Attachment A - Specifications~6.pdf

Revision: 08/21/2025 Page 1 of 9

ATTACHMENT A

TECHNICAL SPECIFICATIONS

SCOPE OF WORK

The scope of this project is to provide geotechnical investigation services, including all equipment, labor, machinery, supplies, and materials to drill up to eleven geotechnical borings for the I-84: Moffett Creek Bridge replacement project in Cascade Locks, Oregon. Region 1 Geotechnical Engineering / Engineering Geology (R1 Geo) has prepared these specifications and anticipates hollow stem auger, mud rotary, and rock coring techniques. This work shall include, but not be limited to, mobilization/demobilization to/from the site and within the project area, drilling operations, sampling, supply and containment of water for drilling operations, containment and disposal of drill cuttings and fluids, site clean-up, etc.

STATEMENT OF WORK

Project Manager/Geologist:

Primary Contact Jeff Jones, C.E.G.

Engineering Geologist ODOT Region 1 Geo/Hydro/Hazmat Unit 123 NW Flanders St.

Portland, OR 97209 Telephone: (503) 302-6460

Secondary Contact Palo Giscombe, P.E.

Geotechnical Engineer ODOT Region 1 Geo/Hydro/Hazmat Unit 123 NW Flanders St.

Portland, OR 97209 Telephone: (503) 807-5541

Project Location: The project is located on I-84 westbound (WB), between mile points (MP’s) 38.86 and 39.08, west of Cascade Locks, Oregon. Geotechnical investigations for this project will be located adjacent to I-84 WB, on the Historic Columbia River Highway State Trail (HCRHST) in the vicinity of the existing westbound bridge, and along the HCRHST adjacent to eastbound I-84.

Diagrams/Drawings/etc.: Attached are the following:

Vicinity Map and Site Plan (5 pages) TM861 – Oregon Standard Drawing for Divided Highway or Freeway Shoulder & Lane Closures

Project Dates and Schedule: Work shall begin after the Notice to Proceed is issued, and R1 Geo intends to complete the work described herein during the autumn of 2025. In any case, the work shall be completed no later than November 30, 2025. The start date will be the date the Contractor mobilizes equipment and personnel to the work site.

Several components of the work will require night work shifts (7 p.m. to 7 a.m. ). See “Access and Staging” below for more details.

The contractor shall accept the proposed schedule, in writing, or provide a written alternative proposal to the Project Manager within five (5) business days after receipt of the Notice to Proceed. The Project Manager will either approve the proposed schedule or propose an alternate schedule to the contractor within two (2) business days after receipt of the contractor’s submittal.

Revision: 08/21/2025 Page 2 of 9

Access and Staging:

As shown on the attached Site Plan, a total of eleven borings are planned. Details regarding access and staging for the borings follow.

Four of the borings (TB23065-01, -02, -05, & -06) will be located in unpaved areas behind the guardrail immediately adjacent to the existing highway and bridge. Clearing of brush and minor grading, to include up to about 2 feet of temporary fill (onsite borrow material), will be needed to access these locations.

Guardrail will need to be temporarily removed to provide access to borings TB23065-01 and -05, as indicated on the Site Plan. Mobilization and demobilization for these two borings will require a shoulder and lane closure and will need to occur between the hours of 7 p.m. and 7 a.m. the following morning, Sunday evening through Friday morning. Guardrail shall be re-installed at the end of each shift prior to departing the site. Any guardrail posts removed during the work shall be replaced with new posts.

Three of the borings (TB23065-07, -08, & -09) will be located on the paved shoulder of I-84 WB and will require a shoulder and lane closure. These borings will need to be completed during night work shifts, occurring between the hours of 7 p.m. and 7 a.m. the following morning, Sunday evening through Friday morning.

Two of the borings (TB23065-03 & -04) will be located on the paved Historic Columbia River Highway State Trail, which passes beneath the existing WB bridge near its west abutment. The borings will be located on either side of the existing WB bridge (i.e. drilling beneath the bridge is not required). A small footprint and low overhead clearance rig will be needed to work on the trail and to pass beneath the existing WB bridge (12 to 13 feet wide with 11.5’ overhead clearance).

Two of the borings (TB23065-10 & -11) will be located on the paved Historic Columbia River Highway State Trail adjacent to (south of) the existing EB highway. Access will require maneuvering the drill rig and support vehicle potentially up to about 4,000 feet along the trail, which is generally 12 to 13 feet wide.

A small footprint drill rig is recommended for these locations.

Utility Search: The contractor is responsible for utility locates. ODOT will request an independent public utility locate and provide “ticket” number(s) and details to the contractor.

Temporary Protection and Direction of Traffic (TP-DT): Three of the borings (TB23065-07, -08, & -

09) will be located on the paved shoulder of I-84 WB and will require a shoulder and lane closure. These borings will need to be completed during shifts occurring between the hours of 7 p.m. and 7 a.m., Sunday evening through Friday morning.

Guardrail will need to be temporarily removed to provide access to borings TB23065-01 and -05, as indicated on the Site Plan. Mobilization and demobilization will require a shoulder and lane closure. Lane closures are allowed to occur between the hours of 7 p.m. and 7 a.m., Sunday evening through Friday morning. Guardrail shall be re-installed at the end of each shift prior to departing the site.

A Truck Mounted Attenuator (i.e. “crash truck”) shall be included in traffic control plans for shoulder and lane closures. For single lane closures, the contractor shall provide all TP-DT devices and personnel in accordance with the attached ODOT Standard Drawing TM861 (Highway/Freeway One-Lane Closures) with a Portable Changeable Message Sign (PCMS) in advance of the ROAD WORK AHEAD signs. In all cases, the Contractor shall operate in conformance with the 2009 edition of the Manual of Uniform Traffic Control Devices (MUTCD), Part VI and the Oregon Temporary Traffic Control Handbook (2011).

The contractor shall submit a traffic control plan to the Project Manager/Project Geologist for review at least 5 business days prior to beginning work. The contractor will be responsible for correcting any inconsistencies identified in the plan. A revised plan will then need to be submitted to the primary / secondary contact for review within 48 hours.

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Illumination: Contractor shall provide light plant(s) or other light source(s) of sufficient strength to illuminate the work area for safety and provide enough light for the examination and description of samples.

Safety: Safety is of primary concern on this project, for the traveling public, Contractor's crew, and State employees. In the event the Project Manager/Project Geologist or designated representative feels there are concerns regarding safety issues, the project may be halted until such time those issues are resolved to the satisfaction of the State. The Contractor shall take every precaution necessary to ensure the safety of all parties and the protection of all property associated with this project. All contractor employees shall wear an orange, red, or yellow safety vest or other garment that meets ANSI 107-1599, Class III.

Emergency Shutdowns: In the event that traffic, inclement weather, or other highway related emergencies require suspension of drilling operations, the primary/secondary contact may authorize standby for the time that operations are suspended or the remainder of the shift, whichever is less. The maximum amount of standby authorized for an emergency shutdown shall not exceed the hours defined in the Bid Item Descriptions. Payment shall be calculated as defined in the section Bid Item Descriptions.

Drilling Equipment: Contractor shall supply a drill rig capable of advancing hollow stem auger, mud rotary, and rock coring techniques to the depths shown in Table 1. Contractor shall supply mud rotary tools with a minimum nominal diameter of 4 inches. The drill shall be equipped with a 140-pound “Auto-Hammer”-type hammer system. The Contractor shall provide current hammer calibration data to the primary / secondary contact prior to beginning work. Rock coring equipment should be type HQ. R1 Geo has supplied anticipated sampling intervals, which are highly dependent on the materials encountered.

Drill Fluids: Contractor shall provide all necessary drilling fluids. The contractor shall prevent drill fluids and cuttings from directly entering any waterway, storm drain or sewer at any time during drilling operations.

Discharge of drill fluids or cuttings directly into State waters in any form is strictly forbidden. Upon completion of the boring, the contractor shall collect, transport and dispose of used drill fluids. Time, labor, and equipment necessary to supply and dispose of the drill fluids shall be considered incidental to drilling.

If drilling in unpaved areas, drill fluids shall be handled in accordance with the Environmental Protection section below.

Drilling additives approved for use in water well drilling are preferred. In all cases when using drill additives, use those additives that are nontoxic and proven safe to the environment. The Contractor shall have on site Safety Data Sheets (SDS) for all drilling fluid additives.

Investigation Derived Waste (IDW): The contractor shall collect and dispose of drill cuttings/fluids.

Placement of drill cuttings or fluids on ODOT right-of-way shall not be permitted. Except for contaminated cuttings/fluids described below, collection, handling, and disposal is considered incidental to drilling.

Collection and disposal of single-use PPE (gloves, earplugs, etc.) shall be the responsibility of the Contractor.

If contaminated cuttings are encountered, they shall be segregated from uncontaminated cuttings whenever possible. If contaminated cuttings are encountered, drilling may temporarily stop while the Project Manager/Project Geologist evaluates the contamination and may not proceed without approval from the Project Manager/Project Geologist. The Project Manager/Project Geologist or designee shall determine when contaminated cuttings are present and shall direct the contractor when to place the cuttings in contractor-supplied drums. Each drum shall be labeled with the boring number, drilled interval, and date. The contractor shall transport the filled drums to a designated storage area, placing the drums as directed by the Project Manager/Project Geologist.

Environmental Protection: The contractor shall implement the following Best Management Practices for Drilling Operations (Drilling BMPs) when operating near aquatic resources. Contractor shall supply, install and maintain all necessary erosion and sediment control devices (e.g., silt fence, bio-bags, booms, inlet

Revision: 08/21/2025 Page 4 of 9 socks, etc.) as directed by the Project Manager/Project Geologist. The contractor shall remove the devices only as directed by the Project Manager/Project Geologist. Contractor shall have sufficient quantities of silt fence and bio-bags or booms immediately available to control the spread of cuttings/drill fluids. Erosion and sediment control shall be considered incidental to drilling.

The following Drilling BMPs shall be implemented:

• Access shall be as directed by the Project Manager/Project Geologist or their designee.

• The Contractor shall take all reasonable precautions to prevent fuel, lubricant, and/or hydraulic fluid leaks from all equipment on site and to prevent those materials from entering any streams or watercourses. Each drill shall be equipped with a spill clean-up kit. The contractor shall be prepared to immediately clean up spills or leaks of up to 10 gallons and to contain larger spills. If a spill occurs, the ODOT Hazardous Materials Unit shall immediately be notified. The ODOT Hazardous Materials Unit will provide guidance and oversight of the clean-up operation. The Contractor shall be responsible for all clean-up and associated costs.

• The Contractor shall contain or control any drill fluids or cuttings that have the potential to enter any stream or wetland. This may entail the use of fluid recirculation, bio-bags, swale filtration, silt fencing, or other approved sediment control devices/methods. Drill fluids and cuttings shall not directly enter any aquatic resource. No increase in ambient turbidity shall be allowed. If an increase in turbidity is noted, drilling operations shall be suspended until the source of the turbidity is determined and appropriate corrective actions are taken.

• No equipment maintenance or refueling operations shall take place within 150 feet of any stream or wetland.

Hazardous Materials: The Contractor shall notify the Project Manager/Project Geologist or their designee of any hazardous materials to be used on the job and will have Safety Data Sheets (SDS) for those materials available on the job.

Personnel Requirements: The Contractor shall furnish one drill crew consisting of at least one journey-level drill operator who is licensed by the Oregon Water Resources Department (OWRD) as a Monitoring Well Constructor, and at least one experienced drill helper. The drill operators shall have a minimum of five (5) years of experience as lead driller using mud rotary, auger and rock coring equipment, as appropriate.

All members of the drill crew must meet the OSHA 40-hour training (HAZWOPER) and other requirements of 29 CFR 1510.120. The Contractor shall submit proof of all required licenses and certifications 5 business days prior to the start of work.

The Project Manager or designee shall have the authority to require the replacement of any Contractor's personnel not exhibiting adequate capability or reasonable safety and responsibility in their job performance.

Such replacements shall be made within 48 hours after the Project Manager/Project Geologist provides notification to the Contractor.

Anticipated Surface & Subsurface Conditions:

The attached Site Plan shows the proposed boring locations. Based on review of geologic mapping and previous geotechnical explorations in the area, R1 Geo has developed the following understanding of anticipated subsurface conditions. Note the unit thickness described below are variable, and some units may be absent.

At the surface we anticipate encountering embankment fill and colluvium, a variable mix of cobbles, gravel, sand, silt, and clay. This unit may include occasional boulders and concrete and asphalt construction debris. We generally anticipate this unit ranges in thickness from approximately 10 to 40 feet.

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At the surface or below the fill/colluvial materials, we anticipate alluvium, consisting of fine-grained sand and silt. This material is anticipated to be approximately 6 to 18 feet thick.

Below the soils we anticipate bedrock of the Eagle Creek Formation. This is typically comprised of fresh to moderately weathered, extremely weak to medium strong (R0-R3) sandstone and conglomerate. A weathered zone of decomposed rock or residual soil may be encountered in the upper 10 feet or so of this unit.

Previous explorations reported a zone of perched groundwater within 3 to 5 feet of the top of the Eagle Creek Formation or its residual soil, at depths ranging from about 15 to 45 feet below ground surface.

Performance Requirements: The Contractor shall conduct standard penetration test (SPT) sampling in accordance with standard methods specified by the most recent version of American Society for Testing and Materials (ASTM), Designation D 1586. The contractor shall obtain undisturbed soil samples using the method specified by the most recent version of ASTM designation D 1587 "Thin-Walled Tube sampling of Soils" when conditions allow. If satisfactory samples cannot be obtained using standard “Shelby” tube equipment and methods, the contractor shall provide a piston-type or similar sampler in general accordance with ASTM D4823 at no additional cost.

SPT, undisturbed, and rock core samples shall be delivered in satisfactory fashion to the primary / secondary contact. The Contractor shall provide tubes and end caps for undisturbed samples and core boxes for core samples.

At the completion of each work shift, the site will be left clean and free of waste generated as a result of drilling operations by removal of items such as construction debris, trash, drill cuttings and fluids, and chemical spills. The Contractor may not wash off drilling equipment on-site unless equipment wash liquid is contained. Open boreholes, if any, will be covered securely with the drill rig or steel plates.

Upon completion of drilling operations in paved areas, the contractor shall sweep up residual debris and patch asphalt surfaces.

Upon completion of drilling operations in unpaved areas, the contractor shall re-contour any excavations or access roads to match original conditions. The contractor shall provide erosion prevention and stabilization measures, to include compost and/or straw mulch and the approved seed mix (Permanent (Native) Seeding, West Side of Hood River, Mix No. 1), as directed by ODOT. Erosion and sediment control shall be considered incidental.

Drilling, Sampling & Instrumentation: Provide exploration drilling and sampling as described below in Table 1. Borings will employ hollow stem auger, mud rotary, and rock coring methods. Drilling site sequence will be as directed by the primary/secondary contact. All holes shall be constructed and abandoned in accordance with OWRD rules and regulations.

Standard penetration tests (SPTs) will be performed every 2.5 feet within the first 20 feet of depth or as directed by the Project Manager/Project Geologist. Up to 20 feet of continuous SPT sampling will be required in three of the borings (TB23065-07, -08, & -09), as directed by ODOT. Below depths of 20 feet SPTs will generally be performed at 5-foot intervals, as directed by ODOT. Undisturbed samples will be collected as directed by the Project Manager/Project Geologist. Up to 30 to 40 feet of rock coring will be attempted within the Eagle Creek Formation in select borings. Depending upon the subsurface conditions, the depths and sampling intervals may be modified.

Vibrating wire piezometers (VWPs) will be installed in four borings. One of these will be located on the paved shoulder of I-84 WB and will require extending the VWP cabling beyond the guardrail to an above-ground monument to allow subsequent readings without the need for traffic control. The cabling will need to run underground between the borehole and monument, with the asphalt surface saw cut to enable the

Revision: 08/21/2025 Page 6 of 9 cable installation and patched upon completion of installation. Two VWPs will be installed in boreholes located in unpaved areas adjacent to the existing bridge and will require above-ground monuments. The remaining VWP will be installed in a borehole located on the paved Historic Columbia River Highway State Trail and will require a flush-mount monument.

Slope Inclinometer (SI) casing will be installed in two borings (TB23065-08 and -10), with anticipated depths of 45 and 75 feet. One of these will be located on the paved shoulder of I-84 WB west of the existing bridge and the other will be on the paved Historic Columbia River Highway State Trail south of the EB highway. Both will require flush-mount monuments.

Flush mount monuments for VWP shall be at least 12-inch diameter. Flush mount monument for SI casing only may be 8-inch diameter. Above ground monuments shall be at least 12 inches in diameter or 8 inches square. The above ground monuments shall be lockable. No bollards are required as the installations will be protected by guardrail or located away from the roadway. The above-ground monument should be steel and have a welded tab to allow locking with a Contractor-supplied keyed padlock. The contractor shall provide pre-fabrication drawings or sketches of the above-ground monument and cap for approval.

Inclinometer Installation Requirements: Inclinometers shall be constructed using 2.75-inch diameter inclinometer casing with machine broached grooves (Slope Indicator “QC Casing” with integral flush-mounted snap connection, or equivalent approved by the Geologist). A tremie pipe must be used to grout the inclinometer casing; grout valves will not be allowed.

Grout used for inclinometer and VWP installation will generally follow the table below.

Material Weight/Volume Weight Ratio Portland Cement 94 lb (1 sack) 1 Bentonite 25 lb* 0.3 Water 30 gallons (249 lb) 2.6

* - Approximate quantity, actual amount of bentonite will be adjusted to obtain the desired consistency

In accordance with manufacturer specifications and accepted industry practice, water and cement shall be mixed first to the specified water-cement ratio. After water and cement is thoroughly mixed bentonite shall be added to attain the desired consistency. The final amount of bentonite added to the grout may be more or less than that listed in the above table. Grout mix may be adjusted on site by the ODOT Project Geologist.

Revision: 08/21/2025 Page 7 of 9

Table 1. Borehole and Sampling Summary

Borehole ID Location / Access Assumed

Total Depth

(ft.)

Assumed Rock

Coring Footage

(ft.)

TB23065-01 Unpaved shoulder behind guardrail. Guardrail removal needed to access. Limited Access rig needed. Night work anticipated.

65 35

TB23065-02 Unpaved shoulder behind guardrail. VWP install with above-ground monument.

65 35

TB23065-03 Paved Historic Columbia River Highway State Trail.

Limited Access rig needed.

60 35

TB23065-04 Paved Historic Columbia River Highway State Trail.

Limited Access rig needed.

60 35

TB23065-05 Unpaved shoulder behind guardrail. Guardrail removal needed to access. Limited Access rig needed. Night work anticipated.

70 35

TB23065-06 Unpaved shoulder. Truck accessible. VWP install with above-ground monument.

65 35

TB23065-07 I84 WB right shoulder (paved). Night work anticipated. 45 10

TB23065-08 I84 WB right shoulder (paved). VWP install with above-ground monument behind guardrail. SI casing install with flush-mount monument. Night work anticipated.

45 10

TB23065-09 I84 WB right shoulder (paved). Night work anticipated. 45 10

TB23065-10 Paved Historic Columbia River Highway State Trail.

Limited Access rig needed. VWP & SI casing install with flush-mount monument.

75 10

TB23065-11 Paved Historic Columbia River Highway State Trail.

Limited Access rig needed.

60 0

NOTES: Assume one Shelby tube per boring

ODOT WILL PROVIDE THE FOLLOWING:

• Project Manager/Project Geologist or designee

• Sample jars

• Initial utility locate (One-Call) ticket numbers

• Vibrating wire piezometers (VWPs)

Revision: 08/21/2025 Page 8 of 9

BID ITEM DESCRIPTIONS

Administration – This item will be considered payment in full for all materials, equipment, labor, mileage and incidentals related to the administration of this contract. This includes but is not limited to record keeping, billing/accounting, production and submittal of the work plan, Pollution Control Plan, and written procedures for maintaining a safe working environment. Payment shall be lump sum.

Mobilization/Demobilization/Access - This item will be considered payment in full for all materials, equipment, labor, mileage and incidentals necessary to transport and stage all equipment and supplies to and from the Project site. This includes temporary guardrail removal and replacement, vegetation clearing, minor grading, and site mitigation upon completion of work. See “Access and Staging” and “Performance Requirements” sections for details. This item includes payment for any and all special equipment necessary to accomplish the job (e.g. platforms, vehicles, winches, etc.). Payment shall be lump sum.

Temporary Protection and Direction of Traffic (TP-DT) - This item will be considered payment in full for providing temporary protection or direction of traffic, including signs, equipment, and personnel necessary for freeway shoulder and lane closure during field operations. Payment shall be per shift.

Hollow Stem Auger and Mud Rotary Drilling - This item will be considered payment in full for all materials, equipment, labor, and incidentals necessary to prepare the site and complete the exploration drill holes to the depths required, obtain samples and perform tests at the required intervals, abandon these holes in accordance with Oregon Water Resources rules and regulations, patch existing pavement (where present), and site cleanup, including containment and disposal of drill fluids and cuttings. Drilling measurements and payment will be based on the nearest lineal foot.

Rock Core Drilling - This item will be considered payment in full for all materials, equipment, labor, and incidentals necessary to obtain the HQ rock core samples from the depths required and abandon these holes in accordance with Oregon Water Resources rules and regulations. Rock coring measurements and payment will be based on the nearest lineal foot.

3-inch Undisturbed Samples (Shelby Tubes) - This item will be considered payment in full for all labor, materials, equipment and incidentals necessary to perform these tests. Payment shall be per test.

Vibrating Wire Piezometer (VWP) Installation - This item will be considered payment in full for all labor, materials, equipment, and incidentals necessary to install a VWP at a depth of up to 60 feet within a drill hole. Payment shall be per VWP installed.

Slope Inclinometer (SI) Casing Installation - This item will be considered payment in full for all labor, materials, equipment and incidentals necessary to install and grout a 2.75-inch inclinometer casing in a drill hole. Payment shall be per lineal foot of installed casing. Any necessary caps, casing anchors, and couplings shall be considered incidental.

Monitoring Well Monument – Flush-Mount – This item will be considered payment in full for all materials, equipment, labor, and incidentals necessary to prepare the site and complete installation of a flush-mounted traffic-rated steel monument to cover and protect the well head where a VWP is installed, as detailed in the Drilling, Sampling & Instrumentation section above. Payment shall be per installation.

Monitoring Well Monument – Above-Ground - This item will be considered payment in full for all materials, equipment, labor, and incidentals necessary to prepare the site and complete installation of an above-ground monument to cover and protect the data logger in an unpaved area where a VWP is installed, as detailed in the Drilling, Sampling & Instrumentation section above. This bid item will include any associated locks, keys, and sand or pea gravel. Payment shall be per installation.

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OWRD Geotechnical Hole Reports - This item will be considered payment in full to prepare and submit Oregon Water Resources Department (OWRD) Geotechnical Hole Reports. The Contractor will provide a copy of each report to the Project Manager/Project Geologist upon submission to OWRD. Payment shall be per report.

Drums – The use of drums for segregation of contaminated soil may be required on this project. The Project Manager/Project Geologist will authorize the use of drums only if contaminated soil is encountered.

This item will be considered payment in full to supply DOT type 17-H steel drums, lids, and bolt secured rings. This item will be considered payment in full for all labor, materials, equipment and incidentals necessary to transport and offload labeled and secured barrels containing contaminated drill cuttings to the ODOT Maintenance sand shed yard at Wa Na Pa Street (US30) in Cascade Locks, Oregon. Entry through the locked gates requires coordination with the ODOT Geologist. Payment shall be per drum.

Standby - Standby is not anticipated on this project and is included here only as a contingency. Standby time shall be paid at an hourly rate to the nearest quarter of an hour, with a maximum of four (4) hours in any 24-hour period. Standby shall include all time during which the Contractor is unable to perform drilling work as a result of a directive from the Project Manager/Project Geologist. The Project Manager/Project Geologist will order standby at the offered rate if conditions warrant. Standby will include delays of work due to adverse weather conditions only if directed by the Project Manager/Project Geologist. Standby will not be paid for delays of work resulting from equipment failure, lack of required equipment, or safety issues that are not weather-related. Standby will not be paid unless authorized, in advance, by the Project Manager/Project Geologist.

OREGON DEPARTMENT OF TRANSPORTATION

REGION 1 GEO-HYDRO-HAZMAT

I-84: Moffett Creek Bridge Replacement

Columbia River Highway Multnomah County

N

NOT TO SCALE

Figure 1 – Site Location Map

SITE

I-84: Moffett Creek Bridge Replacement

Columbia River Highway Multnomah County

N

NOT TO SCALE

Figure 2 – Vicinity Map

SITE

I-84: Moffett Creek Bridge Replacement

Columbia River Highway Multnomah County

Figure 3 - Site Plan

Proposed boring

Guardrail removal location, approximate

N

1 inch = 100 feet

I-84: Moffett Creek Bridge Replacement

Columbia River Highway Multnomah County

Figure 4 – Proposed Drill Locations

NW Corner of Bridge – TB23065-05

Proposed Drill Locations

NE Corner of Bridge – TB23065-01

State Trail Undercrossing of WB Bridge -

TB23065-03 & -04

SW Corner of Bridge – TB23065-06

I-84: Moffett Creek Bridge Replacement

Columbia River Highway Multnomah County

Figure 5 – Proposed Drill LocationsState Trail South of EB Highway – TB23065-10 & -11

SE Corner of Bridge – TB23065-02 WB Highway Shoulder – TB23065-07, -08, & -09

TM861

FREEWAY SECTIONS

T M

.d g n

01-JUL-2020N/A

J U

L

"L"

2'

W 8-

NOTES:

EDGE

ABRUPT

(All stages)

36x24

R2-6aP

B A 2 A

30'±30'±

300'±

30'±

300'±

Median

A

A

A

AC B A

See INSET "A"

Median mi.±2

30'±30'±30'±

8' B(III)R 8' B(III)R

under construction

End of area under construction

Start of area traffic adjacent to

Abrupt edge

Use "LEFT SHOULDER CLOSED" sign.

For left shoulder work, place TCD to close the left shoulder.

NOTE:

Sequential Arrow

(Mount on TSS)

(As needed)

(Mount on TSS)

(Mount on TSS)

C W

C W

W a

W a

W

(Roll-up sign)

CW21-9

32x11

32x11

32x11

(All stages)

36x24

R2-6aP

(All stages)

36x24

R2-6aP

W

W

W

W

W

W

W

W

Traffic

Under

Construction

Under

1000'

Taper

"B"

Buffer

"B"

Buffer

"B"

Buffer

"B"

Buffer

"B"

Buffer

AHEAD

WORK

ROAD

DOUBLE

FINES

CLOSED

SHOULDER

RIGHT

CLOSED

SHOULDER

RIGHT

"L"

RIGHT

LEFT

CENTER

AHEAD

WORK

ROAD

DOUBLE

FINES

½ MILE

CLOSED

RIGHT LANE

½ MILE

CLOSED

RIGHT LANE

AHEAD

WORK

ROAD

DOUBLE

FINES

(As needed)

54x18

CW21-8B

EDGE

ABRUPT

CENTER

(As needed)

54x18

CW21-8B

EDGE

ABRUPT

CENTER

BUMP

(As needed)

BUMP

(As needed) W

W

GENERAL NOTES FOR ALL DETAILS:

To be accompanied by Dwg. Nos. TM820, & TM821.

signed by the State Traffic Engineer.

* Regulatory speed reductions on State Highways require a Speed Zone Order

*Temp. Regulatory Speed Zone Reductions.

work zone, including; PMCS, Radar Speed Trailers, Advisory Speed signing, Additional traffic control devices may be used, as directed, to enhance the area. Locate TMA as per manufacturer's instructions, or as directed.

Truck Mounted Attenuator (TMA) should be used to protect the active work

AHEAD" (W20-5) signs and the appropriate "LEFT LANE ENDS" (W4-2) signs.

For work in the left lane, place TCD to close the left lane. Use "LEFT LANE CLOSED

UNDER CONSTRUCTION

UNDER TRAFFIC

Median

C

30'±

(All stages)

36x24

R2-6aP

W

DOUBLE

FINES

AHEAD

WORK

ROAD

W bAHEAD

CLOSED

SHOULDER

RIGHT

W bAHEAD

CLOSED

SHOULDER

RIGHT

unless otherwise directed.

For Freeway preservation work use Dwg. No. TM880, Remove rumble strip according to the plans and Dwg. No. TM830.

Do not stage traffic across longitudinal shoulder rumble strips.

plaques to the sign face using hook and loop fasteners.

If roll-up signs are used, attach the correct (CW21-9) where applicable.

"BUMP" (W8-1) signs to be installed on both sides of highway throughout area under construction where applicable.

mile intervals2 1to be installed on both sides of highway at

Additional ''ABRUPT EDGE''(CW21-(7,9)) signs with appropriate riders of 1 inch or greater.

Use "ABRUPT EDGE" (CW21-(7,9)) signing for longitudinal abrupt edges

CONTROL DEVICES (TCD) SPACING TABLE" on Dwg. No. TM800.

To determine sign spacing A, B, and C, use "TRAFFIC on Dwg. No. TM800 to determine Taper Length "L" and Buffer Length "B".

Unless otherwise shown, use the "MINIMUM LENGTHS TABLE"

TM822 for Concrete Barrier Sign Support details.

with a maximum 12 sq. ft. of total sign area. See Dwg. No.

Use Concrete Barrier Sign Supports for mounting signs with the work areas, shall move with the work areas.

Signing and other TCD shown to be installed in conjunction

Flaggers are not permitted to stop or hold freeway traffic.

48x24

CG20-2A

ROAD WORK

END

48x24

CG20-2A

ROAD WORK

END

SHOULDER CLOSURE

Divided Highway or Freeway

ONE LANE CLOSURE

Divided Highway or Freeway

(Signing Detail)

INSET "A"

SECTION A-A

on 40' max. spacing.

Temp. Plastic Drums the current Oregon Standard Specifications.

All materials shall be in accordance with

DATE REVISION DESCRIPTION

OREGON STANDARD DRAWINGS

DATE

SDR

BOOK NO.

CALC.

Effective Date: June 1, 2025 - November 30, 2025

Professional Engineer.

first consulting a Registered and should not be used without sole responsibility of the user principles and practices, is the generally accepted engineering designed in accordance with

Standard Drawing, while

The selection and use of this