02 41 00.pdf

Emsworth Back Channel Dam Abutment Stabilization EMSBCRA Right Abutment

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 41 00

DEMOLITION

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 GENERAL

1.4 SUBMITTALS

1.5 DUST CONTROL

1.6 ENVIRONMENTAL PROTECTION REQUIREMENTS

1.7 BURNING

1.8 USE OF EXPLOSIVES

1.9 DISPOSITION OF MATERIAL

1.9.1 Title to Materials

1.9.2 Material for Contractor Salvage

1.9.3 Unsalvageable Materials

1.9.4 Items for Disposal

1.9.5 Temporary Work Area Easement

1.10 CLEAN-UP

1.10.1 Debris and Rubbish

1.10.2 Debris Control

1.10.3 Wash Down

1.10.4 Regulations

1.11 PROTECTION OF EXISTING UTILITIES

1.12 TEMPORARY RELOCATIONS

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 CONCRETE REMOVAL

3.1.1 General

3.1.2 Rock Anchor Head Encasement

3.1.3 Removal of Concrete

3.1.4 Tolerances for Concrete Removal

3.1.5 Control of Concrete Debris

3.2 CHAIN LINK FENCE REMOVAL

3.3 POST AND CABLE GUARDRAIL REMOVAL

3.4 EXISTING ABUTMENT WALL LADDER, ARMOR, AND EMBEDDED FEATURE REMOVAL

3.5 DISPOSAL OF MATERIALS

3.5.1 General

3.5.2 Hauling Materials to Disposal Facilities

3.5.3 Disposal of Solid Wastes

3.6 CONTRACTOR QUALITY CONTROL

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SECTION 02 41 00

DEMOLITION

PART 1 GENERAL

1.1 SUMMARY

This section addresses the requirements for removal of existing chain link fence, post and cable guardrail along the top of the abutment wall, ladders, armor, and embedded features of the abutment wall, and concrete removal to facilitate refacing of the abutment wall and installation of the rock anchors.

1.2 REFERENCES

The publication listed below forms a part of this specification to the extent referenced. The publication is referred to in the text by the basic designation only.

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2008) Safety and Health Requirements Manual

1.3 GENERAL

All demolition and removal shall be done with care to avoid causing damage to adjacent structures, equipment, machinery, and concrete not to be disturbed otherwise under the scope of this contract. The Contractor shall prevent damage to features of work to remain in-place. All demolition operations shall be performed in accordance with the approved Demolition Work Plan.

The Contractor shall provide all necessary supports and shoring in order to fully support all areas of concrete that are to support the weight of overlying concrete not to be removed. Any damage caused by the Contractor's failure to provide satisfactory protection and/or support shall be repaired or replaced at no expense to the Government.

Reinforcement and other embedded items exposed during concrete removal operations shall, unless otherwise directed, indicated on the drawings, or specified, be cut off flush at the breakout depth or face. Metal and other miscellaneous items not indicated to be removed, which are encountered in the performance of the work under this contract shall not be removed. Any metal surfaces against which concrete is to be placed shall be wire brushed and cleaned to remove rust, grease and other materials which would prevent proper bond with the concrete.

Safety manual EM 385-1-1 shall be consulted, and applicable sections complied with, by the Contractor while performing the work specified in this section. Safe access throughout the entire project shall be continuously provided for personnel of the Emsworth Locks and Dams and those of the Contracting Officer. Access shall be provided and maintained during every phase of the demolition and construction operations. An access plan shall be coordinated with the Lockmaster and shall be provided to the Contracting Officer for approval.

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1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having an "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Demolition Work Plan; G|RE

Within 30 days following issuance of Notice to Proceed, the Contractor shall submit proposed methods and procedures for the concrete demolition work for the Government's review.

The proposed procedures shall provide for safe conduct of the work, careful removal and disposition of materials, protection of property, equipment and machinery which is to remain undisturbed, protection and support of existing features, coordination with other work in progress, and coordination with dam operating requirements.

The plan shall include a detailed description of the proposed method(s) and equipment to be used for the demolition operation, and the sequence of each operation.

No demolition work shall commence until the Contractor has received the Contracting Officer's approval of the proposed plan in writing.

Disposal Work Plan; G|RE

The procedures proposed for the collection, handling, transport and disposal of concrete debris and solid wastes shall be submitted for approval. The procedures shall provide for safe conduct of the work, careful removal and disposition of materials, protection of property, equipment and machinery which is to remain undisturbed, protection of existing features, coordination with other work in progress, and coordination with facility operating requirements.

The disposal procedures shall include a detailed description of the equipment to be used for each operation and the sequence of operations. No work shall commence until the Contractor has received the Contracting Officer's approval in writing.

The plan shall address the handling and any temporary site storage of concrete debris.

The plan shall clearly identify the means by which all materials will be disposed of in accordance with the requirements specified herein.

The plan shall ensure that all materials are handled, transported, and placed and/or disposed of properly, and shall provide the name of the permitted solid waste disposal facility.

Access Plan; G|RE

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The plan shall address the method(s) of safe access to the back channel dam for Government operating personnel.

1.5 DUST CONTROL

The amount of dust resulting from the demolition work shall be controlled to prevent the spread of dust and to avoid creation of a nuisance in the surrounding area. Use of water will not be permitted when it will result in, or create, hazardous or objectionable conditions such as ice, flooding, and/or pollution.

1.6 ENVIRONMENTAL PROTECTION REQUIREMENTS

The Contractor shall comply with all applicable Federal, State, and local laws and regulations. The Contractor shall provide environmental protective measures and procedures to prevent and control pollution, limit habitat disruption, and correct environmental damage that occurs during construction as specified in Section 01 57 20.00 10 ENVIRONMENTAL

PROTECTION.

1.7 BURNING

Burning of debris at the project site WILL NOT BE PERMITTED.

1.8 USE OF EXPLOSIVES

Use of explosives WILL NOT BE PERMITTED.

1.9 DISPOSITION OF MATERIAL

1.9.1 Title to Materials

Title to all materials and equipment to be demolished and disposed, except for those listed herein and on the contract drawings to be salvaged or reinstalled, is vested in the Contractor upon removal. However, the Government will not be responsible for the condition, loss or damage to such property, as a result of the Contractor's operations, after Notice to Proceed.

1.9.2 Material for Contractor Salvage

Material to be salvaged by the Contractor shall be stored as approved by the Contracting Officer. Salvage materials shall be removed from Government property before completion of the contract. Material for salvage shall not be sold on the site.

1.9.3 Unsalvageable Materials

Concrete, metal items, and other noncombustible materials other than that permitted to remain in place, or to be returned to the Government, shall be disposed of as specified in paragraph "Disposal of Materials". Combustible materials shall be disposed of off the site in accordance with applicable Federal, State, and local regulations.

1.9.4 Items for Disposal

The following items and equipment shall be removed from the back channel dam and disposed by the Contractor:

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a. Existing Chain Link Fence

Remove chain link fencing, gates, and other related items scheduled for removal and transport to designated areas as specified herein.

b. Existing Post and Cable Guardrail

Remove existing post and cable guardrail scheduled for removal from the top of the existing abutment wall and transport to designated areas. The Contractor shall remove the guardrail from Government property and dispose of as specified herein.

c. Ladders, Armor, and Embedded Features

Ladders, armor, and other features embedded into the existing abutment wall shall be removed and disposed of by the Contractor in accordance with this specification section. The Contractor shall remove concrete as necessary to remove the embedded items, but shall keep the removal to the limits shown on the drawings or necessary for removal.

d. Existing Bollards

Remove existing bollards scheduled for removal as shown on the drawings and transport to designated areas. The Contractor shall remove the bollards from Government property and dispose of as specified herein.

de. Miscellaneous Concrete

Concrete generated during demolition operations shall be removed as specified herein and disposed of at a properly licensed, commercially available disposal facility.

1.9.5 Temporary Work Area Easement

The Contractor shall relocate existing semi-truck trailers and remove and dispose of or relocate existing miscellaneous materials from the Temporary Work Area Easement as specified in subparagraph "Temporary Work Area Easement Relocations" of paragraph "Laydown, Storage, and Parking Areas" of Section 01 11 00 GENERAL REQUIREMENTS.

1.10 CLEAN-UP

1.10.1 Debris and Rubbish

Debris and rubbish as a result of the Contractor's demolition operations shall be removed from throughout the limits of the work.

1.10.2 Debris Control

Debris shall be removed and transported in a manner as to prevent spillage on streets or adjacent areas.

1.10.3 Wash Down

All surfaces of concrete which are stained by dirt, oil, grease, fuel, or other byproducts that are created by the construction operations shall be

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1.10.4 Regulations

Local regulations regarding hauling and disposal apply.

1.11 PROTECTION OF EXISTING UTILITIES

Responsibility for coordination, protection, and avoidance of existing utilities in conjunction with the demolition work shall be in accordance with Section 01 18 00 UTILITY COORDINATIONS.

1.12 TEMPORARY RELOCATIONS

The Contractor, with the approval of the Contracting Officer, may remove any fences, signs, posts, equipment, fixtures, piping, or other miscellaneous items on Government property which would interfere with his operations, and reinstall these items after all interfering construction is complete. The Contractor shall disassemble such items and store them for reinstallation at a later time. The items shall be stored in a safe location, and in a manner to prevent damage. Any damage to such items, as a result of the Contractor's neglect during disassembly, storage, and/or reinstallation shall be repaired to the satisfaction of the Contracting Officer at the Contractor's expense.

PART 2 PRODUCTS (Not Applicable)

PART 3 EXECUTION

3.1 CONCRETE REMOVAL

3.1.1 General

Concrete shall be removed at the locations, and to the limits, shown on the contract drawings, unless otherwise directed by the Contracting Officer.

The objective shall be to remove the areas of concrete on the existing abutment wall to facilitate refacing of the wall and rock anchor installation, and remove otherwise existing stable concrete in order to permit placement of new concrete required for the new abutment combination wall. The removal areas shall be limited to the areas shown on the drawings for removal.

All edges of concrete to be removed, except where the edge of a repair area occurs at a joint, shall be saw cut to the full depth of the removal, unless otherwise shown on the contract drawings, or specified elsewhere.

All edges of concrete removal shall be made square. Feathered edges will be prevented. Concrete shall be removed by an approved method(s) that will not injure adjacent concrete to remain in place or remove excessive amounts of concrete beyond that which is permitted. Blasting for removal of concrete WILL NOT BE PERMITTED.

Reinforcement steel and other embedded items may be encountered during concrete removal operations. Metal items may also be encountered at other locations which are not shown. The Contractor's selection of equipment and methods shall consider the presence of such materials, and the Government will not be responsible in any way for the effect of such items on the Contractor's equipment or progress. Any such reinforcement or other embedded items exposed during concrete removal operations shall, unless otherwise directed, indicated on the drawings, or specified, be cut off

W911WN-09-B-0007 SECTION 02 41 00 Page 5 flush at the breakout depth or face. Metal and other miscellaneous items not indicated to be removed, which are encountered in the performance of the work under this contract shall not be removed without authorization of the Contracting Officer. Metal surfaces against which concrete is to be placed shall be wire brushed and cleaned to remove rust, grease, and other materials which would prevent proper bond with the concrete.

3.1.2 Rock Anchor Head Encasement

Over the planned area of the rock anchor reinforced concrete encasement, excluding the tapered top and ends of the encasement, the Contractor shall remove existing concrete to the extent necessary to expose sound substrate and stable concrete (free of loose and significantly cracked concrete) as directed by the Contracting Officer. Concrete removal over the anchor encasement area up to the volume equating to an average demolition thickness of 3 inches shall be included in the bid price. Should the Contracting Officer determine and direct that concrete removal beyond this volume is required to expose sound substrate and stable concrete, then the bases of payment for this excess volume of concrete removal will be negotiated. In other areas cited for concrete rehabilitation, the Contractor shall remove and replace existing concrete to the prescribed minimum thickness or to within the prescribed range in thickness, as applicable.

3.1.3 Removal of Concrete

Hand-held air or hydraulic-driven chipping hammers shall be considered acceptable types of power tools. Other removal methods will be permitted, with the approval of the Contracting Officer. Demolition of concrete with explosives will not be permitted. Adequate safety measures shall be provided to protect workers, equipment, and structures in the vicinity of the work. All edges of removal shall be saw cut as specified before removal begins. Precautions shall be taken to prevent chipping hammers and chisels from vibrating on reinforcing steel. All equipment shall be subject to the review and approval of the Contracting Officer.

3.1.4 Tolerances for Concrete Removal

Concrete shall be removed to the lines of removal indicated on the drawings. A tolerance of plus or minus 1-inch will be allowed about the lines indicated, unless evidence indicates that deteriorated concrete is still present, in which case removal shall continue to sound concrete, as directed by of the Contracting Officer. Concrete removals in excess of the lines and tolerance shown, if not authorized by the Contracting Officer, will not be acceptable, and such excess area removed shall be replaced by the Contractor to the satisfaction of the Contracting Officer, at no additional cost to the Government. Unauthorized concrete removals WILL NOT be acceptable, and such areas removed shall be replaced by the Contractor to the satisfaction of the Contracting Officer, at no additional cost to the Government.

3.1.5 Control of Concrete Debris

Concrete debris shall not be allowed to drop into the river. Concrete and or debris shall be collected and retained near to its point of removal.

The Contractor's method of debris control and removal shall be described in his demolition plan and must meet the approval of the Contracting Officer.

Concrete that falls into the river shall be collected by the Contractor at his own expense.

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3.2 CHAIN LINK FENCE REMOVAL

Remove chain link fencing, gates, and other related items scheduled for removal and transport to designated areas. Remove gates as whole units.

Cut chain link fabric to 25-foot lengths and store in rolls off the ground. Dispose of materials in accordance with paragraph "Disposal of Materials".

3.3 POST AND CABLE GUARDRAIL REMOVAL

Remove the posts and cable for the existing abutment guardrail scheduled for removal and transport to designated areas. Store the posts in neat piles and roll the cable into a neat coil. Dispose of materials in accordance with paragraph "Disposal of Materials".

3.4 EXISTING ABUTMENT WALL LADDER, ARMOR, AND EMBEDDED FEATURE REMOVAL

Remove existing embedded ladder, armor, and features from the existing abutment wall during concrete removal. Remove concrete in accordance with this specification section. All embedded items shall be disposed of in accordance with paragraph "Disposal of Materials".

3.5 DISPOSAL OF MATERIALS

3.5.1 General

Materials generated under this contract shall be managed and disposed of in accordance with the following paragraphs. The Contractor shall submit, as part of the Disposal Work Plan, the method(s) and safety provision(s) by which he intends to collect, handle, transport, and dispose of concrete debris and solid wastes.

3.5.2 Hauling Materials to Disposal Facilities

Care shall be exercised in hauling any debris or other materials to preclude spillage and damage to public and private property, and thoroughfares. Any materials spilled from the hauling equipment shall be removed by the Contractor at the Contractor's expense. The Contractor shall make all necessary arrangements and comply with all requirements associated with hauling the materials over streets and roads.

3.5.3 Disposal of Solid Wastes

Solid waste, including construction debris (i.e. concrete debris), rubbish, waste materials, garbage, and other discarded solid materials, shall be placed in containers and disposed on a regular schedule. Solid wastes shall be disposed of at a licensed, commercially available landfill that accepts debris of the type generated under this contract. The Contractor shall segregate the waste where appropriate for proper disposal. Untreated and unpainted scrap lumber may be disposed of with this debris where appropriate. All handling and disposal shall be conducted in such a way as to prevent spillage and contamination. The Contractor shall transport all solid waste off Government property and dispose in compliance with Federal, State, and local requirements. Metal generated from the demolition performed under this contract, may be sold as scrap.

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3.6 CONTRACTOR QUALITY CONTROL

The Contractor shall establish and maintain a quality control system for all demolition operations. The Contractor's QC system shall be in accordance with the applicable provision of Section 01 45 01 USACE QUALITY

CONTROL.

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