2022_04_06_McCandless_Avenue_Stair_Replacement_-_Special_Provisions.pdf

McCandless Avenue Stair Replacement – Special Provisions - 3-14-2022

1. Preface to Contract Special Provisions

2. ITEM 4676-0002 CONCRETE SIDEWALK, 6”, MODIFIED

3. ITEM 4695-0004 DETECTABLE WARNING SURFACE, MODIFIED

4. ITEM 9000-0001 ANTI-GRAFFITI COATING

5. ITEM 9000-0002 CLASS AAA CEMENT CONCRETE MODIFIED

6. ITEM 9000-0003 ROADWAY REPAIR

7. ITEM 9000-0004 EXISTING STAIR DEMOLITION

8. ITEM 9000-0005 EROSION AND SEDIMENTATION CONTROL

9. ITEM 9000-0006 PRECAST CONCRETE

10. ITEM 9000-0007 RAILING

11. ITEM 9000-0008 CONCRETE DEEP CURB

12. ITEM 9000-0009 BIKE RUNNEL

13. ITEM 9000-0010 SOLDIER PILES, W18X130, GALVANIZED

14. ITEM 9000-0011 PRECAST CONCRETE LAGGING

15. ITEM 9000-0012 MAINTENANCE AND PROTECTION OF TRAFFIC

16. ITEM 9203-0101 TEMPORARY EXCAVATION SUPPORT AND PROTECTION SYSTEM

PREFACE TO CONTRACT SPECIAL PROVISIONS

Special Provisions for the construction of this contract reference the Pennsylvania Department of Transportation (PennDOT) Publication 408, 2020 through Change No. 4 as located online as follows:

https://www.dot.state.pa.us/public/PubsForms/Publications/Pub_408/408_2020/408_2020_4/408_202 0_4.pdf

Section references and specific paragraph references in the Contract Special Provisions correspond to Publication 408. Notations indicated in the Contact Special Provisions as “add the following”, “revise as follows”, or other similar notations mean that the referenced section or paragraph in Publication 408 is being modified by adding, revising, or as otherwise stated.

The first four digits of item numbers refer to the section number in Publication 408 that provides the corresponding specification for the work. In this case the PennDOT standard specifications govern the work that is to be performed. When the first four digits of the item number begin with an “8” or “9”, the work is governed by the special provision.

ITEM 4676-0002 CONCRETE SIDEWALK, 6”, MODIFIED

In accordance with PennDOT Publication 408, Section 676, except as follows:

DESCRIPTION – In accordance with PennDOT Publication 408, Section 676.1, except revise to read as follows:

This work is the construction of a reinforced cement concrete sidewalk on an aggregate bed.

MATERIAL – In accordance with Section 676.2, except revise as follows:

Delete first bullet and add the following:

(a) Concrete. Class AA Cement Concrete – In accordance with PennDOT Publication 408, Section 704, except must have a 28-day compressive strength of 4000 psi.

(b) Reinforcement. Welded Wire Fabric – In accordance with PennDOT Publication 408, Section 709.3:

For 4” sidewalk – 6” x 6” – W1.4 xW1.4

For 6” sidewalk – 6” x 6” – W2.9 x W2.9

CONSTRUCTION – As shown in SC-500 of the City of Pittsburgh Standards of Construction, Appendix B of the Right-of-Way Procedures Policy Manual (current edition) and in accordance with PennDOT Publication 408, Section 676.3, except revise as follows:

(a) Preparation of Foundation. Replace first sentence to read as follows:

Excavate as required, and form the foundation at a depth 8 inches parallel (for 4” sidewalk) or 10 inches parallel (for 6” sidewalk) with the finished surface of the sidewalk.

(b) Placing Aggregate for Bed. Replace the first sentence to read as follows:

Spread aggregate to form a thoroughly compacted bed 4” deep.

(d) Concrete. As specified in PennDOT Publication 408, Section 1001.3. Replace the section as follows:

Place concrete 4 or 6 inches deep, as directed. Strike off, finish and test, as specified in PennDOT Publication 408, Section 501.3(k) and (p), except that manual operations are allowed and a light broom finish applied, unless otherwise specified or to match existing conditions.

Lay welded wire fabric and construct all joints as specified in SC-500 of the City of Pittsburgh Standards of Construction.

(h) Curb Ramps. Delete this Section.

END OF SPECIAL PROVISION

ITEM 4695-0004 DETECTABLE WARNING SURFACE, MODIFIED

In accordance with PennDOT Publication 408, Section 695, except as follows:

MATERIAL – In accordance with PennDOT Publication 408, Section 695.2(a), except delete third bullet and add the following:

Color. Federal Standard 595 – Orange Yellow (33538).

Also, under PennDOT Publication 408, Section 695.2(b), delete first bullet and add the following:

Class AA Cement Concrete – In accordance with PennDOT Publication 408, Section 704, except must have a 28-day compressive strength of 4000 psi.

ITEM 9000-0001 ANTI-GRAFFITI COATING

DESCRIPTION – This item consists of the application of an anti-graffiti coating to all exposed concrete surfaces other than walking surfaces.

MATERIAL – Provide MasterProtect H 1000 or approved equal.

1. Submit the proposed anti-graffiti coating system to the City Representative for approval prior to ordering coating materials.

2. The sealer must be non-yellowing and ultra-violet resistant.

CONSTRUCTION –

a. All surfaces that are to be coated must be power washed prior to application of the anti-graffiti coating with the use of a high pressure hose having a minimum pressure of 2,000 psi at the nozzle. In addition to the power washing, prepare the surface and apply the anti-graffiti coating in accordance with the manufacturer’s recommendations.

b. Perform a water bead test on the power washed surface before applying the first coat of anti-graffiti system. If the water beads on the surface, rewash until the water doesn’t bead.

c. Coat all exposed surfaces other than walking surfaces.

d. No thinning is permitted unless recommended by the coating manufacturer and approved by the City Representative.

e. Do not apply a pigmented anti-graffiti coating.

MEASURMENT AND PAYMENT – Square Yard

ITEM 9000-0002 CLASS AAA CEMENT CONCRETE MODIFIED

In accordance with Section 1001 except as follows:

1001.1 DESCRIPTION –

This work is construction of all cast-in-place components as indicated.

1001.2 MATERIAL –

(a) Cement Concrete. Class AAA Cement Concrete per Section 704 except as follows:

1. Cement – Section 701, except use white Portland cement containing no more than 0.50% by weight of iron oxide.

Do not add fly ash or ground granulated blast furnace slag to concrete.

2. Fine Aggregate – Section 703.1, Type A, except add the following:

Provide white fine aggregate, from an approved source, of either crushed white marble, white limestone, or calcite. Provide aggregate that is clean, washed and free from dirt or any discoloring matter not containing more than 0.75% of ferric oxide.

3. Coarse Aggregate, Type A – Section 703.2 except add the following:

Use No. 8 Coarse Aggregate. Use only light colored crushed stone or aggregate with at least three faces resulting from fracture. Do not use slag.

4. Water – Section 720.1 except add the following:

Potable and free from iron or other impurities which may cause staining.

5. Admixtures – Section 711.3 except add the following:

Use only those admixtures that do not discolor the white cement concrete. Obtain written assurance from the manufacturer that the admixture does not cause staining.

(b) Reinforcement Steel. Use epoxy coated reinforcement bars or welded wire fabric per Section 709.

(c) Protective Coating. Use boiled linseed oil per Section 1019.

(d) Joint Material. Use expansion joint filler and asphalt rubber sealing compound per Section 705.

1001.3 CONSTRUCTION – In accordance with Section 1001.3 and 1002.3 and as follows:

(a) Section 1001.3(a)1. Add the following:

Use only form release oil that will not contribute to the discoloration of the white cement concrete. Obtain written assurance from the manufacture that the product does not cause discoloration.

(b) Section 1001.3(j). Add the following:

Use clean equipment for batching and mixing to prevent contamination by materials which may cause discoloration. Cement bins, weigh hoppers and mixers are to be free of loose gray cement. Use only form release oil that will not discolor the white cement concrete.

(c) Section 1001.3(p)3a. Add the following:

Use only white, liquid membrane-forming curing compound. Cover barrier with white polyethylene sheeting after applying curing compound. Until forms are removed, protect exposed concrete by the water cure method using only new burlap that is free of sizing or any substance that will cause staining. Thoroughly rinse the new burlap in water to remove soluble substances before placing on concrete surfaces.

(d) Section 1001.3(t). Add the following:

Apply boiled linseed oil per Section 1019 to all cast-in-place walking surfaces.

1001.4 MEASUREMENT AND PAYMENT – In accordance with Section 1001.4 and as follows:

Epoxy coated reinforcement bars, welded wire fabric, joint material and sealer, and protective coating are incidental to this item.

ITEM 9000-0003 ROADWAY REPAIR

DESCRIPTION – This work is the repair of damage to any roadway during construction for this project.

Perform repair work in accordance with the applicable sections of Publication 408 and as directed.

MATERIAL – Furnish material for repair work that is compatible with the existing roadway, as determined by the Inspector-in-Charge.

CONSTRUCTION – The contractor is responsible for surveying any roadway adjacent to the work site for this project prior to the start of construction. This includes video-taping and documenting pre-construction conditions. Contact the Inspector-in-Charge or authorized representative to be present at the survey. Provide copies of the pre and post-construction video to the representative within 14 days of when the video is taken.

Survey any roadway adjacent to the worksite for this project after construction is complete to determine areas of damage to all roadways. Contact the Inspector-in-Charge or authorized representative to also be present at this survey. Repair or reconstruct damaged roadway to restore the profile and/or cross-slope to original or like condition, to the satisfaction of the Inspector-in-Charge or authorized representative.

MEASUREMENT AND PAYMENT – Dollar.

The proposal will include an item and a predetermined amount of money for ROADWAY REPAIR. The contract item will have a unit of measure of Dollar, a unit price of $1.00, and a quantity equal to the predetermined amount.

Due to the contingent or unpredictable nature of the work being performed and/or the incentive or bonus status of the payment being made, the provisions of Section 110.02(d) are not applicable to this item.

Measured and paid for, under the ROADWAY REPAIR item as follows:

- Contract Items. For performance of work identified as having similar items listed in the contract, the contract unit price will be paid.

- Non-Contract Items. Items of work not identified in the contract will be paid as follows:

1. Negotiated Price. At an agreed upon price. This price will be agreed upon with the City prior to performing the work.

Force Account Work. Section 110.03(d).

ITEM 9000-0004 EXISTING STAIR DEMOLITION

In accordance with Section 202 except as follows:

202.1 DESCRIPTION –

This work is the demolition of the existing stairs and landings as indicated on the plans.

202.3 CONSTRUCTION –

Prior to existing stair excavation, sample and test railing paint for lead. If lead is found, excavate and test concrete and soil areas centered below railing measuring two feet in width and one foot deep. If lead levels exceed allowable limits for clean fill, properly dispose according to PADEP guidelines.

Remove existing stairs and landings and excavate to 1 foot below ground elevation. This excavation and removal are incidental to stair demolition. In areas where there is a conflict with new substructure units or other construction, remove the existing structure in its entirety.

Coordinate with overhead utilities prior to commencing demolition work.

Dispose of all debris and waste stair/landing concrete, reinforcement materials, etc. in accordance with Section 105.14 regarding waste and borrow areas. Do not place any of these materials in any proposed fill embankment. Excavated soils free of all concrete, reinforcement, and railing materials and other debris can be used for backfill of proposed stairs.

Work is to proceed from the bottom of the stairs along Stanton Avenue progressing up to McCandless Avenue with the demolition of one landing at a time.

Do not permit debris to fall onto Stanton Avenue.

Blasting is not permitted.

Work to be completed within the existing legal right-of-way.

Coordinate the removal operations with the Maintenance and Protection of Traffic Special Provision and Erosion and Sediment Pollution Control Plan and Special Provision.

MEASUREMENT AND PAYMENT – Lump Sum (LS)

This item includes all necessary disposal of debris and waste as indicated and proper disposal of all materials.

ITEM 9000-0005 EROSION AND SEDIMENTATION CONTROL

DESCRIPTION –

This work includes the installation, maintenance, removal and disposal of all materials for the sediment control system as described in Publication 408 Section 867.

MATERIALS –

18” Diameter Compost Filter Socks – Section 867

Wooden stakes (2” x 2” x 36”) at 10’ O.C.

Seeding & Soil Supplements – Formula B, Including Mulch – Publication 408, Section 804

CONSTRUCTION –

Compost Filter Sock is to be installed down slope of the foundation excavations. Install as shown on the attached E&S Plan included in the Construction Plans. Stabilize all disturbed areas with appropriate seeding and soil supplements.

MEASUREMENT AND PAYMENT – Lump Sum (LS)

Includes all materials and labor required for the proper installation, maintenance, and removal and disposal of the E&S items as shown on the plans.

ITEM 9000-0006 PRECAST CONCRETE

This item is for the precast components as indicated, including the optional stair support caps. If the

Contractor elects to precast the stair support caps, the quantity of Class AAA Cement Concrete Modified shall be reduced accordingly.

In accordance with Section 714 and as follows:

714.1 GENERAL REQUIREMENTS –

(b) Shop Drawings – Add the following:

Shop drawings and supporting calculations shall be submitted to the City for review and approval prior to fabrication.

Shop drawings shall include all connections of the precast concrete components to cast-in-place components.

Shop drawings must indicate that existing dimensions that relate to the affected work have been field verified before shop drawings can be approved.

714.2 PRECAST CONCRETE UNITS – Add the following:

Stairs

Deck Panels

Stair Support Caps

714.3 MATERIAL – Add the following:

Cement Concrete. Class AAA Cement Concrete per Section 704 except as follows:

1. Cement – Section 701, except use white Portland cement containing no more than 0.50% by weight of iron oxide.

Do not add fly ash or ground granulated blast furnace slag to concrete.

2. Fine Aggregate – Section 703.1, Type A, except add the following:

Provide white fine aggregate, from an approved source, of either crushed white marble, white limestone, or calcite. Provide aggregate that is clean, washed and free from dirt or any discoloring matter not containing more than 0.75% of ferric oxide.

3. Coarse Aggregate, Type A – Section 703.2 except add the following:

Use No. 8 Coarse Aggregate. Use only light colored crushed stone or aggregate with at least three faces resulting from fracture. Do not use slag.

4. Water – Section 720.1 except add the following:

Potable and free from iron or other impurities which may cause staining.

5. Admixtures – Section 711.3 except add the following:

Use only those admixtures that do not discolor the white cement concrete. Obtain written assurance from the manufacturer that the admixture does not cause staining.

6. Use normal weight concrete only.

7. Use minimum 28-day compressive strength of 4,000 psi.

Reinforcement Steel. Use epoxy coated or galvanized reinforcement bars or welded wire fabric per Section 709.

714.7 CONCRETE – Add the following:

Use clean equipment for batching and mixing to prevent contamination by materials which may cause discoloration. Cement bins, weigh hoppers and mixers are to be free of loose gray cement. Use only form release oil that will not discolor the white cement concrete.

Apply a broom finish to all walking surfaces of the precast components.

Include a non-slip tread for each step.

Include threaded inserts as indicated for the attachment of the railing posts.

714.8 CURING AND PROTECTIVE COATING – Add the following:

(a) Curing. Add the following:

Use only form release oil that will not contribute to the discoloration of the white cement concrete. Obtain written assurance from the manufacture that the product does not cause discoloration.

(b) Protective Coating. Add the following:

Apply boiled linseed oil to all precast walking surfaces. Anti-graffiti coating to be applied to all exposed surfaces other than walking surfaces per item 9000-0001.

MEASUREMENT AND PAYMENT – Lump Sum (LS)

Includes delivery and erection.

ITEM 9000-0007 RAILING

This item is to supply and install the ADA compliant handrail to be post mounted to the side of the landing/stairs.

Manufacturer is to be listed in Bulletin 15 or to comply with sections 105 and 106 for fabrication and be approved for the manufacturing of handrails by the city.

In accordance with Section 1022 – STEEL BRIDGE HAND RAILING or 1023 – ALUMINUM BRIDGE HAND RAILING. Comply with Section 105 and 106 for fabrication and as follows:

MATERIALS – Add the following:

Handrails and Guardrails: 1½“ diameter Schedule 40, Type 304 Stainless Steel pipe OR Schedule 40, ASTM B241-Alloy 6061-T6, 6063-T6 or ASTM B429-Alloy 6061-T6, 6063T6 Aluminum pipe suitable for outdoor use.

Posts: 1½“ diameter Schedule 80, Type 304 Stainless Steel pipe OR Schedule 80, ASTM B241- Alloy 6061-T6, 6063-T6 or ASTM B429-Alloy 6061-T6, 6063T6 Aluminum pipe suitable for outdoor use.

Open steel mesh: Stainless steel, Type 304, Woven Mounting plates, frames, and tabs and bolts for connection of frame housing open steel mesh to the posts and railing are to be stainless steel or aluminum.

Provide a glass bead blast with a surface finish of 35-45 Ra. The pipe shall be plastic-wrapped.

The plastic wrap is to be removed after erection.

CONSTRUCTION –

As indicated on the plans.

Railing shall be shop assembled in lengths not to exceed 24 feet for field erection.

Handrail is to be post mounted to side of landings/stairs. Fabricator to detail connection plate and fasteners per the precast insert locations indicated on the plans.

Post spacing shall be a maximum of 6’-6”.

Open steel mesh shall be used between the rails. Welding open steel mesh directly to the rails and posts is not permitted. Open steel mesh must be housed in a frame that is bolted to tabs that are welded to the rails.

Intermediate railings and open steel mesh shall be provided such that a 4-inch diameter sphere cannot pass through any opening up to a height of 34 inches. From a height of 34 inches to 42 inches above the adjacent walking surface, a sphere 8 inches in diameter shall not pass. The triangular openings formed by the riser, tread and bottom rail at the open side of a stairway shall be of a size such that a sphere of 6 inches in diameter cannot pass through the opening.

Mesh spacing shall prevent climbing.

Posts shall not interrupt the continuation of the top rail at any point along the railing, including corners and end terminations (OSHA 1910.23). The top surface of the top railing shall be smooth and shall not be interrupted by projected fittings.

Handrails shall be made of pipes. Field sections shall be joined together with component fittings or field welded. Samples of all components, bases, toe plates and pipes shall be submitted for approval at the request of the engineer. Pop-riveted or glued components are unacceptable. All components must be mechanically fastened with stainless steel hardware. Any handrail fasteners must be flush with the railing.

Guardrails and handrails shall be designed to withstand a 200 lb concentrated load applied in any direction and at point on the top rail. Guardrails and handrails shall also be designed to withstand a uniform load of 50 lb/ft applied horizontally to the top rail. Uniform loads are not to be applied simultaneously with the concentrated loads.

Intermediate railings and open steel mesh shall be designed to withstand a horizontally applied normal load of 50 lb on an area not to exceed one square foot including openings and space between rails.

The mid-rail at a corner return shall be able to withstand a 200 lb load without loosening. The manufacturer is to determine this dimension for their system and provide physical laboratory tests to confirm compliance.

The manufacturer shall submit calculations for approval at the request of the engineer. Testing of base castings or base extrusions by an independent lab or manufacturer’s lab will be an acceptable substitute for calculations. Calculations will be required for approval of all other design aspects. Submit design calculations signed and sealed by a professional engineer registered in the Commonwealth of Pennsylvania.

Stainless steel surfaces in contact with concrete, grout or dissimilar metals will be protected with a coat of bituminous paint, Mylar isolators or other approved material.

Prior to ordering, provide shop drawings for guard railings, handrails, posts, mounting plates, mesh, metal frame, and connection of mesh to metal frame/metal frame to posts to the City Representative for review and approval.

Installed railing and handrails shall met specifications for ANSI and ADA.

MEASURMENT AND PAYMENT – Linear Foot (LF)

Measured horizontally from center to center of end posts.

Handrail installation includes all posts, handrails, guard rails, open mesh, bolts, anchors, mounting plates, gates, drilling, fittings, and other hardware as required for the final installation of the railings.

ITEM 9000-0008 CONCRETE DEEP CURB

DESCRIPTION – This work is the construction of a Concrete Deep Curb and underdrain, Concrete Depressed Deep Curb and underdrain for ramps and driveways and Concrete Deep Radius Curb and underdrain as indicated in SC-100 and SC-502a through SC-502-i in the City of Pittsburgh Standards of Construction, Appendix B of the Right-of-Way Procedures Policy Manual (current edition).

MATERIALS – In accordance with PennDOT Publication 408, Section 630.2, except add the following:

Class 4 Excavation – in accordance with PennDOT Publication 408, Section 204.

Geotextiles, Class 1 – in accordance with PennDOT Publication 408, Section 212.

Geotextiles, Class 4, Type A – in accordance with PennDOT Publication 408, Section 212.

Pipe Underdrain – in accordance with PennDOT Publication 408, Section 610.

No. 2A Coarse Aggregate – in accordance with PennDOT Publication 408, Section 703.

Preformed Cellular Polystyrene – In accordance with ASTM C 578, sheets with a thickness between 3/16” – ½”.

Class AA Cement Concrete – In accordance with PennDOT Publication 408, Section 704, except must have a 28-day compressive strength of 4000 psi.

CONSTRUCTION – As shown in SC-100 and SC-502a through SC-502i of the City of Pittsburgh Standards of Construction, Appendix B of the Right-of-Way Procedures Policy Manual (current edition).

MEASURMENT AND PAYMENT – Depressed curb will be measured and paid for as full depth curb of the type indicated.

(a) Concrete Deep Curb. Linear Foot

(b) Concrete Deep Radius Curb. Linear Foot

(c) Class 1 Excavation. Incidental

(d) Class 1B Excavation. Incidental. For street pavement removal, saw cut is incidental.

(e) Class 4 Excavation. Incidental. For extra-depth pipe underdrain, in excess of that shown on the Standard Drawings, as directed.

ITEM 9000-0009 BIKE RUNNEL

This item is to supply and install a bike runnel along the edge of the stairs and landings adjacent to the handrails.

Manufacturer is to be listed in Bulletin 15 and approved for the manufacturing of aluminum channels by the City.

In accordance with Section 1023 and as follows:

MATERIALS – Revise as follows:

(a) Runnel – Channel, 6” x 2.5” x 0.170” x 0.290” Aluminum Alloy 6061-T6, or Approved Equal.

Runnel – Plate, Aluminum Alloy 6061-T6 Plate

(d) Bolts, nuts, washers, Section 1105.02(c), (galvanized)

CONSTRUCTION –

Install a bike runnel at the right side of all the steps when looking “UP” the stairway.

Provide runnel and runnel anchors as shown on the plans.

Complete installation of the bike runnel as indicated.

Any construction outside of runnel must allow enough clearance for bike pedals and handlebars without interfering with movement.

MEASURMENT AND PAYMENT – Linear Foot (LF)

Runnel installation includes all rails, bolts, anchors, drilling, plates, treads, etc. necessary for the full, final installation of the bicycle runnel.

ITEM 9000-0010 SOLDIER PILES, W18x130, GALVANIZED

DESCRIPTION – This work is furnishing and installing steel soldier piles in drilled caissons for the soldier pile and lagging retaining wall.

MATERIAL – Steel soldier piles - AASHTO M270 (ASTM A709, Grade 50) and galvanized in accordance with Section 1105.02(s). Fabricate steel soldier piles in accordance with Section 1105.

CONSTRUCTION – Set steel piles to required depth and to indicated top of pile elevation. Maintain close conformance to pile spacing and alignment. Maintain piles in vertical position with a deviation of not more than 1/4-inch in 10 feet.

Shop weld shear studs for the closure pours at the proper locations on the piles (as indicated in the plans and field verified) prior to galvanizing of the piles. Galvanize the entire soldier pile assembly, including the shear studs. Replace any damaged shear studs by field welding prior to placement of soldier pile in drilled shaft. Prior to replacing damaged shear connectors, remove galvanizing from the shear connector weld area by grinding or other suitable means. Do not damage the soldier pile flange.

After installing replacement shear connectors, repair the area of bare steel around the shear connectors in accordance with Section 1105.02(s)2.

Repair any damage to the galvanized surface of the soldier piles in accordance with Section 1105.02(s)2 after installation.

MEASURMENT AND PAYMENT – Measured per linear foot of soldier pile installed. (Payment for attached shear connectors is included in item 1050-0089 Shear Connectors)

ITEM 9000-0011 PRECAST CONCRETE LAGGING

This item is for fabricating and installing precast concrete lagging.

In accordance with Section 714 and as follows:

714.1 GENERAL REQUIREMENTS –

(b) Shop Drawings – Add the following:

Shop drawings and supporting calculations shall be submitted to the City for review and approval prior to fabrication. All design calculations submitted to the City must be sealed and signed by a professional engineer registered in the Commonwealth of Pennsylvania.

Shop drawings shall include all connections of the precast concrete lagging to cast-in-place and steel components.

Shop drawings must indicate that existing dimensions that relate to the affected work have been field verified before shop drawings can be approved.

Provide additional field survey of lagging supports in order to assure level construction.

714.2 PRECAST CONCRETE UNITS – Add the following:

Lagging Panels

714.3 MATERIAL – Add the following:

Cement Concrete. Class AAA Cement Concrete per Section 704 except as follows:

1. Cement – Section 701, except use white Portland cement containing no more than 0.50% by weight of iron oxide.

Do not add fly ash or ground granulated blast furnace slag to concrete.

2. Fine Aggregate – Section 703.1, Type A, except add the following:

Provide white fine aggregate, from an approved source, of either crushed white marble, white limestone, or calcite. Provide aggregate that is clean, washed and free from dirt or any discoloring matter not containing more than 0.75% of ferric oxide.

3. Coarse Aggregate, Type A – Section 703.2 except add the following:

Use No. 8 Coarse Aggregate. Use only light colored crushed stone or aggregate with at least three faces resulting from fracture. Do not use slag.

4. Water – Section 720.1 except add the following:

Potable and free from iron or other impurities which may cause staining.

5. Admixtures – Section 711.3 except add the following:

Use only those admixtures that do not discolor the white cement concrete. Obtain written assurance from the manufacturer that the admixture does not cause staining.

6. Use normal weight concrete only.

7. Use minimum 28-day compressive strength of 4,000 psi.

Reinforcement Steel. Use epoxy coated or galvanized reinforcement bars or welded wire fabric per Section 709.

Plain Elastomeric Bearing Pads. Provide plain elastomeric bearing pads for support of lagging panels in accordance with Section 1113.

714.7 CONCRETE – Add the following:

Use clean equipment for batching and mixing to prevent contamination by materials which may cause discoloration. Cement bins, weigh hoppers and mixers are to be free of loose gray cement. Use only form release oil that will not discolor the white cement concrete.

714.8 CURING AND PROTECTIVE COATING – Add the following:

(a) Curing. Add the following:

Use only form release oil that will not contribute to the discoloration of the white cement concrete. Obtain written assurance from the manufacture that the product does not cause discoloration.

(b) Protective Coating. Add the following:

Anti-graffiti coating to be applied to all exposed surfaces per Item 9000-0001.

714.11 TRANSPORTATION – Add the following:

Place lagging level and as indicated. Provide uniform appearance to exterior face of wall. Repair or replace any damages resulting from transport or installation to the satisfaction of the

Engineer at no cost to the Department.

MEASUREMENT AND PAYMENT – Measured per square foot for the total surface area of the entire front face of the precast concrete lagging panels.

Includes delivery and erection.

ITEM 9000-0012 MAINTENANCE AND PROTECTION OF TRAFFIC

In accordance with Section 901 and as follows:

DESCRIPTION – Add the following:

This work is the furnishing, installing, maintaining and protection of traffic adjacent to and within the Work Zone including the Active Work Zone, and relocating of traffic control devices.

It is the Contractor’s responsibility to develop the Traffic Control Plan. The Traffic Control Plan shall be signed, sealed, and endorsed by a Transportation Professional and submitted to the City for approval.

The contractor is responsible for securing all permits and coordinating with nearby construction activity and events.

CONSTRUCTION – Add the following:

Provide two (2) weeks advance notice to affected municipality, emergency services, City of Pittsburgh Police (412-323-7800), City of Pittsburgh Department of Mobility and Infrastructure (412-255-2597), City of Pittsburgh Department of Public Works (412-255-8850), City of Pittsburgh Public Schools (Administration 412-529-4357), Allegheny County Port Authority, Chuck Rompala (412-566-5321).

Obtain an obstruction permit from the City of Pittsburgh Department of Mobility and Infrastructure, Permits Division as needed.

Outline the Active Work Zone with construction fencing and channelizing devices and obtain approval from the Representative on the layout prior to performing any work.

Maintain traffic on Stanton Avenue at all times. Traffic may be restricted to one lane during construction hours with the approval of the Representative and in accordance with the approved MPT plan. In this case, provide flagging or any other appropriate traffic control device.

McCandless Avenue may require full closure and a short-term detour to accommodate the crane that will set the precast elements. The crane will be located along McCandless Avenue. A detour plan will be submitted in accordance with MUTCD. Once precast elements are set into place, maintain traffic on McCandless Avenue. Traffic may be restricted to one lane during construction hours with the approval of the Representative and in accordance with the approved MPT plan. In this case, provide flagging or any other appropriate traffic control device.

MEASURMENT AND PAYMENT – Lump Sum (LS)

Includes all materials and labor required for the proper installation, maintenance, and removal of all traffic control devices.

ITEM 9203-0101 TEMPORARY EXCAVATION SUPPORT AND PROTECTION SYSTEM

DESCRIPTION – This work is the design and construction of a temporary excavation support and protection system or appropriately designed open cut excavation, as indicated, with a service life of less than or equal to 36 months.

MATERIAL – Provide certification or laboratory test results verifying material properties. For used steel, the salvage design values from AASHTO Guide Design Specification for Bridge Temporary Works (AASHTO Guide Spec) may be used as an alternate to testing to determine grade of steel. Materials need not be new but must be in serviceable condition as determined by the Engineer. Temporary material used does not have to be from a Bulletin 15 source, but must meet the following:

• Structural Steel ...............AASHTO M 270M/270 (ASTM A709M/A709) Grade 250 (Grade 36), Grade 345 (Grade 50) or Grade 345W (Grade 50W)

• Steel Sheet Piling ............ASTM A328M/A328, ASTM A572/A572

• Steel H-Piles....................AASHTO M 270M/270 (ASTM A709M/A709), Grade 250 (Grade 36)

• Wood Lagging .................Rough Cut Species in AASHTO Guide Spec Appendix A and AASHTO Construction Handbook for Bridge Temporary Works Appendix C

• Cement ...........................AASHTO M85 and AASHTO M240

• Pre-Stressing Steel ..........ASTM A416 Grade 270

• Welded Wire Fabric ........AASHTO A55 (ASTM A185)

• Reinforcement Bars ........AASHTO M 31M/31 (ASTM A615M/A615), AASHTO M42M/M42 (ASTM A616M/A616), Grade 420 (Grade 60)

• Other Material ................In accordance with applicable Sections of Publication 408

DESIGN – Design the temporary excavation support and protection system in accordance with current AASHTO LRFD Bridge Design Specifications and Design Manual, Part 4 Specifications, current FHWA guidelines and AASHTO Guide Spec. Design temporary excavation support and protection system for final condition and all construction conditions, including surcharge loads due to vehicle traffic and construction equipment. Submit one set of design calculations and one set of completed detailed drawings, signed and sealed by a Professional Engineer, registered in the Commonwealth of Pennsylvania to the City Representative for review. Include in the design calculations all material properties, design loads, and design assumptions. Include on the completed detailed drawings all design dimensions, limits of work, elevations, material, member sizes and construction sequence. Provide cutoff elevation of steel and wooden components for work in streambed. Include specific installation procedures and testing requirements as part of the submittal. Allow 14 days for the review.

Ensure that temporary excavation support and protection system design and construction conforms to the following:

a) Open cut excavations are allowed, provided they meet OSHA requirements, the safety of the traveling public, the approved traffic control plan and existing structure is assured, and they stay within the legal right-of-way lines. Prior to proposing cuts that extend beyond the legal right-of-way lines, coordinate with City inspection staff to obtain written permission from the affected property owner and ensure environmental compliance. Submit slope stability analysis in accordance with Publication 293.

b) The temporary excavation support and protection system will be selected by the Contractor.

Examples include anchored walls, mechanically stabilized earth walls, prefabricated modular walls, cantilever walls, cofferdams, and soil nailing walls. These systems may be comprised of one or more of the following: Soldier Piles, Timber Lagging, Steel Sheet Piling, Caissons, Slurry Walls, Tiebacks, Soil Nails, Shotcrete, Deadman Anchors, Wales, Cross lot Bracing, Raker Braces, Precast Concrete, Precast Lagging, Soil Cement Lagging, Cement Bentonite, Gabions, Minipiles, Concrete Reaction Blocks, Mechanically Stabilized Earth Walls or other methods.

c) Design temporary excavation support and protection system based on the following parameters:

1. Soil Parameters

1.a Effective angle of friction: 28 degrees

1.b Moist unit weight of soil: 120 PCF

1.c Saturated unit weight of soil: 125 PCF

1.d Effective cohesion: 0

1.e Static groundwater level at elevation: N/A

1.f Undrained shear strength of cohesive soil: 0 PSF

1.g Shear strength for rock mass: 2500 PSF

Provide other soil/rock properties with test data, needed in the design of the temporary excavation support and protection system.

2. Ensure that all components stay within the legal right-of-way unless an easement is obtained by the Contractor.

CONSTRUCTION – Install temporary excavation support and protection system in accordance with applicable sections of Publication 408. Be responsible for adequacy, safety and compliance with Traffic Control Specification. If the design is not compliant with the approved Traffic Control Specification, furnish any additional traffic control devices at no additional cost to the City. All steel and wooden components may remain in place to pavement subgrade or 0.6 meters(2 feet) below finish grade, whichever is higher elevation. Treated wood is not required unless it is within 2 meters(6 feet) of finish grade and is to remain in place. Pressure treat with chromate copper arsenate (CCA) to refusal. Finish grade is defined as top of pavement when a roadway is behind the temporary excavation support and protection system. Have a Professional Engineer, registered in the Commonwealth of Pennsylvania, certify that the temporary excavation support system or open cut excavation has been installed as shown on the Professional Engineer's signed and sealed drawings. Submit the certification to the City Representative within 3 working days of completion of the system.

QUALIFICATIONS – The work must be supervised by a superintendent or foreman who is experienced, in the construction of temporary excavation support and protection system proposed. If the design height of the temporary excavation support and protection system exceeds 6 meters(20 feet), provide the following with the design submission:

For the superintendent or foreman who will supervise the work, submit a list containing at least 5 projects which demonstrate a minimum of 3 years of experience in the construction of the temporary excavation support and protection system proposed. Include a brief description of each project and the name and phone number of the owner's representative knowledgeable in each project listed.

The name of the Professional Engineer, registered in the Commonwealth of Pennsylvania and having at least 3 years of experience in the design and construction of temporary excavation support and protection systems, who will design and specify the sequence of construction of the temporary excavation support and protection of system.

MEASUREMENT AND PAYMENT – Lump Sum (LS)

This item will be measured and paid for in a proportionate manner, designated by the City.

If an acceptable open cut excavation is provided in lieu of the temporary excavation support indicated, payment will be made for the as-bid lump sum temporary excavation support item, but no additional payment will be made for any class of excavation, structure backfill or additional shoring as a result of the open cut excavation or to restore the facilities to their original condition.