Attachment 1 TECHNICAL SPECIFICATIONS EIC Expansion.pdf

TECHNICAL SPECIFICATIONS

ATTACHMENT 1

PROJECT NAME: “EIC CLASSROOMS EXPANSION PROJECT,

COMAYAGUA, HONDURAS”

EIC CONSTRUCTION OF CLASSROOMS FOR THE EXPANSION OF THE ACADEMIC FACILITIES

CRIMINAL INVESTIGATION ACADEMY – COMAYAGUA, HONDURAS

TECHNICAL SPECIFICATIONS 2

TABLE OF CONTENTS

SECTION C: DESCRIPTION/SPECIFICATIONS/WORK STATEMENT

PREFACE

C.1 SCOPE SUMMARY

C.1.1 PRELIMINARY AND GENERAL REQUIREMENTS

C.1.2 DEMOLITION AND SITE MODIFICATIONS

C.1.3 EARTHWORK

C.1.4 FOUNDATIONS AND CAST – IN – PLACE CONCRETE

C.1.5 PRIMARY STRUCTURAL STEEL FRAME

C.1.6 COMPOSITE FLOOR SYSTEM

C.1.7 STAIRS, WALKWAYS AND GUARDRAIL SYSTEMS

C.1.8 WALL SYSTEMS AND BUILDING ENCLOSURES

C.1.9 ARCHITECTURAL FINISHES

C.1.10 DOORS AND WINDOWS

C.1.11 LIGHTING AND EMERGENCY LIGHTING

C.1.12 POWER DISTRIBUTION, RECEPTACLES AND DATA SYSTEM

C.1.13 TESTING, COMMISSIONING AND PROJECT CLOSEOUT

C.2 GENERAL SPECIFICATIONS

C.3 TASK SPECIFICATIONS

C.3.1 PRELIMINARIES

C.3.1.1 Mobilization and Demobilization

C.3.1.2 Temporary Facilities

C.3.1.3 Construction Layout, Survey Control, Benchmark Establishment and Field Staking

C.3.1.4 Progress Cleaning, Handling, Hauling and Off-Site Disposal of Construction Debris

C.3.2 DEMOLITION AND SITE MODIFICATIONS

C.3.2.1 Demolition and Protection of Existing Facilities

C.3.2.2 Removal and Disposal of Demolition Materials

C.3.3 EARTHWORK

C.3.3.1 Excavation

C.3.3.2 Structural Fill and Backfill

C.3.3.3 Compaction

C.3.3.4 Disposal of Surplus and Unsuitable Materials

TECHNICAL SPECIFICATIONS 3

C.3.4 FOUNDATIONS AND CAST-IN-PLACE CONCRETE

C.3.4.1 Concrete Materials

C.3.4.2 Concrete Mix Design

C.3.4.3 Reinforcing Steel

C.3.4.4 Formwork and Embedded Items

C.3.4.5 Concrete Placement and Consolidation

C.3.4.6 Concrete Quality Control

C.3.4.7 Curing and Protection

C.3.4.8 Non-Shrink Grout

C.3.5 STRUCTURAL STEEL FRAMING SYSTEM

C.3.5.1 Structural Framing System Verification

C.3.5.2 Structural Steel Materials

C.3.5.3 Fabrication Requirements

C.3.5.4 Structural Connections

C.3.5.5 Welding Requirements

C.3.5.6 Structural Steel Erection and Alignment

C.3.5.7 Anchor Rods, Base Plates and Bearing Surfaces

C.3.5.8 Surface Preparation, Protective Coatings and Final Structural Verification

C.3.6 Composite Floor System

C.3.6.1 Steel Deck System

C.3.6.2 Composite Slab Assembly

C.3.6.3 Shear Connectors and Edge Conditions

C.3.6.4 Openings and Floor System Verification

C.3.7 Stair Systems

C.3.8 Wall Systems

C.3.8.1 Panel W Partition System

C.3.8.2 Concrete Masonry Unit (CMU) Wall Extensions

C.3.9 Architectural Finishes

C.3.9.1 Wall Finishes

C.3.9.2 Painting and Sealants

C.3.9.3 Suspended Ceiling System

C.3.10 Doors and Windows

C.3.10.1 Door Systems

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C.3.10.2 Window Systems

C.3.10.3 Installation and Final Verification

C.3.11 Lighting and Emergency Lighting

C.3.11.1 Interior Lighting System

C.3.11.2 Emergency Lighting System

C.3.11.3 Installation and Final Verification

C.3.12 Power Distribution, Receptacles and Data System

C.3.12.1 Electrical Power Distribution

C.3.12.2 Receptacles and Branch Devices

C.3.12.3 Communications and Data Infrastructure

C.3.12.4 Installation and Final Verification

TECHNICAL SPECIFICATIONS 5

SECTION C: DESCRIPTION/SPECIFICATIONS/WORK STATEMENT

PREFACE

The United States Embassy in Tegucigalpa, through the Bureau of International Narcotics and Law

Enforcement Affairs (INL), maintains a cooperation program with the Criminal Investigation Police

Academy (Escuela de Investigación Criminal - EIC) of Honduras to strengthen law enforcement training capabilities.

As part of this cooperation, INL intends to construct a two-story classroom expansion inside the existing EIC training facility located at Instituto Técnico Policial (ITP), Comayagua, Honduras.

The project consists of the construction of four new classrooms supported by reinforced concrete foundations, a structural steel framing system, composite floor system, masonry walls, architectural finishes, plumbing, electrical installations, doors, windows and all associated work required for a complete and operational facility.

The Contractor shall furnish all labor, supervision, equipment, materials, transportation, testing, permits, temporary facilities and incidentals necessary to complete the project in accordance with the contract drawings and these specifications.

C.1 SCOPE SUMMARY

C.1.1 PRELIMINARY AND GENERAL REQUIREMENTS

The Contractor shall furnish all labor, supervision, project management, equipment, tools, transportation, temporary utilities, materials, permits, insurance, quality control personnel, safety measures, temporary facilities and all incidentals necessary for the successful execution of the project.

Preliminary work shall include field verification of existing conditions, layout and surveying, protection of existing facilities, temporary barriers, construction signage, mobilization and demobilization, preparation of shop drawings, material submittals, construction schedule, quality control plan and coordination with the Contracting Officer Representative (COR). The Contractor shall verify all dimensions and existing site conditions prior to the start of construction and immediately notify the COR of any discrepancies between field conditions and the contract documents.

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C.1.2 DEMOLITION AND SITE MODIFICATIONS

The Contractor shall perform all demolition, removal and modification work required inside the existing EIC training facility to accommodate the proposed two-story classroom expansion. Work shall include selective demolition of existing concrete slabs, removal of unsuitable materials, relocation or protection of existing utilities if required, and restoration of any adjacent areas affected during construction.

All demolition debris shall be removed from the project site and legally disposed of in accordance with local environmental regulations. The Contractor shall maintain safe access to the existing facility and protect adjacent structures and equipment from damage throughout the duration of the work.

C.1.3 EARTHWORK

The Contractor shall perform all earthwork required for the construction of the proposed building, including excavation, grading, proof rolling where required, moisture conditioning, backfilling and mechanical compaction.

Excavations shall be performed to the elevations indicated in the structural drawings. Unsuitable material encountered during excavation shall be removed and replaced with approved structural fill. All fill materials shall be placed in controlled lifts and compacted to the densities specified in the technical specifications. The Contractor shall be responsible for maintaining stable excavation conditions and implementing all required temporary shoring and safety measures.

C.1.4 FOUNDATIONS AND CAST – IN – PLACE CONCRETE

The Contractor shall construct all reinforced concrete foundation elements required for the complete structural support of the new facility, including isolated spread footings, reinforced concrete pedestals, grade beams, slab-on-grade repairs and all associated cast-in-place concrete work.

Concrete construction shall include reinforcing steel, anchor bolts, embedded items, formwork, concrete placement, vibration, finishing, curing and quality testing. All concrete work shall comply with the structural drawings and specified design strengths to provide a complete and durable structural foundation system.

C.1.5 PRIMARY STRUCTURAL STEEL FRAME

The Contractor shall furnish, fabricate, deliver and erect the complete structural steel framing system for the proposed two-story classroom expansion.

The work shall include structural steel columns, wide flange beams, connection plates, base plates, anchor bolts, field welding, high-strength bolted connections, temporary bracing, alignment, plumbing of the structure and all miscellaneous steel required for a complete structural system.

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All exposed structural steel shall receive shop primer and field touch-up after erection. The

Contractor shall verify all dimensions prior to fabrication and submit structural steel shop drawings for COR approval before manufacturing.

C.1.6 COMPOSITE FLOOR SYSTEM

The Contractor shall furnish and install the complete second-floor composite structural floor system, including galvanized metal deck, welded shear connectors, reinforcing steel, concrete slab, edge forms and all accessories required for a complete composite floor assembly.

The composite slab shall be constructed in accordance with the structural design and shall provide adequate strength, serviceability and fire resistance for the intended classroom occupancy.

C.1.7 STAIRS, WALKWAYS AND GUARDRAIL SYSTEMS

The Contractor shall furnish and install all steel stairways, intermediate landings, guardrails, handrails and miscellaneous metal fabrications required to provide safe access between both building levels.

All stair systems shall comply with applicable building codes regarding tread dimensions, riser heights, guardrail heights, handrail continuity and structural loading requirements.

C.1.8 WALL SYSTEMS AND BUILDING ENCLOSURES

The Contractor shall furnish and construct all wall systems required for the complete enclosure and interior distribution of the proposed classroom expansion in accordance with the architectural and structural drawings.

At the first floor, the work shall include the complete exterior enclosure using Monolit Panel (Panel

W) wall systems, including galvanized wire mesh, expanded polystyrene (EPS) core, connectors, reinforcing mesh, mortar or shotcrete application and all accessories required to provide a complete wall assembly.

At the second floor, the Contractor shall complete the perimeter enclosure by extending the existing masonry walls with concrete masonry units (CMU), as indicated in the contract drawings, to achieve the required enclosure beneath the existing roof structure. Interior classroom partitions on both levels shall be constructed using Monolit Panel (Panel W) wall systems.

The work shall also include wall reinforcement, anchors, embedded sleeves, openings for doors and windows, and all accessories required to provide a complete enclosure system in accordance with the contract drawings.

C.1.9 ARCHITECTURAL FINISHES

The Contractor shall furnish and install all architectural finishes necessary to provide a complete and functional educational facility.

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Architectural finishes shall include plastering and surface preparation of concrete masonry walls, mortar or shotcrete finishes over all Monolit Panel (Panel W) wall systems, interior and exterior painting, suspended ceiling systems, floor finishes, sealants, joint treatment, trims and all miscellaneous finish work indicated in the contract drawings.

All finish materials shall be installed in accordance with the manufacturer's recommendations and shall provide uniform appearance, proper alignment and a durable finish suitable for continuous institutional use.

C.1.10 DOORS AND WINDOWS

The Contractor shall furnish, fabricate and install all doors, frames, hardware, windows, glazing systems, anchorage devices, weather stripping, sealants and accessories shown in the contract drawings.

Prior to fabrication, shop drawings and product data shall be submitted for COR review and approval. All installed assemblies shall provide proper operation, security and weather protection.

C.1.11 LIGHTING AND EMERGENCY LIGHTING

The Contractor shall provide a complete interior lighting system including LED lighting fixtures, emergency lighting units, exit signs, branch circuits, conduits, wiring devices, switching systems and all accessories required for a complete electrical lighting installation.

All installations shall comply with the latest edition of the National Electrical Code (NEC), applicable

NFPA standards and Honduran electrical regulations.

C.1.12 POWER DISTRIBUTION, RECEPTACLES AND DATA SYSTEM

The Contractor shall furnish and install the complete electrical distribution system including panelboards, feeders, branch circuits, receptacles, grounding system, conduits, pull boxes, cable trays where indicated, structured cabling raceways and communication outlets required to support classroom operations.

All electrical work shall be coordinated with the architectural and structural systems to ensure a complete and fully functional installation.

C.1.13 TESTING, COMMISSIONING AND PROJECT CLOSEOUT

The Contractor shall perform all inspections, quality control testing and commissioning activities necessary to demonstrate that all building systems have been properly installed and are fully operational.

Project closeout shall include correction of punch list items, final cleaning, submission of as-built drawings, warranties, operation and maintenance manuals, material certifications, testing reports and all closeout documentation required for final acceptance by the Government.

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C.2 GENERAL SPECIFICATIONS

All work shall be performed in strict accordance with the drawings, technical specifications, approved submittals and applicable codes and standards. The Contractor shall provide all labor, supervision, materials, equipment, tools, transportation, temporary works, testing and incidental items necessary to complete the project as a fully integrated construction system.

The Contractor shall carefully review and coordinate all architectural, structural and electrical documents before beginning the work. In the event of conflicts, omissions, dimensional discrepancies or inconsistencies between the drawings, specifications and existing field conditions, the Contractor shall immediately notify the Contracting Officer’s Representative (COR) in writing and shall not proceed with the affected work until written clarification or direction has been received.

Approval or review by the COR shall not relieve the Contractor from responsibility for the accuracy, completeness, coordination, safety or compliance of the work.

C.2.1 TECHNICAL DOCUMENTS AND COORDINATION

The Contractor shall consider the drawings, specifications, schedules, approved submittals as complementary documents. Before construction begins, the Contractor shall coordinate the architectural, structural and electrical systems, including foundations, structural steel framing, composite floor system, Panel W wall systems, masonry wall extensions, doors, windows, ceilings, lighting, receptacles and data raceways.

The Contractor shall verify that openings, embedded items, sleeves, anchor bolts, base plates, conduits and other components are properly located before concrete placement, wall construction or structural steel fabrication. Work improperly installed due to lack of coordination shall be corrected at the Contractor’s expense.

C.2.2 FIELD VERIFICATION AND EXISTING CONDITIONS

The Contractor shall verify all dimensions, elevations, alignments, clearances and existing conditions before ordering materials, preparing shop drawings or beginning fabrication and construction.

Special attention shall be given to the existing building columns, perimeter walls, roof structure, finished floor elevations and existing installations that may interfere with the new construction. The

Contractor shall confirm the location of the new structural supports and verify that the proposed work does not conflict with the structural system of the existing warehouse.

Dimensions shall not be obtained by scaling the drawings. When field conditions differ from the design base proposed documents, the Contractor shall submit the discrepancy to the COR for review before proceeding.

TECHNICAL SPECIFICATIONS 10

C.2.3 QUANTITIES

Quantities indicated in the drawings, specifications, schedules or Government estimate are provided for reference and bidding assistance only.

The Contractor shall independently verify all measurements and quantities necessary to complete the work. No adjustment to the contract price shall be authorized because of errors, omissions or differences in estimated quantities when the work is reasonably inferable from the contract documents or required for a complete installation.

The Contractor shall include all waste factors, overlaps, connections, supports, anchors, fasteners, accessories and incidental materials required to complete each work item.

C.2.4 SUBMITTALS AND SHOP DRAWINGS

Before fabrication, procurement or installation, the Contractor shall submit product data, material samples, certifications, shop drawings and installation procedures for COR review as required by the specifications.

Shop drawings shall clearly indicate dimensions, materials, connection details, fabrication information, anchorage methods and coordination with adjacent work. At a minimum, coordinated submittals shall be provided for:

• Structural steel framing, base plates, anchor bolts and connections.

• Composite metal deck.

• Stairs, walkways, handrails and guardrails.

• Monolit Panel or Panel W wall systems.

• Concrete masonry units and associated reinforcement.

• Doors, frames, hardware, windows and glazing.

• Ceiling and architectural finish systems.

• Lighting fixtures, electrical panels, receptacles and data components.

The Contractor shall review and approve all submittals internally before transmitting them to the

COR. COR review shall not constitute authorization to deviate from the contract requirements unless the deviation is specifically identified and formally approved in writing.

C.2.5 MATERIALS, PRODUCTS AND STORAGE

All materials and products incorporated into the work shall be new, free from defects and suitable for their intended use. Materials shall comply with the specified standards, approved submittals and manufacturer recommendations.

The Contractor shall transport, handle and store materials in a manner that prevents deterioration, deformation, corrosion, moisture damage, contamination or loss. Cementitious materials, TECHNICAL SPECIFICATIONS 11 reinforcing steel, structural steel, metal deck, Panel W components, electrical equipment, doors, windows and finish materials shall be protected from weather and construction damage.

Damaged, deteriorated, contaminated or improperly stored materials shall not be incorporated into the work and shall be removed and replaced at the Contractor’s expense.

C.2.6 TRIALS, TESTING AND INSPECTIONS

Materials, equipment and completed work shall be subject to the inspections and tests necessary to verify compliance with the technical documents, approved submittals and applicable standards.

Required quality-control activities may include, but shall not necessarily be limited to:

• Soil and structural-fill compaction testing.

• Concrete slump, temperature and compressive-strength testing.

• Verification of reinforcing-steel placement.

• Inspection of anchor bolts and embedded items.

• Structural steel welding and bolted-connection inspections.

• Composite metal deck and shear-connector inspections.

• Wall-system installation and anchorage inspections.

• Electrical continuity, insulation resistance and grounding tests.

• Functional testing of lighting and emergency-lighting systems.

Testing shall be performed by qualified personnel or an independent laboratory acceptable to the

COR. The Contractor shall be responsible for all costs associated with required testing, sampling, certifications and retesting caused by nonconforming work.

Materials or completed work rejected by the COR shall be removed, repaired or replaced at the

Contractor’s expense.

C.2.7 WORK EXECUTION AND SEQUENCING

The Contractor shall execute the work in a logical, gradual and coordinated sequence. Work shall not proceed when unfinished preceding activities could affect its stability, alignment, appearance, safety or final quality.

The construction sequence shall account for selective demolition, excavation, reinforced concrete foundations, structural steel erection, composite floor construction, stairs and walkways, wall systems, architectural finishes and electrical installations.

Before covering any work, the Contractor shall obtain the required inspections and approvals.

Concealed work installed without the required inspection may be uncovered for verification at the

Contractor’s expense.

TECHNICAL SPECIFICATIONS 12

The Contractor shall maintain adequate temporary bracing and structural stability throughout construction, particularly during structural steel erection, composite slab placement and installation of wall systems.

C.2.8 PROTECTION OF EXISTING FACILITIES

The project will be constructed inside an existing EIC facility. The Contractor shall protect all existing structural elements, walls, floors, equipment, electrical installations and adjacent occupied areas that are not designated for demolition or modification.

Construction activities shall be planned to minimize dust, noise, vibration and interference with the normal operation of the facility. Temporary partitions, protective coverings, barricades and controlled access routes shall be provided as necessary.

Any existing element damaged as a result of the Contractor’s operations shall be repaired or replaced to match the original condition at no additional cost to the Government.

C.2.9 SAFETY AND SITE CONTROL

The Contractor shall be fully responsible for construction safety, site security and protection of workers, Government personnel and facility users.

The Contractor shall provide warning signs, barricades, personal protective equipment, fall-protection systems, safe access, fire extinguishers and all measures required by applicable occupational safety regulations.

Particular attention shall be given to excavation safety, structural steel erection, elevated work, welding and cutting operations, material lifting, temporary electrical installations and access between the two construction levels.

The Contractor shall maintain the work area clean and orderly and shall prevent unauthorized persons from entering active construction zones.

C.2.10 CONSTRUCTION SCHEDULE AND PROGRESS CONTROL

The Contractor shall submit a detailed construction schedule identifying the sequence, duration and planned completion date of all major activities.

The schedule shall include, at a minimum:

• Submittal preparation and review.

• Material procurement and fabrication.

• Demolition and site modifications.

• Excavation and foundations.

• Structural steel fabrication and erection.

• Composite floor construction.

• Stairs, walkways and guardrails.

TECHNICAL SPECIFICATIONS 13

• Wall and enclosure systems.

• Doors, windows and architectural finishes.

• Electrical installations.

• Testing, commissioning and project closeout.

The Contractor shall update the schedule periodically and promptly notify the COR of any condition that may affect the contractual completion date. Corrective measures and recovery plans shall be submitted when progress falls behind the approved schedule.

C.2.11 QUALITY OF WORK AND CORRECTIVE ACTION

All work shall be performed by qualified personnel experienced in the applicable construction trade.

Completed work shall be properly aligned, level, plumb, secure and free from visible defects.

Work that does not comply with the drawings, specifications, approved submittals or acceptable construction practices shall be considered nonconforming. Acceptance of previous work, progress payments or COR observation shall not prevent the Government from requiring correction of defective or noncompliant work discovered later.

The Contractor shall correct rejected work and repair any adjacent construction affected by the corrective work at no additional cost to the Government.

C.2.12 COST OF THE PROJECT

The Contractor shall include in the contract price all costs necessary to complete the project, including labor, supervision, materials, equipment, transportation, temporary facilities, testing, permits, insurance, safety measures, waste disposal, shop drawings, submittals, overhead, profit and all incidental work required by the contract documents.

The Contractor shall also include all costs associated with coordination, field verification, protection of existing facilities, temporary bracing, construction access, final cleaning and correction of punch-list items.

No additional compensation shall be provided for work that is reasonably necessary to complete the project, even when such work is not individually identified as a separate pay item.

C.2.13 GENERAL CONSTRUCTION STANDARDS

The following standards are not all-inclusive but shall apply to the project as appropriate. Unless otherwise specified, the latest adopted edition in effect at the time of solicitation shall be used:

• Código Hondureño de Construcción.

• American Concrete Institute (ACI).

• ASTM International.

• American Institute of Steel Construction (AISC).

TECHNICAL SPECIFICATIONS 14

• American Welding Society (AWS).

• Steel Deck Institute (SDI).

• Steel Joist Institute (SJI).

• Portland Cement Association (PCA).

• International Building Code (IBC), where applicable.

• National Fire Protection Association (NFPA).

• National Electrical Code (NEC/NFPA 70).

• National Electrical Manufacturers Association (NEMA).

• Underwriters Laboratories (UL).

• ANSI/TIA standards for telecommunications infrastructure.

• Applicable regulations of the Republic of Honduras and the local electrical utility.

Where a conflict exists between applicable standards, the Contractor shall notify the COR and shall comply with the more stringent requirement unless otherwise directed in writing.

C.2.14 PERMITS AND REGULATORY COMPLIANCE

The Contractor shall identify and obtain all permits, approvals, licenses and inspections required by the competent Honduran authorities for the execution and completion of the work, unless specifically identified as a Government responsibility.

The Contractor shall coordinate all required technical documentation and shall ensure that construction methods, materials and installations comply with local legal and regulatory requirements.

Copies of permits, inspection records and approvals shall be submitted to the COR and included in the project closeout documentation.

C.2.15 CLEANING AND WASTE MANAGEMENT

The Contractor shall maintain the construction area free from accumulated debris, packaging, scrap materials and unnecessary obstructions.

Waste materials shall be separated, removed and legally disposed of outside the EIC facility.

Burning, burial or uncontrolled disposal of construction waste at the project site shall not be permitted.

At completion, all work areas, floors, walls, glazing, doors, equipment and adjacent affected spaces shall be thoroughly cleaned and left ready for Government use

TECHNICAL SPECIFICATIONS 15

C.3 TASK SPECIFICATIONS

C.3.1 PRELIMINARIES

C.3.1.1 Mobilization and Demobilization

Mobilization shall include transportation of personnel, construction equipment, materials, temporary utilities, safety equipment and all resources necessary to initiate construction activities.

Construction equipment shall be maintained in proper operating condition and shall be appropriate for the intended work. Equipment producing excessive vibration, oil leakage or unsafe operating conditions shall not be used within the project site.

Temporary access routes shall be maintained free of obstructions and protected against unnecessary deterioration caused by construction traffic.

Demobilization shall include the complete removal of temporary facilities, equipment, temporary utility connections, construction debris, surplus materials, barriers, signage and protective systems installed for construction purposes.

Upon completion of the Work, all disturbed areas shall be restored to a clean and serviceable condition compatible with the surrounding existing facilities.

C.3.1.2 Temporary Facilities

The Contractor shall provide all temporary facilities necessary to support construction activities, including material storage areas, temporary electrical power, potable water, sanitary facilities, construction lighting, temporary protection systems and temporary access required for the execution of the Work.

Temporary facilities shall be located to avoid interference with existing buildings, pedestrian circulation, emergency access routes and utility corridors.

Temporary electrical installations shall comply with NFPA 70 (National Electrical Code). Distribution panels shall be properly grounded and protected against weather exposure. Damaged extension cords, exposed conductors and unauthorized splices shall not be permitted.

Construction lighting shall provide adequate illumination for safe execution of the Work.

Materials shall be protected from moisture, contamination, excessive heat, direct sunlight and mechanical damage during storage. Cementitious materials shall be stored in dry elevated locations.

Structural steel shall be stored above grade on blocking to prevent corrosion and distortion.

Moisture-sensitive materials shall remain in their original packaging until installation whenever practical.

Temporary barricades, warning signs and protective barriers shall be installed around excavations, demolition areas, overhead work and other hazardous locations.

C.3.1.3 Construction Layout, Survey Control, Benchmark Establishment and Field Staking

Construction layout shall be performed by qualified personnel using properly calibrated surveying equipment including total stations, laser levels, optical levels or equivalent precision instruments.

TECHNICAL SPECIFICATIONS 16

Permanent horizontal and vertical control points shall be established before construction begins and shall remain protected throughout the project. Benchmarks shall be periodically verified to ensure construction accuracy following excavation, concrete placement and structural steel erection.

Building grid lines, foundation centerlines, column locations, finished floor elevations and other principal reference lines shall be established prior to commencement of structural work.

Dimensions shall not be obtained by scaling drawings. Construction layout shall be based exclusively on dimensions indicated in the Contract Documents.

C.3.1.4 Progress Cleaning, Handling, Hauling and Off-Site Disposal of Construction Debris

The project site shall be maintained in a clean, orderly and safe condition throughout construction.

Construction debris, packaging materials, scrap metal, reinforcing steel remnants, surplus concrete and other waste materials shall be removed periodically to prevent interference with construction activities.

Dust generated during construction shall be controlled by appropriate methods without creating unsafe working conditions or affecting adjacent occupied facilities.

Construction debris shall be transported in suitable containers or covered vehicles and disposed of at legally authorized disposal facilities in accordance with applicable environmental regulations.

Upon completion of construction, all temporary materials, unused products, protective coverings, equipment and debris shall be removed from the site. Finished surfaces shall be cleaned using methods compatible with the installed materials and manufacturer's recommendations.

C.3.2 DEMOLITION AND SITE MODIFICATIONS

C.3.2.1 Demolition and Protection of Existing Facilities

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• General Requirements

• Selective Demolition

• Protection of Existing Structures and Utilities

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Demolition activities shall be limited to those indicated in the Contract Documents and performed in a controlled manner to prevent damage to existing structures, utilities and building components designated to remain.

Prior to commencing demolition, the Contractor shall verify existing site conditions and identify structural, architectural, electrical and mechanical elements that may be be affected by the Work.

Existing buildings, utilities, pavements, drainage systems and adjacent facilities shall be protected throughout demolition and construction activities. Temporary shoring, bracing or protective systems shall be provided whenever demolition operations could affect the stability of existing construction.

TECHNICAL SPECIFICATIONS 17

Existing utilities intended to remain in service shall be protected from accidental damage and maintained operational during construction. Any damage caused by demolition activities shall be repaired or replaced using materials and workmanship equal to or better than the original construction.

Materials designated for reuse shall be carefully removed, handled and stored to prevent damage.

C.3.2.2 Removal and Disposal of Demolition Materials

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Demolition debris shall be removed from the work area on a regular basis to maintain safe and efficient construction operations.

Concrete, masonry, reinforcing steel, structural steel, wood, glass and other demolition materials shall be handled to prevent unnecessary breakage, contamination and hazards to personnel.

Recyclable materials shall be separated whenever practical. Materials not intended for reuse shall be transported in covered vehicles and disposed of at legally authorized disposal facilities in accordance with applicable environmental regulations.

Demolition debris shall not be buried, burned or permanently stockpiled within the project site.

Upon completion of demolition activities, all affected areas shall be cleaned and prepared to receive subsequent construction operations.

C.3.3 EARTHWORK

C.3.3.1 Excavation

Excavation shall be performed in accordance with the lines, grades and elevations indicated in the approved Technical Design Documents. Existing site conditions, visible utilities and adjacent structural elements shall be verified prior to commencing excavation activities.

Due to the proximity of the proposed foundations to existing structural elements, excavation operations shall be carefully controlled to avoid undermining, disturbing or reducing the bearing capacity of adjacent foundations. If existing footings, grade beams, underground structures or any unforeseen structural element are encountered within the excavation limits or along the alignment of the proposed foundations, excavation in the affected area shall be suspended until the condition has been evaluated and incorporated into the approved Technical Design Documents. Existing structural foundations shall not be undermined or left unsupported at any time.

Excavation bottoms shall be firm, level and free of loose material, organic matter, standing water, mud and other deleterious substances before placement of foundation concrete. Where unstable, soft or unsuitable soils are encountered below the design elevation, such materials shall be removed until competent bearing material is reached and replaced with approved structural fill.

Groundwater, surface runoff and precipitation shall be controlled by temporary drainage measures, pumps or diversion channels as required to maintain dry and stable excavation conditions throughout construction.

C.3.3.2 Structural Fill and Backfill

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Structural fill shall consist of approved, clean, well-graded granular material capable of providing adequate bearing capacity and long-term stability for the proposed foundations and slabs.

The material shall be free of organic matter, vegetation, roots, topsoil, clay lumps, debris, soluble salts and other deleterious substances. Unless otherwise indicated in the approved Technical Design

Documents, structural fill shall have a maximum particle size of 50 mm (2 in.), a Liquid Limit (LL) not exceeding 35 and a Plasticity Index (PI) not exceeding 12.

Granular material shall exhibit low compressibility, adequate shear strength, good drainage characteristics and uniform gradation to minimize differential settlement and facilitate proper compaction. Materials containing excessive fines, excessive moisture or oversized particles that could impair compaction shall not be incorporated into permanent construction.

Backfill around foundations and structural elements shall not be placed until concrete has developed sufficient strength to withstand earth pressures without damage. Backfill shall be placed uniformly around structural elements to prevent differential loading or displacement.

C.3.3.3 Compaction

Structural fill and backfill shall be placed in uniform lifts not exceeding 200 mm (8 in.) of loose thickness and compacted to a minimum of 95 percent of the maximum dry density as determined in accordance with ASTM D1557 (Modified Proctor), unless otherwise established in the approved

Technical Design Documents.

Moisture content shall be maintained within the optimum range required to achieve the specified compaction. Material that is excessively wet or dry shall be conditioned prior to placement and compaction.

Compaction equipment shall be suitable for the type of material being placed and capable of producing uniform density throughout each lift.

Because the proposed construction will be performed adjacent to existing facilities, compaction methods shall be selected to minimize the transmission of vibration to existing foundations, slabs, walls and structural members. Heavy vibratory rollers or other equipment capable of generating excessive dynamic loads shall not be used where vibration could adversely affect existing construction. In confined areas or adjacent to existing structural elements, compaction shall be performed using mechanical tampers, plate compactors or equivalent equipment capable of achieving the required density without compromising the integrity of the existing structure.

Completed subgrade shall be firm, stable and free of rutting, pumping or excessive deformation prior to placement of concrete or other permanent construction.

C.3.3.4 Disposal of Surplus and Unsuitable Materials

Surplus excavation material not required for backfill operations shall be removed from the project site unless designated for reuse in the approved Technical Design Documents.

Unsuitable materials, including organic soils, vegetation, contaminated material, debris and other deleterious substances, shall not be incorporated into permanent construction.

TECHNICAL SPECIFICATIONS 19

Excavated materials designated for disposal shall be transported using suitable equipment and disposed of at legally authorized disposal facilities in accordance with applicable environmental regulations.

Upon completion of earthwork activities, all work areas shall be be properly graded, cleaned and prepared for subsequent construction operations.

C.3.4 FOUNDATIONS AND CAST-IN-PLACE CONCRETE

C.3.4.1 Concrete Materials

All materials incorporated into structural concrete shall be new, free from defects and suitable for their intended structural application. Materials shall be compatible with one another and shall comply with the requirements of the applicable ASTM standards and the approved Technical Design

Documents.

Cement

Portland cement shall comply with ASTM C150, Type I, unless otherwise specified in the approved

Technical Design Documents.

Cement shall be delivered in its original unopened packaging or transported in approved bulk delivery systems that prevent contamination and moisture intrusion.

Cement shall be stored in dry, well-ventilated, weather-protected facilities on elevated pallets or platforms to prevent direct contact with the ground and exposure to moisture. Storage areas shall be maintained in a manner that preserves material quality throughout the construction period.

Cement exhibiting evidence of moisture contamination, hardening, caking, partial hydration or deterioration shall not be incorporated into the work.

Whenever practical, a single cement type and manufacturer should be maintained throughout each individual structural element to minimize variations in color, setting characteristics and mechanical performance.

Coarse Aggregate

Coarse aggregate shall comply with ASTM C33 and shall consist of crushed stone or crushed gravel produced from sound, durable rock capable of developing the required structural concrete strength.

Aggregates shall be clean, hard, dense, well graded and free from clay, shale, organic matter, soft particles, coal, lignite, excessive dust or other deleterious substances that may reduce concrete strength or durability.

Aggregate particle size shall be compatible with reinforcement spacing, concrete cover, member dimensions and placement methods to ensure complete consolidation of the concrete without segregation or honeycombing.

Stockpiles shall be maintained to minimize contamination, segregation and excessive moisture variation throughout the construction process.

Fine Aggregate

Fine aggregate shall comply with ASTM C33 and shall consist of natural sand, manufactured sand or an approved combination of both.

TECHNICAL SPECIFICATIONS 20

Sand shall be clean, durable, uniformly graded and substantially free from clay, silt, organic materials, salts, mica and other deleterious substances that could adversely affect concrete performance.

Aggregate moisture shall be monitored during batching to maintain the specified water-cement ratio and ensure consistent concrete properties throughout production.

Gradation shall remain reasonably uniform during the course of the work to minimize variations in workability, segregation and finished concrete quality.

Water

Water used for concrete production, curing and cleaning shall be potable or shall demonstrate compliance with the quality requirements of ASTM C1602.

Water shall be free from oils, acids, alkalis, salts, organic matter or other contaminants that may adversely affect cement hydration, reinforcement protection or long-term durability of the concrete.

Chemical Admixtures

Chemical admixtures shall comply with ASTM C494.

Air-entraining admixtures, when required by the approved Technical Design Documents or environmental exposure conditions, shall comply with ASTM C260.

Only admixtures demonstrated to be compatible with the selected cementitious materials shall be incorporated into the concrete mixture.

Admixtures shall not be used to compensate for poor material quality, excessive water content or improper construction practices.

Concrete Materials Compatibility

Concrete constituent materials shall be proportioned to produce a durable, homogeneous and structurally reliable concrete mixture capable of achieving the specified design strength and service life.

Where environmental exposure conditions require increased durability, supplementary cementitious materials or additional durability measures may be incorporated into the concrete mixture, provided such modifications remain consistent with the approved Technical Design

Documents and applicable ASTM standards.

C.3.4.2 Concrete Mix Design

Concrete mixtures shall be proportioned to satisfy the structural performance, durability, workability and serviceability requirements established in the approved Technical Design

Documents.

The concrete mix shall be developed to achieve the specified compressive strength while maintaining adequate placement characteristics for each structural element and construction condition.

Unless otherwise indicated in the approved Technical Design Documents, structural concrete for foundations, pedestals, grade beams and primary structural elements shall have a minimum specified compressive strength of 4,000 psi (28 MPa) at 28 days.

TECHNICAL SPECIFICATIONS 21

The maximum water-cement ratio shall not exceed 0.50, unless a lower value is required by structural design or environmental exposure conditions.

Concrete mixture proportions shall consider, as applicable:

• Structural design strength.

• Aggregate moisture content.

• Ambient temperature during placement.

• Placement method and pumping requirements.

• Reinforcement congestion.

• Member geometry and dimensions.

• Required workability.

• Durability requirements.

• Exposure conditions.

• Compatibility of cementitious materials and chemical admixtures.

The concrete mixture shall provide adequate cohesion while minimizing segregation, excessive bleeding and plastic settlement.

Ready-mixed concrete shall comply with ASTM C94. When site batching is authorized, batching equipment shall be properly calibrated and capable of accurately controlling material proportions throughout production.

Concrete shall be mixed for a sufficient duration to ensure complete and uniform distribution of cementitious materials, aggregates, water and admixtures. Mixing equipment shall be maintained in clean operating condition to prevent contamination or unintended variations in concrete quality.

Este criterio recoge y moderniza las buenas prácticas de mezclado y control de uniformidad presentes en el documento de referencia.

Slump shall comply with ASTM C143 and shall be established by the approved concrete mix design according to the structural element, reinforcement density and placement method. Concrete consistency shall provide adequate workability while preventing segregation and excessive water migration.

Additional water shall not be introduced into the concrete after batching except where specifically permitted by ASTM C94 and performed in accordance with the documented concrete mix design.

The concrete mix design shall remain consistent throughout each structural placement. Any modification affecting material proportions, admixtures, cementitious content or performance characteristics shall maintain compliance with the structural performance requirements established in the approved Technical Design Documents.

C.3.4.3 Reinforcing Steel

All reinforcing steel shall comply with the latest edition of ASTM A615 Grade 60, unless otherwise specified in the approved Technical Design Documents. Weldable reinforcement, where required, shall comply with ASTM A706.

TECHNICAL SPECIFICATIONS 22

The fabrication, detailing, placement and installation of reinforcing steel shall conform to the requirements of ACI 318, ACI 301, and the approved Technical Design Documents.

Reinforcing Steel Fabrication

Reinforcing bars shall be fabricated in accordance with the approved reinforcing details and bending schedules.

All reinforcement shall be cold bent using approved mechanical equipment. Heating reinforcing bars for bending, straightening or field modification shall not be permitted unless specifically addressed within the approved Technical Design Documents.

Bars exhibiting cracks, excessive deformation or mechanical damage resulting from fabrication shall not be incorporated into the permanent work.

Field cutting shall be performed using methods that do not alter the mechanical properties of the reinforcing steel.

Reinforcing Steel Condition

Prior to installation, reinforcing steel shall be clean and free from oil, grease, paint, mud, excessive rust, mill scale, concrete residue or other foreign materials that could reduce the bond between the reinforcing steel and concrete.

Light surface oxidation that does not impair bond performance shall be acceptable.

Reinforcement contaminated during construction activities shall be cleaned before concrete placement.

These requirements are consistent with current reinforcing steel installation practices while preserving the technical intent of the previous specification regarding reinforcement cleanliness and bond performance.

Reinforcement Placement

Reinforcing steel shall be accurately positioned in accordance with the approved Technical Design

Documents and shall remain securely fixed throughout concrete placement, consolidation and finishing operations.

Concrete cover, reinforcement spacing, lap splice locations, development lengths, hooks and bar arrangements shall conform to the approved Technical Design Documents.

Reinforcement shall be adequately supported using concrete blocks, plastic chairs, metal supports or other approved spacers capable of maintaining the required concrete cover without displacement.

Reinforcing bars shall be securely tied using annealed steel wire of appropriate size to maintain reinforcement stability during concrete placement.

The reinforcement cage shall remain sufficiently rigid to prevent movement resulting from worker traffic, equipment loads or concrete vibration.

Lap Splices and Mechanical Splices

Lap splice lengths, mechanical couplers and reinforcement development lengths shall comply with the requirements established in ACI 318 and the approved Technical Design Documents.

TECHNICAL SPECIFICATIONS 23

Mechanical couplers, where utilized, shall be compatible with the specified reinforcing steel and shall develop the required tensile capacity of the connected reinforcement.

Field welding of reinforcing bars shall not be permitted unless specifically detailed within the approved Technical Design Documents and performed in accordance with applicable AWS requirements.

Reinforcement Inspection

Immediately before concrete placement, reinforcement shall be visually inspected to verify:

• Bar size and grade.

• Reinforcement spacing.

• Concrete cover.

• Lap splice lengths.

• Reinforcement stability.

• Cleanliness of reinforcing steel.

• Location of embedded items.

• Compatibility with the approved Technical Design Documents.

Concrete placement shall not begin until reinforcement is properly secured and capable of maintaining its design position throughout the placement process.

C.3.4.4 Formwork and Embedded Items

Formwork shall be designed, fabricated and erected to safely support all fresh concrete loads, construction loads, vibration forces and other temporary loads that may occur during construction without excessive deformation or movement.

The Contractor shall be responsible for the engineering, design and stability of the temporary formwork system.

Formwork design shall consider hydrostatic concrete pressure, placement rate, member geometry, construction sequence and anticipated environmental conditions.

Formwork Materials

Formwork may consist of steel, plywood, timber or other engineered forming systems capable of producing the required structural geometry and concrete surface finish.

Form surfaces shall be clean, rigid, smooth and free from defects that may affect the finished concrete surface.

Damaged or excessively deteriorated forming materials shall not be reused where dimensional accuracy or concrete finish may be compromised.

Formwork Construction

Formwork shall be accurately aligned, adequately braced and sufficiently…