above the root flare for trees larger than four-inch (4”) size.

***Retain PARAGRAPH BELOW, Caliper (DBH)" ONLY if LARGER TREES ARE PRESENT ON THE PROJECT***

C.

D. Root-Ball Depth: Measured from bottom of trunk flare to the bottom of root ball.

E. Root-Ball Width: Measured horizontally across the root ball with an approximately circular form or the least dimension for non-round root balls, centered around the trunk within a 10% Root tolerance according to ANSI Z60.1.

F. Root Flare: Also called “trunk flare”. The area at the base of the tree's stem or trunk where the stem or trunk broadens to form roots; the area of transition between the root system and the stem or trunk.

4. SUBMITTALS

A. Product Data: For each type of product.

B. Samples for Verification: For each of the following:

1. Proprietary Root-Ball-Stabilization Device: One unit.

2. Slow-Release Watering Device: One unit of each size required.

C. Pruning Schedule: Written schedule prepared by a certified arborist detailing scope and extent of pruning each tree in preparation for and subsequent to transplanting.

***EDIT FOLLOWING LIST AS NECESSARY TO REFLECT PROJECT CONDITIONS***

1.

2. Location on site plan. Include City site identification number for each.

3. Reason for pruning.

4. Preparatory Pruning: Time schedule and description of preparatory pruning to be performed.

a. Indicate time in months preceding the extraction of the tree.

b. Indicate diameter of root ball and depth of root pruning for each tree.

5. Description of root and crown pruning during and subsequent to transplanting.

6. Description of maintenance following pruning.

D. Qualification Data: For qualified tree-service firm and arborist.

E. Certification: From qualified arborist, certifying that transplanted trees have been protected during construction and that trees were promptly and properly treated. Maintenance Recommendations: From arborist, recommended procedures to be established by Owner for care and protection of trees after completing the Work.

1. Submit before completing the Work.

F. Existing Conditions: Documentation of existing trees indicated to be transplanted, which establishes preconstruction conditions that might be misconstrued as damage caused by construction activities.

1. Use sufficiently detailed color photographs or video recordings. Color shall accurately depict hue condition of foliage and bark.

2. Include drawings and notations to indicate specific wounds and damage conditions of each tree designated to be transplanted.

G. Tree-Transplanting Program: Submit before work begins.

H. Sample Warranties: For special warranties. See below for requirements.

I. Tree-maintenance reports. See below for requirements.

1.5 QUALITY CONTROL

A. Preinstallation Conference: Conduct conference at project site.

1. Review methods and procedures related to transplanting work include, but are not limited to, the following:

a. Construction schedule. Verify availability of materials, personnel, equipment, and unimpeded access needed to make progress and avoid delays.

b. Tree and plant protection.

c. Tree maintenance.

d. Arborist's responsibilities.

e. .

J. Tree-Service Firm Qualifications: An experienced landscaping contractor or tree-moving firm that has successfully completed transplanting work similar to that required for this Project and that will assign an experienced, qualified arborist to Project site during execution of the Work.

1. Arborist Qualifications: Arborist with at least 10 years of experience in the Colorado Front Range region, currently certified by the International Society of Arboriculture (ISA).

K. Tree-Transplanting Program: Prepare a written plan by a Certified Arborist for transplanting trees for the whole Project, including each phase or process, tree maintenance, and protection of surrounding area and materials during operations. Describe in detail the materials, methods, and equipment to be used for each phase of the transplanting work.

1. Include transplanting times appropriate for each species at the Project location unless otherwise indicated on Contract Drawings or directed by the Project Manager or the Office of the City Forester.

2. Include a transplanting schedule for each species to be transplanted, coordinated with the Project schedule.

3. Include site plans clearly marked to show tree-moving routes from extraction to planting locations. Indicate proposed equipment, weight, and turning radii.

4. Show details of temporary protective barriers where needed.

5. Include diagrams showing clearances to utility lines and other encumbrances along route.

6. Include care and maintenance provisions, and eventual removal of tree stabilization.

L. Pruning work must be determined and completed by a licensed arborist according to standards established by the American National Standards Institute: ANSI A300, part 1.

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.

M. Bulk Materials:

1. Do not dump or store bulk materials near structures, utilities, walkways and pavements, or on existing turf areas or trees.

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 with appropriate certificates.

N. Protect bark, branches, and root systems from sun scald, drying, wind burn, sweating, whipping, and other handling and tying damage. Do not bend or bind-tie trees in such a manner as to destroy their natural shape or cause damage.

O. Completely cover canopy when transporting trees.

P. Handle trees by root ball not by trunk. Do not drop trees.

Q. Move trees after preparations for planting have been completed, and install immediately. If planting is delayed more than six hours after moving, set trees in their appropriate aspect (sun, filtered sun, or shade), protect from weather and mechanical damage, and keep roots moist.

1.7 SITE CONDITIONS

A. Transplanting operations shall be conducted under favorable weather conditions and during the tree’s dormant period (November 1 to March 31), unless otherwise approved by the Office of the City Forester and the Project Manager.

R. Weather Limitations: Proceed with transplanting only when existing and forecasted weather conditions permit planting to be performed when beneficial and optimum results may be obtained. Do not transplant during excessively wet or frozen conditions, or overly hot, dry and/or windy conditions. Apply products during favorable weather conditions according to manufacturer's written instructions and warranty requirements.

S. At least seventy-two (72) hours prior to beginning transplanting work, the Contractor shall contact UNCC at 811 for location of respective underground utilities and Project Manager for location of irrigation system. No transplanting shall occur until all utilities have been located.

1.8 DAMAGE TO SITE CONDITIONS

A. Damage to lawns, natural areas, pavements, irrigation systems, underground utilities and other improvements shall be repaired by the Contractor at no additional cost to the City.

1. Coordination with Turf Areas (Lawns): Perform transplanting before planting turf areas unless otherwise indicated or otherwise approved by Project Manager.

2. Coordination with Planting Beds: Perform transplanting before planting bedded areas unless otherwise indicated.

1.9 WARRANTY

***EDIT FOLLOWING LIST AS NECESSARY TO REFLECT PROJECT CONDITIONS***

A.

3. Failures include, but are not limited to, the following:

a. Death and unsatisfactory growth except for defects resulting from vandalism lack of adequate maintenance, neglect by City staff, or incidents that are beyond the Contractor's control.

1) Death and unsatisfactory growth is defined as more than twenty-five percent (25%) dead, dead or declining central leader, or in an unhealthy condition or failure to meet general performance requirements at end of the Warranty Period.

b. Structural failures including tree(s) falling or blowing over, split branches or snapped tops.

c. Faulty performance of materials and devices related to tree plantings including tree stabilization and watering equipment.

4. Warranty Period from Date of Substantial Completion:

***EDIT FOLLOWING LIST AS NECESSARY TO REFLECT PROJECT CONDITIONS. MAY REQUIRE A LIST OF TREE SIZES IF A SIGNIFICANT NUMBER OF TREES OF VARYING SIZES WILL BE TRANSPLANTED.***

a.

5. Include the following remedial actions as a minimum

a. Remove dead trees and trees with unsatisfactory growth at end of warranty period; replace when directed.

b. A limit of one replacement of each tree will be required except for losses or replacements due to failure to comply with requirements.

1) The monetary value of a transplanted tree which needs to be replaced following transplanting, as determined by the Project Manager, due to damage and/or die-back will be determined using Guide for Plant Appraisals, by the Council of Tree and Landscape Appraisers (CLTA), latest edition. Contractor will be responsible for the monetary reimbursement to the City for this amount.

c. Replace materials and devices related to tree plantings.

d. Provide extended warranty for period equal to original warranty period, for replaced trees.

PRODUCTS

1. TREES TO BE TRANSPLANTED

A. Trees to be transplanted shall be indicated on the Contract Drawings and as directed by the Office of the City Forester and the Project Manager.

2. WATER

A. Water shall be potable and supplied by Contractor at planting time and as necessary until irrigation system is operational. Water shall contain no substances harmful to plant life.

3. PLANTING MATERIALS

A. Backfill Soil: Excavated soil mixed with planting soil conditioner of suitable moisture content and granular texture for placing and compacting in planting pit around tree, and free of 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.

1. Mixture: Well-blended mix of two parts excavated soil to one-part soil conditioner.

2. Soil Conditioner: Well-composted material as specified in Section 329113 "Soil Preparation”.

4. TREE-STABILIZATION MATERIALS

***coordinate following materials with drawing and details***

A.

1. Upright and Guy Stakes: Rough-sawn, sound, new softwood with specified wood preservative treatment by pressure process, free of knots, holes, cross grain, and other defects, 2-inch (2”) diameter by length indicated, pointed at one end.

2. Wood Deadmen: Timbers measuring eight inches (8”) in diameter and forty-eight inches (48”) long, treated with specified wood preservative treatment by pressure process.

3. Guys and Tie Wires: ASTM A 641/A 641M, Class 1, #14 galvanized-steel wire, two-strand, twisted.

4. Guy Springs: Submit manufacturer’s product information for approval.

5. Tree-Tie Webbing: UV-resistant nylon webbing with brass grommets, size as indicated.

6. Flags: One-half-inch (1/2”) diameter PVC pipe, length as indicated.

5. MISCELLANEOUS PRODUCTS

A. Organic mulch, free from disease pathogens, weeds, chemicals, and other deleterious materials and suitable as a top dressing of trees and shrubs, consisting of chipped bark and/or wood material not larger than four-inches (4”) in length and half inch (1/2”) in width. Submit 1.0 cubic foot sample for approval. Mulch is to be weed-free.

B. Antidesiccant: Water-insoluble emulsion, permeable moisture retarder, film forming, for trees. Deliver in original, sealed, and fully labeled containers and mix according to manufacturer's written instructions.

C. Burlap: Non-synthetic, biodegradable.

EXECUTION

1. GENERAL

A. Proposed locations for trees to be transplanted shall be staked and approved by the Office of the City Forester and the Project Manager prior to beginning planting operations. New locations shall be on site as shown on Contract Drawings, or as directed by Project Manager.

B. Prior to transplanting any trees, the Office of the City Forester shall determine if the tree is suitable for transplanting.

2. EXAMINATION

A. Examine areas where the Work of this Section will be performed for compliance with requirements and conditions affecting installation and performance.

1. Verify that no foreign or deleterious material or liquid such as, but not limited to, 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 the work area.

2. Verify that final grades are completed in accordance with the drawings.

B. Erosion and Sedimentation Control: Examine the site to verify that temporary erosion- and sedimentation-control measures are in place. Verify that flows of water redirected from construction areas or generated by construction activity do not enter or cross transplanting areas.

C. For the record, prepare written report, endorsed by the arborist, listing conditions detrimental to transplanting work and tree protection and health.

D. Proceed with transplanting only after unsatisfactory conditions have been corrected and approval to proceed given by Project Manager.

3. PREPARATION

A. Protect structures, utilities, sidewalks, pavements, other facilities, turf areas, and other plants and planting areas from damage caused by transplanting operations. Repair damage to site elements noted above that result from construction activities at no additional cost to City.

B. Utility Locator Service: Notify utility locator service before beginning excavation. All utilities are to be marked and a hard-copy diagram of utility locations from the utilities locator service given to Project Manager prior to excavation.

C. Locate and clearly identify trees for transplanting.

D. Lay out individual transplant locations and areas for multiple plantings. Stake locations, outline areas, adjust locations when requested, and obtain Project Manager’s acceptance of layout before transplanting. Make minor adjustments as required.

E. Dig pits immediately prior to moving plants to their respective locations for planting to ensure that they will not be unnecessarily exposed to drying elements or to physical damage.

1. Circular pits with vertical sides hard-trimmed shall be excavated with tree spade to a depth such that tree, when planted, will sit two-inches (2”) to three-inches (3”) above surrounding grade.

2. Sides of pit shall be scarified or roughened by hand to eliminate glazing.

3. The planting pit shall be prepared per ANSI A300 part 64.4.4.

F. It is not anticipated that planting shall be done where the depth of soil over rock or other underground obstructions is insufficient to accommodate the roots or where pockets in rock or impervious soil will require drainage. If such conditions are encountered in the excavation of planting areas, and if the stone, boulders or other underground obstructions cannot be broken and removed by hand methods in the course of digging plant pits of the usual size, other locations for the planting may be designated by Project Manager. Removal of rock or other underground obstructions and relocation of plant materials shall be done only as directed by the Project Manager. If changes in the location of the work or if the removal of rock or other obstructions, other than existing underground utilities, involves additional work, the Contractor shall notify Denver Forestry and Project Manager for approval of extra payment.

G. Seepage: Notify Project Manager if subsoil conditions evidence unexpected water seepage into tree-planting pits.

H. Drainage: Fill planting pit half full of water and time the infiltration rate of the soil. If the drainage rate is less than 1-inch per hour, notify Project Manager to determine need for subsurface drainage.

I. The Contractor shall dispose of excess excavated planting pit material by filling and compacting the holes created by moving the trees.

4. SIZE OF TREE SPADE

A. The size of the mechanical tree spade to be used for transplanting shall be reviewed and approved by the Office of the City Forester and Project Manager. A tree spade shall be 10-inches (10”) (minimum) in size for every 1-inch of tree caliper. Minimum size spade shall be 48-inches (48”).

5. TRANSPLANTING TREES

A. General: Coordinate the transplanting of trees with the Office of the City Forester and the Project Manager. The Office of the City Forester or the Project Consulting Arborist shall be present to supervise.

B. Orientation Marking: Mark the north side of each tree with non-permanent paint before extracting.

C. Out-of-Season Planting: If planting before or after the in-season period for tree, provide a minimum root-ball diameter of twenty-inches (20”) for each-inch of tree caliper being transplanted.

D. Root-Ball Depth: As determined by the arborist for each species and size of tree and for site conditions at original and planting locations.

E. Extracting with Tree Spade: Obtain Project Manager’s approval to use tree spade for tree transplanting.

1. Use the same tree spade to extract the tree as will be used to transport and plant the tree

2. Do not use tree spade to move trees larger than the manufacturer's maximum size recommendation for the tree spade being used.

3. When extracting the tree, center the trunk within the tree spade and move tree with a solid ball of earth.

6. SETTING TREES

A. Planting Standard: Perform planting according to ANSI A300 (Part 6) unless otherwise indicated.

B. Relocate trees to be transplanted within one working day to locations approved by the Office of the City Forester and the Project Manager.

C. Before planting, verify that root flare is visible at top of root ball. If root flare is not visible, carefully remove soil in a level manner from the root ball to where the top-most root emerges from the trunk. After soil removal to expose the root flare, verify that root ball still meets size requirements and planting hole depth is appropriate.

D. Ensure that root flare is visible after planting.

E. Orientation: Position the tree so that its north side, marked before extracting, is facing north in its new location.

F. Trees shall be planted in pits to such a depth that the root flare at the plant after settlement will be two-inches (2”) above that at which the plant is currently growing. Trees shall be planted upright with trunks plumb and faced areas as described in the “Orientation” article above.

G. Till a two foot (2’) radius to a depth of 6” outside of root ball or as directed by the Office of the City Forester after transplanting to have loosened soil for new roots to establish.

H. A saucer shall be formed extending twenty-four inches (24”) beyond edge of individual planting pit to cover tilled area.

I. Slopes: When planting on slopes, set the tree 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.

J. Trees shall be thoroughly watered immediately after planting.

7. TREE STABILIZATION

A. Trunk Stabilization by Staking and Guying: Install trunk stabilization as follows unless otherwise indicated on Contract Drawings or directed by the Office of the City Forester and the Project Manager.

1. Site-Fabricated Staking Method: Stake transplanted trees sized up to four-inch (4”) caliper. Install number of stakes as indicated.

a. Retain options for compression springs in subparagraphs below to provide more line flexibility than turnbuckles.

b. Drive stakes into undisturbed grade outside tree pit soil transition zone as indicated. Avoid penetrating root balls or root masses.

c. Securely attach specified wire to stakes.

d. Support trees with specified wire and tree tie webbing from the tree trunk to each stake. Allow one to two inches (1” to 2”) of slack to avoid rigid restraint of the tree.

e. Attach thirty-six (36”) long by one-half-inch (1/2”) diameter PVC pipe flagging to each wire.

2. Site-Fabricated Guying Method: Guy transplanted trees greater than four-inch (4”) caliper. Install no fewer than three (3) guys spaced equally around tree.

a. For trees over four-inches (4”) to six-inches (6”) caliper, securely attach guys to specified anchor thirty-inches (30”) long, driven in to undisturbed soil outside tree pit as indicated. Avoid penetrating root balls or root masses.

b. Install one (1) compression spring approved by Project Manager in each guy assembly.

c. For trees larger than six-inches (6”) in caliper, anchor guys to wood deadmen buried at least thirty-six (36”)-inches below grade.

d. Support trees with specified wire and tree tie webbing at contact points with tree trunk and reaching to specified anchor. Allow enough slack to avoid rigid restraint of tree.

e. Attach thirty-six (36”) long x one-half-inch (1/2”) diameter PVC pipe flagging to each wire.

8. MULCHING

A. Organic Mulch: Apply three-inch (3”) average thickness of organic mulch extending twenty-four inches (24”) beyond edge of individual planting pit to cover tilled area, and finish level with adjacent finish grades. Do not place mulch within three-inches (3”) of trunks or stems.

9. MAINTENANCE OF TRANSPLANTED TREES

A. Transplanted trees shall be protected and maintained by the Contractor until Substantial Completion, after which the City will assume responsibility for the maintenance.

B. Maintenance shall include watering, weeding, cultivating, mulching, removal of dead branches, resetting plants to proper grade or upright position and restoration of tree planting saucers and other necessary operations.

C. Apply treatments as required to keep tree materials, planted areas, and soils free of pests and pathogens or disease. Use integrated pest management practices whenever possible to minimize the use of pesticides and reduce hazards. Treatments include physical controls such as hosing off foliage, mechanical controls such as traps, and biological control agents.

1. Pesticide Application: Apply pesticides and other chemical products and biological control agents as directed and approved by the Office of the City Forester and the Project Manager. Coordinate applications with City's operations and others in proximity to the Work. Notify the Office of the City Forester and Project Manager before each application is performed.

D. Pruning work shall be completed per the Office of the City Forester and in accordance with standards established by the American National Standards Institute and the International Society of Arboriculture.

E. Reports: Have arborist prepare quarterly inspection reports and submit to Project Manager.

F. [During design, identify a specialized maintenance plan with the Office of the City Forester]

10. REPAIR AND REPLACEMENT

A. General: Repair or replace transplanted trees and other plants indicated to remain or be relocated that are damaged by construction operations, in a manner recommended by the arborist and approved by Project Manager, and with 1.10.A.3 of this Section.

1. Submit details of proposed pruning and repairs.

2. Perform repairs of damaged trunks, branches, and roots within 24 hours according to arborist's written instructions.

3. Replace trees and other plants that cannot be repaired and restored to full-growth status, as determined by Project Manager, and per 1.10.A.3 of this Section

11. CLEANUP AND PROTECTION

A. During transplanting, keep adjacent paving and construction clean and work area in an orderly condition.

B. Protect trees from damage due to transplanting operations and operations of other contractors and trades. Maintain protection during transplanting and maintenance periods. Treat, repair, or replace damaged plantings.

C. After planting and before Substantial Completion, remove tags, markings, tie tape, labels, wire, burlap, and other debris from transplanted trees, planting areas, and Project site.

12. DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Except for materials indicated to be recycled, remove surplus soil, excess excavated material, waste materials, displaced plants, trash, and debris, and legally dispose of them off City’s property.

B. Transport surplus satisfactory soil to designated storage areas on City’s property. Stockpile or spread soil as directed by the Project Manager.

1. Except for materials indicated to be retained on City’s property or recycled, remove excess excavated material, waste materials, displaced plants, trash, and debris, and legally dispose of them off City’s property.

MEASUREMENT AND PAYMENT

1. MEASUREMENT [Consultant to select A or B]

A. Measurement will be based on the percentage complete for the lump sum contract amount for Tree Transplanting.

B. Measurement will be made by the contract unit specified for Tree Transplanting.  Measurement shall include the actual number of units of specified material(s) placed and accepted at the locations shown on the Contract Drawings, or as directed by the Project Manager, and in accordance with the Specifications.

2. PAYMENT

A. Payment will be made at the [contract unit] [lump sum contract] price, and shall include required materials, transportation, equipment, labor, excavation, stockpiling, disposing, hauling off, watering, dust control, erosion and sediment control, fine grading, as required in accordance with the Contract Drawings and Specifications.

END OF SECTION 32 96 43

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