HomeMy WebLinkAboutAgenda Item - 2020-05-19 - Number 7.1 - Resolution 20-15 Wastewater Master Plan Amendment 7.1
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Subject: Resolution 20-15, 2019 Amendment to the 2013 Wastewater Master Plan
Meeting Date: May 19, 2020 Staff Member: Stefan Broadus, P.E.
Department: Engineering
Action Required Advisory Board/Commission Recommendation
❑ Motion ❑ Approval
❑ Public Hearing ❑ Denial
❑ Ordinance ❑ None Forwarded
❑X Resolution ❑X Not Applicable
❑ Information Only Comments:
❑ Council Direction
❑ Consent Agenda
Staff Recommendation: Adopt the 2019 Amendment to the 2013 Update of the Wastewater
Master Plan
Recommended Language for Motion: Move to adopt Resolution 20-15.
Project/ Issue Relates To:
❑X Council Goals/Priorities ❑X Adopted Master Plan(s) ❑Not Applicable
BACKGROUND
In November 2012, by Resolution 12-64, Council adopted the March 2013 Wastewater
Collection System Master Plan Update (2013 WWMP). The 2013 WWMP updated the previous
1989 Sewer System Master Plan, which was an extension of the City's 1968 Sanitary Sewer
Study.
During recent cost estimating work for the Engineering Department's latest Capital
Improvement Plan (CIP), the Engineering staff found some discrepancies between sewer pipe
age and size assumptions made during development of the 2013 WWMP, and the actually
existent sewer pipe ages and sizes. The Engineering staff believed that if the actual sewer pipe
ages and sizes were used in development of recommended 2013 WWMP CIP components, the
analysis could have resulted in different CIP recommendations. Engineering staff, therefore,
503.635.0215 380 A Avenue PO BOX 369 Lake Oswego, OR 97034 www.lakeoswego.city
Page 2
engaged Carollo Engineers (same consultant that produced the 2013 WWMP) to reevaluate the
portions of the 2013 WWMP having the discrepancies.
DISCUSSION
Discrepancies were found in the sewer pipe ages and sizes presumed, and actually existent, in
five separate reaches (CIP components). Those five reaches are Downtown Trunks, River Front
Trunks, Blue Heron 1, Blue Heron 2, and Forest Highlands.
The City's Engineering staff provided the actually existent sewer pipe ages and sizes for these
five reaches to Carollo Engineers. Using the actual asset data, Carollo Engineers updated the
hydraulic model used for the Master Plan Update; and, revised their CIP recommendations
accordingly. Carollo Engineers provided the result to the City in a report entitled 2019
Amendment to the Wastewater Master Plan Update, March 2013, Amended December 2019,
Revised February 2020, FINAL (2019 Amendment).
Generally, regarding existent sewer assets, the 2013 WWMP recommended either repair or
improvement. Repair is recommended for sewers that are of adequate size but are reaching
the end of their useful life due to age or deterioration. Improvement is recommended for
sewers that are not of adequate size to convey the projected wastewater flow. Conclusions
reached during development of the 2019 Amendment, resulted in some reaches no longer
being recommended for either repair or improvement (River Front Trunks and Forest
Highlands), and some reaches changing from improvement to repair (Blue Heron 2). Approval
and acceptance of the 2019 Amendment will result in the document becoming an attachment
to the 2013 WWMP and discoverable by all users of the plan.
FISCAL NOTE
The modifications found in the 2019 update have the following impact on the estimated costs
of these CIP components:
Estimated Cost: Estimated Cost:
Reach 2013 WWMP 2019 Amendment Difference
Downtown Trunks $123,000 $243,000 $120,000
River Front Trunks $391,000 $- $(391,000)
Blue Heron 1 $875,000 $1,047,000 $172,000
Blue Heron 2 $1,363,000 $1,005,000 $(358,000)
Forest Highlands $17,000 $- [ $(17,000)
Total $2,769,000 $2,295,000 $(474,000)
RECOMMENDATION
Move to adopt Resolution 20-15.
ATTACHMENT
1. Resolution 20-15, with Exhibit A
503.635.0215 380 A Avenue PO BOX 369 Lake Oswego, OR 97034 www.lakeoswego.city
ATTACHMENT 1
RESOLUTION 20-15
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF LAKE OSWEGO ADOPTING AN AMENDMENT
TO THE WASTEWATER MASTER PLAN
WHEREAS, the City adopted the Wastewater Update via Resolution 12-64 on November 27,
2012; and
WHEREAS, the Wastewater Master Plan, is a vital tool for determining future capital
improvement projects and for managing and operating the wastewater infrastructure system;
and
WEHEREAS, from time to time, changes occur in the field, or staff finds more information upon
specific research, then more detail is needed to further determine the specifics of an identified
project; and
WHEREAS, the City entered into a personal services contract with Carollo Engineers, Inc. in
2019 to evaluate a few key proposed projects from the Wastewater Master Plan to further
analyze several projects based on updated information and changes made in the field; and
WHEREAS, the resulting document provides an amendment to the Wastewater Master Plan's
previously identified projects, eliminating some projects and modifying the details of others,
while resulting in little net difference in total costs for improvements; and
WHEREAS, staff has reviewed the 2019 Amendment to the WWMP Update (as attached in
Exhibit A), and has determined this information is accurate to the best of their knowledge and
understanding of the field situation.
NOW,THEREFORE, BE IT RESOLVED by the City Council of the City of Lake Oswego that:
Section 1. The 2019 amendment to the 2013 Wastewater Master Plan Update is hereby adopted
in the form attached as Exhibit A.
Section 2. Effective Date. This Resolution shall take effect upon passage.
Considered and enacted at the regular meeting of the City Council of the City of Lake Oswego on the
19th day of May, 2020
AYES:
NOES:
Resolution 20-15
Page 1 of 2
EXCUSED:
ABSTAIN:
Kent Studebaker, Mayor
ATTEST:
Anne-Marie Simpson, City Recorder
APPROVED AS TO FORM:
David D. Powell, City Attorney
Resolution 20-15
Page 2 of 2
Exhibit A to Resolution 20-15
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2019 Amendment to the
Wastewater Master Plan
MARCH 2013
AmendedDECEMBER 2019
RevisedFEBRUARY 2020
FINAL
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2019 AMENDMENT TO THE
WASTEWATER MASTER PLAN UPDATE
March 2013,
FINAL I Amended December 2019,
Revised February 2020
Digitally signed by Harold W.Gresh
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Date: 02 370800'
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EXPIRES:06/30/21
2019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Contents
EXECUTIVE SUMMARY ES-1
ES.1 Introduction ES-1
ES.2 Policies and Criteria ES-1
ES.3 Existing System and Condition Assessment ES-1
ES.4 Policies and Criteria ES-4
ES.5 Hydraulic Model Development ES-4
ES.6 Peak Flow Estimations ES-4
ES.7 Inflow and Infiltration Reduction Program ES-4
ES.8 Capacity Evaluation ES-4
ES.9 Capital Improvements Plan ES-6
ES.10 Summary ES-6
CHAPTER 1 - INTRODUCTION 1-1
1.1 Introduction 1-1
1.2 Objective 1-1
1.3 Background 1-1
1.4 Report Organization 1-1
1.5 Acknowledgments 1-2
1.6 Abbreviations 1-2
CHAPTER 2 - BASIS OF PLANNING 2-1
CHAPTER 3 - FLOW PROJECTIONS 3-1
CHAPTER 4 - EXISTING SYSTEM 4-1
4.2 Pipes 4-1
4.2.1 Major Collectors Condition Assessment 4-7
4.6 Repair Program Summary 4-7
CHAPTER 5 - HYDRAULIC MODEL DEVELOPMENT 5-1
5.1 Introduction 5-1
5.2 Model Update 5-1
5.3 Model Calibration 5-2
CHAPTER 6 - CAPACITY EVALUATION 6-1
6.1 Introduction 6-1
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE
6.2 Performance Criteria 6-1
6.2.1 Design Storm 6-1
6.2.2 Pump Stations 6-2
6.2.3 Conveyance System 6-2
6.4 Collection System Capacity Evaluation 6-2
6.4.1 Identified Deficiencies 6-3
6.4.2 Recommended Pipeline Improvements 6-7
6.7 Summary of Recommended Improvements 6-10
6.7.1 Improvement Program 6-10
6.7.2 Expansion Program 6-10
CHAPTER 7 - INFLOW AND INFILTRATION REDUCTION PROGRAM 7-1
CHAPTER 8 - CAPITAL IMPROVEMENT PLAN 8-1
8.1 Introduction 8-1
8.2 Cost Estimating Assumptions 8-2
8.2.1 Pipeline Unit Cost 8-3
8.3 Repair Program 8-3
8.3.1 Pipeline Repair Projects 8-9
8.3.2 Pump Stations Repair Projects 8-11
8.4 Improvement Program 8-11
8.4.1 General Improvement Projects 8-11
8.4.2 Pipeline Improvement Projects 8-11
8.4.3 Pump Station Improvement Projects 8-12
8.4.4 Summary of Improvement Projects 8-12
8.5 Expansion Program 8-14
8.6 Capital Improvements Plan Summary 8-14
Appendices
Appendix K Detailed CIP Cost Estimates(2019 Amendment only)
Tables
Table ES.1 Repair Program(Only includes projects that were updated as part of the
2019 Amendment) ES-3
Table 4.1 Existing Sewer System Piping Summary(updated in the 2019
Amendment) 4-1
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2019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table 4.2 Trunk and Interceptor Sewer Data(updated in the 2019 Amendment) 4-2
Table 4.1A Blue Heron 1: Pipeline Diameter Changes(added as part of the 2019
Amendment) 4-3
Table 4.1B Blue Heron 2: Pipeline Diameter Changes(added as part of the 2019
Amendment) 4-4
Table 4.1C Downtown Trunks: Pipeline Diameter Changes(added as part of the
2019 Amendment) 4-4
Table 4.1D Forest Highlands: Pipeline Diameter Changes(added as part of the 2019
Amendment) 4-5
Table 4.1E River Front Trunks: Pipeline Diameter Changes(added as part of the
2019 Amendment) 4-5
Table 4.6 Pipeline Repair Projects(only included projects impacted by the 2019
Amendment) 4-8
Table 4.10 Pipeline Repair Projects(updated as part of the 2019 Amendment) 4-8
Table 6.4 Recommended Pipe Capacity Improvements(only includes changes
made as part of the 2019 Amendment) 6-8
Table 6.11 Improvement Programs—Pipes(only includes changes made as part of
the 2019 Amendment) 6-11
Table 8.1 Pipeline Construction Unit Cost(amended as part of the 2019
Amendment) 8-3
Table 8.2 Repair Program(Only includes projects that were updated as part of the
2019 Amendment) 8-10
Table 8.4 Improvement Programs(Only includes projects that were updated as
part of the 2019 Amendment) 8-13
Figures
Figure 6.7 2045 Deficiencies, 25-Year Storm(Updated as part of the 2019
Amendment) 6-5
Figure 6.20 Recommended Improvement and Expansion Projects(Updated as part of
the 2019 Amendment) 6-13
Figure 8.1 Short Term Updated CIP Projects 8-5
Figure 8.2 Long Term Updated CIP Projects 8-7
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE
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2019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Abbreviations
Carollo Carollo Engineers, Inc.
CIP Capital Improvement Plan
CIP Cast Iron Pipe
City City of Lake Oswego
CMLC Cement Mortar Lined and Coated Steel Pipe
DIP Ductile Iron Pipe
ENR CCI Engineering News Record Construction Cost Index
ft feet
GIS Geographic Information System
HDPE High Density Polyethylene
HGL Hydraulic Grade Line
ID Identification
I/I Inflow and Infiltration
in inches
LOIS Lake Oswego Interceptor Sewer
MH Manhole
NASSCO National Association of Sewer Service Companies
PACP Pipeline Assessment and Certification Program
PDWF Peak Dry Weather Flow
Plan Wastewater Collection System Master Plan
PVC Polyvinyl chloride
PWWF Peak Wet Weather Flow
RCP Reinforced concrete pipe
ROW Right-of-way
RUL Remaining useful life
SSO Sanitary sewer overflows
STEP Septic tank effluent pump
T Trunk
WWTP Wastewater Treatment Plant
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE
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2019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Reviser's Note Regarding the 2019 Amendment
This 2019 Amendment was prepared to address discrepancies between the Geographical
Information System(GIS)mapping information used to construct the hydraulic model for the
2013 Wastewater Collection System Master Plan Update(Plan)and installed conditions for five
sewer reaches.These discrepancies were identified by the City during preparation of annual
capital improvement project planning.The five sewer reaches addressed in this 2019 Update are
as follow:
1. Downtown Trunks
2. River Front Trunks
3. Blue Heron 1
4. Blue Heron 2
5. Forest Highlands
For each of the five sewer reaches information from the City was reviewed by Carollo and the
hydraulic model updated based on the new information. Hydraulic modeling was performed
using parameters from the 2013 Plan to identify required improvements. Only changes from the
2013 Plan are addressed in this 2019 Amendment. Changes to the 2013 Plan are noted herein
using underlined and italic insertions and strikeout deletions. Sections of the Plan not impacted
by the discrepancies are either left as is for continuity with the changes or not included in this
amendment and remain the same as set forth in the original 2013 Plan Report finalized in March
2013. Changes made under this 2019 Update are highlighted below:
• Chapter 1—Introduction includes minor changes and was re-printed due to its limited
size. No changes were made to Chapters 2—Policies and Criteria. Chapter 3—Flow
Projections, and Chapter 7—Inflow and Infiltration Reduction Program and therefore not
included in the 2019 Update.
• Information for the five sewer reaches addressed under this 2019 Amendment was
updated in Chapter 4—Existing System and Condition Assessment.
• Limited changes were made to Chapter 5—Model Calibration and only summary
changes are included in this 2019 update.
• Although many portions of Chapter 6—Capacity Evaluation and Chapter 8-CIP have not
entirely changed,there were enough revisions that re-publishing most of these chapters
was required.
Where changes may be significant,the amended text describes the change.Tables and figures
which have substantial changes are also completely replaced, and the word "amended"follows
the table and figure numbers in parentheses.
No changes to any of the appendices were triggered from the updates made in this plan
amendment.
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EXECUTIVE SUMMARY 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
EXECUTIVE SUMMARY
ES.1 Introduction
The purpose of this Wastewater Collection System Master Plan(Plan) is to provide the City of
Lake Oswego(City)a plan for management and operation of their wastewater collection system
for the future.The City has spent several years planning for and constructing the rehabilitated
Lake Oswego Interceptor Sewer(LOIS).As construction of the LOIS comes to a close,the City
needs a plan for the remainder of its aging wastewater infrastructure.This Master Plan evaluated
the condition and capacity of the wastewater collection system and developed feasible
alternatives to mitigate the identified system deficiencies while planning for the necessary future
expansion of the system.
The Plan was initiated in 2010 and developed during 2011 for final approval in 2012. The Plan was
amended in 2019 to address discrepancies identified by the City between the Geographical
Information System(GIS)mapping information used to construct the hydraulic model for the 2013
Plan at five locations:
1. Downtown Trunks
2. River Front Trunks
3. Blue Heron 1
4. Blue Heron 2
5. Forest Highlands
The selected planning period begins in 2010,the year the planning started, and evaluates short-
term improvement needs(Year 2020), long-term improvement needs(Year 2045), and build-out
conditions.The scope of this Master Plan update included the following main tasks:
• Policy&Criteria Review;
• Flow Projections;
• Model Development;
• Condition Assessment;
• Capacity Evaluation;
• Capital Project Development.
ES.2 Policies and Criteria
No change to this section in the 2019 Amendment from the 2013 Plan.
ES.3 Existing System and Condition Assessment
The City operates and maintains approximately one million feet of wastewater pipes, 12 pump
stations, 6 septic tank effluent pump(STEP)systems(serving 21 properties), and 8 STEP service
connections, as shown in Figure ES.2.These include the improvements associated with the LOIS
project,which were completed during preparation of this Plan.
Car�,l' FINAL I FEBRUARY 2020 I ES-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I EXECUTIVE SUMMARY
A preliminary condition assessment was performed for the City's existing major collectors, pump
stations, and STEPs.The condition assessment reviewed the age, estimated remaining useful
life, and recent maintenance records of the City's major collection system infrastructure.The
assessment is useful for identifying improvement projects to extend the useful life of City
infrastructure and prevent failure in the system. Useful life depends largely on the pipe material,
but can also depend on soil conditions,wastewater constituents, and installation.When a pipe is
in service beyond its useful life,the increasing costs of maintenance associated with a failing pipe
will likely warrant replacement.
The recommended projects related to the condition assessment are herein referred to as"repair
projects"and together make up the recommended Repair Program, as shown in Table ES.1. Only
projects revised as part of the 2019 Amendment are included in Table ES.1. The reminder of the
projects identified in the 2013 Plan remains unchanged. The Repair Program is included in the
Capital Improvements Plan in Chapter 8 of the Master Plan.
ES-2 I FEBRUARY 2020 FINAL
EXECUTIVE SUMMARY 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table ES.1 Repair Program(Only includes projects that were updated as part of the 2019 Amendment)
Upstream Upstream Downstream Downstream Diameter Length
Project ID Project Description Modeled SMH Modeled SMH
Manhole ID Manhole ID Manhole ID Manhole ID (in) (ft)
Blue Heron Trunk _ _
T-BH-1 Blue Heron Trunk 1 E09C-0445 5MH03085 E17A-0445 5MH003373 810 4,641
T-BH-201 Blue Heron Trunk 2 E17C-0615 SMH03518 E17A-044S SMH003373 8,10,12 3,687
Forest Highlands Trunk _ _
T-FH-1 Forest Highlands Trunk 1 E04C-0305 SMH00774 E03C 0945 SSMH01175 8,10,12,15 5,654
(E03-1035)
Notes:
(1) No longer includes a capacity improvement project within the extents of the project,based on the changes completed under the 2019 Amendment.See project details in Appendix K for location.
C. Car°`14^4 FINAL I FEBRUARY 2020 1 ES-3
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I EXECUTIVE SUMMARY
ES.4 Policies and Criteria
No change to this section in the 2019 Amendment from the 2013 Plan.
ES.5 Hydraulic Model Development
The limited hydraulic model previously developed for the LOIS project was updated and
extended for the Master Plan.The model was converted and updated using MIKE URBAN,
collection system modeling software developed by the Danish Hydraulic Institute(DHI).The
LOIS model included the primary trunk sewers from each sewer basin, as well as the proposed
interceptor in the lake.The updated collection system hydraulic model includes all these pipe
segments and extends the trunks consistent with the scope of the planning effort and the master
planning needs.The resulting pipes included in the model are herein referred to as"major
collectors."
As part of the 2019 Amendment, the hydraulic model developed in the 2013 Plan was converted to
MIKE URBAN 2019 Version. The hydraulic modeling engine used within the Mike Urban software
package remains MOUSE, which is widely used for planning, analysis, and design related to
stormwater runoff, combined sewers,sanitary sewers, and other drainage systems
The hydraulic model was not recalibrated as part of this amendment. However, because of the
upgrade to MIKE URBAN 2019 version,modeling outputs and results were compared before and
after the upgrade to ensure the hydraulic model was providing similar results between the 2013 and
2019 modeling work.
ES.6 Peak Flow Estimations
No change to this section in the 2019 Amendment from the 2013 Wastewater Collection System
Master Plan.
ES.7 Inflow and Infiltration Reduction Program
No change to this section in the 2019 Amendment from the 2013 Wastewater Collection System
Master Plan.
ES.8 Capacity Evaluation
The capacity evaluation of the collection system and the proposed projects that correct capacity
deficiencies result in two recommended programs:The Improvement Program,which addresses
current capacity deficiencies, and the Expansion Program,which identifies infrastructure
required to serve future customers where the system expands beyond its current configuration.
The following summarizes the recommended Improvement and Expansion Programs.
Improvement Program
Only changes to the identified deficiencies in the 2013 Plan are presented in this section.All areas
not described in this section remain unchanged from the 2013 Plan.As part of the 2019
Amendment, only the Long-Term(2045)model run for the 25-year storm event was updated.
A summary of the capacity-related conveyance pipeline improvements projects,their associated
costs, and recommended phasing are summarized in Table ES.5 and included in the Capital
Improvements Plan in Chapter 8 of the Plan.
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EXECUTIVE SUMMARY 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table ES.5 Recommended Pipe Capacity Improvements(only includes changes made as part of the 2019 Amendment)
Upstream Upstream Downstream Downstream Existing Proposed Length
Project ID Description Modeled SMH Modeled SMH Diameter Diameter (ft)
Manhole ID Manhole ID Manhole ID Manhole ID (in) (in)
T RF 2(2) Rivcrfront Trunk 2 E11B 0555 E11B 067S 12 24 774
T-DWN-3& Downtown Trunk 3 E10A-007S SMH01238 fE10A0365 SMH05009 15/18 21 438
T-DWN-4(1) and Trunk 4
T FH 2(2) Forest Highlands E03C 064S E 03C 0945 3-2 IS 50
Trunk 2
T BH 2(2) Blue Heron Trunk 2 E17B 088S E17A 070S 12 IS 680
Notes:
(1) Prefix"f"in the modeled ID were added during the 2013 Plan to identify pipes and manholes with changes recommended in the future.
(2) These areas are not capacity deficient after updates from GIS were incorporated in the hydraulic model.Projects not needed anymore.
C'arol,iww, FINAL I FEBRUARY 2020 I ES-5
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I EXECUTIVE SUMMARY
Expansion Program
No change to this section in the 2019 Amendment from the 2013 Plan. Recommendations in the
2013 Plan remain unchanged.
ES.9 Capital Improvements Plan
The capital improvements plan(CIP)resulting from the collection system evaluation will provide
the City with a guideline for the planning and budgeting of its wastewater system.The CIP
combines the recommended Repair, Improvement, and Expansion Programs. Chapter 8 of the
Plan summarized the cost estimates and schedule for the recommended improvements.
It is important to note that this CIP does not include costs for maintenance or improvements of
the entire wastewater collection system.This Plan was developed to focus on the City's major
collectors(as defined in Section ES.5)and pump stations as these are the most critical
wastewater infrastructure. Future master plans will likely include evaluation of the small
wastewater pipelines within each basin.
Tables ES.7A and ES.78 summarize the recommended Repair and Improvement projects,
respectively for the five areas addressed as part of the 2019 Amendment. The costs shown for the
projects addressed in the 2019 Update are in 2019 dollars at which time the ENR August CCI was
11293.
ES.10 Summary
No change to this section in the 2019 Amendment from the 2013 Plan.
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EXECUTIVE SUMMARY 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table ES.7A Repair Program(Only includes projects that were updated as part of the 2019 Amendment)
Capital Improvement Phasing
Project ID Project Description Diameter Length zt Short-Term Long-Term
($
(in) (ft) ($)
(2013—2020) (2021—2045)
MAJOR COLLECTOR PROJECTS
Blue Heron Trunk - - -
T-BH-1 Southshore Blvd from Lakeridge Rd to Blue Heron Rd 8,10 4,689 $1,047,000 $1,047,000
T-BH-20) Blue Heron Bay&Cardinal Dr 8,10,12 3687 $1,005,000 $1,005,000
Forest Highlands Trunk - - -
T-FH-1 Iron Mountain Blvd, Country Club Road 8,10,12,15 5654 $2,304,000 $2,304,000
Notes:
(1) No longer includes a capacity improvement project within the extents of the project,based on the changes completed under the 2019 Amendment.See project details in Appendix K for location.
(2) Based on 2019 estimates with an ENR August 2019 CCI of 11293.
Table ES.7B Improvement Program(Only includes projects that were updated as part of the 2019 Amendment)
Capital Improvement Phasing
Project ID Project Description Diameter Length Cost) Short-Term Lon Term
(in) (ft) ($) Long
-Term
—2020) (2021—2045)
Riverfront Trunk
T RF 2 George Rogers Park from Furnace St to Rivcrbend Condos $391,000 $391,000
Downtown Trunk
T DWN 3 and 3rd Street from Evergreen Road to waterfront 21 437 $243,000 $243,000
T-DWN-4
Forest Highlands Trunk
T FH 2 Chandler Rd $17,000 $17,000
Notes:
(1) Based on 2109 estimates with an ENR August 2019 CCI of 11293.
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I EXECUTIVE SUMMARY
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ES-8 I FEBRUARY 2020 I FINAL mar^116
CHAPTER 1 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 1
INTRODUCTION
1.1 Introduction
This chapter presents the objectives of this Wastewater Collection System Master Plan (Plan),
and a brief overview of the City of Lake Oswego's(City's)wastewater collection system.A list of
abbreviations is provided at the front of this 2019 Update to assist the reader in understanding
the information presented in the Plan. On April 6, 2010,the City approved a professional service
agreement with Carollo Engineers, Inc. (Carollo)to prepare this Master Plan for the wastewater
collection system.
The City discovered discrepancies between the Geographical Information System(GIS)mapping
information used to construct the hydraulic model for the 2013 Plan and installed conditions for five
sewer reaches. This 2019 Amendment provides updates to the recommendations presented in the
2013 Plan as a result of the updated information for these five sewers reaches.
1.2 Objective
No change to this section from the 2013 Plan.
1.3 Background
No change to this section from the 2013 Plan.
1.4 Report Organization
The Master Plan report contains eight chapters,followed by appendices that provide supporting
documentation for the information presented.The chapters are briefly described below with
changes made under this 2019 Amendment noted in parenthesis.
Chapter 1—Introduction(minor changes to this chapter). This chapter presents the background
information for this Master Plan and the objectives of the study.
Chapter 2—Policies&Criteria(no changes to this chapter).This chapter presents the policies for
ownership,operations, and maintenance of the collection system. It also reviews the criteria for
evaluating the wastewater collection system.
Chapter 3—Flow Projections(no changes to this chapter).This chapter reviews historical
wastewater flows and presents the methodology for average and peak flow projections.These
flow projections are used throughout the rest of the Master Plan for evaluating future conditions.
Chapter 4—Existing System and Condition Assessment(limited changes to this chapter, mostly
changes to Section 4.2).This chapter describes the existing wastewater collection system. In
addition, a condition assessment was performed for the City's major collectors, pump stations,
and STEPs. Recommendations for repairing infrastructure are included.
icaroIk'- FINAL I FEBRUARY 2020 I 1-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 1
Chapter 5—Hydraulic Model Development(limited changes to this chapter).This chapter
describes the development and calibration of the City's wastewater collection system hydraulic
model.
Chapter 6—Capacity Evaluation(changes to projects and recommendations are highlighted).This
chapter discusses the hydraulic evaluation of the collection system and the proposed projects
that correct capacity deficiencies and serve future users.
Chapter 7—Inflow and Infiltration Reduction Program(no changes to this chapter).This
chapter presents a recommended program for addressing the high inflow and infiltration
experienced in the collection system.The recommendations include prioritizing basins and
program cost estimates.
Chapter 8—Capital Improvement Projects(changes to projects and recommendations are
highlighted). This chapter presents the capital improvement projects and cost estimates.This
chapter is organized to assist the City in making finance decisions.
1.5 Acknowledgments
No change to this section from the 2013 Plan.
1.6 Abbreviations
The list of abbreviations and acronyms is moved to the front of the Plan and only includes
abbreviations included in the 2019 Amendment.
Cp)
1-2 I FEBRUARY 2020 FINAL r�`�^
CHAPTER 2 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 2
BASIS OF PLANNING
There are no changes to Chapter 2 of the 2013 Plan.
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CHAPTER 3 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 3
FLOW PROJECTIONS
There are no changes to Chapter 3 of the 2013 Plan.
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3-2 FEBRUARY 20201 FINAL
CHAPTER 4 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 4
EXISTING SYSTEM
Only sections,figures, and tables impacted by the changes from the 2019 Amendment are included
in this chapter. No changes were made to Section 4.1, and Sections 4.3 through 4.5.
4.2 Pipes
According to the City's Geographic Information System's(GIS)data(November 2010),the
wastewater collection system consists of approximately 186 miles of gravity pipe,two miles of
pressurized pipe(force mains), and 4,800 manholes.The gravity wastewater pipes range in
diameter from 4 inches to 36 inches, and force mains range from 2-inch to 14-inch. The City
provided recent updated data for the five reaches identified in the 2013 Plan. Table 4.1 summarizes
the wastewater piping by diameter, including the total length of pipe and number of pipe segments,
and is updated with the most recent data provided. Only data for the five reaches identified were
used, the rest of the data remains as provided in November2010.
Table 4.1 Existing Sewer System Piping Summary(updated in the 2019 Amendment)
Pipe Diameterm Length of Pipe(ft) Number of Pipe Segments
<6 inches 2,250 13
6 to 8 inches 870,125 5,512
10 to 18 inches 84,028 462
20 to 28 inches 8,404 41
230 inches 16,995 34
Total Gravity Pipes 981,802 6,062
Force mains(2) 11,474 46
Notes:
(1) Data from City's GIS data,November 2010 and 2019 updates to GIS data provided by the City.
(2) Force mains range in diameter from 2 inches to 14 inches.Total does not include the City of Tualatin's Childs Road Pump
Station Force Main.
Wastewater is conveyed by small diameter pipes to collectors in each of the City's basins, as
shown in Figure 4.1 jno change in 2019 Amendment—figure not included). This Plan reviews the
larger collectors serving each basin, herein referred to as major collectors. City staff identified
the major collectors for each basin. Major collectors were defined as pipes with diameters of
10 inches or larger.The major collectors also include some 8-inch diameter pipes selected by
City staff.The combination of the major collectors in each basin is called the basin"trunk,"
e.g.the"McVey Trunk."
The City's GIS data and Hansen system maintenance software provided the geographical and
material information for the major collectors.Table 4.2 summarizes the major collectors by size
and type of material.The majority of the City's major collectors are reinforced concrete pipe
(RCP).A large number of pipes are made of polyvinyl chloride(PVC).The material for some pipes
..0
Car ^ FINAL l FEBRUARY 2020 4-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 4
was unavailable from GIS and the Hansen data. Section 4.2.1 reviews the age and remaining
useful life of the City's major collectors.
Table 4.2 Trunk and Interceptor Sewer Data(updated in the 2019 Amendment)
Diameter PVC HDPE RCP DIP CMLC CIP Relined N/A Total
8 3,255 840 22,928 329 304 1,556 - 1,304 30,096
10 to 18 12,950 2,378 58,173 3,559 4,599 6,545 2,559 8,210 99,201
inches
20 to 28 1,708 2,237 7,117 - 806 - - 526 12,586
inches
30 inches 13,397 4,343 - - - - 678 18,418
plus
Total 17,913 18,852 92,561 3,888 5,709 8,101 2,559 10,718 160,301
Notes:
PVC=Polyvinyl Chloride,HDPE=High Density Polyethylene,RCP=Reinforced Concrete Pipe,DIP=Ductile Iron Pipe,
CMLC=Cement Mortar Lined and Coated Steel Pipe,CIP=Cast Iron Pipe
Following completion of the 2013 Plan, the City discovered discrepancies between the GIS mapping
information used to construct the hydraulic Plan and installed conditions for five sewer reaches as
follows:
Blue Heron 1 Trunk:
The Blue Heron 1 updates changed most of the 10-inch pipes to 8-inch. Updated information for
Blue Heron 1 is shown in Table 4.1A.
Blue Heron 2 Trunk:
The Blue Heron 2 area updates changed the 15-inch pipes to 8-inch,10-inch, and 12-inch pipelines.
Updated information for Blue Heron 2 is shown in Table 4.1B.
Downtown Trunks:
For the Downtown Trunks area, the pipe diameters were changed. The updated information for the
Downtown Trunks area is shown in Table 4.1C.
Forest Highlands Trunk:
The Forest Highlands updates accounted for the 2015 sewer replacement work completed as part of
the LOTWP Schedule 5, where 108 feet of 12-inch pipeline was relocated. Updated information for
the Forest Highlands segments is shown in Table 4.1D.
River Front Trunks:
Pipe diameters were changed in the River Front Trunks area. Updated information for The River
Front Trunks is shown in Table 4.1E.
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CHAPTER 4 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table 4.1A Blue Heron 1: Pipeline Diameter Changes(added as part of the 2019 Amendment)
2013 2019 2013 2019 2013 2019
Dim Upstream Downstream
Modeled Pipe ID Pipe Segment ID Pipe Diameter Pipe Diameter Upstream Level Upstream Level Downstream Level Downstream Length Material
Manhole SMH ID Manhole SMH ID
(in) (in) (ft) (ft) (ft) Level(ft)
E09C-0635 100147 8 8 5MH03085 305.73 320.60 SMH03090 305.11 305.10 249.7 Concrete
E09C-0595 100150 8 8 SMH03090 305.11 305.10 SMH03099 305.09 302.50 166.2 Concrete
E09C-060S 100151 8 8 SMH03099 302.54 302.50 SMH03098 287.19 287.20 274.1 Concrete
E09C-058S 100154 12 8 SMH03098 287.19 287.20 SMH03097 286.59 286.70 56.9 Concrete
E09C-0565 100366 12 8 SMH03097 286.59 286.70 5MH03096 283.31 283.20 169.9 Concrete
E09C-0555 100517 8 8 5MH03096 283.11 283.20 SMH03081 280.56 280.40 275.3 Concrete
E09C-0465 100515 8 8 SMH03081 280.36 280.40 SMH03091 277.64 277.60 161.0 Concrete
E09C-048S 100140 8 8 SMH03091 277.64 277.60 SMH03093 274.48 255.90 345.0 Concrete
E09C-0625 100084 8 8 SMH 03093 255.91 255.90 SMH00055 226.41 226.30 385.8 Concrete
E08D-065S 100420 8 8 SMH 00055 226.40 226.30 SMH03062 205.79 205.80 287.6 Concrete
E08D-0635 100001 8 8 SMH 03062 205.79 205.80 SMH03063 194.59 194.60 287.3 Concrete
E08D-068S 100002 8 8 SMH 03063 194.59 194.60 SMH03065 182.65 182.65 341.2 Concrete
E17A-0045 100040 8 8 SMH 03065 182.65 182.65 SMH03340 165.35 165.35 379.7 Concrete
E17A-011S 100244 8 8 SMH 03340 165.35 165.35 SMH03345 154.82 154.70 160.2 Concrete
E17A-01851 100242 8 8 SMH03345 154.62 154.70 SMH03352 141.52 141.50 144.8 Concrete
fE17A20S1-fE17A040S 100038 8 8 SMH03352 141.52 141.50 SMH03354 106.80 106.90 393.0 Concrete
fE17A040S-fE17A046S 100243 12 8 SMH03354 106.70 106.90 SMH03369 102.80 102.90 133.8 Concrete
fE17A0465-fMH 12 100020 10 10 SMH03369 102.80 102.90 5MH03373 102.19 102.20 48.2 Cast Iron
Notes:
(1) Prefix"f"in the modeled ID were added during the 2013 Plan to identify pipes and manholes with changes recommended in the future.
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 4
Table 4.1B Blue Heron 2: Pipeline Diameter Changes(added as part of the 2019 Amendment)
2013 2019 2013 2019 2013 2019
Upstream Downstream
Modeled Pipe ID Pipe Segment ID Pipe Diameter Pipe Diameter Upstream Level Upstream Level Downstream Level Downstream Level Length Material
(in) (in) Manhole SMH ID Manhole SMH ID
(ft) (ft) (ft) (ft)
E17C-07351 100320 8 8 SMH03523 104.18 104.20 SMH03518 103.50 103.40 169.0 Concrete
E17C-061S1 100321 8 8 SMH03518 103.50 103.40 SMH03513 102.60 102.70 171.0 Concrete
E17C-05551 100118 8 8 SMH03513 102.60 102.70 SMH03509 101.82 101.90 220.2 Concrete
E17C-043S1 100329 8 8 SMH03509 101.82 101.90 SMH03504 101.26 101.30 148.2 Concrete
E17C-031S1 100330 8 8 SMH03504 101.26 101.30 SMH03496 100.06 100.10 300.0 Concrete
E17C-00751 100127 8 8 SMH03496 100.06 100.10 SMH03488 98.66 98.70 347.1 Concrete
E17B-107S1 100128 8 8 SMH03488 98.66 98.70 SMH03485 97.68 97.70 241.5 Concrete
E17B-09851 100129 8 8 SMH03485 97.68 97.70 SMH03743 97.06 97.10 161.8 Concrete
E17B-126S1 100185 8 8 SMH03743 96.38 97.10 SMH03482 96.20 97.00 20.7 Concrete
E17B-093S1 100584 8 8 SMH03482 97.05 97.00 SMH03477 96.38 96.40 145.6 Concrete
E17B-090S1 100458 10 10 SMH03477 96.19 96.40 SMH03483 95.88 95.80 111.8 Concrete
E17B-092S1 100564 10 10 SMH03483 95.72 95.80 SMH03479 94.37 94.30 273.0 Concrete
fE17B88S1-fE17A087S 100221 15 10 SMH03479 94.21 94.30 SMH03415 93.06 93.00 242.6 Concrete
fE17A087S-fE17A070S 100108 15 12 SMH03415 92.96 93.00 SMH03399 91.80 92.00 420.5 Concrete
fE17A070S-fMH 12 100109 12 12 SMH03399 91.70 92.00 SMH03373 90.00 89.60 882.8 Concrete
Table 4.1C Downtown Trunks: Pipeline Diameter Changes(added as part of the 2019 Amendment)
2013 2019 2013 2019 2013 2019
Upstream Downstream
Modeled Pipe ID Pipe Segment ID Pipe Diameter Pipe Diameter Upstream Level Upstream Level Downstream Level Downstream Level Length Material
(in) (in) Manhole SMH ID Manhole SMH ID
(ft) (ft) (ft) (ft)
E10A-004S1 120170 12 12 SMH01237 102.00 102.00 SMH01238 98.53 98.50 160.0 Concrete
E10A-00751 120167 18 15 SMH01238 95.72 95.70 SMH05002 94.90 95.00 194.0 Concrete
E10A-01351 120052 15 15 SMH05002 94.90 95.00 SMH05005 94.67 94.70 57.0 Concrete
E10A-02451 120053 15 15 SMH05005 94.64 94.70 SMH05008 94.56 94.60 40.0 Concrete
E10A-028S1 120054 18 18 SMH05008 94.36 94.60 SMH05009 94.12 94.00 147.0 Concrete
fE10A036S-fMH 25 12 12 SMH05009 93.89 94.00 SMH05012 74.77 89.00 136.0 Concrete
120292 and D.I.
'- Car,.�I^.
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CHAPTER 4 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table 4.1D Forest Highlands: Pipeline Diameter Changes(added as part of the 2019 Amendment)
2013 2019 2013 2019 2013 2019
Upstream Downstream
Modeled Pipe ID Pipe Segment ID Pipe Diameter Pipe Diameter Upstream Level Upstream Level Downstream Level Downstream Level Length Material(Z)
(in) (in) Manhole SMH ID (ft) (foci) Manhole SMH ID (ft) (ft)(1)
E04C-0295 EO4C-036S 150181 10 15 SMH00773 343.04 343.04 SMH00776 340.09 340.09 83.9
E04C-036S EO4C-038S 150182 15 15 SMH00776 340.09 340.09 SMH00782 339.98 340.00 52.1
E04C-0385 EO4C-0405 150182 15 15 SMH00782 339.98 340.00 SMH00783 339.82 339.81 124.6
E04C-0405 EO4C-041S 150183 15 15 SMH00783 339.82 339.81 SMH00780 339.67 339.67 92.3
E04C-041S1 150117 15 15 SMH00780 339.77 339.47 SMH04299 339.32 339.13 211.0
E04C-09851 150075 15 15 SMH04299 339.32 339.13 SMH00784 338.86 338.86 163.0
E04C-03951 150192 15 15 SMH00784 338.66 338.66 SMH00785 338.14 338.14 374.3
E04D-01251 150106 15 15 SMH00785 338.14 338.14 SMH00845 307.31 307.31 490.6
E04D-01351 150107 15 12 SMH00845 306.79 306.79 SMH00846 301.17 301.17 268.8
E04D-014S1 150108 15 15 SMH00846 300.67 300.67 SMH00847 300.07 300.07 274.4
E04D-01551 150113 15 15 SMH00847 300.07 300.07 SMH00848 299.20 299.20 433.3
E04D-016S1 150114 15 15 SMH00848 299.00 299.00 SMH00722 298.00 298.00 508.4
E04D-01751 150115 15 15 SMH00722 298.00 298.00 SMH00849 281.20 281.20 281.4
E04D-018S1 150078 15 15 SMH00849 281.20 281.20 SMH00723 263.20 263.20 286.4
E03C-02951 150053 15 15 SMH00723 263.20 263.20 SMH00724 251.50 251.50 224.9
E03C-030S1 150125 15 15 SMH00724 251.50 251.50 SMH00725 250.76 250.76 310.3
E03C-031S1 150236 15 12 SMH00725 249.76 249.76 SMH00726 249.40 249.40 106.7
E03C-03451 150235 15 15 SMH00726 248.90 248.90 SMH00727 248.34 248.34 258.1
E03C-03851 150126 15 18 SMH00727 243.16 243.16 SMH00728 230.16 229.87 290.6
E03C-050S1 150001 15 15 SMH00728 229.54 229.62 SMH01170 228.40 228.40 418.7
E03C-06351 120233 15 15 SMH01170 228.40 228.40 SMH01175 226.48 226.48 344.5
E03C-103S1 120305 15 15 SMH01175 225.60 225.60 SMH05129 225.00 225.00 56.3
Notes:
(1) Unlike the other areas,2019 Upstream and Downstream Inverts for Forest Highlands were obtained from as-built drawings provided by the City.
(2) Material information not provided by the City.
Table 4.1E River Front Trunks: Pipeline Diameter Changes(added as part of the 2019 Amendment)
2013 2019 2013 2019 2013 2019
Upstream Downstream
Modeled Pipe ID Pipe Segment ID Pipe Diameter Pipe Diameter Upstream Level Upstream Level Downstream Level Downstream Level Length Materi.
(in) (in) Manhole SMH ID Manhole SMH ID
(ft) (ft) (ft) (ft)
E11B-05351 270015 24 24 SMH01919 69.54 69.50 SMH01961 65.38 65.40 173.3 C905 PVC
E11B-054S1 270081 12 12 SMH01961 65.28 65.40 SMH01962 36.97 37.00 99.9 Ductile Iron
E11B-05551 270087 24 24 SMH01962 36.80 37.00 SMH01974 36.40 36.20 67.2 C905 PVC
E11B-06851 270082 24 24 SMH01974 36.10 36.20 SMH01965 33.90 32.20 258.1 C905 PVC
E11B-051S1 270090 24 18 SMH01965 33.87 32.20 SMH01958 30.37 29.10 173.1 RCSP III
E11B-04851 270077 24 18 SMH01958 29.06 29.10 SMH01971 29.00 29.00 18.8 RCSP III
E11B-06751 270088 24 24 SMH01971 29.00 29.00 SMH01972 28.70 28.70 154.3 C900 PVC
..II
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 4
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4-6 FEBRUARY 2020 FINAL
CHAPTER 4 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
4.2.1 Major Collectors Condition Assessment
The current condition was assessed for the City's major collectors, except those owned by other
agencies and the LOIS pipes currently being replaced.The condition assessment focused on
identifying the remaining useful life(RUL)and recent maintenance issues with specific
collectors.
The discrepancies discovered by the City between the GIS mapping information used to construct
the hydraulic model for the 2013 Plan did not impact the condition assessment evaluation;and
therefore, no changes were made to Sections 4.2.1.1., and Sections 4.2.1.2 under the 2019 Update.
Sewer pipe segments addressed in this 2019 Update that are still recommended for repairs are
shown in Table 4.6.
4.6 Repair Program Summary
There are no changes to Section 4.6 in the 2019 Amendment from the 2013 Plan other than
Table 4.10.
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 4
Table4.6 Pipeline Repair Projects(only included projects impacted by the 2019 Amendment)
Project ID Description I Upstream MH T Downstream MH 1 Diameter(in) Length (ft)
Blue Heron Trunk
T-BH-1 Southshore Blvd from Lakeridge Rd to Blue Heron Rd E09C-0445 E17A-044S 8/10 4,689
T-BH-2 Blue Heron Bay&Cardinal Dr E17C-0615 E17A-044S 8/10/12 3,687
Forest Highlands Trunk
T-FH-1 Iron Mountain Blvd,Country Club Road E04C-030S E03C-0645 12/15/18 5,654
Table 4.10 Pipeline Repair Projects(updated as part of the 2019 Amendment)
Project ID Description I Upstream MH 1 Downstream MH 1 Diameter(in) 1 Length (ft)
PIPE PROJECTS
Blue Heron Trunk(updated as part of the 2019 Amendment)
.T-BH-1 Southshore Blvd from Lakeridge Rd to Blue Heron Rd E09C-0445 E17A-044S 8/10 4,689
T-BH-2 Blue Heron Bay&Cardinal Dr E17C-0615 E17A-0445 8/10/12 3,687
Forest Highlands Trunk(updated as part of the 2019 Amendment)
T-FH-1 Iron Mountain Blvd,Country Club Road E04C-030S E03C-0645 12/15/18 5,654
4-8 I FEBRUARY 2020 I FINAL tit C rclap
CHAPTER 5 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 5
HYDRAULIC MODEL DEVELOPMENT
Only sections,figures, and tables impacted by the changes from the 2019 Amendment are included
in this chapter. No changes were made to Section 5.1, and Sections 5.4 through 5.5.
5.1 Introduction
Wastewater collection system models are valuable tools used to assess the performance of
collection systems during dry and wet weather conditions, and to plan future improvements.
These models provide a means to simulate the impact of different sized storms on the collection
system and determine where future system deficiencies are likely to occur. In addition, a well-
calibrated model provides an easy way to test alternative improvement scenarios.This chapter
summarizes the hydraulic model update and calibration for use in the City of Lake Oswego(City)
wastewater conveyance planning.
5.2 Model Update
The hydraulic model developed previously for the Lake Oswego Interceptor Sewer(LOIS)project
was updated for this study. Flow monitoring data collected as part of the preliminary design of
the LOIS project was used for calibration of the wet weather flows.The model was built using
MIKE URBAN,collection system modeling software developed by the Danish Hydraulic Institute
(DHI). More information about the modeling software can be found in the MIKE URBAN
Collection Systems Users Guide(DHI, 2005), as well as the MIKE URBAN Model Manager Users
Guide(DHI,2007).
As part of the 2019 Amendment, the hydraulic model developed in the 2013 Plan was converted to
MIKE URBAN 2019 Version. The hydraulic modeling engine used within the Mike Urban software
package remained MOUSE. However, it is recommended that the City converts the modeling engine
to Mike 1D during its next extensive model update effort.
As-built data and updated GIS information was provided by the City for the following five areas:
• Blue Heron 1
• Blue Heron 2
• Downtown Trunks
• Forest Highlands
• River Front Trunks
These five areas were updated accordingly in the hydraulic model. Updates consisted of diameter
changes and pipe invert elevation changes.
No changes to Section 5.2.1,Section 5.2.2, and Section 5.2.3 from the 2013 Plan were made as part
of the 2019 Amendment.
icaroIk'- FINAL I FEBRUARY 2020 15-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 5
5.3 Model Calibration
Model calibration is a crucial component of the hydraulic modeling effort. Calibration is the
process of adjusting parameters in a model to accurately and precisely represent measured
variables(e.g.,flow, depths,velocity,volume, etc.). Calibration is necessary because collection
system models are mathematical representations of a physical system that incorporate some
level of simplification.These necessary simplifications introduce error and uncertainty into the
analysis.Adjustments of model parameters are necessary to reduce error and better meet the
expectations of the model application.
The hydraulic model was not recalibrated as part of this amendment. However, because of the
upgrade to MIKE URBAN 2019 version,modeling outputs and results were compared before and
after the upgrade to ensure the hydraulic model was providing similar results between the 2013 and
2019 work.
5-2 I FEBRUARY 2020 I FINAL icaroIIo
CHAPTER 6 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 6
CAPACITY EVALUATION
6.1 Introduction
This chapter discusses the hydraulic capacity evaluation of the wastewater collection system and
identifies projects that correct capacity deficiencies and serve future users.This analysis results
in two recommended programs:the Improvement Program,which addresses current capacity
deficiencies, and the Expansion Program,which addresses infrastructure required to serve future
customers.
Only changes to the five areas updated in this 2019 Amendment are presented. Sections 6.3, 6.5
and 6.6 were not impacted by the 2019 Amendment and are therefore not included in this amended
chapter. Section 6.2 was not impacted by the 2019 Amendment, however, is still included because it
is the baseline for identified deficiencies.
Additionally,for information purposes only, Section 6.5.2 of this evaluation looked at the
capacity requirements for serving the upper portion of the Stafford area that can flow by gravity
into the City's wastewater system.The Capital Improvements Plan in Chapter 8 does not include
any projects or programs to serve the Stafford area.
The following sections describe the performance criteria,the pump station capacity evaluation,
and an evaluation of serving future areas of growth.The last section summarizes the
recommended Improvement and Expansion Programs.
6.2 Performance Criteria
Collection system performance criteria establishes the metrics by which existing collection
system infrastructure is evaluated, and by which future facilities will be designed.
Chapter 2- Policies and Criteria established criteria for evaluating the wastewater system;these
are summarized as follows.
6.2.1 Design Storm
Current DEQ standards allow facility overflows for flows resulting from a 5-year, 24-hour storm.
It is likely that the existing conveyance system and pump stations were designed to meet this
criterion. However,there have been regulatory discussions over the past several years about
eliminating all permissible overflows.To date, no regulatory action has been taken to develop
this highly restrictive condition. However,the City has herein adopted the more restrictive
design storm in an effort to reduce and/or eliminate overflows associated with storm events
greater than the 5-year storm.The evaluations described in this Chapter assume a 25-year storm
event. Results from the 5-year storm event are also provided.
icaroIIo FINAL I FEBRUARY 2020 16-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
The following criterion for design storms was established in Chapter 2:
• In accordance with City policy,wastewater system facilities will be designed to
adequately and reliably convey peak hour flows associated with a 24-hour,25-year
recurring storm event without overflowing or discharging to any water bodies.The City
Engineer may permit using a 5-or 10-year recurring storm event for some facilities on a
case-by-case basis.
- 5-year Design Storm(November 25th to 27th, 1998)7-inches total,2.6 inches in a
24-hour period.
- 25-year Design Storm(December 2nd to 4th, 2007)5.2 inches total rain,3.6 inches
in 24 hours(increased to 4 inches based on a NOAA 25-year, 24-hour event).
6.2.2 Pump Stations
The following criterion,which is based on industry standards for pump station design,was
established in Chapter 2:
• All pump stations,except for private stations for a single-family home, shall have a
minimum of two pump units, each with the capacity to handle the expected maximum
flow.
6.2.3 Conveyance System
The following criterion for evaluating the conveyance system was established in Chapter 2:
• The existing system shall be evaluated for two conditions of surcharging, as follows:
- Under Peak Dry Weather Flow(PDWF), pipes can flow full with a depth to full depth
(d/D)ratio of 0.92,
- Under Peak Wet Weather Flow(PWWF),the Hydraulic Grade Line(HGL)must
remain under three feet below any manhole rim.The only exception to this is in
locations where locking manhole rims are used;for these manholes,the HGL was
permitted to rise to the manhole rim elevation.
6.4 Collection System Capacity Evaluation
Following the hydraulic model calibration, a capacity analysis of the modeled collection system
was performed.The capacity analysis entailed identifying areas in the sewer system where flow
restrictions occur or where pipe capacity is insufficient to convey design flows. Sewers that lack
sufficient capacity to convey design flows could produce backwater effects in the collection
system that potentially lead to sanitary sewer overflows(SSOs).
The major collectors and corresponding manholes of the wastewater collection system were
evaluated with the performance criteria for conveying dry and wet weather peak flows, as stated
in Section 6.2.The updated hydraulic model was used for the evaluation.
It is important to note that meeting the peak wet-weather flow criteria(maintaining an HGL
three feet below the manhole rim)is particularly difficult for shallow manholes and pipes.The
City has many shallow manholes and pipes due to the challenging soil conditions and high
groundwater levels. Figure 6.3(no change to this figure in the 2019 Amendment-Figure not
included)shows manholes in the hydraulic model that are less than five feet in depth.
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CHAPTER 6 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
6.4.1 Identified Deficiencies
Only changes to the identified deficiencies in the 2013 Plan are presented in this section.All areas
not described in this section remain unchanged from the 2013 Plan.
An evaluation was performed for minimizing required improvements through I/I reduction in
each basin. Figures 6.4 through 6.9 present the remaining identified system deficiencies after I/I
reduction has been implemented for the Short-Term(2020), Long-Term (2045), and Build-Out
development scenarios for the 5-and 25-year storm events, respectively. Manholes shown in red
have an HGL within 3-feet of the manhole rim according to the model. Manholes outlined in
black have an HGL higher than the manhole rim according to the model.These manholes are
predicted to overflow and are herein referred to as potential SSOs. Manholes shown in orange
are pressure manholes(have bolted lids)that have exceeded the HGL criteria for pressure
manholes.
As part of the 2019 Amendment, only the Long-Term(2045)model run for the 25-year storm event
was updated. Only Figure 6.7 was updated.
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CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
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CHAPTER 6 12019 ADMENDMENT TO THE WASTEWATER MASTER PLAN UPDATE I CITY OF LAKE OSWEGO
_ I - 1 , 1 1 1 I- 1 ,
-� / • air-. I. Z PIN g a , , MM. Legend
MIMI II Long-Term Deficiencies
rrul
I �% • Deficient
kitv • J4i . 4
��;: , 1 STEP:S�N-� illik II \ - • Deficient With Simulated SSO
rdsove4 II 1111
` A . I'l • No Longer Deficient
` ,,,; 25-Year Storm
otik, ti' \ r_, � , t
�;, �'� O HGLAboveCriteria
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icaro//O° Figure 6.7 2045 Deficiencies, 25-Year Storm (Amended in 2019)
Last Revised:October o8,zoig pw:\\IO-PW-INT.Carollo.local:Carollo\Documents\Client\OR\Lake Oswego\„232Aoo\GIS\MXD\Long_term Deficincies 25 year storm.MXD
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
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6-6 I FEBRUARY 2020 I FINAL icaroIIo
CHAPTER 6 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
6.4.2 Recommended Pipeline Improvements
This section describes the recommended improvements to address the noted deficiencies
identified in the hydraulic model.All of the recommended projects are required to address
Short-Term deficiencies. Because most deficiencies are found in the Short-Term,with little
increase at Build-Out,the recommended projects are considered to be pipeline improvements,
as opposed to system expansion due to growth.Therefore,these projects are recommended as
part of the Improvement Program. Recommended projects are sized to adequately convey peak
flows at Build-Out conditions under the 25-year storm.
Table 6.4 presents a summary of the recommended capacity-related pipeline improvements,for
the five areas evaluated in the 2019 Amendment only. The rest of the projects identified in the 2013
Plan that were not impacted by this 2019 Amendment remain unchanged and are not included in
Table 6.4. Recommended projects were assigned project identification(ID)correlating to the
wastewater basin trunk(T)it affects.The recommended pipe diameter and extents of
improvements are provided. Manhole(MH) identification numbers were derived from the City's
wastewater mapping,with the exception of recently constructed manholes as part of the LOIS
project. LOIS manholes are identified as"LOIS MH X".The City's latest SMH Ds were also
included for reference.The projects are shown in Figure 6.10.
icaroIIo FINAL I FEBRUARY 2020 16-7
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
Table 6.4 Recommended Pipe Capacity Improvements(only includes changes made as part of the 2019 Amendment)
Project ID Description Upstream Manhole Downstream Manhole Existing Proposed Length(ft)
Diameter(in) Diameter(in)
T RF 2(2) Riverfront Trunk 2 E11B 0555 E11B 0675 1-2 2-4 774
T-DWN-3& Downtown Trunk 3 and E10A-0075 fE10A036S 15/18 21 438
T-DWN-4(1) Trunk 4
T FH 2(2) Forest Highlands Trunk 2 E03C 06'15 E 03C 09'i5 1-2 15 50
T BH 2(2) Blue Hcron Trunk 2 E17B 0885 E17A 0706 1-2 1-5- 680
Notes:
(1) Original recommendations T-DWN-3 and T-DWN-4 were merged and expanded to include all pipes in between them.
(2) Project T-BH-2 and Project T-FH-2 are not needed anymore and are therefore eliminated from the recommendations.
6-8 I FEBRUARY 2020 1 FINAL ‘-;:aroffo-
CHAPTER 6 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
6.4.2.1 Foothills Road Interceptor
There are no changes to the recommendations for the Foothills Road Interceptor as part of the 2019
Amendment.
6.4.2.2 South Shore Trunk
There are no changes to the recommendation for the South Shore Trunk as part of the 2019
Amendment.
6.4.2.3 Riverfront Trunk
The modeling results for the 2019 Amendment do not show deficiencies in the Riverfront Trunk.As
shown in Chapter 4, revised diameters were updated to larger diameters than those originally used
in the 2013 Plan. The larger diameters result in no surcharging of the sewers, Therefore, this project
(T-RF-2)identified in the 2013 Plan is no longer recommended in the 2019 Amendment.
6.4.2.4 East Mountain Park Trunk
There are no changes to the recommendation for the East Mountain Park Trunk as part of the 2019
Amendment.
6.4.2.5 West Mountain Park Trunk
There are no changes to the recommendation for the West Mountain Park Trunk as part of the 2019
Amendment.
6.4.2.6 Downtown Trunk
The model predicts a few deficiencies in the Downtown Trunk due to inadequate pipe capacity.
The first exists at the end of this trunk near Evergreen St. and 3rd St.It is recommended that the
capacity be increased by replacing the 15-inch and 18-inch pipeline between manhole E10A-007S to
fE10A036S with a 21-inch diameter pipe to reduce the potential for overflows in this area. The
downstream segment(Segment ID 120292)remains a 12-inch pipe. This segment is steep
(approximately 10%slope), which results in high velocities and low levels in the pipe. The 12-inch
segment has sufficient capacity, based on its slope and hydraulic condition, and is not
recommended to be upsized or paralleled.This project is identified as T-DWN-3 in Table 6.4.
6.4.2.7 Blue Heron Trunk
High HGLs and SSOs were found in one location of the Blue Heron Trunk. However, after the
updates made to the hydraulic model as part of the 2019 Amendment, no deficiencies were found in
2045 under the 24-year design storm condition. Therefore no pipe upsize is recommended under this
2019 Amendment.
This same section of the trunkline was identified for repair as part of the Repair program in
Chapter 4. This project becomes a repair project only and was removed from Table 6.4.
6.4.2.8 Forest Highlands Trunk
As shown in Chapter 4—Existing System and Condition Assessment, revised diameters were
updated to larger diameters than those used in the 2013 Plan.As a result, no surcharging is shown
in the 2019 model runs. Therefore project(T-FH-2)is no longer recommended in the 2019
Amendment.
icaroIk'- FINAL I FEBRUARY 2020 16-9
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
6.7 Summary of Recommended Improvements
This section summarizes the recommended projects for the Improvement Program and
Expansion Program.
6.7.1 Improvement Program
The projects listed below are recommended to address capacity deficiencies and are therefore
included in the improvement program.
Pump Stations
There are no changes to the pump station recommendations in the 2019 Amendment from the 2013
Plan.
Pipelines
Table 6.11 presents a summary of the capacity-related pipeline improvements projects. Each of
these projects is included in Chapter 8—Capital Improvements Plan. Figure 6.20 presents the
improvement projects graphically.
6.7.2 Expansion Program
There are no changes to the recommendations in Section 6.7.2 in the 2019 Amendment from the
2013 Plan.
6-10 I FEBRUARY 2020 I FINAL
CHAPTER 6 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table 6.11 Improvement Programs—Pipes(only includes changes made as part of the 2019 Amendment)
Project ID Description Upstream Manhole Downstream Manhole Existing Proposed Length(ft)
Diameter(in) Diameter(in)
T RF 2(2) Rivcrfront Trunk 2 E11B 0555 E11B 0675 12 24 77,1
T-DWN-3& Downtown Trunk 3 E10A-0075 fE10A036S 15/18 21 438
T-DWN-4(1) and Trunk 4
T FH 2(2) Forest Highlands Trunk 2 E03C 06'15 E 03C 09'i5 3-2 I5 50
T BH 2(2) Bluc Heron Trunk 2 E17B 0885 E17A 0705 I5 580
Notes:
(1) Original recommendations T-DWN-3 and T-DWN-4 were merged and expanded to include all pipes in between them.
(2) Project T-BH-2 and Project T-FH-2 are not needed anymore and are therefore eliminated from the recommendations.
Jcarollo- FINAL I FEBRUARY 2020 I 6-11
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
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6-12 I FEBRUARY 2020 I FINAL icaroIIo-
CHAPTER 6 12019 ADMENDMENT TO THE WASTEWATER MASTER PLAN UPDATE I CITY OF LAKE OSWEGO
_ _ 1 - — -\ \ 1 - 1 l 1 1 1 11 •
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icaro//O° Figure 6.20 Recommended Improvement and Expansion Projects (Amended in 2019)
Last Revised:October o8,zoig pw:\\IO-PW-INT.Carollo.local:Carollo\Documents\Client\OR\Lake Oswego\iiz32Aoo\GIS\MXD\Recommended Improvement Projects.MXD
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 6
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C amp prim net,6-14 1 FEBRUARY 2020 I FINAL
CHAPTER 7 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 7
INFLOW AND INFILTRATION REDUCTION
PROGRAM
There are no changes to Chapter 7 of the 2019 Amendment from the 2013 Plan.
FINAL 1 FEBRUARY 20201 7-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 7
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c
7-2 I FEBRUARY 2020 I FINAL
CHAPTER 8 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Chapter 8
CAPITAL IMPROVEMENT PLAN
8.1 Introduction
This chapter summarizes the Capital Improvement Plan (CIP)for the City of Lake Oswego's
(City's)Wastewater Master Plan(Plan).The purpose of this CIP is to provide the City with a
guideline for the planning and budgeting of its wastewater system.The CIP combines the
recommended Repair, Improvement, and Expansion Programs recommended in the previous
chapters.The CIP consists of the cost estimates and schedule for the recommended
improvements. Only sections,figures, and tables impacted by the changes from the 2019
Amendment are included in this chapter. No changes were made to Section 8.5.
It is important to note that this CIP does not include costs for maintenance or improvements of
the entire wastewater collection system.This Plan was developed to focus on the City's major
collectors and pump stations as these are the most critical wastewater infrastructure. Future
master plans will likely include evaluation of the remainder of the system. Generally, pipes
10 inches and larger were assessed and included in the hydraulic model; however, selected
critical wastewater pipes as small as 8-inch in diameter were identified as trunks by the City and
were also included. In the future,the City plans to expand the collection system master plan to
include the smaller pipes within specific basins and may add specific projects to the CIP.
For the purpose of this plan,the following terms will be used to represent projects associated
with condition problems, capacity requirements, and potential new service areas:
• "Repair"= Repair or rehabilitation of infrastructure.These projects are recommended to
renew infrastructure in poor condition, as recommended and prioritized in Chapter 4—
Existing System and Condition Assessment.
• "Improvement"=Increase in capacity of infrastructure to meet capacity requirements of
the existing service area.These projects are recommended to meet the capacity
evaluation criteria, as recommended and prioritized in Chapter 6—Capacity Evaluation.
• "Expansion"=Construct new or increase capacity of existing infrastructure to meet
capacity requirements of areas of service area expansion.These projects are
recommended to meet the wastewater conveyance requirements of potential future
service areas, as recommended in Chapter 6—Capacity Evaluation.
Recommended projects have been assigned a project name associated with the type of project.
The following abbreviations were used:
• "T"=Trunk
• "P"= Pipeline
• "PS"= Pump Station
• "G"=General
..0
Car ^ FINAL I FEBRUARY 2020 8-1
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
The following sections present the cost estimating assumptions,the final recommended
Repair, Improvement, and Expansion Programs, and a summary of the final CIP. Project
phasing is developed between 2013 through 2020(Short-Term), 2021 through 2045
(Long-Term)and beyond 2046(Build-Out). Phasing of recommendations remained
unchanged in the 2019 Amendment.
8.2 Cost Estimating Assumptions
The cost estimates presented in this CIP are opinions developed from bid tabulations, cost
curves, information obtained from previous studies, and Carollo Engineers experience on other
projects.The cost estimates have been prepared for general master planning purposes and for
guidance in project evaluation and implementation. Final costs of a project will depend on actual
labor and material costs, competitive market conditions,final project scope, implementation
schedule, and other variable factors such as preliminary alignment generation, investigation of
alternative routings, and detailed utility and topography surveys.
Costs from the original plan are in 2012 dollars, and are based on an Engineering News Record
Construction Cost Index(ENR CCI)20-City Average of 9291.5(June 2012). Cost estimates were
developed using a Class 4 budget estimate, as established by the American Association of Cost
Estimators.This level of estimate is used for budgeting and feasibility studies and assumes a
10 percent to 40 percent level of project definition.The expected accuracy range is-20 percent
to+30 percent, meaning the actual cost should fall in the range of 20 percent below the estimate
to 30 percent above the estimate.
All costs updated as part of the 2019 Amendment are in 2019 dollars and are based on an
Engineering News Record Construction Cost Index(ENR CCI)20-City Average of 11,293(August
2019). Cost estimates were developed using a Class 4 budget estimate, as established by the
American Association of Cost Estimators. Note, costs for projects and recommendations outside of
the five areas updated in this amendment were not updated to 2019 dollars. CIP totals are not
included in this amended chapter because of the base year difference to develop cost estimates.
Unit costs and direct costs for pipelines are described in Section 8.2.1. Direct costs for pump
station projects were developed individually for each project, as noted in the project
descriptions.Appendix K presents the detailed cost development for the projects updated as part of
the 2019 Amendment. Only changes to the five areas evaluated in the 2019 Amendment were
included.
Construction costs apply the following mark-ups to the direct costs:30 percent contingency,
10 percent general conditions, and 15 percent contractor overhead and profit. Project costs
include an additional 20 percent for engineering, legal, and administration costs.The CIP cost
estimates should be periodically reevaluated to account for changes in inflation.
Specific cost estimates were developed for each pump station project, as noted in the project
descriptions. Pump station and force main construction costs were developed based on projects
of similar size completed by Carollo Engineers and experience on other projects.
Acquisition of property, easements, and right-of-way(ROW)may be required for some of the
recommended projects. However,for the purpose of this Plan, pipeline corridor or easements
are assumed to be in public ROW, and therefore do not require land acquisition. For this reason,
land acquisition is not included in the cost estimates.
8-2 I FEBRUARY 2020 I FINAL
CHAPTER 8 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
8.2.1 Pipeline Unit Cost
Pipeline improvements range in size from 8-inches to 42-inches in diameter. Pipeline unit costs
are shown in Table 8.1.These costs were developed from recent construction costs of various
wastewater pipelines and either PVC or HDPE materials.To be conservative,these unit costs
assume open-trench construction in improved areas. Iftrenchless construction is possible for
some projects,the cost estimates may decrease. Costs include pavement cutting, excavation,
hauling, shoring, pipe materials and installation, backfill material and installation, and pavement
replacement.The unit costs are for"typical"field conditions with construction in stable soil at a
depth ranging between 8 to 10 feet.These costs are total project cost;they include contingency,
general conditions,contractor overhead and profit,and engineering, legal, and administrative
costs.
Table 8.1 Pipeline Construction Unit Cost(amended as part of the 2019 Amendment)
Pipe Size(inches) Pipeline Unit Cost 2012 Pipeline Unit Cost 2019
($/Linear Foot) ($/LinearFoot)(1)
8 $177 $222
10 $222 $278
12 $268 $336
15 $333 $417
18 $379 $476
21 $442 $555
24 $505 $634
27 $568 $713
30 $631 $793
33 $694 $871
36 $758 $951
39 $821 $1,030
42 $884 $1,110
Notes:
(1) Pipeline Unit costs were updated based on the ENR difference between 2012 and 2019 dollars.
8.3 Repair Program
This section describes the changes to the repair recommendations for the City's major collectors
and pump stations based on the condition assessment, presented in Chapter 4—Existing System
and Condition Assessment. The 2019 Amendment did not impact pump stations, and therefore,
recommendations remain identical to the ones in the 2013 Plan.
Several repair projects were recommended to address the condition-related deficiencies.
Implementing an Asset Management Program to prioritize these and other repair projects was
also recommended.Table 8.2 summarizes repair projects that have been updated as part of the
2019 Amendment,their associated costs and phasing. Figures 8.1 through 8.3 illustrate the
revised short-term, long-term, and build-out improvement projects, respectively,for all repair,
improvement, and expansion projects.Note, there is no changes to Figure 8.3, therefore, the figure
was not updated and included in this 2019 Amendment.
..0
Car ^ FINAL I FEBRUARY 2020 18-3
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
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�
8-4 FEBRUARY 2020 FINAL
CHAPTER 8 12019 ADMENDMENT TO THE WASTEWATER MASTER PLAN UPDATE I CITY OF LAKE OSWEGO
MIMI_-� u=— �� a NE 4n sliv,!, , Legend
■PriIMPInuilg ...... ainw su Short-Term Improvement Projects
I/ �—�� �frollik Lift Stations
A
T 1.- �G \ STEP N inkII
-
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J `� A� • � ��^ �`Ijr-r.„.....
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\ � � _ l _ '� U ' , STt t Improvement No Longer Needed
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igi • \ \ - �I r—; G ` Longer Needed
iri
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oli
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. T D �1N1
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a1■ 11 represent approximate locations.
,,\, ¢ _� � Engineeringand/orsurveyaccuracy
<� C'' ` �� , ,. 8Is not implied.
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drCa/'O//O° Figure 8.1 Short-term CIP Recommended Projects (Amended in 2019)
Last Revised:October o8,zoig pw:\\IO-PW-INT.Carollo.local:Carollo\Documents\Client\OR\Lake Oswego\iiz32Aoo\GIS\MXD\Short_Term_CIP_Recom mended Projects.MXD
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
-This Page Intentionally Left Blank-
Cari.i/,w
8-6 I FEBRUARY 2020 I FINAL
CHAPTER 8 12019 ADMENDMENT TO THE WASTEWATER MASTER PLAN UPDATE I CITY OF LAKE OSWEGO
_ I - ' I I I - I , , , , r—, .
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iN g
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/. Pipelines
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41.
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or •' r, 1 ' _. , 6 �) t :US-D �:: ` 7 0 All Other Pipelines
C TIMBERLINE DR o, � z And 9!� USB Boundary
® M' I ` �� — - /"", Ohl��C� Wastewater Basins
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COURTNE Feet
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figure are for planning purposes and
El
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=m/'� IV is not implied.
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icaro//O° Figure 8.2 Long-term CIP Recommended Projects (Amended in 2019)
Last Revised:October o8,zoig pw:\\IO-PW-INT.Carollo.local:Carollo\Documents\Client\OR\Lake Oswego\iiz32Aoo\GIS\MXD\Long_Term_CIP_Recom mended Projects.MXD
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
-This Page Intentionally Left Blank-
Caro.i/,w
8-8 I FEBRUARY 2020 I FINAL
CHAPTER 8 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
8.3.1 Pipeline Repair Projects
Many of the City's major collectors have less than 20 years of remaining useful life(RUL).The
cost of maintaining these aging pipes will likely increase in the next 25 years as pipe
deterioration continues.The following projects are recommended to repair aging pipes.
P-1 Annual Pipeline Repair Program
Chapter 4 evaluated all of the City's major collectors included in this study for RUL.The cost for
replacing all pipes in this study that have exceeded or will exceed their useful life is estimated at
an annual cost of$703,000 in 2012 dollars, and$855,000 in 2019 dollars. It was recommended
that an Annual Pipeline Repair Program be implemented for this amount.This cost represents
the cost of replacing all major collectors that will reach the estimated end of their useful life
within the planning period.This project is included as Project P-1.
Several specific major collectors were further evaluated to prioritize the repair program.These
projects are recommended as highest priority repair projects and should be completed as the
first step of the pipeline repair program. Based on the maintenance records and RUL
assessment, pipe segments appear to be in poor condition in the following basins: Downtown,
L4, McVey, Riverfront, Blue Heron, East Mountain Park, Forest Highlands, South Lake,
Lakewood, and L5 Basins.Table 8.2 presents the list of the highest priority recommended
pipeline repair projects to address these pipe sections and their estimated project costs.The
projects are shown in the order of priority based on the results of the condition analysis. Only
projects revised as part of the 2019 Amendment are included in Table 8.2. The reminder of the
projects identified in the 2013 Plan remains unchanged.
Cost estimates were prepared for these high-priority projects assuming open-trench
construction. It was also assumed that the existing pipe sizes would not change for these
projects, unless they also overlap with a capacity improvement project. Projects that overlap
with a capacity improvement project are noted in Table 8.2 below. Costs in Table 8.2 are updated
to the most recent 2019 dollars.
..11
Car ^ FINAL FEBRUARY 2020 I 8-9
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
Table 8.2 Repair Program(Only includes projects that were updated as part of the 2019 Amendment)
Capital Improvement Phasing
Project ID Project Description Diameter Length Cost
(in) (ft) ($)(z) Short-Term Long-Term
(2013—2020) (2021—2045)
MAJOR COLLECTOR PROJECTS
Blue Heron Trunk _ _ _
T-BH-1 Southshore Blvd from Lakeridge Rd to Blue Heron Rd 810 4,689 $1,047,000 $1,047,000
T-BH-21 Blue Heron Bay&Cardinal Dr 8,10,12 3,687 $1,005,000 $1,005,000
Forest Highlands Trunk _ _ _
T-FH-1 Iron Mountain Blvd, Country Club Road 8,10,12,15 5,654 $2,304,000 $2,304,000
Notes:
(1) No longer includes a capacity improvement project within the extents of the project,based on the changes completed under the 2019 Amendment.See project details in Appendix K for location.
(2) Based on 2019 estimates
8-10 I FEBRUARY 2020 I FINAL -carol/a°
CHAPTER 8 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
8.3.2 Pump Stations Repair Projects
There are no changes to Section 8.3.2 in the 2019 Amendment from the 2013 Plan.
8.4 Improvement Program
This section summarizes the recommended Improvement Program,which includes all
recommended improvement projects revised as part of the 2019 Amendment to meet capacity
requirements and the City's criteria.
The Improvement Program also includes general improvement projects, such as asset
management and master plan updates. Chapter 7—Infiltration and Inflow Reduction outlined
inflow and infiltration(I/I)projects to implement to reduce peak flows in the system.
Recommendations from these sections of the Plan are not included in the 2019 Amendment as they
were not impacted by the updates implemented in 2019.
Chapter 6—Capacity Evaluation presented the hydraulic capacity evaluation of the wastewater
collection system and recommended several improvement projects to alleviate identified
deficiencies.The following lists of pipeline and pump station projects assumes that the I/I
Reduction Program is implemented and reaches the target I/I reduction percentage.
8.4.1 General Improvement Projects
There are no changes to Section 8.4.1 in the 2019 Amendment from the 2013 Plan, other than one
additional project(G-4).
Per the recommendation in Chapter 5—Hydraulic Model Development, it is recommended that the
City converts the modeling engine for its DHI Mike Urban hydraulic model from MOUSE to Mike 1D
during its next extensive model update effort. Project G-4 consists of updating the hydraulic model
to perform a comprehensive hydraulic model update and convert the Mike Urban model to the latest
engine and set-up. DHI is retiring the MOUSE engine and moving any new updates and features to
Mike 1D. Project G-4 is recommended in the sort-term and is estimated at approximately$50,000.
8.4.2 Pipeline Improvement Projects
Major collectors in the wastewater system were evaluated against the criterion of keeping the
water surface three feet or more under manhole lids during a 25-year storm event.The hydraulic
model was used to show that several major collectors could not meet this criterion even after
implementing the recommended I/I reduction program.Chapter 6 recommended several
improvement projects to eliminate surcharging conditions. This section only presents
recommendations that were updated as part of the 2019 Amendment.
The Foothills Interceptor Improvement(T-L1-1) is recommended as the first improvement
project.This project was also included in the LOIS Pre-Design, but was intentionally delayed
until the plan for the Foothills Development is finalized. It is recommended that a 24-inch parallel
pipe be installed downstream of the LOIS to provide adequate capacity for the 25-year storm. If
the interceptor changes location with the new development, a single 42-inch diameter pipe may
also suffice, but will require further modeling and confirmation of the capacity with the new
alignment.The effectiveness of all other recommended projects was evaluated assuming that
this project is implemented.The cost estimate for this project assumes the improvements will
follow the existing pipe alignment; cost estimates should be revised when the final alignment is
selected.No change to this project or the assumptions as part of the 2019 Amendment.
..0
Car ^ FINAL I FEBRUARY 2020 8-11
CITY OF LAKE OSWEGO I 2019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
The Blue Heron Trunk project overlapped as both a recommended repair project and improvement
project. However, based on model results for the 2019 Amendment, the Blue Heron Trunk project is
now required to address repairs with no upsizing recommended. The extents of the revised projects
are included in Table 8.2 and were revised to include both the repair and improvement portions of
the projects. Table 8.4 presents the final revised list of recommended pipeline improvement projects.
These projects are shown in order of priority according to their level of deficiency, reduction in
peak flow, and combination with repair projects.All pipe improvement projects are shown in the
Short-Term as they all address current capacity deficiencies. Project costs assume open-trench
construction and were updated to the most recent 2019 dollars.The pipes were sized to meet
Build-Out flow conditions.
8.4.3 Pump Station Improvement Projects
There are no changes to Section 8.4.3 in the 2019 Amendment from the 2013 Plan.
8.4.4 Summary of Improvement Projects
Table 8.4 summarizes all improvement projects revised as part of the 2019 Amendment,
associated costs and recommended phasing. Total costs summaries were not updated as part of
the 2019 Amendment as only the five areas addressed under the 2019 Amendment were updated.
The rest of the projects and recommendations were not updated during this effort and costs
therefore remain in 2012 dollar.
8-12 I FEBRUARY 2020 I FINAL
CHAPTER 8 12019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Table 8.4 Improvement Programs(Only includes projects that were updated as part of the 2019 Amendment)
Capital Improvement Phasing
Project ID Project Description Diameter Length Cost
p (in) (ft) ma) Long-Term
(2013—2020) (2021—2045)
Riverfront Trunk
T RF 2 George Rogers Park from Furnace St to Rivcrbend Condos $391,000 $391,000
Downtown Trunk
T DWN 3 and 3rd Street from Evergreen Road to waterfront 21 437 $243,000 $243,000
T-DWN-4
Forest Highlands Trunk
T FH 2 Chandler Rd $17,000 $17,000
Notes:
(1) Based on 2019 estimates.
arcaroffiry FINAL I FEBRUARY 2020 18-13
CITY OF LAKE OSWEGO 12019 AMENDMENT TO THE WWMP UPDATE I CHAPTER 8
8.5 Expansion Program
There are no changes to section 8.5 in the 2019 Amendment from the 2013 Plan.
8.6 Capital Improvements Plan Summary
Table 8.6 in the 2013 Plan summarizes the recommended Repair, Improvement, and Expansion
projects presented in the Plan. This table was not updated as part of the 2019 Amendment, as only
the five areas addressed under the 2019 Amendment were updated. The rest of the projects and
recommendations were not updated during this effort and costs therefore remained in 2012 dollar.
r„no1
8-14 FEBRUARY 2020 FINAL Ca
2019 AMENDMENT TO THE WWMP UPDATE I CITY OF LAKE OSWEGO
Appendix K
DETAILED CIP COST ESTIMATES (2019
AMENDMENT ONLY)
Jcaro110 FINAL I FEBRUARY 2020
Cep City of Lake Oswego �f
Amendmento Wastewater Collection System Master Plan w ,
C
2019 t ^
Capital Improvements Program
Project Identification: T-BH-1 Project Type:Repair
T-BH-2
Project Name: Blue Heron Trunk
Project Description Project Justification
Southshore Blvd from Lakeridge Rd to Blue Heron Rd.Blue Heron Bay and Cardinal Pipeline has less than 10 years of remaining useful life(RUL)and problems were indicated in Hansen
Dr. inspection reports.
Project Schedule Long-Term
Contingency General Conditions General Contractor Overhead Engineer/ Total Capital
Project Element Quantity Unit Unit Cost Cost Legal/Admin Cost
30% Subtotal 10% Subtotal 15% Subtotal 20%
8-inch pipeline 6397 LF $ 113 $ 721,002 $ 216,301 $ 937,302 $ 93,730 $ 1,031,033 $ 154,655 $ 1,185,688 $ 237,138 $ 1,423,000
10-inch pipeline 676 LF $ 141 $ 95,306 $ 28,592 $ 123,898 $ 12,390 $ 136,287 $ 20,443 $ 156,730 $ 31,346 $ 189,000
12-inch pipeline 1303 LF $ 170 $ 222,161 $ 66,648 $ 288,809 $ 28,881 $ 317,690 $ 47,653 $ 365,343 $ 73,069 $ 439,000
-TOTAL I 2,051,000
Upstream Downstream
Upstream Manhole Downstream
Proiect Location Modeled Modeled
SMH ID: Manhole SMH ID:
Manhole: Manhole:
T-BH-1 E09C-044S SMH03085 E17A-044S SMH003373
T-BH-2 El 7C-061 S SMH03518 E17A-044S SMH003373 Upsize is not recommended in the 2019 Amendment.Pipeline is still recommended for replacement for condition purpose.
8 $ a g,o r T_BH-1 , g.. •,s.. : :,. B" , 4, 8"8" o db 8..,. 7. 8' 69 844 i.
Legend /.11
8 ro,'f 8 8, 3 9 - s r C Manholes
16" rn A o $• a" g' B' a as e 6" g 8"8 N Repair Improvement Project
16" m m 9' 6 :D d in a„ dv.
,a 8. 6' 8+m �_ " 8• �. 6" ,'� -Modeled Collection System
g^8.,•6' rc .t:8"6' 8- 8" a. 8" 8"8"SP' 6., _ 8"8" 8" 8"8"8" e
'to 8"W m 6. it g' $ All Other Pipelines
s� 8'•e.. 8„ 6„ 6,. `z ro h "t g,. y s+ 6" - m m m `g a+, Tax lots
6" $' dr, DD 8.. 8•
r• s co 8" m g• ax 6' ¢' a.. 8., & - 9 8,. 8..
8,.
8'• 8" 9' 8.. 'c ' �i 6" .''� 6, Eo 6', f° ra °'- , a.. m 8''
a- a.
to, - ti 8.. 5 8" s
8.. = co p.. _ '� a g• &: a _� B. : g. 8" 8" Sn 8" 4.9 to ,
io 8" m m' 8., W tiR 4� B 8.. g B• w s., eC�c a,. 4' g.. s-. 4a 0 g m g g. 8,. s� s to 8,. E. �to ED
PF s4 Feet
8' ^ao
O 6' 8•' 0 900 1,800
a' g m
m 8 8" : 8�. 8" 8' ce $' c; g' 4 T aR 0...,
$ �6 m 64 -\,,,_All
8.. 8.. 8° 7o m N m 0.6. to 8„ uc �, 6., 8" ., B iv w 8
8„ 8'o va 2 e.. 8' 6,. g, w $, 8"8' S„8"
E� m -[p $• 8" B„ Qt 8n �. c OVCR100H DR 8" 9
C. 8„ 8„ $. B. $,. m ro sA a io is 'a
6 _ 8" _� `� m s" 04 8. 6" 8" g•cP"a., 8" i
Eo 6• m m 8,, m g- y
$ 6" EA
Cam/ City of Lake Oswego C a0.04.114.14
w 1,2019 Amendment to Wastewater Collection System Master Plan
Capital Improvements Program
Project Identification: T-BH-1 Project Type:Repair
Project Name: Blue Heron Trunk 1
Project Description Project Justification
Southshore Blvd from Lakeridge Rd to Blue Heron Rd.Blue Heron Bay and Cardinal Pipeline has less than 10 years of remaining useful life(RUL)and problems were indicated in Hansen
Dr. inspection reports.
Project Schedule Long-Term
Contingency General Conditions General Contractor Overhead Engineer/ Total Capital
Project Element Quantity Unit Unit Cost Cost Legal/Admin Cost
30% Subtotal 10% Subtotal 15% Subtotal 20%
8-inch pipeline 4641 LF $ 113 $ 523,082 $ 156,925 $ 680,007 $ 68,001 $ 748,008 $ 112,201 $ 860,209 $ 172,042 $ 1,033,000
10-inch pipeline 48 LF $ 141 $ 6,799 $ 2,040 $ 8,839 $ 884 $ 9,723 $ 1,458 $ 11,182 $ 2,236 $ 14,000
-TOTAL 15 1,047,000
Upstream Downstream
Upstream Manhole Downstream
Proiect Location Modeled Modeled
SMH ID: Manhole SMH ID:
Manhole: Manhole:
T-BH-1 E09C-044S SMH03085 E17A-044S SMH003373
8 $ a 6,o ' tt S " g^ 8.,8, o d' 8., 8., s" ti Legend A.
VI
8.
ro m 8 a" A ji. 8 'a a C Manholes
m g. 8„ 6„io - 8+ d+, fa S 0" , t m 5' j,
15° rn A o ' e" �' B' a' •as m 8 6" 6. 8"0, N Repair Improvement Project
,a 8.� 6' 8+m �_ g• .0 '. 6" 4,'� -Modeled Collection System
g•8.,•6' ._ .Z:g'6' a- 8" g. 8" 8"8'a- 8" _ 6"8" 8,. 8.�8„8,. �' s
co_
io 8"W o,8" 1 g' $ All Other Pipelines
s� i 8,,e., 8„ 6,. 6' `z ro h g,. 6, i 6., - `n `n `g a,: Tax lots
r• s co 8" 8'• ax 6.- ¢' a" a- 6' - 9 8" 8-
8"
8�. 8�. 0" 8,. 'o 6" .r'� g,. Eo 6', to ra a. 6. 8�, to 8 8„ 8�. 6
8, = is 4, 6... _ 'C g. &s a _- 8" : g. $„ 8�, 50 8,. is ,
e,. m m� 8• 8.,8, W tiry G. S 8,. g e• w s, eCc I.
8„ g,. 9+ 0 g rs 0'- s�. 8,. so s to 8„ E. 5sw`` s4 Feet
•
8' •
^O �, 8., m 0 900 1,800
6 ID
m fo g" $�. B�, S" ti n d� 6 �= 8ryB m g• $6`+
a" g m
Eio e S,. a.. s �' az a B $ m a 8.."$ rn6 mo. '`-Ls$�. 8.. 8° �o m N m ao is 8" ,_ 6., 8" B 8
8,. a. o S. 2 g,. a.. 6,. g, $, 8.,8^ s„a-
E� m io 8" 8" 03 a„ 6i 8e 6, q -1,, OVCR100H DR 8, 9
♦i-. . IL 8„ 6, 6�. B. 8,. m rn- ro E" �, is B r ilier.millir
Eo 6• 'n m 8" m g- y
\al V" 8', 8.' 8" 6" $ a0' ¢ g61 rn o, 6.. 6,.
$ 6" EA
Cam/ City of Lake Oswego C D
2019 t Amendmento Wastewater Collection System Master Plan a w ,
Capital Improvements Program
Project Identification: T-BH-2 Project Type:Repair
Project Name: Blue Heron Trunk 2
Project Description Project Justification
Southshore Blvd from Lakeridge Rd to Blue Heron Rd.Blue Heron Bay and Cardinal Pipeline has less than 10 years of remaining useful life(RUL)and problems were indicated in Hansen
Dr. inspection reports.
Project Schedule Long-Term
Contingency General Conditions General Contractor Overhead Engineer/ Total Capital
Project Element Quantity Unit Unit Cost Cost Legal/Admin Cost
30% Subtotal 10% Subtotal 15% Subtotal 20%
8-inch pipeline 1756 LF $ 113 $ 197,920 $ 59,376 $ 257,296 $ 25,730 $ 283,025 $ 42,454 $ 325,479 $ 65,096 $ 391,000
10-inch pipeline 627 LF $ 141 $ 88,506 $ 26,552 $ 115,058 $ 11,506 $ 126,564 $ 18,985 $ 145,549 $ 29,110 $ 175,000
12-inch pipeline 1303 LF $ 170 $ 222,212 $ 66,664 $ 288,876 $ 28,888 $ 317,763 $ 47,664 $ 365,428 $ 73,086 $ 439,000
-TOTAL j 5 1,005,000
Upstream Downstream
Upstream Manhole Downstream
Proiect Location Modeled Modeled
SMH ID: Manhole SMH ID:
Manhole: Manhole:
T-BH-2 E17C-061S SMH03518 E17A-044S SMH003373 Upsize is not recommended in the 2019 Amendment.Pipeline is still recommended for replacement for condition purpose.
8 e a 6 g,o T-BH S" " g^ • '0 8.,8. o d' 8., 8" 8„ 693 €'ry Legend /.11
I 8., µ�e.H;,n K . 8' m 8.. 8 t0 6 w 8.. 8 8 ��+i
o 8 8„ S 6 C Manholes
m g. 8., 8„io 8+ &, to S 8" 4 m ' j,
/8' 01 A ' a" $' a - a; m e 6" g s"8 N •Repair Improvement Project
w ,a 8.� 6' 8+m �- " g• m �. 6" e �,'� -Modeled Collection System
8^8.,•6' rc .t:g'8' 8- 8" g. e., 8.8��8., 6., _ 8" 4.
8" $�. - co8.�8„B,. e
i0 8"W o,8' ifo 4, All Other Pipelines
s� 6„ 8" `z h 8,. n, 8., - m m ` a+, Tax lots
ti; 6" $' s 84 8'
8„ - 5 8.,_ $•8�. 0.,
to g„ 8�. 6„ 8,. 'o 6" ' 6, [0 6", do ra al- d' 8„ m 8 8,. 8'. 8
8,
rn, - ti 8.. 5 8" 9
8� = is dn p.. 'C i. g. d's a _- 8" : g. 8„ 8„ to 8" is ,
e,. m m� 8• 8..8, W tiry 4� S 8,. g B• w s", ao o�U
I.
a„ g,. 9+ 0 g el g.- s�. 8,. 6 8 to 8„ m 5sw`` s4 Feet
8' ^O 8' s„ m 0 900 1,800
m to g„ �. B�, S" ti n d� 6 �= 8ryB m g• $6`+
a" 'g m
m 8 `� S„ :"a.. 8" 8' �' az 0 B' $ as aR B.,W$ �6 m f1 fs
$„ 8„ 8° �o m N - 0. to 8„ �_ 8., 8" B 8
8„ a. o s, 2 g,. a.. 6,. g, $, 8.,8„ s„8.,
E� m to 7 8" 8" 03 B„ 61 8c 5„'. . s OVCRI 00H DR 8„ 9
C-. . 40,
IL 8„ 6, 8�. B. 8,. m rn- ro e 6•„ �, m is B r
Eo 8. oo T., 4. 8. m g- y4 '
al V" B„ .'B 8„ 6" $ ¢ g61 rn o, 6.. e,.
$ 6" W
City of Lake Oswego rwli^
` 2019 Amendment to Wastewater Collection System Master Plan Ca- _ __ -_.
....a Capital Improvements Program
Project Identification: T-DWN-3 Project Type:Improvement
T-DWN-4
Project Name: Downtown Trunk
Project Description Project Justification
3rd Street from Evergreen Road to waterfront. Replace E10A-024S1,E10A-028S1,E10A-007S1,&E10A-013S1 pipes with 21-inch pipes to reduce
potential surcharging with a 25-year storm.
Project Schedule Short-Term
Contingency General Conditions General Contractor Overhead Engineer/ Total Capital
Project Element Quantity Unit Unit Cost Cost Legal/Admin Cost
30% Subtotal 10% Subtotal 15% Subtotal 20%
21-inch pipeline 437 LF $ 281 $ 122,855 $ 36,856.50 $ 159,711 $ 15,971 $ 175,683 $ 26,352 $ 202,035 $ 40,407 $ 243,000
Upstream Downstream Downstream
Project Location Modeled Upstream Manhole Modeled Manhole SMH
Manhole: SMH ID: Manhole: ID:
T-DWN-3&T-DWN-4 E10A-007S SMH01238 E10A-036S SMH05009
- 12"`"16L._E10A-007S bend /&
�E cRFEyNc, c Manholes
$ 5• e.. P_''i9' ililli 1 - J,ImprovementProject
` ti El0A-011S -:�� -Modeled Collection System
- != ° _ -All Other Pipelines
70
'- 3 1g�5 - !Taxlots
P
CD
a - - - - sr 4'- EIOA-07OS Feet
0 100 200
AA
E° 7 '
E10A-0245� `_.,. ,ElOA-0285
itA,
vPK9P'l0 A
a a i r
ti
�
N
�' - El0A-150S
6 E10A-0365'\c.•ETOA-149S
O City of Lake Oswego w rw no%
2019 Amendment to Wastewater Collection System Master Plan '
Capital Improvements Program
Project Identification: T-FH-1 Project Type:Repair
Project Name: Forest Highlands Trunk
Project Description Project Justification
Iron Mountain Blvd,Country Club Rd Pipeline has less than 10 years of remaining useful life(RUL)and problems were indicated in
Hansen inspection reports.
Project Schedule Long-Term
Contingency General Conditions General Contractor Overhead Engineer/ Total Capital
Project Element Quantity Unit Unit Cost Cost Legal/Admjn Cost
30% Subtotal 10% Subtotal 15% Subtotal 20%
8-inch pipeline 52 LF $ 113 $ 5,861 $ 1,758 $ 7,619 $ 762 $ 8,381 $ 1,257 $ 9,638 $ 1,928 $ 12,000
10-inch pipeline 301 LF $ 141 $ 42,462 $ 12,738 $ 55,200 $ 5,520 $ 60,720 $ 9,108 $ 69,828 $ 13,966 $ 84,000
12-inch pipeline 56 LF $ 170 $ 9,548 $ 2,864 $ 12,412 $ 1,241 $ 13,654 $ 2,048 $ 15,702 $ 3,140 $ 19,000
15-inch pipeline 5245 LF $ 211 $ 1,109,197 $ 332,759 $ 1,441,956 $ 144,196 $ 1,586,152 $ 237,923 $ 1,824,075 $ 364,815 $ 2,189,000
TOTAL
$ 2,304,000
Project Location Upstream Modeled Upstream Manhole Downstream Modeled Downstream
Manhole: SMH ID: Manhole: Manhole SMH ID:
T-FH-1 E04C-030S SMH00774 E03C-094S(E03-1035) SSMH01175
}
6",.., Legend
A.
k+ ASS� A`tP ,,g r -. - g o Manholes
ro.,-." c Vnc �8`s,�9a 9g5 p�Y-' ,i -�' Repair Improvement Project
0
8-� 7S • ..��-• 75 ^�� '8, g �- 8 - �� ~ -- �•: 8" 6' -Modeled Collection System
r m is 15• e' g„ T FH i 0 e.. e _ 3CA3,S S
-� g"Q. m ' T-Fi-M 15" N 15" n 15.... • - 15' - •e'er' -AII Other Pipelines
,01 o w r' ci o d `0 15" 2 15" 15" ` Iv. 0 15" 1S' •ems g.'h Tax lots
d • o
m C w o o v $ d n
- w w LI m N s, Feet
m w W E03C-038S '7 �y^ 0 400 800
�: 8..
= :I
of :. r5'Ci5 E030-0505
Ark!`' hi ai.:;. 5c, 4 v, -NI el W
SS' 3 m ;110-'- :,eliii
w
s. E03C-063S _w 'r
15"
w 4 �.
.8^ 5 .6'-E03C-088S