234042 Technical Specifications~1.pdf

Special Provisions Page 1

UNDERWATER SERVICES

PROJECT DESCRIPTIONS

General Underwater Services: The scope of work to be provided by the Contractor includes all necessary services to provide underwater inspection, cleaning, repair, and construction as requested by the City.

Typical work assignments may include inspecting bridge foundations, underwater inspection of reservoirs, diversion structures, dredging material from intake and outfall structures, or any other underwater services needed to maintain, clean, inspect, repair or construct the City’s infrastructure.

Water Treatment Plant and Water Reservoir Services: The scope of work to be provided by the

Contractor includes all necessary services to complete a comprehensive internal inspection of water reservoirs, fish screens, and cleaning and removal of sediment and debris, and disinfection. The cleaning, inspection, and disinfection of the water-storage facilities will be done in accordance with ANSI/AWWA

Standard C652.02, Disinfection of Water-Storage Facilities. The inspection and cleaning shall take place either with the reservoir isolated, in normal water level operations, or off-line when the reservoir is drained.

Wastewater Treatment Plant work: The scope of work to be provided includes all necessary services to complete in-water inspection of the wastewater outfall(s) in the Willamette River, Remotely Operated

Vehicle (ROV) or diver internal inspection of 54-inch outfall pipe and all necessary repair work on the outfall(s). The project activities may include internal and external inspections and repair/replacement of broken risers on the existing effluent diffuser. This work will typically take place during the summer when river and wastewater flows are at their lowest.

STANDARD SPECIFICATIONS

100 CONTROL OF WORK

100.01 NOTIFICATIONS RELATIVE TO CONTRACTOR’S ACTIVITIES - The

Contractor shall notify the following prior to work:

1.Salem Fire and Police Departments ......................................................................... 503-588-6123

2.Salem Public Works Field Office ............................................................................. 503-588-6333

100.02 PROTECTION OF PROPERTY -

Residents and businesses in the area shall be notified at least 48 hours prior to the beginning of construction in order to permit property owners/occupants to remove vehicles, trailers, and other possessions as well as salvage near the reservoir to allow access and work to commence.

101.01 PERMITS

Street/Lane/Alley/Sidewalk Closures

The Contractor shall be responsible to obtain a no-charge “Street/Lane/Alley/Sidewalk Closure

Permit” from the City of Salem Department of Public Works Engineering Division, 48 hours prior

Special Provisions Page 2 to the closure of any street, alley, or land involved with the construction of this project. The

Contractor shall be responsible for the notification of the agencies identified in the section 105.05 of these special provisions.

103.10 RIGHTS-OF-WAY, EASEMENTS, AND PREMISES

A written “Permit of Entry” signed by the property owner is required prior to work under this contract being done on private property that is outside an established easement. The city will obtain a “Permit of Entry” in areas where construction will occur on private property. An example of the form can be obtained from the Project Engineer. Work shall not begin on private property until the executed “Permit of Entry” form for the particular parcel has been approved by the City and forwarded to the Contractor. The Contractor shall abide by the conditions on the executed “Permit of Entry” from. The Contractor shall be responsible for coordination with property owners/occupants and notify the same at least 48 hours in advance of beginning work on private property and when sewer service will be interrupted. The notification shall be by means of a “door hanger” or other approved notification method.

CONTRACTOR’S REQUIRED EXPERIENCE

The Contractor shall have five (5) years prior experience in cleaning and inspection in underwater reservoirs. The Contractor shall provide, with the proposal or prior to award, the proper reference documentation of experience with the submission of the “PROJECT REFERENCE

FORM” located in the proposal section of this bid document. Failure to provide the requested information on the form provided shall result in the Contractor being “Non-Responsive” and shall not be considered for the contract award. Reference documentation shall include the project name, project date(s), brief description of the services, and contact information.

TECHNICAL SPECIFICATIONS

General Underwater Services

1. Description of Work. The Contractor will be provided with a scope of work from the City.

The Contractor shall have ten (10) days to submit a cost for services proposal based on the hourly rate established in this bid document.

2. Safety and Health Requirement. The Contractor shall comply with all State and Federal, AWWA, ANSI standards and regulations applicable to confine spaces, and comply with the

Federal Occupational Safety and Health Act, as amended. If the assignment involves work in the water system, the contractor must also follow all requirements for working in a potable water and water vessels included in the contract.

3. For each assignment, the Contractor shall provide the City with a copy of the protocol and procedures to be followed for a specific assignment. This information will be provided to the

Project Manager at the pre-construction meeting.

4. Measurement and Payment

a. The contractor shall submit proposal based on the number of staff hours needed to complete

Special Provisions Page 3 the work for a specific task based on the bid amount.

b. The hourly rate for the Underwater Diver shall include all equipment, expendables, and all other material needed for a diver to provide underwater services.

c. The hourly rate for the Topside Crew shall include the cost of all staff, equipment, expendables, and all other activities needed to support the Underwater Diver in completing their work.

d. All materials needed to complete the assigned task will be paid based on the cost of the material plus 12%.

e. All rental equipment needed to complete a specific task will be paid based on the rental rate paid by the contractor plus 12%.

Technical Specifications Page 1

TECHNICAL SPECIFICATIONS

Water Treatment Plant and Reservoir Services

1. Table 1: Description of Reservoirs and Intakes

Reservoir Date Built

Location Capacity

(MG)

Reservoir

Type Dimensions

Floor Surface

Area (ft2) Special

Considerations

Fairmount 1936 Salem 10 Concrete 180' x 360' x 22' H 64,800

Candalaria 1940 Salem 0.5 Concrete 122' x 48' x 15' H 5,856 Online Dive Only

Kurth 1954 Salem 1 Steel 76' Dia x 47' H 4,536 Above Ground

College 1957 Salem 0.5 Steel 44' Dia x 44' H 1,520 Above Ground-

Online Dive Only

Seeger 1960 Salem 1.5 Steel 76' Diax 47' H 4,536 Above Ground

Eola #2 1962 Salem 0.175 Concrete 52' x 32' x 15' H 1,664 Online Dive Only

Glen Creek 1972 Salem 2 Concrete 167' x 93' x 22' H 15,531 No local sewer

Mountain View 1972 Salem 10 Concrete 290' Dia x 20' H 66,051

Mader 1974 Salem 1.5 Steel 65' x 48' H 3,318 Above Ground

Skyline 1978 Salem 1.25 Concrete 92' x 92' x 20' H 8,464 No local sewer

Chacarun 1980 Salem 2 Concrete 130' Dia x 22' H 13,273 No local sewer

Croisan Mountain 1991 Salem 0.85 Concrete 85' Dia x 20' H 5,674 Online Dive Only

Eola #1B 2001 Salem 0.8 Concrete 97' Dia x 16' H 7,389 Online Dive Only

Grice Hill 2002 Salem 2.2 Concrete 70' Dia x 21.5 ' H 3,848

Lone Oak 2003 Salem 5.6 Concrete 196' Dia x 21' H 30,171

Franzen - East Cell 2004 Turner 42 Earthen 900' x 300' x 30' H 270,000

Franzen - West Cell 2004 Turner 47 Earthen 1100' x 300' x 30' H 330,000

Mill Creek 2014 Salem 2.2 Concrete 140' Dia x 20' H 15,393 Above Ground-

Online Dive Only

Champion Hill 2006 Salem 2.2 Concrete 140' Dia x 20' H 15,393 Above Ground

Structure Date

Built Location Material

Dimensions

Special

Considerations

Geren Island Middle Intake 1998 Stayton Steel/Concrete 120' x 6' Fish Screens

Geren Island Upper Intake 2009 Stayton Steel/Concrete 6' x 6' Fish Screens

2. Description of Work

2.1 The work consists of completing a comprehensive internal inspection of water reservoirs, fish screens and may include cleaning and removal of sediment and debris. The inspection and cleaning shall take place either with the reservoir isolated and in normal water level with direct outside communication from support team and outside supplied air or SCUBA supplied air or with the reservoir drained. SCUBA divers may be allowed, but shall be required to be completely encapsulated so that no part of skin or body is in contact with the water. All personnel and equipment used to complete this work shall meet the requirements as specified in ANSI/AWWA

Standard C652.02, Disinfection of Water-Storage Facilities. All cleaning, inspection, and/or

Technical Specifications Page 2 disinfection shall be done in accordance with ANSI/AWWA Standard C652.02, Disinfection of

Water-Storage Facilities. A live video feed shall be provided during underwater inspection and cleaning operations for the intent of viewing and documentation of work that is completed. The

Contractor shall provide the City with a DVD copy of the live video feed and paper documentation of the inspection cleaning as required from the Contract Administrator. The Contractor is admonished that the work is not guaranteed and is subject to change. Area maps showing the locations of the reservoirs and the nearest sewer line are included with this contract. Specific information from each reservoir shall be made available upon request or shall be given in the fiscal year in which the reservoir is to be cleaned and inspected.

Due to the high level of detailed underwater inspection required to adequately inspect the underside of the floating cover and the lining covering the floor and sides at Franzen Reservoir, SCUBA or remotely operated vehicles are the recommended inspection methods to obtain the level of detailed inspection.

The Geren Island middle and upper intake work consists of visually inspecting the entire front and backside of the fish screens as well as the air manifold piping and related connections for damage, gaps, debris, or other issues which may impact the operation of the fish screens. The inspection will also include a measurement of sand, silt and/or debris both within the intake structure as well as in front of the intake structure between the bar rack and the fish screens. The inspection shall take place in a free flowing river environment with flow moving laterally along the screens as well as through them. This work shall be completed during low flow conditions typically the summer months of May through August.

Applicable Standards:

1. 29 CFR Part 1910, Subpart T

2. CCR, Title 8, Subchapter 7, Group 26, Article 152

3. CCR, Title 8, Cubchapter 7, Group 26, Article 153

4. ANSI/AWWA C652-02 - Disinfection of Water Storage Facilities

Technical Specifications Page 3

2.2 Schedule for Reservoir Cleaning and Inspection:

CITY OF SALEM

STORAGE RESERVOIR CLEANING AND INSPECTION PLAN*

FY 2034/2024 FY 2024/2025 FY 2025/2026 FY 2026/2027

Mader Candalaria Kurth Croisan Mountain

Seeger Grice Hill Mountain View Eola 1B

College Lone Oak Glen Creek Eola 2

Fairmont Skyline Chakarun

Intake Screen

Inspection Only

Intake Screen

Inspection Only

Intake Screen

Inspection Only

Intake Screen

Inspection Only

Franzen – East

Franzen – West

Inspection Only

Franzen – East

Inspection Only

Franzen – West

*All reservoirs shall be cleaned and inspected unless otherwise noted. The schedule is tentative only and is subject to change

3. Reservoir Inspection

3.1 Inspection shall include:

3.1.1 External condition of the reservoir.

3.1.2 All internal surfaces of the reservoir.

3.1.3 All internal piping, valves, fittings that are visible.

3.1.4 All internal structures: metal, concrete, and linings.

3.1.5 All internal joints, keyways, and seams.

3.1.6 Steel Reservoirs interior and exterior paint coatings shall also be inspected.

3.1.7 Franzen Reservoir: inspect any drain hoses from top to bottom, the bottoms of all rain water collection troughs; floating cover and liner conditions at reservoir inlets and outlets, valves, gates, cover support structures, rain water collection troughs, all penetrations, and areas of known chafing such as at rainwater removal equipment, trough intersections, and any structures on slope. Inspect depth and extent of debris accumulations on bottom of reservoir. Inspect all seams within the reservoir for damage or leaks along with the membrane for splits.

3.18 Geren Island Upper and Middle Intakes: Inspect all fish screen faces (both front and back), joints, seams and connections. Inspect for debris buildup in front of as well as behind the screens.

Inspect air manifold system behind fish screens for leaks or damage.

A sequence of inspection events shall be provided and shall be maintained with each year’s

3.2 Inspection reporting/documentation.

3.2.1 Provide a written report of all findings, both defective and non-defective.

3.2.2 Provide representative DVD CD’s and digital color pictures of all inspected items and defects.

All photos/videos shall be labeled and dated.

3.2.3 Provide real time video footage for periodic inspection of work in reservoirs.

Technical Specifications Page 4

3.2.4 Provide summary of findings, and recommendations for each reservoir if defects are found.

3.2.5 Video footage to provide visual documentation of debris with a vertical measuring scale to verify depths.

3.3 Measurement and Payment

3.3.1 Measurement for the inspection of the reservoirs shall be for each reservoir inspected.

3.3.2 Payment shall be lump sum for all things necessary to complete an internal inspection and provide a summary report. Payment shall include necessary items required for inspection

(i.e. lighting, portable generator, safety equipment, scaffolding, etc.) as needed.

4. Cleaning of Reservoirs

4.1 Description of work

The work consists of cleaning all sediment and debris of each reservoir and disposal. Disposal of material and water can be at the nearest sewer manhole. The location of this manhole will be shown on the plans. Do not dispose of waste material to storm drain piping, ground, or ditches unless contractor can de-chlorinate the water and provide erosion protection when nearest waterway is less than 1000 feet away from discharge area. Waterways further than 1000 feet shall be required to have erosion protection only. Disposal of waste material on the ground shall be approved by the

Project Manager prior to any work performed.

4.2 Measurement and payment

4.2.1 Measurement

Sediment and debris shall include any loose silt, fine sand, and debris. Before cleaning, contractor shall take measurements to determine average depths of sediment. These depths shall be documented via video footage. Estimate of sediment depth shall be based on this measurement times the floor area. This measurement shall be converted to a square yard.

4.2.2 Payment

Payment for in-water reservoir inspection and cleaning shall be on per square yard basis for inspection and cleaning of sediment removed and disposed of from the site. Payment shall also include provisions for traffic control and proper disposal of sediment, and erosion control as needed.

Payment for off-line concrete or steel reservoirs shall be on a per square yard basis for inspection of reservoir, the paint or coating system and other appurtenances within the reservoir. Payment shall also include provisions for traffic control and proper disposal of sediment, and erosion control as needed.

Payment for inspection only of on-line reservoirs shall be on an hourly basis to inspect the depth of sediment inside the reservoir, inspection of any drain hoses from top to bottom, the bottoms of all rain water collection troughs, inspection of the floating cover conditions at reservoir inlets and outlets, valves, gates, cover support structures and rain water collection troughs, all penetrations, Technical Specifications Page 5 and areas of known chafing such as at rainwater removal equipment, trough intersections, and any structures on slopes. Payment shall also include the inspection of all seams within the reservoir for damage or leaks along with the membrane for splits.

5. Disinfection of Reservoirs

5.1 The contractor may be called upon to disinfect reservoirs that have been emptied for various reasons.

5.2 Disinfection and chlorination procedures shall be completed in accordance with ANSI/AWWA

Standard C652.02, Disinfection of Water-Storage Facilities.

5.3 Disinfection and chlorination shall be completed on all interior surfaces of the reservoir.

5.4 All OSHA and City of Salem safety rules and regulations will be followed during disinfection and chlorination procedures.

5.5 Payment for disinfection and chlorination of off-line reservoirs shall be based on the square footage of the floor. Square footage calculations will be based off of dimensions listed for each reservoir in Table 1.

6. Safety and Health Regulations

6.1 The contractor shall comply with all State and Federal, AWWA, ANSI standards and regulations applicable to confine spaces, working in potable water and water vessels and comply with the

Federal Occupational Safety and Health Act, as amended.

6.2 The Contractor shall provide the City with a copy of the protocol and procedures at the pre-construction meeting for the following:

6.2.1 Disinfection and chlorination procedures in accordance with ANSI/AWWA

Standard C652.02, Disinfection of Water-Storage Facilities.

6.2.2 Inspection and cleaning of the reservoir isolated.

6.2.3 Inspection, cleaning and disinfection of the reservoir off-line (drained).

6.2.4 Inspection procedures of Franzen Reservoir.

6.2.5 Inspection procedure for the upper and middle intakes at the Geren Island Water

Treatment Facility.

6.2.6 Traffic Control plans and plans for waste removal (in the case of the above ground steel tanks).

These procedures shall be approved by the Project Manager prior to start of any work.

6.3 Special Conditions:

All equipment, including dry suits, must be dedicated for potable water use only. Two people, in addition to the diver, shall be present at all times, and shall maintain constant audio and visual contact. Divers shall be supplied with appropriate safety measures in the case of an emergency.

Hatches shall be inspected, unlocked and opened to provide the maximum amount of lighting and allow for diver egress in emergencies.

Technical Specifications Page 6

A life jacket or floatation device shall be worn by any individual working on a floating reservoir cover. All sharp objects shall be removed from any individual working on a floating cover.

Workers shall always wear smooth-soled rubber shoes of boots when walking on lining material.

At no time shall equipment or material be dragged across the floating cover. All equipment such as lights, blowers, vacuums, pumps, hoses, etc. shall have their bottoms padded to prevent damage to or scuffing the floating cover material. Gasoline, oils, or other petroleum products shall not be allowed to contact the floating cover.

The surface of the floating cover membrane is extremely slippery when wet. Personnel should exercise caution when walking on reservoir slopes when the material is wet. Personnel on the floating cover create localized depressions that will rapidly collect surface water. It is recommended that individuals walk on floats, where available, when standing water is present on the floating cover. Standing water on the cover may be an indication of a hole or tear in the membrane and should be approached with caution.

Personnel walking on the floating cover should exercise caution near the rainwater collection troughs. The depth of some of the troughs may be greater than six feet. Hydrostatic pressure from the water under the floating cover tends to push the walls of the trough closed and may make exit difficult.

7. Water Reservoir Operations

7.1 The concrete reservoirs may be inspected and cleaned in the active normal operating condition.

The water levels may vary. No valves shall be operated by the Contractor. Contractor shall coordinate work schedules with City personnel and no work shall prevent the normal operation of the reservoirs. Concrete reservoirs may be cleaned with reservoir off line. The Contractor shall be contacted and work shall be coordinated if not designated in the cleaning schedule listed in Section

2.2.

7.2 The steel above ground reservoirs may be inspected and cleaned with the reservoir off-line and drained. No valves shall be operated by the Contractor. Contractor shall coordinate work schedules with City personnel.

7.3 Access to and within each reservoir shall be by the City. All reservoirs are secured. No keys shall be given to the contractor. City Inspector will open and close reservoir access for each day of work by Contractor.

WASTEWATER TREATMENT PLANT WORK:

1. Description of Outfall

The City of Salem, Willow Lake Water Pollution Control Facility (WLWPCF), currently operates an outfall diffuser for distribution of its effluent at river mile 78.4 on the Willamette River. The outfall was constructed in 2004. The outfall pipe is 54-inch HDPE pipe line with forty-two 12-inch riser pipes with diffuser check valves extending upward from the buried main pipe line. This design provides mixing of the wastewater effluent from the treatment plant, and is required as part of the NPDES permit for releasing wastewater effluent into the Willamette River.

Technical Specifications Page 7

2. Description of Work

2.1 Wastewater Treatment Plant work: The work consists of completing inspections and/or repairs of wastewater outfall piping and diffusers, and may include cleaning and removal of sediment and debris from the inside of the 54-inch pipe line or outside the pipe around the 41 diffusers. The work shall take place in a free flowing river environment. This work shall be completed within the designated in-water work period (June 1-September 30). The work shall take place with the outfall pipe active. Inspection may be performed by remotely operated vehicles, or with divers having direct outside communication from support team and SCUBA supplied air. A live video feed shall be provided during underwater inspection, cleaning, or repair operations for verification of work that is completed. The contractor shall provide the City with a DVD copy of the video and paper documentation of the work, as required from the Contract Administrator.

Repair work shall be done similarly to inspection work, with appropriate tools and incidentals for work on large HDPE piping and fittings. The Contractor is admonished that the work is not guaranteed and is subject to change.

3. External Inspection and Cleaning of Diffuser Outfall

3.1 Inspection shall include:

• External condition of the outfall pipe, risers and diffuser valves.

• Remove large woody debris from outfall and send downstream. Removal of any foreign material from around the outfall

• Documentation of the amount of accumulation of rocks, debris, and gravel around the 12 inch vertical risers and duckbill diffusers.

A sequence of inspection events shall be provided and shall be maintained with each year’s inspection.

3.2 Inspection reporting/documentation.

• Provide a written report of all findings, both defective and non-defective.

• Provide representative DVD’s, CD’s and digital color pictures of all inspected items and defects. All photos/videos shall be labeled and dated.

• Provide real time video footage for periodic inspection of work in outfall.

• Provide summary of findings, and recommendations for riser and diffuser valve if breakages are found.

• Provide video footage to provide visual documentation of debris with a vertical measuring scale to verify depths.

3.3 Measurement and Payment

Measurement for the inspection of the outfall pipe shall be per an agreed upon scope with not to exceed value. Inspections performed by remotely operated vehicles will be measured per each

Technical Specifications Page 8

Payment shall be lump sum for all work necessary to complete an inspection and provide a summary report. Payment shall include necessary items required for inspection (i.e. lighting, boat, portable generator, safety equipment, scaffolding, etc.), as needed.

4. Internal Inspection of Outfall Pipe

4.1 Inspection shall include:

• All internal surfaces of the outfall pipe.

• Depth and extent of debris accumulations on bottom of pipe.

A sequence of inspection events shall be provided and shall be maintained with each year’s inspection.

4.2 Inspection reporting/documentation.

• Provide a written report of all findings, both defective and non-defective.

• Provide representative DVD’s, CD’s and digital color pictures of all inspected items and defects. All photos/videos shall be labeled and dated.

• Provide real time video footage for periodic inspection of work in outfall.

• Provide summary of findings, and recommendations for riser and diffuser valve if breakages are found.

• Provide video footage to provide visual documentation of debris with a vertical measuring scale to verify depths.

4.3 Measurement and Payment

Measurement for the inspection of the outfall pipe shall be per an agreed upon scope with not to exceed value. Inspections performed by remotely operated vehicles or diver will be measured per each inspection.

Payment shall be lump sum for all work necessary to complete an internal inspection and provide a summary report. Payment shall include necessary items required for inspection (i.e. lighting, portable generator, safety equipment, scaffolding, etc.), as needed. Inspection performed by remotely operated vehicles will be paid for on a lump sum basis to provide full inspection of outfall pipe.

5. Internal Cleaning of Outfall Pipe

5.1 Cleaning shall include:

• Removal of all sediment and debris from the bottom of the pipe through a method approved by the project manager.

• Disposal of material may be on the bank along the river’s edge. Disposal of waste material shall be approved by the Project Manager prior to any work being performed.

Technical Specifications Page 9

5.2 Measurement and payment

5.21 Measurement

Sediment and debris shall include any loose silt, fine sand, and debris on the floor. Before cleaning, contractor shall take measurements to determine average depths of sediment. These depths shall be documented via video footage. Estimate of sediment depth shall be based on this measurement.

5.22 Payment

Payment for internal cleaning shall be per cubic foot basis with agreed upon proposal for not-to-exceed rate based on inspection estimate for cleaning of sediment removed and disposed of from the site. Payment also includes provisions for proper disposal of sediment, and erosion control as needed.

6. Repairs to Outfall Diffusers

6.1 Description of work

The work consists of required repairs to any of the 42 risers along the outfall diffuser pipe. The risers may be broken above the flanged fitting, or sheared below the flange. For those risers broken above the flange, the flange should be removed, and a new diffuser valve assembly should be installed in its place. Materials will be provided by Owner. Contractor need only provide labor and tools. Diffuser valves and riser pipes that are broken off shall be removed from the river bed and delivered to Owner. The number of diffuser valves needing replaced may vary, depending on the conditions of the outfall at the time of the work. It is estimated as many as 12 risers could need replaced in the first year, and subsequent years would require a variable number of diffusers to be replaced until all 41 have been replaced. Due to buildup of sediment and debris around the diffusers it may be necessary to use compressed air to clear the area around the repair zone. The compressor shall be located on boat or on the shore.

Site access will be from an existing road that leads to the outfall and diffuser. Divers may enter the river at the outfall or from a boat anchored near the site. Inspection and repairs will be accomplished using an air compressor to clear the small area around each riser, and standard wrenches and sockets to replace the broken risers.

No dewatering or work area isolation will be necessary. The inspection and repair will be done during the designated in-water work period (June 1-September 30).

6.2 Measurement and payment

All repair work will be done on a per day basis, with agreed upon proposal for not-to-exceed value.

Payment will be made by lump sum upon completion of work, and upon review of recorded video.

This work may be required on a yearly basis.

Technical Specifications Page 10

7. Safety and Health Regulations

7.1 The contractor shall comply with all State and Federal, AWWA, ANSI standards and regulations applicable to confine spaces, working in potable water and water vessels and comply with the

Federal Occupational Safety and Health Act, as amended.

7.2 The Contractor shall provide the City with a copy of the protocol and procedures at the pre-construction meeting for the following:

1. Inspection and cleaning of the outfall.

2. Inspection of outfall via remotely operated vehicle.

3. Repairs to outfall and diffusers.

4. Erosion control and sediment control.

These procedures shall be approved by the Project Manager prior to start of any work.

7.3 Special Conditions:

Two people, in addition to the diver, shall be present at all times, and shall maintain constant audio and visual contact. Divers shall be supplied with appropriate safety measures in the case of an emergency.

A life jacket or floatation device shall be worn by any individual working on boat.

Personnel should exercise caution due to the fact that the Willamette is a navigable river.

8. Internal Inspection or Cleaning Operations

8.1 City staff will do a plant shut-down or divert flow around the outfall diffuser before the ROV or diver will be lowered into the pipe. Duration of the shut-down or diversion will be discussed during the pre-inspection/pre-cleaning meeting.