36C26118B0042-029.doc

RENOVATE CANTEEN PLAZA

DVA Project No. 640-12-124P

Palo Alto, CA VA Palo Alto Health Care System

SECTION 01 56 39

TEMPORARY TREE PROTECTION

PART 1 - GENERAL

1.1 RELATED SECTIONS

A. Demolition and removal of roads, walks, curbs, and on‑grade slabs outside buildings to be demolished: Section 31 20 00, EARTH MOVING.

B. Environmental Protection: Section 01 57 19, TEMPORARY ENVIRONMENTAL CONTROLS.

1.2 DEFINITIONS

A. Tree-Protection Zone: Area surrounding individual trees or groups of trees to be protected during construction, and defined by a circle concentric with each tree with a radius 1.5 times the diameter of the drip line unless otherwise indicated.

1.3 PROHIBITED PRACTICE

A. Practices are prohibited within protection zones:

1. Storage of construction materials, debris, or excavated material.

2. Parking vehicles or equipment.

3. Foot traffic.

4. Erection of sheds or structures.

5. Impoundment of water.

6. Excavation or digging unless otherwise indicated.

7. Attachment of signs to or wrapping materials around trees or plants unless otherwise indicated.

8. Fertilizing protected trees during first year following construction, unless otherwise instructed by arborist.

B. Do not direct vehicle or equipment exhaust toward protection zones.

C. Prohibit heat sources, flames, ignition sources and smoking within or near protection zones and organic mulch.

PART 2 - PRODUCTS

2.1 Protection-Zone Fencing

Provide adequate chain-link fencing in order to protect tree(s).

PART 3

- EXECUTION

3.1 TREE PROTECTION ZONES

A. Protection-Zone Fencing:

1. Install protection-zone fencing along edges of protection zones before materials or equipment are brought on the site and construction operations begin in a manner that will prevent people and animals from entering protected area. Construct fencing so as not to obstruct safe passage or visibility at vehicle intersections where fencing is located adjacent to pedestrian walkways or in close proximity to street intersections, drives, or other vehicular circulation.

2. Posts: Provide concrete base acceptable to the COR.

B. Protection-Zone Signage:

1. Install protection-zone signage in visibly prominent location in a manner approved by the COR.

2. Install one sign spaced approximately every 20 feet on protection-zone fencing, but no fewer than signs with each facing a different direction.

C. Maintenance of Protection Zones:

1. Maintain protection zones free of weeds and trash.

2. Maintain protection-zone fencing and signage in good conditions as acceptable to the COR and remove when construction operations are complete and equipment has been removed from site. Do not remove protection-zone fencing, even temporarily, to allow deliveries or equipment access through the protection zone.

3.2

EXCAVATION

D. Trenching near Trees:

1. Where utility trenches are required within protection zones, hand excavate under or around tree roots or tunnel under the roots by drilling, auger boring, or pipe jacking. Do not cut main lateral tree roots or taproots; cut only smaller roots that interfere with installation of utilities. Cut as required for root pruning.

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TEMPORARY TREE PROTECTION

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