P17PS00752_Specifications.pdf

CHESAPEAKE AND OHIO CANAL

NATIONAL HISTORICAL PARK

REPAIR WATERED SECTIONS, LOCKS 5 - 22

CHOH

PMIS NO. 150819

FINAL CONSTRUCTION DOCUMENTS

NATIONAL PARK SERVICE

DENVER SERVICE CENTER

08/20/14

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050611 SUMMARY OF WORK

SECTION 01 11 00 - SUMMARY OF WORK

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Work covered by the Contract Documents.

2. Contractor use of premises.

3. Public use of site.

4. Work Restrictions.

5. Soils Investigation Report.

1.2 WORK COVERED BY CONTRACT DOCUMENTS

A. Project Location: C&O Canal, between Locks 5 and 22, Maryland.

B. The Work consists of the following:

1. The Work includes the repair to various watered sections of the canal. Repairs include raising the towpath, installing fuse plugs, installing a liner system in various parts of the canal, replacing exiting bridges and waste weirs, repointing lock walls, replacing lock gates and rebuilding dry laid stone walls.

C. Project will be constructed under a single prime contract.

1.3 CONTRACTOR USE OF SITE

A. General: Contractor shall have limited use of the site for construction operations. Limit use of premises to areas within the Contract limits indicated. Do not disturb portions of Project site beyond areas in which the Work is indicated.

1. Limits: Confine constructions operations to the designated staging areas and within the designated construction sites.

B. Storage of Materials: Confine storage of materials to the designated staging areas and within the construction sites.

C. Preservation of Natural Features:

1. Prevent damage to natural surroundings. Restore damaged areas, repairing or replacing damaged trees and plants, at no additional expense to the Government.

2. Provide temporary barriers to protect existing trees and plants and root zones.

3. Do not remove, injure, or destroy trees or other plants without prior approval. Consult with Contracting Officer and remove agreed-on roots and branches that interfere with construction.

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4. Do not fasten ropes, cables, or guys to existing trees.

5. Carefully supervise excavating, grading, filling, and other construction operations near trees to prevent damage.

D. Driveways and Entrances: Keep driveways and entrances serving premises clear and available to

Government, Government's employees, and emergency vehicles at all times. Do not use these areas for parking or storage of materials.

1. Schedule deliveries to minimize use of driveways and entrances.

2. Schedule deliveries to minimize space and time requirements for storage of materials and equipment on-site.

E. Construction Camp: Establishment of a camp within the park will not be permitted.

F. Hauling Restrictions: Comply with all legal load restrictions in the hauling of materials. Load restrictions on park roads are identical to the state load restrictions with such additional regulations as may be imposed by the Park Superintendent. Information regarding rules and regulations for vehicular traffic on park roads may be obtained from the Office of the Park Superintendent. A special permit will not relieve Contractor of liability for damage which may result from moving of equipment.

1.4 PUBLIC USE OF SITE

A. Contractor shall at all times conduct his operations to ensure the least inconvenience to the public.

Towpath and road closures will be permitted, when required, upon specific approval of Contracting

Officer for a maximum of one (1) day.

1.5 WORK RESTRICTIONS

A. On-Site Work Hours: Work shall be generally performed during normal business working hours of

7 a.m. to 5 p.m., Monday through Friday, except when otherwise indicated. No weekend work, holiday or night work is permitted without 48 hour advance notice and written approval by the

Contracting Officer.

1. Weekend Hours: 7 am to 5 pm.

2. Early Morning Hours: No work shall commence before 7 am.

3. Hours for work which may cause excessive noise>: 7 am to 5 pm.

B. Existing Utilities

1. Existing Utilities: Notify Contracting Officer and utility companies of proposed locations and times for excavation.

2. Contractor shall be responsible for locating and preventing damage to known utilities. If damage occurs, repair utility at no additional expense to the Government.

3. If damage occurs to an unknown utility, repair utility. An equitable adjustment will be made in accordance with the Changes clause of the contract.

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C. Existing Utility Interruptions: Do not interrupt utilities serving facilities occupied by Government or others unless permitted under the following conditions and then only after arranging to provide temporary utility services according to requirements indicated:

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

2. Do not proceed with utility interruptions without Contracting Officer’s written permission.

D. Nonsmoking Building: Smoking is not permitted within the building or within 25 feet of entrances, operable windows, or outdoor air intakes.

1.6 SPECIAL CONSTRUCTION REQUIREMENTS

A. Project Website: A project website administered by the NPS will be used for purposes of managing communication and documents during the construction stage.

1. See Section 01 31 00 “Project Management and Coordination” for requirements on using the Project Website.

2. During anticipated non-work days such as weekends and holidays, remove and store any traffic control devices within the staging area, to allow parking for park visitors.

B. The timeframe to perform the work at Level 20 is November 1 to April 1. All work requiring the canal to be dewatered must be completed by April 1 to allow the boat operations to commence.

C. Reassembly of retaining walls, with salvaged existing stone and compatible new stone, will reflect overall appearance of remaining intact walls, as determined by approved mock-up panel and affirmed by periodic progress inspections for duration of work. Where intact walls are knitted to rebuilt walls, the full field area must appear uniform and without apparent seams. Stonework transitions across a broad wall plane must be indistinguishable upon casual observation.

1.7 SOILS INVESTIGATION REPORT

A. A soils investigation report entitled has been prepared

B. A copy of the report is available to all plan holders with this package.

C. If conflicts occur between the report and drawings or specifications, the drawings and specifications govern.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION (Not Used)

END OF SECTION 01 11 00

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050611 DEFINITION OF CONTRACT LINE ITEMS

SECTION 01 27 00 – DEFINITION OF CONTRACT LINE ITEMS

PART 1 - GENERAL

1.1 SUMMARY

A. The intent of this section is to explain, in general, what is and what is not included in a contract line item, and the limits or cut-off points where one item ends and another begins.

B. If no contract line item exists for a portion of the work, include the costs in a related item.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1 LIST OF CONTRACT LINE ITEMS

A. Contract Line Item No. 1 (Option A) – Blockhouse Point Towpath Raising

1. This item consists of furnishing all material, equipment and labor to raise the towpath to the grades shown on the plans.

2. Measurement for payment will be the actual number of lineal feet of towpath raised.

3. Payment will be made at the contract unit price (LF)

B. Contract Line Item No. 2 (Option A) – Block house Point Reset Cap Stones

1. This item consists of all work necessary to retrieve, salvage, temporarily store, and reinstall existing mortared cap stones on the wall between the towpath and the Potomac River. Item also includes the purchase and installation of new capstones as required.

2. Measurement for payment will be per lineal foot.

3. Payment will be made at the contract unit price (LF).

C. Contract Line Item No. 3 (Option A) – Block house Point Reconstruct Stone Armoring

1. This item consists of all work necessary to dismantle the stone armoring, salvage existing stones and reinstall.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

D. Contract Line Item No. 4 (Option A) – Block house Point Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site, including staging areas, installation and removal of temporary erosion and sedimentation controls, supply of shuttle service to route visitors to Pennyfield Lock access area, signage to provide

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daily closure of towpath within the work area and all other items necessary to provide a safe work area.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

E. Contract Line Item No. 5 (Option A) – Block House Point New Stones for Stone Armoring

1. This item consists of supplying new stones that are needed for the reconstruction of the stone armoring as indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY).

F. Contract Line Item No. 6 (Base Bid) – Repair MP 16.9 Breach

1. This item consists of furnishing all work and materials necessary to install the fuse plug as shown on the plans. Shall also include the installation and removal of temporary coffer dams and pedestrian bypass. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

G. Contract Line Item No. 7 (Base Bid) – Level 20 Bridge/Waste Weir

1. This item consists of removing the existing bridge, concrete abutment walls, waste weir, and adjacent stone walls, salvaging the existing stones, installing a new concrete foundation, abutment walls, steel beams, and wood laminated deck, installing a new cast in place waste weir including new hardware, rebuilding the ashlar stone retaining wall with concrete footing at the south east corner of the bridge, rebuilding the dry stack stone walls along the west bank of the channel that runs toward the Potomac River,

2. No measurement will be made on lump sum items.

3. Payment will be made at the contract lump sum price (LS).

H. Contract Line Item No. 8 (Base Bid) – Level 20 Canal Desilting

1. This item consists of furnishing all work necessary to remove accumulated silt from the canal prism, including stockpiling material for drying and hauling material off-site to a legal disposal site.

2. Measurement for payment will be per cubic yard.

3. Payment will made at the contract unit price (CY).

I. Contract Line Item No. 9 (Base Bid) – Level 20 Canal Liner

1. This item consists of furnishing all material and work necessary for the construction of a clay liner system, including excavation, hauling waste material off-site, proof rolling, backfill, compaction, testing, and any other items necessary for a complete installation.

2. Measurement for payment will be the actual number of square feet of liner installed.

3. Payment will be made at the contract unit price (SF).

J. Contract Line Item No. 10 (Base Bid) – Level 20 Stream Diversion Piping

1. This item consists of furnishing all material and work necessary for the installation and removal of the temporary stream diversion through the work area, including relocating the piping as necessary to allow for the installation of the liner system and anchoring the piping.

2. No measurement will be made on lump sum items (LS).

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3. Payment will made at the contract lump sum price.

K. Contract Line Item No. 11 (Base Bid) – Level 20 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site, including installation and removal of temporary coffer dams, construction access and pedestrian bypass. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering of the canal prism. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

L. Contract Line Item No. 12 (Base Bid)- Level 20 New Stones for Walls

1. This item consists of supplying new stones that are needed for the reconstruction of the dry stack stone retaining wall indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY). There will be no payment made for stone material delivered to the site but not used in the wall construction.

M. Contract Line Item No. 13 (Base Bid) – Level 20 Lean Concrete

1. This item consists of all work necessary to supply and install lean concrete between existing rock and the bottom of the bridge abutment footing indicated on the plans.

2. Measurement for payment will be the actual number of cubic yards of concrete installed.

3. Payment will be made at the contract unit price (CY).

N. Contract Line Item No. 14 (Base Bid) – Lock 19 Bridge #1 Replacement

1. This item consists of all work necessary to remove and replace the existing bridge superstructure and wood rails over the lock.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

O. Contract Line Item No. 15 (Base Bid) – Lock 19 Bridge #2 Replacement

1. This item consists of all work necessary to replace the existing bridge substructure and superstructure and wood rails over the bypass flume and install dry stack stone retaining walls at each corner of the bridge

2. No measurement will be made on Lump Sum items.

3. Payment will made at the contract Lump Sum price.

P. Contract Line Item No. 16 (Base Bid) – Lock 19 Gates

1. This item consists of all work necessary to remove and install new lock gates at the east end of the lock structure.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at contract Lump Sum price.

Q. Contract Line Item No. 17 (Base Bid) – Lock 19 Bridge New Stones

1. This item consists of supplying new stones that are needed for the reconstruction of the dry stack stone retaining wall indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone delivered to the project site.

3. Payment will be made at the contract unit price (CY).

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R. Contract Line Item No. 18 (Base Bid) – Lock 19 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site.. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at contract Lump Sum price.

S. Contract Line Item No. 19 (Base Bid) – Lock 19 Repointing

1. This item consists of repointing deteriorated mortar joints on the face of the lock walls.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

T. Contract Line Item No. 20 (Base Bid) – Lock 18 New Gates

1. This item consists of removing and replacing the lock gates and mitre sill at the east and west ends of the lock.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

U. Contract Line Item No. 21 (Base Bid) - Lock 18 Repointing

1. This item consists of repointing deteriorated mortar joints on the face of the lock walls.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

V. Contract Line Item No. 22 (Base Bid) – Lock 18 Erosion Repair

1. This item consists of all work necessary to dismantle the existing stone armoring along the towpath and reinstalling stone to stabilize erosion adjacent to the towpath.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

W. Contract Line Item No. 23 (Base Bid) – Lock 18 New Stones for Erosion Repair

1. This item consists of supplying new stones that are needed for the repair of erosion adjacent to the towpath.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY). There will be no payment made for stone material delivered to the site but not used in the wall construction.

X. Contract Line Item No. 24 (Base Bid) – Lock 18 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at contract Lump Sum price.

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Y. Contract Line Item No. 25 (Base Bid) – Lock 17 New Gates

1. This item consists of removing and replacing the lock gates and mitre sill at the east and west ends of the lock.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

Z. Contract Line Item No. 26 (Base Bid) – Lock 17 Repointing

1. This item consists of repointing deteriorated mortar joints on the face of the lock walls.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

AA. Contract Line Item No. 27 (Base Bid) – Lock 17 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at contract Lump Sum price.

BB. Contract Line Item No. 28 (Option B) – Lock 16 New Gates

1. This item consists of removing and replacing the lock gates and mitre sill at the east and west ends of the lock.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

CC. Contract Line Item No. 29 (Option B) – Lock 16 Repointing

1. This item consists of repointing deteriorated mortar joints on the face of the lock walls.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

DD. Contract Line Item No. 30 (Option B) – Lock 16 Cribbing Wall

1. This item consists of furnishing all work to remove an existing timber cribbing wall filled with stone and installing a new timber cribbing wall filled with stone.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

EE. Contract Line Item No. 31 (Option B) – Lock 16 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site. Shall also include the construction and maintenance of ford to cross canal at location shown on the plans. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

3. Payment will be made at contract Lump Sum price.

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FF. Contract Line Item No. 32 (Option C) – Lock 15 New Gates

1. This item consists of removing and replacing the lock gates and mitre sill at the east and west ends of the lock.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

GG. Contract Line Item No. 33 (Option C)– Lock 15 Repointing

1. This item consists of repointing deteriorated mortar joints on the face of the lock walls.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

HH. Contract Line Item No. 34 (Option C)– Lock 15 Cribbing Wall

1. This item consists of furnishing all work to remove an existing timber cribbing wall filled with stone and installing a new timber cribbing wall filled with stone.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

II. Contract Line Item No. 35 (Option C)– Lock 15 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at contract Lump Sum price.

JJ. Contract Line Item No. 36 (Base Bid) – Culvert 15 Liner System

1. This item consists of furnishing all material and work necessary for the construction of a liner system, including excavation, hauling waste material off-site, proof rolling, installation of stone bedding, geotextile, liner, backfill, compaction, testing, anchor trench and any other items necessary for a complete installation.

2. Measurement for payment will be the actual number of square feet of liner installed.

3. Payment will be made at the contract unit price (SF).

KK. Contract Line Item No. 37 (Base Bid) – Culvert 15 Repointing

1. This item consists of repointing deteriorated mortar joints at the top of the stone arch barrel in the culvert at the location of the previous water leak. It also includes low pressure grouting of voids deep than six inches.

2. Measurement for payment will be the actual number of lineal feet of joint.

3. Payment will be made at the contract unit price (LF).

LL. Contract Line Item No. 38 (Base Bid) – Culvert 15 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site. Shall also include the removal of exiting coffer dams and piping. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering as necessary. Shall also include supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

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3. Payment will be made at contract Lump Sum price.

MM. Contract Line Item No. 39 (Option D)– Lock 14 Reconstruct Dry Laid Stone Wall

1. This item consists of all work necessary to dismantle the existing wall, salvage existing stones and reconstruct dry laid stone wall. Shall also include installing and removing all temporary controls necessary to provide safe access and to secure the work site, including supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

NN. Contract Line Item No. 40 (Option D)– Lock 14 New Stones for Walls

1. This item consists of supplying new stones that are needed for the reconstruction of the dry stack stone retaining wall indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY). There will be no payment made for stone material delivered to the site but not used in the wall construction.

OO. Contract Line Item No. 41 (Option E)– Lock 13 Reconstruct Dry Laid Stone Wall

1. This item consists of all work necessary to dismantle the existing wall, salvage existing stones and reconstruct dry laid stone wall. Shall also include installing and removing all temporary controls necessary to provide safe access and to secure the work site, including supplying adequate signage and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

PP. Contract Line Item No. 42 (Option E)– Lock 13 New Stones for Wall

1. This item consists of supplying new stones that are needed for the reconstruction of the dry stack stone retaining wall indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY). There will be no payment made for stone material delivered to the site but not used in the wall construction.

QQ. Contract Line Item No. 43 (Base Bid) – Rock Run Culvert

1. This item consists of all work necessary to selectively remove the existing dry stack stone retaining wall, salvage existing stones, and rebuild the wall with a combination of new and existing stone to toothe into the existing wall.

2. No measurement will be made on Lump Sum items.

3. Payment will be made at the contract lump sum price.

RR. Contract Line Item No. 44 (Base Bid) – Rock Run New Stones for Wall

1. This item consists of supplying new stones that are needed for the reconstruction of the dry stack stone retaining wall indicated on the plans.

2. Measurement for payment will be the actual cubic yards of stone installed in the wall.

3. Payment will be made at the contract unit price (CY). There will be no payment made for stone material delivered to the site but not used in the wall construction.

SS. Contract Line Item No. 45 (Base Bid) – Rock Run Concrete Patch Repair

1. This item consists of all work necessary to remove loose stone, install dowels, and install a formed concrete patch where the east side of the existing culvert wall has collapsed.

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2. Measurement for payment will be the actual cubic yards of concrete installed.

3. Payment will be made at the contract unit price (CY).

TT. Contract Line Item No. 46 (Base Bid) – Rock Run Stone Filler Repair

1. This item consists of all work necessary to install a stone filler or Dutchman repair in the side of the existing culvert stone walls.

2. Measurement for payment will be the actual square footage of Stone Filler Repair

Installed.

3. Payment will be made at the contract unit price (SF).

UU. Contract Line Item No. 47 (Base Bid) – Rock Run Liner System

1. This item consists of furnishing all material and work necessary for the construction of a clay liner system, including excavation, proof rolling, backfill, compaction, testing, and any other items necessary for a complete installation.

2. Measurement for payment will be the actual number of square feet of liner installed.

3. Payment will be made at the contract unit price (SF).

VV. Contract Line Item No. 48 (Base Bid) – Rock Run Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site, including installation and removal of temporary coffer dams and pedestrian bypass. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering of the canal prism. Shall also include supplying adequate signage, and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

WW. Contract Line Item No. 49 (Base Bid) – Lock 7 Waste Weir

1. This item consists furnishing all material and work necessary to demolish the existing waste weir and install a new precast box culvert and slide gate. Shall include all excavation, concrete forming, reinforcement, backfill and any other items necessary for a complete installation.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

XX. Contract Line Item No. 50 (Base Bid) – Lock 7 Fuse Plug

1. This item consists of furnishing all material and work necessary to install a new fuse plug near Lock 7. Shall include all excavation, backfill, towpath material and any other items necessary for a complete installation.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

YY. Contract Line Item No. 51 (Base Bid) – Lock 7 Temporary Controls

1. This item consists of furnishing, installing and removing all temporary controls necessary to provide safe access to the work site and to secure the work site, including installation and removal of temporary coffer dams and pedestrian bypass. Shall also include the installation and removal of temporary erosion and sedimentation controls. Shall also include the dewatering of the canal prism. Shall also include supplying adequate signage, CHOH - 150819 01 27 00 - 9 and personnel to direct construction and pedestrian traffic along the towpath during construction operations.

2. No measurement will be made on lump sum items (LS)

3. Payment will be made at the contract lump sum price.

END OF SECTION 01 27 00

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SELECTIVE DEMOLITION

SECTION 024119 - SELECTIVE DEMOLITION

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

B. Specification Section 044310 Dry Stone Masonry

C. Specification Section 013233 Photo Documentation for Historic Preservation Projects.

1.2 SUMMARY

A. Section Includes:

1. Demolition and removal of selected portions of the existing dry stone masonry retaining wall and salvaging the stones for use in building the new dry stone wall.

1.3 DEFINITIONS

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

B. Remove and Salvage: Carefully detach from existing construction, in a manner to prevent damage, and ready for reuse.

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

1.4 MATERIALS OWNERSHIP

A. Unless otherwise indicated, demolition waste becomes property of Contractor.

B. Historic items, relics, antiques, and similar objects including, but not limited to, cornerstones and their contents, commemorative plaques and tablets, and other items of interest or value to

Owner that may be uncovered during demolition remain the property of Owner.

1. Carefully salvage in a manner to prevent damage and promptly return to Owner.

1.5 INFORMATIONAL SUBMITTALS

A. Refer to Specification Section 044310 for the required Work Plan.

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PART 2 - PRODUCTS

2.1 PEFORMANCE REQUIREMENTS

A. Regulatory Requirements: Comply with governing EPA notification regulations before beginning selective demolition. Comply with hauling and disposal regulations of authorities having jurisdiction.

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

PART 3 - EXECUTION

3.1 EXAMINATION

A. Review record documents of existing construction provided by Owner. Owner does not guarantee that existing conditions are same as those indicated in record documents.

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

C. When unanticipated 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

Contracting Officer.

3.2 PREPARATION

A. Site Access and Temporary Controls: Conduct selective demolition and debris-removal operations to ensure minimum interference with walkways and roads.

1. Comply with requirements for access and protection specified in Section 015000

"Temporary Facilities and Controls."

B. Before commencing demolition and removal of selected walls, review photo recordation to ensure that stonework has been documented with sufficient clarity and detail to judge acceptability of finished reconstruction. If needed, record overall appearance of wall section with sufficient detail to compare existing with new work and substantiate flaws or obvious discrepancies.

3.3 SELECTIVE DEMOLITION, GENERAL

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. Proceed with selective demolition systematically, from higher to lower level. Complete selective demolition operations above each floor or tier before disturbing supporting members on the next lower level.

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B. Removed and Salvaged Items:

1. Clean salvaged items as indicated in 044310.

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

3.4 DISPOSAL OF DEMOLISHED MATERIALS

A. General: Except for items or materials indicated to be reused, salvaged, reinstalled, or otherwise indicated to remain Owner's property, remove demolished materials from Project site.

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

3.5 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 024119

CHOH 150819 04431 - 1

DRY STONE MASONRY

SECTION 04431 – DRY STONE MASONRY

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes the following applications of stone masonry:

1. Selectively disassembling dry laid stone masonry retaining walls and storing stones.

2. Constructing Dry Stone Masonry using original stones to the extent possible and new stones where needed. Mortar may be used in the interstitial spaces between stones provided that the mortar is held back from the exposed face of the stones by 4 inches or as indicated create a Dry Stone Masonry appearance. New Dry Stone Masonry walls shall match existing walls to remain in general appearance.

B. Related Sections:

1. Division 03 Section "Cast-in-Place Concrete" for foundations

2. Division 02 Section “Earthwork” for backfill

3. Division 04 Section “Mortar”

4. Division 01 Section “Photo Documentation for Historic Preservation Projects”

5. Division 01 Section “Historic Preservation Treatment Procedures”

1.3 DEFINITIONS

A. Dry Stone Masonry is stone masonry built without the appearance of mortar, but mortar may be used, provided that it is held back from the face of the wall by 4 inches unless otherwise indicated, in order to create a dry stone appearance.

B. Cap Stones are the stones placed on top of the wall over the face stones. Cap Stones shall match the existing cap stones in height or be at least 10 inches in height unless otherwise indicated.

C. Face Stones are the exposed stones in the front and back faces of the wall. Face stones shall be at least 8” in height.

D. Backing Stones are the stones placed behind the face stones that make up the thickness of the wall. Backing Stones shall be at least 6 inches in height and at least 12 inches in length and width

E. Packing Stones are smaller stones placed in gaps between Backing Stones. Packing stones shall be at least 2 inches thick and shall be at least 6 inches in length and width.

DRY LAID STONE MASONRY RETAINING WALLS 04431 - 2

F. Tie Stones are stones used to tie the stone courses together by lapping with other tie stones. Tie stones shall be at least 12 inches in height and extend 36 inches into the wall.

G. Pinning Stones are wedge shaped stones that are used to pack under the back edges of face stones. Pinning Stones shall be at least 2 inches in height.

H. Base Stones are the stones placed at the base of the wall on top of the concrete footing.

Base Stones shall be at least 12” in height and have length and width at least 24 inches.

1.4 SUBMITTALS

A. Stone Data:

1. For new stones proposed for use on the Project, include test data indicating compliance with physical properties with ASTM standards. New stones shall match the general appearance and color of the existing stones.

B. Samples for Verification:

1. Submit three samples of new stones that are proposed for use. Samples shall exhibit the extremes of the full range of color and other visual characteristics expected in completed Work. Samples will establish the standard by which stone provided will be judged. The contracting officer may reject sample stones that do not sufficiently match the existing stone. Once approved, all new stones used in the wall construction shall closely match the approved samples in color, texture, and strength.

C. Work Plan:

1. Provide a plan indicating how existing walls will be disassembled and where existing stones will be cleaned and stored when the existing walls are disassembled. Indicate where new stones will be stored. Indicate the manner in which the stones will be stacked and sorted. Indicate if any dressing of stone will be conducted.

D. Cut sheets for drainage panel and filter fabric

E. Qualification Data: For qualified Installer, a resume with at least two previous Dry Stone

Masonry retaining walls 5 or more feet high and each project with a color photograph of the completed wall, project reference, and phone number.

F. Provide a schedule for periodic field inspections of stone wall segments, for comparability evaluation of new installation with sample panel (simulating pre-demolition appearance) and for review and approval by CO of overall quality, consistency and compatibility of work.

1.5 QUALITY ASSURANCE

A. Installer Qualifications: A qualified installer who employs stonemasons and stone fitters with experience in installing dry stone retaining walls.

B. Source Limitations for New Stones: Obtain stone, from one quarry with resources to provide materials of consistent quality in appearance and physical properties.

CHOH 150819 04431 - 3

C. Samples: At each wall location, build a sample panel to demonstrate aesthetic effects and set quality standards for materials and execution.

1. Build a sample panel of a typical Dry Stone wall, at least 5 feet in length and 6 feet in height, as a sample of construction in a location approved by the Contracting Officer.

The sample panel, once approved by the Contracting Officer, may become part of the finished wall. Approval of sample panel is for color, texture, and blending of stone, and qualities of workmanship and overall consistency at matching pre-demolition appearance (or approved sample panel). Once approved, the sample panel will become the standard upon which other wall work at the location is compared to determine acceptability.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Store existing stones to be re-used in a manner that allows the stones to be easily sorted and retrieved for placement in the reconstructed wall.

1.7 PROJECT CONDITIONS

A. Stain Prevention: Immediately remove soil or other contaminants to prevent from staining the face of stone masonry.

1.8 COORDINATION

A. Advise installers of other work about specific requirements for placement of drainage pipes and similar items to be built into stone masonry.

PART 2 - PRODUCTS

2.1 NEW STONE

A. New stones shall be selected to match the original wall stones in type, size, color, and thickness

1. Stones shall have a minimum compressive strength of 5000 psi as per ASTM C170

B. Select New Stones to produce pieces of thickness, size, and shape indicated.

C. Thickness of Stone: Provide thickness similar to the existing stone

D. Shape stone for type of masonry (pattern) as follows:

1. Coursed rubble (fieldstone) with roughly squared flat surfaces similar to the existing wall stones.

E. Finish exposed faces and edges of stone similar to the stones in the existing wall.

DRY LAID STONE MASONRY RETAINING WALLS 04431 - 4

2.2 POROUS BACKFILL (CRUSHED STONE)

A. Porous Backfill, Size No. 57, Aggregate, as per Maryland Department of Transportation

Standard Specifications for Construction and Materials.

2.3 MORTAR

A. Mortar be as per SECTION 041000

2.4 FILTER FABRIC

A. Geotextile Fabric suitable for underdrains with min permittivity of 0.5 sec per ASTM

D4491 and apparent opening size per ASTM D4751 with soils type-1 (soils with 50% or less passing no 200 sieve) of AOS less than or equal to 0.6mm.

2.5 DRAINAGE BOARD

A. Commercial composite drainage board type 2 high flow dimpled core bonded to a single layer of non-woven filter fabric, as manufactured by Marflex or approved equal.

2.6 PIPE WEEPS

A. Pipe shall be black PVC schedule 40 of 3” diameter unless indicated otherwise.

PART 3 - EXECUTION

3.1 EXISTING WALL DISASSEMBLY

A. Ensure that photographic recordation of wall segment to be demolished along with adjacent stonework has been satisfactorily captured before beginning disassembly.

Remove stones from the existing Dry Stone Wall in a manner that does not damage the existing stones. Do not use equipment that damages stones. Methods employed that damage the stones may be rejected at any time by the Contracting Officer at no cost to the Government.

B. Store existing Cap stones, Tie stones, Face stones and Backing stones, in separate piles.

Store stones in a manner that will not cause damage to the existing stones.

3.2 CLEAN EXISTING WALL STONES THAT ARE TO BE RE-USED

A. Clean dirty or stained stone surfaces by removing soil, stains, and foreign materials before setting. Clean stones by power washing and if necessary thoroughly scrubbing with fiber brushes and then drenching with clear water. Do not use chemicals for cleaning stones.

3.3 SETTING OF DRY STONE MASONRY, GENERAL

CHOH 150819 04431 - 5

A. Layout walls using string lines or other approved means to provide the correct batter and coursing line. Raise the strings by the average height of the stones of each course.

B. Position Base Stones on the concrete foundation with the flat side down in a bed of mortar. Base stones shall not wobble or move.

C. Cover or break every joint between stones to avoid joints lining up vertically.

D. Lay Face Stones such that the longest dimension is going into the wall. Face Stones shall extend into the thickness of the wall at least 12 inches. Thinner stone “plates” may be used to build up the edges of larger stones to maintain height provided that they extend 8 inches into the wall. Face Stones shall be laid so that they do not wobble or move. Gaps between face stones should not exceed 3/4 inches.

E. Do not install Pinning Stones in the front face. Do not hammer stones in place so that other stones are displaced.

F. Place Tie Stones flush with the front face of the wall. Tie stones shall be placed such that they do not wobble. Place tie stones 36 inches apart maximum horizontally and vertically. Where tie stones do not extend through the thickness of the wall, lap tie stones at least 12 inches. Alternate tie stone locations between courses so that they are staggered and don’t align vertically.

G. Place Packing Stones in the core so that they fit tightly. Packing stones shall be as large as possible to fill the gaps between the Face Stones and Backing Stones. Do not dump in small rocks or gravel. Packing Stones shall be placed for each course of face stones before continuing to the next course.

H. Install mortar in the interstitial spaces between stones to form a solid wall. Hold mortar back 4 inches unless otherwise indicated from the exposed ace of the wall to create a dry stone appearance. Stones at the face of the wall shall bear on stones below so that each stone is supported at the face of the wall.

J. Install Cap Stones at the top of the wall. Cap Stones shall be placed such that the gap between adjacent Cap Stones is 1/2 inches or less.

K. All existing stones shall be re-used to the extent possible, particularly in the face of the wall. Install New Stones where needed to supplement the existing stone, in the back of the wall so that the face is not exposed to the extent possible.

L. Sort stone before it is placed in wall to remove stone that does not comply with requirements relating to aesthetic effects, physical properties, or fabrication or that is otherwise unsuitable for intended use.

M. Install drain pipes and weeps where indicated. Place large stones to bridge over the gap created for passage of the pipe. Provide 6 inches of bearing for the large stones. The gap should be only large enough to contain the pipe. Hold the end of the drain pipe back from the exposed face of the face stones by 4”.

N. Arrange stones in a coursing pattern similar to the existing walls.

DRY LAID STONE MASONRY RETAINING WALLS 04431 - 6

O. Arrange stones with color and size variations uniformly dispersed for an evenly blended appearance. Utilize the existing Face stones for the Face stones of the re-built walls.

Place New Stones in the interior or back face of the wall.

3.4 POUROUS BACKFILL

A. Where indicated, place porous backfill material in layers in conjunction with the adjacent fill. When a form is used between the porous backfill material and the adjacent fill, completely remove the form. Install geotextile, drain tile, and porous backfill as indicated. See Division 2 specifications.

3.5 DRAINAGE BOARD AND FILTER FABRIC

A. Install drainage board against the back of the wall. Fasten drainage board sufficiently to prevent displacement during backfill. Extend board to the filter fabric and pipe weeps.

Extend pipe weep from crushed stone through wall. Wrap crushed stone in geotextile filter fabric. Exit pipe weeps above grade. Hold the end of the pipe back within the stone wall so that the end of the pipe is not exposed.

3.6 EXCESS MATERIALS AND WASTE

A. Disposal as Fill Material: Dispose of clean masonry waste, including mortar and excess or soil-contaminated sand, by crushing and mixing with fill material as fill is placed.

1. Crush masonry waste to less than 2 inches in greatest dimension.

2. Mix masonry waste with at least two parts of specified fill material for each part of masonry waste. Fill material is specified in Division 31 Section "Earth Moving."

3. Do not dispose of masonry waste as fill within 18 inches of finished grade.

B. Excess Masonry Waste: Remove excess clean masonry waste that cannot be used as fill, as described above, and other waste, and legally dispose of off Owner's property.

3.7 QUALITY CONTROL INSPECTION

A. The CONTRACTOR shall employ a testing and inspection agency to perform inspections and to submit reports as specified herein. The Contractor shall provide the testing and inspection agency with a minimum of 24 hours notice prior to all required inspections.

B. The testing and inspection agency shall review the following checklist and verify conformance with the specifications and drawings for each day’s work:

1. The size and batter of the wall meets the minimum dimensions indicated.

2. The base stones do not wobble when walked on.

3. Stones have been placed in contact with all their neighboring stones.

CHOH 150819 04431 - 7

4. Stones are laid so that vertical joints between stones of adjacent courses do not line up.

5. The packing stones or mortar is placed with no gaps or spaces that allow movement.

6. The spacing and lap of tie stones has been verified.

7. The cap stones are placed level and do not move easily by hand.

8. Mortar is held back from the face of the wall.

9. Mortar is mixed in the specified proportions.

10. Mortar that is more than 30 minutes old is discarded.

C. Work that is determined to be non-compliant shall be removed and replaced at no additional cost to the Government.

D. Submit a report to the Contracting Officer for each day’s work.

END OF SECTION 04431

CHOH 150819 061900- 1

TIMBER MITRE GATES

COMPLETE

SECTION 061900 – TIMBER MITER GATES COMPLETE

I. GENERAL

1. DESCRIPTION

A. Under this work, the contractor shall field measure existing conditions, fabricate, furnish, and install timber miter gates and miter sill complete with all hardware, anchors, balance beams, and butterfly valves in accordance with the contract documents and as directed by the COTR. The miter gate opening and closing shall be demonstrated by the contractor after installation.

2. SUBMITTALS

A. Manufacturer’s data sheets for paint to be used on galvanized surfaces. Include certification of compatibility with galvanized surfaces and recommended means of surface preparation.