Program Formulation Summary

Willamette Water Supply Program

Program Formulation Summary Executive Summary

October 31, 2018

October 31, 2018 Program Formulation Summary Executive Summary

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October 31, 2018 Page ii Program Formulation Summary Executive Summary

Contents Executive Summary............................................................................................................................. 1

Introduction .................................................................................................................................... 1

Planning Considerations ................................................................................................................. 2

Alternatives Development and Evaluations ................................................................................... 3

Raw Water Facilities ................................................................................................................... 4

Pipelines ...................................................................................................................................... 4

Water Treatment Plant ............................................................................................................... 6

Reservoir ..................................................................................................................................... 7

Willamette Water Supply System Description and Status ............................................................. 8

List of Tables Table ES-0-1 Criteria Considered for Supply Source Evaluation .................................................. 3

Table ES-0-2 Willamette Water Supply System Schedule as of July 2018 ................................... 9

List of Figures Figure ES-0-1 Willamette Water Supply Program Annual and Cumulative Costs ....................... 10

Figure ES-0-2 Willamette Water Supply System Work Packages ................................................ 11

October 31, 2018 Page iii Program Formulation Summary Executive Summary

List of Abbreviations and Acronyms Beaverton City of Beaverton

cfs cubic feet per second

CM/GC Construction Manager/General Contractor

DSL Oregon Department of State Lands

Hillsboro City of Hillsboro

MG million gallons

MGD million gallons per day

ODOT Oregon Department of Transportation

OHA Oregon Health Authority

Partners Tualatin Valley Water District and the cities of Hillsboro, Beaverton, Wilsonville, Sherwood, and Tigard

PFS Program Formulation Summary

PLE eastern extension of the Willamette Water Supply System pipelines

PLM main stem of the Willamette Water Supply System pipelines

PLW western extension of the Willamette Water Supply System pipelines

PLE_1.0 Beaverton Area Pipeline Project

PLM_1.0 Wilsonville Area Pipeline Project

PLM_1.1 Wilsonville Road

PLM_1.2 Garden Acres Road to 124th

PLM_1.3 Wilsonville Rd to Garden Acres

PLM_2.0 Kinsman Road Partnership Project

PLM_3.0 124th Avenue Partnership Project

PLM_4.0 Tualatin-Sherwood Area Pipeline

PLM_4.1 Highway 99 Crossing

PLM_4.2 Tualatin-Sherwood Road

PLM_4.3 Roy Rogers Road

PLM_5.0 Scholls Area Pipeline Project

PLM_5.1 North of Beef Bend to Scholls

PLM_5.2 Scholls to Grabhorn Rd

PLM_5.3 Grabhorn Rd at Tile Flat to Farmington

PLW_1.0 South Hillsboro Area Pipeline Project

October 31, 2018 Page iv Program Formulation Summary Executive Summary

PLW_1.1 Blanton to TV Hwy

PLW_1.2 TV Hwy to Frances

PLW_1.3 Farmington to Blanton

PLW_2.0 Cornelius Pass Pipeline Project

Project Participants Tualatin Valley Water District and the City of Hillsboro

ROW right of way

RWF_1.0 Raw Water Facilities

SW Southwest

Tigard City of Tigard

TVWD Tualatin Valley Water District

UGB urban growth boundary

USACE U.S. Army Corps of Engineers

UV ultraviolet

WCSL Washington County Supply Line

WIF Willamette Intake Facilities

Wilsonville City of Wilsonville

WRWTP Willamette River Water Treatment Plant

WTP Water Treatment Plant

WWSP Willamette Water Supply Program

WWSS Willamette Water Supply System

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October 31, 2018 Page 1 Program Formulation Summary Executive Summary

Executive Summary Tualatin Valley Water District (TVWD) and the City of Hillsboro, collectively referred to as the Project Participants, have identified the Willamette Water Supply System (WWSS) as the best option for future delivery of drinking water to their service areas in Washington County. The Project Participants are leading the Willamette Water Supply Program (WWSP) to develop the WWSS. The mid-Willamette River at the City of Wilsonville (Wilsonville) will be the water supply source for the WWSS. Developing an additional water supply through a partnership supports the region’s plans for responsible growth within the Urban Growth Boundary (UGB).

The WWSS will include more than 30 miles of water transmission pipelines ranging in diameter from 36 inches to 66 inches from the raw water facilities in Wilsonville north to Hillsboro and the Tualatin Valley Water District service areas. The WWSP also includes constructing two finished-water storage tanks (terminal storage), constructing a new water treatment plant (WTP), and expanding the raw water facilities, including replacing the fish screens and seismic improvements at the existing intake facility on the Willamette River. The WWSS will provide the Project Participants and the region with a seismically resilient water supply to meet future water demands and provide redundancy in case of a future emergency event. Other municipalities or water agencies may join the Project Participants in the future for implementing the WWSP, or for emergency interconnections. Currently, the City of Beaverton (Beaverton) is considering joining the WWSP, and the City of Tigard is planning to have an emergency intertie.

Introduction

This Program Formulation Summary (PFS) was prepared as the next step to the overall master planning efforts recently completed or under way by the Project Participants. The PFS documents the description of the WWSS, including WWSP actions and permitted facilities, and rationale that led to selection of the WWSP facilities and actions. This document was prepared to be consistent with the alternatives analysis following the Clean Water Act, Section 404(b)(1) guidelines and Oregon Health Authority (OHA) approved facility plans. The level of detail reflects the design progress for each facility, as many facilities are still in the preliminary design phase.

This PFS provides common definition and understanding of what will be constructed and implemented for the WWSS in easily understandable, straightforward language that describes the current WWSS configuration and rationale. This document does not contain technical details describing various decisions, but conveys information at a higher level than the engineering design, reports, and permit application details for the WWSS. This PFS summarizes various documents that contain more detailed technical and permitting information and summarizes the latest configurations, completed designs, and outcomes of decisions as part of the following processes and associated documents:

• Conveyance and Storage Preliminary Design and Value Engineering • Willamette River Water Treatment Plant (WRWTP) Master Plan (2016 Update)


• Reservoir Site Selection • WTP Site Selection • Opportunity Project Evaluations and Detailed Designs • Water Supply Planning and Water Rights • Permitting Strategy and Alternatives Analysis

Planning Considerations

The Project Participants are developing the WWSS to be a resilient and reliable water source for future population and economic growth and for seismic risk, as well as other regional conditions. The Project Participants’ collective service area is located in Washington County, the second most populous county in Oregon. Together, the Project Participants serve a population of approximately 300,000; TVWD alone has the second-largest drinking water customer base in the state. Washington County is also home to many commercial and industrial facilities that are key to growing and sustaining the health of Oregon’s economy; a reliable and resilient water supply is foundational to maintaining the economic vitality of Washington County. It is within this regional setting the Project Participants defined the purpose of the WWSS. The purpose of the WWSS is to provide a long-term water supply option to serve the projected water supply needs of the TVWD and Hillsboro residents and businesses.

To achieve the purpose of the WWSS, the chosen water supply option must meet the following needs:

• Meet projected future water demands, supporting the region’s plans for responsible growth within the UGB

• Reliably deliver water, including in times of droughts, earthquakes, or other disasters • Supply finished quality water to TVWD and Hillsboro customers • Be cost-effective and placed in service by July 2026 • Support ownership and control of the water supply via a partnership between TVWD

and Hillsboro

A summary of the criteria identified by Hillsboro and TVWD in their independent supply source evaluations is presented in Table ES-0-1.


Table ES-0-1 Criteria Considered for Supply Source Evaluation City of Hillsboro Criteria Tualatin Valley Water District Criteria Cost Demand Uncertainty1

Reliability Source Reliability Redundancy Source Redundacy Implementation Risk Implementation Risk Operational Complexity2 Public Acceptance Responsiveness to Demand Growth Community Impacts Source Water Quality Metzger Fluoridation3

Treated Water Quality Finished Water Quality Environmental Impacts Sustainability Ownership Governance

Notes: 1Ability of the supply to provide additional capacity if demands are greater than projected and accommodate demands less than forecast through phasing and/or scaling improvements. 2Potential level of difficulty in running a water supply and treatment system that maintains the City of Hillsboro’s current high level of service quality. 3Ability to continue non-fluoridated supply to Metzger Service Area.

Alternatives Development and Evaluations

The Project Participants evaluated a number of potential water supply alternatives, identifying constraints and planning criteria for consideration when selecting a water supply source. While some planning constraints or criteria are more rigid than others (i.e., current applicable laws, regulations, policies, and physical conditions), others may be less restrictive, but still influential in selecting and defining WWSS alternatives. Some examples of WWSS planning constraints and criteria are:

• Alternatives should address, at a minimum, the defined purpose and needs. • Alternatives should consider issues raised in coordination with federal, state, and local

agencies. • Alternatives should not result in a substantial adverse effect to existing and future

water supplies. • Alternatives should either avoid potential adverse effects to recreational/community

resources or include features to mitigate significant impacts, when feasible. • Alternatives should have a high certainty for achieving intended benefits and not

depend on long-term actions (past the initial construction period) for success.

These planning constraints/criteria were applied to evaluate the supply source alternatives. The Project Participants ultimately identified the mid-Willamette River as the water supply option that best aligns with the WWSS purpose and needs of the region.

The Project Participants conducted numerous studies and reports investigating the various alternatives for implementing the WWSS, including: pipeline routes and alignments; reservoir siting; WTP features, processes, and siting; and intake expansion sizes and physical configurations. Screening and evaluation criteria based on planning considerations were used to shortlist preferred alternatives and approaches. Preliminary design efforts further developed WWSP critical path needs, cost estimates, and project scheduling.


The following sections summarize the alternatives evaluation process for facilities and pipelines from south to north, including the raw water facilities, pipelines, WTP, and Reservoir.

Raw Water Facilities

The current permitted withdrawal capacity at the existing Willamette Intake Facilities (WIF) is 70 million gallons per day (MGD) (108 cubic feet per second (cfs)). The intake diverts raw water from the Willamette River into the raw water pump station caisson via a 76-inch diameter pipeline that extends into the river from beneath the riverbank. Raw water flows by gravity to the caisson, which serves as a wet-well for the vertical turbine raw water pumps. Two 66-inch diameter, stainless steel cylindrical tee screens were installed approximately 80-100 feet from the river’s edge on the intake pipeline to prevent debris and fish from being drawn into the caisson. The screen system was designed and approved according to the Oregon Department of Fish and Wildlife and National Marine Fisheries Service standards to meet the Endangered Species Act requirements for anadromous fish protection. Because the Willamette River is a navigable water of the U.S., in-river construction work requires a Federal Clean Water Act/Rivers and Harbors Act permit through the U.S. Army Corps of Engineers (USACE), in addition to approval by the Oregon Department of State Lands (DSL). The existing intake system was permitted in February 2000 through a joint USACE-DSL authorization and a separate USACE authorization in September 2000.

The current planned intake capacity is 150 MGD (278 cfs). Based on results of the technical evaluation, the planned intake expansion could be accomplished by replacing the existing 66-inch diameter screens with larger diameter screens. This could occur similar to maintenance activities using a barge, crane, and divers to remove the existing tee screens (unbolting the screens from the 54-inch diameter outlet flanges) and installing the new/larger screens on the same flanges. This work would be conducted during low water and low-flow conditions in the late summer or early fall and coincide with the in-water work period. The existing raw water pump station at the WIF will accommodate the increased intake capacity by replacing the existing pumps with larger pumps and adding more pumps. Seismic and structural vulnerabilities will be addressed through mitigation at the top and toe of the riverbank.

Pipelines

The WWSS pipelines include the main stem, western extension, and eastern extension (PLM, PLW, and PLE, respectively). The pipelines are divided into individual work packages (some with sub-work packages). The work packages are numbered from south to north and currently include the following (names and numbering may change as the WWSP progresses through design and construction):

• PLM_1.0: Wilsonville Area Pipeline Project. PLM_1.0 includes three sub-work packages: Wilsonville Road (PLM_1.1), Garden Acres Road to 124th (PLM_1.2), and Wilsonville Rd to Garden Acres (PLM_1.3)

• PLM_2.0: Kinsman Road Partnership Project. PLM_2.0 does not include sub-work packages.


• PLM_3.0: 124th Avenue Partnership Project. PLM_3.0 does not include sub-work packages.

• PLM_4.0: Tualatin-Sherwood Area Pipeline. PLM_4.0 includes three sub-work packages: Highway 99 Crossing (PLM_4.1), Tualatin-Sherwood Road (PLM_4.2), and Roy Rogers Road (PLM_4.3).

• PLM_5.0: Scholls Area Pipeline Project. PLM_5.0 includes three sub-work packages: North of Beef Bend to Scholls (PLM_5.1), Scholls to Grabhorn Rd (PLM_5.2), and Grabhorn Rd at Tile Flat to Farmington (PLM_5.3).

• PLW_1.0: South Hillsboro Area Pipeline Project. PLW_1.0 includes three sub-work packages: Blanton to TV Hwy (PLW_1.1), TV Hwy to Frances (PLW_1.2), and Farmington to Blanton (PLW_1.3).

• PLW_2.0: Cornelius Pass Pipeline Project. PLW_2.0 does not include sub-work packages.

• PLE_1.0: Beaverton Area Pipeline Project. PLE_1.0 does not include sub-work packages.

Prior to identifying individual pipeline project work packages, alternative routes were divided into four sections based on known fixed points of the WWSS. These points were based on connections to other existing and WWSS-related infrastructure, such as water source and treatment, existing water distribution systems, early opportunities to team with other agencies’ projects, and other components such as finished water storage.

Matrices were developed to present ratings for each pipeline route based on mapping, site visits, and agency feedback meetings performed during the routing study. Following the initial evaluation process, a more detailed investigation of potential routes was conducted. The preferred pipeline alignment was determined by applying knowledge of utilities, existing obstructions (e.g., retaining walls, culverts, or bridges), future roadway projects, and other considerations.

A unique aspect of the WWSP is the option of teaming or coordinating with other agencies – primarily Washington County, the Oregon Department of Transportation (ODOT), local municipalities, and private land developers – on projects that will coincide with constructing the WWSS pipelines (called opportunity projects). Opportunity projects have several advantages, including reducing environmental and community impacts, and providing potential cost savings.

WWSP staff meet with the agencies planning these opportunity projects to assess the timing of projects and coordinate scheduling with WWSP projects. The WWSP developed a business case analysis process to critically evaluate each opportunity project on a case-by-case basis to support pursuing or foregoing each potential opportunity.

During preliminary pipeline design, WWSP staff identified 27 separate partnering opportunities. Many of these opportunity projects ultimately fell outside of the preferred route and are no longer viable. As of July 2018, the Project Participants are constructing or have completed construction on three of the previously identified opportunity projects (PLM_2.0, PLM_3.0, and PLW_1.1) and are actively coordinating on opportunities for PLM_1.1, PLM_1.2, PLM_4.1,


PLM_4.2, PLM_5.1, PLM_5.2, and PLW_1.2. The Project Participants continue to work with the relevant agencies to investigate other potential opportunity projects.

Water Treatment Plant

Initial water treatment alternatives included variations on expanding facilities at the existing WRWTP in Wilsonville. As planning progressed, the Project Participants identified several constraints with expanding the WRWTP and recognized potential benefits of other optional sites in Washington County, including:

• Additional seismic stability/resiliency • Fewer environmental and construction-related impacts to Arrowhead Creek • Fewer construction and operational impacts to adjacent neighbors • Easier maintenance of finished water quality due to shorter length of the finished water

pipeline • A less confined site for treatment plant components and future expansions

Considering these potential benefits, the Project Participants conducted a high-level screening of potential alternative WTP sites. The Project Participants identified the following key parameters:

• A minimum of 10 acres was used to initially identify and screen sites, as it provides the minimum area needed for WTP infrastructure. The absolute minimum space depends on site-specific configurations (e.g., parcel shape and topography) and constraints (e.g., setbacks).

• The property owner(s) expressed an interest in selling either to the public (property was listed for sale at the time of screening) or directly to the WWSP or Project Participants.

• Only sites immediately adjacent or in close proximity to the WWSS pipeline alignment were considered. Proximity to existing or anticipated roads of sufficient size to accommodate construction vehicles to and from the site was also considered.

The screening identified four alternative sites that met these parameters, including the WRWTP and three alternative sites located in Washington County. Site explorations were then conducted on the four sites to support a criteria-based evaluation and comparison among the sites to determine the preferred WTP site. Where relevant, site explorations included on-site field investigations where rights-of-entry were obtained and desktop analyses were conducted using off-site methods and existing, readily available information. The WTP criteria evaluation identified the current preferred site, located in Washington County on Southwest (SW) 124th Avenue near SW Tualatin-Sherwood Road, as the preferred water treatment plant site. The Project Participants anticipate annexing the site into Sherwood prior to construction.

The initial selection of water treatment processes for the WTP was based on providing effective and reliable treatment of Willamette River water under a wide-range of water quality conditions. This selection will provide higher quality finished water than required by state and federal drinking water regulations. The WTP will include flash mixing, high-rate ballasted flocculation/clarification, intermediate ozonation, filtration with a deep bed of granular


activated carbon, disinfection with ultraviolet (UV) light and free chlorine, waste wash-water recovery, and mechanical solids dewatering facilities.

Reservoir

The key evaluations and analyses for the reservoir sites included storage volume and hydraulic grade line to meet WWSP level of service (LOS) requirements; site screening and evaluation criteria to identify candidate sites and ultimately select a preferred reservoir site; and value analysis and communications to support short-listing of the preferred sites. For the purpose of the WWSP, the components of storage addressed:

1) Operational storage to provide water to meet peak demands, thus limiting changes to the WWSS WTP production rate during the course of a day

2) Emergency storage to meet emergency scenarios related to the Willamette supply system; considered separate from in-town emergency storage already identified for the water distribution system storage identified in the previous component

3) Water distribution system storage to meet in-town storage needs for the individual Project Participants; can be used to meet fire suppression or emergency storage needs defined by individual in-town storage criteria

A total storage volume of 30 million gallons (MG) was selected, as this will meet a range of operational and water distribution system storage volume projections. The 30 MG will include two independent tanks to allow individual tanks to be taken offline for maintenance while still providing operational storage.

The reservoir site elevation range was determined based on the hydraulic grade line to meet WWSP LOS requirements. A minimum ground elevation of 470 feet (assuming a reservoir hydraulic grade line of 30 feet higher at a minimum of 500 feet) was selected. A 550 foot maximum ground surface elevation was selected to limit the amount of additional pumping needed to transport water to the reservoir site from the WTP.

Potential sites were identified using a minimum ground elevation and parcel size derived from the volume and hydraulic criteria decisions. A desktop analysis was used to identify potential sites applying a preferred ground elevation range of 470 to 550 feet and minimum parcel size of 4 acres. This ground elevation range was chosen so the Project Participants’ service areas could receive water by gravity-fed pressure, which will reduce operational costs associated with pumping water from the supply reservoir. The 550 foot maximum ground surface elevation was selected to focus on sites that will not require additional pumping from the treatment plant. The 4-acre area was based on an assumed circular tank with a 30 foot high water column and buffer zones.

Candidate sites that met the minimum ground elevation and parcel size were carried forward for further evaluation in a two-step evaluation process. The first step was conducted during preliminary design and identified three potential reservoir sites on the western side of Cooper Mountain for further evaluation. This evaluation step considered potential impacts and technical viability of the sites and a review of preliminary title reports of the associated parcels. The evaluation identified three sites for further analysis: sites 2, 3, and 11.


The second step refined the evaluation criteria and incorporated additional studies, including desktop analyses, discussions with the landowner(s), and, where rights of entry could be obtained, information from field reconnaissance (e.g., geotechnical and environmental investigations). The reservoir criteria evaluation identified Site 3 as the preferred site due mainly to its ground surface elevation and subsurface conditions.

Willamette Water Supply System Description and Status

The alternatives development and evaluation described above led to the current configuration of the WWSS, as summarized below. The information provided here represents the current baseline description of the WWSS. Minor refinements to this configuration are anticipated as planning, permitting, design, and construction progress.

To facilitate completion of the WWSS and delivery of water by July 2026, the Project Participants divided the WWSS into individual project work packages, as previously described. By establishing reasonably sized work packages, each project can be assigned a project manager who is responsible for delivering the project in accordance with the established schedule and budget. In some instances, a work package is subdivided into multiple packages (phases). The work packages are then prioritized for implementation, as shown in Figure ES-0-2.

The WWSP schedule and budget are updated regularly. The anticipated timeline for each work package, as of July 2018, is shown in Table ES-0-2. As of July 2018, the Project Participants are constructing or have completed construction of three projects (PLM_2.0, PLM_3.0, and PLW_1.1) with six more in design (the Raw Water Facilities project (RWF_1.0), PLM_1.0, PLM_4.0, PLM_5.0, PLW_1.0, and PLE_1.0).

An alternatives analysis for the eastern extension (PLE_1.0) was included in the WWSP’s preliminary design project, and one of the major assumptions of the need for the pipeline was to serve both TVWD and the City of Beaverton. Prior to the alternatives analysis, the 2015 TVWD Water Master Plan had recommended a connection from the WWSS to TVWD at SW Beaverton Hillsdale Highway & SW Western Avenue. In addition, the Metzger Pipeline East, a 20,750-feet long 30-inch diameter pipeline in SW Scholls Ferry Road from SW Roy Rogers Road to the intersection of SW Oleson Road and SW Hall Boulevard was included in the 2015 TVWD Water Master Plan as a TVWD capital improvement project that would be constructed in the future to serve water from the WWSS to the Metzger area. Once Beaverton dropped out of participation in the eastern extension component of the WWSS, TVWD initiated a re-evaluation of the alternatives analysis for routing the eastern extension. This additional study of the PLE_1.0 route began in November 2017.

The alternatives analysis evaluated opportunities to reduce cost, reduce risk, combine use with the Metzger Pipeline East, reduce environmental impacts, or provide operational or other advantages. The results of the alternatives analysis and TVWD’s separate hydraulic analysis were presented to the TVWD Board of Commissioners (TVWD Board) in June 2018. The TVWD Board formally endorsed designing and constructing the Metzger Pipeline East to also serve Metzger by 2026. This alternative includes the following modifications:

• Increase the diameter of PLW_2.0 slightly,


• Eliminate the eastern extension, and • Increase the diameter of TVWD’s Metzger Pipeline East project slightly, construct it on

the same schedule as the rest of the WWSS to be online by 2026, and extend it to both TVWD’s Metzger System at SW Oleson Road & SW Hall Boulevard, and to TVWD’s Wolf Creek system at SW Beaverton-Hillsdale Highway & SW Western Avenue.

With this endorsement, WWSP initiated further study of the Metzger Pipeline East route along SW Scholls Ferry Road. If early WWSP design efforts on this alternative support the findings of the alternatives analysis, the Metzger Pipeline East (MPE_1.0) route will replace the current PLE_1.0 route described in this document. This new route would require additional regulatory approvals.

The cumulative costs of implementing the WWSP, with a portion of those costs allocated to each Project Participant, are shown in Figure ES-0-1. Approximately $6.5 million of the total cumulative cost of WWSP implementation is currently allocated to other WIF Partners (in addition to the Project Participants, the WIF Partners include the cities of Beaverton, Wilsonville, Sherwood, and Tigard); the cost allocations among the other WIF Partners is not shown in Figure ES-0-1, as it is relatively small (less than one percent) compared with the current costs allocated to the Project Participants.

Table ES-0-2 Willamette Water Supply System Schedule as of July 2018

Project Project Start1

Project Complete2

RWF_1.0 – Raw Water Facilities Sep 2017 Dec 2024 PLM_1.0 – Wilsonville Area Pipeline Project May 2017 Jun 2022 PLM_2.0 – Kinsman Road Partnership Project Aug 2015 Sep 2018 PLM_3.0 – 124th Avenue Partnership Project Jan 2014 Mar 2019 PLM_4.0 – Tualatin-Sherwood Area Pipeline Project Jun 2016 Nov 2023 PLM_5.0 – Scholls Area Pipeline Project Oct 2016 Sep 2024 PLW_1.0 – South Hillsboro Area Pipeline Project May 2016 Mar 2022 PLW_2.0 – Cornelius Pass Pipeline Project Jul 2019 Oct 2023 PLE_ 1.0 – Beaverton Area Pipeline Project Nov 2017 Oct 2023 WTP_1.0 – Willamette Water Supply System Water Treatment Plant Aug 2018 Mar 2026 RES_1.0 – South Beaverton Area Water Storage Tanks Apr 2020 Dec 2024 DCS_1.0 – Distributed Control System Oct 2018 Mar 2026

Key: Apr = April Aug = August Dec = December Feb = February Jan = January Jul = July Jun = June Mar = March Nov = November Oct = October Sep = September Notes: 1 Start dates reflect the date the design consultant was or is anticipated to be issued Notice to Proceed. All future dates are subject to change. 2 Complete dates reflect the anticipated date of final acceptance, not including the warranty period. All future dates are subject to change.


Figure ES-0-1 Willamette Water Supply Program Annual and Cumulative Costs

Key: COH = City of Hillsboro FY = Fiscal Year (from July 1 of the preceding year through June 30)

TVWD = Tualatin Valley Water District WWSP = Willamette Water Supply Program Note: Cumulative costs include approximately $6.5 million currently allocated to other Willamette Intake Facility Partners (less than one percent of the total cumulative costs).

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Figure ES-0-2 Willamette Water Supply System Work Packages

Note: Start dates reflect the date the design consultant was or is anticipated to be issued Notice to Proceed. Complete dates reflect the anticipated date of final acceptance, not including the warranty period. All future dates are subject to change. The information provided here represents the current baseline description of the Willamette Water Supply System. Minor refinements to this configuration are anticipated as planning, permitting, design, and construction progress.

Documents

Program Formulation Summary