Presentation_Slides.pdf

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“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Basic Ground Rules & Questions

2GROUND RULES

• Please sign the Attendance Sheet

• The Pre-Bid meeting is being recorded so we can ensure we capture the questions correctly.

• Contractors, please state name and company clearly before asking questions.

• Government personnel, please state name clearly before answering questions.

• Additional questions after this pre-bid meeting are to be submitted in writing via e-mail to

Leah.S.Morgan@usace.army.mil by 5:30 PM Eastern Time on October 11, 2019.

3GROUND RULES CONT.

• All questions and answers will be made available on the FBO.gov announcement for this solicitation mid to late October 2019. If the plans and specifications change as a result of questions today, an amendment to the solicitation will be issued.

• The written amendment will govern over any verbal answers provided during the pre-bid meeting.

• No Auto-CAD or CADD files will be provided during the pre-award phase.

• Photography inside the dam is prohibited.

• Copies of today’s slide presentations will not be provided.

• Participants who wish to tour the project today, other than the top of the dam, will be required to wear steel toed boots, safety vest, and a hard hat.

BID OPENING

• All bidders must return the following in a SEALED envelope marked with your company name, address, date and time offers are due, and the Invitation for BID number (W9123719B0001).

• Original and 1 Copy

• Standard Form 1442 (signed)

• Bidders MUST acknowledge (sign) all amendments.

• Section 00 10 00 (Bid Schedule)

• Section 00 45 00 (Representation and Certifications, in its entirety) to include completing requirements for FAR Clause 52.204-8

• Bid Guarantee (20% or $3 Million, whichever is less – See FAR Clause 52.228-1)

• Bidders must comply with requirements of 52.204-7, 52.204-8, 52.232-33, and any other SAM requirements, to include completing requirements in this solicitation through SAM.

• The Government will be extending the bid opening to mid-November.

• All bidders are encouraged to have an active registration at www.SAM.gov.

APPARENT LOW BIDDER

• Section 00 21 00 (Determination of Responsibility Requirements) and Definitive

Responsibility Criteria.

• Definitive Responsibility Criteria will be revised:

Old Language (a)

• Four (4) projects showing experience with placing over 75,000 cubic yards of mass concrete with 1.5 inch (or greater) aggregate.

New Language (a)

• At least four (4) projects, but no more than a total of eight (8) projects, showing experience with placing at least a cumulative total of 75,000 cubic yards of mass concrete with 1.5 inch (or greater) aggregate. Note that the quantity of concrete is the cumulative total of all submitted projects.

APPARENT LOW BIDDER CONT.

Old Language (b)

• Four (4) projects showing experience drilling through concrete and rock to install post tension high capacity (30 strand or more) anchors with tolerance of 1:150.

New Language (b)

• Two (2) projects showing experience directionally drilling through concrete and rock on a 1:150 tolerance as measured against a specified center line with real time survey and directional correction capabilities.

.59

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

WHAT IS BLUESTONE DAM?WHAT IS BLUESTONE DAM? 2

Federal Project:

• 1936: Flood risk management =

HELP REDUCE FLOOD RISKS

• 1938: Hydro-electric Power development =

NOT YET INSTALLED

• 1944: Recreation =

FISHING, BOATING, CAMPING

• 1958: Fish & wildlife enhancement added =

GAME MANAGEMENT

• 1988: Enhanced recreation =

WHITE WATER RAFTING

• 1996: Drift and debris removal =

PASS FLOOD DEBRIS

4,600 sq. mi.

WHERE IS BLUESTONE DAM LOCATED?WHERE IS BLUESTONE DAM LOCATED? 3

Bluestone Dam

• Bluestone Dam is on the New River, just upstream of the Greenbrier River.

• Bluestone Dam controls a watershed nearly the size of Connecticut.

• The New River is renamed the Kanawha River at Gauley Bridge, WV.

• Bluestone works with Summersville & Sutton Dams to reduce flood risk along the New & Kanawha River valleys all the way to Point Pleasant and down the Ohio River.

• ½ the water that passes Charleston, WV comes through Bluestone Dam.

BLUESTONE DAM’S COMPONENTS?BLUESTONE DAM’S COMPONENTS? 4

• Bluestone Dam is a Straight Concrete Gravity Dam

• Bluestone Dam is approximately 165 feet high

• Bluestone Dam is nearly ½ mile long

• Bluestone Dam impounds an 11 mile long lake on the New River

WHERE DOES BLUESTONE DAM REDUCE FLOOD RISK? WHERE DOES BLUESTONE DAM REDUCE FLOOD RISK? 5

$5.9B Cumulative Damages Prevented Though-out the New & Kanawha River Valleys

Hinton Montgomery Belle

Charleston John Amos Pt. Pleasant

And beyond on the Ohio

River..

to to to to

8 ft

12 ft

16 ft

20 ft

10.7 ft Impact Stage

How is the Dam operated to reduce downstream flooding?

Gage River Stage Hinton 10 ft Kanawha Falls 22 ft Charleston 36 ft Point Pleasant 45 ft

EXTREME EVENTS: FLOOD RISKS ARE NOT ELIMINATED BY DAMS

Like all dams, Bluestone is not designed to eliminate flooding or hold infinite amounts of storm waters. So there are very large storms that will completely fill up the lake and extreme storms that will require flows to be discharged to prevent dam overtopping. When extreme storm waters must be passed, significant flooding will occur downstream. It's important to remember:

• This flooding would occur whether or not Bluestone Dam was in place.

• This flooding would have been much worse and occurred far more frequently if the dam wasn't there.

• Dam failure would result in the most catastrophic flooding.

BLUESTONE DAM REDUCING, NOT ELIMINATING FLOOD RISKBLUESTONE DAM REDUCING, NOT ELIMINATING FLOOD RISK 8

Bluestone Lake designed to fluctuate 114 feet to temporarily store flood waters

At EL1520 More Inflow than

OutflowPenstock Auxiliary Spillway Emergency Use Only

In bank

Out of bank

9BLUESTONE DAM EXTREME DISCHARGESBLUESTONE DAM EXTREME DISCHARGES If Bluestone Dam Works As Intended Significant Flooding Can Occur

Throughout the New & Kanawha River Valley’s

~190,000 cubic feet per second*

*Niagraffallsinfo.com

* 1/65 Model of Bluestone Dam

Potential Displacement Of Downstream Rock in

Spillway leading to breach

Stability of 1st Stage

BasinStability Stilling Weir

PHASE 5 – ADDRESS SCOUR IN STILLING BASINPHASE 5 – ADDRESS SCOUR IN STILLING BASIN

11PHASE 5 TO BE BUILD IN STAGESPHASE 5 TO BE BUILD IN STAGES

12BLUESTONE DAM: WORKS AS INTENDED DURING EXTREME EVENTSBLUESTONE DAM: WORKS AS INTENDED DURING EXTREME EVENTS

EXCAVATION – 31 00 00

• Dewatering (31 00 00, para. 3.2)

• Exploratory drilling to define founding elevations and line drilled faces – field conditions may require changes to plans

• Core storage and display facility (31 00 00, para. 3.6.14.2)

• Excavation – line drilling, mechanical ex

• stone confinement wall monoliths

• new stilling basin monoliths

• penstock stilling basin exit channel

• Foundation prep

• Restrictions associated with exploratory drilling (31 00 00, para.

3.6.1) and rock excavation (00 80 00, para. 1.24.1)

Joint orientations measured by borehole camera logging of 2011 and 2013 drilling

TYPICAL GEOLOGY

FAULTING, SLIP PLANES

Penstock Basin

Main Stilling Basin

LIFTOFF TESTING – 31 68 11

• 28 existing anchors

• Specific jack from DSI

• Handling of waste water from recesses

• Strain gauge readings from two anchors

• Automation and data acquisition

• Bolts, gaskets, washers, silicone caulk

• Restriction – liftoff testing to be done early in construction (00 80 00, para

1.24.1. and 31 68 11, para. 1.11)

X

GOV’T EQUIPMENT

• Manhole cover lifter

• Beam

• Bearing plate

• Coupler

• Wedges*

SENTINEL BAR ANCHORS – 31 68 14

• Gov’t furnished property: 3-inch threaded epoxy coated bars, couplers, bearing plates, nuts (01 60 00.00 40, para. 3.9)

• Some particular grout additives specified

DRAIN, INSTRUMENTATION, GROUT HOLE DRILLING AND GROUTING -

31 32 23

• Drilling and curtain grouting in dam inspection gallery

• Drilling new drain holes – dam inspection gallery and underdrain system

• Coordination with Gov’t for removal of transducers prior to drilling or grouting in gallery

• Control of cuttings in gallery

• Azimuth, hole alignment, and borehole survey measurements in dam inspection gallery must be accurate

• Restrictions associated with this work (00 80 00, para. 1.24.1. and 31 32 23, para. 1.10)

WORK IN THE MAIN DAM GALLERY – 31 32 25

• Reaming/cleaning of existing drains early in construction, approximately 290 drains

• Reaming/cleaning of new and existing drains near end of construction

• Gov’t QA of reaming/cleaning

• Control of cuttings

• Restrictions associated with drain reaming/cleaning work (00 80 00, para. 1.24.1. and 31 32 25, para. 1.1)

ANCHOR SPECIFICATIONS: 31 68 12 CONVENTIONALLY DRILLED &

31 68 13 DIRECTIONALLY DRILLED

2.4.5.3 Full Anchor Length Encapsulation:

• “The minimum wall thickness for 10 inch diameter corrugated tubing shall be 0.080-inch and smaller diameters shall be minimum 0.060-inch.”

• “Encapsulation tubing rolls not rejected shall be Quality Control (QC) tested for conformance to the specifications.”

3.1.3 Stressing/Testing Equipment:

• “The hydraulic pump systems shall be capable of producing the loads called out in the performance and proof tests and autonomously holding the creep test load with an accuracy of 50psi without manual intervention.”

3.1.3 Stressing/Testing Equipment:

• “No more than four months before a stressing jack is scheduled to be used the jack cylinder breakaway pressure shall be tested.”

3.1.3 Stressing/Testing Equipment:

• “During testing the high pressure side (HPS) of the hydraulic system shall have two gauges and the low pressure side (LPS) shall have one.”

3.1.3 Stressing/Testing Equipment:

• “The Contractor shall submit schematics of the approved stressing/testing equipment systems showing all hydraulic lines, valves and check valves and operating instructions. Prior to testing the 1st anchor the Contractor shall demonstrate and familiarize the Contracting Officer with the operation of the approved stressing/testing equipment systems.”

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Dam Anchors, Stilling Weir, Stilling Weir Apron, Cofferdam, & Right and Left Training Wall Overtopping Protection

DAM ANCHORSDAM ANCHORS 2

• Approximately 500 existing dam anchors – The Contractor will be installing new anchors in close proximity to these.

• Tight drilling tolerances – directional drilling is required

• Anchors are in various locations across the dam – anchors through both the downstream face and near top of dam

• Anchors through near top of dam do not have much room for installation

• Likely change to Monolith 24 anchor locations with amendment

STILLING WEIRSTILLING WEIR 3

• All vertical anchors – generally 4 anchors per monolith required

• Anchor requirements where divider wall passes through weir will be found with the divider wall drawings

• If Contractor notches the weir for construction access – the weir must be placed back to its original geometry and anchored

• Contract has provision to provide a plate on the downstream end of the weir sluice for dewatering

• A sluice bulkhead on each side of the divider wall will need removed

STILLING WEIR APRONSTILLING WEIR APRON 4

• All vertical anchors – generally 10 anchors per monolith required

• Existing apron is heavily reinforced – anticipate rebar when drilling

• Anchor requirements where divider wall is constructed on the stilling weir apron will be found with the divider wall drawings

• Take note of restrictions associated with removing baffles for divider wall construction

EXISTING COFFERDAM – GOVERNMENT FURNISHEDEXISTING COFFERDAM – GOVERNMENT FURNISHED 5

• Consists of 5 cells, 4 arcs, and an upstream and downstream transition. The cells/arcs have a concrete base/cap with granular material in between. The upstream/downstream transitions are concrete with anchors.

• Used for dewatering the right side of the stilling basin. Phase 5 work required on cofferdam prior to demolition/excavation in the stilling basin (additional anchors in upstream transition, anchored thrustblock, see contract restrictions on demolition/excavation).

• Becomes the property of the Contractor at award. No warranty is provided for the cofferdam.

Take note of the Reimbursable Cost for Government Furnished Cofferdam provided in the contract.

• Must be removed upon completion of use.

COFFERDAM WORK FOR PHASE 5 COFFERDAM WORK FOR PHASE 5 6

• Two new anchors are required in the upstream transition of the Government furnished cofferdam.

• Anchored thrustblock is required for the cells, arcs, and downstream transition of the Government furnished cofferdam.

• A new downstream concrete transition is required. Design of the framing and formwork for the transition is the responsibility of Contractor.

• 2 new cells, 1 new arc are required downstream of the downstream transition. The cells/arc have a concrete base/cap with granular material in between.

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 7

• Multiple rows of anchors are required though the right training wall. De-tensioning of existing right training wall anchors is required.

• A new reinforced anchored concrete deflector is to be constructed on the outside face of the training wall. Concrete demolition is required for construction. Waterstops are required at deflector joints.

• Derrick stone is required between the primary basin right training wall. Take note of the option in the contract to use the basin baffles in lieu of the derrick stone.

• An anchored concrete stone confinement wall is required at the downstream end of the right training wall.

• A reinforced concrete sump collector for drainage from the dam inspection gallery is required. Water drains from the sump through a new valve and 18” pipe to downstream of the stone confinement wall. The pipe is embedded in concrete the full length.

• An Operations parking lot stone confinement wall is required on Monolith M111 of the left training wall of the penstock basin.

• The sluice and gate well of Monolith M62 of the right training wall need filled with concrete. The valve, stem and operator need removed prior to filling.

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 8

Anchors, Deflector, Sump Piping, Concrete Demolition

Deflector Reinforcement

Deflector Waterstop

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 9

Stone Confinement Wall - Plan

Stone Confinement Wall - Reinforcement

Stone Confinement Wall - Section

Stone Confinement Wall - Reinforcement

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 10

Sump Collector – General Arrangement

Sump Collector - Section

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 11

Operation’s Parking Lot Stone Confinement Wall - Plan

Stone Confinement Wall - Reinforcement

Operation’s Parking Lot Stone Confinement Wall - Section

Monolith M62 – Sluice and Gate Well filled with concrete

RIGHT TRAINING WALL OVERTOPPING PROTECTION RIGHT TRAINING WALL OVERTOPPING PROTECTION 12

Existing Anchors to be de-tensioned - Elevation

Stone Confinement Wall - Reinforcement

Existing Anchors to be de-tensioned

- Section

LEFT TRAINING WALL OVERTOPPING PROTECTION LEFT TRAINING WALL OVERTOPPING PROTECTION 13

• Demolition of the top of the left training wall and the existing fishing pier is required.

• The left training wall is to be raised - 10 feet on upper level transitioning to five feet at lower level.

• Anchors are required though the left training wall land side face and the training wall raise.

• The new concrete training wall raise is to be reinforced and waterstops are required at the joints.

LEFT TRAINING WALL OVERTOPPING PROTECTION LEFT TRAINING WALL OVERTOPPING PROTECTION 14

Demolition Plan, Elevation & Section

LEFT TRAINING WALL OVERTOPPING PROTECTION LEFT TRAINING WALL OVERTOPPING PROTECTION 15

Left Training Wall Raise

Anchors – Left Training Wall

LEFT TRAINING WALL OVERTOPPING PROTECTION LEFT TRAINING WALL OVERTOPPING PROTECTION

Reinforcement position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

Structural

FLOW DIVERSION

(MOSTLY) CONTRACTOR-DESIGNED

Critical for environmental protection Drawing ST040 – Notes contain important information!

Specifications:

00 80 00 Special Contract Requirements 01 00 00 Contract Considerations 01 57 20.00 10 Environmental Protection (Pay Item)

Installed and functional prior to mobilizing equipment into the right side basin Coordination with operations is required Must remain operational until right side is flowing

File Name

DEMONSTRATION SECTIONS

Drawing S-068, Specification 03 70 00

- Two demonstration sections

- Segment of Supercavitating Baffle

- Segment of Apron Overlay

- Meant to capture challenging elements of construction

- MUST be constructed and satisfactory prior to beginning permanent construction

- Remain in place until basin construction is complete, demolish after

- Contractor to select location (subject to Government approval)

DIVIDER WALL

Divider wall is COMPLICATED

- Sequencing Restrictions / Spec. 00 80 00 (M34T1, M34T2, M77T1, M77T2)

- Heavy Reinforcement

- #18 bars may require mechanical splices

- Specialized support

- Anchors

- Formed holes, installed mid-construction

- Materials not on drawings embedded below anchors subject to GOV approval

- Drains, Gutter, Sump, Instrumentation – features are spread across several drawings

- Leakage Testing, Contractor Responsibility / Spec. 01 00 00

WATERTIGHT DOORS

Two watertight doors in excavated tunnel Existing Adit 2 door total replacement

All classified as Hydraulic Steel Structures

- Fabricator MUST be AISC certified CBR, ABR, or HYD

- Specs have requirements beyond AWS D1.5

- Read Specification 05 29 20 carefully!

Field verify security features, protrusions, and accessories on existing adit door for duplication on new door

APRON OVERLAY

Demolition

- No blasting, Leave no microfractures / Spec. 02 41 01

- Leave sufficient pipe from existing drains for reconnection

- Not all demolition can be done at once (downstream 3 to 4 feet)

Sequencing Restrictions / Spec. 00 80 00

- Apron must be resurfaced and anchored prior to rock excavation downstream

Drains and instrumentation to be placed in overlay concrete

SUPERCAVITATING BAFFLES

New Baffles are INTRICATE

- Some vertical baffle reinforcement is embedded into base lift

- Reinforcement placement tolerances are tight

Armor is not a simple fabrication

- Material is to be duplex stainless steel

- Fabricator must be certified under AWS Certified Welding Fabricator program for D1.6 and have 5 years documented experience with duplex stainless

- Studs to be friction welded (other methods considered if conditions are met)

- Read 05 59 21 carefully! AWS D1.6 requirements have been substantially supplemented

UNDERDRAIN SYSTEM

Specification 31 32 24, S-300 Drawings

Strip System (Apron Extension)

- Formed with infill (“mud mat”) concrete

- 7 days between foundation approval and formwork completion

- Formwork performance criteria

- Special rock fill

Drilled System

- Tight tolerances on risers

- Drilling to commence only after surrounding anchors installed

UNDERDRAIN SYSTEM

Common Work

- Receiver pans

- Piping installed first

- Pans later

- Tight tolerance

- Large radius bends: no kinks, folds, or excessive distortion

- Inspections

- Survey placement

- Post-installation inspection (sphere test)

JOINTS

Drawing S-067

In basin:

- Joints have dowels and waterstops – formwork to accommodate

- Tight tolerance chamfers on transverse joints – divider wall joints included

- Radius on longitudinal joints

Outside basin, typical chamfers

FISHING PIER

Simple – slab on piers

- Drilled shafts into rock

- Formed above rock to elevation of slab

- Piers constructed in the dry, slab may be constructed after cofferdam removal

Potential complications

- Some piers are within granular cofferdam footprint Tremie concrete placed to above level of groundwater

Drawings SR-103, SR-300, SR-504 (Volume 2) Pier Spec. and Pay – Spec. 10 10 00 (will be amended to include pier) Shaft Execution – Spec. 31 63 29 (will be amended to cover pier)

.59

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Work Limits, Embankments and Disposal, Downstream Cofferdam, Box Culverts Greg Adkins Lead Civil Technician

2WORK LIMITS

Major Notes

• As noted on Work Limit drawings points 41, 43 and 44 are not used do to late change

• Two major Dam Safety Assurance (DSA) contractors on site at time of award of Phase 5

• Miller Avenue outside government boundary haul restrictions, SPEC. SECTION 01 50 00

• Maintaining ingress and egress at Adit Door No. 2 at base of Monolith 23

• Main entrance to dam for operation, maintenance and repair

• Foot traffic at all times

• Cooperate with COE operations personnel at times when tools, equipment and machinery need moved in and out of Dam for maintenance and repair

• Share and maintain access along Miller Avenue and temporary routes, inside property boundary, with all other contractors and COE personnel

• Miller Avenue paving, outside of government boundary, not to be performed until all major construction, and heavy truck and equipment traffic has ceased

• Left side access road repaving not to be performed until all major construction, and heavy truck and equipment traffic has ceased

WORK LIMITS CONT’D

Contractors Work Limits (CWL)

• Shown on drawing sheets CS405 and CS406

• Areas available at Notice To Proceed (NTP)

Limited Work Limits 1 (LWL1)

• Shown on drawing sheets CS407 AND CS408

• Marine access from upstream, Leatherwood Landing Boat Launch, to dam

• Shared with Cofferdam Contractor until complete 31 May 2020, future contractors, and COE operations personnel

• Coordination required with COE operations personnel

• Buoyed area just upstream of dam

• Sluice gate operation

• During debris removal

• Launching boats, barges and other marine vehicles

• Material and equipment storage in this area

Limited Work Limits 2 (LWL2)

• Shown on drawing sheet CS409

• Encompasses top of dam

• Shared with Cofferdam Contractor until complete 31 May 2020, Remote Gate Electrical

Contractor until complete 28 Feb. 2020, future contractors and COE operations personnel.

• THESE DATES REFLECTED ON SOME OF THE DRAWINGS IN BID PACKAGE

• ON OTHER DRAWINGS DATES INADVERTENTLY WERE NOT CHANGED, BUT WILL BE, IN

AN AMENDMENT

Limited Work Limits 3 (LWL3)

• Shown on drawing sheet CS409

• Encompasses penstock basin downstream of gates

• Removal and re-installing penstock gate manhole covers for flow diversion

• Constructing and removing portion of granular cofferdam tying into training wall

• No storage of equipment or material

Limited Work Limits 4 (LWL4)

• Shown on drawing sheet CS409

• Basically a path for material (concrete, etc.) transport system and structural supports from batch plant to basin

Limited Work Limits 5 (LWL5)

• Shown on drawing sheet CS409

• Encompasses Miller Avenue from northern property boundary to and encompassing the Operations parking lot at Adit door No. 2 at the base of monolith No. 23

• Shared by all contractors, current and future, and COE Operations personnel

• As the path of this access will be changing throughout the contract period due to construction sequencing the access will follow these temporary routes and shared as described above

Restricted Work Limits 1 (RWL1)

• Shown on drawing sheets CS410 and CS411

• Areas are currently the Cofferdam Contractors Work Limits

• Areas available when the Cofferdam is complete 31 May 2020

• Includes two small areas along route 20 upstream of the dam, the spillway and stilling basin area and the existing access road from Route 20 up to and including the flat area adjacent to the left training wall

• The COE has requested and received permission to use the two small areas along Route 20 from the WVDOH

• The contractor is required to obtain a right-of-way encroachment permit from the WVDOH in order to utilize the two small areas along Route 20

Restricted Work Limits 2 (RWL2)

• Shown on drawing sheet CS411

• Areas are currently the Remote Gate Electrical Contractor Work Limits

• Areas available when the Electrical contract is complete 28 Feb 2020

• Areas include the top of dam monoliths 22, 23 and 24, area atop penstock thrustblock adjacent to the upstream penstock training wall, areas around and including the existing Operations/Maintenance Building, and access to the remote dam operations hut on the east hillside

Restricted Work Limits 3 (RWL3)

• Shown on drawing sheet CS411

• Area of the existing Dam Overlook along Route 20

• Construction to complete Overlook area

• Completed within a continual six month time frame

• Maintain access to the top of dam at all times

• Coordination required with COR prior to beginning this work

Restricted Work Limits 4 (RWL4)

• Shown on drawing sheet CS411

• City of Hinton Lease area adjacent to Miller Avenue near the northern government property boundary (existing baseball field area)

• No access or impact to this area except for installing utilities to existing press box building

• Coordination required with COR and operations personnel to gain access to the press box building

Restricted Work Limits 5 (RWL5)

• Shown on drawing sheet CS411

• Area adjacent (north and west side) to the City of Hinton Lease area

• New Little League Baseball Field area

• Baseball season runs from approximately 1 March through 31 July

• Construction in this area

• Complete within a two consecutive year time frame

• Coordination required with the COR and operations personnel prior to work beginning

Restricted Work Limits 6 (RWL6)

• Shown on drawing sheets CS411 and CS412

• Area encompasses Miller Avenue outside the Government Boundary - to be repaved

• Miller Avenue haul restrictions, SPEC. SECTION 01 50 00

• The complete repaving not to be performed until all major construction, and heavy equipment and truck traffic has ceased

10EMBANKMENTS AND DISPOSAL, SPEC. SECTION 31 23 00

Drawing sheet CS108 New Maintenance Facility area atop disposal (shown in green)

• Must be totally operational prior to existing being demolished

• On-site material for Contractor use (shown in red)

• Located on east side of Miller Avenue at north end (drawing sheet CS108)

• Several thousand cubic yards of material

• Could be moved to New Maintenance Facility area to BEGIN embankment

• Not a sufficient amount of material to complete embankment at New Maintenance Facility

• Material available for other uses as well, such as haul roads

• Excavation Plan required for review and approval

EMBANKMENTS AND DISPOSAL CONT’D, SPEC SECTION 31 23 00

Embankments, fills and backfills shall be constructed from

• Excavated rock

• Excavated soils (overburden)

• Demolished concrete

• Downstream cofferdam materials after demolition

• Cellular cofferdam aggregate fill material after demolition

• Removed aggregate base course material

• Portions of these materials will require processing to meet specifications

• Possibility of having to bring additional material in from commercial source

EMBANKMENTS AND DISPOSAL CONT’D, SPEC. SECTION 31 23 00

Pay Item “Select Rockfill”

• Choice fill material

• No material that meets or can be processed to meet the select rockfill spec will be removed form site Pay Item “Disposal Embankment”

• Demolished concrete

• Any material that does not meet spec for “Select Rockfill”

• Excess taken off-site and disposed of in licensed landfill

EMBANKMENTS AND DISPOSAL CONT’D, SPEC. SECTION 31 23 00

Pay Item “Additional Fill”

• In the case an insufficient amount of material from site to complete the lines and grades as shown on the plans

• Material to be purchased from a commercial source

• Meet the specification for “Select Rockfill” Pay Item “Excess Disposal Material”

• Excess amount of material taken off-site to a licensed landfill

• Must be only material that does not meet or cannot be processed to meet the specification for “Select Rockfill” No material shall be taken off-site until all embankments, fills and backfills are complete

14DOWNSTREAM COFFERDAM, SPEC. SECTION 31 23 00

General notes

• Work Limits 105 feet from downstream apron endsill

• Stream downstream very environmentally sensitive

• No disturbance of stream bottom beyond 105 feet

• Plan on drawing sheet CS406, Typical Section drawing sheets CS103 and CS114

• Rockfill material can be excavated rock from basin

• Strictly follow basin excavation restrictions

• Must be processed to specification in basin or upland

• Details and notes for geomembrane tie-in to riverbank, downstream cellular cofferdam, penstock training wall and basin endwall

• Limits of geomembrane-bottom protective geotextile extends only 5 feet of the 10 foot horizontal section (green line on typical section)

• Rockfill and stone slope protection disposed of on site (stone protection may be re-used in other areas where shown on drawings)

15DOWNSTREAM COFFERDAM CONT’D, SPEC. SECTION 31 23 00

Right side notes

• Shown on drawing sheet CS103

• Ties into downstream cellular cofferdam and left penstock training wall

• Careful not to damage training wall, basin floor, concrete pavement and baffles

• Remove portion of existing dike, to top rock, prior to placing cofferdam embankment

• Layout affords right side basin features, Sump Collector, Training Wall Deflector, Stone

Confinement wall, Parking Slab, Derrick Stone and portion of Basin Endwall to be constructed in the dry

• Fishing Pier drilled shafts can be constructed through cofferdam embankment

16DOWNSTREAM COFFERDAM CONT’D, SPEC. SECTION 31 23 00

Left side notes

• Shown on drawing sheet CS114

• Ties into Basin Endwall and left riverbank

• Contractor may elect to modify layout to afford remainder of Basin Endwall to be constructed in the dry-if so plan shall be submitted for review and approval

• Layout affords basin features to be constructed in the dry

17BOX CULVERTS, SPEC. SECTION 33 40 00

Contractor Designed including wingwalls, splash pads and security grates Paid for by the LF of culvert to include wingwalls, splash pads and security grates Miller Avenue Culvert (5 foot wide by 3 foot high by 434 foot long)

• Shown on drawing sheet CS112

• Replaces existing 42” CMP along same alignment

• Requires temporary crossing when excavating at Miller Avenue crossing

• Temporary means of maintaining flow

• Possible other existing pipes from utilities and land owners flowing into existing

CMP

18BOX CULVERTS CONT’D, SPEC. SECTION 33 40 00

Packs Branch Culvert (5 foot wide by 5 foot high by 284 foot long)

• Shown on drawing sheet CS113

• Temporary means of maintaining flow

• Foot bridge near upstream end to remain

.59

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

Drilled Shafts

FISHING PIER – PLAN VIEW BASIN END WALL – PLAN VIEW

2DRILLED SHAFTS

• 36” Diameter

• Drilled in Bedrock

• Basin End Wall (22)

• Fishing Pier (9)

BASIN END WALL

FISHING PIER

APPROXIMATE LOCATION

DRILLED SHAFT

DRILLED SHAFTS (SPECIFICATION SECTION 31 63 29)

• Sequencing of Holes (see paragraph 1.2 “Submittals”)

• Site Preparation (see paragraph 1.2 “Submittals”)

• Geology (see paragraph 1.5 “Subsurface Data”)

• Measurements for Tolerances (see paragraphs 3.4.4 and 3.8)

• Support of Steel Pile and Reinforcement (see para. 3.5 and 3.7)

• Concrete Placement (see paragraph 3.7 “Installation of Concrete”) position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Instrumentation and the Automated Data Acquisition System (ADAS) For Life Safety During Construction Greg Fosson Instrumentation Specialist

LIFE SAFETY ADAS UNDER SEPARATE CONTRACTLIFE SAFETY ADAS UNDER SEPARATE CONTRACT 2

An ADAS KTR will have full responsibility for the Life- Safety ADAS including sensor installation, data collection and analysis, and monitoring.

The instruments currently being installed in the Stilling Basin Cofferdam Cells and Transitions will have been automated, and that portion of the ADAS will be operating when you mobilize.

LIFE SAFETY ADAS UNDER SEPARATE CONTRACTLIFE SAFETY ADAS UNDER SEPARATE CONTRACT 3

• ADAS KTR will automate D/S Cofferdam instruments installed under this contract

• ADAS KTR install additional instruments

• Spec Section 00 80 00 – Cooperation with ADAS

KTR

• Spec Section 13 05 00 – ADAS Fully Operational

• Important KTR Communicate w/ KO to Coordinate w/ ADAS KTR for ADAS Installation

LIFE SAFETY ADAS UNDER SEPARATE CONTRACTLIFE SAFETY ADAS UNDER SEPARATE CONTRACT 4

• Spec Section 13 05 00 – ESTIMATED time for ADAS KTR to install new instruments

• Spec Section 13 05 00 – You being delayed due to ADAS not functional

• Bid Schedule Line Item #50 covers payment in the event of a delay

• Spec Section 00 80 00 – You evacuating due to ADAS Alarm

• Bid Schedule Line Item #5 covers payment in the event of an ADAS triggered evacuation

• Spec Section 00 80 00 – You being delayed due to ADAS Alarm

• Bid Schedule Line Item #6 covers payment in the event of an ADAS triggered delay

.59

“The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Maintenance Building and Recreation Features Corey Weaver, P.E.

Lead Engineer, Recreation Team

GENERAL OVERVIEW

MAINT. BLDG.

RIGHT REC

LEFT REC

OVERLOOK

SPECIAL CONSIDERATIONS

• Maintenance Buildings - Sheet CR401 (Vol. 2) o Fully operational new facility prior to demolition of existing structure

• Work limits restrictions – Sheet CS411 (Vol. 1) o RWL3 – Overlook – All features must be constructed within a 6 month continual time frame o RWL4 – City of Hinton Lease – No access, except to connect utilities to existing structures/features. Must coordinate with COR and Operations Personnel o RWL5 – New Baseball Diamond Area Hinton Little League: Approximately 01 MAR – 31 JUL All features must be constructed within a 2 year continual time frame Must protect public and maintain safe access to area prior to construction

• Water Vault and RPZ Assembly – Sheet CR114 (Vol. 2) o Must provide 6 months notice to COR prior to date of connection.

• Miller Avenue Final Paving – Sheet CP101 (Vol. 2)

RWL3

RWL4

RWL5

City of Hinton Lease

GOV BOUNDARY

position, policy or decision, unless so designated by other official documentation.”

BLUESTONE DAM SAFETY ASSURANCE MEGA-PROJECT

Phase 5, Pre-Bid Meeting IFB No. W9123719B0001

04 October 2019

Construction Sequencing & Restrictions General Items

CONSTRUCTION SEQUENCING

Specification 01 00 00

- Right Side of the Stilling Basin has to be constructed first including

- Divider Wall

- Right Overtopping Protection

- Contractor shall receive final acceptance of Right Side of Stilling Basin before starting on Left Side of the Stilling Basin

- New Maintenance Building must be constructed prior to initiating demolition of the existing Maintenance Building

CONSTRUCTION RESTRICTIONS

Specification 00 80 00

Before Construction can start on the Right Side of the Stilling Basin:

- Flow Diversion system has to be installed

- Downstream Transition and Cellular and Granular Cofferdams need to be constructed before:

- Dewatering and working in the upstream of basin weir (Exception: if a cover plate is installed at the downstream end of the Stilling Weir Sluices)

- Notching of the Stilling Basin Weir

- Dewatering downstream of the Stilling Basin Weir

Before Construction can start on the Left Side of the Stilling Basin:

- Downstream Granular Cofferdam Dam and Basin End Wall needs to be

Constructed before the following can occur:

- Dewatering and working upstream of the basin weir (Exception: if a cover plate is installed at the downstream end of the Stilling Weir Sluices)

- Notching of the Stilling Basin Weir

- Dewatering downstream of the Stilling Basin Weir

Stilling Basin Construction – Items to Note:

- Work is required on the Cofferdam prior to apron demolition

- Apron construction needs completed prior to excavation

- Construction restrictions with de-tensioning the existing right training wall anchors

- Construction restrictions associated with monolith construction sequence of the divider wall

- Anticipate changes to these restrictions with the forthcoming amendment

GENERAL

• More automated operation

• More automated data collection

• Submission of data – native format, Excel 2013, Microsoft Access

Database format, etc., as well as pdf

• Qualifications

• As-builts