S1_S3_Gen_&_Spec_Provs_.pdf

Riverview Avenue Preface to Contract Special Provisions Landslide Remediation Slide S1 & Slide S3 1

PREFACE TO CONTRACT SPECIAL PROVISIONS

Special Provisions for the Riverview Avenue Slide S1 & Slide S3 Landslide Remediation Contract reference the Pennsylvania Department of transportation (PennDOT) Publication 408, 2020 Initial Edition, Effective

October 7, 2022 as located online as follows:

https://www.dot.state.pa.us/public/PubsForms/Publications/Pub_408/408_2020/408_2020_9/408_2020_9.pdf

Section references and specific paragraph references in the Contract Special Provisions correspond to

Publication 408. Notations indicated in the Contract 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 specification govern the work that is to be performed. When the first number begins with a "4", this indicates that the following three numbers refer to a section number and it is being modified. When the first number begins with a "5", this indicates that the following three numbers refer to a section number that begins with a I and it is being modified. When the first four digits of the item number begin with an "8" or "9", the work is governed by the special provision.

Riverview Avenue Description of Work Section 0030

Slide S1 & Slide S3 0030-1

SECTION 0030 - DESCRIPTION OF WORK

The work will consist of construction of geosynthetic reinforced soil (GRS) slope fills with geosynthetic geogrid fabric reinforced backfill to reestablish lateral support in two site locations along the western shoulder of Riverview Avenue due to recent landslides that were eroding in the 26th Ward of the City of Pittsburgh, Pennsylvania. The work involves construction of new geosynthetic reinforced soil (GRS) slope fills with geosynthetic geogrid fabric reinforced backfill, which generally consists of the following tasks:

• Design and implementation of a traffic control plan.

• Construction surveying.

• Installation of compost filter sock.

• Clearing and grubbing within the immediate work area, and guiderail removal.

• Excavation and removal of slide debris.

• Installation of geosynthetic reinforced soil (GRS) slope fill.

• Installation of a drainage inlet, HDPE outlet pipe, and class R-4 rock riprap.

• Preparation of final grading, topsoil, seeding, and mulch.

• Provide plantings/trees.

• Replacement of disturbed asphalt pavement and guiderail installation.

• Furnish pavement markings.

• Site restoration, slope erosion protection, and removal of erosion and sediment pollution controls.

The two sites are approximately 0.3 miles apart, and the work at each site entails:

Riverview Avenue Slide S1 Site - The work includes the construction of an approximately 150-foot long geosynthetic reinforced soil (GRS) slope fill to reestablish lateral support along the western shoulder of Riverview Avenue about 0.2 miles west from the East Entry Garden Of Riverview Park at its intersection with Riverview Avenue in the 26th Ward of the City of Pittsburgh, Pennsylvania. The geosynthetic reinforced soil (GRS) slope fill will be constructed with geosynthetic geogrid fabric reinforced backfill as shown on the plans. This work also includes structural excavation, backfill, geosynthetic geogrid fabric reinforcement, GRS slope fill caution tape, steel wire fabric forms, structure backfill, topsoil, seeding and soil supplements, mulch, and mobilization for the work as shown on the plans and herein. The GRS Slope Fill will have a maximum exposed height of up to 6 feet.

Riverview Avenue Slide S3 Site - The work includes the construction of an approximately 234-foot long geosynthetic reinforced soil (GRS) slope fill to reestablish lateral support along the western shoulder of Riverview Avenue about 0.5 mile west from the East Entry Garden Of Riverview Park at its intersection with Riverview Avenue in the 26th Ward of the City of Pittsburgh, Pennsylvania. The geosynthetic reinforced soil (GRS) slope fill will be constructed with geosynthetic geogrid fabric reinforced backfill as shown on the plans. This work also includes structural excavation, backfill, geosynthetic geogrid fabric reinforcement, GRS slope fill caution tape, steel wire fabric forms, structure backfill, topsoil, seeding and soil supplements, mulch, and mobilization for the work as shown on the plans and herein. The GRS Slope Fill will have a maximum exposed height of up to 8 feet.

Riverview Avenue Description of Work Section 0030

Slide S1 & Slide S3 0030-2

ALL WORK IS TO OCCUR IN ACCORDANCE WITH THE CONTRACT DRAWINGS

AND SPECIFICATIONS. PROJECT IS TO BE BID AS DESIGNED.

ALTERNATIVE METHODS WILL ONLY BE CONSIDERED AFTER THE BID OPENING.

THE CITY OF PITTSBURGH IS NOT OBLIGATED TO ACCEPT ALTERNATIVE

METHODS OR VALUE ENGINEERED SOLUTIONS.

END OF DESCRIPTION OF WORK

Riverview Avenue Control of Materials Section 0106

Slide S1 & Slide S3 0106-1

SECTION 106 - CONTROL OF MATERIALS

In accordance with Section 106 and as follows:

Section 106. 03(b)Responsibility.

Add the following to the first paragraph:

The following table identifies materials for the Project and the party(ies) responsible for sampling and testing, or certification.

Item/Section

And

Material

Quality

Control

Testing by

Contractor

Acceptance

Testing by

Owner/Owner’s

Representative

Certification By

Manufacturer

Coarse Aggregate X X

Rock X X

Geotextile X

Geogrid Membrane X

Bituminous Tack Coat X X

Superpave Asphalt Concrete Base Course X X

Superpave Asphalt Concrete Wearing Course X X

Superpave Asphalt Concrete Binder Course X X

Guide Rail X

Topsoil X X

Seeding and Soil Supplements *

Mulching - Hay X

Inlet Sediment Filter Bag X

Compost Filter Sock X

Traffic Control Signs X

* Certification by the Pennsylvania Department of Agriculture, Bureau of Plant Industry.

Include costs for tests and certifications in the bid price for the bid items on the Schedule of Prices.

Provide a copy of each certification for each item requiring certification to the City's representative at the time of material delivery to the site, and one (1) copy of each certification for each item to the Owner's Engineer for approval at least 2 weeks prior to delivery of material to the site.

END OF SPECIAL PROVISION

Riverview Avenue Legal Relations and Responsibility to the Public Section 107

Slide S1 & Slide S3 107-1

SECTION 107 - LEGAL RELATIONS AND RESPONSIBILTY TO THE PUBLIC

In accordance with Section 107 and as follows:

Section 107. 02(a) Permits and Licenses.

Add the following:

City of Pittsburgh Permit Acquisition.

The Contractor shall use the following procedure for acquiring General Permits for City of Pittsburgh (City) projects. Permit fee waivers for City projects must be authorized by the DOMI project manager prior to permit application. Requests for General Permits for City projects should be made by email to Mike Salem and Sergey Brodskiy.

Applicable contact information:

Mike Salem: mike.salem@pittsburghpa.gov

Sergey Brodskiy: sergey.brodskiy@pittsburghpa.gov

Plan construction activities, as necessary, to accommodate the time required for permit processing. The minimum time required for permit processing is 3 business days. Large jobs, especially those with maintenance and protection of traffic, are encouraged to submit traffic control plans to Sergey Brodskiy in advance. The request can be made directly by the City project manager (preferred method) or by the contractor with the City project manager included on the email. If the request comes from the contractor, the City project manager must respond to the email to confirm the project is a city job.

Requests for General Permits for City projects using these methods must include the following:

• Applicant - DOMI project manager name, email address, and phone number.

• Description of work

• Location of work. Use as much detail as possible (i.e. address, corridor, etc.)

• Contractor(s) to be listed on the permit. Indicate a primary contractor if multiple contractors are required.

• Contractor foreman name, email address, and phone number.

• Work start date and anticipated end date.

• Traffic obstruction description including closure requests, PATA's and/or MPT plans.

Attach any plans if applicable.

• Attach applicable project plans.

END OF SECTION

Riverview Avenue Performance and Progress Section 108

Slide S1 & Slide S3 108-1

SECTION 108 - PERFORMANCE AND PROGRESS

In accordance with Section 108 and as follows:

Section 108. 02(a) Requirements for Starting Work.

Add the following:

Provide a minimum of two weeks advance notice and coordination prior to start of work with City representatives. Notify the following City representatives:

a) City Forester, Lisa Ceoffe at lisa.ceoffe@Pittsburghpa.gov

b) Utility and Right of Way Supervisor, Brian Ralston at brian.ralston@pittsburghpa.gov

c) Superintendent DPW, Tom Paulin at tom.paulin@pittsburghpa.gov

d) City Traffic Engineer, Mike Maloch at michael.maloch@pittsburghpa.gov

END OF SECTION

chernoa Text Box joe.rush@pittsburghpa.gov chernoa Text Box Joe Rush

Riverview Avenue Aggregates Section 703

Slide S1 & Slide S3 703-1

SECTION 703

AGGREGATES

In accordance with Section 703 and as follows:

703.2 COARSE AGGREGATE

Revise as follows:

703.2(a) 3. Blast Furnace Slag.

Delete.

703.2(a)4. Steel Slag.

703.2(a)S. Granulated Slag.

703.2(a)7. Recycled Concrete.

Revise to read as follows:

Salvaged and crushed concrete pavements and concrete structures for use as aggregate in embankment construction and filling. Provide recycled concrete conforming to Table Band Table C, except soundness testing is not required. Contractor shall provide evidence of conformance with the PADEP Management of Fill Policy (#258-2182-773) by completing Form FP-OOI - Certification of Clean Fill or equivalent verification approved by the Representative.

703.2(b). Production Testing.

Section 703.3(a). General.

Delete the words "or slag" in the first sentence

Riverview Avenue Clearing and Grubbing, Modified Item 4201-0001

Slide S1 & Slide S3 703-1

ITEM 4201-0001

CLEARING AND GRUBBING, MODIFIED

In accordance with Section 201 and as follows:

201.1 DESCRIPTION - Revise to read as follows:

This work is:

• Removal of topsoil and organic matter such as trees, stumps, brush, roots, and other vegetation within the limits of grading, including ditches and channels. When indicated, perform tree trimming and selective tree removal outside of the limits of grading as specified in Section 810.

• Removal of objectionable material, rubbish, and junk within the project limits.

• Removal of structures, fences, walls, guide rail posts, guide rails, signs, direction markers, and other obstructions interfering with the work.

• Resetting of signs, including temporary storage and delivery.

• Disposal of removed material.

• Salvaging, temporarily storing, and delivering of material.

• Obtaining of waste areas for disposal of material as specified in Section 105.14.

• Stockpiling of topsoil mixture as specified in Section 801.

201.3 CONSTRUCTION - Add the following:

Complete clearing before beginning other work within the work area.

Do not damage trees beyond the work limits. Trim tree branches that interfere with construction work. Treat wounds as specified in Section 81O.3(c).

Do not dump on site.

Riverview Avenue Subbase 6” Depth (No. 2A), Modified Item 4350-0106

Slide S1 & Slide S3 4350-1

ITEM 4350-0106

SUBBASE 6" DEPTH (NO. 2A), MODIFIED

Section 350.2(a) Aggregates

Add the following to the first sentence:

excluding slag.

Section 350.2(a) Aggregates

Add the following:

Perform quality control testing in accordance with Section 703 at the source and perform acceptance sampling under the direction of Inspector at point of placement at the job site.

Riverview Avenue Inspectors Field Office and Inspection Facilities, Type C , Modified Item 4609-0004

Slide S1 & Slide S3 4609-1

ITEM 4609-0004

INSPECTOR'S FIELD OFFICE AND INSPECTION FACILITIES, TYPE C, MODIFIED

In Accordance with Section 690 and as follows

Section 609.2(c) Communications Equipment - Delete the following items:

1. High Capacity Multifunction Device (MFD): Copier, Scanner, Fax, and Printer.

3. Cellular Phone.

Section 609 TABLE A - Delete the following items from TABLE A

• Individual Access Phone Line(s)

• Telephone(s) with Answering Machine(s) or Voice Mail

Riverview Avenue Type 31S Guide Rail , Modified Item 4620-1600

Slide S1 & Slide S3 4620-1

ITEM 4620-1600

TYPE 31-S GUIDE RAIL, MODIFIED

In Accordance with Section 620 and as follows

Section 620.2(b) Other Material. – Add the following items:

• No. 2A Coarse Aggregate – Section 703.2

• Polyvinyl Chloride Pipe Sleeve – Section 601.2.6.a.2.

Riverview Avenue Plants, Planting, and Transplanting, As Directed Item 4808-0001

Slide S1 & Slide S3 4808-1

ITEM 4808-0001

PLANTS, PLANTING, AND TRANSPLANTING, AS DIRECTED

In accordance with Section 808 and as follows:

808.1 DESCRIPTION - Revise to read as follows:

808.1 DESCRIPTION - This work is the furnishing, planting, and transplanting of trees, shrubs, vines, live stakes and other woody or herbaceous plants, and includes shrub-bed preparation, as directed.

808.4 MEASUREMENT AND PAYMENT - Revise to read as follows:

808.4 MEASUREMENT AND PAYMENT - Dollar

The proposal will include an item and a predetermined amount of money for Plants, Planting, And Transplanting, As Directed. 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, the provisions of Section 110.02(d) are not applicable to this item.

Measured and paid for, under the Plants, Planting, And Transplanting, As Directed item as follows:

(a) Contract Items. The Department will pay for performance of work, identified as having similar items listed in the contract, at the contract unit price.

(b) Non-Contract Items. The Department will pay for items of work not identified in the contract as follows:

1. Negotiated Price. At price agreed upon with the Department before performing the work.

2. Force Account Basis. Section 110.03(d)

Riverview Avenue Maintenance and Protection of Traffic During Construction Item 4901-0001

Slide S1 & Slide S3 4901-1

ITEM 4901-0001

MAINTENANCE AND PROTECTION OF TRAFFIC DURING CONSTRUCTION

In accordance with Section 901 and as follows:

901.1 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.

Detouring motorized and shifting pedestrian traffic in accordance with the construction plan, PennDOT Publication 213, and as approved by the City is acceptable. This work includes paving of the shoulder or placement of compacted aggregate, if required by the MPT Plan, to allow for traffic flow around the Work Zone.

It is the Contractor's responsibility to develop the Traffic Control Plan. The Traffic Control Plan Shall be submitted to the City for approval. The contractor is responsible for securing all permits and coordinating with nearby construction activity and events.

901.3 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). Also provide advance notice to PennDOT, as required.

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.

901.4 MEASUREMENT AND PAYMENT - Revise as follows:

(a) Maintenance and Protection of Traffic During Construction. Lump Sum

The Department will measure and pay for this item in a proportionate manner based on current estimates. If an item or device is required for maintenance and protection of traffic, the cost of the item or device is incidental. The cost of temporarily widening the roadway by paving or placement of compacted aggregate of the shoulder is incidental to implementation of the MPT plan.

(b) Design MPT. Item 9000-0001

Riverview Avenue Design Maintenance and Protection of Traffic Item 9000-0002

Slide S1 & Slide S3 9000-0002-1

ITEM 9000-0002

DESIGN MAINTENANCE AND PROTECTION OF TRAFFIC

DESCRIPTION - This work is the design and plan preparation for required maintenance and protection of the traveling public approaching the construction area and within the limits of construction.

DESIGN –

(a) General. Design, prepare, and submit Maintenance and Protection of Traffic Control

Plans. The submittal must comply with Pennsylvania Department of Transportation

(PennDOT) Design Manuals for presentation and must be signed by a registered

Professional Engineer by the Commonwealth of Pennsylvania. The Department (City

DOMI) will review the plans and either approve or return comments within review times as defined in Section (c)2 of this specification.

Designer Qualifications - Have the design completed by a Professional Engineer licensed in the Commonwealth of Pennsylvania and according to the "Design Activities

Qualifications and Requirements".

(b) Design Specifications. Design a Traffic Control Plan (TCP) in accordance with the most current edition of all PennDOT Standards, Specifications, and Regulations. These include, but are not limited to the following:

• Temporary Traffic Control Guidelines, (PennDOT Publication 213)

• Design Manual Parts 2 & 3 (PennDOT Publication 13M and 14M)

• Design Manual Part 1, (PennDOT Publication 10C, Chapter 3, Section

3.3.B.13 on pgs. 3-27 to 3-33, esp. Figure 3.1)

• Specifications, PennDOT Publication 408/2011

• Traffic Signing Standards TC-8600 / TC-8700 (PennDOT Publication 111M)

• Handbook of Approved Signs (PennDOT Publication 236M)

• Pa Code Title 67, Chapter 212, Official Traffic Control Devices

• MUTCD Manual on Uniform Traffic Control Devices (FHWA)

• Traffic Engineering Manual, (PennDOT Publication 46)

(c) Design Requirements.

1. Maintenance of Traffic During Construction. Design traffic control plan(s) to minimize impacts to traffic when bringing equipment and materials in and out of the project area. Maintain roadway closure of the areas at Slide S1 and Slide S3 to traffic for the duration of the project. The roadway between Slide S1 and Slide

S3 areas should allow one lane open to traffic for the duration of the project.

Short-term traffic stoppages shall be limited to 15 minutes unless otherwise approved by the City.

This work also consists of the maintenance and protection of pedestrians approaching the construction area and within the limits of construction. The safety for pedestrians must be maintained at all times.

Riverview Avenue Design Maintenance and Protection of Traffic Item 9000-0002

Slide S1 & Slide S3 9000-0002-2

2. Submissions. Electronic submissions in PDF file format are acceptable. The plan will include the following review times for each submission:

a. Preliminary Submission. Fifteen (15) working days.

b. Final Submission. Fifteen (15) working days.

c. Revised Traffic Control Plan Submissions. Prepare and submit a revised

Traffic Control Plan for any proposed modification to the original approved plan. Submit the revised plan for review and approval at least fifteen (15) days prior to the implementation of the proposed modifications.

If a submission is incomplete or otherwise requires additional information or data to properly complete the review, the review time will begin as specified for the submission when all required information is received. Additional contract time or price adjustment to any contract items will not be considered due to failure to obtain approvals within the specified review times resulting from incomplete or non-conforming submissions. Working days are weekdays, Monday through

Friday.

The following official Department holidays will not be included as working days:

New Year's Day, Dr. Martin Luther King, Jr. Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Veteran's Day, Thanksgiving Day, Day after Thanksgiving Day, and Christmas Day.

MEASUREMENT AND PAYMENT –

(a) Design MPT. Lump Sum

Payment for the design of the Traffic Control Plan will be made based on the following schedule:

Initial Submission – 15%

Final Plan Approval – 70%

Revisions During Construction – 15%

(b) Maintenance and Protection of Traffic During Construction. Item 4901-0001

Riverview Avenue Geosynthetic Reinforced Soil (GRS) Slope Fill – Slide S1 Item 9094-0001

Slide S1 & Slide S3 9094-1

ITEM 9094-0001 – GEOSYNTHETIC REINFORCED SOIL (GRS) SLOPE FILL – SLIDE S1

9094.1 DESCRIPTION - This work covers the construction of geosynthetic reinforced soil (GRS) slope fill consisting of geosynthetic geogrid fabric reinforced backfill as shown on the plans. This work also includes structural excavation, backfill, geosynthetic geogrid fabric reinforcement, GRS slope fill caution tape, steel wire fabric forms, structure backfill, topsoil, seeding and soil supplements, mulch, and mobilization for the work as shown on the plans and herein.

9094.2 MATERIAL -

(a) Geosynthetic Geogrid Fabric Reinforcement - High tenacity polyester multi-filament yarn, which are woven in tension and finished with a PVC coating meeting the requirements of Miragrid 2XT Geogrid Fabric Reinforcement as manufactured by Tencate Geosynthetics, Inc., Pendergrass, GA or an approved equal with the following tensile properties:

Tensile property

Test method

Min average roll value

(lbs/ft)

Ultimate tensile strength ASTM D6637 1,298

Tensile strength at 5% strain ASTM D6637 520

Creep limited strength ASTM D5262 1,597

Long term design strength * 1,383

* GRI-GG4(b), “Determination of the Long-Term Design Strengths of Flexible

Geogrids”

(b) Select Borrow Excavation Coarse Aggregate No. 57 reinforced fill material –

Section 703.2 with a minimum internal friction angle (Ø) = 36 degrees.

(c) Embankment Material – Section 206.2(a)

(d) Select Borrow Excavation Coarse Aggregate No. 1 – Section 703.2

(e) Select Borrow Excavation Structure Backfill – Section 1001.2(i)

(f) Geotextile, Class 4, Type A – Section 735

(g) Corrosion Resistant Steel Wire Fabric Forms - Forms shall consist of galvanized

4 x 4 steel welded wire fabric W4 x W4 formed to a 90 degree “L” with a minimum length of 10 feet and in accordance with Section 709.3

(h) Turf Reinforcement Mat – Section 806.2

(i) Top Soil, Furnished and Placed - Fertile soil as specified in Section 206.2(a)1.a, except that it must have greater than 25% passing the 75 μm (No. 200) sieve. Soil

Slide S1 & Slide S3 9094-2 must be capable of supporting and maintaining plant growth. Unless otherwise indicated for special plantings (e.g. wetlands), provide soils within a pH range of

5.5 to 7.5 determined according to AASHTO T 289.

(a) Seeding and Soil Supplements - Section 804.2(b), Native Steep Slope Mix with

Grain Rye Seed Formula with the following requirements:

Formula and Species % By

Weight

Minimum % Max

Weed

Seed

Seeding Rate lb./1000 yd2

(lb./acre) Purity Germination

Native Steep Slope Mix w/Grain Rye

15 (75) Total

Rye, Variety Not Stated (Secale cereale, Variety Not Stated)

40.00 97 85 0.1 6 (30)

Big Bluestem, 'Southlow'-MI

Ecotype (Andropogon gerardii, 'Southlow'-MI Ecotype)

19.12 85 70 0.2 2.87 (14.34)

Virginia Wildrye, Madison-NY

Ecotype (Elymus virginicus, Madison-NY Ecotype)

16.48 85 70 0.2 2.47 (12.36)

Indiangrass, PA Ecotype

(Sorghastrum nutans, PA

Ecotype)

12.00 85 70 0.2 1.8 (9)

Switchgrass, Shawnee’

(Panicum Virgatum, Shawnee’)

3.84 - - - 0.58 (2.88)

Winter Bentgrass, Piedmont NC

Ecotype (Agrostis hyemalis, Piedmont NC Ecotype)

3.20 - - - 0.48 (2.4)

Deertongue, Tioga (Panicum clandestinum, Tioga)

2.24 - - - 0.34 (1.68)

Blackeyed Susan (Rudbeckia hirta)

0.80 - - - 0.12 (0.6)

Lanceleaf Coreopsis (Coreopsis lanceolata)

0.56 - - - 0.08 (0.42)

Purple Coneflower (Echinacea purpurea)

0.56 - - - 0.08 (0.42)

Oxeye Sunflower, PA Ecotype

(Heliopsis helianthoides, PA

Ecotype)

0.56 - - - 0.08 (0.42)

Heath Aster, PA Ecotype (Aster pilosis, PA Ecotype)

0.16 - - - 0.02 (0.12)

Wild Bergamot (Monarda fistulosa)

0.16 - - - 0.02 (0.12)

Wrinkleleaf Goldenrod, PA

Ecotype (Solidago rugosa, PA

Ecotype)

0.16 - - - 0.02 (0.12)

Indianhemp, PA Ecotype

(Apocynum cannabinum, PA

Ecotype)

0.08 - - - 0.01 (0.06)

Common Milkweed (Asclepias syriaca)

0.08 - - - 0.01 (0.06)

(b) Mulching - Section 805.2(a).1.e, Bonded Fiber Matrix (BFM)

Slide S1 & Slide S3 9094-3

(c) Construction Surveying, Type B – Section 686.2

(d) Mobilization – Section 608.2

(e) GRS Slope Fill Caution Tape - GRS slope fill caution tape is to have a minimum thickness of 4 mils, be non-degradable in alkaline and acidic soils, be white in color and be customizable detectable underground warning tape. The GRS slope fill caution tape must use black permanent ink lettering that is at least 1” tall and center aligned in the tape to display the message as shown below:

a. 3" MINIMUM STOP DIGGING – GEOSYNTHETIC REINFORCED SOIL

SLOPE FILL – CALL GRS SLOPE FILL OWNER CITY OF

PITTSBURGH DEPARTMENT OF MOBILITY AND

INFRASTRUCTURE.

9094.3 CONSTRUCTION -

(a) General. Prior to beginning work, submit to the Engineer a construction sequence and scheme including the information specified below. Do not proceed with work until approval of the construction sequence and scheme is given. Include the following information:

1. Construction sequence and scheme showing method and sequence of assembly of the geosynthetic reinforced fill, including removal of existing guide railing, walls/structures, excavation, temporary bracing of excavation, protection/relocation of affected utilities/structures, installation of geosynthetic geogrid fabric reinforcement, steel wire fabric forms, and placement geosynthetic geogrid fabric reinforcement and backfill.

2. Details and computations for temporary shoring.

3. Deviations or proposed alternate details in lieu of details indicated or specified herein.

(b) The Contractor shall stakeout the geosynthetic reinforced fill location prior to commencement of any excavation in accordance with Construction Surveying, Type B in PENNDOT 408/2020 Section 686.3(e). Geosynthetic reinforced fill locations shall be adjusted in the field to fit actual site conditions, subject to approval of the Department. The Contractor shall establish work points by field survey to establish the location of all wall components by station, offset distance and ground surface elevation using project survey control. The Contractor shall not commence any excavation prior to approval of the Geosynthetic-Reinforced

Fill Stakeout Plan by the Engineer.

(c) The Contractor shall remove and dispose existing guide rail inside the right-of-

Slide S1 & Slide S3 9094-4 way in accordance with Section 620.3(c).

(d) Where existing retaining structures coincide with proposed geosynthetic reinforced fill location, the Contractor shall remove and properly dispose of the existing walls as required for geosynthetic reinforced fill construction. Staged construction, submitted by the Contractor as indicated in 9094.3(a), and approved by the Engineer, whereby intermittent portions of an existing wall are removed, leaving other sections intact to provide temporary support, may be permitted with submittal and approval, by the Engineer, of proper analysis/calculations provided by the Contractor. The Contractor shall, for all excavations, provide temporary shoring and bracing, as required to maintain adequate support to prevent ground sloughing, movement, collapse, and distresses to adjacent pavements, structures, utilities, and properties; or calculations, per Section 9094.3(a), indicating short-term stability of limited unsupported cuts/excavations at specific areas. Any distresses resulting from temporary shoring, or cuts/excavations, shall be remediated by the Contractor to the satisfaction of the structure/utility/pavement owner, at his own expense and at no expense to the County.

(e) Excavate lines and grades indicated for installation of the geosynthetic reinforced soil slope fill. Excavate in accordance with Section 204 for Class 3 excavation.

Install temporary excavation support, where required. Provide temporary support for and protect all structures and utilities near excavations in accordance with

Section 105 and 9094.3(b).

(f) GRS Slope Fill. Construct the GRS Slope Fill in accordance with the requirements of Section 206.3 with materials obtained for the various classes of material as shown on the contract plans and indicated herein.

1. Place GRS Slope Fill in maximum 6" lifts. All aggregate and granular backfill shall be compacted to at least 95 percent relative density as defined by American Society for Testing and Materials Test Designations: D4253-93 and 4254-91.

2. Geotextile, Class 4, Type A. Place Geotextile Class 4, Type A to the limits indicated and at a time specified in approved construction sequence.

3. Select Borrow Excavation, Course Aggregate No. 57. Place AASHTO No.

57 coarse aggregate backfill between the layers of the geosynthetic geogrid fabric reinforcement fill to the limits indicated. Place backfill at a time specified in approved construction sequence.

4. Place geosynthetic geogrid fabric reinforcement horizontally on compacted fill; connect the geogrid membrane to the steel wire fabric forms and pull and anchor taught before fill is placed on the geosynthetic geogrid fabric reinforcement.

Slide S1 & Slide S3 9094-5

a. Slack in geosynthetic geogrid fabric reinforcement shall be removed in a manner and to such a degree as approved by the engineer.

b. Store, handle and install geosynthetic geogrid fabric reinforcement in accordance with the manufacturer’s instructions and guidelines.

5. Place GRS Slope Fill caution tape at the elevation of the top layer of geosynthetic reinforcement incidental to the placement of geosynthetic geogrid fabric reinforcement . The top layer of geosynthetic reinforcement may be either primary or secondary reinforcement. Place caution tape at the spacing shown. The primary layer of caution tape is placed in strips at 4 foot centers perpendicular to the slope face (in the same direction as primary geosynthetic reinforcement). A secondary layer of caution tape is placed at

10 foot centers perpendicular to the direction of primary geosynthetic reinforcement. Extend caution tape beyond the limits of the GRS slope fill to the limits shown.

6. Place GRS Slope Fill to the limits indicated as shown on the plans. Place

GRS Slope Fill in accordance with Section 206.3 and at a time specified in approved construction sequence.

(g) As directed during construction, provide measures to correct or abate unforeseen construction conditions. These measures are separate from those features designed for the project.

9094.4 MEASUREMENT AND PAYMENT - Lump Sum

(a) General. All items of work as indicated in the component item schedule are to be included in and paid for as part of the contract lump sum price, except as indicated otherwise herein.

(b) Successful bidder shall submit a Component Item Schedule as specified in Section

103.01(a) except that it is to be submitted to the City of Pittsburgh Department of

Mobility and Infrastructure. Make the total at the end of the Component Item Schedule equal to the lump sum price shown for the Geosynthetic Reinforced Soil (GRS) Slope

Fill.

Slide S1 & Slide S3 9094-6

BID COMPONENT ITEM SCHEDULE

FOR ITEM 9094-0001

RIVERVIEW AVENUE LANDSLIDE REMEDIATION – SLIDE S1 PROJECT

(REQUIRED POST-BID SUBMISSION)

COMPONENT ITEM SCHEDULE

GEOSYNTHETIC REINFORCED SOIL (GRS) SLOPE FILL – SLIDE S1

ITEM NO. ITEM UNIT QTY

UNIT PRICE

DOLLAR CENT

TOTAL

DOLLAR CENT

9094-0001 Geosynthetic Reinforced Soil

(GRS) Slope Fill – Slide S1

LS 1

1(1) Class 3 Excavation CY 120

2(1) Selected Borrow Excavation Coarse

Aggregate, No.57

CY 240

3(1) Secondary Geotextile, Class 4, Type A Reinforcement

SY 740

4(1) Primary Geosynthetic Geogrid

Fabric Reinforcement

SY 550

5(1) Corrosion Resistant Steel Wire

Forms

LB 900

6(1) Turf Reinforcement Mat SY 75

7(1) Select Borrow Excavation, Structure Backfill

CY 100

8(1) Topsoil, Furnished and Placed CY 70

9(1)

Seeding And Soil Supplements, Native Steep Slope Mix with Grain

Rye Seed Formula, Including

Mulch

LB 3

(1)

Items in Geosynthetic Reinforced Soil (GRS) Slope Fill – Slide S1 Lump Sum Item 9094-0001

Given For Information Only.

Riverview Avenue Geosynthetic Reinforced Soil (GRS) Slope Fill – Slide S3 Item 9094-0002

Slide S1 & Slide S3 9094-1

ITEM 9094-0002 – GEOSYNTHETIC REINFORCED SOIL (GRS) SLOPE FILL – SLIDE S3

9094.1 DESCRIPTION - This work covers the construction of geosynthetic reinforced soil (GRS) slope fill consisting of geosynthetic geogrid fabric reinforced backfill as shown on the plans. This work also includes structural excavation, backfill, geosynthetic geogrid fabric reinforcement, GRS slope fill caution tape, steel wire fabric forms, structure backfill, topsoil, seeding and soil supplements, mulch, and mobilization for the work as shown on the plans and herein.

9094.2 MATERIAL -

(a) Geosynthetic Geogrid Fabric Reinforcement - High tenacity polyester multi-filament yarn, which are woven in tension and finished with a PVC coating meeting the requirements of Miragrid 5XT Geogrid Fabric Reinforcement as manufactured by Tencate Geosynthetics, Inc., Pendergrass, GA or an approved equal with the following tensile properties:

Tensile property

Test method

Min average roll value

(lbs/ft)

Ultimate tensile strength ASTM D6637 3,245

Tensile strength at 5% strain ASTM D6637 1,300

Creep limited strength ASTM D5262 3,264

Long term design strength * 2,826

* GRI-GG4(b), “Determination of the Long-Term Design Strengths of Flexible

Geogrids”

(b) Select Borrow Excavation Coarse Aggregate No. 57 reinforced fill material –

Section 703.2 with a minimum internal friction angle (Ø) = 36 degrees.

(c) Embankment Material – Section 206.2(a)

(d) Select Borrow Excavation Coarse Aggregate No. 1 – Section 703.2

(e) Select Borrow Excavation Structure Backfill – Section 1001.2(i)

(f) Geotextile, Class 4, Type A – Section 735

(g) Corrosion Resistant Steel Wire Fabric Forms - Forms shall consist of galvanized

4 x 4 steel welded wire fabric W4 x W4 formed to a 90 degree “L” with a minimum length of 10 feet and in accordance with Section 709.3

(h) Turf Reinforcement Mat – Section 806.2

(i) Top Soil, Furnished and Placed - Fertile soil as specified in Section 206.2(a)1.a, except that it must have greater than 25% passing the 75 μm (No. 200) sieve. Soil

Slide S1 & Slide S3 9094-2 must be capable of supporting and maintaining plant growth. Unless otherwise indicated for special plantings (e.g. wetlands), provide soils within a pH range of

5.5 to 7.5 determined according to AASHTO T 289.

(j) Seeding and Soil Supplements - Section 804.2(b), Native Steep Slope Mix with

Grain Rye Seed Formula with the following requirements:

Formula and Species % By

Weight

Minimum % Max

Weed

Seed

Seeding Rate lb./1000 yd2

(lb./acre) Purity Germination

Native Steep Slope Mix w/Grain Rye

15 (75) Total

Rye, Variety Not Stated (Secale cereale, Variety Not Stated)

40.00 97 85 0.1 6 (30)

Big Bluestem, 'Southlow'-MI

Ecotype (Andropogon gerardii, 'Southlow'-MI Ecotype)

19.12 85 70 0.2 2.87 (14.34)

Virginia Wildrye, Madison-NY

Ecotype (Elymus virginicus, Madison-NY Ecotype)

16.48 85 70 0.2 2.47 (12.36)

Indiangrass, PA Ecotype

(Sorghastrum nutans, PA

Ecotype)

12.00 85 70 0.2 1.8 (9)

Switchgrass, Shawnee’

(Panicum Virgatum, Shawnee’)

3.84 - - - 0.58 (2.88)

Winter Bentgrass, Piedmont NC

Ecotype (Agrostis hyemalis, Piedmont NC Ecotype)

3.20 - - - 0.48 (2.4)

Deertongue, Tioga (Panicum clandestinum, Tioga)

2.24 - - - 0.34 (1.68)

Blackeyed Susan (Rudbeckia hirta)

0.80 - - - 0.12 (0.6)

Lanceleaf Coreopsis (Coreopsis lanceolata)

0.56 - - - 0.08 (0.42)

Purple Coneflower (Echinacea purpurea)

0.56 - - - 0.08 (0.42)

Oxeye Sunflower, PA Ecotype

(Heliopsis helianthoides, PA

Ecotype)

0.56 - - - 0.08 (0.42)

Heath Aster, PA Ecotype (Aster pilosis, PA Ecotype)

0.16 - - - 0.02 (0.12)

Wild Bergamot (Monarda fistulosa)

0.16 - - - 0.02 (0.12)

Wrinkleleaf Goldenrod, PA

Ecotype (Solidago rugosa, PA

Ecotype)

0.16 - - - 0.02 (0.12)

Indianhemp, PA Ecotype

(Apocynum cannabinum, PA

Ecotype)

0.08 - - - 0.01 (0.06)

Common Milkweed (Asclepias syriaca)

0.08 - - - 0.01 (0.06)

(k) Mulching - Section 805.2(a).1.e, Bonded Fiber Matrix (BFM)

Slide S1 & Slide S3 9094-3

(l) Construction Surveying, Type B – Section 686.2

(m) Mobilization – Section 608.2

(n) GRS Slope Fill Caution Tape - GRS slope fill caution tape is to have a minimum thickness of 4 mils, be non-degradable in alkaline and acidic soils, be white in color and be customizable detectable underground warning tape. The GRS slope fill caution tape must use black permanent ink lettering that is at least 1” tall and center aligned in the tape to display the message as shown below:

a. 3" MINIMUM STOP DIGGING – GEOSYNTHETIC REINFORCED SOIL

SLOPE FILL – CALL GRS SLOPE FILL OWNER CITY OF

PITTSBURGH DEPARTMENT OF MOBILITY AND

INFRASTRUCTURE.

9094.3 CONSTRUCTION -

(a) General. Prior to beginning work, submit to the Engineer a construction sequence and scheme including the information specified below. Do not proceed with work until approval of the construction sequence and scheme is given. Include the following information:

1. Construction sequence and scheme showing method and sequence of assembly of the geosynthetic reinforced fill, including removal of existing guide railing, walls/structures, excavation, temporary bracing of excavation, protection/relocation of affected utilities/structures, installation of geosynthetic geogrid fabric reinforcement, steel wire fabric forms, and placement geosynthetic geogrid fabric reinforcement and backfill.

2. Details and computations for temporary shoring.

3. Deviations or proposed alternate details in lieu of details indicated or specified herein.

(b) The Contractor shall stakeout the geosynthetic reinforced fill location prior to commencement of any excavation in accordance with Construction Surveying, Type B in PENNDOT 408/2020 Section 686.3(e). Geosynthetic reinforced fill locations shall be adjusted in the field to fit actual site conditions, subject to approval of the Department. The Contractor shall establish work points by field survey to establish the location of all wall components by station, offset distance and ground surface elevation using project survey control. The Contractor shall not commence any excavation prior to approval of the Geosynthetic-Reinforced

Fill Stakeout Plan by the Engineer.

(c) The Contractor shall remove and dispose existing guide rail inside the right-of-

Slide S1 & Slide S3 9094-4 way in accordance with Section 620.3(c).

(d) Where existing retaining structures coincide with proposed geosynthetic reinforced fill location, the Contractor shall remove and properly dispose of the existing walls as required for geosynthetic reinforced fill construction. Staged construction, submitted by the Contractor as indicated in 9094.3(a), and approved by the Engineer, whereby intermittent portions of an existing wall are removed, leaving other sections intact to provide temporary support, may be permitted with submittal and approval, by the Engineer, of proper analysis/calculations provided by the Contractor. The Contractor shall, for all excavations, provide temporary shoring and bracing, as required to maintain adequate support to prevent ground sloughing, movement, collapse, and distresses to adjacent pavements, structures, utilities, and properties; or calculations, per Section 9094.3(a), indicating short-term stability of limited unsupported cuts/excavations at specific areas. Any distresses resulting from temporary shoring, or cuts/excavations, shall be remediated by the Contractor to the satisfaction of the structure/utility/pavement owner, at his own expense and at no expense to the County.

(e) Excavate lines and grades indicated for installation of the geosynthetic reinforced soil slope fill. Excavate in accordance with Section 204 for Class 3 excavation.

Install temporary excavation support, where required. Provide temporary support for and protect all structures and utilities near excavations in accordance with

Section 105 and 9094.3(b).

(f) GRS Slope Fill. Construct the GRS Slope Fill in accordance with the requirements of Section 206.3 with materials obtained for the various classes of material as shown on the contract plans and indicated herein.

1. Place GRS Slope Fill in maximum 6" lifts. All aggregate and granular backfill shall be compacted to at least 95 percent relative density as defined by American Society for Testing and Materials Test Designations: D4253-93 and 4254-91.

2. Geotextile, Class 4, Type A. Place Geotextile Class 4, Type A to the limits indicated and at a time specified in approved construction sequence.

3. Select Borrow Excavation, Course Aggregate No. 57. Place AASHTO No.

57 coarse aggregate backfill between the layers of the geosynthetic geogrid fabric reinforcement fill to the limits indicated. Place backfill at a time specified in approved construction sequence.

4. Place geosynthetic geogrid fabric reinforcement horizontally on compacted fill; connect the geogrid membrane to the steel wire fabric forms and pull and anchor taught before fill is placed on the geosynthetic geogrid fabric reinforcement.

Slide S1 & Slide S3 9094-5

a. Slack in geosynthetic geogrid fabric reinforcement shall be removed in a manner and to such a degree as approved by the engineer.

b. Store, handle and install geosynthetic geogrid fabric reinforcement in accordance with the manufacturer’s instructions and guidelines.

5. Place GRS Slope Fill caution tape at the elevation of the top layer of geosynthetic reinforcement incidental to the placement of geosynthetic geogrid fabric reinforcement . The top layer of geosynthetic reinforcement may be either primary or secondary reinforcement. Place caution tape at the spacing shown. The primary layer of caution tape is placed in strips at 4 foot centers perpendicular to the slope face (in the same direction as primary geosynthetic reinforcement). A secondary layer of caution tape is placed at

10 foot centers perpendicular to the direction of primary geosynthetic reinforcement. Extend caution tape beyond the limits of the GRS slope fill to the limits shown.

6. Place GRS Slope Fill to the limits indicated as shown on the plans. Place

GRS Slope Fill in accordance with Section 206.3 and at a time specified in approved construction sequence.

(g) As directed during construction, provide measures to correct or abate unforeseen construction conditions. These measures are separate from those features designed for the project.

9094.4 MEASUREMENT AND PAYMENT - Lump Sum

(a) General. All items of work as indicated in the component item schedule are to be included in and paid for as part of the contract lump sum price, except as indicated otherwise herein.

(b) Successful bidder shall submit a Component Item Schedule as specified in Section

103.01(a) except that it is to be submitted to the City of Pittsburgh Department of

Mobility and Infrastructure. Make the total at the end of the Component Item Schedule equal to the lump sum price shown for the Geosynthetic Reinforced Soil (GRS) Slope

Fill.

Slide S1 & Slide S3 9094-6

BID COMPONENT ITEM SCHEDULE

FOR ITEM 9094-0002

RIVERVIEW AVENUE LANDSLIDE REMEDIATION – SLIDE S3 PROJECT

(REQUIRED POST-BID SUBMISSION)

COMPONENT ITEM SCHEDULE

GEOSYNTHETIC REINFORCED SOIL (GRS) SLOPE FILL – SLIDE S3

ITEM NO. ITEM UNIT QTY

UNIT PRICE

DOLLAR CENT

TOTAL

DOLLAR CENT

9094-0001 Geosynthetic Reinforced Soil

(GRS) Slope Fill -Slide S3

LS 1

1(1) Class 3 Excavation CY 130

2(1) Selected Borrow Excavation Coarse

Aggregate, No.57

CY 775

3(1) Secondary Geotextile, Class 4, Type A Reinforcement

SY 3280

4(1) Primary Geosynthetic Geogrid

Fabric Reinforcement

SY 1960

5(1) Corrosion Resistant Steel Wire

Forms

LB 1600

6(1) Turf Reinforcement Mat SY 185

7(1) Select Borrow Excavation, Structure Backfill

CY 395

8(1) Topsoil, Furnished and Placed CY 180

9(1)

Seeding And Soil Supplements, Native Steep Slope Mix with Grain

Rye Seed Formula, Including

Mulch

LB 4

(1)

Items in Geosynthetic Reinforced Soil (GRS) Slope Fill – Slide S3 Lump Sum Item 9094-0002

Given For Information Only.