HomeMy WebLinkAboutWS 2024-04-15 COMPLETE AGENDA PACKETw
Tukwila City
❖ WORK
Council Agenda
SESSION ❖
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Thomas McLeod, Mayor Councilmembers: ❖ De'Sean Quinn ❖ Tosh Sharp
Marty Wine, Interim City Administrator ❖ Armen Papyan ❖ Jovita McConnell
Mohamed Abdi, Council President ❖ Dennis Martinez ❖ Hannah Hedrick
1905
ON -SITE PRESENCE:
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Monday, April 15, 2024; 5:30 PM
1. CALL TO ORDER
2. BUSINESS ITEMS
a. Update on Annual Overlay & Repair Program.
David Baus, Project Manager
b. Update on Neighborhood Traffic Calming Program.
Cyndy Knighton, Senior Program Manager - Transportation
c. Introduction to Six -Year Transportation Improvement Program
(TIP)
Cyndy Knighton, Senior Program Manager - Transportation
Pg.1
Pg.91
Pg.115
3. ADJOURNMENT
This agenda
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TO:
FROM:
BY:
CC:
DATE:
SUBJECT:
ISSUE
Presentation
City of Tukwila
Thomas McLeod, Mayor
INFORMATIONAL MEMORANDUM
City Council
Hari Ponnekanti, Public Works Director/City Engineer
David Baus, Project Manager
Mayor Thomas McLeod
April 12, 2024
Annual Overlay & Repair Program
of the City's Annual Overlay Program.
BACKGROUND
Tukwila owns, operates, and maintains just over 200 lane miles of paved asphalt roadways.
Public Works must understand and be able to forecast which roads need maintenance before
full repair is needed. Normal pavement maintenance is done in the form of an overlay, which
can be done at a fraction of the cost of a complete overhaul or replacement of failed pavement
and subgrade. One dollar spent for maintenance saves eight dollars from being needed to
reconstruct a road. Staff maintains a database that includes dates when roads have been
overlaid and current pavement conditions. That database allows staff to project when road
sections may need an overlay.
A key piece of data is the Pavement Condition Index (PCI) of the road surface. A PCI study is
conducted using pavement management consultants every 4 or so years. The study is made up
from data collected by a van driving all roads in the City looking for signs of deterioration and
distress such as cracking, rutting, surface wear, humps, bumps, and sags.
DISCUSSION
The most recent PCI Report from 2020 indicates the leading cause of pavement failure comes
from: heavy side -loading garbage and recycling trucks; school buses; and delivery vehicles — a
typical pattern seen across most cities. The attached PCI Report discusses the current
conditions of Tukwila's street network and how the PCI rating was developed and applied. The
Report also shows that Tukwila's overall average pavement condition score is slightly above the
national average but will require more than the current $1.05M annual construction budget to
maintain the strong number.
The executive summary conclusion from the 2020 Report says: "The Tukwila network has an
average PCI of 65.6 and a backlog of 1.3%, with most of the network landing in the Very Good
PCI range. With the City's existing budget, the network conditions will degrade into the high 50s
PCI range and backlog will continue to grow over time. It is worth noting that the City does have
a fair amount of streets approaching the end of their lifespan where overlays can be effective
representing a percentage of the network at the steepest part of their deterioration curves."
FINANCIAL IMPACT
The Annual Overlay Projected funding comes from the Solid Waste Utility Tax. Tukwila is not
eligible for most overlay grants but has been recently awarded federal grants for three roads on
the National Highway System.
ATTACHMENTS
• CIP Page 12
• 2020 Pavement Condition Report and relevant exhibits
1
2
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2023 to 2028
PROJECT: Annual Overlay and Repair Program Project No. 80010401
DESCRIPTION: Select, design and construct asphalt and concrete pavement overlays of arterial and residential streets.
JUSTIFICATION: Preserve and maintain the street structure in a safe and useable state by resurfacing before failure which also
minimizes costs. Some individual sites may be coordinated with water, sewer, and surface water projects.
STATUS: Each year various sections of roadway throughout the City are designed and constructed for asphalt overlay.
MAINT. IMPACT: Reduces annual maintenance.
COMMENT: Ongoing project. Only one year actuals shown in first column.
FINANCIAL Through Estimated
(in $000's)
2021 2022 2023
2024
2025
2026
2027
2028
BEYOND TOTAL
EXPENSES
Design
316
150
150
150
150
150
150
150
150
1,516
Land (R/W)
0
Const. Mgmt.
43
200
200
200
200
200
200
200
200
1,643
Construction
970
1,050
1,050
1,050
1,050
1,050
1,150
1,150
1,300
9,820
TOTAL EXPENSES
1,329
1,400
1,400
1,400
1,400
1,400
1,500 1
1,500
1,650
12,979
FUND SOURCES
Awarded Grant
0
Proposed Grant
0
Mitigation Actual
0
Mitigation Expected
0
Solid Waste Utility Tax
1,329
1,400
1,400
1,400
1,400
1,400
1,500
1,500
1,650
12,979
TOTAL SOURCES
1,329
1,400
1,400
1,400
1,400
1,400
1,500
1,500
1,650
12,979
2023 - 2028 Capital Improvement Program
® ,M
12
3
4
C7� Of T u r w ! ! A
Pavement Analysis
5 - Year Post Rehab PCI:
$1,050,000 Annual Budge
by Segment
White Center
Heights
Park Pond
Burien
Lake
Label Legend
(when applicable)
1234 GISID
1234 Project ID
Legend
0-10 red
11 -20
21 -30
31 -40
41 -50
51 - 60 yellow
61 -70
71 -80
81 -90
91 - 100 green
City Limits
IMS Infrastructure Management Services 2020
ASHINGTON
Arbo
ke
KIN
INTER
4 I RPC)
S 112th St
1286
Bow
Lake
Plc
TE NATIO-P
1057
uwamish River
1440 1432 1435 1061 1431 1434 436
S 160th
S 164th
I
IIF I J
Foster Golf
Course Po
mish
9 Minkler Blvd
Lake
Washington
Black River
i
Tukwila, WAS Pavement Survey 2020
5
6
4.2 TUKWILA NETWORK CONDITION IMAGERY
The images presented below provide a sampling of the Tukwila streets that fall into the various condition
categories with a discussion of potential rehabilitation strategies.
Very Poor (PCI = 0 to 25) — Complete Reconstruction
62nd Avenue from 151st Street to South 151st Street (GISID 1004, PCI = 25) — Rated as Very Poor, this
street displays spreading base failure as evidenced by the severe alligator cracking and patching. It is
also worth noting that the patching along the left hand side of the street has severely deteriorated as
evident by the alligator cracking surrounding the patched areas. A mill and overlay on this street would
not be suitable as the base has failed and would not meet an extended service life of at least 15 years.
This street requires a full reconstruction and should be carefully monitored.
Deferral of reconstruction of streets rated as Very Poor will not cause a substantial decrease in pavement
quality as the streets have passed the opportunity for overlay -based strategies. Due to the high cost of
reconstruction, Very Poor streets are often deferred until full funding is available in favor of completing
more streets that can be rehabilitated at lower costs, resulting in a greater net benefit to the City. This
strategy however must be sensitive to citizen complaints forcing the street to be selected earlier. In
addition, this type of street can pose a safety hazard for motorists, since severe potholes and distortions
may develop. It is important to consistently monitor these streets and check for potholes or other
structural deficiencies until the street is eventually rebuilt.
IMS Infrastructure Management Services Tukwila_Report Page 15
7
Fair (PCI = 50 to 60) — Thin to Moderate Overlays
Interurban Avenue From Macadam Road to Gateway Drive (GISID 1998, PCI = 53) — Rated in the Fair
category, these streets require thin to moderate overlays for asphalt when they enter their need year
(generally within 2-3 points of the lower PCI in the defined range). Several distresses are present, but
tend to be more localized and moderate in severity, and non -load related (primarily longitudinal and
transverse cracking and raveling). On this segment of road, the signs of deterioration are evident in the
right hand travel lane of the pavement and are moderate in severity indicating the base has not yet failed
along the entire length of roadway. The curb line is straight through the sidewalk could benefit from some
preventative maintenance to prevent damage from weed intrusion.
Asphalt streets rated as Fair tend to receive a lower priority when developing a rehabilitation program. If
deferred, the rehabilitation cost would only increase by about $3 to $5/yd2, again depending on the
functional classification, in about 5 to 10 years. This delay represents a 20% difference over the time
stated. Thus, the cost of deferral is low when compared to deferring a thick overlay to a reconstruction
with a two to threefold increase in cost.
IMS Infrastructure Management Services Tukwila_Report Page 18
8
Tukwila, WA
Pavement Management Analysis Report
August, 2020
City of Tukwila, WA
Attn.: Bryce Corrigan,KPG Project Manager
3131 Elliott Avenue Suite 400
Tukwila, WA 98121
IMS Infrastructure Management Services
8380 S. Kyrene Rd., Suite 101, Tempe, AZ 85283
Phone: (480) 839-4347, Fax: (480) 839-4348
www.imsanalysis.com
Infrastructure Management Services
TABLE OF CONTENTS
1.0 EXECUTIVE SUMMARY & RECOMMENDATIONS 1
2.0 PRINCIPLES OF PAVEMENT MANAGEMENT 3
2.1 Pavement Preservation 3
2.2 Economic Impacts of Maintenance & Rehabilitation 5
3.0 THE PAVEMENT MANAGEMENT PROCESS 6
3.1 Functional Class Review 6
3.2 Assembly of Data into Projects 10
3.3 Field Survey Methodology 12
4.0 TUKWILA SURVEY PAVEMENT CONDITION 14
4.1 Understanding The Pavement Condition Index 14
4.2 Tukwila Network Condition Imagery 15
4.3 Evaluating the Pavement Quality and Backlog 22
4.4 Tukwila Network Condition Distribution 23
4.5 Condition By Functional Classification 27
4.6 Structural and Load Associated Distress Analysis 28
5.0 REHABILITATION PLAN AND BUDGET DEVELOPMENT 30
5.1 Key Analysis Set Points and Pavement Performance Curves 30
5.2 Fix All and Annual Estimates 34
5.3 Network Budget Analysis Models 36
5.4 Post Rehabilitation Condition 39
5.5 True Cost of Underfunding of a Roadway Network 42
5.6 Network Recommendations and Comments 43
APPENDED REPORTS Following Page 43
Appendix A
Appendix B
Appendix C
Appendix D
Street Inventory and Condition Summary
$1.05M Street Rehabilitation Program by Segment
$1.05M Street Rehabilitation Program by Year
Full -Sized Maps
IMS Infrastructure Management Services Tukwila_Report Page i
10
APPENDED MAPS Located on Thumb Drive
Functional Classification by Segment
Pavement Condition Index by Segment
Pavement Condition Rating by Segment Using Descriptive Terms
Assembled Projects
Pavement Condition Rating by Project Using Descriptive Terms
$1.05M/year Rehab Plan Budget
$1.05M/year Post Rehab PCI Map
IMS Infrastructure Management Services Tukwila_Report Page ii
11
Abbreviation
or Acronym
Definition
$k Dollars in thousands ($,000)
$M Dollars in millions
%SP Percent Spreadability - component of deflection analysis
AC Asphalt Concrete - asphalt streets, flexible pavements, also know n as ACP
ACP Asphalt Concrete Pavement - asphalt streets, flexible pavements, also know n as AC
ART Arterial roadway functional classification
ASTM American Society of Testing Methods
Avg Average
BCI Base Curvature Index - component of deflection analysis
Brk Break
CAL Coarse Aggregate Loss
CDV Corrected Deduct Value - part of the ASTM D6433 PCI calculation
COL Collector roadw ay functional classification
Crk Crack
DefICON Deflection Condition - structural load analysis based on traffic loading and deflection
DMD Dynamic Maximum Deflection - temperature corrected deflection
Dvdd Slab Divided Slab
DynaCON Dynamic Condition - structural layer analysis
ft or FT Foot
ft2 or FT2 Square foot
FunCL Functional Gassification
FWD Falling w eight deflectometer
GC! Gravel Condition Index
GFP Good - Fair - Poor
GIS Geographic Information System
GISID GIS segment identification number
H&V Horizontal and Vertical
IRI International Roughness Index
Jt Joint
L&T Longitudinal and Transverse
LAD Load associated distress
LOC Local roadw ay functional classification - same as RES
LOG Lip of Gutter
m Metre or meter
M Moderate
m2 square metre or square meter
MART Major arterial roadway functional classification
Max Maximum
Max DV Maximum Deduct Value
MCOL Major collector roadway functional classification
mi or M Mile
Ivan Minimum
MnART Minor arterial roadway functional classification
IvhCOL Minor collector roadway functional classification
MOD Moderate
NLAD Non -load associated distress
OCI Overall condition index, also know n as PCI
Olay Overlay
PART Primary arterial roadway functional classification
Pavetype Pavement Type
PCC Portland Cement Concrete - concrete streets
PCI Pavement Condition Index - generic term for OCI
R&R Remove and replace
RART Rural arterial roadw ay functional classification
PWF Priority Weighting Factor
Recon Reconstruction
Rehab Rehabilitation
RES Local roadw ay functional classification - same as LOC
RI or RCI Roughness Index
S Strong
SART Secondary arterial roadway functional classification
SCI Surface Curvature Index - componenent of deflection analysis
SDI Surface Distress Index
SI Structural Index
STA Station or chainage
Surf Trtmt Surface Treatment
TDV Total Deduct Value
W Weak
IMS Infrastructure Management Services Tukwila Report Page iii
12
1.0 EXECUTIVE SUMMARY & RECOMMENDATIONS
PROJECT SUMMARY
In 2020 IMS Infrastructure Management Services, LLC (IMS) was contracted by the City of Tukwila to
conduct a pavement condition assessment and analysis update on approximately 80.5 centerline miles of
City maintained asphalt roadways.
IMS mobilized their Laser Road Surface Tester (RST) to conduct an objective assessment using industry
standard pavement distress protocols such as those found in ASTM D6433-11. At that time, the City's
network average Pavement Condition Index was found to be a 66 and the City's backlog (roads below a
PCI of 40) was at only 1 %. See section 4 for more information
C&G & Drainage, 21.3,
15%
City of Tukwila, WA
Network Valuation (Asset, $M, %)
Sidewalks & Ramps, 24.2,
17%
Signs & Striping, 1.2, 1%
Landscaping, 1.2, 1%
Total Mileage = 80.5 Miles
Total Network Valuation = $145.1M
Cost Per Mile = $1802/Mile
Figure 1- Replacement Value of Roadway Network
As seen in Figure 1, Tukwila has just over 80 centerline miles of roadway, encompassing nearly 1.6M
square yards of pavement surfacing, which is predominantly asphalt. At an average replacement cost for
a typical roadway just over $1.8M per mile, not including the value of the land, the City has over $145M
invested in its paved roadway network.
IMS Infrastructure Management Services Tukwila_Report Page 1
13
SUMMARY METRICS OF HEALTH
Pavement Condition Index (PCI) — The PCI score is a ranking assessment on the overall health of a
pavement segment on a scale of 0 to 100. The network average PCI is a good global indicator of a
network's overall health. (Explained in section 4)
Percent of Excellent Roads — Roads with a condition category of Excellent are those that score
between a PCI of 85 to 100.
Backlog —Backlog is the Very Poor and Poor roads (between a PCI of 0 and 40) that represent a portion
of the network in need of extensive rehabilitation such as full and partial reconstruction. Using sound
pavement management and finance principles, a very healthy network will have a backlog of 10% or less.
Tukwila met two out of three of the metrics for evaluating the quality of its roadway network.
✓ Tukwila's network average pavement condition score is slightly above the national average
currently seen by IMS of 60 to 65, with the City's average scoring a 65.6.
o The number of streets rated Excellent is below the minimum recommended target of 15% at 6%
✓ The backlog amount is below the average value of 12% at 1.3%.
BUDGET SCENARIOS
See section 5 for more information
The current annual budget for Tukwila is $1.05M per year dedicated to pavement preservation and
rehabilitation. This will grow the backlog to 12% while reducing the average PCI to a 59 over 5 years.
Please note this number is an annual budget average across all 5 years of the analysis horizon.
The PCI control budget of $1.22M per year and will maintain the network average PCI at a 60 while
increasing the backlog to 11%.
EXECUTIVE SUMMARY CONCLUSION
The Tukwila network has an average PCI of 65.6 and a backlog of 1.3%, with most of the network landing
in the Very Good PCI range. With the City's existing budget, the network conditions will degrade into the
high 50s PCI range and backlog will continue to grow over time. It is worth noting that the City does have
a fair amount of streets approaching the end of their lifespan where overlays can be effective,
representing a percentage of the network at the steepest part of their deterioration curves.
IMS Infrastructure Management Services Tukwila_Report Page 2
14
2.0 PRINCIPLES OF PAVEMENT MANAGEMENT
2.1 PAVEMENT PRESERVATION
Preservation of existing roads and street systems has become a major activity for all levels of
government. Because municipalities must consistently optimize the spending of their budgets, funds that
have been designated for pavement must be used as effectively as possible. The best method to obtain
the maximum value of available funds is through the use of a pavement management system.
Pavement management is the process of planning, budgeting, designing, evaluating, and rehabilitating a
pavement network to provide maximum benefit with available funds.
A pavement management system is a set of tools or methods that assist decision makers in finding
optimal strategies for providing and maintaining pavements in a serviceable condition over a given time
period. The intent is to identify the optimum level of long-term funding to sustain the network at a
predetermined level of service while incorporating local conditions and constraints.
Pavement Quality
} rG rtnent
Very Good
Good
Fair
Marginal
Paor
Very Poet
/I 69o-drop in quality
in dC% of life
$1 Suvia view
Costs $8 if delayed
Off% drop in quality
In 1 b' of life
Time
Figure 2 — Pavement Deterioration and Life Cycle Costs
As shown as Figure 2, the streets that are repaired while in good condition will cost less over their lifetime
than those left to deteriorate to a poor condition. Without an adequate routine pavement maintenance
program, streets require more frequent reconstruction, thereby costing millions of extra dollars.
The key to a successful pavement management program is to develop a reasonably accurate
performance model of the roadway, and then identify the optimal timing and rehabilitation strategy. The
resultant benefit of this exercise is realized by the long term cost savings and increase in pavement
quality over time. As illustrated in Figure 2, pavements typically deteriorate rapidly once they hit a specific
threshold. A $1 investment after 40% lifespan is much more effective than deferring maintenance until
heavier overlays or possibly reconstruction are required just a few years later.
IMS Infrastructure Management Services Tukwila_Report Page 3
15
Once implemented, an effective pavement information management system can assist agencies in
developing long-term rehabilitation programs and budgets. The key is to develop policies and practices
that delay the inevitable total reconstruction for as long as practical yet still remain within the target zone
for cost effective rehabilitation. That is, as each roadway approaches the steepest part of its deterioration
curve, apply a remedy that extends the pavement life, at a minimum cost, thereby avoiding costly heavy
overlays and reconstruction. Figure 3 illustrates the concept of extending pavement life through the
application of timely rehabilitations.
Pavement Quality
Pavement Life Cycle Curve
Target Zone for Pavement Rehabilitation
#•'...Increased Pavement Life '•.
•k
•
•'•F
•
emeri# pert n}an
ce
Tim e
Figure 3 — Pavement Life Cycle Curve
Ideally, the lower limit of the target zone shown in Figure 3 would have a minimum PCI value in the 60 to
70 range to keep as many streets as possible requiring a thin overlay or less. The upper limit would tend
to fall close to the higher end of the Very Good category — that is a pavement condition score
approaching 85. Other functions of a pavement management system include assessing the effectiveness
of maintenance activities, new technologies, and storing historical data and images.
For Tukwila, a prioritization methodology based on pavement condition, pavement materials, functional
class, and strength rating was used to analyze the network condition and develop the proposed 5 year
rehabilitation plan.
The analysis methodologies and data collection technologies were based on ASTM D6433 Standard
Practice for Roads and Parking Lots Pavement Condition Index Surveys (hereinafter ASTM D6433) for
assessment of pavement surface condition and the International Roughness Index (IRI) for quantification
of pavement roughness on all City streets. These measurements of pavement quality are combined to
form an overall 0 to 100 Pavement Condition Index (PCI), with 100 being the best.
IMS Infrastructure Management Services Tukwila_Report Page 4
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2.2 ECONOMIC IMPACTS OF MAINTENANCE & REHABILITATION
The role of the street network as a factor in the City's well-being cannot be overstated. In the simplest of
terms, roadways form the economic backbone of a community. They provide the means for goods to be
exchanged, commerce to flourish, and commercial enterprises to generate revenue. As such, they are an
investment to be maintained.
The overall condition of an agency's infrastructure and transportation network is a key indicator of
economic prosperity. Roadway networks, in general, are one of the most important and dynamic sectors
in the global economy. They have a strong influence on not only the economic well-being of a community,
but a strong impact on quality of life. Well -maintained road networks experience multiple socioeconomic
benefits through greater labor market opportunities and decreasing income gap.
As a crucial link between producers and their markets, quality road networks ensure straightforward
access to goods and drive global and local economies. Likewise, higher network quality has a strong
correlation to improvements in household consumption and income. Roads also act as a key element to
social cohesion by acting as a median for integration of bordering regions. This social integration
promotes a decreased gap in income along with diversity and a greater sense of community that can play
a large role in decreasing rates of poverty.
Conversely, deterioration of roads can have adverse effects on a community and may bring about
important and unanticipated welfare effects that the governments should be aware of when cutting
transportation budgets. Poor road conditions increase fuel and tire consumption while shortening intervals
between vehicle repair and maintenance. In turn, these roads result in delayed or more expensive
deliveries for businesses and consumers. Economic effects of poor road networks, such as time
consuming and costly rehabilitation, can be reduced if a proactive maintenance approach is successfully
implemented. To accomplish this, a pavement assessment and analysis should be completed every few
years in an effort update the budget models and rehabilitation plans. As shown below, the IMS Laser
Road Surface Tester (featured in Figure 4) was mobilized to Tukwila to conduct an objective survey.
Figure 4 — Laser Road Surface Tester (RST)
IMS Infrastructure Management Services
Tukwila_Report
Page 5
17
3.0 THE PAVEMENT MANAGEMENT PROCESS
3.1 FUNCTIONAL CLASS REVIEW
As part of the scope of this assignment, the functional classification designations currently used in the
Tukwila pavement management program were adopted for their use in the pavement analysis.
Although there is no uniform standard for classifying pavement into functional classes, The Federal
Highway Administration (FHWA), American Public Works Association (APWA) and Institute of
Transportation Engineers (ITE) offer some broad guidelines on how to assign classifications that were
followed in this study.
The City's functional classification definitions used in the assessment are as follows:
1. Principal Arterial (PART) — all cross City corridors consisting of 2 to 4 or more lanes, generally
spaced at 1 mile intervals with daily traffic counts generally exceeding 20,000 vehicles per day.
Major cross City corridors with a landscaped median were also assigned to Principal Arterials.
2. Minor Arterial (MnART) — Continuous and discontinuous cross city and inter -district corridors
that are 2 to 4 lanes across and generally have a centerline stripe or a designated bus route. The
ADT generally falls in the 10,000 to 20,000 vehicle per day range. They are typically spaced on
the 1/2 or mile section line and on occasion, may have a short non -landscaped median.
3. Collector (COL) — Continuous and discontinuous cross City and inter -district corridors that are 2
to 4 lanes across and generally have a centerline stripe or a designated bus route. The ADT
generally falls in the 1,000 to 10,000 vehicle per day range. They are typically spaced on the 1/2 or
1/4 mile section line and on occasion, may have a short non -landscaped median. Major collectors
are also assigned to streets segments leading to, or adjacent to, a major traffic generator site
such as a regional shopping complex. Collectors form the entrance to communities and may have
a decorative landscaped median of short duration.
4. Local (LOC) — These are the majority of the street segments consisting of all residential roads
not defined above or as industrial/commercial.
IMS Infrastructure Management Services Tukwila_Report Page 6
18
The paved roadway network consists of 4 functional classes, covering approximately 80.5 miles of
pavement. The average pavement condition index (PCI) of the roadway network is a 65.6 and the
network's primary pavement type is asphalt. The following table and Figure 5 summarize the functional
classification splits within the system.
City of Tukwila, WA
Network Summary by Functional Class
}
tf.
Y i3 s"
i
Co
z a ` a a Uo
Segment (Block) Count All Streets 772 88 106 119 460
Asphalt 772 88 106 11 B 460
Network Length (It): All Streets 424,955 68,822 75,039 65,880 215,214
Asphalt 424,955 68,822 75,039 65,880 215,214
Network Length (mi): All Streets 80.5 13.0 14.2 12.5 40,8
Asphalt 80.5 13.0 14.2 12.5 40.8
Average Width (ft): All Streets 34.1 55.5 41.3 33.5 24.9
Asphalt 34.1 55.5 41.3 33.5 24.9
Network Area (yd2): All Streets 1,610,389 424,563 344,088 245,128 596,590
Asphalt 1,610,369 424,563 344,088 245,128 596,590
Current Pavement Condition All Streets 66 65 67 63 65
Index (CPU) Asphalt 66 65 67 63 65
Pavement Condition Index All Streets 66 66 68 64 65
(Surveyed PCI) Asphalt 66 66 68 64 65
Current Backlog (%) All Streets 1 Percentage of Network with a PCI 40
Current Network Index All Streets 65 Managable Network Index
Surface Distress Index (SDI) All Streets 65 60 65 63 69
7116/20 Asphalt 65 60 66 63 69
Roughness Index (RI) All Streets 66 76 70 65 58
7716120 Asphalt 66 76 70 65 58
IMS Infrastructure Management Services Tukwila_Report Page 7
19
City of Tukwila, WA
Functional Classification Distribution By Area (FunCL, 000's Sq Yds,%)
Principal Arterial, 424.6,
26%
Collector, 245.1, 15%
_Minor Arterial, 344.1,
22%
Figure 5 — Functional Class Distribution by Mileage
Total Mileage=80.5 Miles
Total Area =1610k Sq Yards
As discussed later in this report, the functional classifications also play a critical role in the rehabilitation
candidate selection process as Arterials are generally given preference over other rehab candidates due
to their higher traffic counts and steeper deterioration curves.
IMS Infrastructure Management Services Tukwila Report Page 8
20
The following figure (Figure 6) highlights the functional classifications used for the Tukwila roadway
network. An electronic version of this map is appended to this report.
Pc,v rti r1t A nn!ysis
"Liiuruf'..
r . 1e2.nerli
f 1 F.TA. WA
41/eflif
Figure 6 — Tukwila Functional Classification Designation
IMS Infrastructure Management Services Tukwila_Report Page 9
21
3.2 ASSEMBLY OF DATA INTO PROJECTS
Tukwila's Geographic Information System (GIS) was used as the basis for segmenting the roadway
network on a block -by -block basis. Each segment was assigned a unique identifier referred to as a
GISID, establishing a one-to-one relationship between the GIS and the street inventory. The segments
form the basic building block of the pavement management system and are where all attribute and
condition data are stored.
The centerline segments were aggregated together within the pavement management system to form
logical projects that the analysis and rehabilitation program are developed against.
• Arterial projects run from major intersection to major intersection up to 1 mile in length.
• Similar to arterials, collector streets within a neighborhood were aggregated together to form a
single project where practical.
• Local streets along a homogenous route were aggregated together along with adjacent side
streets to form a small neighborhood based approach.
Segments were joined only when the pavement condition and functional classification were
homogeneous in nature such that when joined they have a relatively uniform condition that may be
rehabilitated using a single strategy.
The following figure (Figure 7) highlights the projects, used for the analysis. An electronic version of this
map is appended to this report.
IMS Infrastructure Management Services Tukwila_Report Page 10
22
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Pavement Analysts
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Figure 7 — Tukwila Assembled Projects
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3.3 FIELD SURVEY METHODOLOGY
Following a set of predefined assessment protocols matching the pavement management software
(ASTM D6433), a specialized piece of survey equipment — referred to as a Laser Road Surface Tester
(Laser RST, pictured on page 5) — is used to collect observations on the condition of the pavement
surface, as well as collect high definition digital imagery and spatial coordinate information. The Laser
RST surveys each local street from end to end in a single pass, while all other roadway classifications are
completed in two passes.
Key pavement condition data elements collected by the Laser RST include:
Surface Distress Index — The Laser RST collects surface distress observations based on the extent and
severity of distresses encountered along the length of the roadway following ASTM D6433 protocols for
asphalt and concrete pavements. The surface distress condition (cracking, potholes, raveling, and the
like) is considered by the traveling public to be the most important aspect in assessing the overall
pavement condition.
Presented on a 0 to 100 scale, the Surface Distress Index (SDI) is an aggregation of the observed
pavement defects. Within the SDI, not all distresses are weighted equally. Certain load associated
distresses (caused by traffic loading), such as rutting or alligator cracking on asphalt streets, or divided
slab on concrete streets, have a much higher impact on the surface distress index than non -load
associated distresses such as raveling or patching. Even at low extents and moderate severity — less
than 10% of the total area — load associated distresses can drop the SDI considerably. ASTM D6433 also
has algorithms within it to correct for multiple or overlapping distresses within a segment.
For this project, extent and severity observations were collected, processed, and loaded into the
pavement management software. Within the software, the following distresses, listed in order from
greatest to lowest impact, are presented as a 0 to 10 rating for review and reporting:
• Alligator Cracking — Alligator cracking is quantified by the severity of the failure and number of
square feet. Even at low extents, this can have a large impact on the condition score as this
distress represents a failure of the underlying base materials.
• Wheel Path Rutting — Starting at a minimum depth of '/4 inch, wheel path ruts are quantified by
their depth and the number of square feet encountered. Like alligator cracking, low densities of
rutting can have a large impact on the final condition score.
• Longitudinal, Transverse, Block (Map), and Edge Cracks — These are quantified by their length
and width. Longitudinal cracks that intertwine are the start of alligator cracking.
• Patching — Patching is quantified by the extent and quality of patches. When the majority of a
roadway surface is covered by a patch, such as a large utility replacement, the rating of the patch
is minimized. All potholes are rated as patches.
• Distortions — All uneven pavement surfaces, such as depressions, bumps, sags, swells, heaves,
and corrugations, are included as distortions and are quantified by the severity and extent of the
affected area.
• Raveling — Raveling is the loss of fine aggregate materials on the pavement surface and is
measured by the severity and number of square feet affected.
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• Bleeding — Bleeding is the presence of free asphalt on the roadway surface caused by too much
asphalt in the pavement or insufficient voids in the matrix. The result is a pavement surface with
low skid resistance and is measured by the amount and severity of the area.
• Similar distresses were collected for concrete streets including divided slab, corner breaks, joint
spalling, faulting, polished aggregate, and scaling.
Roughness Index — Roughness is recorded following the industry standard "International Roughness
Index" (IRI), a measure of the change in elevation over a distance expressed as a slope and reported in
millimeters/meter. The IRI value is converted to a 0 to 100 score and reported as the Roughness Index
(RI) as follows:
RI = (11 — 3.5 x In(IRI)) x 10
In(IRI) is the natural logarithm of IRI.
In common terms, a newer street would generally have a Roughness Index above 85, while one due for
an overlay would be in the range 40 to 70. Failed streets typically have roughness values below 40.
Structural Index — The network of streets was not tested for structural adequacy, instead, the
relationship between the final pavement condition score and amount of load associated distresses was
analyzed and each pavement section assigned a Weak, Moderate or Strong strength rating. The
assigned structural index (30, 60 or 80 for weak, moderate and strong respectively) was not used in
determining the overall pavement condition score, but simply to classify the pavement strength and aid in
selecting appropriate rehabilitation strategies.
Pavement Condition Index (PCI) — Following our field surveys, the condition data is assembled to create
a single score representing the overall condition of the pavement. The Pavement Condition Index (PCI) is
calculated as follows:
PCI = 33% Roughness Index + 67% Surface Distress Index
Development of the pavement management plan and budgets were completed using Tukwila - specific
rehabilitation strategies, unit rates, priorities, and pavement performance curves. The process was
iterative in its attempt to obtain the greatest efficiency and cost benefit.
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4.0 TUKWILA SURVEY PAVEMENT CONDITION
4.1 UNDERSTANDING THE PAVEMENT CONDITION INDEX
The following compares the Pavement Condition Index (PCI) to commonly used descriptive terms.
Divisions between the terms are not fixed, but are meant to reflect common perceptions of condition.
100 -
Pavement Condition Index (PCI)
90 -
80 -
70
60
50
40
30 -
20 -
City of Tukwila, WA
Pavement Condition Definitions Using Common Terms
Excellent - Routine and preventative maintenance, some crack
and joint sealing, loca€zed repairs
Very Good - Surface treatments (slurry, micro surface, chip seals),
PCC loca €lzed remove and replace, crack seal and joint sealing
Good - Surface treatments with localized repair to thin overlays,
PCC slight panel replacement
Fair - Thin to moderate overlays with some remove and replace,
PCC moderate panel replacement
Marginal - Progressively thicker overlays with remove and
replace, PCC extensive panel replacement
Poor -Thick overlays to partial reconstruction {surface removal,
compaction, overlay), PCC extensive panel replacement and grinding
Very Poor- Full reconstruction and base stabilization
10 -
0
0 5 10 15 20 25 30 35 40 45 50
Time (Years)
Figure 8 — Understanding the Pavement Condition Index (PCI) Score
The following table details a general description for each of these condition levels with respect to
remaining life and typical rehabilitation actions:
Relative Remaining
PCI Range Description Life Definition
85 — 100 Excellent 15 to 25 Years Like new condition — little to no maintenance required when
new; routine maintenance such as crack and joint sealing.
70 — 85 Very Good 12 to 20 Years Routine maintenance such as patching and crack sealing with
surface treatments such as seal coats or slurries.
60 — 70 Good 10 to 15 Years Heavier surface treatments, chip seals and thin overlays.
Localized panel replacements for concrete.
40 — 60 Marginal to Fair 7 to 12 Years Heavy surface -based inlays or overlays with localized repairs.
Moderate to extensive panel replacements.
25 — 40 Poor 5 to 10 Years Sections will require very thick overlays, surface replacement,
base reconstruction, and possible subgrade stabilization.
0 — 25 Very Poor 0 to 5 Years High percentage of full reconstruction.
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4.2 TUKWILA NETWORK CONDITION IMAGERY
The images presented below provide a sampling of the Tukwila streets that fall into the various condition
categories with a discussion of potential rehabilitation strategies.
Very Poor (PCI = 0 to 25) — Complete Reconstruction
62nd Avenue from 151st Street to South 151st Street (GISID 1004, PCI = 25) — Rated as Very Poor, this
street displays spreading base failure as evidenced by the severe alligator cracking and patching. It is
also worth noting that the patching along the left hand side of the street has severely deteriorated as
evident by the alligator cracking surrounding the patched areas. A mill and overlay on this street would
not be suitable as the base has failed and would not meet an extended service life of at least 15 years.
This street requires a full reconstruction and should be carefully monitored.
Deferral of reconstruction of streets rated as Very Poor will not cause a substantial decrease in pavement
quality as the streets have passed the opportunity for overlay -based strategies. Due to the high cost of
reconstruction, Very Poor streets are often deferred until full funding is available in favor of completing
more streets that can be rehabilitated at lower costs, resulting in a greater net benefit to the City. This
strategy however must be sensitive to citizen complaints forcing the street to be selected earlier. In
addition, this type of street can pose a safety hazard for motorists, since severe potholes and distortions
may develop. It is important to consistently monitor these streets and check for potholes or other
structural deficiencies until the street is eventually rebuilt.
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Poor (PCI = 25 to 40) — Last Opportunity for Surface Base Rehabilitation
Boeing Access Road from Martin L King Jr Ramp to Martin L King Way (GISID 1975, PCI = 35) —
Rated as Poor, this segment still has some remaining life before it becomes a critical reconstruction need.
As evident in the imagery, most of the cracks have been properly sealed. On this street, the base is
showing signs of failure in areas exhibiting alligator/fatigue cracking. The severely cracked areas are
isolated and do not persist throughout the entire segment length and cross section. These areas should
be dug out and structurally patched to attain the maximum life from any potential rehabilitation efforts. If
left untreated, within a short period of time, a full reconstruction would be required.
On arterial roadways, Poor streets often require partial to full reconstruction — that is removal of the
pavement surface and base down to the subgrade and rebuilding from there. On local roadways, they
require removal of the pavement surface through grinding or excavation, base repairs, restoration of the
curb line and drainage, and then placement of a new surface.
In general, the service life of Poor streets is such that if deferred for too long, it would require a more
costly reconstruction. Streets rated as Poor are typically selected first for rehabilitation as they provide the
greatest cost/benefit to the City — that is the greatest increase in life per rehabilitation dollar spent.
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Marginal (PCI = 40 to 50) — Progressively Thicker Overlays
Fun Center Way from East Interurban Avenue to South West Grady Way (GISID 1364, PCI = 48) —
Rated as marginal with a PCI score at the lower range between Marginal and Poor streets. Marginal
streets have distresses that tend to be localized and moderate in nature — that is they do not extend the
full length of the segment and can be readily dug out and repaired. This street segment highlights this
characteristic as the failed area does not quite extend the full length or width of the roadway and is still
serviceable. However, it also highlights the relationship between base and pavement quality. Placing an
overlay on this street without repairing the base would not achieve a full 15 year life as the failure would
continue to occur over time. Structural patching of the failed areas along localized rehabs would permit a
full width grind and inlay on this street segment and return it to full service. The curb lines are straight
and drainage is functioning well.
Marginal streets that display high amounts of load associated distresses are selected as a priority for
rehabilitation as they provide the greatest cost/benefit to the City. If left untreated, Marginal streets with
high amounts of load associated distresses would deteriorate to become partial reconstruction
candidates. Marginal streets that are failing due to materials issues or non -load associated failures may
become suitable candidates for thick overlays if deferred, without a significant cost increase.
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Fair (PCI = 50 to 60) — Thin to Moderate Overlays
Interurban Avenue From Macadam Road to Gateway Drive (GISID 1998, PCI = 53) — Rated in the Fair
category, these streets require thin to moderate overlays for asphalt when they enter their need year
(generally within 2-3 points of the lower PCI in the defined range). Several distresses are present, but
tend to be more localized and moderate in severity, and non -load related (primarily longitudinal and
transverse cracking and raveling). On this segment of road, the signs of deterioration are evident in the
right hand travel lane of the pavement and are moderate in severity indicating the base has not yet failed
along the entire length of roadway. The curb line is straight through the sidewalk could benefit from some
preventative maintenance to prevent damage from weed intrusion.
Asphalt streets rated as Fair tend to receive a lower priority when developing a rehabilitation program. If
deferred, the rehabilitation cost would only increase by about $3 to $5/yd2, again depending on the
functional classification, in about 5 to 10 years. This delay represents a 20% difference over the time
stated. Thus, the cost of deferral is low when compared to deferring a thick overlay to a reconstruction
with a two to threefold increase in cost.
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Good (PCI = 60 to 70) — Surface Treatments to Thin Overlays
Macadam Road from 149th Lane to 150th Street (GISID 2064, PCI = 62) — Rated as Good with the
primary cause of deterioration the transverse and longitudinal cracking, as well as patching. It also
displays small amounts of load associated distresses that can easily be removed to restore the visual
appearance of the roadway. The existing cracks should be sealed and the pavement surface restored,
with a heavier surface treatment such as microsurfacing or double slurry to fully waterproof the pavement
and cover the crack sealant. The occasional dig out and replacement may be required to correct
localized deficiencies. Alternatively, depending on the extent of the distressed areas, base strength and
drainage, a thin overlay may be applied.
Asphalt streets rated as Good are ideal candidates for thinner surface -based rehabilitations and local
repairs. Depending on the amount of localized failures, a thin edge mill and overlay, or possibly a surface
treatment, would be a suitable rehabilitation strategy for streets rated as Good. Streets that fall in the high
60 - low 70 PCI range provide the greatest opportunity for extending
pavement life at the lowest possible cost, thus applying the principles
of the perpetual life cycle approach to pavement maintenance. The
adjacent photo is a great example of a street segment (not a Tukwila
Road) that displayed low load associated distresses and thus, high
structural characteristics, and once the distressed areas were
replaced, a slurry seal was applied. The patching accounted for less
than 5 to 10% of the total area and resulted in a good looking,
watertight final surface at a much lower cost than an overlay with less
disruption to the neighborhood and curb line. The patches were
paver laid and roller compacted.
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Very Good (PCI = 70 to 85) — Surface Treatments and Localized Rehabilitation
West Valley Highway from Strander Boulevard to 180th Street (GISID 1293, PCI = 73) — Rated as
Very Good, this road displays minor amounts of transverse cracking and patching. The surface is non -
weathered, and the base is still strong. This street is an example of a candidate for preventative
maintenance and light weight surface treatments to extend the life of a roadway.
Asphalt streets rated as Very Good generally need lightweight surface -based treatments such as surface
seals, slurries, chip seals or microsurfacing. Routine maintenance such as crack sealing and localized
repairs often precede surface treatments. The concept is to keep the cracks as waterproof as possible
through crack sealing and the application of a surface treatment. By keeping water out of the base layers,
the pavement life is extended without the need for thicker rehabilitations such as overlays or
reconstruction. Surface treatments also tend to increase surface friction and visual appearance of the
pavement surface but do not add structure or increase smoothness.
Surface treatments may include:
• Double or single application of slurry seals (slurries are a sand and asphalt cement mix).
• Microsurfacing — asphalt cement and up to 3/8 sand aggregate.
• Chip seals and cape seals (Chip seal followed by a slurry).
Additional cost benefits of early intervention include:
• Less use of non-renewable resources through thinner rehabilitation strategies.
• Less intrusive rehabilitation and easier to maintain access during construction.
• Easier to maintain existing drainage patterns.
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Excellent (PCI = 85 to 100)
Southcenter Parkway (GISID 1343, PCI = 93) — Rated as Excellent, displaying little to no surface
distresses. The ride is smooth and the surface is non -weathered and the base is strong. In a couple of
years, this street segment would be an ideal candidate for routine maintenance activities such as crack
sealant rehabilitation.
In terms of pavement management efficiency, a program based on worst -first, that is starting at the lowest
rated street and working up towards the highest, does not achieve optimal expenditure of money.
Generally, under this scenario, agencies can not sufficiently fund pavement rehabilitation and lose ground
despite injecting large amounts of capital into the network.
The preferred basis of rehabilitation candidate selection is to examine the cost of deferral of a street,
against increased life expectancy.
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4.3 EVALUATING THE PAVEMENT QUALITY AND BACKLOG
The concept of the Pavement Condition Index (PCI) score, backlog percentage and number of streets
rated as Excellent must be fully understood in order to understand and develop an effective pavement
management program. These three metrics should fall into certain ranges in order to measure the quality
and long term viability of a network.
The PCI score indicates the overall pavement condition and represents the amount of equity in the
system; it is the value most commonly considered when gauging the overall quality of a roadway network.
It may also be used to define a desired level of service: that is, an agency may wish to develop a
pavement management program such that in five years the overall network score meets a set minimum
value. Obviously, the higher the PCI score the better off the overall network condition is. Agencies with
an average PCI score above 80 (when considering surface distress, roughness and possibly strength) are
rare and found only in a few select communities. Less than 1 in 20 communities surveyed by IMS have
that high of a condition average. Averages between 65 and 80 are indicative of either newer networks, or
ones that have an ongoing pavement rehabilitation program and tend to be fully funded. Scores between
60 and 65 are common and represent a reasonable average providing a satisfactory balance between
levels of service and funding, and when taken with the other two metrics may represent a well -managed
and funded network. A minimum score of 60 means that overall the network falls at the lower end of the
range where light weight surface treatments and thin overlays are the standard rehabilitation practice.
Below a 60 means an agency has to rely on more costly rehabilitations and reconstructions to address
condition issues.
At the upper end of the condition scale, a minimum of 15% of the network should be rated as Excellent.
Generally, at or above 15%, means that a noticeable percentage of the roadway network is in like new
condition, requiring only routine maintenance. While higher percentages of streets rated as Excellent are
certainly desirable, the annual cost to maintain rates at higher multiples is often cost prohibitive. Below
15% means the agency is struggling to effectively rehabilitate their network on an annual basis. The 15%
marker represents a cost effective balance between annual investment and satisfactory level of service.
Backlog roadways are those that have dropped sufficiently in quality to the point where surface based
rehabilitation efforts would no longer prove to be cost effective. These roadways are rated Poor or Very
Poor and will require either partial or total reconstruction. Backlog is expressed as the percentage of
roads requiring reconstruction as compared to the network totals.
It is the backlog, however, that defines the amount of legacy work an agency is facing and is willing to
accept in the future. It is the combination of the three metrics that presents the true picture of the
condition of a roadway network, and conversely defines improvement goals.
Generally, a backlog of 10% to 15% of the overall network is considered manageable from a funding point
of view with 12% being a realistic target. Fifteen percent (15%) is used as a control limit to indicate the
maximum amount of backlog that can be readily managed. Backlog rates below 10%, again are certainly
desirable, but financially unachievable for a large percentage of agencies. Backlogs approaching 20% or
more tend to become unmanageable, unless aggressively checked through larger rehabilitation
programs, and will grow at an alarming rate. At 20% a tipping point has been met and the backlog tends
to increase faster than an agency's ability to reconstruct their streets.
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4.4 TUKWILA NETWORK CONDITION DISTRIBUTION
Figure 9 presented below shows the distribution of pavement condition for the roadway network in
Tukwila. The average PCI for the network is 65.6. While direct comparisons to other agencies are difficult
due to variances in ratings systems, Tukwila is slightly above average when compared to other agencies
recently surveyed by IMS, which typically fall in the 60 to 65 range.
Percentage of Network by Area
30
25
20
15
10
5
0
City of Tukwila, WA
Current Pavement Condition Index (PCI) Distribution byArea
Current Network Average Condition =65.6, Backlog=1.3%
0to10 10to20 20to30 30to40
40 to 50 50 to 60
60 to 70 70 to 80 80 to 90 90 to 100
Pavement Condition Index (PCI)
Figure 9 — Roadway Network Present Status
Current FCI Late= 7/16/2020
• This is reflective of a moderately aged network that has had some roadway renewal effort.
• Simultaneously, the City has a moderate sample of streets that are approaching the end of their
life where surface based rehabilitations, such as overlays, can be effective.
• Traditionally we expect to see a bell curve that is skewed to the right and centered between a PCI
of 60 and 70. The Tukwila network curve illustrated above follows this norm and shows the
positive impact of recent roadway renewal effort over the last several years.
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The following graph (Figure 10) plots the same pavement condition information, but instead of using the
actual Pavement Condition Index (PCI) value, descriptive terms are used to classify the roadways.
• Six percent (6%) of the network can be considered in Excellent condition and require only routine
maintenance.
l4
d
m
• Thirty-two percent (32%) of the network falls into the Very Good classification. These are roads
that benefit most from preventative maintenance techniques such as microsurfacing, slurry seals
and localized panel repairs.
• Thirty-two percent (32%) of the streets are rated as Good and are candidates for lighter surface -
based rehabilitations such as thin overlays or slight panel replacements.
• Twenty-four percent (34%) of network can be considered Fair to Marginal condition representing
candidates for progressively thicker overlay -based rehabilitation or panel replacements. If left
untreated, they will decline rapidly into reconstruction candidates.
• The remaining one percent (1%) of the network is rated as Poor or Very Poor, meaning these
roadways have failed or are past their optimal due point for overlay or surface -based
rehabilitation and may require progressively heavier or thicker forms of rehabilitation (such as
extensive panel replacement, surface reconstruction or deep patch and paving) or total
reconstruction.
35
30
25
20
5
0
City of Tukwila, WA
Current Pavement Condition Rating Using DescriptiveTerms
Current Network Average Condition =65.6, Backlog=1.3%
V Po or(0 to 25) Poor (25 to 40) Marginal (40 to 50) Fair (50 to 60) Good (60 to 70) V Good (70 to 85) Excellent (85 to 100)
Current Pavement Condition Using Descriptive Terms Curre nt FCI Late= 7/16/20
Figure 10 — Roadway Network Present Status Using Descriptive Terms
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Figures 11 and 12 present the surveyed condition of the streets using PCI and Good -Fair -Poor
descriptive terms, respectively. Electronic versions of these maps are appended to this report.
Pnvomonr A: iulysu
R.
a rrx'ni.I:ka.
Figure 11 — Tukwila by Segment Using Pavement Condition Index (PCI)
/MS Infrastructure Management Services Tukwila_Rcport Page 25
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F.gvenlenl Analysis
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Figure 12 — Tukwila Pavement Condition by Segment Using Descriptive Terms
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4.5 CONDITION BY FUNCTIONAL CLASSIFICATION
Figure 13 highlights the pavement condition distribution for the arterial, collector, and local streets. Keep
in mind that arterial roadways, the streets that have the majority of traffic use and link various parts of the
city together, may be considered the thoroughfares of the city and during the budget development
process, should receive the highest priority when selecting rehabilitation candidates.
• The principal arterial network has an average PCI of 65
• The minor arterial network has an average PCI of 67
• The collector network has an average PCI of 63
• The local network has an average PCI of 65
45
40
35
m 30
a
CO
Y 25
O
O ▪ )
20
0
O)
by
▪ 15
a
10
City of Tukwila, WA
Current Pavement Condition Rating Using DescriptiveTerms
By Functional Class
• Principal Arterial, PCI = 65
• Minor Arterial, PCI =67
• Collector, PCI = 63
Local, PCI =65
V Poor(0 to 25) Poor (25 to 40) Marginal (40 to 50) Fair(50 to 60) Good (60 to 70) V Good (70 to 85) Excellent (85 to 100)
Pavement Condition Using Descriptive Terms
Figure 13 — Condition Rating by Functional Classification
Current FCI Late= 7/16/20
/MS Infrastructure Management Services Tukwila_Report Page 27
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4.6 STRUCTURAL AND LOAD ASSOCIATED DISTRESS ANALYSIS
Structural testing and analysis was not performed for the City of Tukwila. Instead, analysis of the cause
of pavement failure for these street segments was completed by examining the types of distresses that
have caused the PCI score to drop.
Surface distresses may be categorized into two classifications — load associated distresses (LADD) and
non -load associated distresses (NLAD). Load associated distresses are those that are directly related to
traffic loading and structural capacity. Non -load associated distresses are those that result from materials
or environmental issues including shrinkage (transverse) cracking, bleeding and raveling. Generally, load
associated distresses affect the overall condition score more than non -load associated distresses — as is
the case in Tukwila. For asphalt streets, roadways were classified as Weak, Moderate, or Strong.
The purpose of the structural analysis is twofold:
• The structural analysis provides input into which performance curve each segment is to use —
performance curves are used to predict pavement deterioration over time.
• Structural analysis assists in rehabilitation selection by constraining inadequate pavement
sections from receiving too light of a rehabilitation and conversely, identifying segments suitable
for lighter weight treatment.
Figure 14 plots the relationship of the load associated distresses (shown in red) against pavement
condition. As can be seen from the plot, at higher PCI scores, most pavements fall into the moderate
strength classification as the distresses have not yet begun to manifest themselves into severe failures.
As the PCI score drops, the load associated distresses typically affect the PCI score to a higher degree
with more segments being classified as weak. Conversely, segments that have a declining PCI score
and low LADD, are classified as strong as they display few load associated failures. High PCI score
(above 60) rehab selections should focus on pavement preservation activities such as surface treatments
or thin overlays, possibly with some localized pavement repairs and crack sealing.
The sum of the Load -Associated Distress deducts (LADD) is also used to qualify the appropriate
rehabilitation strategy selection in addition to the overall pavement condition score. For example, a street
that has a good PCI score (that is between 60 and 70) and is displaying relatively low load associated
distress deducts would be a suitable candidate for a surface treatment in place of a thin overlay in that the
PCI score is more influenced by materials issues such as transverse cracking or raveling.
Overall, the low amounts of streets exhibiting weak performance can generally be attributed to poor
subgrade conditions, insufficient pavement thickness and increased traffic loading — in particular heavy,
side -loading garbage and recycling trucks (an unintended consequence of green initiatives) along with
school buses and delivery vehicles. The average weight of these vehicles coupled with tire pressure and
configuration today compared to those from a few decades ago has increased drastically.
IMSInfrastructure Management Services Tukwila_Report Page 28
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• The upper black diagonal line identifies segments that have a high ratio of load associated
distresses compared to their PCI score. These segments are classified as weak.
• The lower black diagonal line identifies segments that have a low ratio of load associated
distresses compared to their PCI score and are classified as strong.
• Segments that fall between the two lines are assigned a moderate pavement strength.
The sum of the Load -Associated Distress deducts (LADD) is also used to qualify the appropriate
rehabilitation strategy selection in addition to the overall pavement condition score.
Sum of Distress Deducts (LADD)
100
90
80
70
60
50
40
30
20
10
0
0
V Poor
-
Pavement
Poor
Condition
'
Marginal
City of
Index Versus
I Fair
Tukwila,
Sum of Load
I Good
WA
Load Associated
I V Good
Excellent
Distress Deducts
1
Moderate Pavements •
Weak Pavements
Load Associated
Distress Dedu
is (LADD)
-
Strong Pavements
10
20
30
40 50 60
Pavement Condition Index (PCI)
70
80
Figure 14 — Pavement Condition Index versus Sum of Distress Deducts
90 100
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5.0 REHABILITATION PLAN AND BUDGET DEVELOPMENT
5.1 KEY ANALYSIS SET POINTS AND PAVEMENT PERFORMANCE CURVES
Pavement management analysis requires user inputs in order to complete its condition forecasting and
prioritization. A series of operating parameters were developed in order to create an efficient program
that is tailored to the City's needs.
Some of the highlights include:
• The pavement performance curves that are used to predict future pavement condition. Asphalt
streets are classified as weak, moderate, or strong, and then assigned the appropriate pavement
performance curve based on their functional classification to use in the analysis. The concept of
load associated distresses does not apply to concrete streets.
• The shape of performance curves reflect the concept of deferred maintenance and salvage life.
Instead of dropping to an absolute PCI value of 0 after 40 years of service, the curves are
designed to become asymptotic to the age axis and have a whole life of approximately 50 to 60
years depending on pavement type. This indicates the notion that once a street deteriorates past
a specific threshold — about a PCI of 20, age becomes less important in rehab selection.
• Priority ranking analysis uses prioritization for rehabilitation candidate selection. It is designed to
capture as many segments in their need year based on the incremental cost of deferral. The
higher the functional classification of a street, the higher priority a segment is given.
Rehabilitation Strategies and Unit Rates
The rehab strategies and unit rates used in the pavement analysis can be found on the following page.
Some important parameters include:
• Rehab Code and Activity — The assigned identifier and name to each rehabilitation strategy.
The term "RR" refers to "Remove and Replace", otherwise known as Structural Patching. When
this term is present, additional funds have been assigned to the strategy to allow for an increased
amount of preparation work and patching. The relative terms of thin, moderate and thick are
used to describe the overlay thickness. This is to facilitate consistency in the naming convention,
but does not imply the same material thickness has to be used for each functional classification.
The recommended rehab activities for any given PCI range may vary due to pavement strength
and functional classification. For example, an arterial between a PCI of 50 to 60 may receive a
thin to moderate overlay, while a local access road may only receive a chip seal or thin overlay.
• Unit Rates — The rehab costs are presented on a per square yard basis for each pavement type,
functional class, and rehabilitation activity combination. The rates were developed using typical
national averages for similar activities and adjusted for Tukwila's location and unique conditions.
An additional burden to all costs was also added to cover City overheads, design and engineering
and inspection. Costs for peripheral concrete rehab (valley gutters, inlets, approaches, etc.) have
not been included in the analysis.
IMSInfrastructure Management Services Tukwila_Report Page 30
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The unit rates are reflected in the network value, final budgets, and average cost/mile for doing
work in Tukwila.
City of Tukwila, WA
Rehabilitation Strategies and Unit Rates
Rehab Code
Rehab Activity
Rehab Group 1
s
c
critical PCI (Need Year)
All 5 Routine Maintenance 85 100 100
Asphalt 10 Slurry Seal 1 Seal Coat 80 82 85
Asphalt 20 MicroSurtace 1 Chip Seal 70 73 80
Asphalt 23 MicroSurface 1 Chip Seal + Strctrl Ptch 70 73 80
Asphalt 26 MicroSurlace 1 Chip Seal + Strctrl Ptch 60 63 70
Asphalt 39 Edge Mill + Thin Overlay (1.5 - 2.0) 60 63 70
Asphalt 33 Edge Mill + Thin Overlay (1.5 - 2.0) + Strctrl Ptch 60 63 70
Asphalt 36 Edge Mill + Thin Overlay (1.5 - 2.0) + Strctrl Ptch 50 54 60
Asphalt 49 EMIFWM + Moderate Overlay (2.0 - 3.0) 50 54 6D
Asphalt 43 EMIFWM + Moderate Overlay (2.0 - 3.0) + Strctrf Ptch 50 54 60
Asphalt 46 EMIFWM + Moderate Overlay (2.0 - 3.0) + Strctrl Ptch 40 44 50
Asphalt 59 FWM + Thick Overlay (> 2.0 - 3.0) 40 44 50
Asphalt 53 FWM + Thick Overlay (> 2.0 - 3.0) + Strctrl Ptch 40 44 50
Asphalt 56 FWM + Thick Overlay (> 2.0 -3.0) + Strctrl Ptch 25 30 40
Asphalt 69 Surf Recon + Base Rehab 1 FWM + Strctrl Ptch + Olay 25 3D 40
Composite 65 Surf Recon + PCC to Base1FWM + Strctrl Ptch + Clay 25 36 40
Asphalt 70 ACP Full Depth Reconstruction 0 15 25
Composite 75 Full Depth Recon + PCC to Base 0 15 25
Concrete 510 PCC Jnt Rehab & Crk Seal 80 82 1DD
Concrete 520 PCC Localized Rehab 70 73 80
Concrete 523 PCC Localized Rehab + Grind 70 73 80
Concrete 530 PCC Slight Pnl Rplcmnt (<10%) 60 63 70
Concrete 533 PCC Slight Pnl Rplcmnt (<10%) + Grind 60 63 70
Concrete 540 PCC Moderate Pnl Rplcmnt (< 20%) 50 54 60
Concrete 543 PCC Moderate PnI Rplcmnt (< 20%) + Grind 50 54 6D
Concrete 550 PCC Extensive Pnl Rplcmnt (<33%) 40 44 50
Concrete 553 PCC Extensive PnI Rplcmnt (<33%) + Grind 40 44 5D
Concrete 560 PCC Partial Reconstruction 25 36 40
Concrete 570 PCC Full Depth Reconstruction 0 15 25
N
N
ro
9
d tii.
Local Unit Rate (Sryd2)
0.00 0.00 0.00 0.00 0.00
4.50 5.00 4.80 4.70 4.60
6.70 7.25 7.25 7.00 6.75
8.25 8.00 7.75 7.75
9.00 8.75 8.50 8.50
24.50 24.00 23.25 22.75
26.50 25.75 25.25 24.50
28.25 27.75 27.00 25.50
34.50 33.00 32.00 31.00
36.50 35.00 34.00 32.50
38.50 37.00 36.00 34.50
37.50 45.50 43.50 41.50 39.50
48.00 45.50 43.50 41.50
50.00 48.00 46.00 43.50
75.50 72.00 69.00 65.50
80.50 77.00 73.50 70.00
102.50 100.00 97.50 95.50
1 1 1.00 109.00 106.00 104.00
9.75 9.50 925 9.00
21.75 21.00 20.25 19.50
21.75 21.00 20.25 19.50
46.50 44.50 42.50 40.50
46.50 44.50 42.50 49.50
74.00 70.00 66.00 62.00
74.00 70.00 66.00 62.00
108.00 100.50 94.00 87.00
108.00 100.50 94.00 87.00
138.00 131.00 123.00 1 16.00
218.00 204.00 190.00 177.00
22.25
29.75
62.50
66.50
93.00
101.00
8.75
18.75
Figure 15 - Rehab rates by Functional Class
*Unit rates vary slightly between functional classes
Min PCI, Critical PCI, and Max PCI - These define the Pavement Condition Index (PCI) range
applicable to the rehab selection. The Critical PCI defines when a segment is in its need year and is
deemed to be critical, otherwise if deferred, the street declines in PCI past the point which the
rehabilitation is no longer appropriate. Generally the Critical PCI falls 2 to 4 points higher than the
minimum PCI applicable for each rehab activity.
IMS Infrastructure Management Services Tukwila_Report Page 31
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Figure 16 graphically presents the application of pavement rehabilitations for asphalt streets by PCI. The
Rehab numbers are simply placeholders that separate each rehabilitation project identified on the chart
above. For example, Rehab 56 is a Thick Overlay + Structural Patch.
Unit rates increase slightly between functional classes to reflect increase costs in pavement thickness,
traffic control, and striping.
Structural Index (SI) or Strength Rating
100
90
30
70
Zone2
Strong Pavements
Rehab (56)
Thick Overlay
Strctrl Ptch
Zone 3
Zone4 Zones Zone6 'Zone7
Rehab (4S)
Moderate
Overlay +
Strctrl Ptch
Rehab (36)
— Thin Overlay
Strctrl Ptch
Rehab (26)
Micro 1 Chip
Seal + Strctrl
Ptch
Rehab (20)
— Micro l Chip
Seal
Zone8
60 —
50
40
30
Moderate Pavements
Rehab (56)
Thick Overlay
+ Strctrl Ptch
Rehab (50)
Thick Overlay
Rehab (40)
Moderate
Overlay
Rehab (30)
Thin Overlay
Rehab (23)
Micro 1 Chip
Seal + Strctrl
Ptch
Rehab (70)
Full ACP
Recap
Rehab (10
Slurry/Se I
Rehab (5)
Routine
Maintenance
Rehab (60)
Surf ACP
Recon
Rehab (53)
Thick Overlay
+ Strctrl Ptch
Rehab (43)
Moderate
Overlay +
Strctrl Ptch
Rehab (33)
Thin overlay
+ Strctrl Ptch
Rehab (26)
Micro / Chip
Seal + Strctrl
Ptch
Weak Pavements
20 •
10
City of Tukwila, WA
Pavement Condition Index (PCI) Versus Strength
With Applied Rehabilitation Strategies forAsphalt Pavements
M
0 10 20 30 40 50 60 70
Pavement Condition Index (PCI)
Figure 16 — Asphalt (ACP) Rehabilitation Strategies
Selection and Prioritization of Rehab Candidates
80 90 100
The City's pavement management program incorporates a series of user defined values to prioritize and
select the street segments for rehabilitation. The rehab selection order is not worst first, but rather
designed to capture as many segments in their need year based on the incremental cost of rehab
deferral. A Street is considered to be in its need year when it has reached its maximum service life and
any further deferral would require a heavier and more costly rehabilitation. The rehab program has been
designed to maximize the increased service life for each rehabilitation dollar spent on a segment.
Other factors included in the prioritization process focus on:
• Need Year — streets are only selected when they have expended their service life and are optimal
for rehab selection.
IMSInfrastructure Management Services Tukwila_Report Page 32
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• Functional Classification — generally priority is given to higher functional classifications as they
provide greater benefits to a larger group of users
• Pavement Strength — weaker streets are prioritized higher than stronger ones as they
deteriorate faster.
• Area — a very slight increase in priority is given to larger projects over smaller ones.
The net result is a program that favors thick overlays, followed by partial reconstruction projects then full
reconstruction projects (more for safety reasons than cost -benefit). These are then followed by surface
treatments and lastly by moderate to thin overlays.
The programmed deterioration curves illustrated in Figure 17 are designed to integrate the pavement
condition distribution performance curves for the network, with the applied rehabilitation strategies and
their expected life cycle. Different color performance curves are meant to represent the full suite of curves
assigned to segments based upon their functional class, pavement type, and strength.
It is important to recognize that even though all streets fall into specific rating categories and their
respective rehabilitation strategies, it is not until a street falls to within a few points of the lower end of the
range that it will become a critical need selected for rehabilitation.
100
90
80
U 70
o_
60
50
0
U
!= 40
E
30
o_
20
10
0
City
and
of Tukwila,
PCC Performance
WA
Curves
„
ACP
•
ACP Curve-1
ACP Curve-2
144
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‘11111111111111111116..
-ACP Curve-3
ACP Curve-4
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-ACP Curve-5
Curve-6
-ACP
-
-
0
10
20
30
40
Time (Years)
50
Figure 17 - Performance Curves
60
70
IMS Infrastructure Management Services Tukwila_Report
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5.2 FIX ALL AND ANNUAL ESTIMATES
Three different approaches may be taken to identify and confirm the amount of funds the City needs to
set aside each year to maintain the roadway network at its current condition. All three are completed
externally to the pavement management system and are simply used to validate the final results.
Option 1 — Estimated Life Cycle Cost Based on Network Value
An approximate value for the annual street maintenance budget may be quickly determined by taking the
total value of Tukwila's roadway network, estimated at $145M, and dividing that by the ultimate life of a
roadway — approximated to be 50 years. By this method, the annual budget is estimated at $2,900,000.
Please note, the 50 year lifespan of the roadway is the theoretical life of the roadway surface from
construction, until the point at which there not usable surface remaining, it is not simply the lifespan of the
pavement surface until the next overlay.
Rehabilitation Estimate Based on Network Valuation
Pavement Type
Network Ultimate Life Life Cycle Cost
Valuation ($) Span (yrs) ($/Yr)
Asphalt Network 145,009,000 50 2,900,000
City of Tukwila, WA Network Totals:
145,009,000 2,900,000
Option 2 — Estimated Life Cycle Cost Based on Current Condition
A second method to validate the annual budget is to identify the average network PCI and associated
rehabilitation requirements, and then estimate the number of miles required to be rehabilitated each year
based on a typical life cycle for that rehabilitation activity. For Tukwila, the average PCI for asphalt roads
is 66, which places the Tukwila asphalt network in the Edge Mill + Thin Overlay, at an average cost of
$23.55/yd2. Based on this estimate the City needs to spend approximately $2,107,337/year to maintain
the current condition average.
Rehabilitation Estimate Based on Network Average Condition
Pavement Average Blended Average
Condition Rehab Rehab Life Miles to do Unit Rate Cost per Life Cycle
Pavement Type Index (PCI) Code Rehab Activity Cycle (Yrs) Each Year ($lyd2) Mile ($!) Cost ($!Yr)
Asphalt Network 66 30 Edge Mill + Thin Overlay (1.5 - 2.0) 18 4.5 23.55 471,300 2,107,337
City of Tukwila, WA Network Totals: 2,107,337
IMS Infrastructure Management Services Tukwila_Report Page 34
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Option 3 - Estimated Life Cycle Cost Based on Network Deficiency
The third methodology to confirm the required amount of annual funding is to identify the current network
deficiency, that is the amount required to rehabilitate all streets in the network assuming unlimited
funding, and then divide by the typical life cycle of each rehabilitation activity. This is referred to as the
Fix All Estimate and Life Cycle Cost. The rehab strategies listed in the table are generic in nature and not
necessarily the final set that was applied to Tukwila. For Tukwila, the Fix All Estimate for the network
deficiency is approximately $34M and the Life Cycle Cost is $1.97M/year, broken down as follows:
City of Tukwila, WA
Rehabilitation Estimate Based on Current Network Deficiency and Life Cycle Cost
Rehab Activity
Life
Network % of Principal Minor Cycle Life Cycle
Total ($) Total Arterial Arterial Collector Local (Yrs) Cost ($/Yr)
10 Slurry Seal/ Seal Coat 761,000 2.2 175,700 427,280 0 157,980 5 152,200
23 MicroSurface/Chip Seal + Strctrl Ptch 2,895,100 8.5 386,910 540,340 373,820 1,594,040 8 361,900
26 MicroSurface / Chip Seal+ Strctrl Ptch 518,300 1.5 518,260 0 0 0 8 64,800
30 Edge Mil1+ Thin Overlay (1.5 - 2.0) 7,453,000 21,8 674,460 1,989,830 1,796,670 2,992,060 ▪ 18 414,100
33 Edge Mill+ Thin Overlay (1.5 - 2.0) + Strctrl Ptch 3,055,400 9.0 2,407,990 340,720 186,010 120,660 18 169,700
36 Edge Mill+ Thin Overlay (1.5 - 2.0) + Strctrl Ptch 83,900 0.2 0 0 0 83,930 18 4,700
40 EM/FWM+ Moderate Overlay (2.0 - 3.0) 11,757,800 34,5 2,388,090 2,004,540 3,313,380 4,051,790 ▪ 23 511,200
43 EM/FWM + Moderate Overlay (2.0 - 3.0) + Strctrl Ptch 2,279,400 6.7 1,699,250 580,140 0 0 23 99,100
50 FWM + Thick Overlay (> 2.0 - 3.0) 3,970,600 11.6 797,930 612,080 0 2,560,560 28 141,800
53 FWM+Thick Overlay (>2.0-3.0)+Strctrl Ptch 1,105,400 3.2 1,105,440 0 0 0 28 39,500
56 FWM + Thick Overlay (> 2.0 - 3.0) + Strctrl Ptch 234,800 0.7 0 0 0 234,770 28 8,400
Total Asphalt and Composite Network:
34,114,700 100.0 10,154,030 6,494,930 5,669,880 11,795,790 1,967,400
IMSInfrastructure Management Services Tukwila_Report Page 35
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5.3 NETWORK BUDGET ANALYSIS MODELS
An analysis containing a total of 10 profile budget runs plus a Do Nothing options was prepared for
Tukwila.
The analysis results are summarized below:
• Do Nothing (illustrated in Figure 20) — This option identifies the effect of spending no capital for 5
years. After 5 years, this scenario results in a network average PCI drop from a 66 to a 54 and a
dramatic increase in backlog to 17%
• Client Budget (Green Line) — this represents the City's current annual budget of $1.05M annually
dedicated to pavement preservation and rehabilitation. This level of funding will result in a
network average PCI score of 59 and a backlog increase to 12%.
• Steady State PCI — this is simply the funds required to maintain the current network average PCI
at a 66. The annual budget required to do so is on the order of $2.42M annually, however
backlog (Very Poor & Poor roadways) continues to climb to 6%.
• Backlog Control Budget — A budget designed to maintain the City's current backlog at 5%.
The results of the analysis are summarized in Figure 18 below. The X-axis highlights the annual budget,
while the Y-axis plots the 5 Year Post Rehab Network Average PCI value. The diagonal blue line is the
results of the pavement analysis (the Tukwila model profile).
90
85
80
O
=a
}75
Y 70
`o
_a
65
01
O
a
60
55
City of Tukwila, WA
Five Year Post Rehab PCI Versus Annual Budget
Analysis Start Date = 1/1/2021 Analysis Period 2021 to 2025
r
Maintain Current Backlog: Final PCI= 83, Backlog = 1%, Annual Budget =$6430k/Yr
Recommended Budget: Final PCI = 75, Backlog = 3%, Annual Budget = $4425k/Yr
Backlog Control Budget: PCI = 67, Backlog = 5%, Annual Budget = $2803k/Yr
Steady State PCI: Final PCI = 66, Backlog = 6%, Annual Budget = $ 2420k/Yr
PCI Control Budget: PCI = 60,Backlog= 11%, Annual Budget = $1220k/Yr
Tukwila Budget: PCI= 59, Backlog = 12%, Annual Budget = $1050k/Yr
Current PCI = 65.6 (2020)
50
0
1,000 2,000
Control PCI = 60
1 I Tukwila has a Backlog controlled network
1 I
I 1
I !
I I
I 1
I 1
I 1 !
I I
I I
I 1
I I
I 1
I I
1 1
I 1
1 1 I
1 1 I
1 1 I
1 1 I
1 1 I
3,000 4,000 5,000 6,000 7,000
Annual Budget Each Year for Five Years ($1,000/Yr)
Figure 18 — 5 Year Post Rehab Network PCI Analysis Results
IMSInfrastructure Management Services Tukwila_Report Page 36
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Figure 19 presents the resultant network backlog against annual budget. Similar to Figure 18, but
instead of plotting the average PCI score, the blue diagonal line represents the total backlog after 5 years.
The lower the backlog the better, with a maximum of 12% recommended
Post Rehab Network Percentage Backlog% (PCI <40)
20
15
10
5
City of Tukwila, WA
Five Year Post Rehab Backlog (°%) Versus Annual Budget
Arelysis Date = 7/16/2020 Arelysis Period 2021 to 2025
—Tut:wla Budget: PCI = 59, Backlog = 12%, Annual Budget = $1050kfYr
—PCI Control Budget: PCI = 60, Backlog = 11 %, Annual Budget = $1220k[Yr
Steady State PCI: Final PCI = 66, Backlog = 6%, Annual Budget = $2420k[Yr
— — Backlog Cortrol Budget: PCI = 67, Backlog = 5%, Annual Budget = $2800k[Yr
— — Recommended Budget: Final PCI = 75, Backlog = 3%, Annual Budget = $4425kfYr
— — Maintain Current Backlog: Final PCI = 83, Backlog = 1%, Annual Budget = $6430kfYr
Current Bac klog =1,3% (2020j
1,000
2,000
3,000
4,000
Cortrol Backlog =S%
Tukwila has a Bac klog co nt rolled retmork
�kfaBAnafy�s�e5ylts
5,000
Annual Budget Each Year for Five Years ($1,000fYr)
Figure 19 — 5 Year Post Rehab Network Backlog Results
6,000 7,000
IMSInfrastructure Management Services Tukwila_Report Page 37
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Figure 20 presents the analysis results on an annual basis. This shows that if the budget falls below
$2.42M/year (Steady State Budget), over time the overall condition of the roads will deteriorate as
backlog continues to grow.
Network Average Pavement Condition Index
100
95
City of Tukwila, WA
Annual Condition for Various Budget Levels
-
Analysis Date = 7/16/2020
90 -
Fix All Budget = $36.1M Over 5 Years
i
Steady State PCI: Final PCI = 66, Backlog = 6%, Annual Budget =
Tukwila Budget: PCI= 59, Backlog 12°%, Annual Budget
i
= =
Do Nothing
_
ar
Tukwila has a Backlog controlled network
DU
Start 2021 2022 2023 2024
Year
2025
Figure 20— 5 Year Annual PCI
IMSInfrastructure Management Services Tukwila_Report Page 38
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5.4 POST REHABILITATION CONDITION
The following figure (Figure 21) compares the current network condition distribution (red) against what
the 5-year post rehabilitation distribution would be at with a budget of $1.05M/year (blue) As can be seen
in the plot, the Tukwila budget will reduce the overall network's PCI average and increase the amount of
roads rated as Marginal and Poor.
40
35
30
m
25
m
0
20
N
z
0
l4 15
0)
u
0
City of Tukwila, WA
Post Rehab Pavement Condition Comparison
Current Condition Versus Selected Budget
Analysis Period 2021 to 2025
Current Network Average Condition =65.6, Backlog=1.3%
Post Rehab Network Average Condition=59.1, Backlog= 11.5%
Annual Budget=$1050 k/Y ar
V Poor (0 to 25)
Poor (25 to 40) Marginal (40 to 50) Fair(50 to 60) Good (60 to 70) V Good (70 to 85) Excellent (85 to 100)
Pavement Condition Using Descritive Terms
Analysis Late= 1/1/2021
Figure 21 — Five -Year Post Rehabilitation Condition Distribution
Three metrics are used to evaluate the quality of a roadway network, they are:
Average Condition — should be between 60 and 65 at a minimum
Percentage of Backlog — target 12%, should be less than 15%, must be less than 20%
Percentage of Streets Rated as Excellent — should be greater than 15%
/MS Infrastructure Management Services Tukwila_Report
Page 39
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Figures 22 and 23 present the current Tukwila recommended budget network rehabilitation plan by year
and activity. Electronic versions of these maps are appended to this report.
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Pave n nt Anah•sis
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} 051.},00.1 AnnuUI rI. d !'
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Figure 22 — $1.05M/Year Rehabilitation Plan by Activity and Year
IMS Infrastructure Management Services Tukwila_Report
Page 40
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Pavement Analyst
5 - Bor P4$f R Gfti PCI'
.I ,0,50104 Afuwal Budget
ksy Snxnou!
1,30L. L.A.
•
F.
Figure 23 — $1.05M/Year Post Rehabilitation PCI by Segment
IMS Infrastructure Management Services Tukwila_Report
Page 41
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5.5 TRUE COST OF UNDERFUNDING OF A ROADWAY NETWORK
Funding of roadway rehabilitation is an exercise in identifying the balance between available funding and
the desired level of service that is right for each agency. There are no hard rules for what is the definitive
level of funding as this is a decision for local elected officials, based on their priorities and practices.
However, the true costs of over and underfunding must be presented in order to provide decision makers
with all the information available to base the decisions upon. Tukwila has a considerable investment in
their paved roadway network with a combined replacement value (just for the streets, not right of way)
exceeding $36M. Spreading this cost over a 50 year period (the expected ultimate life of a roadway)
means that an annual investment on the order of $2.42M per year would be required — not including the
cost of maintenance, deterioration ,repair curbing, drainage, tree roots, sidewalks or ADA ramps.
Government Accounting Standards Board Statement 34 requires that agencies who collect taxes (local,
business, property or gas taxes) for the purpose of maintaining long term infrastructure assets (such as
roads) be good stewards of those assets by either accounting for them financially on the City's balance
sheet, or implement a methodology to manage and fund them to a locally defined level of service.
The condition of a roadway network may be equated to equity in a depreciating asset. Regular payments
to that asset must be made in order to maintain the equity at a constant level. Should those payments fall
short, the equity must eventually be replaced through a large influx of capital in order to make the
investment whole again. Roadway networks are no different. Long term underfunding of rehabilitation
and maintenance is the direct equivalent of removing equity from an asset — eventually it must be repaid
through total reconstruction. The following table compares the real cost of the various budgets against
the Do Nothing and Steady State options.
City of Tukwila, WA
Equity Removal Summary
Starting PCI: 66
Five Year Post Rehab Fix All PCI: 86
Fix All PCI Increase: 20
Five Year Fix All Total Cost ($): r 36,142,000
Cost Per PCI Point (Total Cost ! PCI Increase, $ipt) 1,770,000
Equity Removal Based On PCI Restoration For PCI Controlled Agencies
Model: Do Nothing $750k Annual $1500k Annual $2250k Annual Steady State
Annual Budget ($kfYear): 0 750 1500 2250 2420
Starting PCI 66 66 66 66 66
Final PCI 55 58 61 65 66
PCI Drop: 11 8 4 1 0
Cost to Replace Equity (PCI Drop X $11,1, $): 18,894,000 13,476,000 7,881 ,000 1,489,000 0
6 Year Budget Expenditure ($): 0 3,750,000 7,500,000 11 ,250,000 12,100,000
Total 5 Year Cost ($): 18,894,000 17,226,000 15,381 ,000 12,739,000 12,100,000
Cost Over Steady State Budget ($): 6,794,000 5,126,000 3,281 ,000 639,000 0
Additional Annual Cost Over Steady State ($year): 1,368,800 1,026,200 656,200 127,800 0
IMS Infrastructure Management Services Tukwila_Report Page 42
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5.6 NETWORK RECOMMENDATIONS AND COMMENTS
The following recommendations are presented to Tukwila as an output from the pavement analysis, and
must be read in conjunction with the attached reports.
1. Tukwila should adopt a policy statement to maintain PCI at or above a 60 while keeping backlog
below 15%.
An annual budget of $1.05M (dedicated to pavement rehabilitation) will achieve a network
average PCI of 59 and backlog of 12%.
An annual budget of $2.42M (dedicated to pavement rehabilitation) will achieve a network
average PCI of 66 and backlog of 6%.
2. The full suite of proposed rehabilitation strategies and unit rates should be reviewed annually as
these can have considerable effects on the final program.
3. No allowance has been made for network growth. As the City expands or increases the amount of
paved roads, increased budgets will be required.
4. No allowance has been made for routine maintenance activities such as asphalt crack sealing,
pothole filling, sweeping, striping or patching within the budget runs and analysis. These costs are
assumed to be outside the pavement management costs.
5. The City should resurvey their streets every few years to update the condition data and
rehabilitation program.
IMS Infrastructure Management Services Tukwila_Report Page 43
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56
Appendix A
Street Inventory and Condition Summary
57
58
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
65
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
66
Condition Summary
(lada) lad luaw6aS luaaan3
(ayiN) slonpaa ssaals!a peo1-uoN
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
67
Condition Summary
(lada) lad luaw60S luaaan3
(ay1N) slonpaa ssaals!a peo1-uoN
(aavi) slonpea ssaals!a OOSSy peol
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
70
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
72
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
74
Condition Summary
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TukwilaWA2020_ESA_ Rev2, Inventory, 8/21/2020
re Management Se
76
Appendix B
$1.05M/Year Rehabilitation Plans by Segment
77
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Current PCI Date:
City of Tukwila, WA
Analysis Start Date:
$1050k/Year Rehabilitation Plan
Street Inventory and Five Year Rehabilitation Plan By Segment
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TukwilaWA2020_ESA_ Rev2, Rehab By Segment, 8/21/2020
re Management Se
79
Current PCI Date:
City of Tukwila, WA
Analysis Start Date:
$1050k/Year Rehabilitation Plan
Street Inventory and Five Year Rehabilitation Plan By Segment
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TO:
FROM:
BY:
CC:
DATE:
SUBJECT:
ISSUE
Introduce the
City of Tukwila
Thomas McLeod, Mayor
INFORMATIONAL MEMORANDUM
City Council
Hari Ponnekanti, Public Works Director
Cyndy Knighton, Senior Program Manager — Transportation
Thomas McLeod, Mayor
April 12, 2024
Update on the Neighborhood Traffic Calming Program
Neighborhood Traffic Calming Program and update Council on the current status.
BACKGROUND
In 2005, staff developed a Traffic Calming program that was presented to the Transportation
Committee for approval. Using that early program, two pilot projects were done to test out the
interest of the residents and that eventually generated high interest from the residents and
elected officials. Late 2018, the Council approved Resolution 1955, adopting the current
Neighborhood Traffic Calming Program (NTCP).
The NTCP was developed to be an equitable, repeatable program that would be prioritized
based on data and available funding. While not explicitly included, past Councils have
encouraged geographic equity as well as demographic. Additionally, the program was designed
to ease implementation, with minimum hurdles, for the lowest level of treatment types. The
program includes two levels of treatment approaches. Level I improvements are passive traffic
control treatments that can be implemented quickly and inexpensively and are often all that is
needed to address neighborhood complaints. Level II treatments are physical devices, often
permanently installed, which require more extensive design efforts and are costlier. Additionally,
Level II treatments require coordination with emergency services and approval from the Council.
Emergency services are included as Level II devices as they can negatively impact response
times.
Requests for treatment consideration can come to staff using just about any avenue. The City's
website has an NTCP page with a form to fill out. Emails directly to staff can be added into the
overall list of requests. It's common that elected officials hear directly from residents and pass
along their concerns, which are then added. There are around 100 requests on the NTCP list at
this time.
DISCUSSION
Funding for the program was first provided in the 2019 budget year in the Capital Improvement
Plan under Traffic Calming/Residential Safety Improvements, Project No. 80010301. During
2019 and into the first quarter of 2020, multiple requests had calming and safety treatments
installed. The budget was eliminated after the first quarter of 2020 due to cutbacks associated
with the Covid-19 pandemic. Late 2021, American Recovery Plan Act (ARPA) funds were used
to restore funding for the NTCP and staff presented a list of Top-10 Recommended NTCP
projects that would be the primary focus for the program. In 2022, the Project Manager position
that managed the NTCP was vacated due to retirement and the position was filled with a new
person. Unfortunately, the new employee chose to return to his previous employer after just 5
months, and the position has been vacant ever since. The City is currently trying to fill this
position at this time. Other staff have continued to work on the NTCP as available.
https://tukwilawa.sharepoint.com/sites/mayorsoffice/cc/council agenda items/public works/ntcp intro & update/a. info memo - ntcp introduction & update 4-15-
24.docx
91
INFORMATIONAL MEMO
Page 2
The Top-10 list does not follow the steps outlined in the NTCP but was rather developed as a
plan to address needs given the challenging economic conditions and have a plan that was
approved for ARPA fund expenditure. In December 2023, staff provided an update on the NTCP
to the Transportation and Infrastructure Services Committee. All of the projects identified in the
Top-10 list have either been completed or are underway at this time.
FINANCIAL IMPACT
Continued funding after the ARPA funding expires at the end of 2024 will be needed to continue
this program. Funding a staff position to manage the NTCP is also necessary to return to levels
provided prior to the 2020 pandemic.
RECOMMENDATION
Information Only.
ATTACHMENTS
• Resolution 1955: Neighborhood Traffic Calming Program
• 2019 — Q1 2020 NTCP Accomplishments
• December 2023 TISC NTCP Update
https://tukwilawa.sharepoint.com/sites/mayorsoffice/cc/Council Agenda Items/Public Works/NTCP Intro & Update/a. INFO MEMO - NTCP Introduction & Update
4-15-24.docx
92
City of Tukwila
Washington
Resolution No. G�
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF
TUKWILA, WASHINGTON, ADOPTING THE "CITY OF TUKWILA
NEIGHBORHOOD TRAFFIC CALMING PROGRAM."
WHEREAS, one of the top concerns of Tukwila community members is speeding and other
dangers associated with motor vehicles; and
WHEREAS, the City of Tukwila desires to reduce the negative effects of motor vehicle use,
alter driver behavior, and improve conditions for non -motorized street users; and
WHEREAS, the adopted Tukwila Comprehensive Plan recommends implementation of a
neighborhood traffic calming program in both the Transportation Element and the Residential
Neighborhoods Element; and
WHEREAS, the City Council desires to document a transparent, predictable and equitable
process for implementing effective traffic calming measures in neighborhoods throughout the City;
NOW, THEREFORE, THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON,
HEREBY RESOLVES AS FOLLOWS:
The "City of Tukwila Neighborhood Traffic Calming Program," as evidenced in Exhibit A, is
adopted.
PASSED BY THE CITY COUNCIL OF THE CITY OF TUKWILA, WASHINGTON, at a
Special Meeting thereof this f (1tJ day of e) C 0 n, h4 /' , 2018.
ATTEST/AUTHENTICATED:
Christy O'F1at erty, MMC, City
APPROVED AS TO FORM BY:
L-4q,„j v--)"
Rachel B. Turpin, City'Attorney
Verna ell Coun it President
Filed with the City Clerk: ID— 5
Passed by the City Council: ) jT , r
Resolution Number: j G UCS
Attachment: Exhibit A — City of Tukwila Neighborhood Traffic Calming Program
W:\Word Processing\Neighborhood Traffic Calming Program 11-30-18
LH:bjs
Page 1 of 1
93
94
CITY OF TUKWILA
PUBLIC WORKS DEPARTMENT
NEIGHBORHOOD TRAFFIC
CALMING PROGRAM
Adopted December 10, 2018
By Resolution No. 1955
95
Table of Contents
OBJECTIVES 1
PROCESS STEPS 1
INITIATING A REQUEST 1
PRELIMINARY EVALUATION 2
SOLUTION ALTERNATIVES 2
No Action 3
Level I 3
Level II 3
PROCESS FOR QUALIFYING FOR LEVEL II TREATMENTS 3
PLAN DEVELOPMENT 4
PROJECT FUNDING 4
PROJECT DESIGN AND CONSTRUCTION 5
EVALUATION 5
RE -ENROLLMENT 5
APPENDICES
APPENDIX A: DEFINITIONS OF TYPES OF STREETS
APPENDIX B: PRIORITY RANKING WORKSHEET
i
96
Introduction
Traffic conditions on residential streets greatly affect neighborhood livability. Speeding and
unnecessary through -traffic in neighborhoods create safety hazards on residential streets. The City
of Tukwila Public Works Department has developed a Neighborhood Traffic Calming Program
(NTCP) to guide City staff and inform residents about the procedures for implementing traffic
calming on residential streets and collector streets.
The NTCP is designed for local residential streets and collector arterials only. The NTCP does
not apply to local or arterial streets in commercial areas or to streets classified as principal or minor
arterials.
As defined by the Institute of Transportation Engineers (ITE), traffic calming is the application of
measures which can be taken which reduces the negative effects of motor vehicle use, alters driver
behavior and improves conditions for non -motorized street users. The City's NTCP outlines a
process for staff and residents to carry out a traffic calming program. It provides a way to
objectively prioritize traffic calming requests. These procedures incorporate prioritization,
planning, evaluation, implementation, and maintenance of the traffic -calming devices in
residential areas. It also combines the four E's — Education, Engineering, Enforcement and
Emergency Services.
Obiectives
The primary goal of the City's NTCP is to improve the livability of the local streets and residential
collectors. The City has identified the following objectives:
• Provide alternative solutions to reduce vehicular speeds and accidents on residential streets.
• Endorse safe and pleasant conditions for motorists, bicyclists, pedestrians, and residents of
neighborhood streets.
• Provide a means for a collaborative working relationship between City staff and
neighborhood residents in development of traffic calming measures.
• Discourage use of residential streets for cut -through vehicular traffic.
Process Steps
Initiating a Request
Request for traffic calming assistance can come from a resident's association or from concerned
individuals. Requests can be made in writing by clearly stating the problem and location,
accompanied with completed application which is provided by the City. The request can be made
by either mailing or emailing the request to the Public Works Department. The request must
include a contact name, address, phone number and email.
1
97
Staff will then acknowledge the completed application in writing to the resident's association or
to the contact person listed in the application. An application fee could be implemented in the
future to offset some of the costs involved.
Preliminary Evaluation
Each street in the community is a part of the larger roadway network that connects residents to
each other, work, schools, goods, services and the countless destinations to which drivers and
pedestrians travel daily. Common issues within neighborhoods include speeding, traffic volumes,
and the utilization of neighborhood streets as a cut -through route, among others. In order to ensure
that traffic calming concerns are addressed in an equitable manner, staff must assess the situation
by reviewing the request and determining if the area qualifies for treatment using set criteria. The
primary purpose of a preliminary evaluation is to determine whether the speeding or accident
situation is significant enough to warrant further study. At this stage, staff collects data to analyze
it to determine whether:
• The roadway is eligible for traffic calming treatment.
o Only residential streets classified as collector arterial or local access are eligible.
• City recorded data supports the problem identified in the application.
o Speeding: Traffic counts are taken to determine if 15% of the motorists travel at 5
mph or more above the posted speed limit This is also referred to as the 85th
percentile speed being at or above 5 mph over the speed limit.
o Volume: Traffic counts also collect the number of daily vehicles on a street. This
information is used to determine the best type of solution and is used to rank project
priorities.
o Traffic Accidents: The number of accidents for over a three-year period is collected
and studied.
The Public Works Director has the discretion to move an application forward or to address any
safety issues discovered outside of the NTCP process.
If the analysis confirms that a traffic problem exists based upon the above criteria, the Public
Works Department will conduct a traffic calming study as explained in the following sections and
staff calculates the priority score for the street segment using the Priority Worksheet in Appendix
C.
A written response back to the contact person with the findings of the preliminary evaluation is
generally provided within 60 calendar days of the request.
Solution Alternatives
The solution alternatives are defined into three levels.
2
98
No Action
After data collection and analysis is complete, any location not meeting the above criteria will be
determined to not be eligible for any NTCP assistance. Staff will inform the applicant in writing
that their request does not meet the City criteria for action and the request will be closed.
Level I
The first level improvement for traffic calming that should be considered are passive traffic control
treatments, known as Level I. Level I improvements are less restrictive measures, and do not
require a vote of the affected residents. The improvements used in Level I include: trimming
bushes to allow better sight distance; pavement markings and striping; increased police
enforcement; traffic speed display signs; neighborhood awareness campaigns; and education. This
reduces the need for installing physical devices on every local street.
If a marked crosswalk is recommended for installation where ADA-compliant ramps do not
currently exist, the improvement will be automatically treated as a Level II solution.
Level II
Level II improvements should be considered only after Level I treatments have been in place for
a minimum of 6 months and data collection and analysis indicate the problem(s) has not been
resolved, or as determined by the Public Works Director. Level II improvements focus on physical
devices such as speed cushions, traffic circles, and chicanes to calm traffic. These solution
alternatives are much costlier than Level I and are generally permanent. Therefore, a more detailed
evaluation is required and approval by key depai liiients and impacted area residents is required
before the implementation. The detailed evaluation includes as follows:
• The speed, volume and accident history collected during the preliminary evaluation.
• Collect new traffic speed and volume data and accident history for the past three
consecutive years.
• Other factors such as proximity to schools, parks and other pedestrian generators, lack of
sidewalks, accessibility, presence of bicycle facilities, and other roadway characteristics.
• Identify users of the affected streets.
• Identify traffic and major pedestrian generators, such as schools, parks and shopping
centers.
• Analyze street use with respect to street classification.
• Document any other relative factors.
Process for Qualifying for Level II Treatments
If the traffic problem(s) has not resolved with Level I treatments, an impact area is established by
staff after identifying users of the affected street(s), identifying major traffic generators such as
schools and parks, analyzing the actual street use with respect to roadway classification, and any
other relative factors. The impact area includes the location requesting treatment as well as other
streets in the immediate area that could be impacted by Level II treatment installation.
3
99
Plan Development
Once an area has been selected for a traffic -calming project, steps need to be taken to determine
solutions. The applications are prioritized based on the scores. The highest-ranking applications
will be given priority in moving forward into Plan Development, as funding allows.
Since Level I solutions are simpler in scope, the solution formulation process can usually be
handled by staff. Public meetings are not usually required, although some type of public
communication is beneficial and recommended.
Level II improvements require a more comprehensive plan development due to the higher cost and
impact of the actions taken. A public meeting with all affected residents may be held, as
determined by the Public Works Director. The initial public meeting will:
• Discuss the steps to develop a traffic -calming plan.
• Gather additional information regarding traffic problems and related neighborhood needs.
A ballot may be provided to each resident, either in person or via the postal service, to vote to
indicate support of the NTCP plan. The implementation plan must receive at least 2/3 approval of
all residents on the impacted street in order to proceed. In addition to the community support, the
approval of the following public officials is required:
• City Police and Fire Departments
• City Council
Once the necessary level of support is documented, projects may be funded and constructed
according to their prioritization and as available staffing and budget permits.
In cases where a Level II request does not receive sufficient support, the project is dropped from
the list and the next highest ranked project can go through the same process. Residents in an area
where a project has been dropped are able to resubmit their request for the following program year.
Project Funding
The number of traffic -calming projects undertaken each year depends on the City's budget and
staffing availability. The City Council's Transportation & Infrastructure (or successor) Committee
will be kept apprised on projects both proposed and selected on a regular basis, and the City
Council will be notified of the NTCP's progress and expenditures at least every six months.
In some cases, landscaping, maintenance and necessary easement dedication may be the
responsibility of the residents or the homeowner's association. If this is the case, an agreement
must be signed between the City and residents before the project is implemented.
4
100
Project Design and Construction
Once traffic -calming treatments have been determined, the City's staff or a consultant develops
the detailed plan, based on the study and the residents' input. The traffic calming device will be
installed.
In some situations, a test installation may be warranted to assure that the device is both effective
and truly desired by the community. In this case, within three to twelve months after installation,
staff evaluates how well the test installation performed in terms of the defined problems.
Evaluation
An evaluation shall be conducted between six months to one year after the implementation of any
permanent traffic calming devices. Speed, volume and collision data is collected and compared
with the data collected before the installation of the traffic -calming device. The data collection
should be done at approximately the same time of year as the original data collection.
Re -enrollment
If additional traffic calming treatments become necessary in the future due to changes in traffic
patterns unrelated to the NTCP treatments, requests can be made for a new enrollment 12 months
or more after the last evaluation period has been completed. The submission will be treated as a
new request beginning with preliminary evaluation and will follow the NTCP process. Any future
traffic calming treatments will be scored and ranked along with all other active requests and are
subject to funding and staffing availability.
5
101
Appendices
102
Appendix A: Definitions of types of streets
The City's Transportation Element of the Comprehensive Plan defines the street functional
classifications. For the sake of this program, only residential local streets and collector arterials
are eligible for NTCP treatments. Streets in commercial areas or which are classified as principal
or minor arterials are not eligible for treatments under this program. Traffic calming on principal
and minor arterials is very different than on residential streets, requiring substantial design,
permitting, environmental approval, and budget in order to construct. These calming projects are
developed into standalone capital improvement projects.
Local streets (typical speed limit 25 mph) serve local circulation needs for motor vehicles,
bicycles, and pedestrian traffic and provide access to residences and some businesses. Local
streets are not intended to carry significant volumes of through traffic. Sixty to 80 percent of
the roadway network is considered local streets.
Collector arterials (typical speed limit 30-35 mph) are typically streets that provide access
between local service streets or from local streets to thorough -fares. Collectors often carry
some through traffic. Collectors in residential areas are eligible for NTCP treatments whereas
collectors in commercial areas are not. Five to 10 percent of the roadway network is classified
as collector arterials.
Minor arterials (typical speed limit 30-40 mph) are streets which are typically wider and
may have more lanes than collectors which connect the smaller arterial streets to destinations
or to the regional roadway network. Minor arterials carry a large percentage of through traffic
as well as traffic from the local area. Ten to 20 percent of the streets in network are minor
arterials.
Principal arterials (typical speed limit 35-50 mph) are major streets and highways that
provide regional connections between major destinations. Speeds are higher, access and
traffic control favors providing fast and smooth movement on the arterial over the lower
classified streets. Five to 10 percent of a roadway network is classified as principal arterials.
103
LEGEND
Roadway Classification
Freeway
Principal
Minor
• Collector
[Ill City of Tukwila
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ROADWAY CLASSIFICATION
Appendix B: Priority Ranking Worksheet
Location:
Date:
Staff Name:
Cate ' or
Accidents:
Five points for each recorded accident over the past three years. Three
additional points will be added for each accident with a recorded injury.
Data
Score
Volume:
Average weekday traffic volume divided by 100, rounded up to the
nearest whole number. Maximum of 7 points possible.
Speed:
Five points for every mph greater than 5mph above the posted speed or
(85th percentile speed - posted speed limit - 5) x 5 points.
Sidewalks:
Five points if there is not a continuous sidewalk on one side of
residential streets or both sides of collectors.
Pedestrian Generators:
Five points for every K-12 school on and 2 points for school property
within 500 ft of the subject street. Three points for other major
pedestrian generator on the subject street. Major pedestrian generators
may include parks, community centers, senior housing, or other uses
with significant pedestrian traffic.
Total Points:
105
106
Location Safety issue(s) Requester Cost Status Level Complete?
Rapid Rectangular Flashing Beacons
5/19/2019
5/1/2018
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3 signs installed
4 signs installed
1 sign eastbound
2 signed installed for east and west
2 signed installed for east and west
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1 sign installed for WB
2 signed installed for east and west
2 Radar signs installed
2 Radar signs installed
2 Radar signs installed
2 Radar signs installed
2 Radar signs installed.
4 speed cushions installed
1 speed cushion installed, 1 under consideration
$23,591 Completed- new flashers, marked crossing, curbing
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Speeding
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TIB at S.141st St
S.144th St at 46th Ave S
S.144th St at 37th Ave S
65th Ave S at Southcenter Blvd
62nd Ave S at Southcenter Blvd
S.150th St at Thorndyke Elementary
58th Ave S at S.144th St
37th Ave S at S.137th St
37th Ave S at S.140th St
53rd Ave S at S.170th St
S.133rd St at 32nd Ave S
S.135th St at 32nd Ave S
I S.147th at 57th Ave S
Military Rd at S.133rd
I S.170th at 53rd
S.144th at 56th Ave S
Macadam Rd S at 13700 blk
S.164th St at 4700 blk
42nd Ave Sat 11900 blk
S.140th St at 3500 blk
S.130th St at 37th Ave S
153rd Ave S at S 140th
S.148th St at 4400 blk *
S.148th St (Impact Charter Schools)
53rd/52nd Trafffic circulation revision
65th, Scblvd and 62nd
42nd Av S at S.140th
44th Ave S at 11800 blk
107
Location Safety issue(s) Requester Cost Status Level Complete?
NTCP Design Contract
3/31/2020
3/31/2020
3/31/2020
3/31/2020
3/31/2020
LED Enhanced Stop Signs
3/31/2020
3/31/2020
3/31/2020
3/31/2020
3/31/2020
Crosswalk Safety Flags installed
3/31/2020
3/31/2020
3/31/2020
3/31/2020
3/31/2020
3/31/2020
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3/31/2020
3/31/2020
Miscellaneous Expenditures by Shops
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1 sign installed for EB
1 sign installed for WB
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S.150th St at 46th Raised Crosswalk
New ADA ramp at Impact charter Sch
53rd/52nd/137th traffic revision
New Stop sign 44th/S.140th
54th Ave S Additional Gaurdrail
51st at S.160th NB
S.160th at 51 st EB
S.160th at 42nd WB
S.170th at 53rd EB
40th Ave S at EMW NB
61st at Tukwila Parkway
4634 Southcenter Blvd
144th Crosswalks at SHAG
144th at 37th RRFB
S.148th school crossing
S.150th/42nd Signal
S.146th at 46th RRFB
Interurban at S.149th RRFB
Gateway Drive at BECU
108
City of Tukwila
Allan Ekberg, Mayor
Public Works Department - Hari Ponnekanti, Director/City Engineer
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Services Committee
FROM: Hari Ponnekanti, Public Works Director/City Engineer
BY: Cyndy Knighton, Senior Program Manager
CC: Mayor Ekberg
DATE: December 1, 2023
SUBJECT: Neighborhood Traffic Calming Program
Project No. 82310301
Year End Report
ISSUE
Update the Council on the achievements of the Neighborhood Traffic Calming Program for 2023.
BACKGROUND
Ever since 2021, when ARPA funding was made available to the City, and specifically the
Neighborhood Traffic Calming Program, staff, and our consultant, KPG-Psomas, has been mostly
focusing on the Top-10 Recommended NTCP Projects list developed in late 2021. The 2021
priority was to purchase normal stock items used in traffic calming, such as LED street signs,
speed feedback signs, and Rectangular Rapid Flashing Beacon (RRFB) units. In 2022, staff and
KPG focused efforts in Allentown, the TCC, three elementary schools, S Ryan Way, and the S
144th S/46th Avenue S intersection.
DISCUSSION
Building on the work completed in 2022, staff and KPG have continued building on the work
completed in 2022 and have begun additional work on the rest of the Top-10 list. Staffing changes
have reduced the amount of time available to work on the NTCP, but work has continued
addressing every project on the Top-10 list. Some study will carry into 2024 to complete the
planning and engineering; however, the construction of the new raised crosswalk and RRFB on
42nd Ave S at the S 119th Street Pedestrian Bridge is expected to be fully complete and operational
this year. When all the study efforts are complete, staff will discuss the findings with the Council
and will prioritize which projects move into construction in 2024 and beyond. Grants are not readily
available for traffic calming projects, except for the Transportation Improvement Board's Complete
Street program. A new call for projects under that program is expected in late spring, and staff
will apply for funding.
FINANCIAL IMPACT
N/A
RECOMMENDATION
Information only.
ATTACHMENTS
• Staff Top-10 Recommended NTCP Projects
• Top-10 Locations Map
109
Status Update for the Neighborhood Traffic Calming Program — December 2023
A. Allentown Neighborhood
• Completed study.
• Submitted two grant applications to fund safety, traffic calming, and pedestrian improvements.
• Completed memo for the closure of the 42nd Avenue S bridge over the Duwamish River.
• Constructed raised crosswalk with RRFB on 42nd Avenue S at 119th Street pedestrian bridge.
B. and D. Tukwila Elementary School and Cascade Elementary School
• Collected transportation count and speed data.
• Met with representatives from the two schools to understand their issues and needs.
• Developed draft set of improvements for both schools.
• In 2024, we will share draft improvements with schools and finalize improvements.
C. Impact Charter School Safety Improvements
• Collected transportation count and speed data.
• ADA and signage design for 148th Street completed in 2022.
• In 2024, we will meet with school representatives and develop improvements.
E. Tukwila Community Center Pedestrian Crossing Safety Improvements
• Project completed. RRFBs installed on 124th Street at 44th Avenue and at 46th Avenue.
F. Macadam Road S Speed and Safety Improvements
• Collected transportation count and speed data.
• Developing list of safety and traffic calming improvements.
G. Southcenter Boulevard/65th Avenue S Pedestrian Safety Improvements
• Completed preliminary design and submitted TIB grant application in 2023.
H. Citywide Residential Speed Limit Review
• Reviewed state and City of Tukwila laws related to citywide speed limits.
• Reviewed case studies for cities that have reduced local street speed limit to 20 mph.
• Documented findings in a draft memo.
• In 2024, we will evaluate select arterials for potential speed limit reductions.
I. S Ryan Way Pedestrian Safety Improvements
• Preliminary design complete.
• In 2024, City will pursue grant funding for improvements.
J. S 144th Street/46th Avenue S ADA Ramps
• Improvements constructed in 2022.
110
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• Draft Transportation Safety Study
completed.
• Conducted public outreach
meetings on 3/22/22 and 4/26/22.
• Submitted WSDOT Pedestrian and
Bicycle Program Grant application
in 5/2022.
• New traffic counts are being done
to evaluate improvements.
• Transportation Safety Study
initiated 5/2022.
• Collecting transportation counts
and speed data before the end of
the school year.
• Improvements are expected to be
installed in 2023.
• Transportation Safety Study
initiated 5/2022.
• Collecting transportation counts
and speed data before the end of
the school year.
• Proposed private development
may provide ADA ramp
improvement on S 146th Street.
• Transportation Safety Study
initiated 5/2022.
• Collecting transportation counts
and speed data before the end of
the school year.
• Improvements are expected to be
installed in 2023.
• Design completed for RRFBs, curb
extensions and ADA ramps at 44th
Avenue S and 46th Avenue S.
• Installation scheduled for summer
2022.
Since 2018, five individual requests for traffic calming have been recorded in the NTCP list of requests; additional traffic
complaints have been made to the City over prior years. Addressing traffic safety concerns in Allentown is a top priority for
the City.
Level 1: Improved signage; radar feedback signs; pavement
marking modifications.
Level 2: Sidewalks; curb extensions; raised crosswalk; traffic
calming; and remove the eastbound right -turn slip lane and
reconfigure the S 124th Street/50th Place S intersection.
Since 2018, 12 traffic calming requests have been made in the Tukwila Hill neighborhood, with a significant number near
Tukwila Elementary School. Common complaints have been about speeding and crosswalk or pedestrian safety.
Additionally, the Council has asked for proactively addressing or anticipating concerns, specifically around school zones.
Some improvements have been made around Tukwila Elementary School already but more improvements are needed.
Level 1: School Zone beacons; improved signage; radar
feedback signs; pavement marking modifications.
Level 2: Curb extensions; RRFB installation; ADA ramp
upgrades; improved illumination.
A request specific to the newly opened Impact Charter School was received in 2019. The request was to provide a signed
school zone, which Tukwila has provided signs marking school crossings on S 148th Street. ADA-compliant ramps have not
been installed at the marked school crossings. The charter school has expanded their site to the north which requires
creating a school zone on S 146th Street and other potential improvements for children's safety. Additionally, the Council
has asked for proactively addressing or anticipating concerns, specifically around school zones.
Level 1: Improved signage for school zones on S 148th Street
and S 146th Street; crosswalk installations.
Level 2: ADA ramp improvements; RRFB installations; curb
extensions.
Since 2018, the Cascade View neighborhood has seen 9 requests for traffic calming. Four of the requests were about
speeding, school crossing and pedestrian safety at locations around the Cascade View Elementary School. 85th Percentile
speeds of "30MPH have been recorded, but analysis is needed to identify if speeding occurs during the 20MPH-active school
zone period. Additionally, the Council has asked for proactively addressing or anticipating concerns, specifically around
school zones.
Level 1: Improved signage for school zones on S 148th Street
and S 146th Street; crosswalk installation.
Level 2: ADA ramp improvements; curb extensions;
enhanced crosswalk treatments.
The City Council has expressed desire for the NTCP to have a proactive element in addressing traffic calming and safety
needs throughout the City. The TCC is a well -utilized facility by the Allentown neighborhood as well as the entire City and
surrounding area. Concerns over the pedestrian crossings on S 124th Street have been raised by staff and residents in the
past, along with the larger complaints of speeding in Allentown. Increasing pedestrian visibility to improve safety in this high -
use area is a recommended top priority for the NTCP.
Level 1: Improve pedestrian crossing signage.
Level 2: RRFB installations; upgrade ADA ramps; curb
extensions; improved illumination.
Study neighborhood -wide volume, speed, classification and
safety issues. Identify and design Level 1 and Level 2
treatments throughout Allentown.
Address pedestrian mobility, crosswalk safety concerns,
speeding, sight distance, and upgrade School Zone signage.
Provide school crossing improvements, establish school zone
on S 146th Street, if needed. Provide school crossing
improvements, observe operating speeds, if necessary
establish speed zone.
Upgrade School Zone signing, design and install pedestrian
crossing improvements.
Install pedestrian safety improvements on
S 124th Street at 44th Avenue S and 46th Avenue S.
A Allentown Neighborhood
Speed and Safety Study
B Tukwila Elementary School
Safety Improvements
C Impact Charter School Safety
Improvements
D Cascade View Elementary
School Safety Improvements
E Tukwila Community Center
Pedestrian Crossing Safety
Improvements
111
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Project Details Potential Treatment Options Status
Estimate Range Estimate Range
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• Design to begin in 2/3Q.
• Funding available for design of full
signal in 2022 CIP.
• Design to begin in 2022.
• Will consider signage
improvements for interim in 2/3Q.
• Not started yet.
• Transportation Safety Study for
improved signage and safety
improvements may begin in 2/3Q.
• Construction of improvements
possible in 2023.
• Design at 50% with construction
to be done with the 2022 Annual
Overlay Project.
At least five requests for traffic calming, specific to speeding (and some secondary reasons) have been made since 2018. A
radar feedback sign was placed near the 13700 block in 2019 but requests have continued to be made. Additional analysis is
warranted to determine what other improvements could be used to address the speeding, especially where Macadam Road
has extremely limited sight distance due to the curvy nature of the roadway.
Level 1: Improved signage; LED chevron signs; channelization
modifications.
Level 2:
Staff identified the need for improvement pedestrian safety at this location several years ago. Southcenter Boulevard is a S-
lane roadway with known speeding issues along with curves that restrict sight distance. A high pedestrian usage at this
intersection accessing the King County Metro bus stop that services both the Rapid Ride F-Line and Route 150, both
workhorses of the south County transit network, justifies improving pedestrian crossing safety. This intersection is slated for
full signalization in the future, but interim pedestrian safety improvements should be considered sooner.
Level 1: Improved signage for pedestrian crossing
Level 2: RRFB installation; ADA ramp upgrades; improved
illumination
As part of the City Council's expressed desire to proactively look at traffic calming needs, a full review of the residential
street posted speed limits is recommended by staff. State law establishes city speed limits at 25MPH unless an engineering
study is completed to justify higher speed limits. Most residential streets are posted at 25MPH today, but there are many
that are posted at 30MPH or 35MPH. Likely, those speed limits are legacies of past annexation areas, where a speed study
was completed by King County. The general impression Staff has is that most residents and elected officials would be
happier with lower speed limits. City of Seattle has also recently lowered all speed limits nearly city-wide to be 25MPH.
Level 1: Modify speed limit ordinance; as needed; install new
signs; as needed.
Level 2:
Two requests for traffic calming to address speeding and pedestrian crossing safety in the Ryan Hill area have been made in
2021. New developments are coming forward that will increase the residential population of this part of the City with multi-
family developments. The speed concerns, especially along S Ryan Way, coupled with the new housing developments
increasing the likelihood of increased pedestrian activity, warrants this analysis be recommended as a top priority.
Level 1: Improved signage.
Level 2: Curb extension, improved illumination.
The Tukwila School District requested school crossing safety improvements at this intersection in 2017. A new Rectangular
Rapid Flashing Beacon was installed in 2019. At the time the RRFB was installed, the City was also submitting a grant
application for the 46th Avenue S Safe Routes to School project, which would improve pedestrian safety between this
intersection south to S 150th Street, and would include either a raised pedestrian crosswalk at the RRFB or install ADA-
compliant curb ramps. The grant was not awarded. State law requires ADA ramps be brought up to current standards
anytime a new signal, including the RRFB, is installed. Since grant monies for the larger improvement are not expected in the
short term, staff recommends this as a priority to comply with all state and federal laws regarding ADA requirements.
Level 1:
Level 2: ADA upgrades to ramps at RRFB (not done at time of
RRFB installation due to budget constraints).
Design and install treatments addressing speeding and curve
safety north of S 144th Street.
Design and install pedestrian safety improvements
Identify residential streets with speed limits currently above
25MPH. Conduct volume, speed and safety review.
Recommend changes to speed limits, as necessary.
Safety study on S Ryan Way from MLK Jr. Way to east city
limits, focusing on speeding and pedestrian safety.
Recommend Level 1 and Level 2 improvements. Design and
construct improvements.
Design and install ADA-compliant ramps at the intersection.
F Macadam Road Speed and
Safety Improvements
G Southcenter Boulevard/65th
Avenue S Pedestrian Safety
Improvements
H City-wide Residential Speed
Limit Review
I S Ryan Way Pedestrian Safety
Improvements
J S 144th Street/46th Avenue S
ADA Ramps
112
S 152nd St o-I-e
S 52nd PI f
m
Wig Blvd Corporate
C porate
Minkler BI¢dr
Upland Dr
City of
Tukwila
S
Not to Scale
Vicinity Map
8 King County
—
Disclaimer:
The location of features and boundaries
are approximate and are intended for
reference only. Data is based on best
information available.
U:\PW Eng\GIS General Maps\Streets_11 x17_Sept2018.mxd
Date: 09/09/18 By: R. Linsao
13
114
TO:
FROM:
BY:
CC:
DATE:
SUBJECT:
ISSUE
Introduce the
City of Tukwila
Thomas McLeod, Mayor
INFORMATIONAL MEMORANDUM
City Council
Hari Ponnekanti, Public Works Director
Cyndy Knighton, Senior Program Manager — Transportation
Thomas McLeod, Mayor
April 12, 2024
Annual Six Year Transportation Improvement Program Primer
annual exercise of developing a Six Year Transportation Improvement Program.
BACKGROUND
The Transportation Improvement Program (TIP) is updated annually as required by the Revised
Code of Washington (RCW) 35.77.010. The TIP is adopted by resolution after a public hearing at the
local agency level and incorporated into regional and state TIPs. The TIP must be done by June 30th
of each year. Once a city or county adopts a local TIP, it is submitted to both the Metropolitan
Planning Organization (MPO) - in Tukwila's case, Puget Sound Regional Council (PSRC) - and the
Washington State Department of Transportation (WSDOT). PSRC and WSDOT synthesize a fiscally
constrained plan with projects of regional significance to be included in the regional TIP.
The Statewide TIP (STIP) is a four-year prioritized multimodal transportation program compiled of
state, local, tribal and public transportation projects that include highways, streets, roads, rail, transit -
hubs, park & rides, bridges, sidewalks, bike lanes, trails and safety. Projects programmed in the STIP
are the highest priority for the available funding, to preserve and improve the state's transportation
network and achieving the national goals established in the Moving Ahead for Progress in the 21 st
Century Act (MAP-21) and continued through the Infrastructure Investment and Jobs Act/Bipartisan
Infrastructure Law (IIJA/BIL) for FFYs 2022-2026.
DISCUSSION
From Tukwila's perspective, the TIP is primarily a financial planning document for projects competing
for grants. Any project submitted for federal grant funding, and some state grant funds, must be
included in the local, regional, and state adopted TIPs. The TIP is a rolling plan showing various
funding sources: grants, developer and local funds. Projects "roll" as funds or stages occur (design
report, final design and construction).
Tukwila's TIP and Capital Improvement Program (CIP) list many of the same transportation -related
projects. The TIP generally lists only those transportation -related projects planned within the next six
years that are deemed regionally significant or that have grant funding awarded or expected. The
TIP is scheduled for adoption on June 26, 2023.
FINANCIAL IMPACT
None.
RECOMMENDATION
Information Only.
ATTACHMENTS
• Current Six Year TIP
https://tukwilawa.sharepoint.com/sites/mayorsoffice/cc/council agenda items/public works/tip intro for 4-14 council worksession/a. info memo - 6 year tip primer 4-15-
24.docx
115
116
Six Year Transportation
Agency: Tukwila
County: King
d)
0
Z
MPO/RTPO: PSRC
RW Required
z
Environmental Type
L
0
0
Total Length
0
0
0
Utility Codes
Improvement Type
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
/ 1037(004) TUK-62
42nd Ave S Bridge Replacement
42nd Ave S over the Duwamish River
Interurban Ave S to Northern end of bridge
Replace the existing 42nd Ave S steel truss bridge. The replacement will require
preliminary engineer design, right-of-way, and construction phases. The new
structure will meet current road and bridge design standards. The replacement
structure configuration will be two through -lanes, possibly a turn pocket, and include
sidewalks.
Priority Number
Functional
Class
o
Total Funds
2,600,000
100,000
28,913,500
0
0
0
ri
M
Local Funds
1,100,000
0
0
1,113,500
L0
State Funds
0
0
17,000,000
17,000,000
State Fund Code
MAW
Federal Funds
O
86,500
O
13,500,000
O
O
0
in
O
O
_r
O
Federal Fund Code
STBG(UL)
m
m
Totals
Phase Start Year (YYYY)
V
V
V
N
O
N
O
N
0
N
N
N
Phase
L
a
1Y
CN
c
Status
CO
CO
CO
FY
c
3
LL
Expenditure Schedule
5th & 6th
0
0
0
o
4th
0
0
0
0
3rd
0
O
13,500,000
13,500,000
2nd
O
O
15,636,500
15,636,500
800,000
O
O
O
O
O
O
O
O
O
O
O
O
N
Phase
L
a
RW
CN
Totals
Report Date: May 04, 2023
117
Six Year Transportation
Agency: Tukwila
County: King
a)
0
Z
MPO/RTPO: PSRC
RW Required
}
Environmental Type
Total Length
0
M
0
Utility Codes
Improvement Type
,
0
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-1111:
46th Avenue Safe Routes to School
46th Avenue S
S 150th Street to S 144th Street
Design and construct curb, gutter and sidewalk on the west side of 46th Avenue S,
including curb bulb -out at the SE corner of 46th Avenue S/S 144th Street with raised
crosswalk across S 144th Street with RRFB.
Priority Number
Functional
Class
0
Total Funds
270,000
240,000
2,070,000
2,580,000
Local Funds
0
20,000
410,000
520,000
0
0
0
rn
State Funds
180,000
220,000
0
2,060,000
0
0
0
CO
0
State Fund Code
SRTS
SRTS
SRTS
Federal Funds
0
0
0
C.
Federal Fund Code
Totals
Phase Start Year (YYYY)
V
V
1-0
N
O
N
O
N
0
N
N
N
Phase
L
a
iy
CN
)
c
v
c
Status
a
a
a
7
LL
Expenditure Schedule
5th & 6th
0
0
0
o
4th
0
0
0
o
o
o
O
O
L
M
2nd
o
o
2,070,000
2,070,000
270,000
240,000
0
510,000
(0
Phase
PE
RW
CN
Totals
Report Date: May 04, 2023
118
Six Year Transportation
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
co
W
Total Length
Utility Codes
Improvement Type
_
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA05409
Allentown Truck Reroute Project
to
Study alternatives for truck access to reroute outside of residential neighborhood.
Priority Number
Functional
Class
00
Total Funds
0
0
0
0
O
0
0
0
0
O
O
Local Funds
0
0
0
0
0
0
0
0
0
0
o
0
O
State Funds
State Fund Code
O
Federal Funds
O
Federal Fund Code
Phase Start Year (YYYY)
N
O
N
J
a
N
re
0)
0)
Expenditure Schedule
O
O
O
O
O
12
L
O
O
O
O
O
0
O
O
O
O
O
O
J
a
N
l6
0
Report Date: May 04, 2023
119
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
Improvement Type
co
O
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-05405
Americans with Disabilities Act (ADA) Improvements
Various locations
to
Design and construct ADA compliant upgrades to City infrastructure in conjunction
with a City developed plan.
Priority Number
Functional
Class
0
o
0
10
Total Funds
0
0
O
0
0
0
co
Local Funds
0
0
0
Lri
O
State Funds
State Fund Code
O
Federal Funds
O
Federal Fund Code
Phase Start Year (YYYY)
J
—J
(0
Expenditure Schedule
Report Date: May 04, 2023
120
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
a)
0
Z
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
co
0
0
0
0i
Improvement Type
co
0
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-07746
Andover Park E/Minkler Blvd Intersection
Andover Park E
Minkler Blvd to
Construct left turn lanes on Andover Park East and reconstruct traffic signal
Priority Number
Functional
Class
m
Total Funds
134,000
0
0
0
0
1,570,000
1,714,000
Local Funds
134,000
10,000
1,570,000
1,714,000
State Funds
0
0
0
0
State Fund Code
Federal Funds
O
O
O
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
2025
2025
2026
Phase
PE
ct
CN
=
c
c
LL
Status
u)
u)
a
Expenditure Schedule
5th & 6th
o
o
O
0
4th
o
o
O
0
3rd
O
O
1,570,000
1,570,000
134,000
O
O
144,000
0
C.
O
C
N
C.
C.
C.
0
N
Phase
L
a
Et
CN
Totals
Report Date: May 04, 2023
121
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
a)
0
Z
MPO/RTPO: PSRC
RW Required
co
Environmental Type
Total Length
0
O
0
Utility Codes
a
Improvement Type
co
0
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-15107
Andover Park East/Industry Dr Intersection
Andover Park E
Industry Drive to
Design and construct traffic signal with Andover Park East left turn lanes and
crosswalks.
Priority Number
Functional
Class
o
Total Funds
75,000
O
0
0
0
657,000
742,000
Local Funds
75,000
10,000
657,000
742,000
State Funds
O
O
O
O
State Fund Code
Federal Funds
O
O
O
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
2025
2025
2026
Phase
PE
Lt
CN
=
c
Status
cn
cn
a
3
LL
Expenditure Schedule
5th & 6th
0
C.
C.
0
4th
0
0
0
0
3rd
O
o
0
657,000
O
O
r
Ln
O
2nd
75,000
0
0
85,000
0
0
O
0
0
C.
0
N
Phase
L
a
Et
CN
Totals
Report Date: May 04, 2023
122
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
Improvement Type
co
O
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-03731
Annual Bridge Inspections and Repairs
Various City Street
to
Perform load ratings and bi-annual inspections as well as construct necessary
repairs and maintenance
Priority Number
Functional
Class
r
Total Funds
0
0
co
co
0
Co
I
M
Local Funds
O
0
O
ui
v
co
O
State Funds
State Fund Code
Co
Federal Funds
Federal Fund Code
Phase Start Year (YYYY)
J
—J
0)
Expenditure Schedule
O
0
.1
N
(0
r
m
(0
l0
a
J
J
N
co
0
Report Date: May 04, 2023
123
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
co
0
0
0
0i
Improvement Type
co
0
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-03733
Annual Overlay and Repair Program
Various City Streets
to
Repair, rehabilitate, and overlay City streets as needed in an annual program
Priority Number
Functional
Class
CO
Total Funds
O
0
co
co
0
0
0
0
co
0
0
Local Funds
0
O
0
0
10
oo
0
0
0
0
cn
co
co
O
State Funds
State Fund Code
O
Federal Funds
Federal Fund Code
Phase Start Year (YYYY)
J
—J
(0
0)
Expenditure Schedule
Report Date: May 04, 2023
124
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
a
Improvement Type
v
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-15104
Annual Traffic Signal Program
Varies
to
Design and construct traffic signal upgrades and repairs of signals that exceed
routine maintenance work;loop replacement, head replacement, and controllers.
Replace direct bury cable for existing lighting system.
Priority Number
Functional
Class
Oo
Total Funds
0
0
0
O
0
0
0
Local Funds
O
O
O
0
0
O
O
O
0
0
0
O
State Funds
O
State Fund Code
O
Federal Funds
O
Federal Fund Code
Phase Start Year (YYYY)
Expenditure Schedule
0
O
O
0
0
co
aa
t
O
0
0
0
O
M
O
O
O
10
L
v
O
O
O
O
O
O
O
12
L
O
O
O
O
M
O
O
O
O
co
O
O
O
O
O
O
O
co
O
O
O
J
J
Report Date: May 04, 2023
125
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
a)
a
0
Z
MPO/RTPO: PSRC
RW Required
co
Environmental Type
Total Length
0
N
O
Utility Codes
co
0
0
0
0i
Improvement Type
co
0
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-15109
E Marginal Way S (BAR - S 112 St)
E Marginal Way S
Boeing Access Road to S 112th St
Design and construct curb, gutter, drainage, lighting, turn lanes, and traffic control.
Priority Number
Functional
Class
o
Total Funds
288,000
700,000
2,430,000
3,418,000
Local Funds
288,000
420,000
1,460,000
2,168,000
State Funds
0
280,000
970,000
1,250,000
State Fund Code
TIB
TIB
Federal Funds
O
O
O
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
2025
2029
2029
Phase
PE
Lt
CN
am
c
Status
a
a
a
3
LL
Expenditure Schedule
5th & 6th
170,000
700,000
2,430,000
3,300,000
4th
o
o
O
0
3rd
O
O
O
0
2nd
O
O
O
50,000
0
C.
O
LS,
C.
C.
C.
0
N
Phase
L
a
Et
CN
Totals
Report Date: May 04, 2023
126
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
0
0
0
0
Utility Codes
Improvement Type
v
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
TUK-63
Keeping South King County Moving with TDM
South King County
Various to Various
This project will help people access sustainable transportation options that reduce
drive -alone travel and traffic congestion in South King County. TDM programming
and services will be provided to residents, workers, visitors, employers, property
managers, and students in Tukwila and the partnering jurisdictions of Burien, Des
Moines, Kent, Renton, and SeaTac. The program will target those willing and able to
try sustainable modes of transportation at activity centers (community hubs,
commercial areas, business parks, multifamily housing complexes, and educational
institutions). Examples of activity centers include the Tukwila International Boulevard
District, Southcenter, and Sea-Tac Airport. The TDM Program will work in partnership
with transit agencies, nonprofits, employers, and community organizations to reach
priority populations through trusted channels. The project aims to reduce 542,997
vehicle trips and 8,093,549 vehicle miles traveled.
Priority Number
Functional
Class
00
Total Funds
672,000
168,000
840,000
Local Funds
0
0
0
State Funds
0
0
840,000
O
0
O
0
N
CO
CO
CO
s—
State Fund Code
WSDOT
OTHER
Federal Funds
O
O
0
Federal Fund Code
Totals
Phase Start Year (YYYY)
V
V
N
C\J
O
N
O
N
13) c
c
c
Phase
ALL
ALL
Status
u)
u)
LL
Expenditure Schedule
O
O
O
O
0
O
O
0
0
0
0
_O
c‘"
m
N
co
a
Report Date: May 04, 2023
127
Six Year Transportation
Agency: Tukwila
County: King
d)
0
Z
MPO/RTPO: PSRC
RW Required
z
Environmental Type
L
0
Total Length
0
1)
co
O
Utility Codes
Improvement Type
v
O
Resolution No.
Amendment
Adopted
co
N
co
0
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-1111(
Macadam Rd S Complete Streets Project
Macadam Road
S 150th Street to S 144th Street
Design and construction of a complete street on Macadam Road. Road widening
and rechannelization to add 5-foot bike lanes and 5-foot sidewalks on both sides of
the roadway. Includes illumination, curb, and storm drainage.
Priority Number
Functional
Class
r
Total Funds
400,000
100,000
3,100, 000
3,600,000
Local Funds
o
300,000
360,000
oo
io
0
0
State Funds
350,000
O
2,800,000
3,240,000
0
0
0
an
State Fund Code
Ped/Bike Program
Ped/Bike Program
Ped/Bike Program
Federal Funds
O
O
O
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
V
V
Lo
N
O
N
O
N
0
N
N
N
Phase
L
a
iy
CN
)
c
v
c
Status
a
a
a
7
LL
Expenditure Schedule
5th & 6th
0
0
0
0
4th
0
0
0
0
0
0
0
0
L
co
2nd
0
0
3,100,000
O
O
0
O
O
M
400,000
O
O
O
0
500,000
O
O
N
Phase
PE
RW
CN
Totals
Report Date: May 04, 2023
128
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
0
0
O
Utility Codes
Improvement Type
co
0
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-13494
S 119th St Pedestrian Bridge Painting
S 119th Street
West bank Duwamish River to East bank Duwamish River
Ongoing maintenance of the S 119th Street Pedestrian Bridge in the
Allentown/Duwamish neighborhoods. Painting of bridge is outstanding maintenance
needed.
Priority Number
Functional
Class
o
Total Funds
0
0
0
O
O
N
0
O
0
O
O
N
0
0
0
0
O
Local Funds
0
0
0
0
O
N
O
State Funds
O
State Fund Code
O
Federal Funds
O
Federal Fund Code
Phase Start Year (YYYY)
N
O
N
Z
0
Vl
ra
a
R
O
H
Expenditure Schedule
O
ogj
t
O
O
L
v
O
O
M
O
O
O
0
O
O
N
O
O
O
O
O
N
O
N
O
m
HJ
as
s
a
Z
0
Report Date: May 04, 2023
129
Six Year Transportation
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
co
Environmental Type
Total Length
0
0
0
Utility Codes
co
0
0
0
0i
Improvement Type
co
0
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-15108
S 133 St/SR599 Southbound Intersection
S 133rd Street
SR 599 SB Ramp to
Design and construct intersection improvements, which could include a new traffic
signal or a roundabout,
lighting, pedestrian facilities, and drainage.
Priority Number
Functional
Class
"o
Total Funds
300,000
50,000
2,070,000
2,420,000
Local Funds
300,000
50,000
2,070,000
2,420,000
State Funds
O
O
O
O
State Fund Code
Federal Funds
O
O
O
0
Federal Fund Code
Totals
Phase Start Year (YYYY)
CO
CO
2029
N
O
N
O
N
N
Phase
L
a
1Y
CN
CD
c
Status
a
a
a
=a
c
a
U.
Expenditure Schedule
5th & 6th
300,000
50,000
2,070,000
2,420,000
4th
o
O
o
O
3rd
O
O
O
O
2nd
O
O
O
O
O
O
O
O
N
Phase
a
ry
CN
Totals
Report Date: May 04, 2023
130
Six Year Transportation
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
W
0
Total Length
0
co
N
o
Utility Codes
Improvement Type
N
Resolution No.
Amendment
Adopted
co
N
co
0
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA03782
S 144th St Bridge Sidewalks
S 144th Street
51 st Ave S to 53rd Ave S
Widen existing sidewalks on bridge over 1-5 between 51 st Ave S and 53rd Ave S
Priority Number
Functional
Class
r
Total Funds
579,000
2,690,000
3,269,000
Local Funds
79,000
388,000
467,000
State Funds
0
0
0
State Fund Code
Federal Funds
500,000
2,302,000
2,802,000
Federal Fund Code
STBG(UL)
SRTS 1
Totals
Phase Start Year (YYYY)
2026
N
0
N
Phase
W
a
CN
)
c
Status
cn
a
=a
c
3
U.
Expenditure Schedule
5th & 6th
0
0
0
4th
0
0
0
0
2,690,000
O
O
co
c\i.
3rd
579,000
0
579,000
2nd
O
O
0
O
O
0
5
a-
C.)
PE
CN
Totals
N
l6
s
a
Ls)
a)
0
Report Date: May 04, 2023
131
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
0
0
co
O
Utility Codes
Improvement Type
,
0
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-1111�
S 152nd Street Safe Routes to School
S 152nd Street
Tukwila International Blvd to 42nd Avenue S
Design and construct curb, gutter and sidewalks on both sides including widening
pavement width by 3 feet to construct on -street parking lane on north side of street.
Priority Number
Functional
Class
as
Total Funds
O
0
115
O
0
0
I
O
Local Funds
0
0
0
115
00
0
O
O
Lri
co
State Funds
O
0
0
0
0
N
M
0
0
O
0
O
N
State Fund Code
m
1-
O
Federal Funds
O
Federal Fund Code
Phase Start Year (YYYY)
Z
U
(0
d
Expenditure Schedule
Report Date: May 04, 2023
132
Six Year Transportation
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
O
O
O
o
Utility Codes
Improvement Type
v
N
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
TUK-64
South King County TDM
South King County
N/A to N/A
This project will provide TDM programming and services at selected activity centers
in Tukwila and partnering South King County jurisdictions. Activity centers include
community hubs, commercial areas, business parks, multifamily housing complexes,
and educational institutions. For example, places such as Tukwila International
Boulevard District, Southcenter, and Sea-Tac Airport. By providing transportation
resources and incentives, the project will encourage people to choose sustainable
transportation options that reduce drive -alone travel and traffic congestion in South
King County. TDM services will be provided to residents, commuters, and visitors,
targeting those willing and able to try sustainable modes of transportation. The
program will work in partnership with partner agencies, nonprofits, employers, and
community organizations.
Priority Number
Functional
Class
o
Total Funds
O
O
Local Funds
N
M
N
Ln
L()
State Funds
State Fund Code
W
1-
0
Federal Funds
Federal Fund Code
0
2
Phase Start Year (YYYY)
N
O
N
a
V)
ra
0)
co
Expenditure Schedule
O
O
O
O
O
12
)
M
O
O
O
J
a
N
0_
Report Date: May 04, 2023
133
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
Utility Codes
Improvement Type
N
Resolution No.
Amendment
Adopted
co
N
co
O
Hearing
co
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-13495
Southcenter Blvd/65th Avenue S Signal
Southcenter Boulevard
65th Avenue S to
Design and construct a new traffic signal at the Southcenter Boulevard/65th Avenue
S intersection to improve level of service and safety.
Priority Number
Functional
Class
o
Total Funds
200,000
0
0
0
1,200,000
0
0
0
Local Funds
200,000
500,000
700,000
State Funds
0
500,000
500,000
State Fund Code
TIB
Federal Funds
O
O
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
V
N
O
N
2025
am
c_
c
3
LL
Phase
PE
CN
Status
a
Expenditure Schedule
5th & 6th
C.
C.
0
4th
C.
C.
0
3rd
C.
C.
0
C.
C.
0
C
N
C.
1,000,000
1,100,000
0
C.
O
O
N
Phase
W
a
CN
Totals
Report Date: May 04, 2023
134
Six Year Transportation
1
ing
C t
Agency: Tukwila
County: King
MPO/RTPO: PSRC
RW Required
z
Environmental Type
Total Length
0
0
O
O
Utility Codes
Improvement Type
v
Resolution No.
Amendment
Adopted
M
N
co
O
Hearing
M
'
N_
O
A. PIN/Project No. B. STIP ID
C. Project Title
D. Road Name or Number
E. Begin & End Termini
F. Project Description G. Structure ID
WA-13491
Transportation Demand Management Implementation
to
Provision of TDM services to Commute Trip Reduction -affected employment sites.
Facilitate employer reporting and records associated with biennial CTR survey.
Engage CTR employment sites with opportunities for improvement and remain
connected via technical meetings with other CTR jurisdictional representatives.
Priority Number
Functional
Class
o
Total Funds
88,526
46,650
135,176
Local Funds
O
O
0
State Funds
(0
46,650
135,176
N
co
O
co
State Fund Code
WSDOT
WSDOT
Federal Funds
co
co
O
Federal Fund Code
Totals
Phase Start Year (YYYY)
V
N
O
N
2025
rn
Phase
ALL
ALL
Status
co
d
'v
c
7
LL
Expenditure Schedule
O
O
O
O
O
O
.1
N
N
J
J
Total Funds
o
O
M
YY
co
co
Local Funds
State Funds
co
O
O
00
N
co
N
Federal Funds
O
0
O
N
O
h
f0
Grand Totals for Tukwila
rn
4)
cn
0
Report Date: May 04, 2023
135
136