NEC parking expansion Specifications (4).pdf

UNITED STATES DEPARTMENT OF STATE

LUSAKA

Lusaka Embassy Parking Expansion Project

STANDARD SPECIFICATIONS

CONTENTS

SECTION

02221 BUILDING DEMOLITION

02300 EARTHWORK

02751 CEMENT CONCRETE PAVEMENT

02764 PAVEMENT JOINT SEALANTS

02780 UNIT PAVERS

02900 PLANTING

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

LUSAKA EMBASSY

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

SECTION 02221 - BUILDING DEMOLITION

1. PART 1 GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Demolition and removal of buildings and structures.

2. Demolition and removal of site improvements adjacent to a building or structure to be demolished.

3. Abandoning in place and removing below-grade construction.

B. Disconnecting, capping or sealing, and abandoning in place and removing site utilities. Remove existing elements if removal is necessary to accommodate the new design or as identified in

Section C of the RFP. These elements include, but are not limited to:

1. Foundation walls and footings.

2. Concrete slabs on grade.

3. Pavements and curbs. Manholes and covers.

4. Curb inlets and catch basins.

5. Underground storage tanks.

6. Underground petroleum products piping.

7. Fences and gates.

8. Utility meters and other equipment and exposed piping.

9. Creosote-treated wood utility poles.

10. All abandoned pipes, ducts, and conduits, whether above or below ground.

11. Relocate existing construction and utilities designated to remain as required for the design.

1.2 DEFINITIONS

A. Remove: Detach items from existing construction and legally dispose of them off-site unless indicated to be removed and salvaged.

B. Remove and Salvage: Detach items from existing construction and deliver them to Embassy.

C. Existing to Remain: Existing items of construction that are not to be removed and that are not otherwise indicated to be Removed or Removed and Salvaged.

1.3 SUBMITTALS

A. Proposed Environmental-Protection, Dust-Control and Noise-Control Measures: Submit statement or drawing that indicates the measures proposed for use, proposed locations, and proposed time frame for their operation. Identify options if proposed measures are later determined to be inadequate.

B. Schedule of Building Demolition Activities: Indicate the following:

1. Detailed sequence of demolition and removal work, with starting and ending dates for each activity.

2. Interruption of utility services.

3. Coordination for shutoff, capping, and continuation of utility services.

4. Locations of temporary protection and means of egress, including for other tenants affected by building demolition operations.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

5. Coordination of Post's continuing occupancy of adjacent buildings and partial use of premises.

1.4 QUALITY ASSURANCE

A. Health Hazards Regulatory Requirements:

1. Whenever construction operations could result in worker contact with hazardous materials, follow recommendations of the Post Occupation, Safety and Health Officer.

2. Existing Lead-Based Paint: Comply with 29 CFR 1926.62; either removal or recoating is acceptable.

1.5 PROJECT CONDITIONS

A. Buildings to be demolished will be vacated and their use discontinued before start of Work. Post assumes no responsibility for buildings and structures to be demolished.

B. Storage or sale of removed items or materials on-site is not permitted.

2. PART 2 - PRODUCTS (Not Used)

3. PART 3 – EXECUTION

3.1. EXAMINATION

A. Survey existing conditions and correlate with requirements indicated to determine extent of building demolition required.

B. Review Project Record Documents of existing construction provided by Post. Post does not guarantee that existing conditions are the same as those indicated in Project Record

Documents.

C. Inventory and record the condition of items to be removed and salvaged.

D. When unanticipated mechanical, electrical, or structural elements are encountered, investigate and measure the nature and extent of the element.

E. Perform an engineering survey of condition of building to determine whether removing any element might result in structural deficiency or unplanned collapse of any portion of structure or adjacent structures during building demolition operations.

F. Verify that hazardous materials have been remediated before proceeding with building demolition operations.

3.2. PREPARATION

A. Existing Utilities: Locate, identify, disconnect, and seal or cap off indicated utilities serving buildings and structures to be demolished.

1. Arrange to shut off indicated utilities with utility companies.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

2. If utility services are required to be removed, relocated, or abandoned, before proceeding with building demolition provide temporary utilities that bypass buildings and structures to be demolished and that maintain continuity of service to other buildings and structures.

3. Cut off pipe or conduit a minimum of 610 mm below grade. Cap, valve, or plug and seal remaining portion of pipe or conduit after bypassing.

B. Temporary Shoring: Provide and maintain interior and exterior shoring, bracing, or structural support to preserve stability and prevent unexpected movement or collapse of construction being demolished.

Strengthen or add new supports when required during progress of demolition.

C. Removed and Salvaged Items: Comply with the following:

1. Clean salvaged items of dirt and demolition debris.

2. Pack or crate items after cleaning. Identify contents of containers.

a. Store items in a secure area until delivery to Post storage Area.

b. Transport items to Post's storage area on-site, off-site or designated by Post or indicated on

Drawings.

3. Protect items from damage during transport and storage.

3.3. PROTECTION

A. Existing Facilities: Protect adjacent walkways, loading docks, building entries, and other building facilities during demolition operations.

Existing Items to Remain: Protect construction indicated to remain against damage and soiling during demolition. When permitted by Post, items may be removed to a suitable, protected storage location during demolition, cleaned and reinstalled in their original locations after demolition operations are complete.

B. Existing Utilities: Maintain utility services indicated to remain and protect them against damage during demolition operations.

1. Do not interrupt existing utilities serving adjacent occupied or operating facilities unless authorized in writing by Post and authorities having jurisdiction.

2. Provide temporary services during interruptions to existing utilities, as acceptable to Post and to authorities having jurisdiction.

3. Provide at least 72 hours' notice to Post if shutdown of service is required during changeover.

C. Temporary Protection: Erect temporary protection, such as walks, fences, railings, canopies, and covered passageways and as indicated.

1. Protect existing site improvements, appurtenances, and landscaping to remain.

2. Erect a plainly visible fence around drip line of individual trees or around perimeter drip line of groups of trees to remain.

3. Provide temporary barricades and other protection required to prevent injury to people and damage to adjacent buildings and facilities to remain.

4. Provide protection to ensure safe passage of people around building demolition area and to and from occupied portions of adjacent buildings and structures.

5. Protect walls, windows, roofs, and other adjacent exterior construction that are to remain and that are exposed to building demolition operations.

6. Erect and maintain dustproof partitions and temporary enclosures to limit dust and dirt migration and to separate areas from fumes and noise from occupied portions of adjacent buildings.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

3.4. DEMOLITION

A. Demolish indicated existing site improvements completely. Use methods required to complete the

Work within limitations of governing regulations and as follows:

1. Do not use cutting torches until work area is cleared of flammable materials. Maintain fire watch and portable fire-suppression devices during flame-cutting operations.

2. Maintain adequate ventilation when using cutting torches.

3. Locate building demolition equipment and remove debris and materials so as not to impose excessive loads on supporting walls, floors, or framing.

B. Engineering Surveys: Perform surveys as the Work progresses to detect hazards that may result from building demolition activities.

C. Site Access and Temporary Controls: Conduct building demolition and debris-removal operations to ensure minimum interference with roads, streets, walks, walkways, and other adjacent occupied and used facilities.

1. Do not close or obstruct streets, walks, walkways, or other adjacent occupied or used facilities without permission from Post and authorities having jurisdiction. Provide alternate routes around closed or obstructed traffic ways if required by authorities having jurisdiction.

2. Use water mist and other suitable methods to limit spread of dust and dirt. Comply with governing environmental-protection regulations. Do not use water when it may damage.

adjacent construction or create hazardous or objectionable conditions, such as ice, flooding, and pollution.

D. Proceed with demolition of structural framing members systematically, from higher to lower level.

Complete building demolition operations above each floor or tier before disturbing supporting members on the next lower level.

E. Concrete: Cut concrete full depth at junctures with construction indicated to remain, using power-driven saw, then remove concrete between saw cuts.

F. Masonry: Cut masonry at junctures with construction indicated to remain, using power-driven saw, then remove masonry between saw cuts.

G. Concrete Slabs-on-Grade: Saw-cut perimeter of area to be demolished at junctures with construction indicated to remain, then break up and remove.

1. Structural Steel: Dismantle field connections without bending or damaging steel members. Do not use flame-cutting torches unless otherwise authorized by Post through the COR.

2. Transport steel trusses and joists as whole units without dismantling them further.

H. Equipment: Disconnect equipment at nearest fitting connection to services, complete with service valves. Remove as whole units, complete with controls.

I. Below-Grade Construction: Abandon foundation walls and other below-grade construction.

J. Cut below-grade construction flush with grade.

K. Below-Grade Construction: Demolish foundation walls and other below-grade construction that is within 1.5 m outside of footprint indicated for new construction. Abandon below-grade construction outside this area.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

Remove below-grade construction, including basements, foundation walls, and footings to depths indicated.

L. Below-Grade Construction: Demolish foundation walls and other below-grade construction.

Remove below-grade construction, including basements, foundation walls, and footings to depths indicated.

M. Existing Utilities: Abandon existing utilities and below-grade utility structures. Cut utilities flush with grade.

N. Existing Utilities: Demolish existing utilities and below-grade utility structures that are within 1.5 m outside of footprint indicated for new construction. Abandon utilities outside this area.

Fill abandoned utility structures with satisfactory soil materials according to backfill requirements in Division 2 Section "Earthwork."

O. Existing Utilities: Demolish and remove existing utilities and below-grade utility structures.

P. Explosives: Use of explosives is not permitted.

3.5. SITE RESTORATION

A. Below-Grade Areas: Rough grade below-grade areas ready for further excavation or new construction.

B. Site Grading: Uniformly rough grade area of demolished construction to a smooth surface, free from irregular surface changes. Provide a smooth transition between adjacent existing grades and new grades.

3.6. REPAIRS

A. General: Promptly repair damage to adjacent construction caused by building demolition

Operations

B. Where repairs to existing surfaces are required, patch to produce surfaces suitable for new materials.

C. Restore exposed finishes of patched areas and extend restoration into adjoining construction in a manner that eliminates evidence of patching and refinishing.

3.7. DISPOSAL OF DEMOLISHED MATERIALS

A. Except for items or materials indicated to be reused, salvaged, reinstalled, or otherwise. indicated to remain Post's property, remove demolished materials from Project site and legally dispose of them.

1. Do not allow demolished materials to accumulate on-site.

2. Remove and transport debris in a manner that will prevent spillage on adjacent surfaces and areas.

B. Burning: Do not burn demolished materials.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

C. Disposal: Transport demolished materials off Post's property and legally dispose of them.

3.8. CLEANING

A. Clean adjacent structures and improvements of dust, dirt, and debris caused by building demolition operations.

B. Return adjacent areas to condition existing before building demolition operations began.

END OF SECTION 02221

SECTION 02300 – EARTHWORK

1. PART 1 – GENERAL

1.1. SUMMARY

This Section includes the following:

A. Preparing subgrades for walks pavements lawns grasses and exterior plants.

B. Excavating and backfilling for buildings and structures.

C. Subbase course for concrete walks and pavements.

D. Subbase and base course for asphalt paving.

E. Subsurface drainage backfills for walls and trenches.

F. Excavating and backfilling for utility trenches.

G. Excavating and backfilling trenches for buried mechanical and electrical utilities and pits for buried utility structures.

1.2. DEFINITIONS

A. Backfill: Soil material or controlled low-strength material used to fill an excavation.

1. Initial Backfill: Backfill placed beside and over pipe in a trench, including haunches to support sides of pipe.

2. Final Backfill: Backfill placed over initial backfill to fill a trench.

B. Base Course: Course placed between the subbase course and hot-mix asphalt paving.

C. Bedding Course: Course placed over the excavated subgrade in a trench before laying pipe.

D. Borrow Soil: Satisfactory soil imported from off-site for use as fill or backfill.

E. Drainage Course: Course supporting the slab-on-grade that also minimizes upward capillary flow of pore water.

F. Excavation: Removal of material encountered above subgrade elevations and to lines and dimensions indicated.

1. Authorized Additional Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions as directed by COR.

2. Bulk Excavation: Excavation more than 3.00 m in width and more than 9.00 m in length.

3. Unauthorized Excavation: Excavation below subgrade elevations or beyond indicated lines and dimensions without direction by COR. Unauthorized excavation, as well as remedial work directed by COR, shall be without additional compensation.

G. Fill: Soil materials used to raise existing grades.

H. Rock: Rock material in beds, ledges, unstratified masses, conglomerate deposits, and boulders of rock material that exceed0.75 m3 for bulk excavation or 0.60 m3 for footing, trench, and pit excavation that cannot be removed by rock excavating equipment equivalent to the following in size and performance ratings, without systematic drilling, ram hammering, ripping, or blasting, when permitted:

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

I. Rock: Rock material in beds, ledges, unstratified masses, conglomerate deposits, and boulders of rock material 0.60 m3 or more in volume that exceed a standard penetration resistance of 100 blows/50 mm when tested by an independent geotechnical testing agency, according to ASTM D 1586.

J. Structures: Buildings, footings, foundations, retaining walls, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface.

K. Subbase Course: Course placed between the subgrade and base course for hot mix asphalt pavement, or course placed between the subgrade and a cement concrete pavement, or a cement concrete or hot-mix asphalt walk.

L. Subgrade: Surface or elevation remaining after completing excavation, or top surface of a fill or backfill immediately below subbase, drainage fill, or topsoil materials.

M. Utilities: On-site underground pipes, conduits, ducts, and cables, as well as underground services within buildings.

1.3. SUBMITTALS

A. Product Data: For the following:

1. Each type of plastic warning tape.

2. Geotextile.

3. Controlled low-strength material, including design mixture.

4. Geofoam.

B. Samples: 300 by 300 Sample of subdrainage geotextile.

C. Material Test Reports: From a qualified testing agency indicating and interpreting test results for compliance of the following with requirements indicated:

1. Classification according to ASTM D 2487 of each borrow soil material proposed for fill and backfill.

2. Laboratory compaction curve according to ASTM D 1557 for each borrow soil material proposed for fill and backfill.

D. Pre-excavation Photographs or Videotape: Show existing conditions of adjoining construction and site improvements, including finish surfaces, that might be misconstrued as damage caused by earthwork operations. Submit before earthwork begins.

1.4. QUALITY ASSURANCE

Pre-excavation Conference: Conduct conference at Project site to comply with requirements in Division

1 Section "Project Management and Coordination."

1.5. PROJECT CONDITIONS

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

A. Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted in writing by COR and then only after arranging to provide temporary utility services according to requirements indicated.

1. Notify COR not less than two days in advance of proposed utility interruptions.

2. Do not proceed with utility interruptions without COR's written permission.

3. Contact utility-locator service for area where Project is located before excavating.

B. Demolish and completely remove from site existing underground utilities indicated to be removed.

Coordinate with utility companies to shut off services if lines are active.

2. PART 2 – PRODUCTS

2.1. SOIL MATERIALS

A. General: Provide borrow soil materials when sufficient satisfactory soil materials are not available from excavations.

B. Satisfactory Soils: ASTM D 2487 Soil Classification Groups GW, GP, GM, SW, SP, and SM

AASHTO M 145 Soil Classification Groups A-1, A-2-4, A-2-5, and A-3, or a combination of these groups; free of rock or gravel larger than 75 mm in any dimension, debris, waste, frozen materials, vegetation, and other deleterious matter.

C. Unsatisfactory Soils: Soil Classification Groups GC, SC, CL, ML, OL, CH, MH, OH, and PT according to ASTM D 2487, A-2-6, A-2-7, A-4, A-5, A-6, and A-7 according to AASHTO M 145, or a combination of these groups.

Unsatisfactory soils also include satisfactory soils not maintained within 2 percent of optimum moisture content at time of compaction.

D. Subbase Material: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 37.5 mm sieve and not more than 12 percent passing a 0.075 mm (No. 200) sieve.

E. Base Course: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 95 percent passing a 37.5 mm sieve and not more than 8 percent passing a 0.75 mm (No. 200) sieve.

E. Engineered Fill: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; with at least 90 percent passing a 37.5 mm sieve and not more than 12 percent passing a 0.075 mm (No. 200) sieve.

F. Bedding Course: Naturally or artificially graded mixture of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D 2940; except with 100 percent passing a 1-inch (25-

mm) sieve and not more than 8 percent passing a 0.075 mm (No. 200) sieve.

G. Drainage Course: Narrowly graded mixture of crushed stone or crushed or uncrushed gravel;

ASTM D 448; coarse-aggregate grading Size 57; with 100 percent passing a 37.5 mm sieve and 0 to 5 percent passing a 2.36 mm (No. 8) sieve.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

H. Filter Material: Narrowly graded mixture of natural or crushed gravel, or crushed stone and natural sand; ASTM D 448; coarse-aggregate grading Size 67; with 100 percent passing a25mm sieve and

0 to 5 percent passing a 4.75 mm (No. 4) sieve.

I. Sand: ASTM C 33; fine aggregate, natural, or manufactured sand.

J. Impervious Fill: Clayey gravel and sand mixture capable of compacting to a dense state.

2.2. GEOTEXTILES

A. Subsurface Drainage Geotextile: Nonwoven needle-punched geotextile, manufactured for subsurface drainage applications, made from polyolefins or polyesters; with elongation greater than 50 percent; complying with AASHTO M 288 and the following, measured per test methods referenced:

1. Survivability: Class 2; AASHTO M 288.

2. Grab Tensile Strength: 700 N; ASTM D 4632.

3. Sewn Seam Strength: 630 N; ASTM D 4632.

4. Tear Strength: 250 N; ASTM D 4533.

5. Puncture Strength: 250 N; ASTM D 4833.

6. Apparent Opening Size: No. 40 (0.425-mm) sieve, maximum; ASTM D 4751.

7. Permittivity: 0.5 per second, minimum; ASTM D 4491.

8. UV Stability: 50 percent after 500 hours' exposure; ASTM D 4355.

B. Separation Geotextile: Woven geotextile fabric, manufactured for separation applications, made from polyolefins or polyesters; with elongation less than 50 percent; complying with AASHTO M

288 and the following, measured per test methods referenced:

1. Survivability: Class 2; AASHTO M 288.

2. Grab Tensile Strength: 1100 N; ASTM D 4632.

3. Sewn Seam Strength: 1000 N; ASTM D 4632.

4. Tear Strength: 400 N; ASTM D 4533.

5. Puncture Strength: 400 N; ASTM D 4833.

6. Apparent Opening Size: 0.250 mm (No. 60) sieve, maximum; ASTM D 4751.

7. Permittivity: 0.02 per second, minimum; ASTM D 4491.

8. UV Stability: 50 percent after 500 hours' exposure; ASTM D 4355.

2.3. CONTROLLED LOW-STRENGTH MATERIAL

A. Controlled Low-Strength Material: Low-density, self-compacting, flowable concrete material as follows:

1. Portland Cement: ASTM C 150, Type I

2. Fly Ash: ASTM C 618, Class C or F.

3. Normal-Weight Aggregate: ASTM C 33, [20 mm] [10 mm] nominal maximum aggregate size.

4. Foaming Agent: ASTM C 869.

5. Water: ASTM C 94/C 94M.

6. Air-Entraining Admixture: ASTM C 260.

B. Produce low-density, controlled low-strength material with the following physical properties:

1. As-Cast Unit Weight: [480 to 580 kg/m3] [580 kg/m3 to 680 kg/m3] at point of placement, when tested according to ASTM C 138/C 138M.

2. Compressive Strength: [550 kPa] [1000 kPa] , when tested according to ASTM C 495.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

C. Produce conventional-weight, controlled low-strength material with [550 kPa] [1000 kPa] compressive strength when tested according to ASTM C 495.

2.4. ACCESSORIES

A. Warning Tape: Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, 150 mm wide and 0.1 mm (4 mils) thick, continuously inscribed with a description of the utility; colored as follows:

B. Detectable Warning Tape: Acid- and alkali-resistant polyethylene film warning tape manufactured for marking and identifying underground utilities, a minimum of 150 mm wide and

0.1 mm (4 mils) thick, continuously inscribed with a description of the utility, with metallic core encased in a protective jacket for corrosion protection, detectable by metal detector when tape is buried up to 750 mm deep; colored as follows:

1. Red: Electric.

2. Yellow: Gas, oil, steam, and dangerous materials.

3. Orange: Telephone and other communications.

4. Blue: Water systems.

5. Green: Sewer systems.

3.1. PREPARATION

A. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by settlement, lateral movement, undermining, washout, and other hazards created by earthwork.

B. Preparation of subgrade for earthwork operations including removal of vegetation, topsoil, debris, obstructions, and deleterious materials from ground surface

C. Protect and maintain erosion and sedimentation controls during earthwork operations.

D. Provide protective insulating materials to protect subgrades and foundation soils against freezing temperatures or frost.

3.2. DEWATERING

A. Prevent surface water and ground water from entering excavations, from ponding on prepared subgrades, and from flooding Project site and surrounding area.

B. Protect subgrades from softening, undermining, washout, and damage by rain or water accumulation.

1. Reroute surface water runoff away from excavated areas. Do not allow water to accumulate in excavations. Do not use excavated trenches as temporary drainage ditches.

2. Install a dewatering system to keep subgrades dry and convey ground water away from excavations. Maintain until dewatering is no longer required.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

3.3. EXPLOSIVES

A. Explosives: Do not use explosives.

B. Explosives: Obtain written permission from authorities having jurisdiction before bringing explosives to Project site or using explosives on Project site.

1. Perform blasting without damaging adjacent structures, property, or site improvements.

2. Perform blasting without weakening the bearing capacity of rock subgrade and with the least-practicable disturbance to rock to remain.

3.4. EXCAVATION, GENERAL

A. Unclassified Excavation: Excavate to subgrade elevations regardless of the character of surface and subsurface conditions encountered. Unclassified excavated materials may include rock, soil materials, and obstructions. No changes in the Contract Sum or the Contract Time will be authorized for rock excavation or removal of obstructions.

1. If excavated materials intended for fill and backfill include unsatisfactory soil materials and rock, replace with satisfactory soil materials.

2. Remove rock to lines and grades indicated to permit installation of permanent construction without exceeding the following dimensions:

a. 600 mm outside of concrete forms other than at footings.

b. 300 mm outside of concrete forms at footings.

c. 150 mm outside of minimum required dimensions of concrete cast against grade.

d. Outside dimensions of concrete walls indicated to be cast against rock without forms or exterior waterproofing treatments.

e. 150 mm beneath bottom of concrete slabs on grade.

f. 150 mm beneath pipe in trenches, and the greater of 600 mm wider than pipe or

1100 mm wide.

B. Classified Excavation: Excavate to subgrade elevations. Material to be excavated will be classified as earth and rock. Do not excavate rock until it has been classified and cross sectioned by COR. The Contract Sum will be adjusted for rock excavation according to unit prices included in the Contract Documents. Changes in the Contract time may be authorized for rock excavation.

1. Earth excavation includes excavating pavements and obstructions visible on surface.

underground structures, utilities, and other items indicated to be removed; together with soil, boulders, and other materials not classified as rock or unauthorized excavation.

a. Intermittent drilling: blasting, if permitted; ram hammering; or ripping of material not classified as rock excavation is earth excavation.

2. Rock excavation includes removal and disposal of rock. Remove rock to lines and subgrade elevations indicated to permit installation of permanent construction without exceeding the following dimensions:

a. 600 mm outside of concrete forms other than at footings.

b. 300 mm outside of concrete forms at footings.

c. 150 mm outside of minimum required dimensions of concrete cast against grade.

d. Outside dimensions of concrete walls indicated to be cast against rock without forms or exterior waterproofing treatments.

e. 150 mm beneath bottom of concrete slabs on grade.

f. 150 mm beneath pipe in trenches, and the greater of 600 mm wider than pipe or

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

1100 mm wide.

3.5. EXCAVATION FOR STRUCTURES

A. Excavate to indicated elevations and dimensions within a tolerance of plus or minus 1 inch

(25mm). If applicable, extend excavations a sufficient distance from structures for placing and removing concrete formwork, for installing services and other construction, and for inspections.

1. Excavations for Footings and Foundations: Do not disturb bottom of excavation.

Excavate by hand to final grade just before placing concrete reinforcement. Trim bottoms to required lines and grades to leave solid base to receive other work.

2 Excavation for Underground Tanks, Basins, and Mechanical or Electrical Utility

Structures: Excavate to elevations and dimensions indicated within a tolerance of plus or minus 25 mm. Do not disturb bottom of excavations intended as bearing surfaces.

3.6. EXCAVATION FOR WALKS AND PAVEMENTS

Excavate surfaces under walks and pavements to indicated lines, cross sections, elevations, and subgrades.

3.7. EXCAVATION FOR UTILITY TRENCHES

A. Excavate trenches to indicated gradients, lines, depths, and elevations.

1. Beyond building perimeter, excavate trenches to allow installation of top of pipe below frost line.

2. See Technical Security Drawings for duct bank requirements.

B. Excavate trenches to uniform widths to provide the following clearance on each side of pipe or conduit. Excavate trench walls vertically from trench bottom to 300 mm higher than top of pipe or conduit, unless otherwise indicated.

Clearance: 300 mm each side of pipe or conduit.

C. Trench Bottoms: Excavate and shape trench bottoms to provide uniform bearing and support of pipes and conduit. Shape subgrade to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits. Remove projecting stones and sharp objects along trench subgrade.

1. For pipes and conduit less than 150 mm in nominal diameter and flat-bottomed, multiple-duct conduit units, hand-excavate trench bottoms and support pipe and conduit on an undisturbed subgrade.

2. For pipes and conduit 150 mm or larger in nominal diameter, shape bottom of trench to support bottom 90 degrees of pipe circumference. Fill depressions with tamped sand backfill.

3. Excavate trenches 150 mm deeper than elevation required in rock or other unyielding bearing material to allow for bedding course.

D. Trench Bottoms: Excavate trenches 100 mm deeper than bottom of pipe elevation to allow for bedding course. Hand excavates for bell of pipe.

Excavate trenches 150 mm deeper than elevation required in rock or other unyielding bearing material to allow for bedding course.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

3.8. SUBGRADE INSPECTION

A. Notify COR when excavations have reached required subgrade.

B. If COR determines that unsatisfactory soil is present, continue excavation and replace with compacted backfill or fill material as directed.

C. Proof-roll subgrade with heavy pneumatic-tired equipment to identify soft pockets and areas of excess yielding. Do not proof roll wet or saturated subgrades.

1. Completely proof-roll subgrade in repeating proof-rolling in direction perpendicular to first direction. Limit vehicle speed to5 km/h (3 mph).

2. Proof-roll with a loaded 10-wheel, tandem-axle dump truck weighing not less than 14 tons.

3. Excavate soft spots, unsatisfactory soils, and areas of excessive pumping or rutting, as determined by COR and replace with compacted backfill or fill as directed.

D. Authorized additional excavation and replacement material will be paid for according to Contract provisions for unit prices.

E. Reconstruct subgrades damaged by freezing temperatures, frost, rain, accumulated water, or construction activities, as directed by COR, without additional compensation.

3.9. UNAUTHORIZED EXCAVATION

Fill unauthorized excavation under foundations or wall footings by extending bottom elevation of concrete foundation or footing to excavation bottom, without altering top elevation. Lean concrete fill, with 28-day compressive strength of 17.5 MPa, may be used when approved by COR.

Fill unauthorized excavations under other construction or utility pipe as directed by COR.

3.10. STORAGE OF SOIL MATERIALS

Stockpiled borrow soil materials and excavated satisfactory soil materials without intermixing. Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust.

Stockpile soil materials away from edge of excavations. Do not store within drip line of remaining trees.

3.11. BACKFILL

A. Place and compact backfill in excavations promptly, but not before completing the following:

1. Construction below finish grade including, where applicable, subdrainage, damp proofing,

2. waterproofing, and perimeter insulation.

3. Surveying locations of underground utilities for Record Documents.

4. Testing and inspecting underground utilities.

5. Removing concrete formwork.

6. Removing trash and debris.

7. Removing temporary shoring and bracing, and sheeting.

8. Installing permanent or temporary horizontal bracing on horizontally supported walls.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

B. Places backfill on subgrades free of mud, frost, snow, or ice.

3.12. UTILITY TRENCH BACKFILL

A. Place backfill on subgrades free of mud, frost, snow, or ice.

B. Place and compact bedding course on trench bottoms and where indicated. Shape bedding course to provide continuous support for bells, joints, and barrels of pipes and for joints, fittings, and bodies of conduits.

C. Provide 100 mm thick, concrete-base slab support for piping or conduit less than 750 mm below surface of roadways. After installing and testing, completely encase piping or conduit in a minimum of 100 mm of concrete before backfilling or placing roadway subbase.

D. Place and compact initial backfill of satisfactory soil, free of particles larger than 25 mm in any dimension, to a height of 300 mm over the utility pipe or conduit.

Carefully compact initial backfill under pipe haunches and compact evenly up on both sides and along the full length of utility piping or conduit to avoid damage or displacement of piping or conduit. Coordinate backfilling with utilities testing.

E. Controlled Low-Strength Material: Place initial backfill of controlled low-strength material to a height of 300 mm over the utility pipe or conduit.

F. Backfill voids with satisfactory soil while installing and removing shoring and bracing.

G. Place and compact final backfill of satisfactory soil to final subgrade elevation.

H. Controlled Low-Strength Material: Place final backfill of controlled low-strength material to final subgrade elevation.

I. Install warning tape directly above utilities, 300 mm below finished grade, except 150 mm below subgrade under pavements and slabs.

3.13. SOIL FILL

A. Plow, scarify, bench, or break up sloped surfaces steeper than 1 vertical to 4 horizontal so fill material will bond with existing material.

B. Place and compact fill material in layers to required elevations as follows:

1. Under grass and planted areas, use satisfactory soil material.

2. Under walks and pavements, use satisfactory soil material.

3. Under steps and ramps, use engineered fill.

4. Under building slabs, use engineered fill.

5. Under footings and foundations, use engineered fill.

C. Place soil fill on subgrades free of mud, frost, snow, or ice.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

3.14. SOIL MOISTURE CONTROL

A. Uniformly moisten or aerate subgrade and each subsequent fill or backfill soil layer before compaction to within 2 percent of optimum moisture content.

1. Do not place backfill or fill soil material on surfaces that are muddy, frozen, or contain frost or ice.

2. Remove and replace or scarify and air dry otherwise satisfactory soil material that exceeds optimum moisture content by 2 percent and is too wet to compact to specified dry unit weight.

3.15. COMPACTION OF SOIL BACKFILLS AND FILLS

A. Place backfill and fill soil materials in layers not more than 200 mm in loose depth for material compacted by heavy compaction equipment, and not more than 100 mm in loose depth for material compacted by hand-operated tampers.

B. Place backfill and fill soil materials evenly on all sides of structures to required elevations, and uniformly along the full length of each structure.

C. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 1557:

1. Under structures, building slabs, steps, and pavements, scarify and recompact top 300mm of existing subgrade and each layer of backfill or fill soil material at 98%

2. Under walkways, scarify and recompact top 150 mm below subgrade and compact each layer of backfill or fill soil material at 95%

3. Under lawn or unpaved areas, scarify and recompact top 150 mm below subgrade and compact each layer of backfill or fill soil material at 85%

4. For utility trenches, compact each layer of initial and final backfill soil material at 85%

3.16. GRADING

A. General: Uniformly grade areas to a smooth surface, free of irregular surface changes. Comply with compaction requirements and grade to cross sections, lines, and elevations indicated.

1. Provide a smooth transition between adjacent existing grades and new grades.

2. Cut out soft spots, fill low spots, and trim high spots to comply with required surface tolerances.

B. Site Grading: Slope grades to direct water away from buildings and to prevent ponding. Finish subgrades to required elevations within the following tolerances:

1. Lawn or Unpaved Areas: Plus or minus 25 mm.

2. Walks: Plus, or minus 25 mm.

3. Pavements: Plus, or minus 12 mm.

C. Grading inside Building Lines: Finish subgrade to a tolerance of 12 mm when tested with a 3.00 m straightedge.

3.17. SUBSURFACE DRAINAGE

A. Subsurface Drain: Place subsurface drainage geotextile around perimeter of subdrainage trench.

Place a 150 mm course of filter material on subsurface drainage geotextile to support subdrainage

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

pipe. Encase subdrainage pipe in a minimum of 300 mm of filter material, placed in compacted layers 150 mm thick, and wrap in subsurface drainage geotextile, overlapping sides and ends at least 150 mm.

Compact each filter material layer with a minimum of two passes of a plate-type vibratory compactor].

B. Drainage Backfill: Place and compact filter material over subsurface drain, in width indicated, to within 300 mm of final subgrade, in compacted layers 150 mm thick. Overlay drainage backfill with 1 layer of subsurface drainage geotextile, overlapping sides and ends at least 150mm.

1. Compact each filter material layer with a minimum of two passes of a plate-type vibratory compactor.

2. Place and compact impervious fill over drainage backfill in 150 mm thick compacted layers to final subgrade.

3.18. SUBBASE AND BASE COURSES

A. Place subbase and base course on subgrades free of mud, frost, snow, or ice.

B. On prepared subgrade, place subbase and base course under pavements and walks as follows:

1. Install separation geotextile on prepared subgrade according to manufacturer's written instructions, overlapping sides and ends.

2. Place base course material over subbase course under hot-mix asphalt pavement.

3. Shape subbase and base course to required crown elevations and cross-slope grades.

4. Place subbase and base course 150 mm or less in compacted thickness in a single layer.

5. Place subbase and base course that exceeds 150 mm in compacted thickness in layers of equal thickness, with no compacted layer more than 150 mm thick or less than 75 mm thick.

6. Compact subbase and base course at optimum moisture content to required grades, lines, cross sections, and thickness to not less than 95 percent of maximum dry unit weight according to

ASTM D 1557.

C. Pavement Shoulders: Place shoulders along edges of subbase and base course to prevent lateral movement. Construct shoulders, at least 300 mm wide, of satisfactory soil materials and compact simultaneously with each subbase and base layer to not less than 95 percent of maximum dry unit weight according to ASTM D 1557.

3.19. DRAINAGE COURSE

Place drainage course on subgrades free of mud, frost, snow, or ice.

3.20. FIELD QUALITY CONTROL

A. Testing Agency: The Contractor will engage a qualified independent geotechnical engineering testing agency to perform field quality-control testing.

B. Allow testing agency to inspect and test subgrades and each fill or backfill layer. Proceed with subsequent earthwork only after test results for previously completed work comply with requirements.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

C. Testing agency will test compaction of soils in place according to ASTM D 1556, ASTM D

2167, ASTM D 2922, and ASTM D 2937, as applicable. Tests will be performed at the following locations and frequencies:

1. Paved and Building Slab Areas: At subgrade and at each compacted fill and backfill layer, at least 1 test for every 200 m2 or less of paved area or building slab, but in no case fewer than 3 tests.

2. Foundation Wall Backfill: At each compacted backfill layer, at least 1 test for each 30.00m or less of wall length, but no fewer than 2 tests.

3. Trench Backfill: At each compacted initial and final backfill layer, at least 1 test for each

50.00 m or less of trench length, but no fewer than 2 tests.

D. When testing agency reports that subgrades, fills, or backfills have not achieved degree of compaction specified, scarify and moisten or aerate, or remove and replace soil to depth required; recompact and retest until specified compaction is obtained.

3.21. PROTECTION

A. Protecting Graded Areas: Protect newly graded areas from traffic, freezing, and erosion. Keep free of trash and debris.

B. Repair and reestablish grades to specified tolerances where completed or partially completed surfaces become eroded, rutted, settled, or where the compaction is lost due to subsequent construction operations or weather conditions.

Scarify or remove and replace soil material to depth as directed by COR; reshape and recompact.

C. Where settling occurs before Project correction period elapses, remove finished surfacing, backfill with additional soil material, compact, and reconstruct surfacing.

Restore appearance, quality, and condition of finished surfacing to match adjacent work, and eliminate evidence of restoration to greatest extent possible.

3.22. DISPOSAL OF SURPLUS AND WASTE MATERIALS

A. Disposal: Remove surplus satisfactory soil and waste material, including unsatisfactory soil, trash, and debris, and legally dispose of it off Government's property.

B. Disposal: Transport surplus satisfactory soil to designated storage areas on Government's property. Stockpile or spread soil as directed by COR.

Remove waste material, including unsatisfactory soil, trash, and debris, and legally dispose of it off Government's property.

END OF SECTION 02300

SECTION 02751 - CEMENT CONCRETE PAVEMENT

A. This Section includes exterior cement concrete pavement for the following:

1. Driveways and roadways.

2. Parking lots.

3. Curbs and gutters.

4. Walkways.

B. Related Sections include the following:

1. Division 2 Section "Earthwork" for subgrade preparation, grading, and subbase course.

2. Division 2 Section "Pavement Joint Sealants" for joint sealants within concrete pavement and at isolation joints of concrete pavement with adjacent construction.

1.2. DEFINITIONS

Cementitious Materials: Portland cement alone or in combination with one or more of blended hydraulic cement, expansive hydraulic cement, fly ash and other pozzolans, ground granulated blast-furnace slag, and silica fume.

1.3. SUBMITTALS

A. Product Data: For each type of manufactured material and product indicated.

B. Design Mixtures: For each concrete pavement mixture. Include alternate mixture designs when characteristics of materials, Project conditions, weather, test results, or other circumstances warrant adjustments.

C. Samples: 4.5-kg sample of exposed aggregate.

D. Qualification Data: For manufacturer.

E. Material Test Reports: From a qualified testing agency indicating and interpreting test results for compliance of the following with requirements indicated, based on comprehensive testing of current materials:

Aggregates

Material Certificates: Signed by manufacturers certifying that each of the following materials complies with requirements:

1. Cementitious materials.

2. Steel reinforcement and reinforcement accessories.

3. Fiber reinforcement.

4. Admixtures.

5. Curing compounds.

6. Applied finish materials.

7. Bonding agent or epoxy adhesive.

8. Joint fillers.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

F. Field quality-control test reports.

G. Minutes of preinstallation conference.

1.4. QUALITY ASSURANCE

A. Installer Qualifications: An experienced installer who has completed pavement work similar in material, design, and extent to that indicated for this Project and whose work has resulted in construction with a record of successful in-service performance.

B. Manufacturer Qualifications: Manufacturer of ready-mixed concrete products complying with

ASTM C 94 requirements for production facilities and equipment.

Manufacturer must be certified according to the National Ready-Mix Concrete Association's

Plant Certification Program or equivalent.

C. Testing Agency Qualifications: An independent agency qualified according to ASTM C 1077 and

ASTM E 329 for testing indicated, as documented according to ASTM E 548.

Personnel conducting field tests shall be qualified as ACI Concrete Field-Testing Technician, Grade 1, according to ACI CP-01 or an equivalent certification program.

D. Source Limitations: Obtain each type or class of cementitious material of the same brand from the same manufacturer's plant and each aggregate from one source.

E. ACI Publications: Comply with ACI 301, "Specification for Structural Concrete," unless modified by the requirements of the Contract Documents.

F. Concrete Testing Service: Engage a qualified independent testing agency to perform material evaluation tests and to design concrete mixes.

G. Mockups: Cast mockups of full-size sections of concrete pavement to demonstrate typical joints, surface finish, texture, color, and standard of workmanship.

1. Build mockups in the location and of the size indicated or, if not indicated, as directed by COR.

2. Notify COR seven days in advance of dates and times when mockups will be constructed.

3. Obtain COR's approval of mockups before starting construction.

4. Maintain approved mockups during construction in an undisturbed condition as a standard for judging the completed pavement.

5. Demolish and remove approved mockups from the site when directed by COR.

6. Approved mockups may become part of the completed Work if undisturbed at time of

Substantial Completion.

H. Preinstallation Conference: Conduct conference at Project site

Before submitting design mixes, review concrete pavement mix design and examine procedures for ensuring quality of concrete materials. Require representatives of each entity directly concerned with concrete pavement to attend, including the following:

1. Contractor's superintendent.

2. Independent testing agency responsible for concrete design mixes.

3. Ready-mix concrete producer.

4. Concrete subcontractor.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

I. Document any applicable local codes or authorities and ensure that all relevant work is in compliance.

Traffic Control: Maintain access for vehicular and pedestrian traffic as required for other construction activities.

2. PART 2 – PRODUCTS

2.1. FORMS

A. Form Materials: Plywood, metal, metal-framed plywood, or other approved panel-type materials to provide full-depth, continuous, straight, smooth exposed surfaces.

Use flexible or curved forms for curves of a radius 30 m or less.

B. Form-Release Agent: Commercially formulated form-release agent that will not bond with, stain, or adversely affect concrete surfaces and will not impair subsequent treatments of concrete surfaces.

2.2. STEEL REINFORCEMENT

A. Plain-Steel Welded Wire Fabric: ASTM A 185, fabricated from as-drawn steel wire into flat sheets.

B. Deformed-Steel Welded Wire Fabric: ASTM A 497, flat sheet.

C. Epoxy-Coated Welded Wire Fabric: ASTM A 884/A 884M, Class A, plain steel.

D. Reinforcement Bars: ASTM A 615/A 615M, Grade 420, deformed.

E. Galvanized Reinforcing Bars: ASTM A 767/A 767M, Class II zinc coated, hot-dip galvanized after fabrication and bending; with ASTM A 615/A 615M, Grade 420 (Grade 60) deformed bars.

F. Epoxy-Coated Reinforcement Bars: ASTM A 775/A 775M; with ASTM A 615/A 615M, Grade

420, deformed bars.

G. Steel Bar Mats: ASTM A 184/A 184M; with ASTM A 615/A 615M, Grade 420, deformed bars;

assembled with clips.

H. Plain Steel Wire: ASTM A 82, as drawn.

I. Epoxy-Coated Wire: ASTM A 884/A 884M, Class A coated, plain steel.

J. Joint Dowel Bars: Plain steel bars, ASTM A 615/A 615M, Grade 420. Cut bars true to length with ends square and free of burrs.

UNITED STATES DEPARTMENT OF STATE DECEMBER 2023

STANDARD SPECIFICATIONS FOR PARKING EXPANSION

K. Epoxy-Coated Joint Dowel Bars: ASTM A 775/A 775M; with ASTM A 615/A 615M, Grade

420, plain steel bars.

L. Tie Bars: ASTM A 615/A 615M, Grade 420, deformed.

M. Hook Bolts: ASTM F 568M, Property Class 4.6, internally and externally threaded. Design hook-bolt joint assembly to hold coupling against pavement form and in position during concreting operations, and to permit removal without damage to concrete or hook bolt.

N. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcement bars, welded wire fabric, and dowels in place. Manufacture bar supports according to CRSI's "Manual of Standard Practice" from steel wire, plastic, or precast concrete or fiber-reinforced concrete of greater compressive strength than concrete, and as follows:

1. Equip wire bar supports with sand plates or horizontal runners…