Rexford Bench Compiled Specs.DOC

SECTION 01010 - SUMMARY OF WORK

PART 1 - GENERAL

1.1 - DESCRIPTION OF WORK

A.

This project includes selective demolition and reconstruction of multiple toilet buildings at the Rexford Bench Campground. There are three toilets with one additional toilet as an additive bid item. The additive item will be awarded if funding is available.

1.2 - PROJECT LOCATION

A. The project site is approximately 7 miles west of Eureka, MT and 0.5 miles east of Rexford, MT along State Highway 37. Signs to the Rexford Bench Campground are located along Hwy 37. The toilet buildings can be found by using the map included in the drawings.

1.3 - PROSECUTION AND PROGRESS

A. The estimated start work date is Mar 1, 2010.

B.

Prior to start work a prework conference will be held.

C. All work under this contract to be completed by May 1, 2012.

D.

Submittals: The Contractor shall submit the following at the prework conference.

1.

Submit a plan of operations and progress schedule, including an outline of how the project is to be completed.

2.

Additional submittal requirements are in the individual sections of these specifications.

E.

Weekend and Holiday Work Restrictions: No on-site work shall be performed on weekends or federal holidays unless otherwise authorized be the CO.

F.

Because the work under this contract will be performed in an open campground there are some special considerations regarding the timing of the work.

1.

When the campground is closed for the season, September 15 thru April 30, work may be performed on all toilets simultaneously, provided the toilets will be completed by the start of the next camping season. There are no restrictions regarding the hours of operation during this time period.

2.

While the campground is open, May 1 thru September 14, the contractor will be allowed to work on only one toilet at a time and all work must be completed on that toilet in order to begin working on another toilet. Work will be restricted to the hours of 8 am. to 6 pm daily. During this season, the electrical components in Toilet #4 that control the lift station pumps must remain in an operable condition.

1.4 – CODES, STANDARDS, AND PERMITS

A.

Comply with these specifications, project drawings, and all applicable local, State, and National laws, codes, standards, and regulations. Comply with all health and safety codes for personnel and public.

1.5 – PRE-BID CONFERENCE AND TOUR

A. No pre-bid conference or tour will be conducted. Prospective quoters are encouraged to visit the site prior to quoting. One of the toilets has already been reconstructed in a manner very similar to the work under this contract. It would be a good representation of the desired finished product. Contact Eric Heyn (Rexford Ranger District Recreation Manager) at (406) 296-2536 to arrange for a site visit.

1.6 – USE OF PREMISES

A. Toilet facilities are available at the work site while the campground is open. The existing vault toilet near Toilet 4 is available. The contractor is responsible for providing any additional toilet facilities for those people working on this project. Place portable toilets in locations approved by the CO.

B. Electrical power is available at the worksite.

C. Water is available at the worksite only when the campground is open (May 1 thru Sept. 14).

D.

The Contractor will be allowed to camp at the worksite during periods of active work.

1.

One campsite will be set aside for this purpose and must be arranged ahead of time. The contractor should notify the CO at the prework conference if they intend to camp at the site.

E.

The Contractor shall park his vehicles in a manner that will not interfere with other road users. Vehicles shall not be permitted off parking area and/or driving lane, unless approved by the Contracting Officer.

F. The Contractor may store materials in areas approved by the Contracting Officer. The Contractor shall be responsible for materials and equipment stored at the site.

G.

The Contractor shall maintain the project area in a neat, orderly, and safe condition at all times. All construction debris to be cleaned up at the end of each working day and placed in suitable containers.

1.7 - PROTECTION OF PROPERTY

A.

Under ground utilities – Locate underground utilities prior to excavation. Contractor is responsible for utility location.

B.

Protection of Existing Improvements:

1.

Provide protections necessary to prevent damage to existing improvements indicated to remain in place or designated for salvage.

2.

Protect improvements on adjoining properties and on Government property.

3.

Restore damaged improvements to their original condition at contractor’s expense, as acceptable to the C.O.

C.

Protection of Existing Trees and Vegetation:

1.

Operate equipment only in the areas immediately adjacent to the related work.

2.

Protect existing trees and other vegetation designated to remain in place against cutting, breaking, or skinning of roots, skinning and bruising of bark, smothering of trees by stockpiling construction materials or excavated materials, excess foot or vehicular traffic, or parking of vehicles.

3.

Where any trees are damaged or where limbs are required to be trimmed or removed because of operations under this contract or because of interference with new construction, any cutting or removal of limbs or branches shall be done only with prior approval of the C.O..

D.

Protection of Existing Site:

1.

Solvents, oils, and other material which may be harmful to plant life shall be disposed of in containers and removed from the site. At the completion of the work, any contaminated soil shall be removed from National Forest Land and replaced with topsoil.

1.8

WEED PREVENTION AND CLEANING EQUIPMENT

A.

This work consists of washing and treating construction equipment and vehicles necessary for equipment transport to remove seeds, plants, and plant fragments before the equipment is used on Forest Service lands.

B.

Wash the sides, tops, and undercarriages of all construction equipment. Remove all seeds, plants, plant fragments, dirt, and debris from the construction equipment. Only equipment inspected by the Forest Service will be allowed to operate within the project area. All subsequent move-ins of equipment to the project area will be treated in the same manner as the initial move-in. This requirement does not apply to cars, pickup trucks, and other vehicles that regularly travel between the construction site and areas off the National Forest.

C.

Equipment will be considered free of soil, seed, and other such debris when a visual inspection does not disclose such material. Disassembly of equipment, components or the need for specialized inspection tools is not required.

D.

Notify the CO in writing at least 24 hours before moving any construction equipment onto the national forest. Notification will include an agreed upon location where the equipment will be available for inspection by the Forest Service. Inspection will be required after every cleaning.

E.

Use methods of cleaning and locations for cleaning approved by the C.O.

F.

For work at a commercial washing facility, use an approved facility.

G. New infestations of noxious weeds of concern to Forest Service and identified by either Contractor or Forest Service, on the Project Area or on the haul route, will be promptly reported to the other party. Contractor and Forest Service will agree on treatment methods to reduce or stop the spread of noxious weeds when new infestations are found. A current list of noxious weeds of concern to Forest Service is available at each Forest Service office.

1.8 – MEASUREMENT AND PAYMENT

A.

There will be no separate pay item for mobilization (including equipment washing). Mobilization will be considered incidental to the work items in this contract.

END OF SECTION

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SECTION 01731 - CUTTING AND PATCHING

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes procedural requirements for cutting and patching.

B. See Divisions 2 through 16 Sections for specific requirements and limitations applicable to cutting and patching individual parts of the Work.

1.2 SUBMITTALS

A. Cutting and Patching Proposal: Submit a proposal describing procedures at least two weeks before the time cutting and patching will be performed, requesting approval to proceed. Include the following information:

1. Extent: Describe cutting and patching, show how they will be performed.

2. Changes to In-Place Construction: Describe anticipated results. Include changes to structural elements and operating components as well as changes in building's appearance and other significant visual elements.

3. Dates: Indicate when cutting and patching will be performed.

Delete subparagraph below if utility services or mechanical/electrical systems are not affected by cutting and patching. Revise to suit Project.

4. Utility Services and Mechanical/Electrical Systems: List services/systems that cutting and patching procedures will disturb or affect. List services/systems that will be relocated and those that will be temporarily out of service. Indicate how long services/systems will be disrupted.

5. Changes: Any anticipated deviations from the drawings.

First subparagraph below shifts responsibility for cutting and patching structural work from Architect to Contractor. Revise to suit Project and local regulations. Be careful not to violate state laws or public policy, which may require Structural Engineer to take responsibility.

1.3 QUALITY ASSURANCE

This Article contains requirements that expand provisions contained in AIA Document A201.

A. Structural Elements: Do not cut and patch structural elements in a manner that could change load-carrying capacity or load-deflection ratio of the structure. Contractor shall notify CO immediately if he determines that demolition work will damage the structure.

B. Visual Requirements: Do not cut and patch construction in a manner that results in visual evidence of cutting and patching. Do not cut and patch construction exposed on the exterior or in occupied spaces in a manner that would reduce the building's aesthetic qualities. Remove and replace construction that has been cut and patched in a visually unsatisfactory manner.

PART 2 - PRODUCTS

2.1 MATERIALS

A. General: Comply with requirements specified in other Sections.

B. In-Place Materials: Use materials identical to in-place materials. For exposed surfaces, use materials that visually match in-place adjacent surfaces to the fullest extent possible.

1.

Contractor may reuse demolished reverse board and batten siding where whole, undamaged lengths are available. The Contractor must obtain the Contracting Officer’s written permission to reuse siding.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine surfaces to be cut and patched and conditions under which cutting and patching are to be performed.

3.2 PREPARATION

A. Temporary Support: Provide temporary support of Work to be cut.

B. Protection: Protect construction to remain during cutting and patching to prevent damage. Provide building interior with protection from adverse weather conditions for portions of Project that might be exposed during cutting and patching operations.

Retain paragraph below where Owner continues to occupy other portions of an existing facility.

3.3 PERFORMANCE

A. General: Employ skilled workers to perform cutting and patching.

1. Cut in-place construction to provide for installation of other components or performance of other construction, and subsequently patch as required to restore surfaces to their original condition.

B. Cutting: Cut in-place construction by sawing, drilling, breaking, chipping, grinding, and similar operations, including excavation, using methods least likely to damage elements retained or adjoining construction.

1. In general, use hand or small power tools designed for sawing and grinding, not hammering and chopping. Cut holes and slots as small as possible, neatly to size required, and with minimum disturbance of adjacent surfaces. Temporarily cover openings when not in use.

2. Finished Surfaces: Cut or drill from the exposed or finished side into concealed surfaces.

3. Concrete: Cut using a cutting machine, such as an abrasive saw.

4. Excavating and Backfilling: Comply with requirements in applicable Division 2 Sections where required by cutting and patching operations.

Revise subparagraph below to suit Project.

5. Mechanical and Electrical Services: Cut off pipe or conduit in walls or partitions to be removed. Cap, valve, or plug and seal remaining portion of pipe or conduit to prevent entrance of moisture or other foreign matter after cutting.

Retain subparagraph below if required to prevent multiple cutting and patching in the same area. Add specific requirements for multiple contracts and special conditions requiring coordination.

6. Proceed with patching after construction operations requiring cutting are complete.

C. Patching: Patch construction by filling, repairing, refinishing, closing up, and similar operations following performance of other Work. Patch with durable seams that are as invisible as possible. Provide materials and comply with installation requirements specified in other Sections.

1. Inspection: Where feasible, test and inspect patched areas after completion to demonstrate integrity of installation.

2. Exposed Finishes: Restore exposed finishes of patched areas and extend finish restoration into retained adjoining construction in a manner that will eliminate evidence of patching and refinishing.

Insert specific refinishing requirements for floors, walls, and ceilings. Revise three subparagraphs below to suit Project.

3. Floors and Walls: Where walls or partitions that are removed extend one finished area into another, patch and repair floor and wall surfaces in the new space. Provide an even surface of uniform finish, color, texture, and appearance. Remove in-place floor and wall coverings and replace with new materials.

4. Ceilings: Patch and repair in-place ceilings as necessary to provide an even-plane surface of uniform appearance.

5. Exterior Building Enclosure: Patch components in a manner that restores enclosure to a weathertight condition.

D. Cleaning: Clean areas and spaces where cutting and patching are performed.

END OF SECTION 01731

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SECTION 01732 - SELECTIVE DEMOLITION

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 4 - GENERAL

4.1 SUMMARY

A. This Section includes the following:

Adjust list below to suit Project.

1. Demolition and removal of selected portions of building or structure.

2. Salvage of existing items to be reused

B. See Division 2 Section "Site Clearing" for site clearing and removal of above- and below-grade improvements.

4.2 DEFINITIONS

A. Remove: Detach items from existing construction and legally dispose of them off-site, unless indicated to be removed and reinstalled or returned to the Government.

B. Remove and Reinstall: Detach items from existing construction, prepare them for reuse, and reinstall them where indicated.

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

4.3 SUBMITTALS

A. Schedule of Selective Demolition Activities: Indicate sequence of selective demolition and removal work and interruption of utility services.

B. Provide the CO with a copy of the condition inventory of items to be removed and reinstalled and items to be returned to the Government.

4.4 QUALITY ASSURANCE

A. Regulatory Requirements: Comply with governing EPA notification regulations before beginning selective demolition. Comply with hauling and disposal regulations of the State of Montana.

B. Standards: Comply with ANSI A10.6 and NFPA 241.

4.5 PROJECT CONDITIONS

A. Government will occupy portions of site adjacent to selective demolition area. Conduct selective demolition so Government's operations will not be disrupted.

B. Conditions existing at time of inspection for bidding purposes will be maintained by Government as far as practical.

C. Notify CO of discrepancies between existing conditions and Drawings in writing before proceeding with selective demolition.

Retain one of first three paragraphs and associated subparagraphs below, or remove all references to asbestos. Expand scope of this Article to include PCBs or other materials if required. Coordinate statements with the General and Supplementary Conditions.

D. Hazardous Materials: It is not expected that hazardous materials will be encountered in the Work.

1. If materials suspected of containing hazardous materials are encountered, do not disturb; immediately notify CO in writing prior to proceeding with the work.

E. Storage or sale of removed items or materials on-site is not permitted except for those to be reused or returned to the Government. The Contractor shall store these items under a weatherproof cover.

F. Utility Service: Maintain existing site utilities and protect them against damage during selective demolition operations.

PART 5 - PRODUCTS (Not Used)

PART 6 - EXECUTION

6.1 EXAMINATION

A. Verify that utilities have been disconnected and capped.

B. Survey existing conditions and correlate with requirements indicated to determine extent of selective demolition required.

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

D. When unanticipated mechanical, electrical, or structural elements that conflict with intended function or design are encountered, investigate and measure the nature and extent of conflict. Promptly submit a written report to CO.

Usually retain first paragraph below. OSHA regulations require an engineering survey before selective demolition begins.

6.2 UTILITY SERVICES AND MECHANICAL/ELECTRICAL SYSTEMS

A. Existing Services/Systems: Maintain services/systems indicated to remain and protect them against damage during selective demolition operations.

B. Service/System Requirements: Locate, identify, disconnect, and seal or cap off indicated utility services and mechanical/electrical systems serving areas to be selectively demolished.

1. Cut off pipe or conduit in walls or partitions to be removed. Cap, valve, or plug and seal remaining portion of pipe or conduit after bypassing.

6.3 PREPARATION

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

Revise paragraph and subparagraph above and first paragraph below to suit Project. Delete all if adequately covered in Division 1 Section "Temporary Facilities and Controls."

B. Temporary Facilities: Provide temporary barricades and signs required to prevent access to the facility during construction.

6.4 SELECTIVE DEMOLITION

A. General: Demolish and remove existing construction only to the extent required by new construction and as indicated. Use methods required to complete the Work within limitations of governing regulations and as follows:

1. Neatly cut openings and holes plumb, square, and true to dimensions required. Use cutting methods least likely to damage construction to remain or adjoining construction. Use hand tools or small power tools designed for sawing or grinding, not hammering and chopping, to minimize disturbance of adjacent surfaces. Temporarily cover openings to remain.

2. Cut or drill from the exposed or finished side into concealed surfaces to avoid marring existing finished surfaces.

3. Dispose of demolished items and materials promptly.

B. Do not demolish building elements beyond what is indicated on Drawings without CO's approval.

First option in first subparagraph below is requirement for LEED Credit MR 1.1; second option is for Credit MR 1.2. Second subparagraph is for Credit MR 1.3.

C. Removed and Reinstalled Items:

1. Clean and repair items to functional condition adequate for intended reuse.

2. Protect items from damage during storage.

3. Reinstall items in locations indicated. Comply with installation requirements for new materials and equipment. Provide connections, supports, and miscellaneous materials necessary to make item functional for use indicated.

D. Existing Items to Remain: Protect construction indicated to remain against damage and soiling during selective demolition.

6.5 DISPOSAL OF DEMOLISHED MATERIALS

A. General: Except for items or materials indicated to be reused, salvaged, or reinstalled, remove demolished materials from Project site and legally dispose of them in an EPA-approved landfill.

B. Burning: Do not burn demolished materials.

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

6.6 CLEANING

A. Clean adjacent structures and improvements of dust, dirt, and debris caused by selective demolition operations. Return adjacent areas to condition existing before selective demolition operations began.

END OF SECTION 01732

MASTERSPEC Short Form Copyright 2001 by The American Institute of Architects (AIA)

Exclusively published and distributed by Architectural Computer Services, Inc (ARCOM) for the AIA

SECTION 02230 - SITE CLEARING

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 7 - GENERAL

7.1 SUMMARY

A. This Section includes the following:

Adjust list below to suit Project.

1. Protecting existing trees to remain.

2. Clearing and grubbing.

3. Removing above- and below-grade site improvements.

4. Temporary erosion and sedimentation control measures.

7.2 MATERIAL OWNERSHIP

A. Cleared materials shall become Contractor's property and shall be removed from Project site.

7.3 PROJECT CONDITIONS

A. Traffic: Minimize interference with adjoining roads and other adjacent occupied facilities during site-clearing operations.

1. Do not close or obstruct streets without written permission from CO.

Delete first paragraph below if not applicable. Indicate items to be salvaged on Drawings or in schedules.

B. Utility Locator Service: Notify utility locator service for area where Project is located before site clearing.

C. Do not commence site clearing operations until temporary erosion and sedimentation control measures are in place.

PART 8 - PRODUCTS (Not Applicable)

Retain "(Not Applicable)" above and delete "Soil Materials" Article below when soil backfill is not required in below-grade areas after demolition. Add other materials to suit Project.

8.1 SOIL MATERIALS

A. Satisfactory Soil Materials: Requirements for satisfactory soil materials are specified in Division 2 Section "Earthwork."

PART 9 - EXECUTION

9.1 PREPARATION

A. Protect and maintain benchmarks and survey control points from disturbance during construction.

B. Protect existing site improvements to remain from damage during construction.

1. Restore damaged improvements to their original condition, as acceptable to CO.

9.2 TEMPORARY EROSION AND SEDIMENTATION CONTROL

Delete this Article if erosion and sedimentation control measures are included in Division 1 "Temporary Facilities and Controls."

Select second option in first paragraph below to comply with LEED Prerequisite SS 1 if sediment and erosion control plan is included in the Contract Documents; select third option if Contractor is required to provide sediment and erosion control plan to comply with LEED Prerequisite SS 1.

A. Provide temporary erosion and sedimentation control measures to prevent soil erosion and discharge of soil-bearing water runoff or airborne dust.

B. Inspect, repair, and maintain erosion and sedimentation control measures during construction.

C. Remove erosion and sedimentation controls and restore and stabilize areas disturbed during removal.

9.3 TREE PROTECTION

A.

Repair or replace trees that are damaged by construction operations.

9.4 CLEARING AND GRUBBING

Delete this Article if not required. Coordinate with Division 2 Section "Earthwork."

A. Fill depressions caused by clearing and grubbing operations with satisfactory soil material.

1. Place fill material in horizontal layers not exceeding a loose depth of 8 inches (200 mm), and compact each layer to a density equal to adjacent original ground.

9.5 SITE IMPROVEMENTS

Revise paragraph below and add specific items to suit Project.

A. Remove existing asphalt walkway as necessary to facilitate new construction.

9.6 DISPOSAL

A. Disposal: Remove surplus soil material, demolished materials, and waste materials including trash and debris, and legally dispose of them off Government property.

Retain subparagraph below where recycling programs exist and recycling facilities can accept materials such as concrete or asphalt paving.

END OF SECTION 02230

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SECTION 02300 - EARTHWORK

This Section uses the term "Architect." Change this term to match that used to identify the design professional as defined in the General and Supplementary Conditions.

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 10 - GENERAL

10.1 SUMMARY

A. This Section includes the following:

Adjust list below to suit Project.

1. Preparing subgrades for slabs-on-grade and walks.

2. Excavating and backfilling.

3. Drainage course for slabs-on-grade.

4. Subbase course for concrete walks.

5. Excavating and backfilling for utility trenches.

10.2 DEFINITIONS

Retain definitions that remain after this Section has been edited. Revise to suit office or local earthwork practices.

A. Backfill: Soil 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. Bedding Course: Course placed over the excavated subgrade in a trench before laying pipe.

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

Revise heading in first paragraph below to read "Capillary Water Barrier" or a similar title if required.

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

E. 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 CO. Authorized additional excavation and replacement material will be paid for according to Contract provisions Changes in the Work.

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

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

G. Structures: Buildings, footings, slabs, mechanical and electrical appurtenances, or other man-made stationary features constructed above or below the ground surface.

H. Subbase Course: Course placed between the subgrade and a cement concrete walk.

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

J. Utilities: Underground service pipes within buildings.

10.3 PROJECT CONDITIONS

Delete this Article if no existing utilities.

A. Existing Utilities: Do not interrupt utilities serving facilities occupied by Government or others unless permitted in writing by CO and then only after arranging to provide temporary utility services as directed by the CO.

PART 11 - PRODUCTS

11.1 SOIL MATERIALS

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

Revise two paragraphs and associated subparagraph below and identify soil materials according to geotechnical engineer's written recommendations. Revise soil groups and size of stone to suit Project. Add liquid limit and plasticity index if further qualifying satisfactory soil groups. Most soils are classified according to ASTM D 2487. Heavy civil or highway projects may use AASHTO M 145.

B. Satisfactory Soils: ASTM D 2487 Soil Classification Groups GW, GP, GM, SW, SP, and SM, or a combination of these groups; free of rock or gravel larger than 3 inches (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, or a combination of these groups.

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

Terms, descriptions, and gradations of granular soil materials in paragraphs below are examples only. Revise to comply with local practices and to suit Project. For example, granular materials may be referenced by state or local highway designations rather than by ASTM classifications.

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 1-1/2-inch (37.5-mm) sieve and not more than 12 percent passing a No. 200 (0.075-mm) sieve. Obtain subbase material from a commercial source.

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 1-1/2-inch (37.5-mm) sieve and not more than 12 percent passing a No. 200 (0.075-mm) sieve. Obtain engineered fill from a commercial source.

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 No. 200 (0.075-mm) sieve. Obtain bedding course from a commercial source.

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 1-1/2-inch (37.5-mm) sieve and 0 to 5 percent passing a No. 8 (2.36-mm) sieve. Obtain drainage course from a commercial source.

Delete warning tapes in this Article if not required. Use may be mandatory for underground hazardous utilities.

PART 12 - EXECUTION

12.1 PREPARATION

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

B. Preparation of subgrade for earthwork operations including removal of vegetation, topsoil, debris, obstructions, and deleterious materials from ground surface is specified in Division 2 Section "Site Clearing."

C. Protect and maintain erosion and sedimentation controls, which are specified in Division 2 Section "Site Clearing," during earthwork operations.

12.2 EXCAVATION

Retain paragraph and subparagraph below if excavation is unclassified and no changes in the Contract Sum or the Contract Time will be authorized for rock excavation.

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.

12.3 EXCAVATION FOR STRUCTURES

Revise tolerances in this Article to suit office practice if applicable.

A. Excavate to indicated elevations and dimensions within a tolerance of plus or minus 1 inch (25 mm). If applicable, extend excavations a sufficient distance from structures for placing and removing concrete formwork, for installing other construction, and for inspections.

Revise subparagraph below if footings and foundations are placed on engineered fill.

1. Excavations for Footings: 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.

12.4 EXCAVATION FOR WALKS AND PAVEMENTS

A. Excavate surfaces under walks to indicated lines, elevations, and subgrades.

12.5 EXCAVATION FOR UTILITY TRENCHES

Revise this Article to suit Project. Coordinate with utility Sections in other Divisions.

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

B. Excavate trenches to uniform widths to provide the following clearance. Excavate trench walls vertically from trench bottom to 12 inches (300 mm) higher than top of pipe.

Retain, revise, or delete subparagraph below to suit Project.

1. Clearance: 12 inches (300 mm) around pipe.

Revise paragraph and subparagraph below to suit Project, requirements of authorities having jurisdiction, type of pipe or conduit, and manufacturer's installation requirements.

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 joints and barrels of pipes. Remove projecting stones and sharp objects along trench subgrade.

1. Excavate trenches 6 inches (150 mm) deeper than elevation required in rock or other unyielding bearing material, 4 inches (100 mm) deeper elsewhere, to allow for bedding course.

12.6 SUBGRADE INSPECTION

Revise locations for proof-rolling in paragraph below if required.

A. Proof-roll subgrade below the building slabs to identify soft pockets and areas of excess yielding. Do not proof-roll wet or saturated subgrades.

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

12.7 UNAUTHORIZED EXCAVATION

Revise this Article to suit Project.

A. Fill unauthorized excavation under wall footings by extending bottom elevation of concrete footing to excavation bottom, without altering top elevation. Lean concrete fill, with 28-day compressive strength of 2500 psi (17.2 MPa), may be used when approved by CO.

1. Fill unauthorized excavations under other construction as directed by CO.

12.8 STORAGE OF SOIL MATERIALS

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

1. Stockpile soil materials away from edge of excavations.

12.9 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 joints and barrels of pipes.

Revise dimensions or extent of concrete backfill in first paragraph below to suit Project.

C. Backfill trenches excavated under footings and within 18 inches (450 mm) of bottom of footings with satisfactory soil; fill with concrete to elevation of bottom of footings. Concrete is specified in Division 3 Section "Cast-in-Place Concrete."

D. Place and compact initial backfill of satisfactory soil, free of particles larger than 1 inch (25 mm) in any dimension, to a height of 12 inches (300 mm) over the utility pipe.

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

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

Revise tape depths in paragraph below to suit office practice if applicable.

12.10 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:

Delete subparagraphs below not required. Revise soil materials to suit Project. Other soil materials, such as a drainage course or subbase or base courses, may still be required over fill.

1. Under walks, use satisfactory soil material.

2. Under building slabs, use engineered fill.

Retain subparagraph below if backfill or fill beneath footings and foundations is required. Coordinate material selection with geotechnical engineer's written recommendations.

3. Under footings, use engineered fill.

4. On the edge of walks, use satisfactory soil material

5. Toilet #5, areas adjacent to the building where the changing room slab was removed, use satisfactory soil material.

12.11 SOIL MOISTURE CONTROL

Revise percentage in paragraph and second subparagraph below according to geotechnical engineer's written recommendations.

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.

12.12 COMPACTION OF SOIL BACKFILLS AND FILLS

Revise depth of layers in first paragraph below to suit Project.

A. Place backfill and fill soil materials in layers not more than 8 inches (200 mm) in loose depth for material compacted by heavy compaction equipment, and not more than 4 inches (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.

Select option in paragraph below based on ASTM test method required. Replace the term "unit weight" with "density" if preferred.

C. Compact soil materials to not less than the following percentages of maximum dry unit weight according to ASTM D 698:

Retain applicable subparagraphs below. Percentages of maximum dry unit weight are examples only; revise to suit Project. Delete scarifying and recompacting existing subgrade when proof-rolling will suffice.

1. Under structures and building slabs recompact top 12 inches (300 mm) each layer of backfill or fill soil material at 95 percent.

2. Under walkways, scarify and recompact top 6 inches (150 mm) below subgrade and compact each layer of backfill or fill soil material at 92 percent.

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

12.13 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.

B. Site Grading: Slope grades to direct water away from buildings and to prevent ponding.

C. Grading inside Building Lines: Finish subgrade to a tolerance of 1/2 inch (13 mm) when tested with a 10-foot (3-m) straightedge.

12.14 SUBBASE COURSE

A. Place subbase course on subgrade free of mud, frost, snow, or ice.

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

Retain option in two subparagraphs below if "and base" option is retained in paragraphs above.

1. Compact subbase 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 698.

12.15 DRAINAGE COURSE

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

B. On prepared subgrade, place and compact drainage course under cast-in-place concrete slabs-on-grade as follows:

1. Place drainage course that exceeds 6 inches (150 mm) in compacted thickness in layers of equal thickness, with no compacted layer more than 6 inches (150 mm) thick or less than 3 inches (75 mm) thick.

2. Compact each layer of drainage course to required thickness and to not less than 95 percent of maximum dry unit weight according to ASTM D 698.

12.16 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 where completed or partially completed surfaces become eroded, rutted, settled, or where they lose compaction due to subsequent construction operations or weather conditions.

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

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

12.17 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.

END OF SECTION 02300

SECTION 02751 - CEMENT CONCRETE PAVEMENT

PART 13 - GENERAL

13.1 SUMMARY

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

Adjust list below to suit Project.

1. Sidewalks.

13.2 SUBMITTALS

A. Product Data: For each type of product indicated.

B. Batch Certificates: For each batch used in the work.

C. Walkway Design: Contractor shall submit dimensioned drawing showing proposed walkway layouts from roadway parking to toilet building slab. Drawing shall include relative roadway and slab elevations, length, width, and slopes for both walkways. The design shall meet the requirements of ADAAG for an accessible route (unless noted otherwise on the drawings).

13.3 QUALITY ASSURANCE

A. Manufacturer Qualifications: Manufacturer of ready-mixed concrete products who complies with ASTM C 94/C 94M requirements for production facilities and equipment.

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

C. ADAAG: Comply with American with Disabilities Act Architectural Guidelines for design and construction of walkways.

PART 14 - PRODUCTS

14.1 STEEL REINFORCEMENT

A. Reinforcing Bars: ASTM A 615/A 615M, Grade 60 (Grade 420); deformed.

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

C. Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars and dowels in place. Manufacture bar supports according to CRSI's "Manual of Standard Practice."

14.2 CONCRETE MATERIALS

Retain option in paragraph below if final choice of cementitious material will be Contractor's option.

A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source throughout the Project:

Select portland cement type and color from options in subparagraph below.

1. Portland Cement: ASTM C 150, Type I, gray. Supplement with the following:

Select supplementary cementing materials from two subparagraphs below if permitted.

a. Fly Ash: ASTM C 618, Class C.

Select class of aggregate from options in first paragraph below or revise to suit Project.

B. Normal-Weight Aggregates: River gravel, approximately ¾” minus. Provide aggregates from a single source.

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

D. Air-Entraining Admixture: ASTM C 260.

E. Chemical Admixtures: ASTM C 494/C 494M, of type suitable for application, certified by manufacturer to be compatible with other admixtures and to contain not more than 0.1 percent water-soluble chloride ions by mass of cementitious material.

14.3 CURING MATERIALS

A. Absorptive Cover: AASHTO M 182, Class 2, burlap cloth.

B. Moisture-Retaining Cover: ASTM C 171, polyethylene film or white burlap-polyethylene sheet.

C. Water: Potable.

D. Evaporation Retarder: Waterborne, monomolecular film forming; manufactured for application to fresh concrete.

E. Clear Waterborne Membrane-Forming Curing Compound: ASTM C 309, Type 1, Class B, dissipating.

14.4 RELATED MATERIALS

1. Expansion- and Isolation-Joint-Filler Strips: ASTM D 1751, asphalt-saturated cellulose fiber.

14.5 CONCRETE MIXTURES

A. Prepare design mixtures, proportioned according to ACI 301, with the following properties:

1. Compressive Strength (28 Days): 3000 psi (20.7 MPa).

2. Maximum Water-Cementitious Materials Ratio at Point of Placement: 0.45.

3. Slump Limit: 4 inches (100 mm), plus or minus 1 inch (25 mm).

4. Air Content: 6 percent plus or minus 1.5 percent.

14.6 CONCRETE MIXING

Retain option in paragraph below if synthetic fibers are required.

A. Ready-Mixed Concrete: Measure, batch, and mix concrete materials and concrete according to ASTM C 94/C 94M. Furnish batch certificates for each batch discharged and used in the Work.

PART 15 - EXECUTION

15.1 DESIGN

A. Contractor shall layout walkways to ensure that each has a running slope of less than 1:20 and cross slope of less than 1:48.

15.2 EXAMINATION

A. Proof-roll prepared subbase surface below walkways with heavy equipment to identify soft pockets and areas of excess yielding.

15.3 EDGE FORMS AND SCREED CONSTRUCTION

A. Set, brace, and secure edge forms, and intermediate screed guides for walkways to required lines, grades, and elevations. Install forms to allow continuous progress of work and so forms can remain in place at least 24 hours after concrete placement.

B. Clean forms after each use and coat with form-release agent to ensure separation from concrete without damage.

15.4 STEEL REINFORCEMENT

A. General: Comply with CRSI's "Manual of Standard Practice" for fabricating, placing, and supporting reinforcement.

15.5 JOINTS

A. General: Form construction, isolation, and contraction joints and tool edgings true to line with faces perpendicular to surface plane of concrete. Construct transverse joints at right angles to centerline.

B. Construction Joints: Set construction joints at side and end terminations of pavement and at locations where pavement operations are stopped for more than one-half hour unless pavement terminates at isolation joints.

C. Isolation Joints: Form isolation joints of preformed joint-filler strips abutting existing roadways and concrete slabs.

D. Contraction Joints: Form weakened-plane contraction joints, sectioning concrete into areas as indicated on drawings. Construct contraction joints for a depth equal to at least one-fourth of the concrete thickness.

E. Edging: Tool edges of pavements and joints in concrete after initial floating with an edging tool to a 1/4-inch radius. Repeat tooling of edges after applying surface finishes. Eliminate tool marks on concrete surfaces.

15.6 CONCRETE PLACEMENT

A. Moisten subbase to provide a uniform dampened condition at time concrete is placed.

B. Comply with ACI 301 requirements for measuring, mixing, transporting, and placing concrete.

C. Deposit and spread concrete in a continuous operation between transverse joints. Do not push or drag concrete into place or use vibrators to move concrete into place.

D. Screed pavement surfaces with a straightedge and strike off.

E. Commence initial floating using bull floats or darbies to impart an open textured and uniform surface plane before excess moisture or bleed water appears on the surface. Do not further disturb concrete surfaces before beginning finishing operations or spreading surface treatments.

15.7 FLOAT FINISHING

A. General: Do not add water to concrete surfaces during finishing operations.

Initial floating operation is included in "Concrete Placement" Article.

B. Float Finish: Begin the second floating operation when bleed-water sheen has disappeared and concrete surface has stiffened sufficiently to permit operations. Float surface with power-driven floats, or by hand floating if area is small or inaccessible to power units. Finish surfaces to true planes. Cut down high spots and fill low spots.

1. Exposed aggregate finish: After the finish has set for 12 hours, the matrix of cement and fine aggregate shall be removed from the surface of the concrete by water jetting, coarse brooming, abrasive blasting, or a combination of these procedures to expose coarse aggregates to a depth of approximately ½ inch from the floated surface. Removal methods shall not dislodge or loosen the coarse aggregate from embedment in the concrete matrix. Exposed aggregate finish shall have cement film, discoloring agents, dirt, dust, grease, loose concrete, and other foreign material removed and shall be uniform in appearance. The exposed aggregate finish shall match the finish of the existing walkway outside the toilet building.

15.8 CONCRETE PROTECTION AND CURING

A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures.

B. Comply with ACI 306.1 for cold-weather protection.

C. Evaporation Retarder: Apply evaporation retarder to concrete surfaces if hot, dry, or windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h (1 kg/sq. m x h) before and during finishing operations. Apply according to manufacturer's written instructions after placing, screeding, and bull floating or darbying concrete, but before float finishing.

D. Begin curing after finishing concrete but not before free water has disappeared from concrete surface.

Select curing method from paragraph below.

E. Curing Methods: Cure concrete by moisture-retaining-cover curing.

15.9 PAVEMENT…