Attachment A Special Provisions~3.docx

Brush Creek Channel Repairs

Attachment A

SPECIAL PROVISIONS

for Brush Creek Channel Repairs

SCOPE

The work to be done under this Contract, on Brush Creek, I-84 (Old Oregon Trail Highway) consists of supplying the materials, equipment, labor, and incidentals required to perform the following tasks as described in the Contract plans and specifications:

· Provide Work Zone Traffic Control

· Construct Temporary Water Management Facility as needed

· Clean channel cells (between weirs)

· Seal cells as directed

· Construct streambed channel

· Perform additional and incidental work as called for by the Contract plans and specifications and as directed

PROJECT INFORMATION

General information pertaining to this project may be obtained from the following:

Wade Holaday, Senior Culvert Maintenance Engineer Oregon Department of Transportation Phone: 503.986.4046 Email: wade.holaday@odot.oregon.gov

APPLICABLE STANDARD SPECIFICATIONS AND SPECIAL PROVISIONS

STATE OF OREGON GENERAL CONDITIONS FOR PUBLIC IMPROVEMENT CONTRACTS: In addition to the solicitation laws and rules, this ITB and the resulting Contract are governed by the STATE OF OREGON GENERAL CONDITIONS FOR PUBLIC IMPROVEMENT CONTRACTS, January 1, 2012, Edition (“General Conditions”) which, although not physically attached, are incorporated herein by reference as an Attachment with the same force and effect as though fully set forth herein. The General Conditions can be obtained from the Department of Administrative Services, 1225 Ferry Street SE U140, Salem, OR 97301-4285, by telephone (503) 378-4642 or online at: GenCon4PI.pdf (oregon.gov)

2024 OREGON STANDARD SPECIFICATIONS FOR CONSTRUCTION: The 2024 Oregon Standard Specifications for Construction (Standard Specifications) include detailed technical specifications in Parts 00200 through 03000 inclusive (Technical Specifications) that apply to this ITB and the resulting Contract. Some sections of the Technical Specifications are identified and modified herein, Attachment B – Special Provisions. Sections of the Technical Specifications not modified remain applicable to the Contract according to their original terms. Unless they are identified herein, sections of the Standard Specifications in Part 00100 (General Conditions) are not applicable to this Contract. Bidders can also access this information at the following Internet address: 24 Special Provisions (oregon.gov)

Silence of Specifications: The apparent silence of the specifications as to any detail, or the apparent omission of a detailed description concerning any point, shall be regarded as meaning that the highest value commercial practices are to prevail and that only materials and workmanship of first quality are to be used.

PROFESSIONAL OF RECORD CERTIFICATION

The following special provisions were prepared and/or reviewed by the Engineer whose professional seal appears below. These specifications are not valid unless the appropriate signed seal appears below and shall not be modified without the approval of the Engineer.

Oregon Department of Transportation Special Provisions For

PROFESSIONAL OF RECORD CERTIFICATION(s):

Seal w/signature

I certify the Special Provision Section(s) listed below are applicable to the design for the subject project. Modified Special Provisions were prepared by me or under my supervision.

SECTION: 00220, 00221, 00222, 00223, 00224, 00226

Signed: 1/21/2025

PROFESSIONAL OF RECORD CERTIFICATION

The following special provisions were prepared and/or reviewed by the Engineer whose professional seal appears below. These specifications are not valid unless the appropriate signed seal appears below and shall not be modified without the approval of the Engineer.

Oregon Department of Transportation Special Provisions For

PROFESSIONAL OF RECORD CERTIFICATION(s):

Seal w/signature

I certify the Special Provision Section(s) listed below are applicable to the design for the subject project. Modified Special Provisions were prepared by me or under my supervision.

SECTION: 00245, 00290, 00396, 01091

Signed: 1/16/2025

000210 - MOBILIZATION

Comply with Section 000210.00 of the Standard Specifications.

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 Old Oregon Trail Highway I-84 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 Westbound on the Old Oregon Trail Highway I-84 may be closed during the following times:

Anytime from the start of work for a maximum of 30 calendar days.

· Maintain at least 22 feet clear lane width at all times.

SECTION 00221 - COMMON PROVISIONS FOR WORK ZONE TRAFFIC CONTROL

Comply with Section 00221 of the Standard Specifications modified as follows:

00221.06 Traffic Control Plan ‑ Replace this subsection with the following subsection:

00221.06 Traffic Control Plan and Tourist-Oriented Directional and Business Logo Signs –

(a) Traffic Control Plan - Submit one of the following, 5 Calendar Days before the preconstruction conference:

(1) Agency Traffic Control Plan ‑ If the Contractor intends to use the Agency TCP without modification, a written notification indicating that the Agency TCP will be used without modification.

(2) Contractor-Modified Traffic Control Plan ‑ The Contractor may request to use a Contractor-modified Agency TCP, or a TCP developed by the Contractor. Do not use a modified TCP, or a TCP developed by the Contractor, unless approved by the Engineer. Use the Agency TCP unless a modified TCP, or a TCP developed by the Contractor is accepted.

The Engineer is not obligated to consider any modified Agency TCP or a TCP developed by the Contractor. The Agency will not be liable to the Contractor for failure to accept or act upon any request for a modified Agency TCP or a TCP developed by the Contractor.

To conserve time and funds, the Contractor may first submit a written request for a preliminary review by the Engineer. The request should contain a description of the proposal together with a rough estimate of anticipated dollar and time impacts. The Engineer will, within a reasonable time, respond to the Contractor in writing whether or not the request would be considered by the Agency.

If requesting a Contractor-modified Agency TCP, or a TCP developed by the Contractor, at a minimum the request shall meet all requirements of the Contract documents and comply with the Project transportation management plan (TMP). Provide the following information:

Stamped Working Drawings according to 00150.35 that include the proposed TCP showing all TCM and quantities of TCD.

A TPAR plan that includes:

Details and features used to provide pedestrian accessibility.

Pedestrian staging Plans at a scale no smaller than 1 inch = 50 feet.

Temporary alternate facilities or detour routes for pedestrian traffic.

Staging sequences and details for Work affecting vehicular, pedestrian, and bicycle traffic.

Proposed order and duration of the TCM.

A detailed temporary striping plan.

If the Contractor’s request to use a Contractor-modified Agency TCP, or a TCP developed by the Contractor is approved in whole or in part, acceptance will be made by a Change Order.

The Engineer will establish prices that represent a fair measure of the value of Work to be added, changed, or deleted as a result of any accepted modifications to the Agency TCP or an accepted TCP developed by the Contractor.

Once a TCP has been accepted by the Engineer, any additional modifications must be submitted by the Contractor for Agency review following the procedure described above. The Engineer is not obligated to consider additional modifications to a previously approved TCP.

(b) Tourist-Oriented Directional and Business Logo Signs ‑ Submit one of the following for approval, at least 5 Calendar Days before the preconstruction conference:

(1) No Signs ‑ If there are no tourist-oriented directional (TOD) or business logo signs on the Project, a written notification that no TOD or business logo signs exist within the Project limits or

(2) Signs ‑ Submit one copy of a sketch map of the Project showing all existing TOD and business logo signs and a written narrative describing how these signs will be kept in service and protected throughout all the construction stages. If modifications are necessary, submit updated information to the Engineer for approval at least 21 Calendar Days before the change is needed.

00221.90(b) Temporary Protection and Direction of Traffic – Replace the bullet that begins “Providing, Surfacing, maintain…” with the following bullet:

· Providing, surfacing, maintaining, removing, and restoring the TPAR.

SECTION 00222 – TEMPORARY TRAFFIC CONTROL SIGNS

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

00222.40(e) Temporary Sign Placement ‑ Add the following to the end of the bullet list:

· Install "ROAD WORK AHEAD" (W20‑1‑48) signs with a 36 by 24-inch "FINES DOUBLE" (R2‑6aP) rider on the Old Oregon Trail Highway, according to the "TCD Spacing Table" shown on the Standard Drawings or as modified by the Plans except do not install the "FINES DOUBLE" rider on concrete barrier mounted signs.

· Install beyond each end of the Project, facing outgoing traffic, an "END ROAD WORK" (CG20‑2A‑24) sign a distance of (A ÷ 2) according to the "TCD Spacing Table" shown on the Standard Drawings or as modified by the Plans.

· Install a 72 by 24-inch "CONSTRUCTION VEHICLE DO NOT FOLLOW" (CW23‑14) sign on rigid substrate on the back of all Material or Equipment delivery vehicles.

Add the following subsection:

00222.40(f) Temporary Speed Zone Reduction - Install a temporary regulatory speed zone, as directed. Use regulatory signs for all required temporary speed zone signage.

00222.45(c) Radar Speed Trailers - Add the following bullet(s) to the end of the bullet list:

· Place a radar speed trailer approximately 1000 feet beyond the end of the lane closure taper, as shown on Standard Drawing TM880

· Install a 30 by 36-inch “SPEED LIMIT XX” (R2‑1) sign below the trailer display panel. The “XX” value is the legal speed limit as determined by a Speed Zone Order signed by the State Traffic Engineer.

00222.80(a) Area Basis -

Add the following sentence to the end of the paragraph that begins "Temporary signs will…":

No measurement of quantities will be made for “CONSTRUCTION VEHICLE DO NOT FOLLOW” (CW23-14) signs.

Add the following sentence to the end of this subsection:

Temporary signing quantities include temporary regulatory speed zone signage.

00222.80(b) Unit Basis - Add the following sentence to the end of this subsection:

PCMS installed on finish rollers or intermediate rollers will be measured on the unit basis.

00222.90 Payment -

Add the following to the end of this subsection:

Payment will be made for not more than 1 set of Work Area signs. All additional sets of Work Area signs will be at no additional cost to the Agency.

No separate or additional payment will be made for furnishing, installing, and maintaining 72 by 24-inch "CONSTRUCTION VEHICLE DO NOT FOLLOW" (CW23‑14) signs. Payment will be included in 00221.90(b).

SECTION 00223 - WORK ZONE TRAFFIC CONTROL LABOR AND VEHICLES

Comply with Section 00223 of the Standard Specifications.

SECTION 00224 - TEMPORARY TRAFFIC CHANNELIZING DEVICES

Comply with Section 00224 of the Standard Specifications.

SECTION 00226 - TEMPORARY ROADSIDE BARRIERS AND IMPACT ATTENUATORS

Comply with Section 00226 of the Standard Specifications modified as follows:

00226.80(b)(2) Temporary Barrier ‑ Add the following to the end this subsection:

The quantities will be limited to those shown in Table 00226-1. The estimated quantity of Temporary Barrier is:

TABLE 00226-1

(M.P. to M.P.)

Temporary Barrier (foot) Temporary Barrier, Minimum Deflection (foot)

00226.90 Payment - Add the following paragraphs after the paragraph that begins "In items (g) and (h)…":

Payment for items (g) performed beyond the quantity shown in the Contract Schedule of Items will be made at the Contract unit price if the Engineer determines that the Contract unit price does not exceed the value of the Work as determined according to Section 00197. If the Engineer determines that the Contract unit price exceeds the value of the Work, payment for the Additional Work will be made according to 00195.20.

SECTION 00245 ‐ TEMPORARY WATER MANAGEMENT

Section 00245, which is not a Standard Specification, is included in this Project by Special Provision.

Description

00245.00 Scope ‐ This work consists of furnishing, installing, operating, maintaining, and removing temporary water management facilities in regulated work areas.

Definitions:

Temporary Water Management Facility ‐ A facility that conveys water around work areas, removes water from work areas, and treats and discharges water at locations outside work areas.

Temporary Water Management Plan (TWMP) ‐ 28 Calendar Days before beginning work in regulated work areas, submit stamped working drawings of a Contractor‐developed TWMP, according to 00150.35, that meets water quality and environmental guideline requirements and does not affect neighboring properties or water rights.

Include at least the following information:

· The sequence and schedule for dewatering and re‐watering.

· How the work area will be isolated from the active stream flow upstream, through, and downstream.

· If the system has no flow, “in the dry”, state this in the sequence and schedule.

· How the stream flow will be routed and conveyed around or through the isolated work area.

· How the isolated area will be de‐watered.

· How the pumped water will be treated before it is discharged downstream.

· Discuss all construction stages.

· A list of on‐site backup materials and equipment.

· Calculations of water withdraw pumps capacity.

If the system is “in the dry”, include a list of materials that will be available in the event of storm runoff through the work area.

Obtain the Engineer's written approval before beginning work in in‐water work areas.

Materials

Materials ‐ Furnish materials meeting the following requirements:

Furnish pumps that are:

· Self-priming.

· Equipped with a variable speed governor.

· Equipped with a power source.

· Able to pump water that contains soft and hard solid.

Construction

Fish Removal ‐ The Agency, ODFW biologists, or ODOT consultant personnel will remove fish and aquatic life from the isolation work areas if water is present. Allow them access into the isolation work areas before and after installation of the temporary water management facilities as follows:

· Before Installation of Facilities ‐ Before installing temporary water management facilities they will remove fish and aquatic life within the proposed isolated work area.

· After Installation of Facilities ‐ After installing temporary water management facilities, begin reducing the water level through the isolated work area. They will remove all fish and aquatic life as the water level is reduced. Do not de‐water the isolation area until all fish and aquatic life have been removed.

Installation ‐ During installation of the temporary water management facility, maintain a downstream water flow rate of at least 50 percent of the upstream water flow rate.

Operation ‐ If water is present, operate temporary water management as follows:

· Protect fish and fish habitat according to 00290.34.

· Maintain and control water flow downstream of the isolated work area for the duration of the diversion to prevent downstream de‐watering.

· Clean and repair water intake screening to maintain adequate flow and protection of aquatic life.

Maintenance ‐ Monitor water turbidity according to 00290.30(a)(8).

Removal ‐ Remove the temporary water management facility and re-water and restore the stream flow when approved by the Engineer. Maintain downstream water flow during removal of the facility.

Measurement

00245.80 Measurement ‐ No measurement of quantities will be made for temporary water management facilities.

The estimated quantities of materials required for the temporary water management facility are:

Temporary Water Management Facility:

Turbidity monitoring will be measured according to 00290.80.

Payment

Payment ‐ The accepted quantities of temporary water management facilities will be paid for at the Contract lump sum amount for the item "Temporary Water Management”.

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.

Turbidity monitoring will be paid according to 00290.90.

No separate or additional payment will be made for designing, maintaining, operating, moving, and removing the facility.

SECTION 00280 – EROSION AND SEDIMENT CONTROL

Comply with section 00280 of the Standard Specifications.

SECTION 00290 - ENVIRONMENTAL PROTECTION

00290.30(a) Pollution Control Measures - Add the following subsections and bullets:

(7) Water Quality:

Do not discharge contaminated or sediment-laden water, including drilling fluids and waste, or water contained within a work area isolation, directly into any waters of the State or U.S. until it has been satisfactorily treated (for example: bioswale, filter, settlement pond, pumping to vegetated upland location, bio-bags, dirt‑bags). Treatment shall meet the turbidity requirements below.

· Do not cause turbidity in waters of the State or U.S. greater than 10% above background reading (up to 100 feet upstream of the Project), as measured 100 feet downstream of the Project.

· During construction, monitor in-stream turbidity and inspect all erosion controls daily during the rainy season and weekly during the dry season, or more often as necessary, to ensure the erosion controls are working adequately meeting treatment requirements.

· 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.

· If monitoring or inspection shows that the erosion and sediment controls are ineffective, mobilize work crews immediately to make repairs, install replacements, or install additional controls as necessary.

· Implement containment measures adequate to prevent pollutants or construction and demolition materials, such as waste spoils, fuel or petroleum products, concrete cured less than 24 hours, concrete cure water, silt, welding slag and grindings, concrete saw cutting by-products and sandblasting abrasives, from entering waters of the state or U.S.

· End-dumping of riprap within the waters of the state or U.S. is not allowed. Place riprap from above the bank line.

· Cease project operations under high flow conditions that may result in inundation of the project area, except for efforts to avoid or minimize resource damage.

· The Project Manager retains the authority to temporarily halt or modify the Project in case of excessive turbidity or damage to natural resources.

(8) Meter Turbidity Monitoring - Perform meter turbidity monitoring each day when working in regulated work areas according to the following:

· Use a turbidity meter that has been calibrated to meet manufacturer requirements.

· Before beginning work, take in stream turbidity readings approximately 100 feet upstream and approximately 100 feet downstream of the in‑water work area.

· Take in stream turbidity readings upstream and downstream at two-hour intervals or more frequently and perform in-water work based on turbidity measurements according to the following:

· If the downstream reading at the compliance distance is 0 to 4 nephelometric turbidity units (NTU) above upstream levels, continue to work and take readings every two hours.

· If the downstream reading at the compliance distance is 5 to 29 NTU above upstream levels, modify work procedures and best management practices (BMPs) and continue monitoring. If after four hours, the downstream reading is still 5 to 29 NTU above upstream levels, stop all in‑water work and implement additional BMPs. Resume in‑water work activities after the downstream reading returns to 0-5 NTU above upstream levels.

· If the downstream reading at the compliance distance is 30 to 49 NTU above upstream levels, modify work procedures and BMPs and continue monitoring. If, at the subsequent two-hour reading, the downstream reading is still 30 to 49 NTU above upstream levels, stop all in‑water work and implement additional BMPs. Resume in‑water work activities after the downstream reading returns to 0-5 NTU above upstream levels.

· If the downstream reading at the compliance distance is 50 NTU or more above upstream levels, stop all in‑water work and implement additional BMPs. Contact the Project Manager. Resume work when instructed by the Project Manager.

Document all turbidity monitoring results including date, time, and location on the Agency provided form or another form approved by the Agency. Submit reports to the Engineer weekly when working in regulated work areas and keep copies of the reports at the project site.

If work activities violate permit conditions or cause water quality violations which may endanger the health of aquatic life or environment, stop all in‑water work activities and notify the Engineer. Submit a written report of violations to the Engineer within 5 Calendar Days of violation.

Document all turbidity monitoring results including date, time, and location on the Agency provided form or another form approved by the Agency. Submit reports to the Engineer weekly when working in regulated work areas and keep copies of the reports at the project site.

If work activities violate permit conditions or cause water quality violations which may endanger the health of aquatic life or environment, stop all in‑water work activities, and notify the Engineer. Submit a written report of violations to the Engineer within 5 Calendar Days of violation.

00290.34 Protection of Fish and Fish Habitat - Add the following paragraph:

Meet with the Agency Biologist, Resource Representative, Project Manager, and inspector on site, before moving equipment on-site or beginning any work, to ensure that all parties understand the locations of sensitive biological sites and the measures that are required to be taken to protect them.

00290.34(a) Regulated Work Areas - Add the following to the end of this subsection:

For this Project, the regulated work area is defined as the area at or below the ordinary high water (OHW) elevation. The Engineer will identify and mark the regulated work area.

Perform work within the regulated work area only during the in-water work period. The in‑water work period is from July 1 to October 15.

Submit a schedule to complete all work within the regulated work area within the in-water work period at least 10 days prior to the preconstruction conference.

Add the following subsection:

00290.34(c) Aquatic Species Protection Measures Required by Environmental Permits:

(1) General Requirements:

Use heavy equipment as follows:

· Secure absorbent material around all stationary power equipment (for example: generators, cranes, drilling equipment) operated within 150 feet of wetlands, waters of the State, waters of the U.S., drainage ditches, or water quality facilities to prevent leaks, unless suitable containment is provided to prevent spills from entering waters of the state or waters of the U.S.

· Do not cross directly through a stream for construction access, unless shown or approved. If shown or approved, cross perpendicular to the stream and do not block stream flow. When a crossing is no longer needed, completely remove the crossing, and restore the soils and vegetation to the original condition.

· Store fuel and maintain all equipment in staging areas that are at least 150 feet away from any waters of the State, waters of the U.S., or storm inlet or on an impervious surface that is isolated from any waters of the State, waters of the U.S., or storm inlet.

· If temporary access roads are needed within 150 feet of any body of water, use existing routes unless new routes are shown or approved.

· Before beginning work on temporary access routes that are not shown, submit a proposal to the Engineer for approval.

(2) Work Area Isolation - Provide work isolation according to Section 00245. Provide safe passage around or through the isolated work area for adult and juvenile migratory fish unless passage did not previously exist.

(3) Water Intake Screening - Install, operate, and maintain fish screens on each water intake used for project construction, including pumps used to isolate an in-water work area. When drawing or pumping water from any stream, protect fish by equipping intakes with screens having a minimum 27% open area and meeting the following requirements:

Perforated plate openings shall be 3/32 inch or smaller.

· Mesh or woven wire screen openings shall be 3/32 inch or smaller in the narrowest direction.

· Profile bar screen or wedge wire openings shall be 1/16 inch or smaller in the narrow direction.

Choose size and position of screens to meet the following criteria:

(Ft./Sec.)

Sweeping Velocity 2 (Ft./Sec.)

Wetted Area of Screen (Sq. Ft.)

Comments

0.4 fps If screen is longer than 4 feet, angle 45° or less to stream flow

0.4 fps

0.2 fps Pump rate 1 cfs or less

1 Velocity perpendicular to screen face at a distance of approximately 3 inches 2 Velocity parallel to screen

Provide ditch screens with a bypass system to transport fish safely and rapidly back to the stream.

(5) Site Restoration - Restore damaged streambanks to a natural slope, pattern, and profile suitable for establishment of permanent woody vegetation unless precluded by pre‑project conditions (for example: natural rock substrate):

· Stabilize all disturbed soils, including obliteration of temporary access roads, following any break in work unless construction will resume in 4 Calendar Days.

(9) Treated Wood - Treated wood includes any wood treated with any pesticide or wood preservatives. Do not use lumber, pilings, or other wood products that are treated or preserved with pesticidal compounds below the OHW or as part of an in-water or over-water structure, except as described below:

Store treated wood shipped to the Project out of contact with standing water and wet soil and protected from precipitation.

· Visually inspect each load and piece of treated wood. Reject for use in or above aquatic environments if visible residues, bleeding of preservative, preservative-saturated sawdust, contaminated soil, or other matter is present.

· Use pre-fabrication to the extent feasible. When field fabrication is necessary, all cutting and drilling of treated wood, and field preservative treatment of wood exposed by cutting and drilling, shall occur above the OHW. Use tarps, plastic tubs, or similar devices to contain the bulk of any fabrication debris and wipe off any excess field preservative.

· All treated wood structures, including pilings, shall have design features to avoid or minimize impacts and abrasion by livestock, pedestrians, vehicles, vessels, and floats.

· Treated wood may be used to construct a bridge, over-water structure or an in-water structure, except for the work containment system, provided that all surfaces exposed to leaching by precipitation, overtopping waves, or submersion are coated with a water-proof seal or barrier are maintained. Apply and contain coatings and paint-on field treatment to prevent contamination. Surfaces that are not exposed to precipitation or wave attack, such as parts of a timber bridge completely covered by the bridge deck, are exempt from this requirement.

· During demolition of treated wood, ensure that no treated wood debris falls into the water. If treated wood debris does fall into the water, remove it immediately.

· Store removed treated wood debris in appropriate dry storage areas, at least 150 feet away from the regulated work area.

(14) Injured Fish Notification - If a dead or injured fish is found in the project area, immediately notify the Agency. If the injured fish is in a location where further injury or stress may take place, attempt to move the fish to a safer location, if one is available, near the capture site while keeping the fish in the water and reducing its stress as much as possible. Do not disturb the fish after it has been moved. If the fish is dead or dies while being captured or moved, save the fish and any tags. The Agency will notify appropriate regulatory agencies about the injured or dead fish and provide additional direction to the Contractor.

00290.90 Payment - Add the following paragraph(s) to the end of this subsection:

The accepted quantities of turbidity monitoring will be paid for at the Contract lump sum amount for the item "Turbidity Monitoring".

Payment for turbidity monitoring 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 00390 – RIPRAP PROTECTION

Comply with section 00390 of the Standard Specifications.

SECTION 00396 - SHOTCRETE SLOPE STABILIZATION

Comply with Section 00396 of the Standard Specifications modified as follows:

00396.30 Personnel Qualifications – Remove the following paragraph:

“All Nozzle Operators shall have current certification by the American Concrete Institute for wet-mix or dry-mix vertical placement of shotcrete, as appropriate to the proposed mixing process.”

SECTION 01091 - WATERWAY ENHANCEMENTS

Section 01091, which is not a Standard Specification, is included in this Project by Special Provision.

Description

01091.00 Scope - This Work consists of constructing waterway enhancements such as fish Rocks, engineered streambed Material, and other types of waterway items as shown or directed.

01091.05 Pre-Work Meeting ‑ Attend a pre-work meeting at the Project Site with the Engineer, at a mutually agreed upon time, at least 8 Calendar Days prior to implementation of any waterway enhancement work. Required attendees include:

· Engineer

· Contractor

· Waterway Enhancement Subcontractors

· ODOT Region Environmental Coordinator

· ODOT Hydraulics Designer

The pre-work meeting agenda typically includes the methods of accomplishing all phases of the waterway enhancement work, including:

· temporary water management (TWM)

· fish salvage plan and strategy

· environmental risks discussion

· turbidity monitoring

· energy dissipation

· dewatering strategy

· existing streambed Material salvage

· site clean-up expectations

· circumstances under which contacting the Engineer is required

Representatives from interested permitting agencies will be invited by the Agency.

Materials

01091.10 Material - Furnish Materials meeting the following requirements:

Streambed Gravels are classified as follows:

· Salvaged streambed Material

Provide streambed gravels with the associated ratios:

Engineered Streambed Material:

Salvaged streambed Material 100% by volume

Components of the salvaged streambed Material which meet the criteria for the specific Material may be used as streambed gravels based upon visual acceptance by the Engineer.

(a) Loose Riprap ‑ Provide loose riprap meeting the requirements of Section 00390.

(b) Fish Rocks:

· Type 2 - Greater than 900 pounds to 1,800 pounds size, salvage fish rocks from existing project site as directed.

Type 2 fish Rocks as shown and placed as directed.

PVC Geomembrane Liner: Furnish PVC Geomembrane meeting the following requirements.

· Free of defects, cuts or tears.

Table 01091-1 PVC Geomembrane Property Values

0.25+/-.013 mm

Tensile Properties

· Strength at break

· Elongation

· Modulus at 100% D-882 Min

(MD & TD)

73 lbs/in (8.4 kN/m) 380% 32 lbs.in (5.6 kN/m)

Min 8 lbs (35 N)

Max Chg

(MD & TD)

3%

Pass -20 F -29 C

Construction

01091.40 General - Obtain all permits and perform Work in and around water according to Section 00290, Section 00245 and the following:

(a) Streambed Excavation ‑ Excavate the foundation for streambed Materials to the elevations and grades as shown. As directed by the Engineer, excavate scour holes in the approximate locations as shown.

(b) Salvaged Streambed Materials ‑ During streambed excavation, salvage and stockpile the existing streambed Materials as directed for re-use.

(c) PVC Geomembrane – Install geomembrane as per manufacturers requirements and as directed.

(d) Loose Riprap ‑ Place loose riprap Material within the stream channel as shown or as directed.

(e) Engineered Streambed Material ‑ Place engineered streambed Material in the stream channel as shown or directed. Place the streambed Material in lifts no thicker than 12 inches. Provide streambed Material in its final location with a well graded mix of streambed sediments and streambed Cobbles.

Construct streambed Material to ensure that low stream flows are conveyed above the finished channel. Pressure apply water to each placed layer to facilitate filling the interstitial voids of the streambed Materials with streambed Sand. The voids are satisfactorily filled when water equivalent to the flow rate of the stream does not go subsurface and there is visual acceptance by the Engineer. If water is not present in the stream, apply water to the stream channel for visual acceptance by the Engineer.

(f) Fish Rocks - Place Rocks as shown or as directed.

01091.80 Measurement - Work performed under this Section will be measured according to the following:

(a) Fish Rocks - The quantities of fish Rocks will be measured on the unit basis.

(b) Streambed Excavation and Streambed Materials - The quantities of streambed excavation, salvaged streambed Materials and engineered streambed Materials will be measured on the volume basis.

Payment

01091.90 Payment - The accepted quantities of waterway enhancement items will be paid for at the Contract unit price, per unit of measurement, for the following items:

Pay Item Unit of Measurement

In item (e), the type of fish Rocks will be inserted in the blank.

Loose riprap will be paid for according to 00390.90.

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