20-Sec 01 56 39 - LANDSCAPE PROTECTION.pdf

LANDSCAPE PROTECTION

01 56 39-1

SECTION 01 56 39

PART 1 - GENERAL

1.01 SECTION DESCRIPTION

A. The Work of this Section Includes:

1. Provisions for landscape protection including the location and erection of protective fencing as may be appropriate for specific plant materials so as to insure their survival during and after completion of construction.

1.02 RELATED SECTIONS

A. Related Work Specified Elsewhere:

1. Section 01 57 13: Soil Erosion and Sediment Control

2. Section 31 11 00: Clearing and Grubbing

3. Section 31 23 33: Excavation, Backfill and Compaction

4. Section 32 93 00: Landscaping

1.03 QUALITY ASSURANCE

A. Reference Standards

1. Pennsylvania Dept. of Transportation Publication 408 Specifications.

1.04 JOB CONDITIONS

A. Contractor is responsible for determining through site inspection and assessment of construction requirements what protection standards are necessary and practical based on plant type and location.

B. Engineer will arrange for a site inspection with Contractor prior to initiation of construction to review specific landscape protection concerns.

PART 2 - PRODUCTS

2.01 FABRICATED PRODUCTS

A. Temporary Fencing:

1. Undamaged, standard picket snow fence, 4' high, formed of wooden slats, tightly woven with wire cable; orange, open mesh construction fencing; or other acceptable, highly visible, weather resistant, easily maintained fencing that provides a substantial barrier.

2. High carbon channel bar steel posts, 7 feet in length. Designed to drive satisfactorily into the ground and with at least ten fence holding lugs of the rivet type. Alternate post types may be approved by Engineer.

01 56 39-2

PART 3 - EXECUTION

3.01 PREPARATION

A. Prior to initiating construction, Contractor shall assess the site area and determine the protection standards required in addition to any specifically noted on the Drawings. Unusual circumstances or exceptions to the standards specified shall be resolved by agreement with Engineer.

3.02 GENERAL REQUIREMENTS

A. Grade changes and excavation shall not encroach upon a protection area.

B. No toxic materials shall be stored within 100 feet of a protection area including petroleum based and/or derived products.

C. The area within a protection area shall not be built upon, nor shall any materials be stored there either temporarily or permanently. Vehicles and equipment shall not be parked in a protection area.

D. When tree stumps are located within ten feet of a protection area the stumps shall be removed by means of a stump grinder to minimize the effect on surrounding root systems.

E. Tree roots which must be severed shall be cut by a backhoe or similar equipment aligned radially to the tree to reduce the lateral movement of the roots during excavation, which could damage the intertwined roots of adjacent trees. Within four (4) hours of any severance of roots, all tree roots that have been exposed and/or damaged shall be trimmed cleanly and covered temporarily with moist peat moss, moist burlap or other moist biodegradable material to keep them from drying out until permanent cover can be installed.

F. Sediment, retention and detention basins shall not be located within the protection area or discharge into the protection area.

3.03 ERECTION OF TEMPORARY FENCING

A. Prior to start of construction or earthmoving, a snow fence or approved alternate shall be placed around plant material specified to remain at a distance of 15' from the trunk of the plant material or the distance from the trunk to the dripline whichever is greater. For a group of trees or woodlands, the fence location shall be determined by the aggregate distance or driplines for the individual plant. Exceptions to this requirement must be approved by Engineer.

B. Temporary fencing shall be periodically inspected and repairs accomplished to insure continued integrity during the construction period.

C. Temporary fencing shall remain in place until final restoration of the site is to occur.

3.04 RETAINING WALLS

A. When the original grade cannot be maintained at the edge of the protection area, a retaining wall shall be constructed outside of the protection area.

1. The retaining wall shall be designed to comply with acceptable standards for retaining walls and shall be approved by Engineer prior to construction.

01 56 39-3

2. The following features shall be employed to ensure survival of the landscape materials within the protection area.

(a) The top of the retaining wall shall be four inches above the finished grade line.

(b) The retaining wall shall be constructed of large stones, brick building tile, concrete blocks, treated woodbeams or wire gabions not less than six inches by six inches.

(c) Means for drainage through the retaining wall shall be provided so water will not accumulate on either side of the wall; weep holes shall be required with any wall.

(d) Any severed roots as a result of excavation shall be trimmed so that their edges are smooth and cut back to a lateral root if exposed.

3.05 PRUNING

A. All final cuts shall be made sufficiently close to the trunk or parent limb but without cutting into the branch collar or leaving a protruding stub, according to National Arborist Association Standards. All necessary pruning cuts must be made to prevent bark from being torn from the tree and to facilitate rapid healing. Flush cuts are unacceptable.

3.06 FERTILIZATION

A. All trees which have experienced any disturbance or have had damage to the roots or branches shall be fertilized.

B. Trees shall be fertilized in early fall (September- October) or mid-spring (April-May). Fall applications are preferred.

C. Fertilizer grade shall have approximately 3 parts nitrogen to 1 part phosphorus and potassium (3-1-1 ratio).

D. Fertilizer shall be broadcast over the soil surface in an area twice the size of the protection zone at a rate of 1 pound nitrogen per 1000 square feet. A minimum of 1000 square feet per tree shall receive fertilization.

3.07 TRENCHING AND TUNNELING

A. If there is no alternative but to locate a utility line through a protection area, tunneling shall be used instead of trenching, except where in the opinion of Engineer survival of the tree(s) would not be affected by either method. Engineer shall determine the most desirable location for the utility line.

B. Trenches shall be filled as soon as possible, and tamped to avoid air spaces.

END OF SECTION