00010433_Att B_Special Provisions.docx

ATTACHMENT B – SPECIAL PROVISIONS

OR202 MP40.62 Birkenfeld Bridge Structural Inlay These Special Provisions identify and modify certain sections of the Standard Specifications which are incorporated into this ITB and resulting Contract in ITB Section C.2.6. The Standard Specifications are available online at:

https://www.oregon.gov/odot/Business/Specs/2024_STANDARD_SPECIFICATIONS.pdf

All number references in the special provisions shall be understood to refer to the sections and subsections of the Standard Specifications bearing like numbers.

SECTION 00220 - ACCOMMODATIONS FOR PUBLIC TRAFFIC

Comply with Section 00220 of the Standard Specifications modified as follows:

00220.40(e)(1) Closed Lanes - Replace this subsection, except for the subsection number and title, with the following:

Traffic Lanes may be closed on the Nehalem Highway OR202 when allowed, shown, or directed during the following periods of time except as specified in 00220.40(e)(2):

Single Lane Closures – One Traffic Lane on the Nehalem Highway OR202 may be closed during the following times:

Daily, Monday through Friday, all hours.

Add the following subsection:

00220.45 Load Restrictions on Bridges -

For Structure No.03139A, limit the combined weight of construction vehicles, Equipment, and daily Material usage to 65,000 pounds for every 1,000 square feet of surface area plus the weight of long term storage of Materials to 25,000 pounds for every 100 square feet of surface area of the Bridge or a total of 200,000 pounds for each span of the Bridge, whichever is less.

The Contractor may request alternate loadings by submitting, 30 Calendar Days before proposed loadings, stamped loading calculations and data according to 00150.35

SECTION 00222 – TEMPORARY TRAFFIC CONTROL SIGNS

Comply with Section 00222 of the Standard Specifications modified as follows:

00222.45(b) Portable Changeable Message Signs - Add the following bullet to the end of this subsection:

At least seven Calendar Days before any lane closure, place one or more PCMS displaying the following message as shown, or as directed:

SECTION 00290 - ENVIRONMENTAL PROTECTION

Comply with Section 00290 of the Standard Specifications modified as follows:

Add the following subsection:

00290.30(a)(7) Water Quality:

Do not discharge water contaminated by pollutants including sediment, drilling fluids and waste, concrete, grout, or water contained within a work area isolation, into any waters of the State or U.S. or conveyances draining thereto until it has been treated using Materials such as those listed in 00280.15 or 00280.16 or by pumping to a vegetated upland location. Do not allow Project discharges to increase the concentration of any pollutant in the receiving water to a level that exceeds the limits prescribed by OAR 340‑041.

Do not use permanent stormwater quality treatment facilities to treat construction runoff unless prescribed by an ESCP approved under Section 00280.

If construction discharge water is released using an outfall or diffuser port, do not exceed velocities more than 4 feet per second, and do not exceed an aperture size of 1 inch.

Implement containment measures adequate to prevent pollutants from entering waters of the State or U.S. Such pollutants include but are not limited to construction and demolition materials, waste spoils, fuel or petroleum products, detergents, silt, welding slag and grindings, concrete sawcutting by-products and sandblasting abrasives.

Do not allow curing concrete or grout to be submerged within waters of the State or U.S. less than 24 hours after placement, except within work area isolation. Do not end-dump riprap into the waters of the State or U.S. Place riprap from above the ordinary high water line.

Monitor weather and streamflow forecasts and conditions to anticipate high flows that may unintentionally inundate any portion of the Project Site.

If high flow conditions occur or are anticipated to occur that may unintentionally inundate any portion of the Project Site, remove all potentially affected Equipment, Materials, and debris from the potential inundation area. Cease Work in the area until water recedes and the risk of further high water events passes. The Engineer retains the authority to temporarily halt or modify the Work in case of excessive turbidity or damage to natural resources.

If Work in or around waters of the State or U.S. violate permit conditions or any requirement of this subsection, stop such Work and notify the Engineer.

SECTION 00505 – CONCRETE DECK HYDRODEMOLITION

Section 00505, which is not a Standard Specification, is included in this Project by Special Provision.

Description

00505.00 Scope ‑ This Work consists of partial depth removal and preparing of concrete decks for structural concrete overlays and inlays with hydrodemolition Equipment and associated operations.

00505.01 Definitions and References:

(a) Definitions:

Blow-through ‑ An unanticipated full-depth removal of deck concrete during hydrodemolition operations.

Selective Hydrodemolition ‑ Preparation of deck concrete with hydrodemolition Equipment that creates a scarified surface profile and removes approximately 1/2 inch of concrete in areas of sound concrete and Unsound Concrete is removed in the same operation.

Deep Cut Hydrodemolition ‑ Removal of deck concrete to the depth shown or specified.

Unsound Concrete ‑ Delaminated or otherwise deteriorated concrete identified by a deck delamination survey or during surface preparation operations.

(b) References ‑ In these Specifications, the reference ICRI 310.3R refers to Guideline No. 310.3R, Guide for the Preparation of Concrete Surfaces for Repair Using Hydrodemolition Methods.

00505.02 Submittals ‑ Submit the following to the Engineer for approval at least 21 Calendar Days before the pre-placement meeting:

Wastewater control and debris management plan. Include details of water supply system, pumping system, and vacuum Equipment.

Plan and Materials to be used to shield traffic from hydrodemolition debris.

Blow-through contingency plan. Provide a written plan for potential Blow-through scenarios. Include Materials used to contain water and debris both above and below the deck.

Type of Equipment that will be used for deck preparation.

Equipment

00505.20 General ‑ Provide Equipment to perform hydrodemolition of the concrete deck surface. Remove all Equipment that leaks oil or other contaminants from the work area until they are repaired.

00505.21 Hydrodemolition Equipment ‑ Hydrodemolition Equipment consists of a water supply system, a high-pressure pumping system, vacuum Equipment, and a robotic hydrodemolition unit.

(a) Water Supply System and Pumping System ‑ Furnish a water supply system and pumping system compatible with the hydrodemolition units and that supplies water that meets the requirements of Section 02020.

(b) Hydrodemolition Unit ‑ Furnish a hydrodemolition unit that is robotic, computerized, and self-propelled, that is capable of removing concrete at a rate and volume as specified and as accepted by the Engineer without leaving a striated surface. Provide either rotating or oscillating nozzles. For Selective Hydrodemolition, provide Equipment capable of operating in the pressure range of 14,000-20,000psi.

(c) Vacuum Equipment ‑ Furnish vacuum Equipment suitable for removal of wastewater and construction debris.

00505.22 Wastewater Recycling Equipment ‑ The Contractor may provide a wastewater recycling unit that removes solid waste from the wastewater such that the water may be reused for hydrodemolition operations.

00505.23 Hand Lances ‑ Furnish hand-operated high-pressure lances that operate at pressures of 10,000 to 40,000psi.

00505.24 Micro-Milling Equipment ‑ Furnish cold plane or rotomill grinding machines using carbide cutting tools on a rotary drum. Provide Equipment with tooth spacing of not more than 1/4 inch, capable of leaving a smooth, uniform pattern of striations. Limit machines to a gross operational weight of no more than 35 Tons and a forward speed to 2.5 feet per minute. Operate at a drum speed of at least 120 RPM.

Construction

00505.40 General ‑ When not in conflict with this Specification, perform hydrodemolition according to ICRI 310.3R.

Prior to hydrodemolition, plug all locations that could allow leakage, including the drains in the deck overhang and box girder bottom flange. Remove plugs after completion of overlay construction.

Plug catch basin at Bent 4 to prevent water infiltration prior to hydrodemolition. Unplug catch basin after completion of overlay construction.

Seal manhole covers to prevent water infiltration prior to hydrodemolition.

00505.41 Partial Depth Concrete Deck Removal ‑ Perform partial depth concrete deck removal on Bridge No. 03139A to the depths shown as follows:

(a) Existing Deck Elevation – Measure and identify existing deck elevations and cross slopes at least every 10 feet, to verify removal depths and to establish final grade. Provide a vertical reference for approval by the Engineer before beginning removal work.

(b) Reinforcement Survey ‑ Using a rebar locator or other approved means, measure and mark the depth of reinforcement at least every 10 feet, in each lane of traffic prior to beginning micro-milling operations.

(c) Existing Repairs ‑ Prior to micro-milling or hydrodemolition operations, remove existing repair patches from the deck using power-driven hand tools. The Contractor may elect to proceed with micro-milling and hydrodemolition operations prior to removing existing repairs if it is demonstrated during hydrodemolition calibration that existing repairs can be removed without increasing the depth of removal at the perimeter of the repairs or causing Blow-throughs.

(d) Micro-milling ‑ Limit micro-milling to the depth shown or within 1/2 inch of reinforcement, whichever is least, measured from the nominal roadway surface. If reinforcement is encountered during milling operations, stop Work immediately and notify the Engineer. Repair any damage to the reinforcement caused by micro-milling operations at no additional cost to the Agency.

(e) Hydrodemolition ‑ Perform Deep Cut Hydrodemolition to a depth of 1 inch on Bridge No. 03139A, Nehalem River, Hwy 102 at MP 40.62 (Birkenfeld). In the presence of the Engineer, calibrate hydrodemolition Equipment on the deck in a location with sound concrete. Measure the removal depth to the mean paste elevation. Mean paste elevation is defined as the average elevation of parent deck concrete paste, excluding exposed aggregate. Record the calibrated settings, including: water pressure gauge, machine staging control, nozzle size and type, nozzle travel speed, and water usage rate. Provide calibrated settings to the Engineer. Do not adjust calibrated settings without notifying the Engineer. Monitor the removal depths to verify the desired depth of sound concrete and all Unsound Concrete is removed. Perform additional calibration in an area with Unsound Concrete if directed by the Engineer.

Hydrodemolition Equipment is operated in the pressure range of 14,000-20,000 psi during Selective Hydrodemolition operations. During Deep Cut Hydrodemolition operations the prescribed depth of removal is achieved with one or more passes of the hydrodemolition unit.

(1) Depth of Removal ‑ Removal depth is measured from the original parent deck surface, or the top of the milled surface, to the mean paste elevation. When performing Selective Hydrodemolition, remove approximately 1/2" of parent deck concrete. When performing Deep Cut Hydrodemolition, remove parent deck concrete to the depth shown or specified, +/- 1/2". The depth of removal is measured from the original parent deck surface accounting for the depth of milling performed. If shown or specified, remove to a depth below the bottom of the top mat of reinforcement.

(2) Deck Blow-Through ‑ If hydrodemolition operations cause a full depth deck Blow-through, immediately stop Work and notify the Engineer. Contain water and debris above and below deck, as necessary. Use equal to or less than 30 pound class chipping hammers to excavate all remaining Unsound Concrete. Square off the repair area and slope the sides to avoid vertical edges. Perform Blow-through repair Work according to 00140.30.

(3) Wastewater and Debris Management ‑ Contain wastewater and debris as outlined in the wastewater control and debris management plan. Provide sufficient shielding during hydrodemolition process to contain dislodged concrete and prevent damage to surrounding property.

(4) Cleaning ‑ Do not allow debris and slurry to dry. Use pressurized water and vacuum Equipment to remove dislodged debris and slurry from the bridge deck. Repeat cleaning until the wastewater is clear. If slurry dries prior to cleaning, use a minimum of 7500 psi water to remove dried slurry. Remove standing water from deck surface prior to surveying the deck for additional removal.

(f) Post Hydrodemolition Survey ‑ In the presence of the Engineer, perform a visual inspection and sounding of the concrete surface. Identify locations of Unsound Concrete for removal. Remove additional Unsound Concrete using 15 pound class power-driven hand tools or hand lances. Identify locations of exposed reinforcement that require removal of concrete surrounding the reinforcing bars. Using a straightedge, stringline, or other approved methods, ensure minimum overlay thickness will be achieved. Remove high areas of concrete with power driven hand tools, hand lances, or additional passes of hydrodemolition Equipment to ensure minimum required overlay thickness. Provide reinforcement chairs or blocks to place reinforcement at required elevation and to prevent deformation of the bars from construction vehicle loading.

(g) Removal of Concrete Surrounding Reinforcing Bars ‑ Remove a minimum of 3/4 inch of concrete around and below reinforcing steel in the following scenarios:

When there is exposed reinforcement that exceeds 24 inches in length, is within the mean paste elevation, and is not bonded to the concrete as identified by hammer sounding.

When power-driven hand tools are used to remove Unsound Concrete that exposes greater than 50 percent of the reinforcing bar.

(h) Reinforcing Bar Repair – Abrasive blast reinforcing steel that is pitted or has flaking corrosion, that would inhibit adequate bonding to the concrete, to a bright finish. Light rust staining may remain in place.

When exposed reinforcement has greater than 50 percent section loss, required repairs will be designated by the Engineer and performed according to 00140.30.

(i) Surface Preparation Accommodations – Clean the entire surface by using abrasive blast or 7500 psi high pressure water blast. Saturate the surface with water for a minimum of 1 hour before resurfacing. Remove standing water with compressed air or wet-dry vacuum ahead of concrete placement. Repeat cleaning and water saturation on areas that are allowed to dry or become contaminated before resurfacing. Immediately after surface preparation is complete cover the prepared deck with clear plastic, overlapping it to prevent contaminants from construction vehicles or other sources from contacting the deck. Maintain the covering until overlay installation.

00505.43 Special Repair Zones – A special repair zone is a specific zone or location on the bridge deck as indicated in the plans. Perform Work in special repair zones as shown according to the following:

(a) Negative Moment Regions ‑ In areas designated as negative moment regions with negative moment reinforcement, do not excavate below the top of the reinforcement. If negative moment reinforcement is exposed, stop Work and re-calibrate the hydrodemolition Equipment in the presence of the Engineer.

Measurement

00505.80 Measurement ‑ The quantities of Work performed under this Section will be measured on the area basis.

Payment

00505.90 Payment ‑ The accepted quantities of Work performed under this Section will be paid for at the Contract unit price, per unit of measurement, for the following items:

Pay Item Unit of Measurement

Payment of item c includes hand tool removal of concrete surrounding reinforcing bars and areas requiring hand tool removal as shown.

Payment of item c includes removal of concrete in negative moment regions. No separate payment will be made for special repair zones.

Removal of Unsound Concrete is included in the hydrodemolition operations and the associated Pay Item including additional removal of Unsound Concrete following the post hydrodemolition survey.

Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment, labor, and Incidentals necessary to complete the Work as specified.

SECTION 00559 - STRUCTURAL CONCRETE OVERLAYS

Comply with Section 00559 of the Standard Specifications modified as follows:

00559.41 Surface Preparation ‑ Replace this subsection, except for the subsection number and title, with the following:

Perform surface preparation according to Section 00505.

00559.43(c)(3) Placing ‑ Add the following sentence to the end of the paragraph that begins “After the deck surface…”

A grout coat is not required on decks prepared with hydrodemolition.

SECTION 00560 - STRUCTURAL STEEL BRIDGES

Comply with Section 00560 of the Standard Specifications modified as follows:

00560.80 Measurement - Add the following to the end of this subsection:

The estimated quantity of structural steel is:

Structure Steel Type Quantity (Pound)

Bridge No. 03139A Structural Steel Maintenance 57

SECTION 00584 - ELASTOMERIC CONCRETE NOSING

Comply with Section 00584 of the Standard Specifications.

SECTION 00620 - COLD PLANE PAVEMENT REMOVAL

Comply with Section 00620 of the Standard Specifications.

SECTION 00744 - ASPHALT CONCRETE PAVEMENT

Comply with Section 00744 of the Standard Specifications modified as follows:

00744.11(a) Asphalt Cement - Add the following to the end of this subsection:

Provide PG 64-22 grade asphalt cement for this Project.

00744.16 Sampling and Testing - Replace this subsection, except for the subsection number and title, with the following:

For each 1,000 Tons of placement, have a CAT I perform a minimum of one of each of the following test methods as modified in the MFTP:

• Asphalt Content - AASHTO T 308 with ODOT TM 323 determined Calibration Factor

• Gradation - AASHTO T 30

• Mix Moisture - AASHTO T 329

• Maximum Specific Gravity - AASHTO T 209

• Field Compacted Gyratory Specimens - ODOT TM 326

When less than 1,000 Tons of mix is placed in a Day, perform a minimum of one series of tests per Day. Provide test results to the Engineer by the middle of the following work shift. The Engineer may waive the requirement for any of AASHTO T 308, AASHTO T 30, AASHTO T 329, and ODOT TM 326 on a daily basis. The Engineer may waive the requirement for AASHTO T 209 when less than 500 Tons of ACP is placed in a single work shift.

Provide samples or split samples to the Engineer when requested.

00744.17 Acceptance - Replace this subsection, except for the subsection number and title, with the following:

If the test result for each mix gradation constituent, asphalt content, and density measurement is within the specification limits, the material will be accepted. If the asphalt content, one or more gradation constituents, or the density measurement are not within the specification limits, the material that is not within the specification limits will be accepted according to 00150.25.

00744.41 Mixing Temperature - Replace the table with the following:

Temperature, °F

00744.49 Compaction - Replace the paragraph that begins "Determine compliance with…" with the following paragraph:

Determine compliance with density Specifications by random testing of the compacted surface with calibrated nuclear gauges. Determine the density by averaging QC tests performed by a CDT with the nuclear gauge operated in the backscatter mode according to AASHTO T 335 at one random location for each 100 Tons of asphalt concrete placed, but take no less than three tests each shift. Do not locate the center of a density test less than 1 foot from the Panel edge. Calculate MAMD according to ODOT TM 305. The Engineer may waive compaction testing requirements when less than 500 Tons of ACP is placed in a single work shift.

SECTION 00860 - LONGITUDINAL PAVEMENT MARKINGS - PAINT

Comply with Section 00860 of the Standard Specifications.