Reese_St_Special_Provisions-R2023-10-02.pdf

Mt. Washington Landslide Mitigation – Reese Street Site Special Provision Table of Contents

Item No. Description Page No.

PREFACE TO CONTRACTOR SPECIAL PROVISIONS 2

NOTICE TO CONTRACTOR 3

4201-0001 CLEARING AND GRUBBING, INCLUDING BOUNDARY 4-5

STAKING AND PROTECTION

4802-0003 TOPSOIL FURNISHED AND PLACED, MODIFIED 6

4810-0052 SELECTIVE TREE REMOVAL, AS DIRECTED 7

5006-1010 42" DIAMETER DRILLED CAISSONS, SHAFT SECTION IN SOIL, 8-9

WITHOUT TIP AND CSL

5006-1055 42" DIAMETER DRILLED CAISSONS, SHAFT SECTION IN ROCK, 8-9

WITHOUT TIP AND CSL

8914-0001 DESIGN TRAFFIC CONTROL PLAN 10-11

8915-0001 CONSTRUCTION OF MAINTENANCE AND PROTECTION 12

OF TRAFFIC

9000-0001 GROUT STABILIZATION – SURVEY 13-21

9000-0002 GROUT STABILIZATION - INJECTION HOLES 13-21

9000-0003 GROUT STABILIZATION - GROUT INJECTION 13-21

9000-0004 GROUT STABILIZATION - GROUT VERIFICATION TEST BORINGS 13-21

9000-0005 GROUT STABILIZATION - VIDEO CAMERA 13-21

9000-0006 PLANTINGS, AS DIRECTED 22

9000-0007 TEMPORARY ACCESS 23

9000-0008 STEEP SLOPE NATIVE SEED MIX 24-25

9000-6171 TEMPORARY SHIELDING FOR ROCK SLOPE SCALING 26-27

9000-6172 ROCK SCALER 28-31

9000-6173 SCALED ROCK DISPOSAL 28-31

TEMPORARY EXCAVATION SUPPORT AND PROTECTION SYSTEM 32-36

R2023-09-28

PRE-CONSTRUCTION AND POST CONSTRUCTION INSPECTIONS 37-38

R2023-09-28

R2023-10-02

PREFACE TO CONTRACT SPECIAL PROVISIONS

Special Provisions for the Mt. Washington Landslide Mitigation – Reese Street Project reference the Pennsylvania Department of Transportation (PennDOT) Publication 408, 2020 through Change No. 6 as located online as follows:

https://www.dot.state.pa.us/public/PubsForms/Publications/Pub_408/408_2020/408_2020_6/408_2020_6 .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 a “4”, “5”, “8” or “9,” the work is governed by the special provision.

NOTICE TO CONTRACTOR

Suggested Field View During Bid Preparation The Contractor is required to field view the site to accurately identify site conditions and repair locations when preparing bids.

Access to City Owned Property The majority of the project lies within property owned by the City of Pittsburgh. In the areas where the project documents require the contractor to go beyond city-owned property, the Department of Mobility and Infrastructure (DOMI) has obtained Temporary Construction Easements (TCEs) from other landowners for the project. Under no circumstances is the contractor permitted to go beyond the Limits of Contractor Access, as outlined in the plans, without prior approval of DOMI. Any work outside of the Limit of Disturbance (L.O.D.), as shown in the E&S Plans, requires prior approval of DOMI including, but not limited to, required permit modifications (including E&S Plans) by the contractor, the extent of the increase in L.O.D. and the planned restoration of any additional areas not covered by the contract documents.

Within the L.O.D., the contractor must obtain approval from DOMI for the removal of any trees larger than 6” in diameter prior to the start of Clearing and Grubbing operations.

ITEM 4201-0001 – CLEARING AND GRUBBING – INCLUDING BOUNDARY STAKING AND

PROTECTION

DESCRIPTION – In accordance with PennDOT Publication 408 Section 201.1 and add the following:

- Tree removal and grubbing above the rock outcrop.

- Staking the boundary of the limits of contractor access.

- Protection of the existing fence between parcels 2 and 5 along the eastern edge of the alley/unnamed road.

- Protection of the existing walls and equipment along the eastern edge of the limits of contractor access at the end of the alley/unnamed road.

- Protection of the existing inlet, top unit, grate and pipe at the end of the alley/unnamed road.

- Protection of the existing asphalt pavement and asphalt wedge curb that comprise the alley/unnamed road.

MATERIAL – In accordance with PennDOT Publication 408 Section 201.2 and add the following:

- Wooden stakes/posts 5 feet in length. Designed to drive satisfactorily into the ground. The Field Representative may accept alternative stakes/posts.

- Chain link fence fabric and posts in accordance with PennDOT Publication 408 Section 624.2.

- Concrete inlet, concrete top unit, steel grate and concrete pipe in accordance with PennDOT Publication 408 Sections 601.2 and 605.2.

- Asphalt pavement and subbase in accordance with PennDOT Publication 408 Sections 313.2, 350.2, 413.2 and 460.2.

CONSTRUCTION – In accordance with PennDOT Publication 408 Section 201.3 and add the following:

- Prior to beginning construction activities, place wooden stakes/posts at maximum 100’ spacing around the boundary of the limits of contractor access as designated on the contract plans. Make the stakes/posts visible to alert contractor personnel of the site working limits. Remove the stakes/posts at the conclusion of construction.

- Contractor to protect the existing chain link fence along the eastern edge of the alley/unnamed road throughout construction. If fence needs to be removed, submit a plan for review and approval for the removal limits. Store and reset the fence at the conclusion of construction. If damaged, replace the fence and posts within the limits of removal at no additional cost to the City. Follow PennDOT Publication 72M for applicable construction standards.

- Contractor to protect the existing walls and equipment along the eastern side of the contractor access limits throughout construction. If damage to these features occurs due to the contractor’s activities, repair or replace the feature at no additional cost to the City.

- Contractor to protect the existing inlet, top unit, grate and pipe at the end of the alley/unnamed road throughout construction. If any of these features need to be removed during construction, submit a plan for review and approval for the removal limits. Store the feature(s) and reset the feature(s) at the conclusion of construction. If at any time during construction damage to these features occurs due to the contractor’s activities, repair or replace the feature at no additional cost to the City. Follow PennDOT Publication 72M for applicable construction standards.

- Contractor to protect the existing asphalt pavement and asphalt wedge curb at the end of the alley/unnamed road throughout construction. If any of the pavement or curb needs to be removed during construction, submit a plan for review and approval for the removal limits.

Reconstruct the affected pavement and curb at the conclusion of construction. If at any time during construction damage to these features occurs due to the contractor’s activities, repair or replace the feature at no additional cost to the City. Follow PennDOT Publication 72M for applicable construction standards. Submit a pavement design for review and approval that follows PennDOT Publication 242 flexible pavement design requirements and minimums for a local road.

MEASUREMENT AND PAYMENT – Lump Sum.

Includes all appurtenant work and materials required for the work specified. If no item of work is provided in the contract, this work is incidental to the other contract items.

ITEM 4802-0003 - TOPSOIL FURNISHED AND PLACED, MODIFIED

In accordance with PennDOT Publication 408, Section 802, except as follows:

MEASUREMENT AND PAYMENT – Square Yard.

END OF SPECIAL PROVISION

ITEM 4810-0052 – SELECTIVE TREE REMOVAL, AS DIRECTED

DESCRIPTION – In accordance with PennDOT Publication 408 Section 810.1 and add the following:

- Selective tree trimming, removal and grubbing below the rock outcrop as designated on the contract plans.

MATERIAL – In accordance with PennDOT Publication 408 Section 810.2

CONSTRUCTION – In accordance with PennDOT Publication 408 Section 810.3 and add the following:

- Prior to performing trimming/removal operations, submit a plan for review and approval for the tree trimming and removal required for construction activities.

MEASUREMENT AND PAYMENT – EACH.

Includes all appurtenant work and materials required for the work specified.

ITEM 5006-1010 42” DIAMETER DRILLED CAISSONS, SHAFT SECTION IN SOIL, WITHOUT

TIP AND CSL

ITEM 5006-1055 42” DIAMETER DRILLED CAISSONS, SHAFT SECTION IN ROCK,

WITHOUT TIP AND CSL

DESCRIPTION – In accordance with PennDOT Publication 408 Section 1006.1 and as follows:

- Section 1006.1(l). Thermal Image Profiling (TIP) is not required.

- Section 1006.1(m). Crosshole Sonic Logging (CSL) is not required.

- Section 1006.1(n). Submersible Inspection Device (SID) is not required.

- Test Holes. Not required by the contract plans and documents but may be performed per

Section 1006.3(c) at the Contractor’s discretion and expense.

- Probe Holes. Not required by the contract plans and documents but may be performed per

Section 1006.3(d) at the Contractor’s discretion and expense.

MATERIAL – In accordance with PennDOT Publication 408 Section 1006.2 and as follows:

- Section 1006.2(e) Class A SCC. Add: with Internally Colored Concrete Section 711.3 (h), Color: BROWN. Contact City of Pittsburgh Department of Mobility and Infrastructure for final approval of color prior to acquisition.

- Section 1006.2(g). TIP Materials are not required.

- Section 1006.2(h). CSL Materials are not required.

- Section 1006.2(i). Submersible Inspection Device (SID) is not required.

- Provide 36” Diameter Perforated Thermoplastic Pipe, Group VIP per Section 604 –

Combination Storm Sewer and Underdrain

- Provide No. 57 Coarse Aggregate per Section 703 – Aggregate

CONSTRUCTION – In accordance with PennDOT Publication 408 Section 1006.3 and as follows:

- Section 1006.3(a).1. Contractor Qualifications. Bullet 4 is not required.

- Section 1006.3(a).3. Independent Testing Agency is not required.

- Section 1006.3(a).4. Drilled Caisson Installation Plan. Revise bullet 7 to state:

Details, methods, equipment for bottom inspections using the downhole camera. Include downhole camera for sign structure, sound barrier, and highway lighting caisson foundations only when indicated.

- Section 1006.3(a).4. Drilled Caisson Installation Plan. Revise bullet 11 to state:

Sample of proposed drilled caisson report, including log of materials encountered and sample of proposed test boring log. Provide caisson integrity testing for sign structure, sound barrier, and highway lighting caisson foundations operated by qualified individuals only when indicated.

- Section 1006.3(a).5. QC Procedures. Revise bullet 3 to state:

Methods and procedures for downhole inspection, including the use of downhole inspection camera.

- Section 1006.3(e).1. Drilled Caisson Bottom Inspection. Revise to replace all mentions of “SID” with “Downhole Camera”.

- Section 1006.3(f). Reinforcement. Revise the first paragraph to state the following:

- Provide protective coating as indicated - Section 1019.2(b) Epoxy Resin with BROWN pigmentation.

Federal Color Standard 20129 or approved equivalent.

Provide a reinforcing cage that consists of longitudinal bars, spiral, hoop, or tie bars, cage stiffener bars, spacing devices, and any other appurtenances required to maintain alignment, shape, and clearances. Use concrete spacers or other approved non-corrosive spacing devices at sufficient intervals (within 5 feet of the top and bottom and at intervals not exceeding 10 feet along the length of the drilled caisson) to ensure concentric spacing for the entire cage length.

- Section 1006.3(f). Reinforcement. The fifth paragraph is not required.

- Section 1006.3(f). Reinforcement. Revise the eighth paragraph to state the following:

If the caisson has been excavated below the anticipated tip elevation, extend the reinforcing cage at the tip (low) end using splicing methods as indicated or approved.

- Section 1006.3(j) Caisson Integrity Testing is not required.

- Section 1006.3(k) Integrity Testing Results is not required.

- Section 1006.3(l) Evaluation of Integrity Testing Results is not required.

- Section 1006.3(m) Evaluation by Core Drilling. Revise the first paragraph to state the following:

If the Representative does not accept a drilled caisson based on non-destructive testing, verify the drilled caisson conditions using concrete coring.

- Section 1006.3(n).2. Concrete Placement Records. Bullet 3 is not required.

- Section 1006.3(n).3. Integrity Testing Reports and Evaluations. Bullets 1 and 2 are not required.

- Place 36” Diameter Perforated Thermoplastic Pipe, Group VIP in as indicated on the contract plan sheets to achieve uniform contact with the drilled caissons and backfill the interior of the pipe with No. 57 Coarse Aggregate from the bottom elevation of the pipe to be flush with the top elevation of the pipe.

MEASUREMENT AND PAYMENT – In accordance with PennDOT Publication 408 Section

1006.4 and as follows:

- Section 1006.4(a).1. Add the following:

36” Diameter Perforated Thermoplastic Pipe, Group VIP and No. 57 Coarse Aggregate are incidental to this quantity per the limits outlined on the contract plan sheets.

- Section 1006.4(d). Permanent Casing for Drilled Caissons. Revise to state the following:

Use of casing is at the option and expense of the contractor. Any elected use of casing must meet the requirements of this specification and any casing left in place will not be paid for by the Department.

- Section 1006.4(e) Test Holes is not required.

- Section 1006.4(f) Probe Holes is not required.

- Section 1006.4(g) Obstructions is not required.

- Section 1006.4(h) TIP is not required.

- Apply pigmented protective coatings to all finished caisson surfaces in accordance with Section 1019.

Extend protective coating a minimum of 2 feet below the finished grades.

- Protective Coating. Section 1019.4

R2023-09-28

Incidental to ITEM 5006-1010 42” DIAMETER DRILLED

CAISSONS, SHAFT SECTION IN SOIL, WITHOUT TIP AND CSL

ITEM 8914-0001 – DESIGN TRAFFIC CONTROL PLAN

DESCRIPTION – This work is the design and plan preparation for required maintenance and protection of traffic during construction.

A. General Designs that take advantage of any errors and/or omissions in the following requirements will not be accepted. In the event any such error, omission, or discrepancy is discovered, immediately notify the City of Pittsburgh (City) Field Representative. Failure to notify the City Field Representative will constitute a waiver of all claims for misunderstanding, ambiguities, or other situations resulting from the error, omission, or discrepancy.

Experimental or demonstration-type design concepts, products, structures, or elements not pre-approved by the City Field Representative for general usage at the time of bid, will not be allowed.

B. Design Requirements and Specifications Develop a Traffic Control Plan (TCP) for submission, review, and approval by the Municipal Traffic Engineer prior to starting construction activities in accordance with the City of Pittsburgh, Department of Mobility and Infrastructure (DOMI), Right-of-Way Procedures Manual dated May 1, 2022, Chapter 3.

Obtain approval from DOMI to close the unnamed city street east of Reese Street for site access and staging, if necessary under Design Traffic Control Plan.

The Emerald View Trail is below the construction site and a portion will need to be closed during construction. Post signs on the trail notifying users where the trail is closed. Temporary signs are to be in accordance with PennDOT Publication 236M and sized for a Conventional Road. Modify the standard W20-3 “ROAD CLOSED” sign to read “TRAIL CLOSED” and include the trail closure signage in the Traffic Control Plan.

Contact Kara Smith ten (10) calendar days before construction begins to verify the start date for construction.

Kara Smith Principal Environmental Planner kara.smith@pittsburghpa.gov Phone: 412-255-2676

Post trail closure signs seven (7) days before the start of construction at the following locations:

Emerald View Trail access at Grandview Avenue Trailhead o 1435 Grandview Ave, Pittsburgh, PA 15211

Emerald View Trail access at Greenleaf Street Trailhead o 1870 Greenleaf St, Pittsburgh, PA 15211

Emerald View Trail for Eastbound access at the intersection with the Expedition Trail Expedition Trail access at the end of Lizardi Way

See Pittsburgh Trails Map for locations of these features: https://gis.pittsburghpa.gov/pghtrails/

Post TRAIL CLOSED signs with a physical barricade the full width the trail 200’ feet in advance of the work area.

Contact Shawn Wigle at the City of Pittsburgh Office of Environmental Services to coordinate garbage pick-up for the Vertical Bridge property during the alley closure.

Shawn Wigle Superintendent

City of Pittsburgh Office of Environmental Services shawn.wigle@pittsburghpa.gov Phone: 412-255-8636 When construction is completed, safely remove all signs and physical barricades. Contact Kara Smith to arrange delivery of the signs and barricades for future use.

During construction, always maintain full access from Reese Street to the Vertical Bridge building and tower.

Notify the following emergency responder contact five (5) calendar days before construction begins.

Contact: Alan W. Hausman City of Pittsburgh Department of Public Safety Emergency Management/Homeland Security 2945 Railroad St.

Pittsburgh, PA 15206 Phone: 412-255-2633 Fax: 412-255-8662

MEASUREMENT AND PAYMENT – Lump Sum

Includes all appurtenant design activities required for the work specified.

ITEM 8915-0001 – CONSTRUCTION OF MAINTENANCE AND PROTECTION OF TRAFFIC

DESCRIPTION – This work is the construction of the maintenance and protection of traffic according to the approved Traffic Control Plan developed as part of the ITEM 8914-0001 - Design Traffic Control Plan.

MATERIAL – As indicated and as specified in the Traffic Control Plan.

CONSTRUCTION – In accordance with PennDOT Publication 408; the Special Provisions of the contract;

and any additional requirements specified herein.

Do not start construction until the Traffic Control Plans stamped “Released for Construction” are transmitted by a letter indicating which work can proceed. Construction may start on stages or phases of the Traffic Control Plans provided that partial plans stamped “Released for Construction” are transmitted by a letter indicating which work can proceed.

The City of Pittsburgh 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 is incidental to this item, without exception.

ITEM 9000-0001 TO ITEM 9000-00005 - GROUT STABILIZATION OF ABANDONED

UNDERGROUND MINE

Items Included:

9000-0001 GROUT STABILIZATION -SURVEY

9000-0002 GROUT STABILIZATION - INJECTION HOLES

9000-0003 GROUT STABILIZATION - GROUT INJECTION

9000-0004 GROUT STABILIZATION -GROUT VERIFICATION TEST BORINGS

9000-0005 GROUT STABILIZATION - VIDEO CAMERA

DESCRIPTION - This work is stabilizing abandoned underground coal mine workings by locating and grouting as shown on the drawings or as directed. Upon completion of stabilization, drill NX or NQ grout verification test borings to determine the effectiveness of the grouting operations using video camera, as directed by the Engineer.

MATERIAL-

(a) Grout Injection Borehole Casing. Nominal 6" I.D. Grade A36 steel. Alternative types and sizes may be used if approved by the Representative as part of the Work Plan.

(b) Cement. ASTM C150 Type II Portland Cement.

(c) Fly Ash. AASHTO-M295 Class F. Uniformity requirements are waived.

(d) Fine Aggregate. Section 703.1 Mortar Sand Type C.

(e) Coarse Aggregate. Section 703.2 AASHTO Number 8.

(f) Water. Section 720.1.

(g) Bentonite. High swelling bentonite such as CETCO Volclay or equivalent approved by the Representative.

(h) Production Grout Mix. Provide a pumpable mix consisting of cement, fly ash, fine aggregate, coarse aggregate, bentonite, and water.

SUBMITTALS

(a) Qualifications. Submit Company and project Superintendent's qualifications which exhibit a minimum of five years of responsible experience in grouting operations applied to abandoned underground mines.

(b) Equipment. Submit documentation to the Representative that documents the equipment to be provided and that they meet or exceed the requirements of these Specifications.

(c) Work Plan. Submit a written work plan for approval within 5 days of notice to proceed. At a minimum include example drilling records or forms; grout injection record forms; relationship of work to utilities; list of equipment to be used; proposed grout mix designs (including strength, slump, and gel time test results); traffic control measures; Erosion and Sedimentation control measures; air pollution control measures; personnel qualifications; quality control; etc. Write Work Plan to maintain traffic in accordance with the accepted MPT Plan at all times during drilling and grouting operations. Include angled borehole surface location coordinates, elevations and inclinations from vertical to reach the depth of the mine at the borehole locations shown on the drawings. Provide calculations to demonstrate that the proposed angled borehole locations will enter the mine roof at the planned locations. Provide method for determining angle hole position and verticality, as well as method for monitoring and procedures for correction during advancement. All boreholes, vertical and angled, must be positioned to avoid existing utilities.

Provide all borehole locations to the Engineer as part of the Work Plan. for written approval prior to drilling Meet with the Representative to discuss and review the Work Plan.

(d) Construction Records. Keep accurate drilling records regarding date, driller, depth of borehole, station and offset, top of borehole elevation, orientation (direction and inclination from vertical if not drilling vertically), type of strata encountered, static water level, depth to mine bottom, height of mine, height of the voids when encountered, thickness of coal, loss of air or water pressure with its associated depth, length and size of casing and depth to bottom of casing. Submit each drilling record within 24 hours of completion of drilling each grout injection borehole. Maintain records of the grouting and concrete injection operations. Keep records for each grout injection borehole documenting the dates and times of injection, mixes used, quantities injected, depths of tremie pipe, and any special circumstances encountered during the injection procedures. The fact that an inspector will be present and keeping an independent record of the drilling will not relieve the contractor from the requirement for keeping accurate records as described. Submit copies of the records to the Representative daily at the completion of each work shift.

CONSTRUCTION -

(a) General

Area of stabilization will include mine voids, mine gob and coal pillars. Provide stabilization by injecting low strength mixtures of cement, fly ash, coarse and fine aggregate, water, and bentonite through grout injection boreholes from the surface.

The contractor is responsible for determining the proper angle and azimuth required to intercept the mine at the locations shown on the drawings.

Verify the completeness of the stabilization using verification test borings and borehole television camera as required. Provide video logging of boreholes or verification test borings as directed by the Representative. Modify procedures when directed by the Representative to suit conditions encountered at the site. Modifications may include the following:

1. Increasing or decreasing slump of grout or concrete.

2. Increasing the number of stages utilized to form concrete columns.

3. Grouting of mine gob.

The Representative will determine the type(s) of treatment required in each borehole at completion of grout injection borehole drilling. Representative may direct combining treatment types in the same borehole depending upon condition of the coal seam in the borehole.

Clean up and remove all waste immediately upon completion of drilling and upon completion of grout injection operations.

(b) Equipment

1. Methane Monitor(s). Provide a methane and oxygen monitor capable of continuously monitoring for the two gases with a precision of 0.1%. Submit specifications or data sheets for the monitors to the Representative for review and acceptance prior to beginning any drilling activity.

Operate the monitor at each boring location. Maintain monitors in good operating condition, including calibration, for the life of the project. Make the monitor available to the Representative for inspection of the boreholes and any previously drilled boreholes on the project. Repair and replace monitors within 24 hours of notice from the Representative. Drilling boreholes in deep mined areas is not permitted if the monitor is not present and operating as specified.

2. Injection Hole Drills. Furnish an adequate number of fully-equipped drill rigs of sufficient size and capacity to drill grout injection boreholes in an efficient manner, using destructive methods.

Provide only rotary-type equipment capable of removing cuttings by air or by use of augers. Use of water or other fluids is not permitted. Furnish a minimum of one drill rig capable of drilling angled holes with a maximum inclination from vertical of 30° in rock to depths of at least 100 feet.

Equip all drill rigs with functioning pressure gauges for monitoring changes in drilling air pressure and down pressure.

3. Air Pollution Control Equipment. Equip the drills with a complete dust control system or mechanism to collect all dust produced in the process of drilling and prevent the discharge of dust produced in the process of drilling into the atmosphere. Provide an automatically operated dust control system of ample capacity to serve under all conditions.

4. Grout Pump. Provide a mobile concrete grout pump capable of pumping a minimum of20 cubic yards per hour through a 4" diameter tremie pipe.

5. Measuring Equipment. Provide meters or other equipment approved by the Representative for accurately measuring the volume of pumped grout.

6. Piping System. Furnish and install a system of pipes, including valves, gauges and other control devices to perform the work as specified.

7. Mixing Plants. Section 704.1(a).1 for batch mixing or Section 704.3 for volumetric mixing.

8. Other Items. Provide all valves, packers, pressure hose, pipe, fittings, and tools as may be necessary to provide a continuous supply of concrete or flyash-cement grout to the mine void.

9. Video Camera. Provide a borehole video camera system for video inspection of the overburden rock and mine voids with the following features:

• Accessibility through a 6" diameter borehole to a depth of 100'.

• Provide color video with high resolution and sharpness on DVD format.

• Remotely controlled focus and internal variable light source.

• Reel mounted cable with depth increments.

• Audio indicator of depth.

• Portable color video monitor for field viewing. 14" Diagonal Screen Minimum

• Audio input capability.

• Recordable to electronic media via DVD and flashdrive for submission and review by the

Representative.

• Lens and light source suitable for inspecting the walls of the borehole in the overburden rock.

• Right angle lens and light source suitable for inspecting mine voids to a minimum distance of 30' from the borehole.

• Compass bearing direction that the lens is facing through audio tract during video recording process.

• Waterproof light source capable of being lowered through a 6" borehole to a depth of

110', in addition to the camera's light source.

10. Grout Verification Test Boring Drills. Drill all grout verification test borings using standard rotary type drilling equipment. Supply equipment capable of drilling an NX or NQ diamond drill hole in rock to depths of at least 100 feet. Maintain all drilling equipment in optimum operating condition. Furnish an adequate number of fully-equipped drill rigs of sufficient size and capacity to drill grout verification test borings an efficient manner.

(c) Grout Mixes

1. General. Grout may be ready-mixed and transported to the site or batch mixed on site by a pre-approved batch plant. Provide 7- and 28-day compressive strength test results, mix proportions, and slumps for all test mixes.

2. Mix No. 1. Provide mix consisting of water, Type II Portland Cement, sand, flyash, and coarse aggregate. Sand may be eliminated from the mix only upon approval. Proportion grout mixes to produce a pumpable mix at 2" to 4" slumps and a 7-day compressive strength of 200 psi and 28- day compressive strength of 700 psi.

3. Mix No. 2. Provide mix consisting of water, Type II Portland Cement, sand, flyash, and bentonite.

Sand may be eliminated from the mix when directed by the Representative. Proportion grout mixes to produce a pumpable mix at 4" to 8" slumps and a 7-day compressive strength of 200 psi and 28-day compressive strength of 700 psi.

4. Mix No. 3. Provide mix consisting of water, Type II Portland Cement, flyash and bentonite.

Proportion grout mixes to produce a mix at 8" to 10" slump and a 7-day compressive strength of 200 psi and a 28-day compressive strength of 700 psi.

5. Additives. Additives incorporated in grout mix designs to increase flowability or accelerate strength gain may only be used by prior approval. There will be no extra payment for additives used by the contractor for his own convenience or to provide the minimum compressive strength and maximum gel time specified. Additives requested by the Representative will be paid as extra work.

All grout mix designs to be used will be subject to review and approval of the Representative. Submit proposed designs with Work Plan, with sufficient test data to verify strength, within 5 days of notice to proceed. If testing during the injection operations indicates that expected slumps, strengths are not being achieved due to mixing proportions, modify the mixing proportions to achieve satisfactory strengths.

Provide clean water, used in the grout, free from injurious amounts of sewage, oil, acid, alkali, salts, organic matter and other foreign solids. Whenever the outside air temperature is below 20 degrees F, heat the water to be used in the grout mixes to a temperature of 70 degrees F to avoid freezing in the lines. Follow the same procedure in cleaning or flushing the lines.

Furnish and store cement so that it will not deteriorate from moisture, weather or other causes.

Storage provisions will be subject to the approval of the Representative. Do not use cement in storage more than two months for grout. The use of bulk cement will be permitted provided methods of handling, transporting, storage and measuring are submitted to the Representative for approval.

Otherwise, only cement furnished in cloth or paper bags will be accepted for use in the work. Supply the Representative with a list of equipment to be used for storing and handling cement. The storage facilities will be inspected by the Representative and must be approved prior to delivery of any cement. Use sacked cement in the chronological order in which it is delivered on the job to prevent undue aging of sack cement after delivery.

Store each shipment of cement so that is may readily be distinguished from other shipments. Use cement free from lumps due to warehouse set. In the event the cement is found to contain lumps or foreign matter of any amount which the Representative considers deleterious to the grouting operations, screening through a U.S. Standard 100-mesh screen will be required. No additional payment will be made for such screening or for old cement which must be wasted. Store a sufficient quantity of cement at or near the site of the work to ensure that grouting operations are not delayed by shortage of cement.

(d) Survey

Choose a registered surveyor who is experienced in surveying techniques subject to approval by the Representative. All the contractor's survey procedures will be subject to review and approval by the Representative.

Determine the elevation of all injection boreholes with reference to a benchmark. Mark each injection borehole with a 2-inch by 2-inch oak hub driven flush with the ground surface Place a witness stake bearing the borehole number and ground surface elevation at each borehole location.

Install survey nails and paint identification information at each borehole location in paved areas.

Record elevations. Clearly mark the required angle and azimuth for all angled boreholes required to intercept the mine the specified location for inaccessible areas. Replace any stakes destroyed prior to the completion of injection operations.

(e) Drilling Operations

Due to the presence of a coal mine at the site, grout injection boreholes may encounter methane gas. Conduct continuous air monitoring for methane during all drilling and grouting operations.

Monitor methane levels in the immediate work area continuously from the start of drilling for each grout injection borehole. If methane above one (1) percent is detected, install suitable standpipes, flame arrestors, and all other required accessories per Representative's approval. If methane above 5% is detected, stop all work until the level decreases to below 5%.

Protect all utilities. All borings, vertical and angled, must be laid out to avoid existing utilities.

Coordinate with the facility owners for required clearances. Mark on the ground surface, the location of underground utilities or structures with potential for interference with these operations.

Maintain the markings for the duration of the project. Should the location of any marked underground utility or structure prohibit the drilling of any borehole, advise the Representative for possible relocation of said borehole and receive written approval prior to drilling.

Stake locations of primary grout injection boreholes to reach the depth of mine at the locations shown on the Mine Grouting Plan. Set up drill rigs within 4" of the staked locations of the boreholes. Increase or decrease the number and depth of boreholes, if directed. Grout Injection Boreholes may be angled up to 30° from vertical to access the depth of the mine at the locations shown on the Mine Grouting Plan. Secondary boreholes may be added as directed by the Representative based on the success of treatment.

Drill all angled grout injection boreholes at the angle and azimuth outlined in the Work Plan to intercept the mine at the location shown on the Mine Grouting Plan. Adhere to all other provisions for injection borehole drilling. Angled drill holes will be paid by the linear VERTICAL foot below the ground surface as measured vertically above the mine interval at the mine intercept locations shown on the Mine Grouting Plan, rather than the linear ANGLED foot. All boreholes must enter the top of mined coal seam within 1 foot horizontally of the planned location to be considered acceptable for payment. Determine angle hole pos1t10n and verticality, as well as perform monitoring and correction during advancement as indicated in the Work Plan.

Restore to original grade any areas disturbed as a result of borehole drilling operations.

Advance 8" grout injection borehole through soil overburden to top of rock. Install 6" borehole casing and firmly seat in rock. The depth of the 8” grout injection borehole and the corresponding length of the 6" casing must be approved by the Representative prior to installation of the casing. Continue drilling with 6" hole through rock to the mine horizon.

Install all casings to project a minimum of three inches and a maximum of six inches above existing ground surface. At the completion of drilling each borehole, close the borehole in a manner to prevent any oxygen or surface water entering into the mine voids and to prevent blocking of the borehole until the time of grout injection. This includes the casing and the annular space between the casing and the borehole.

Replace any boreholes that are lost or become unusable at no additional cost to the City. Provide all borehole records to the Representative for review and acceptance prior to performing any borehole video camera viewing. Allow 72 hours for review and acceptance after all acceptable borehole records are received.

When and where directed, lower a borehole television camera into the borehole to view the condition of overburden rock and mine void/coal seam. Where voids are encountered, view horizontally through the voided interval while placing an independent light source at the same depth interval in all adjacent boreholes. Perform video inspection in the presence of the Representive and record on electronic media. Provide recordings to the City on DVD and flashdrives.

Note the conditions observed in the video on the borehole record at appropriate depths. Include audio narrative of position and compass direction of any observed void spaces or other anomalies.

Video recordings become property of the Representative upon completion.

Develop a proposed grouting sequence and grout mix type proposed at each borehole based upon the Grout Mix criteria and dip direction of the mine. Open voids located in the down dip direction should be treated first to form a cut-off unless otherwise directed. Submit the proposed grouting sequence along with final drilling records and video camera records to the Representative for acceptance. Allow 72 hours for review and acceptance after all acceptable records and sequences are received.

(f) Mine Grouting

The mix type, depths, and grout injection sequence may be modified by the Representative upon completion of the grout injection borehole drilling. In order to effectively treat the mine, it may be necessary to place grout in multiple stages using different mixes. Accordingly, the Contractor will be required to monitor grout movement in adjacent boreholes, and may be required to remove the tremie pipe during injection to monitor the level of material in the grout injection borehole.

1. Mine Void Grouting. If a mine void is encountered and the area near the injection point is clear of deleterious amounts of mine gob, the borehole will be designated for grout column grouting (Grout Mix 1). A mine void is considered to be a minimum 3-foot-deep completely open section of the mine interval through which no mine gob or collapsed roof material is encountered during grout injection borehole drilling. Using a minimum 4" diameter tremie pipe, inject Grout Mix 1 beginning at the level of the mine floor. Raise the tremie pipe in 1' increments until the bottom of the tremie pipe is withdrawn 2' into the mine roof rock. Inject the Grout Mix 1 at a constant rate, in a single stage, and at pressure no greater than required to move grout through the piping system.

Concrete columns will be considered complete when the column is in acceptable contact with the mine roofrock and when the concrete extends 2' into the roof rock. Once the grout extends 2' into the roof rock, allow it to harden for 8 hours before proceeding with the rock overburden grouting.

Use a concrete pump for this stage of treatment. If an excessive volume of concrete has been injected, 16 cubic yards, thicken the mix.

2. Mine Gob Grouting. If a significant amount of gob or a totally collapsed condition exists at the point of injection, the borehole will be designated for pressure mine gob grouting (Grout Mix 2).

Extend a grout supply pipe with grout injection tube and closed end discharge tip to the mine floor.

Inject grout at a maximum pressure of 50 psi measured at the point of injection. Withdraw the injection tube in 1' increments when the flow of grout stops under maximum pressure at each increment. If the grout flows freely and the hole takes 8 cubic yards of grout without the grout rising in the grout hole, thicken the mix as directed by the Representative. Fill the hole with grout to 2' into the roofrock, and allow grout to harden for 8 hours before proceeding with rock overburden grouting.

3. Coal Pillar Grouting. If it has been determined by the Representative that a coal pillar has been encountered, the borehole will be designated for coal pillar grouting (Grout Mix 2). Using a tremie pipe, inject grout beginning at the bottom of the borehole. Raise the tremie pipe in l' increments up the borehole. Place grout to 2' into the roof rock and allow grout to harden for 8 hours before proceeding with rock overburden grouting.

4. Rock Overburden Grouting. Extend a grout supply pipe with grout injection tube to the top of the previously injected mine grout. Set a packer in competent rock immediately below the casing and force the grout into the fractures at a maximum pressure equal to 1 psi per foot of depth to injection point using Grout Mix 3. If large takes are encountered greater than 15 cubic feet, thicken the mix and, if the take persists, add sand or aggregate as directed by the Representative.

5. Soil Overburden Grouting. Fill the remainder of the grout injection borehole from the last stage of the rock overburden grouting in the soil overburden by tremie grouting with Grout Mix 2. Place grout to the ground surface. Withdraw the 6" borehole casing concurrent with tremie grouting.

Abandonment of the borehole casing within the ground is not permitted.

(g) Grout Verification. Perform drilling at directed locations to verify post-grouting conditions and retrieve samples for visual inspection.

1. Drill all NX or NQ performance test borings using a drilling contractor on the PennDOT's current "Approved Test Boring Contractors List." All the drilling contractor's personnel, equipment, and procedures will be subject to review and approval by the Representative.

2. Mobilize a driller who is currently entered on ECMS as prequalified for Work Class Code C6 to complete core borings, auger borings, obtain rock core samples, and backfilling/plugging borings with cement grout, as directed by the Representative.

3. Drill borings at the location and depth or elevation indicated or as directed by the Representative. Complete all work in accordance with PennDOT's Standard Specifications for Subsurface Drilling, Sampling, and Testing, Publication 222. Comply with the following additional supplement provisions:

4. Provide methane monitoring during the drilling of all boreholes.

5. Perform unsampled auger boreholes to the top of rock.

6. Use split inner barrels for all rock coring.

7. Core a minimum of 10 feet of bedrock immediately above the mine interval. Core additional depths as required by the Representative.

8. Only use hollow stem augers or flush joint casing to advance boreholes in conjunction with unsampled augering through soil. Record observations of grout take, tool drop, low recovery and/or voids within the borehole. Record specific depth/intervals of each observed condition to the nearest 0.1 foot. if encountered above the top of mine. Alternate methods for advancement of test borings may be used to determine effectiveness of the mine treatment encountered in overburden soil subject to approval by the Representative. Terminate verification test borings 2 feet below the base of the mine interval.

9. Provide a PennDOT certified drilling inspector to log all grout verification test borings. Perform exploratory drilling and prepare drilling logs only in the presence of the Test Boring Inspector.

10. Backfill to the ground surface in unpaved areas with Grout Mix 2. In paved areas, backfill to the subbase with Grout Mix 2 and provide appropriate bituminous pavement patch to match the existing pavement.

(h) Secondary Grouting. Based on the results of the Grout Verification test borings, the Representative will determine if additional grouting is required. Addition of secondary boreholes will be as directed by the Representative.

(i) Site-Specific Requirements. Drill, video and grout the boreholes in accordance with the approved work plan at the locations shown on the drawings. All boreholes shown on the drawings are primary grout injection boreholes shown at the depth of the mine. Offset and angle as required to avoid utilities or as directed by the Representative.

After completion of grouting, perform Grout Verification test borings as directed.

MEASUREMENT AND PAYMENT -

(a) 9000-0001 GROUT STABILIZATION - SURVEY - Lump Sum

(b) 9000-0002 GROUT STABILIZATION - INJECTION HOLES - Linear Foot. All injection boreholes, vertical and angled, will be paid based on the vertical depth of the hole. Footage for angled boreholes will be paid based on the vertical distance from the ground surface to the bottom of the borehole at the location that the borehole penetrates into the mined interval, not the angled linear footage.

(c) 9000-0003 GROUT STABILIZATION -GROUT INJECTION -Cubic Yard

Grout will be paid based on the actual quantity provided. Any adjustments to the mix causing a reduction in yield will be at the expense of the contractor.

(d) 9000-0004 GROUT STABILIZATION – G R O U T VERIFICATION TEST BORINGS - Linear Foot

(e) 9000-0005 GROUT STABILIZATION - VIDEO CAMERA-Day

Payment for items (a) through (e) constitutes full compensation for all work to be performed for completing work as specified herein, including, but not limited to, furnishing all plant, material, equipment and labor for: preparation of all submittals; surveying grout holes; preparing grout mixes; drilling; mixing and injecting grout; water; testing; supplemental traffic control; complying with all ancillary and environmental requirements; and documentation.

Any borehole which becomes blocked, collapses due to mechanical failure of equipment, inadequacy of grout or concrete supply, or operator error, and cannot be grouted for its full length, will be re-drilled and re-grouted at no additional cost to the City.

Restore all areas disturbed by the drilling and grouting operations to original conditions.

Restoration is incidental to the Items provided above and no additional payment will be made.

All temporary casing is to be removed. Any casing left in place or otherwise abandoned will not be paid for.

ITEM 9000-0006 – PLANTINGS, AS DIRECTED

DESCRIPTION – This work is the installation of plantings as directed by the City Forester and Representative at or within the Project Limit of Disturbance. Also included with this work is the protection, or removal and replacement of the existing shrubs/trees adjacent to the chain link fence along the eastern edge of the alley/unnamed city street as necessary for Contractor’s access or damaged from Contractor’s Work.

MATERIAL – In accordance with the City of Pittsburgh Natural and Wooded Area Restoration Standards and PennDOT Publication 408 Section 808.2

CONSTRUCTION – In accordance with the City of Pittsburgh Natural and Wooded Area Restoration Standards and PennDOT Publication 408 Section 808.3 and add the following:

- Contractor to coordinate the planting activities with the City Forester and the City Field Representative prior to removal of any existing plantings.

- If existing trees/shrubs are damaged due to the contractor’s activities without prior coordination with the City Forester and City Field Representative, the contractor will replace the affected trees/shrubs at no additional cost to the City.

MEASUREMENT AND PAYMENT – PDA.

Measurement and payment for this work will be coordinated with the City Forester and the Representative and based on a predetermined amount.

ITEM 9000-0007 – TEMPORARY ACCESS

DESCRIPTION – This work is the temporary measures related to the Contractor’s means and methods of construction which are required for the Contractor to access the construction site. This includes any temporary earthwork and support of excavation required to construct the project and restoration of the site to existing conditions. Refer to the special provision titled “Temporary Excavation Support and Protection System” for additional project specific information related to excavation limitations.

CONSTRUCTION – In accordance with OSHA standards and PennDOT Publication 408 Sections 201 and 206.

- Submit a plan to the City for review and approval for temporary measures for site access including any related calculations.

Includes all appurtenant design activities required for the work specified.

ITEM 9000-0008 – STEEP SLOPE NATIVE SEED MIX

In accordance with PennDOT Publication 408, Section 804, except as follows:

DESCRIPTION – In accordance with PennDOT Publication 408, Section 804.1, except revise to read as follows:

This work is the furnishing and placing of seed and soil supplements and mulch of the type indicated.

MATERIAL – In accordance with PennDOT Publication 408, Section 804.2, except revise to read as follows:

PennDOT Publication 408, Section 804.2(c)2. Add the following:

Formula and Species % By Mass

Min. % Purity

Min. % Germination

Max. % Weed Seed

Seeding Rate LBS per 1000 SY

STEEP SLOPE NATIVE SEED MIX 13.5

Indiangrass, NY4 Ecotype 31.1 95.50 90 0.15 4.20 Annual Ryegrass 20 95.50 90 0.15 2.70 Big Bluestem, 'Southlow'-MI Ecotype

14 95.50 90 0.15 1.89

Canada Wildrye 10 95.50 90 0.15 1.35 Virginia Wildrye, Madison-NY Ecotype

7 95.50 90 0.15 0.95

Autumn Bentgrass, Albany Pine Bush-NY Ecotype

4 95.50 90 0.15 0.54

Switchgrass, 'Shawnee' 4 95.50 90 0.15 0.54 Deertongue, Tioga 3 95.50 90 0.15 0.41 Purple Coneflower 1.5 95.50 90 0.15 0.20 Partridge Pea, PA Ecotype 1.3 95.50 90 0.15 0.18 Oxeye Sunflower, PA Ecotype 1.2 95.50 90 0.15 0.16 Lanceleaf Coreopsis 1 95.50 90 0.15 0.14 Blackeyed Susan 1 95.50 90 0.15 0.14 Wild Bergamot, Fort Indiantown Gap-PA Ecotype

0.3 95.50 90 0.15 0.04

Common Milkweed 0.2 95.50 90 0.15 0.03 Wrinkleleaf Goldenrod, PA Ecotype

0.2 95.50 90 0.15 0.03

New England Aster, PA Ecotype

0.1 95.50 90 0.15 0.01

Heath Aster, PA Ecotype 0.1 95.50 90 0.15 0.01

CONSTRUCTION – In accordance with PennDOT Publication 408, Section 804.3, except revise to read as follows:

PennDOT Publication…