HomeMy WebLinkAboutTask Order No. 0663a with CH2M Hill, Inc. for Regulatory Floodway Encroachment Assistance_ CH2MHILL
Meridian Regulatory Floodway Encroachment Assistance
Scope of Work for Task 2
Task Order 0663a
Introduction
Several buildings in the Creek Side Arbour apartment complex are located in the regulatory
floodway of Fivemile Creek. This complex is located west of Fivemile Creek and upstream
of the Fairview Avenue crossing, and is in violation of the National Flood Insurance
Program (NFII') regulations according to the Federal Emergency Management Agency
(FEMA)_In order to address these violations, work completed in 20_06-2007 under a u_ ___
separate task order suggests that channel modifications are necessary. These modifications '
are designed to return site conditions to pre-aparment complex base flood elevations (BFE),
floodway elevations, and floodway widths.
Based on NFIl' regulations and discussions with FEMA as part of the earlier work (Task 1),
the City of Meridian should submit a Lefler of Map Revision (CONK) application that
summarizes existing conditions for Fivemile Creek in the vicinity of the Creek Side Arbour
apartment complex. This Scope of Work (SOW) summarizes the steps needed to develop a
hydraulic technical memorandum (TM) to support the LOMR. This hydraulic TM wiIl build
on earlier hydraulic analyses based on the following models:
Effective Model. This model is the basis of the current flood maps and has been obtained
from FEMA.
• Duplicate Effective Model. This model converted the Effective Model from HEC-2 to
I-iEC-RAS to be consistent with current modeling techniques elsewhere in the
watershed.
• Existing Conditions Model. This model incorporates 2004 floodplain LiDAR information
obtained by the U.S. Bureau of Reclamation. This model also incorporates additional
channel cross-section survey data, the Badley Avenue culvert, and existing culvert
dimension and elevation information for Fairview Avenue collected in 2006.
Existing Conditions Model scenarios have been created under the previous work. This
scope of work assumes that these models will need to be revisited and reviewed for quality
assurance and quality control in order to ensure LOMR application standards. At this time,
no Proposed Conditions Models will need to be developed.
Task 2.0: FloodplainlFloodwayRnalysis
The objective of Task 2 is to develop a hydraulic TM which will provide the basis for a
LOMR application. This TM will summarize field surveys that have been performed since
the effective flood maps were published, and will also present the floodplain/floodway
hydraulic analysis needed for FEMA to approve the LOMR application.
Subtask 2.1-Meetings and Coordination
Up to three meetings are anticipated during Task 2, one of which will involve FEMA.
Meetings are summarized and budgeted in this subtask and outlined in the "Meetings"
heading under the respective subtask.
Meetings:
• One two-hour conference call with City of Meridian attended by two ENGINEER'S staff
to review proposed Scope and Fee.
• One two-hour meeting (or conference call) with City of Meridian to assess the Existing
Conditions Model output.
• One two-hour meeting (or conference call) with FEMA to discuss LOMR application
details attended by two ENGINEER'S staff, and the City of Meridian.
Deliverables:
• Meeting minutes (email) summarizing discussions, decisions made, and action items.
Assumptions:
• ENGINEER will arrange and facilitate all meetings and calls.
• Additional meetings are not anticipated and not included in this current scope and
budget, but can be added if necessary
Subtask 2.2 -Review Floodplain/Floodway Analysis Models
ENGINEER will review the hydraulic models completed under the previous work. This
refinement will consist of the foIiowing:
• Existing Conditions Model. Refinement of this model will consist of reviewing the
earlier modeling work relative to LOMR data quality standards and verify that it passes
the CHECK-RAS standard.
Proposed Conditions Model. This model will reflect proposed modifications to Fivemile
Creek. As summarized in the earlier work, these modifications will likely include a
combination of modifications to the Badley Avenue crossing, applying more realistic
Manning's n values, and/or modifying the stream bed/channel banks within the reach
of concern. We assume that two iterations of the Proposed Conditions Model will be
created based on input from the City. The final Proposed Conditions model must meet
minimum NFIP standards.
Meetings:
• One meeting as described in Task 2.1.
Deliverables:
• HEC-2 and HEC-RAS model files and CHECK-RAS output files.
Assumptions:
• No additional surveying will be required.
• Implications of potential channel changes relative to imgation district
permits/approvals, Corps of Engineers 404 permitting, or other agency approvals will
be coordinated by the City and have not been included in this scope of work.
Subtask 2.3 -Hydraulic Technical Memorandum
ENGINEER wiIl.prepare a hydraulic TM (up_to_15_pages in.length)_documenting_the
additional field information, development of the various hydraulic models, and the results
of the hydraulic modeling. As required by FEMA, the TM will be reviewed and certified
with an Idaho P.E. stamp. Included as part of the TM will be the topographic map,
hydraulic model results in the form of tables, hydraulic profiles, and cross-section views.
Several figures or annotated FIRM maps depicting current and revised floodway and
floodplain boundaries will also be included. These annotated maps will be prepared to
satisfy the LOMR application workmap mapping requirements.
Meetings:
• One meeting as described in Task 2.1.
Deliverables:
• Technical memorandum, with associated tables and maps.
Assumptions:
• The topographic map will be based on the 2004 LiDAR data and the effective cross-
section floodplain dataset.
Subtask 2.4 - FEMA Letter of Map Revision (LOMB) Application
The ENGINEER will coordinate with FEMA staff and prepare a LOMR Application in
accordance with FEMA guidelines. This LOMR will reflect the proposed modifications as
represented and described in the hydraulic TM. The purpose of this LOMB is to obtain a
letter from FEMA verifying that the FIRM maps should be modified to reflect more precise
field conditions. All hydraulic models described in Subtask 2.2 will be included as part of
the LOMR application package. The following FEMA MT-2 forms will provide the
framework for the LOMR application:
Form 1-Overview & Concurrence Form provides the basic information regarding the
revision request and requires the signatures of the requester, community official, and
engineer. This form is required for all revision requests.
Form 2 - Riverine Hydrology & Hydraulics Form provides the basic information on the
scope and methodology of hydrologic and/or hydraulic analyses that are prepared in
support of the revision request. This form should be used for revision requests that involve
new or revised hydrologicand/ or hydraulic analyses of rivers, streams, ponds, or small
lakes.
Form 3 - Riverine Structures Form provides the basic information regarding hydraulic
structures constructed in the stream channel or floodplain. This form should be used for
revision requests that involve new or proposed channeIization, bridges/culverts, dams,
and/or levees/floodwalls.
Meetings:
• One meeting as described in Task 2.1.
Deliverables:
• Draft LOMB Certification Application Package
• Final LOMR Certification Application Package
Assumptions:
• City of Meridian will provide one review of the draft application and provide one set of
consolidated comments to ENGIlVEER.
• ENGINEER will revise the draft application and submit the final application to the City
of Meridian.
• If needed, City will pay LOMB processing fees outside this scope of work.
Subtask 2.5 -Project Management
Efficient project delivery requires a proven project management approach to deliver the
expected products on time and within budget, with no surprises. Successful project
management starts with swell-defined scope of work, level of effort, and schedule for
completion. Qear definition of the products, level of effort anticipated, and schedule-basic
detailed work planning-provides for efficient allocation of resources to complete the
project. Our project manager will establish and maintain the necessary controls to monitor
and measure costs compared to budget and progress compared to schedule. In this way, the
project manager will know the status of work activities and be able to relate these to the
Client Team. In addition, our project manager will ensure that technical oversight and QA
activities are sufficient to provide sound technical and cost-effective solutions.
Monthly reports will be prepared and submitted with the invoices to define the status of
each task. Reports will include decisions made, major events, work completed, and work
anticipated for the next reporting period. A summary of budget status by task and updated
schedule will be included.
Schedule
The estimated schedule is shown below in Table 1.
TABLE 1
.Project Schedule
Task Time of Completion
Notice to proceed November 12th
Hydraulic Modeling Completion December 19'~
Technical Memorandum Completion January 16'"
LOMB Workmap Completion January 30'~
LOMB Application -Draft Submittal February 15'h
LOMB Application~Final Submittal February_27'"
Labor Hours Estimate
Table 2 sumrnari7.Ps the fee for this work described in this scope.
TABLE 2
Proiect Budget
Sub Task Total Hours Total Cost
1. Meeting and Coordination 18 $1,997.32
2. Revise Floodplain/Floodway Models 44 $4,344,82
3. Technical Memorandum 54 $5,583.23
4. LOMB Application 16 $1,602.26
5. Project Management and Administration 24 $2,817.07
Total Hours/Cost 1.52 $18,578.42
CITY OF.MERIDIAN CH2M HILL
BY: ~~~~G%GC/v `Yti~la~
TAMMY de WEER ,MAYOR BY: ~i
Dated: - - (7~ Dated: ~ ~ ~ ~ b
Approved by City Council:
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Attest:
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JAYCEE L. LMAN, CITY~LE K SEAY~
Approved as to Content ~'~% r9 ~P~
KEITH U HASING~/AGENT
Dated: l~~ 2- ~ O
Approved as to Form
CITY ATTORNEY
Department
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NAME: QC/ul~ ~i • 1X,y1I~~
TITLE: ~~.~~ r~q ~et~~-;c:a~
Dated: f Z- 2 "• ZIDO