HomeMy WebLinkAboutUtilities 2016-10-25 Item 2A - Contract Supplement #1 - Tukwila 205 Levee Certification Phase II with Northwest Hydraulic ConsultantsCity of Tukwila
Allan Ekberg, Mayor
INFORMATIONAL MEMORANDUM
TO: Utilities Committee
FROM: Bob Giberson, Public Works Director
BY: Ryan Larson, Senior Program Manager
CC: Mayor Ekberg
DATE: October 21, 2016
SUBJECT: Tukwila 205 Levee Certification
Project No. 91341203, Contract No. 14 -164
Supplemental Agreement No. 1 for Phase 2
ISSUE
Approve Supplemental Agreement No. 1 to Contract No. 14 -164 with Northwest Hydraulic Consultants, Inc.
(NHC) to provide levee certification services for the Tukwila 205 Levee Certification.
BACKGROUND
The Tukwila 205 Levee is located on the left bank of the Green River between S 196th St and 1 -405 and provides
flood protection to the Tukwila Urban Center. The Corps of Engineers provided letters of levee certification as
needed to certify that the levee met their minimum design standards. In July of 2012, the Corps notified the City
that due to a change in their policy, they would no longer provide levee certification for this or any federal levee
and that the current levee certification would expire in August of 2013.
Levee certification is critical because it provides documentation that the levee meets minimum federal standards
and allows FEMA to map the protected area as outside of the 100 -year floodplain. In late 2014, the City hired
NHC to perform the first phase of a certification effort that included an engineering analysis in accordance with
FEMA requirements. This analysis looked at the entire levee system to determine which segments did not meet
FEMA requirements. The results of the Phase 1 study revealed that the levee does not meet minimum free board
requirements in 14 segments and that embankment, foundation, and stability issues are present.
DISCUSSION
Phase 2 of this certification effort will look at each of the areas identified in Phase 1, collect additional site
information, develop alternatives for correcting the deficiencies, and develop costs estimates. Phase 1's contract
was for $447,711, yet the total spent was only $325,611.08. NHC's contract supplement for Phase 2 is
$316,768.00, bringing the total contract amount to $642,379.08.
FISCAL IMPACT
Tukwila 205 Levee Certification Phase 2 funding is budgeted in 2016 with $100,000 and $217,000 proposed in
the 2017 CIP. The $100,000 from 2016 will need to be transferred to 2017 as Phase 2 work will begin in 2017. A
new Proposed 2017 CIP sheet for the Tukwila 205 Levee is attached.
RECOMMENDATION
Council is being asked to approve Supplemental Agreement No. 1 to Contract No. 14 -164 with NHC, Inc. for
Phase 2 of the Tukwila 205 Certification in the amount of $316,788.00 and consider this item at the November
14, 2016 Committee of the Whole meeting and subsequent November 21, 2016 Regular Meeting.
Attachments: CIP Page 100, Proposed 2017 CIP and new Proposed CIP sheet
NHC Supplement No. 1, Scope of Work and Fee Estimate
W: \PW Eng \PROJECTS\A- DR Projects \Tukwila 205\205 Certification (91341203) \Phase 2 \Info Memo Sup #1 102116 gl.docx
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CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2017 to 2022
PROJECT: Tukwila 205 Levee Certification Project No. 91341203
DESCRIPTION: Obtain levee certification for the Tukwila 205 Levee.
The US Army Corps of Engineers no longer provides levee certification services to federally authorized
JUSTIFICATION: levees. The existing certification expired in August of 2013. Certification is required for the Federal
Emergency Management Agency to accreditate the levee system as providing a 100 -year level of
flood protection.
STATUS: Consultant hired in 2014 for Phase I that includes an initial study and identification of levee deficiencies.
MAINT. IMPACT: Certification process is expected to lead to additional levee repair projects that are required to meet the
certification criteria. Certification is valid for a 10 -year period.
The initial phase of the certification process will determine needed repairs and cost estimates. Costs
COMMENT: listed in 2017 through 2019 are estimates for potential repairs that would be grant dependent. King
County Flood Control District's Opportunity Grant Program currently has $63k per year.
FINANCIAL Through Estimated
(in $000's)
2015 2016 2017
2018
2019
2020
2021
2022
BEYOND TOTAL
EXPENSES
Certification Phase I
350
350
Certification Phase II
100
217
220
537
Design
275
275
Const. Mgmt.
30
115
600
745
Construction
200
750
4,000
4,950
TOTAL EXPENSES
350
100
447
1,360
4,600
0
0
0
0
6,857
FUND SOURCES
KC Flood Control
113
63
63
63
63
63
63
63
63
617
Proposed Grants
150
780
4,500
5,430
Mitigation Actual
0
Mitigation Expected
0
Utility Revenue
237
37
234
517
37
(63)
(63)
(63)
(63)
810
TOTAL SOURCES
350
100
447
1,360
4600
0
0
0
0
6,857
Project Location:
Entire System
2017 - 2022 Capital Improvement Program
100
2
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2017 to 2022
PROJECT: Tukwila 205 Levee Certification Project No. 91341203
DESCRIPTION: Obtain levee certification for the Tukwila 205 Levee.
The US Army Corps of Engineers no longer provides levee certification services to federally authorized
JUSTIFICATION: levees. The existing certification expired in August of 2013. Certification is required for the Federal
Emergency Management Agency to accreditate the levee system as providing a 100 -year level of
flood protection.
STATUS:
MAINT. IMPACT: Certification process is expected to lead to additional levee repair projects that are required to meet the
certification criteria. Certification is valid for a 10 -year period.
The initial phase of the certification process will determine e' d ae s d cc e.Ir es. Costs
COMMENT: listed in 2017 through 2019 are estim .es fo rte 'ep rs ti t gra pe..uent. King
County Flood ControDistrict's Opp iity Gr it . it ,ur _ $f k per year
Consultant hired in 2014 for Phase I that includes an initial study and identification of levee deficiencies.
FINANCIAL
(in $000's)
11
20.o 2017 2018
2019
2020
2021
2022
BEYOND TOTAL
EXPENSES
Certification Phase I
350
3
353
Certification Phase II
317
220
537
Design
275
275
Const. Mgmt.
30
115
600
745
Construction
200
750
4,000
4,950
TOTAL EXPENSES
350
3
547
1,360
4,600
0
0
0
0
6,860
FUND SOURCES
KC Flood Control
113
63
63
63
63
63
63
63
63
617
Proposed Grants
150
780
4,500
5,430
Mitigation Actual
0
Mitigation Expected
0
Utility Revenue
237
(60)
334
517
37
(63)
(63)
(63)
(63)
813
TOTAL SOURCES
350
3
547
1,360
4600
0
0
0
0
6,860
Project Location:
Entire System
2017 - 2022 Capital Improvement Program
100
3
City of Tukwila
6200 Southcenter Boulevard, Tukwila WA 98188
Agreement Number:
CONTRACT FOR SERVICES
Amendment # 1
Between the City of Tukwila and Northwest Hydraulic Consultants, Inc.
That portion of Contract No. 14 -164 between the City of Tukwila and Northwest Hydraulic,
Inc. is amended as follows:
Section 2: Scope of Services
The consultant agrees to perform the additional services, identified on Exhibit "Al"
attached hereto, including the provision of all labor, materials, equipment, and supplies.
Section 3: Duration of Agreement; Time for Performance
This Agreement as amended shall be in full force until December 30, 2018, unless sooner
terminated under the provisions of the agreement. Work under this Agreement shall
commence upon written notice by the City to the Consultant to proceed. The Consultant
shall perform all services and provide all work product required pursuant to this agreement
no later than December 30, 2017 unless an extension of such time is granted in writing by
the City.
Section 4: Payment
A. Payment for the work provided by the Consultant shall be made as provided on Exhibit
"B1" attached hereto, provided that the total amount of payment to the Consultant shall
not exceed $642,399.00 without express modification of the Agreement signed by the
City.
All other provisions of the contract shall remain in full force and effect.
Dated this
day of , 20
CITY OF TUKWILA CONTRACTOR
Allan Ekberg, Mayor Todd Bennett, Branch Manager
ATTEST /AUTHENTICATED APPROVED AS TO FORM
Christy O'Flaherty, MMC, City Clerk City Attorney
Page 1 of 1
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nhc
EXHIBIT Al
16300 Christensen Rd., Ste. 3501 Seattle, WA 98188 1 206.241.6000 1 www.nhcweb.com
northwest hydraulic consultants
TUKWILA 205 LEVEE CERTIFICATION
PHASE 2 - ALTERNATIVES ANALYSES FOR LARGE SCALE IMPROVEMENTS
SCOPE OF WORK
Prepared by Northwest Hydraulic Consultants Inc.
for the City of Tukwila Department of Public Works
October 19, 2016
OVERVIEW
The City of Tukwila (City) Department of Public Works has selected Northwest Hydraulic Consultants Inc.
(NHC), with their subconsultants AMEC Environment and Infrastructure, Inc. (AMEC) and KPG, to provide
professional engineering consulting services to evaluate and certify the Tukwila 205 Levee in accordance
with Federal Emergency Management Agency (FEMA) requirements (44 CFR Section 65.10). The 4.6-
mile -long levee is located on the left bank of the Green River between 1 -405 and South 196th Street and
includes the cutoff levee to Southcenter Parkway. Engineering services generally consist of researching
records, conducting inspections, performing structural, geotechnical, seismic, and hydraulic analyses,
preparing detailed reports of the current levee system, providing an analysis and report of needed
improvements, and working with the City to provide engineering plans, specifications, and cost
estimates for the improvements. Work may include engineering services during construction for any
required improvements, such as inspection and change management support under the direction of the
City's project manager. Once the levee is deemed certifiable, work will include providing the necessary
reports and documentation to certify that the levee provides protection from the base (1 percent annual
chance) flood in accordance with FEMA guidelines.
This is a multi -phase project. "Phase 1— Engineering Analyses and Improvement Identification" collected
data, performed analyses required under 44 CFR 65.10, and identified deficiencies. This work indicated
that steep bank slopes throughout the reach significantly limit the ability to certify the levee as -is. As
such, "Phase 2 - Alternatives Analyses for large Scale Improvements for Large Scale Improvements" will
identify if there are alternative options to evaluate the existing case, and then, if still deemed that the
levee can't be certified as -is, evaluate options that will certify the levee by selecting a preferred
alternative and developing conceptual level construction plans. These complex fixes will move the
project into permitting, design, and construction in "Phase 3 - Large Scale Improvements ". "Phase 4 -
Certification Submittal" will provide the documentation necessary to certify the Tukwila Levee and
include an Operations and Maintenance Manual, of which the basis will be the existing U.S. Army Corps'
(Corps) approved manual, but also will adopt other recent policies and procedures, if appropriate, such
as those from King County's ongoing System -Wide Improvement Framework (SWIF) assessment for the
Green River. After completion of Phase 2, the specific task work to be completed in Phases 3 through 4
will be refined and a cost estimate to complete this work will be prepared.
water resource specialists
5
PHASE 1- ENGINEERING ANALYSES AND IMPROVEMENT IDENTIFICATION
The Scope of Work (SOW) for Phase 1 defined Tasks 1 through 8 to complete the engineering analyses
needed to certify the Tukwila 205 Levee in accordance with FEMA requirements (44 CFR Section 65.10),
and identify any physical improvements necessary to certify the levee. Specific assignments and
deliverables have been listed for each task, including who is responsible for certifying compliance with
each section of 65.10.
PHASE 2 - ALTERNATIVES ANALYSES FOR LARGE SCALE IMPROVEMENTS
Phase 2 will conduct the alternatives analyses for the large, complex improvements necessary to certify
the levee. Any small -scale fixes determined in Phase 1— for instance where the solution is obvious and
no permitting is required, such as raising the levee slightly to gain the necessary freeboard — will be
incorporated into the large -scale improvements. Phase 3 will address design, permitting, and
construction of large, complex improvements. The Phase 3 SOW will be refined after the completion of
Phase 2. A Phase 3 cost estimate will then be prepared and submitted to the City.
TASK 9. SITE SPECIFIC ENGINEERING ANALYSES
This task will collect additional data, evaluate methods, and conduct additional (or refine existing)
analyses to determine if the levees can be certified as -is. Phase 1 conducted a reach -wide assessment of
the levees using generalized information. More site specific details and review of levee sections in finer
detail, may indicate that portions can be certified as -is and not need a constructed fix. The project team
will discretize the project reach based on common characteristics and determine how Phase 1
engineering analyses could be refined for these sections. The team will then collect additional data and
refine the engineering analyses if it is deemed that they could provide the technical backing to certify
discrete sections of the levee. The City will be engaged, and meetings will be held as necessary at
regular intervals during the task work.
NHC will lead this effort, with both NHC and AMEC evaluating and refining the analyses as needed. It is
anticipated that AMEC will lead the effort to collect more detailed site characterization through cone
penetration test (CPT) probes. The CPT probes are a less costly exploration method than boring, but still
provide a continuous log of the soil profile when correlated with Phase 1 information. KPG will conduct
detailed channel bank information at up to eight cross - sections and, if requested, will collect additional
survey data in key areas up to the allotted level of effort budgeted.
ASSIGNMENTS
NHC: Evaluate and refine hydraulic engineering analyses. Assemble summary document.
AMEC: Evaluate and refine hydraulic geotechnical analyses.
KPG: Topographic survey.
City: Provide assistance as needed.
DELIVERABLES
• Documentation of sections of the levee that can be certified as -is without a constructed fix.
TASK 10. ALTERNATIVES ANALYSIS — LARGE SCALE PROJECTS
Phase 1 identified that projects of a larger and more complex scale are likely necessary to certify the
levee. For larger projects, an initial alternatives assessment will be conducted by the consultant team.
Page 2 of 6 Tukwila 205 Levee Certification Scope of Work — 10/19/16
City of Tukwila Department of Public Works
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Alternatives will be assessed for each project using objectives and performance metrics developed in
conjunction with the City. A recommended alternative will be selected and presented to the City for
approval prior to beginning Phase 3 work.
NHC will lead this task. NHC and AMEC will first determine potential alternative construction fixes that
will lead to the levee being certified and then determine approximate construction costs for each
alternative with KPG assistance. For each levee section characterized, NHC and AMEC will determine
the evaluation criteria with the City, evaluate the alternatives accordingly, and provide a recommended
alternative to the City during an in- person meeting. Once a preferred alternative is selected, the project
team will develop conceptual level designs for each levee section.
ASSIGNMENTS
NHC: Lead alternatives analysis and conceptual design. Develop alternatives. Provide hydraulic
support. Document work.
AMEC: Assist with developing alternatives. Provide geotechnical support.
KPG: Assist with developing alternatives and preliminary cost estimates.
City: Provide input on alternatives assessment metrics and preferred alternative.
DELIVERABLES
• Alternatives assessment documentation for discrete levee sections including methodology, selection
criteria, and preferred alternative with a conceptual design.
COST ESTIMATE
The total estimated cost to complete Phase 2 (Tasks 9 and 10) is $316,788 as detailed in Exhibit B,
"Phase 2 Cost Estimate 10/14/2016 ".
PHASE 3 - LARGE SCALE IMPROVEMENTS
Phase 3 will provide civil design and construction support of the preferred design determined in Phase 2
for large- scale, complex physical deficiencies. Meetings will be held as needed. The SOW for Phase 3
will be refined at the completion of Phase 1, and a cost estimate prepared.
TASK 11. CIVIL DESIGN AND CONSTRUCTION SUPPORT— LARGE SCALE
KPG will take the lead on plans, specifications, and engineering to develop and resolve deficiencies. NHC
and AMEC will provide specifications and direction on key hydraulic and geotechnical design features.
KPG will provide construction management services for the projects.
ASSIGNMENTS
NHC: Provide hydraulic technical input based on work completed in prior tasks.
AMEC: Provide geotechnical input based on work completed in prior tasks.
KPG: Lead efforts for construction of physical deficiency corrections including creating PSE and
providing construction support.
City: Provide assistance as needed.
DELIVERABLES
• Full PSE packages suitable for bid letting. Construction management documentation as required.
Page 3 of 6 Tukwila 205 Levee Certification Scope of Work — 10/19/16
City of Tukwila Department of Public Works
7
TASK 12. ENVIRONMENTAL /PERMITTING
Capital improvements required to address deficiencies will likely require obtaining permits. If work is
required on the riverward side of the levee, federal permits triggering ESA consultations may be
mandatory. AMEC will provide permitting support for any required capital projects if requested by the
City.
ASSIGNMENTS
NHC: Hydraulics support for permitting.
AMEC: Provide permitting support as needed for the project.
KPG: Civil design support for permitting.
City: No assignments under this task.
DELIVERABLES
• Permit submittal packages as required to meet environmental /permitting needs.
PHASE 4 - CERTIFICATION SUBMITTAL
Once all deficiencies have been identified and corrected, the Tukwila Levee Certification report will be
prepared for submittal. The SOW for Phase 4 will be refined at the completion of Phase 1, and a cost
estimate prepared.
TASK 13. OPERATIONS PLANS AND CRITERIA DOCUMENTATION
An Operations and Maintenance (O &M) manual to meet FEMA requirements for the levee (CFR 65.10.c)
will be created, primarily by combining existing manuals. The basis of the manual will be the existing
Corps' approved manual, but will also adopt other recent policies and procedures, if appropriate, such
as those from the ongoing King County SWIF process, (on which NHC is part of the consultant project
team). Additions may be necessary where other infrastructure — particularly bridge embankments —
serve as part of the levee system, but are not considered by the Corps as part of their project, and hence
are not addressed in the existing manual. The O &M manual must also address the stormwater system
that provides interior drainage for the City; therefore, all the City's pump stations will need to be
addressed.
FEMA requires clear ownership of the levee system be demonstrated. As the Washington State
Department of Transportation (WSDOT) owned 1 -405 bridge embankment is high ground and the
downstream tie -in, an inter - jurisdictional agreement will need to be made between the City and
WSDOT. Kent and WSDOT have recently determined a method to address the issue within the City, and
we expect the same process to be followed. This task is required to be led by the City, but the
consultant team will provide the technical materials needed.
ASSIGNMENTS
NHC: Prepare documentation (including references to existing manuals) to meet CFR 65.10.c
requirements.
AMEC: Assist with document preparation.
KPG: No assignments under this task.
City: Assist with providing existing O &M manuals. Lead inter - jurisdictional agreement at downstream
tie -in to high ground.
Page 4 of 6 Tukwila 205 Levee Certification Scope of Work — 10/19/16
City of Tukwila Department of Public Works
8
DELIVERABLES
• Draft and final versions of O &M report.
• Technical materials for inter - jurisdictional agreement at downstream tie -in.
TASK 14. REFINE ENGINEERING ANALYSES
Engineering analyses conducted in Phase 1 may need to be refined to reflect any constructed levee
improvements, and demonstrate that the levee meets certification requirements. The project team will
revise the Phase 1 analyses, as needed, and update the documentation for the levee certification.
ASSIGNMENTS
NHC, AMEC, and KPG: Revise Phase 1 engineering analyses, as needed.
DELIVERABLES
• Final documentation of engineering analyses.
TASK 15. PROJECT DOCUMENTATION SUBMITTAL AND REVIEW
Once all technical analyses are complete and any deficiencies addressed, a certification report package
will be prepared. NHC will take the lead to prepare this document and combine reports, as -built plans,
and other required files. The certification document will be combined with others from the City (that
are related to the O &M manual) into a final report and submitted to FEMA. The project team will
address review comments provided by FEMA.
Whether the project report is submitted as a Conditional Letter of Map Revision (CLOMR) through
FEMA's consultant, STARR, or directly through local FEMA Region X for review, will be determined
during the project. NHC will engage FEMA Region X early in the project to determine which of these
paths is most likely.
ASSIGNMENTS
NHC: Prepare submittal package to meet CFR 65.10.c requirements.
AMEC: Assist with document preparation.
KPG: Assist with document preparation.
City: Assist with document preparation, including providing required City signatures and formal
authorizations.
DELIVERABLES
• Draft project documentation.
• Final project documentation.
Page 5 of 6 Tukwila 205 Levee Certification Scope of Work — 10/19/16
City of Tukwila Department of Public Works
9
SCHEDULE
A tentative schedule for Phase 2 is shown below, assuming notice to proceed occurs near November 1,
2016. Timing for work beyond Phase 2 will depend heavily on the number and complexity of any fixes
needed to obtain levee certification. Based on Phase 1 work, these could be significant. The schedule
for completing final design, and construction of the larger, more complex projects in Phase 3, will be
better known once Phase 2 is complete.
2016 2017
J F M A M J J A S O N DJ F M A M J J A S O N D
PHASE 2
Task 9. Site Specific Engineering
Analyses
Task 10. Alternatives Analysis - Large
Scale
Page 6 of 6 Tukwila 205 Levee Certification Scope of Work — 10/19/16
City of Tukwila Department of Public Works
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EXHIBIT B1
PHASE 2 COST ESTIMATE 10/19/2016
Cost Estimate
Northwest Hydraulic Consultants Inc.
16300 Christensen Road, Suite 350
Seattle, WA 98188
Tel. (206) 241 -6000
Fax (206) 439 -2420
Labor Deta
Task Description
Principal 5r. Engr. Engineer Jr. Engineer GIS /CAD Finance Document
Analyst Manager Prod.
Labor
Total
Prepared for: Ryan Larson, City of Tukwila
Project: Tukwila Levee Certifcation
Project No.: P2000098
Prepared By: Todd Bennett, NHC
Date: 10/19/16
Direct
Expenses
Subs
Total Task Cost
9 Site Specific Engineereing Analyses
10 Alternatives Analysis - Large Scale Projects
40
40
60
80
110
190
40
70
100
2
2
4
4
$ 42,564.77
$ 63,757.44
$ 109,644.95
$ 100,821.02
$ 152,210
$ 164,578
Total Hours
80.0
140.0
300.0
40.0
170.0
4.0
8.0
Cost Based Rates (2017, 199.04% OH, 12% fee)
$ 237.62
$ 191.17
$ 136.31
$ 97.16
$ 85.94
$ 129.44
$ 80.28
Total
$ 106,322.21
0.00
$ 210,465.97
$ 316,788
Direct Expenses
Description Task
Units
Rate
Cost
Mileage
Color Photo Copies (8.5" x 11 ")
Color Photo Copies (11" x 17)
0
0
0
$ 0.54
$ 1.00
$ 2.00
$ 0.00
$ 0.00
$ 0.00
Total Direct Expenses:
$ 0.00
Subconsultants
Finn Task Sub Expense Markup
Cost
AmecFW 9 $ 84,489.00 10%
AmecFW 10 $ 63,778.00 10%
KPG 9 $ 15,188.23 10%
KPG 10 $ 27,877.48 10%
$ 92,937.90
$ 70,155.80
$ 16,707.05
$ 30,665.22
Total Subconsultants:
$ 210,465.97
Cost Summary
Description
Cost
Total Labor
Total Direct Expenses
Total Subconsultants
$ 106,322
$ 0
$ 210,466
Total Project Cost:
$ 316,788
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