Attachment C

Scope of Work

FOR THE

UNDERWATER REMOTELY-OPERATED

VEHICLE (ROV) INSPECTION

OF THE

PACHECO TUNNEL REACH 1

JUNE 2015

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1.0 PROJECT OBJECTIVE

The Santa Clara Valley Water District (District) is conducting an underwater remotely-operated vehicle (ROV) inspection for the Pacheco Tunnel Reach 1. The Pacheco Tunnel Reach 1 is a raw water transmission conduit running underneath the San Luis Reservoir. The objective of the inspection is to perform an underwater inspection of the tunnel with the ROV. The data collected from the inspection will be used to determine the current condition of approximately 9,400 feet of tunnel section and to develop future monitoring schedules and maintenance and rehabilitation plans. Both the Pacheco Tunnel Reach 1 and the San Luis Reservoir are located in Merced County, about halfway between Gilroy and Los Banos, CA. The San Luis Reservoir is several miles off the State Highway 152 (HWY 152). To limit potential impacts to the District’s water supply system, the tunnel inspection will be performed and completed in a four (4) work day time period with a two (2) work days to perform the actual inspection.

2.0 ABBREVIATIONS AND DEFINITIONS The following abbreviations and terms or pronouns in place of them are used; the intent and meaning shall be interpreted as follows:

Bureau U.S. Bureau of Reclamation Cal/OSHA California Division of Occupational Safety and Health Administration Caltrans State of California, Department of Transportation

District Santa Clara Valley Water District Engineer Designated District Engineer for this Project ISO International Organization for Standardization OSHA Occupational Safety and Health Administration

3.0 PROJECT BACKGROUND

In late-2007, the District performed an Initial Asset Evaluation for the Pacheco Tunnel Reach 1. It was discovered that a video camera inspection would not provide much useful information in a submerged, enclosed, and highly-turbid large-diameter pipe. So, an underwater sonar inspection was selected as the best alternative to inspect the Pacheco Tunnel Reach 1 under the low visibility and high turbidity surroundings. Sonar profiling utilizes acoustic signals to sound the surface of the tunnel. An underwater ROV profiler with sonar capabilities was lowered into the tunnel and tethered via a fiber optic cable to a computerized data collection system inside a parked vehicle on the ground surface. Utilizing a single access point at the Pacheco Pumping Plant, the underwater ROV inspected approximately 5,200 feet from the Pacheco Pump Station towards Tunnel Island, successfully mapping just over 50% of the targeted length of the whole tunnel; the remaining 4,700 feet was not inspected. The District has not done any inspections on the Pacheco Tunnel Reach 1 since 2007. no further inspection has been conducted on the 5,200 feet previously mapped, nor has the remaining 4,700 feet Since 2007, however, no further inspection has been conducted on the Pacheco Tunnel Reach 1. The

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District believes that an up-to-date ROV inspection of the entire tunnel would help establish the baseline condition for the entire Pacheco Tunnel Reach 1. Based on the lessons learned from the 2007 inspection, approximately half of the tunnel can be inspection from the Pacheco Pumping Plant, and the other half of the tunnel can only be inspected when there is a low level of water at San Luis Reservoir. This would expose an intake structure in the middle of the reservoir that allows for an additional access point to the tunnel. Due to this year’s drought, the District is anticipating a potential low point in the San Luis Reservoir in the coming months. This low point would provide the District with an opportunity to go back and complete the tunnel inspection. 3.1 PACHECO TUNNEL REACH 1 DESCRIPTION 3.1.1 General

A. There are three access points to enter the unmapped portion of Pacheco Tunnel Reach 1: the 313 Lower Intake, the 370 Upper Intake, and the Gate Shaft on Tunnel Island.

Access Point Stationing Access Elevation

313 Lower Intake 102+40 313.00’

* 370 Upper Intake 105+04 370.00’

Gate Shaft on Tunnel Island 125+40 ~586.00’

When the San Luis Reservoir is at the projected low point, both the 370 Upper Intake and the Gate Shaft are expected to be accessible for the inspection while the 313 Lower Intake remains unavailable. However, the terrain on Tunnel Island would make it difficult to move the required equipment and vehicles to the Gate Shaft. Therefore, access to the tunnel is exclusively available ONLY through the 370 Upper Intake.

B. The 5,200 foot section that was mapped in 2007 is most easily accessible by a Surge Structure

located on the site of the Pacheco Pumping Plant.

Access Point Stationing Access Elevation

Surge Structure at Pacheco Plant 199+07 ~589.00’

This same Pacheco Plant Surge Structure was used in 2007 to map approximately 5,200 feet upstream and another 200 feet downstream in the direction of the pumping plant. It is accessible regardless of reservoir levels.

C. All of the said access points to Pacheco Tunnel Reach 1 are rated as permit-required confined spaces.

D. The Pacheco Tunnel Reach 1 has a thirteen (13) foot diameter and a 9,677 foot length. While

the tunnel surface is roughly flat, it can be slippery with an assumed thin layer of biofilm and there may be the presence of debris as it carries raw water from the Sacramento Delta. From the 2007 inspection, soft sediment deposits such as dirt, sand, etc. were discovered. However, rocks, boulders, and other hard debris were not present. The sediment average depth was 0.03 inches with a maximum sediment depth of 6.2 inches.

E. The fiber optic cable that tethers the underwater ROV will likely be in contact with the edging of

the tunnel and tunnel shafts. There is the distinct possibility of friction for the cable at these contact points.

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F. The cross-section and shape does change over the length of the tunnel. There is a sharp 50o

bend several hundred feet downstream of the Gate Shaft that could possibly impede the movement of the underwater ROV.

G. Approximately 4,700 feet of Pacheco Tunnel Reach 1 was not inspected in 2007. This

uninspected section includes the following:

Structure Stationing Tunnel Elevation (Invert)

313 Lower Intake/Trash Rack Structure

102+40 313.00’

Inlet Portal 103+25 312.98’

370 Upper Intake 105+04 312.93’

Gate Shaft on Tunnel Island 125+40 312.29’

End Point of 2007 Inspection ~150+00 ~312’

H. The Pacheco Tunnel Reach 1 will be out of service during the underwater inspection. Hence,

there should be zero or close to zero flow in the tunnel. The tunnel may not be fully submerged during the course of the inspection.

I. Please reference the maps, drawings, and pictures in Appendix C, D, & E under this Scope of

Work. 3.1.2 Tunnel Access – 370 Upper Intake

A. Typically, the 370 Upper Intake structure is submerged beneath the water at San Luis Reservoir. While the reservoir is at its low point, the 370 Upper Intake will be exposed since the elevation of San Luis Reservoir will be under 370 feet, which corresponds with the bottom of the above-ground intake structure.

B. The reservoir bottom surrounding the 370 Upper Intake structure is relatively flat. An old

abandoned highway linking the boat ramps at Dinosaur Point to the 370 Upper Intake structure will be exposed during the low point.

C. Vehicles to be used shall be capable of navigating rough and rocky terrain. Vehicles can be

expected to be parked near the 370 Upper Intake structure. The abandoned highway passes within several hundred feet of the 370 Upper Intake.

D. The upstream rectangular grates (dimensions 5’ x7’) at the 370 Upper Intake would be removed

by District staff prior to commencement of the tunnel inspection. The inspection equipment can be carefully lowered down the rectangular shaft about 60 feet to the invert of the tunnel. There is a large partition at the 370 Upper Intake that divides the tunnel into two compartments.

3.1.3 Tunnel Access – Surge Structure at Pacheco Pumping Plant

A. The above-ground portion of the surge shaft is twenty (20) feet tall. From ground level to the

bottom of the shaft is approximately 250 feet. The inner diameter of the above-ground shaft is thirty (30) feet. Below ground, the inner diameter narrows to approximately fifteen (15) feet. The change in diameter provides a ledge inside the surge shaft, where personnel can stand.

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B. The surge structure is open at the top, which is the only way to insert the ROV into the shaft. There is no permanent personnel access to the opening; therefore, temporary scaffolding was necessary in 2007 and would be an option for personnel access in order to guide the insertion of the ROV.

C. The Pacheco Plant Surge Structure is accessible by Dinosaur Point Rd off of Highway 152 as

part of the enclosed Pacheco Pumping Plant. The terrain is easily navigable by conventional vehicles. Access to the Plant and surge shaft shall be granted to the Contractor and subcontractor(s) at the discretion of the District. There is adequate space around the surge shaft for staging of vehicles, tools, equipment, etc.

Please refer to Appendix E, which contains images from the 2007 sonar inspection project as well as pictures.

4.0 SCOPE OF WORK The Contractor will utilize their inspection expertise, knowledge, methodologies and technologies to complete the following tasks: 1. Review tunnel documentation, with the District, to establish a work plan and baseline analysis

parameters; 2. Coordinate and schedule tunnel inspection activities in accordance with all applicable regulatory

and District requirements; 3. Perform tunnel inspection in accordance with the established work plan; 4. Collect, assimilate, and interpret the inspection data collected; 5. Provide an inspection report with a detailed summary of the Pacheco Tunnel Reach 1, subject to

District review and approval. 4.1 DETAILED SCOPE OF WORK

Task 1 - Review Documentation

A. The Contractor, with the assistance from the District, shall obtain and review all relevant documentation (as-builts, laysheets, specifications, reports, maps, etc.), as required, to gain familiarity with scope of work, tunnel, geography, and prospective working conditions. The Contractor shall use this information to establish a work plan for completing all activities required in the Scope of Work.

Task 2 – Coordinate and Schedule Inspection

A. The Contractor, with District direction, assistance and approval, shall plan and coordinate all tunnel inspection activities in an effort to maximize project efficiencies. The Contractor shall actively participate and contribute to all applicable District-organized project planning and coordination efforts. During these efforts, specific preparation requirements will be provided once all assignments and tasks have been defined and scheduled.

B. Due to the uncertain nature of the reservoir levels and the tunnel inspection process, the

Contractor shall be prepared to update and revise said assignments and tasks should unforeseen issues arise.

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C. The Contractor shall conform to all applicable rules, requirements and regulations pertaining to

safety as specified by the District’s Employee Health & Safety Unit (EH&S) and CAL/OSHA Health and Safety regulations.

Submittals

A. Prior to tunnel inspection, the Contractor shall submit the following documents:

A list of the entire staff, including any subcontractor’s staff that will be present for the tunnel inspection. The list shall identify the roles and responsibilities for the entire staff.

A list of emergency contact information for the entire staff, including any subcontractor’s staff that will be present for the tunnel inspection.

Written documentation supporting the Contractor’s Injury and Illness Prevention Program in accordance with CAL-OSHA regulation 8 CCR 3203.

Written documentation supporting the Contractor’s Confined Space Program in accordance with CAL/OSHA regulation 8 CCR 5157.

Written documentation supporting that staff, including any subcontractor’s staff, entering confined spaces have been trained for lockout-tagout and confined space entry in accordance with CAL/OSHA regulations.

Completed forms provided in the “Contractor Safety Qualification Packet” (F640D18) or the “Annual Contractor Safety Update Packet” (F640D11). Please refer to the sample copy of the Contractor Safety Prequalification Form in Appendix F. The accompanying Prequalification Form serves as a reference only and does not have to be submitted with the Proposal.

Specific safety forms as requested by the District including the “Contractor Risk Assessment Form” (F640D03).

Work plan with methodology for completing all activities required in the Scope of Work and a description & specifications of the inspection equipment & materials to be used.

Sample of inspection report prepared for a similar inspection project.

B. All submittals shall be reviewed and accepted by the District prior to the commencement of the tunnel inspection. The District’s review of all submittals does not relieve the Contractor of being solely, fully, and completely responsible for the safety of all listed persons at the work sites.

C. Each submittal will be returned within three (3) business days following receipt. When a

submittal cannot be returned within this stated period, the District will give notice of a date when it can be returned to the Contractor. The Contractor shall make any necessary corrections and revisions to returned submittals and shall resubmit within three (3) business days after receipt.

Task 3 – Perform Inspection Tunnel Access

A. The two planned access points into the Pacheco Tunnel Reach 1 are the 370 Upper Intake and the Pacheco Plant Surge Structure. Please see Section 5.3 for more information. As referenced in Section 5.3, when the water level exposes the 370 Upper Intake, both access points will be accessible and available. Because the two access points are different types of structures, it is important to note that each access will require a unique entrance strategy and set-up.

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B. District staff shall accompany the Contractor during the tunnel inspection. This includes all tunnel activities at the 370 Upper Intake and Pacheco Plant Surge Structure. District staff will support field activities by providing information, helping to orient the Contractor staff in the field, and where necessary to start, stop and operate equipment.

C. The mobilization efforts shall include all the preparatory work and materials necessary for the

movement of personnel, equipment, supplies, and incidentals to the access points.

D. The Contractor shall be aware that the 370 Upper Intake in particular is located in a remote location not directly accessible by paved roads. Access points to the 370 Upper Intake may be difficult due to inclement weather, higher than anticipated reservoir levels, site conditions, and other contributing factors. The Contractor shall be prepared and have the resources available to complete the work within the allotted time frame. This includes any land, water, and/or underwater vehicles.

Inspection Criteria

A. The Contractor’s inspection equipment shall be capable of:

Navigating the lengths, grades, transitions, and cross-section of the tunnel,

Providing clear, stable data with minimal electrical interference,

Maintaining a speed that produces the best quality inspection data,

Supporting a range of frequencies (that could be remotely adjusted) to provide the best quality inspection data. Furthermore, it shall utilize acoustic signals to locate instances of irregularities and distress or damaged sections

B. Similar to the 2007 sonar inspection, the inspection data will be recorded on a continuous basis

of the ongoing sonar images recorded in “real time” mode. At specified intervals, a dwell (stationary) profile scan will be recorded. The dwell scans will be performed at:

50 foot intervals for the first 500 feet of inspection from the access point(s);

100 foot intervals for the inspections between 500 feet & 1,000 feet from the access point(s); and,

500 foot intervals for the inspections past 1,000 feet from the access point(s). Inspection Provisions

A. The Contractor shall provide all applicable material, labor and equipment to conduct the tunnel inspection and assess its internal conditions. This includes any tools, scaffolding, vehicles, cranes, forced air ventilation, safety gear, and other support supplies, as required. Electrical power (i.e.: portable generator) for all the inspection equipment and materials shall be furnished by the Contractor.

B. A District representative shall be present during the whole duration of the tunnel inspection.

C. Prior to commencement of the tunnel inspection, all materials and equipment that enter the

tunnel shall be cleaned and be approved by the District representative before being placed inside on the tunnel access structures.

D. After the tunnel inspection is complete, the Contractor shall check all inspection materials and

equipment for any evidence of mussel shells and report the findings to the District before leaving the work site.

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E. Upon completion of the tunnel inspection, all project work sites shall be returned to the state of cleanliness prior to the start of the tunnel inspection. Any waste, dust, debris or excess material generated during the tunnel inspection shall be removed. All parts of the work shall be left in a reasonably neat and presentable condition to the satisfaction of the District.

F. As stated in Section 6.0, the tunnel inspection shall be performed and completed in a four (4)

work day time period with a two (2) work days to perform the actual inspection and will occur sometime during a twelve (12) month window.

Task 4 – Analyze Collected Data

A. The Contractor shall organize, assimilate, and interpret all the collected inspection data. The Contractor shall be responsible for the quality, accuracy, and completeness of the inspection data and the work products produced under this Scope of Work. All estimates, calculations, evaluations and analysis shall be documented in accordance with best practice standards and guidelines for similar work and shall be subject to District review and approval.

Task 5 – Develop Inspection Report

A. The inspection report shall provide a detailed summary of the existing conditions of the tunnel. All documentation (i.e.: summaries, dwell scans, drawings, tabular lists, etc.) shall be documented in accordance with industry standards for similar work.

B. The inspection report shall be compiled in a logical, comprehensive, organized manner and present in a written report format, including an executive summary. The inspection report shall include, but is not limited to, documentation for the following inspection parameters:

The distance and stationing for the limits of the tunnel inspection shall be identified. Stationing records shall be concurrent with the current stationing, as specified in the as-builts and other documentation.

A tabular list or log including all instances of distress or damage sections shall be compiled to identify and/or illustrate tunnel condition and status. This shall include, but is not be limited to the location and extent of:

o Structural offsets, defects, discontinuity, and shape deformation; o Variations in tunnel profile; o Tuberculation and corrosion of the interior surface; o Transitions in tunnel size and shape; and o Sediment levels, obstructions, and other debris

C. An overall tunnel inspection summary shall be submitted along with the detailed inspection

results. The Contractor shall document all procedures and methodologies for all activities required under this Scope of Work including, but not limited to:

Tunnel inspection including the mobilization/demobilization, means of entry.

Data collection and processing

Data analysis

Overall project development, preparation and management

D. The Contractor shall submit a draft inspection report titled “Pacheco Tunnel Reach 1 Condition Inspection Report” no more than eight (8) weeks from the date the Contractor completes the tunnel inspection. The inspection report shall be subject to District review and approval. The inspection report will be subject to verification for accuracy, conciseness, completeness, and consistency.

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E. The final draft of the inspection report shall be delivered as three (3) hard copies, two (2)

electronic copies (CD or DVD). 4.2 SUPPLEMENTAL WORK

A. If project assumptions/criteria/constraints made at the start of work change during the course of the project, the Engineer may authorize either the extension of the time of completion, supplemental work, or changes in work only but will not be authorized to exceed the not-to-exceed amount as shown in the line item bid table in Appendix A. Supplemental work will be paid in accordance with the respective bid item for supplemental work. For the extension in the time of completion, the Contractor shall be relieved during the period of any claim for liquidated damages or other penalties and the Contractor shall have no claim for any other compensation for such an extension.

B. All Proposals shall include the amount shown in supplemental work bid item in Appendix A. Said

amount is an estimate only. The amount of expenditure may vary from zero to the total amount for this line item, but will not exceed it.

C. Supplementary work shall be paid for on a Cost of Work basis (labor, materials, tools and

equipment) or have written approval by the District.

D. Final compensation shall be based on the actual amount of supplementary work performed by the Contractor with any corresponding documentation. Full compensation may constitute the sum of several modifications.

4.3 HOURS OF WORK

A. The tunnel inspection shall be conducted during normal working hours, Monday through Friday, 8:00 am to 6:00 p.m. With the tight schedule, the District, at its sole discretion, may extend the working hours for sites outside of the public right-of-way and in private property.

4.4 LOCKOUT-TAGOUT

A. Lockout-tagout is required for this work. 4.5 TRAFFIC CONTROL

A. No traffic control is required for this work. 4.6 CONFINED SPACE ENTRY

A. Ventilation, air monitoring, and all other equipment required for confined space entry shall be furnished by the Contractor

B. Any work that the Contractor performs inside confined space shall be in accordance with the

CAL/OSHA regulation 8 CCR 5157.

C. Unless otherwise specified, Contractor shall complete documentation for all confined space entries. Said documentation shall be submitted to the District upon request.

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4.7 SAFETY

A. All Contractor staff, including any subcontractor’s staff, shall have and be trained to use all applicable personal protective equipment (i.e.: hard hats, flashlights, safety gloves, air monitors, etc.). All personal protective equipment shall be properly certified and in compliance with all applicable regulatory requirements.

4.8 PRESERVATION OF PROPERTY

A. The Contractor shall conduct the tunnel inspection with extreme care and shall take every precaution to protect the tunnel, tunnel shafts & above-ground structures, adjacent facilities, and surrounding environments throughout the execution of this Scope of Work.

B. The Contractor shall perform the tunnel inspection and maintain the work sites in a neat and

orderly fashion. The Contractor is fully responsible for any damages to SCVWD property, County of Merced property, Federal property, private property, utilities’ property, and any other neighboring properties to the work sites. The Contractor shall repair or replace in kind, as directed by the District, any damages resulting from the tunnel inspection. Contractor is fully responsible for loss or damage to their stored materials and equipment.

4.9 STORAGE/STAGING

A. The Contractor shall be responsible for arranging any temporary enclosure, storage, and/or staging of the materials, tools, and equipment. Contractor shall be responsible for any of its loss or damage. Storage and staging at Pacheco Pumping Plant and San Luis Reservoir is subject to District review and approval.

4.10 SCHEDULE OF COMPLETION

A. The Contractor shall complete all activities required under this Scope of Work. Furthermore, the inspection cannot occur until all activities as required under Task 1 and Task 2 have been completed.

B. The Pacheco Tunnel Reach 1 can only be inspected when the water levels at San Luis

Reservoir are at a low level. This is expected to occur sometime during the next twelve (12) months from the Notice to Proceed. The District anticipates issuing a notice to proceed in September 2015, with work starting in October 2015, based on current water level projections.

C. The District will give the Contractor ten (10) calendar days notice of when low reservoir levels

are expected and the tunnel inspection can occur.

D. The District will provide verbal and email confirmation seven (7) calendar days before Pacheco Tunnel Reach 1 is ready and available for inspection.

E. To limit potential impacts to the District’s water supply system, the tunnel inspection will be

performed and completed in a two (2) work day time period as directed by the District

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BID ITEMS

Line Item No.

Description Estimated Quantity

Unit Price Total Price

1 Task 1 – Review Documentation Lump Sum NA

2 Task 2 – Coordinate and Schedule Inspection

Lump Sum NA

3 Task 3 – Perform Underwater ROV Inspection

Lump Sum NA

4 Task 4 – Analyze Collected Data Lump Sum NA

5 Task 5 – Develop Inspection Report Lump Sum NA

6 Supplementary Work - Miscellaneous Lump Sum NA $1,500.00

TOTAL SUM BID

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MAPS

Source: Bing.com Maps Source: Available access points are Surge Structure-Pacheco & 370 Upper Intake

Gate Shaft (Tunnel Island)

Dinosaur Point Boat Ramp

313 Lower Intake (approx.)

370 Upper Intake (approx.)

Surge Structure-Pacheco

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Source: Bing.com Maps

Dinosaur Point Boat Ramp

Surge Structure-Pacheco

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PICTURES

Pacheco Pumping Plant Site (Taken 7-01-2014)

Pacheco Plant Surge Structure (Taken 7-01-2014)

Surge Shaft Structure

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2007 Surge Shaft access strategy and set-up (2007 Inspection Report)

2007 Personnel on interior shelf of the Surge Structure

(2007 Inspection Report)

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Tunnel Island from top of Dinosaur Pt boat ramp (Taken 7-01-2014)

Tunnel Island & the Bottom of Dinosaur Pt Boat Ramp (Taken 6-28-2007)

Abandoned

Highway

Construction

Road

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Approximate location of 370 Upper Intake at the base of Tunnel Island. (Taken 7-01-2014)

Aerial of the 370 Intake (Taken 8-12-2008)

370 Intake

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370 Intake (Taken 8-26-2008)

370 Intake (Taken 8-19-2008)

370 Intake

370 Intake

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Grating at 370 Intake (Taken 9-12-2008)

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Interior of 370 Intake (Taken 9-12-2008)

Edge of Grating