ITB 24-42TM Lake Slide Gate - Construction Specs.pdf

SECTION 110 - SUPPLEMENTARY PROVISIONS

Modifications to Regional Construction Standards

Revision Date: June 23, 2020

Section Sub-Section Name Add/Delete Modification

301 3.A.

MEASUREMENT FOR

PAYMENT

Replace

The cost for clearing and grubbing existing shrubs, landscaping, and any other area marked for clearing and grubbing in the Plans shall be incidental to the cost of the project.

301 3.B.

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PAYMENT

Remove This section is not used.

301 3.F.

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Add The cost for clearing and grubbing trees in the right of way shall be a unit price for each tree, based on the trunk diameter size range, as shown in the Bid Form.

302 All Subsections

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305 All Subsections

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309 All Subsections

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310 All Subsections

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406 All Subsections

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501 All Subsections

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502 3.K.

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1. Concrete steps will be measured in square yards, complete-in-place.

2. Payment will be made at the contract unit price bid per square yard.

505 All Subsections

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510 3.C.

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Add Reinstalled signs shall include new foundation and post.

510 3.F.

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Add

The cost for removing fencing shall be based on the linear footage of the fence to be removed, irrespective of fence material, as shown in the Plans. The cost of reconstructing the fence at the property line is incidental to the cost of removing fencing. The reconstruction of the fencing shall, where possible, use the existing fence materials to match existing. If the City Inspector deems existing fencing materials unsuitable for reconstruction, the Contractor shall purchase new materials to match existing at Contractor's expense.

511 All Subsections

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521 All Subsections

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530 All Subsections

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531 All Subsections

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603 2.2.A.

ESTABLISHMENT AND

MAINTENANCE

Replace

Replace "The Contractor shall assume responsibility for proper care of seeded areas while grass is becoming established for three months after completion of treatment on the entire project, unless desired cover is established in a shorter preiod of time" with "The Contractor shall assume responsibility for proper care of seeded areas while grass is becoming established for twelve months after completion of treatment on the entire project, unless desired cover is established in a shorter preiod of time"

605 All Subsections

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704 3.A.

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Replace "Pavement line markings will be measured and paid for at the contract unit price per linear foot for the type and/or class and width specified. This price" with

"Pavement line markings shall be incidental to the cost of the installation of the pavement. This"

801 3.A.

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802 3.A.

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803 3.A.

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804 3.A.

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805 3.A.

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806 3.A.

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810 3.A.

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110-2

SECTION 110 - SUPPLEMENTARY PROVISIONS

Modifications to Regional Construction Standards

Revision Date: June 23, 2020

Section Sub-Section Name Add/Delete Modification

811 3.A.

MEASUREMENT FOR

PAYMENT

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812 3.A.

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813 3.A.

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814 3.A.

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815 3.A.

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816 3.A.

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817 3.A.

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818 3.A.

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819 3.A.

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820 3.A.

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821 3.A.

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822 3.A.

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110-2

Section

Number Spec Name

Reference

Section

4 Energy Attenuation (Concrete Baffles) 110-4

5 Grated Maintenance Walkway 110-5

6 Stop Logs 110-6

7 Actuators 110-7

8 Pump Around Operation 110-8

9 Slide Gates 110-9

10 Dredging 110-10

11 Deck Railing 110-11

12 Vibration Monitoring 110-12

13 Electrical Conduit 110-13

14 Control Cabinet 110-14

15 Sensor Devices 110-15

16 Turbidity Curtain VDOT 303

17 Coffer Dam VDOT 402

18 Sheetpile VDOT 402

Timber Piles

VDOT 403

20 Dyamic Pile Test VDOT 403

Structural Concrete

VDOT 404 &

VDOT 406

VDOT refers to the 2020 Road and Bridge Standards.

Supplemental Specifications Summary

110- 1

Project: Coliseum Lake Slide Gate

Date: January, 2023 Owner: City of Hampton, Virginia

SECTION 110

SPECIAL PROVISIONS

I. CONSTRUCTION DRAWINGS:

Plans are the property of the Owner and shall not be used for any purposes other than those specified in these Contract Documents.

II. HAMPTON ROADS PLANNING DISTRICT COMMISSION REGIONAL

CONSTRUCTION STANDARDS:

Prior to construction, the Contractor is required to obtain a copy of the Hampton Roads Planning

District Commission Regional Construction Standards, Sixth Edition), from the Hampton Roads

Planning District Commission located in Chesapeake, Virginia.

The following modifications, additions, or deletions to the HRPDC Regional Construction Standards are hereby incorporated into the contract documents.

SECTION 110-4

ENERGY DISSIPATION (CONCRETE BAFFLES)

PART 1 -- GENERAL

1.1 DESCRIPTION OF WORK

A. The Contractor shall furnish all labor, materials, tools, equipment, and incidentals required for installing a concrete apron with baffles to serve as a means of energy dissipation immediately downstream of the slide gate.

B. All Work shall follow Contractors approved Contact Drawings.

1.2 RELATED DOCUMENTS

A. The Contract Drawings have been prepared from existing information consisting of survey drawings and other records. The Contractor is advised that these Contract Drawings may not accurately represent all conditions, and variations are to be expected. The Contractor shall verify the existing conditions to make his own determinations.

B. Drawings and General Provisions of the Contract (Division I), Hampton Roads Planning District

Commission (HRPDC), and Supplemental Specifications (Section 110), apply to this Section.

C. This section has been prepared based on the information contained in the Hydraulic Engineering

Circular Number 14.

1.3 OVERVIEW OF WORK

C. The Work includes but is not limited to:

1. Preparation of creek bed for pouring concrete including the slopes and dimensions as seen on the Contract Documents.

2. Installation of the concrete apron with baffles in a configuration as shown on the Contract

Documents.

3. Preparation of all required submittals specified in Division I of HRPDC specifications.

1.4 RELATED WORK SPECIFIED ELSEWHERE

A. Section VDOT 404 & 406 Structural Concrete

B. Section 110-10 Dredging

1.5 SUBMITTALS

Submittals shall be in accordance to Division I of the HRPDC.

1.6 QUALITY ASSURANCE

A. Contractor shall have documented previous experience in installation work within waterways.

1.7 SITE CONDITIONS

A. Installation of the concrete apron and baffles may require dredging in the subject area, which should be executed per the Dredging Specification, Section 110-10.

B. The Contractor shall make a site inspection and shall assume responsibility for carefully reviewing all contract documents, including reference documents and appendices. The Contractor shall satisfy himself as to the nature and location of the work, the general and local conditions, uncertainties of weather, the water levels in the ditches, or similar physical conditions at the site that may affect the

Work.

C. Any failure by the Contractor to acquaint himself with all the available information will not relieve him from responsibility for properly estimating the difficulty or cost of successfully performing the work.

D. Inspection of the subject area is to be conducted by the Contractor and the Owner to ascertain any damages or deficiencies. Inspection shall document the condition of existing landscaping, shoreline, storm drain outfalls, and other site amenities (pavement, sidewalks, curb, and gutter, etc.).

The Contractor shall repair any damage attributed to the Contractor's operation in a timely manner.

1.8 ENVIRONMENTAL PROTECTION REQUIREMENTS

A. Provide and maintain during the life of the contract, environmental protective measures.

Also, provide environmental protective measures required to correct conditions, such as oil spills or debris that occur during the dredging operations. Comply with Federal, State, and local regulations pertaining to water, air, and noise pollution.

1.9 REGULATORY REQUIREMENTS

A. The Owner has secured multiple permits for the Work. Permits are contained as part of the Contract

Documents. Permitting agencies include but are not limited to the United State Army Corps of

Engineers, Virginia Marine Resource Commission (VMRC), Virginia Department of Environmental

Quality and the City of Hampton Local Wetlands Board.

PART 2 – MATERIALS (NOT USED)

PART 3 -- EXECUTION

3.1 MEETINGS

A. The Contractor shall be responsible for any Notice of Violations (NOV) associated with non-compliance of any permits, laws or regulations.

3.2 CONCRETE WORK

A. Limits of Work: The limit of work is shown on the plans as the Limit of Disturbance. No work shall occur outside this limit.

B. Furnish and set concrete (pre-cast) in footprint to the necessary thickness downstream of the gate structure.

C. Overdredging or changing the morphology of New Market Creek beyond what is shown on the plans is prohibited. The Contractor shall restore or repair any deviations from the Contract Documents.

D. Cast-in-place baffles per Concrete specifications (Section VDOT 404/406) in the configuration as shown on the Contract Documents.

E. The dimension and spacing of baffles shall conform to the Contract Documents. Any deviation will be repaired at the expense of the Contractor.

F. Baffle and concrete apron construction shall comply with the permit restrictions by the City of Hampton and VDOT.

G. PROSECUTION OF THE WORK

1. The prosecution of work shall ensure the stability of slopes and other structures lying on or adjacent to the site of the work. Repair damage resulting from laying concrete, insofar as such damage may be caused to the embankment or downstream creek.

PAYMENT

A. The total quantity of concrete baffles, as described in the sections above, will be paid for at the lump sum price. The above process and payments will be full compensation for all submittals, meetings, inspections, regulatory requirements (both state and local and outlined in the related specifications), installation and acquisition of the various components of the concrete baffles including the concrete apron as detailed in the previous sections.

Pay Item: Energy Dissipation (Concrete Baffles) Pay Unit

Lump Sum (LS)

END OF SECTION

SECTION 110-5

GRATED MAINTENANCE WALKWAY

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. The Contract Drawings have been prepared from existing information consisting of survey drawings and other records. The Contractor is advised that these Contract Drawings may not accurately represent all conditions, and variations are to be expected. The Contractor shall verify the existing conditions to make his own determinations.

B. Drawings and General Provisions of the Contract (Division I), Hampton Roads Planning

District Commission (HRPDC), and Supplemental Specifications (Section 110), apply to this

Section.

1.2 SUMMARY

A. The work shall consist of furnishing, transporting, and installing steel sheet piling as shown on the Construction Drawings.

1.3 PREINSTALLATION MEETINGS

A. Contractor shall conduct a pre-installation meeting with the owner.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Deliver piles to Project site in such quantities and at such times to ensure continuity of installation. Handle and store piles at Project site to prevent buckling or physical damage.

B. Upon delivery of materials to site, contractor shall visually inspect all materials for defects or damage. If serious defect or damage is detected, contractor shall notify Owner immediately. Store bundled sheet piling on a relatively level surface with a slight pitch to allow water to drain.

Contractor should not break bundled sheets until ready for immediate installation.

1.6 FIELD CONDITIONS

A. Site Information: A geotechnical report has been prepared for this Project and is included elsewhere in the Project Manual for information only.

B. Protect structures, underground utilities, and other construction from damage caused by pile driving.

1.7 REGULATORY REQUIREMENTS

The Owner has secured multiple permits for the Work. Permits are contained as part of the

Contract Documents. Permitting agencies include but are not limited to the United State Army

Corps of Engineers, Virginia Marine Resource Commission (VMRC), Virginia Department of

Environmental Quality and the City of Hampton Local Wetlands Board.

The rules and practices contained in this Code are recommended by the NAAMM Metal

Bar Grating Division as standard for the industry. Unless specifically stated otherwise, they shall be considered applicable to, and a part of, all contracts relating to the purchase and supply of metal bar gratings and/or treads.

Unless otherwise specified, all designs and materials shall be in accord with the Standard

Specification for Metal Bar Gratings and Treads as published in the NAAMM Metal Bar

Grating Manual, latest edition, and the NAAMM Metal Bar Grating Engineering Design

Manual, latest edition.

PART 2 - MATERIALS

A. Metal bar grating is an open grid of metal bars. The bearing bars, which have a cross-sectional depth much greater than width, are held at regular spacing usually parallel, either by:

1. Straight, sinuous or corrugated cross bars having their longitudinal axis perpendicular to the bearing bars and being connected to them by wedling, forging or mechanical locking or by

2. Bent connecting bars alternatively contacting adjacent bearing bars and riveted to them at regular intervals

B. A metal bar grating tread is a stair tread consisting of a panel of metal bar grating having a metal nosing section extending along one of its long edges and a carrier angular plate at each end for connection to a stringer.

C. Stainless Steel Gratings. Bearing bars, cross bars, and connecting bars shall be Type 304, 304L, 316 or 316L alloy conforming to ASTM A666.

D. Stainless Steel Rivets shall be of a Type 300 series alloy as prescribed in ASTM A493.

E. Minimum Size of Members shall be the following:

1. Size of bearing bars shall conform to the tolerances shown in the Minimum Standard

Section Page 7, of the Metal Bar Grating Manual.

2. Minimum dimensions of cross bars shall be as shown on Page 7 of the Metal Bar Grating

Manual.

3. Banding bars shall have the following minimum thicknesses:

With rectangular bearing bars, the thickness of the bearing bars to which they are attached

With I-bar section bearing bars, 1/8 inches

F. Information and Regulatory Buoys

PART 3 -EXECUTION

A. Installation of bridge to be tied into reinforced concrete per Contract Drawings.

PART 4 – MEASUREMENT AND PAYMENT

4.1 MEASUREMENT

A. Quantity measurements for gratings ordered to specific dimensions without drawings, shall be based on span times width of each panel, with no deduction made for cutouts.

B. Final calculated grating quantities supplied from drawings shall be on the basis of gross area measured center-to-center supports or back to back of supporting angles or channels or overall dimensions of gratins, whichever is larger, with no deduction for clearances. Allowances for cutouts shall be determined as follows:

a. Deductions in area for circular cutouts will be allowed when the diameter of the cutout exceeds 3.5 feet. The deduction allowance will be equal to one-half the square of the diameter of the cutout.

b. Deductions in area for cutouts other than circular will be allowed only when the cutout area exceeds nine (9) square feet.

c. No deductions will be allowed for any triangular segment or corners of gratings wasted in skew cuts.

4.2 BASIS OF PAYMENT

A. The total quantity associated with the girder bridge, as described in the sections above, will be paid for at the lump sum price. The above process and payments will be full compensation for all submittals, meetings, inspections, regulatory requirements (both state and local and outlined in the related specifications), installation, onsite testing and acquisition of the various components of the girder bridge as detailed in the previous sections.

Pay Item Pay Unit

Grated Maintenance Walkway Lump Sum (LS)

SECTION 110-6

STOP LOGS

1.1 DESCRIPTION OF WORK

Stainless steel stop logs including lifting beams shall be of the size and mounting type shown on the drawings and specified herein. Log and lifting beam design shall be such that the flexural stresses do not exceed 1/4 of ultimate strength. The design flexural stress of stainless shall not exceed 15,000 psi.

1.2 RELATED DOCUMENTS

A. The Contract Drawings have been prepared from existing information consisting of survey drawings and other records. The Contractor is advised that these Contract Drawings may not accurately represent all conditions, and variations are to be expected. The Contractor shall verify the existing conditions to make his own determinations.

B. Drawings and General Provisions of the Contract (Division I), Hampton Roads Planning District

Commission (HRPDC), and Supplemental Specifications (Section 110), apply to this Section.

1.3 OVERVIEW OF WORK

A. The Work includes but is not limited to:

1. Acquisition of stops logs in quantity needed to block the entire clear opening as shown on the

Contract Documents.

2. Preparation of structure and frame for stop log installation.

3. Installation and testing of stop logs.

4. Preparation of all required submittals specified in Division I of HRPDC specifications.

1.4 QUALITY ASSURANCE

A. Materials of Construction shall be Stainless Steel (304L)(minimum thickenss of ¼ in.)

B. Lifting Beam shall be ASTM A36 Hot Dip Galvanized or ASTM A444.

C. Seals shall be Neoprene D2000 grade 1BE625.

1. Seals shall be permanently attached to sides and bottom of each panel. Seal shall be formed all around the waterway channel and between each stop log panel.

D. Guides Ultra-High Molecular Weight (UHMW) Polyethylene.

E. Hooks & Fasteners shall be Stainless steel, ASTM A276, Type 304

F. Guide Wheels shall be Phenolic or polyolefin.

G. Stop Log Panels

Stop log panels shall be of height shown on the drawings and in height increments of 6 in. Panels made of two or more logs shall be securely welded together to form a unit and joints shall be made watertight with neoprene seals or seal welding. Each panel shall have two stainless steel hooks to engage the lifting beam. Panel surface shall be mill finish. Adequate drainage shall be provided for each log. Stop log panels shall be furnished with UHMW guide surfaces to eliminate metal-to-metal contact with slots during insertion and removal.

H. Sill shall be constructed from stainless steel plate shall be provided. It shall be adjustable-mounted to provide flat level seal surface prior to grouting. Finish will be mill finish. Alternatively, flat level concrete invert surface may be provided. Flatness shall be within 1/8 in. in 10 ft of length.

G. Slots shall be fabricated stainless steel (304L) suitable for embedment or mounting on channel wall surfaces.

Surface shall be mill finish.

H. Lifting beam shall be gravity-engaged and lanyard-release type suitable for inserting, retrieving and handling stop log panels. The beam shall be furnished with non-metallic wheels to guide the beam in the stop log slot. The lifting beam may, at the manufacturer’s option, be adjustable in widths to accommodate several widths of stop log openings. Beam shall be complete with large center lifting eye and center-guided, galvanized, lanyard-release cable.

1.5 REGULATORY REQUIREMENTS

A. The Owner has secured multiple permits for the Work. Permits are contained as part of the Contract

Documents. Permitting agencies include but are not limited to the United State Army Corps of Engineers, Virginia Marine Resource Commission (VMRC), Virginia Department of Environmental Quality and the

City of Hampton Local Wetlands Board.

A. The total quantity of Stop Logs, as described in the sections above, will be paid for at the lump sum price. The above process and payments will be full compensation for all submittals, meetings, inspections, regulatory requirements (both state and local and outlined in the related specifications), installation and acquisition of the stop logs and the structural to frame the stop logs in front of and behind the gate as detailed in the previous sections and the other Contract

Documents.

Pay Item: Stop Logs Pay Unit Each (EA)

SECTION 110-7

ACTUATORS

PART 1 -- GENERAL

1.1 DESCRIPTION OF WORK

A. The Contractor shall furnish all labor, materials, tools, equipment, and incidentals required for installing actuators on the superstructure of the slide gate structure.

1.2 RELATED DOCUMENTS

A. The Contract Drawings have been prepared from existing information consisting of survey drawings and other records. The Contractor is advised that these Contract Drawings may not accurately represent all conditions, and variations are to be expected. The Contractor shall verify the existing conditions to make his own determinations.

B. Drawings and General Provisions of the Contract (Division I), Hampton Roads Planning District

Commission (HRPDC), and Supplemental Specifications (Section 110), apply to this Section.

1.3 OVERVIEW OF WORK

B. The Work includes but is not limited to:

1. Preparation of superstructure for fastening of actuator above slide gates.

2. Installation of two actuators in a configuration as shown on the Contract Documents.

3. Preparation of all required submittals specified in Division I of HRPDC specifications.

1.4 RELATED WORK SPECIFIED ELSEWHERE

A. Section VDOT 404 & 406 Structural Concrete

B. Section 110-9 Slide Gates

1.5 SUBMITTALS

Submittals shall be in accordance to Division I of the HRPDC.

1.6 QUALITY ASSURANCE

A. Contractor shall have documented previous experience in installation work within waterways.

1.7 SITE CONDITIONS

A. The Contractor shall make a site inspection and shall assume responsibility for carefully reviewing all contract documents, including reference documents and appendices. The Contractor shall satisfy himself as to the nature and location of the work, the general and local conditions, uncertainties of weather, the water levels in the ditches, or similar physical conditions at the site that may affect the Work.

B. Any failure by the Contractor to acquaint himself with all the available information will not relieve him from responsibility for properly estimating the difficulty or cost of successfully performing the work.

C. Inspection of the subject area is to be conducted by the Contractor and the Owner to ascertain any damages or deficiencies. Inspection shall document the condition of existing landscaping, shoreline, storm drain outfalls, and other site amenities (pavement, sidewalks, curb, and gutter, etc.). The Contractor shall repair any damage attributed to the Contractor's operation in a timely manner.

1.8 ENVIRONMENTAL PROTECTION REQUIREMENTS

Also, provide environmental protective measures required to correct conditions, such as oil spills or debris that occur during the dredging operations. Comply with Federal, State,

1.9 REGULATORY REQUIREMENTS

A. The Owner has secured multiple permits for the Work. Permits are contained as part of the Contract

Documents. Permitting agencies include but are not limited to the United State Army Corps of Engineers, Virginia Marine Resource Commission (VMRC), Virginia Department of Environmental Quality and the

City of Hampton Local Wetlands Board.

PART 2 – MATERIALS

2.1 The actuator shall consist of the following materials and appurtenances.

A. The actuator shall consist of an electric motor, worm gear reduction, absolute position encoder, electronic torque sensor, mechanically and electrically interlocked reversing motor contactor, electronic control, protection, and monitoring package, manual override handwheel, valve interface bushing, 32-character graphical LCD (Liquid Crystal Display), and local control switches all contained in an enclosure that is sealed to NEMA 4, 4X, 6, IP68 to 15M for 96 hours, and (XP as required). Actuator design life shall be at least one million drive sleeve turns. The actuator shall include a removable drive sleeve for machining per valve or gear box requirements.

B. The multi-turn gear box, if required, shall be specifically designed for use with electric motor operators and be manufactured from high strength, high quality materials to provide maximum service and dependability.

All gears shall be machined from high strength alloy steel, ensuring minimum backlash and smooth operation. Input and output bevel gears, as well as the bevel pinion, shall be supported on anti-friction roller bearings and be permanently lubricated to provide maximum efficiency. A top entry splined bronze alloy stem nut shall be easily removable for machining per valve requirements. The multi-turn gear box shall be fully weatherproof (Nema 4) and designed for outdoor service.

C. The power transmission shall be completely bearing-supported and consist of a hardened alloy steel worm and bronze alloy worm gear; oil-bath lubricated using synthetic oil designed specifically for extreme pressure worm and worm gear transmission service.

D. The motor shall be single-phase/120VAC/60-cycle with Class F insulation and a thermistor embedded within the motor windings to prevent damage due to overload. The motor shall be easily removed through the use of a plug-in connector and shaft coupling. The Actuator’s oil shall not be exposed or required to be drained during the removal or replacement of a motor.

E. Valve position shall be sensed by an 18-bit, optical, absolute position encoder with redundant position sensing circuits designed for Built-In-Self-Test [BIST]. Each of the position sensing circuits shall be redundant permitting up to 50% fault tolerance before the position is incorrectly reported. The BIST feature shall discern which failures signal a warning only and which require a warning plus safe shutdown of the actuator. Open and closed positions shall be stored in permanent, nonvolatile memory. The encoder shall measure valve position at all times, including both motor and handwheel operation, with or without power present, and without the use of a battery. The absolute encoder will be capable of resolving ±7o of output shaft position over10,000 output drive rotations.

F. An electronic torque sensor shall be included. The torque limit may be adjusted from 40-100% of rating in

1% increments. The motor shall be deenergized if the torque limit is exceeded. A boost function shall be included to prevent torque trip during initial valve unseating and during extreme arctic temperature operation (-50°C), and a “Jammed Valve” protection feature, with automatic retry sequence, shall be incorporated to de-energize the motor if no movement occurs.

G. The control module shall include power and logic circuit boards, control transformer, and at least two primary power protection fuses, all mounted to a steel plate and attached in the control compartment with captive screws. The use of O rings or other such devices to secure the control boards shall not be permitted.

The module shall be easily removed through the use of plug-in connectors. The module shall also include a reversing contactor, local control switches, 32-character graphical LCD, and LED indicators. It shall also be

Bluetooth ready. All internal wiring shall be flame-resistant, rated 105°C, and UL/CSA listed. Voltage shall be selectable via a jumper included on the power board.

H. The reversing contactor shall be mechanically and electrically interlocked to prevent simultaneous energizing of the open and close coils. The control module shall also include an auto reversal delay to inhibit high current surges caused by rapid motor reversals. The control transformer shall include vacuum-impregnated coils and dual primary fuses.

I. A Phase Correction circuit shall be included to correct motor rotation faults caused by incorrect site wiring.

The phase correction circuit shall also detect the loss of a phase and disable operation to prevent motor damage. The monitor relay shall trip and an error message shall be displayed on the LCD screen when loss of phase occurs and indicate the fault for Remote operation.

J. Discrete remote control may be configured as 2, 3, or 4 wires for open-stop-close control. Remote control functions may be powered by external 24 VDC, 125 VAC, or the actuator’s internal supply 24 VDC supply.

The voltage values for signal threshold shall be 19.2V AC/DC and 5.0V AC/DC respectively. The maximum load for 24Vdc is 2mA. The internal supplies shall be protected against over current and short circuits faults and utilize optical isolation to minimize electro-magnetic interference. Discrete control shall have an isolated common.

K. ESD (Emergency Shut Down) provision shall be included in each actuator. The actuator shall permit up to three inputs for ESD and they shall be configurable. The ESD signal shall override any existing signal

(except LOCAL, STOP, and INHIBIT) and send the valve to its configured emergency position. The ESD may also be configured to override LOCAL, STOP, and/or INHIBIT. Provision for an isolated common shall be provided.

L. Inhibit movement provision shall be included in each actuator. The actuator shall permit up to three inputs for Inhibits and they shall be configurable. Provision for an isolated common shall also be provided.

M. Terminals shall be included to connect the electronic controls package, including display, to a back-up 24

VDC power source. As a standard alternative the actuator shall have the ability to maintain the status and alarm contacts in order to update status to the control room and also provides status visibility on the

LCD screen without main power applied. It should be configurable for at least one hour and, once main power is restored, be available for the next unforeseen power outage. The use of an integral battery is prohibited.

N. A dedicated circuit to prevent undesired valve operation in the event of an internal circuit fault or erratic command signal shall be included. A single point failure will not result in erratic actuator movement. An open or short-circuit in the internal circuit board logic shall not energize the motor contactor, nor shall a single fused control relay contact fail to deenergize the motor contactor. The command inputs shall be optically coupled and require a pulse width of at least 250 ms to 350 ms to turn on or off. In the event of an internal circuit fault, an alarm shall be signaled by tripping the Monitor Relay and through LCD indication.

O. Four latched status contacts rated 125VAC, 0.5A and 30VDC, 2 amps shall be provided for remote indication of valve position, configured as 1-N/O and 1-N/C for both the open and closed positions. Two contacts may be configured to represent any other actuator status; mid-travel position, switched to local, overtorque, motor over temperature, manual operation, switched to remote, switched to stop, valve moving, close torque switch, open torque switch, hardware failure, ESD active, inhibits active, valve jammed, analog IP (input) lost, lost phase, and network controlled.

P. A monitor relay shall be included and shall trip when the actuator is not available for remote operation.

Both N/O and N/C contacts shall be included, rated 125VAC, 0.5A and 30VDC, 2 amps. The monitor relay shall be configurable for three additional fault indications; lost phase, valve jammed, and motor overtemp.

The yellow LED shall blink when the monitor relay is active.

Q. The ACP (Actuator Control Panel) cover & module shall use solid-state Hall-effect devices for local communication and configuration. The use of reed switches on the module is prohibited. A 32-character, graphical LCD shall be included to display valve position as a percent of open, 0-100%, and current actuator status. “STATUS OK” shall be displayed for an operable actuator. If the actuator is not operable, the appropriate alarm shall be displayed. The alarm shall be continuously displayed until the actuator is operable. Red, green, and yellow LEDs shall be included for open, close, stopped, and moving indication.

The Red and Green LEDs shall be reversible. A padlockable LOCAL-STOP-REMOTE switch and an

OPEN-CLOSE switch shall be included for local valve actuator control. The control switches shall not penetrate the controls cover and shall be designed to electrically isolate the actuator’s internal components from the external environment. The OPEN-CLOSE switch may be configured for maintained or push-to-run (inching) control.

R. The device shall be non-intrusive - All calibration shall be possible without removing any covers and without the use of any special tools. All calibration shall be performed in clear text languages; no icons shall be used. The languages shall be English, Spanish, French, German, Portuguese, Italian, Mandarin, Russian, Malay, and Katakana. All calibration shall be performed by answering the “YES” and “NO” questions displayed on the LCD. “YES” is signaled by using the OPEN switch and “NO” by using the

CLOSE switch, as indicated adjacent to the switches. A configurable password option shall be available to prevent unauthorized changes.

S. Double sealed terminal compartment & Terminal block - All customer connections shall be located in a terminal chamber that is separately sealed from all other actuator components. Site wiring shall not expose actuator components to the environment. The internal sealing within the terminal chamber is suitable for

NEMA 4, 6, and IP68 to 15M for 96 hours. The chamber shall include screw-type terminals, three for power and 54 for control, for site connections. Three conduit entries, available as: (2) - 1.25" NPT (M32) and (1)-1.5" NPT (M40) shall be located in the terminal chamber.

T. Coatings - The actuator shall be coated with a polymer powder coat. The coating system shall be suitable for an ASTM B117 salt spray test of 1500 hours. External fasteners shall be stainless steel or high-strength carbon steel that has been chromate-hexavalent coated, and then top coated with a high-strength, high-endurance polymer. The fasteners shall be suitable for an ASTM B117 salt spray test of 500 hours.

U. A handwheel and declutch lever shall be provided for manual operation. The handwheel shall not rotate during electric operation nor can a seized motor prevent manual operation. Changing from motor to manual operation is accomplished by engaging the declutch lever. Energizing the motor shall return the actuator to motor operation. The lever to enable the declutch shall be padlockable to permit motor operation only.

V. The actuator shall include a removable torque or thrust bushing to mate with the valve shaft.

W. Diagnostic facilities shall be included to accumulate and report the performance of the motor, encoder, contactor, cycle time, handwheel operations, actuator ID, firmware revision, and output turns. In addition, a torque profile of the reference baseline valve stroke and the last valve stroke shall be included. The actuator shall contain the ability for diagnostics information to be downloaded to a PC or PDA via both IRDA and

Bluetooth ports.

X. Factory testing - Every actuator shall be factory tested to verify: rated output torque, output speed, handwheel operation, local control, control power supply, valve jammed function, all customer inputs and outputs, motor current, motor thermistor, LCD and LED operation, direction of rotation, microprocessor checks, and position-sensor checks. A report confirming successful completion of testing shall be included with the actuator. Standardized or historic test data shall not be a substitute for torque testing of every actuator.

Y. The Actuator Controls shall provide position control for up to four selectable positions in both the local and remote control modes. The positions shall be adjustable as specified for the application. The actuator shall move to any of the described positions from any other position upon receiving a command.

Z. Remote Control shall be by a discreet contact activation for each desired position. The control signal shall utilize the actuators optically isolated 24 VDC power supply or an externally supplied, 120 VAC, control power. Analog signals shall not be required for mid position control.

AA. Position Limit contacts shall be activated to confirm the desired position has been reached. The limit contacts shall be rated 5 amps at 120 VAC power and be configurable to open, close or flash when activated and shall not activate or flash when a position location is passed in route to another position.

AB. Local Controls shall include a Local -Stop- Remote sector switch and a Raise/ Lower selection switch, LED position lights, and a LCD digital position and command display. When the ”Local” mode is selected, the actuator shall allow both stepping between preset weir positions or moving to the full raised or full lowered position without stopping. Local control shall not be active when either “Remote” or “Stop” are selected.

AC. Calibration and position adjustments shall be completed non-intrusively from the digital display of the actuator by answering “YES” or “No” questions with the actuator’s selector knobs. When hand held devices are required for calibration, a device must be provided with each actuator.

AD. Analog Position Transmitter (APT) Option. If required, a non-contacting, internally powered, electrically isolated position transmitter shall be included to provide a 4-20 mA signal that is proportional to valve position.

AE. Modutronic Option. A controller that alters valve position in proportion to a 4-20 mA analog command signal shall be included. Positioning shall be accomplished by comparing the command signal to an internal position feedback. The internal feedback shall be of the non-contacting type. An automatic pulsing feature to prevent overshoot at the setpoint shall be included. Proportional bands, deadband, signal polarity, motion inhibits time, and fail position shall be adjustable through the LCD. Deadband shall be adjustable to 0.5% full span.

AF. Relays for Status and Alarms Option. Up to eight additional latching output contacts rated 250 VAC/30

VDC, 5 amps and configurable to represent any actuator status in either N/O or N/C state shall be available:

mid-travel position, switched to local, overtorque, motor over temperature, manual operation, switched to remote, switched to stop, valve moving, close torque switch, open torque switch, hardware failure, ESD active, inhibits active, valve jammed, analog IP (input) lost, lost phase, and network controlled.

AG. A two-speed timer that permits the motor to be pulsed to achieve a longer stroking time shall be included.

The pulsing mode may be configured for the open and/or close direction, for any portion of valve stroke with the ON pulse cycles configurable from 0.5-20 seconds and the OFF pulse cycles configurable from 1-

200 seconds.

AH. A Bluetooth option shall be available which permits a User to download or upload configuration routines via standard low power wireless communication path to an actuator. The actuator shall communicate via

Bluetooth to a Bluetooth equipped PC, PDA, Cell Phone, compatible with Windows Mobile 5 platform and actuator diagnostics GUI (Graphical User Interface) software. The BT (Bluetooth) option shall contain

FHSS (Frequency Hopping Spread Spectrum) which permits reliable communication link even in a “noisy” environment. The BT (Bluetooth) option shall contain 128 bit data encryption enabled to protect the privacy of the link. BT communication shall be accessible up to 10m from the actuator in all directions. The ability to enable the Bluetooth communication link shall be password protected. A visible blue LED in the controls LCD window shall be included to signify an active Bluetooth link to the actuator is established.

AI. An auxiliary control station shall be provided in a separate enclosure for control of the actuator. The enclosure shall meet the same requirements as the actuator and shall be suitable for either surface mounting or stanchion mounting. The control station shall include two selector switches (one for OPEN-STOP-

CLOSE) function and two lights for position indication (RED for OPEN and GREEN for CLOSED). The other selector switch shall include three positions (LOCAL-OFF-REMOTE). The selector switch shall be padlockable in each position. The enclosure shall have two conduit entries for control wiring.

3.1 MEETINGS

A. The Contractor shall be responsible for any Notice of Violations (NOV) associated with non-compliance of any permits, laws or regulations.

3.2 INSTALLATION WORK

A. Limits of Work: The limit of work is shown on the plans as the Limit of Disturbance. No work shall occur outside this limit.

B. Fasten and install actuator on superstructure per the gate specifications in

3.3 PROSECUTION OF WORK

A. The Contractor shall ensure that the actuator is fastened to the superstructure such that the live and dead loads do not cause any movement around the fasteners and the actuator.

A. The total quantity of actuators, as described in the sections above, will be paid for at the lump sum price.

The above process and payments will be full compensation for all submittals, meetings, inspections, regulatory requirements (both state and local and outlined in the related specifications), installation, fastening to the gate structure, and acquisition of the various components of the actuator and its appurtenances as detailed in the previous sections.

Pay Item: ACTUATORS Pay Unit

PUMP-AROUND OPERATION 312319 - 1

SECTION 110-8

PUMP AROUND OPERATION

PART 1 - GENERAL

1.1 DESCRIPTION

A. The work covered by this section consists of furnishing, installing, maintaining and removing a stream pump-around system to be used on this project.

1.2 RELATED DOCUMENTS

A. The Contract Drawings have been prepared from existing information consisting of survey drawings and other records. The Contractor is advised that these Contract Drawings may not accurately represent all conditions, and variations are to be expected. The Contractor shall verify the existing conditions to make his own determinations.

B. Drawings and General Provisions of the Contract (Division I), Hampton Roads Planning

District Commission (HRPDC), and Supplemental Specifications (Section 110), apply to this

Section.

1.3 SUBMITTALS

A. Obtain approval from City inspector for location of dewatering bag.

PART 2 - MATERIALS

2.1 PERFORMANCE REQUIREMENTS

A. All channel stabilization improvements are to be performed “in the dry”.

B. The progression of the work shall be done in such a manner that disturbed areas will be stabilized prior to the end of each work day as well as predicted rain fall events.

C. Design, furnish, install, test, operate, monitor, and maintain a stream pump around system of sufficient scope, size, and capacity to divert stream base flow around the work area as specified in the Drawings.

1. Continuously monitor and maintain pump-around operations to prevent base flow intrusion into the work area.

D. Upon setting up pump around operation and initiating channel stabilization improvements, the contractor shall perform these improvements as expeditiously as possible. As soon as the constructed riffle and rock vanes are in place, and the top of the rock wall is brought above base flow elevations, the pump around operation shall no longer be required.

PUMP-AROUND OPERATION 312319 - 2

E. The pump around operation shall only be implemented during working hours. At the end of each work day, the work areas shall be stabilized and stream flow shall be diverted as needed to eliminate the need for bypass pumping during non-working hours.

F. The contractor shall develop his/her own estimate of base-flow at the time of construction and use an appropriate size pump. The pump shall include a hose of sufficient length bypass the work area.

G. Regulatory Requirements: Comply with governing EPA notification regulations before beginning dewatering. Comply with water- and debris-disposal regulations of authorities having jurisdiction.

H. Sound attenuated pumps shall be utilized given the proximity to residential areas.

2.2 DEWATERING BAG

A. Provide in accordance with VDOT Standard EC-8.

B. Provide temporary impervious dikes in accordance with the drawings.

PART 3 -

PART 3 - EXECUTION

3.1 OPERATION

A. Install dewatering bag, bypass pump, and dewatering pump.

B. Install a temporary impervious dike to isolate the work area and begin bypass pumping around the work area.

C. Install downstream temporary impervious dike and begin dewatering the isolated work area.

D. Remove any accumulated sediment before removal of impervious dikes.

E. Upon completion of work in the area, move the impervious dike and pump system. Stabilize the area of the pump intake and outlet immediately following removal of the pump around system.

F. Refuel and maintain pumps for the duration of the pump around operation.

G. Remove pump around operation when no longer required for construction.

3.2 PROTECTION

A. Protect and maintain dewatering system during dewatering operations.

B. Promptly repair damages to adjacent facilities caused by dewatering.

PUMP-AROUND OPERATION 312319 - 3

PART 4 - MEASUREMENT AND PAYMENT

A. Pump-Around Operation will be paid for by the actual number of days in which the Pump-

Around Operation is fully operational.

B. Pump-Around Operation, measured as provided above, will be paid for at the contract unit price per day for “Pump-Around Operation”. The above process and payment will be full compensation for all submittals, materials, installation, operation; including furnishing, installing, and relocating pumps, hoses, dewatering bags, and energy dissipaters; refueling and maintaining pumps for the duration of the pump-around operation, installing and relocating temporary diversion dikes; and all other labor, equipment, and incidentals necessary to execute the requirements of this section.

C. Pay Item Pay Unit

Pump-Around Operation Day (DY)

SECTION 110-9

Slide Gates

PART 1 – GENERAL

1.1 SUMMARY

A. The Contractor shall provide all labor, materials, equipment, and incidentals required to furnish and install slide gates, operating stems, and operating floor stands, complete and operational with all necessary accessories as shown on the Contract Drawings, as specified herein, or as required for complete operation. Slide gates shall be provided at the following locations:

B. The Contractor shall obtain all equipment specified in this Section from one manufacturer to ensure proper coordination and functionality. The manufacturer shall have responsibility for performance and compatibility of the entire system. This does in no way relieve the Contractor for ultimate responsibility under this Contract for equipment, coordination, installation, operation and guarantee.

C. The Contract Drawings are for purpose of guidance and to show functional features and required external connections. They do not necessarily show all components necessary to accomplish the desired results nor do they necessarily show all components required to interface with the equipment. The Contractor shall provide all parts, equipment, and devices necessary to meet the functional requirements of the system.

1.2 REFERENCES

A. Comply with applicable provisions and recommendations of the following, except as otherwise shown or specified:

1. American Water Works Association (AWWA C561)

2. American National Standards Institute (ANSI)

3. American Society for Testing and Materials (ASTM)

1.3 SYSTEM DESCRIPTION

A. Design Requirements:

1. The slide gates shall be manufactured in accordance with the latest version of AWWA

C561, shall be constructed of stainless steel (ASTM 304L or 316L).

2. Liberal safety factors will be used in the design of all equipment. Gate, frame, and yoke design shall be such that the flexural stress does not exceed 18,750 psi or that the minimum safety factor is 4-to-1 based on the ultimate strength of the material used.

3. Slide gates shall be provided in accordance with the Schedule below:

Location Tag Opening Size

(Width x Height)

Operating Head

(Seating/Unseating)

Design Head

(Seating/Unseating)

Thimble Type Operator Type Other

1.4 SUBMITTALS

A. For approval: Submit the following shop drawings for approval:

1. Manufacturer’s information, specifications, and data showing dimensions, materials of construction, and weight of all major items of equipment.

2. Installation diagrams showing location, arrangement, and size of all fasteners required for the equipment.

3. Setting drawings, templates, and instructions for installation of frames, thimbles, etc.

4. Certification that all components were designed based upon the maximum seating and unseating heads described herein.

B. Upon completion of installation, submit three (3) copies of the Operation and Maintenance Manual for this equipment.