HomeMy WebLinkAboutCDM Smith, Inc. Gee Creek Flood Evaluation Task Authorization #3 (Hurricane Irma) TASK AUTHORIZATION NO. 3
FOR
GEE CREEK FLOOD EVALUATION—CONCEPTUAL ALTERNATIVES IDENTIFICATION
This Task Authorization,when executed,shall be incorporated in and become part of the Agreement for
Professional Services between the City of Winter Springs(CITY), and CDM Smith Inc. (ENGINEER),dated
February 26,2015 hereafter referred to as the Agreement.
I. PROJECT BACKGROUND
As a result of Hurricane Irma which occurred on September 101h&11th, 2017,the CITY received close to
14 inches of rainfall in a 10-hour period and experienced significant flooding along Gee Creek,which
flows through portions of the CITY(Figure 1) and is a tributary to Lake Jesup. Based on discussion and
field visit with the CITY,the areas of concern where flooding occurred appear to include the following:
1. Moss Park—Gee Creek crossing at Moss Road near Dolphin Avenue
2. Alton Road-Gee Creek crossing at Alton Road near Lido Road
3. Northern ends of Lido Road, Holiday Road,and Mockingbird Lane
4. Flooding at 109 Lido Road (low point in road)
S. Hacienda Village Mobile Home Park—Gee Creek crossing at Costa Rica Drive near Casa Grande
Drive and intersection of Costa Rica Drive and La Vista Drive
6. North end of Holiday Lane(end of city right-of-way)
7. Gee Creek crossings at Murphy Road, Edgemon Avenue, Hayes Road,Shore Road and State Road
434
8. Little Lake Howell Creek at Winding Hollow Blvd
The CITY would like to evaluate potential structural improvements and operation and maintenance
(0&M)activities(if any)to improve the flooding level-of-service(LOS) provided by the CITY in the Gee
Creek Basin.This Task Authorization includes an assessment to evaluate potential causes of flooding
based on existing information and identify conceptual solutions to alleviate the flooding along areas in
Gee Creek.
II. SCOPE OF WORK
The following tasks define the Scope of Work for the Gee Creek Flood Study. The tasks to be provided
by the ENGINEER include data collection,field reconnaissance, identification of potential causes of
flooding and identification of conceptual alternatives that can be considered to alleviate flood stages for
the eight identified flood problem locations(listed above).
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Figure 1 Gee Creek
TASK 1-FIELD DATA COLLECTION AND REVIEW
Subtask 1.1- Data Compilation
The ENGINEER will compile and review available data related to the Gee Creek Basin as well as areas
upstream and downstream of the eight flooding locations previously identified. The focus of the
evaluation will be on the areas within the City limits.
Topographic Data and Digital Elevation Model(DEM) Development—The ENGINEER will compile
topographic data and create an initial DEM based on 1-foot topographic data available from the St.
Johns River Water Management District.The ENGINEER will compile topographic data consisting of
contours into a project geodatabase.All vertical elevations will reference the North American
Vertical Datum of 1988(NAVD88).The horizontal datum for all deliverables will reference NAD 83
State Plane Florida East.
mi Geographic Information System (GIS) Data-The ENGINEER will compile existing GIS data including
CITY parcels, roads, land use, political boundaries,soils,watersheds, hydrography,and Federal
Emergency Management Agency(FEMA)floodzone map data.The CITY will provide the requested
existing GIS base files.
is Aerial Photography-The ENGINEER will compile available aerial photography provided by the CITY
and other free-of-charge government agencies(e.g., FDOT).
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Environmental Resource Permit(ERP) Documents—The ENGINEER will compile ERP documents
available from the St.Johns River Water Management District(SJRWMD) related to the project
flooding locations.This will be limited to an internet search and download using the online ERP
mapping tool (i.e., no onsite file review). In particular, previous modeling data,drainage maps,
grading plans, pond detail, control structure detail sheets, and geotechnical reports will be reviewed
for pertinent data.
in Plans Review-The ENGINEER will compile and review available as-built drawings and construction
plans provided by the CITY related to the project flooding locations. This includes plans data for
subdivisions and major roads at the three areas of concern.
is Hydrologic Data-The ENGINEER will compile and review available hydrologic data (i.e., rainfall and
water surface elevation data)from the SJRWMD and Seminole County, FL related to the Hurricane
Irma event.
in Existing Studies-The ENGINEER will review completed studies for the Gee Creek Basin provided by
the CITY. Additionally,the ENGINEER will review the Gee Creek Basin Engineering Study and
Drainage Inventory(1996) previously obtained from the Seminole County website by the ENGINEER.
This will include review of the Gee Creek hydrologic and hydraulic model results presented in the
report.
Subtask 1.2- Field Reconnaissance
The ENGINEER will perform a two-day field reconnaissance to visit each of the identified flooding
locations and walk portions of the upstream and downstream system. The ENGINEER will take
photographs and note any obvious deficiencies and maintenance concerns along the creek. The
ENGINEER will coordinate with the CITY to get permission to access areas within and behind residential
areas.
TASK 2- CONCEPTUAL ALTERNATIVES
Subtask 2.1- Conceptual Alternatives Identification
Based on review of the data compiled under Task 1,the ENGINEER will then evaluate each of the
flooding areas to identify potential causes of flooding for each. The ENGINEER will recommend up to
two general types of improvements at each location that may be implemented to help reduce flood
stages.These can be of a structural or non-structural nature and may include regional projects, retrofits,
expansion or modification of existing stormwater facilities,or other projects as appropriate. These
improvements will be conceptually sited for each of the areas of concern. For each recommended
project,the ENGINEER will prepare a conceptual sketch and project description using the GIS software
Arcview. Each recommended conceptual improvement will be shown in plan view on a 11"x 17" project
base map showing the general location and details of the proposed improvements.This conceptual
sketch will include approximate dimensions and locations of the recommended improvement. The
conceptual improvement plan will be submitted to the CITY for review and comment. The CITY's review
comments will be incorporated into the final conceptual improvement plan. The conceptual
improvement plan will not be used as final design and/or construction documents. Detailed
hydrologic/hydraulic(H/H) modeling will not be performed as part of the conceptual improvement plan.
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Subtask 2.2- Conceptual Cost Estimates
For each recommended alternative identified in Subtask 1.2,the ENGINEER will prepare an Engineer's
Opinion of the Probable Construction Cost,which will include the estimated probable cost of
construction,engineering, permitting,and appropriate contingencies.
TASK 3-TECHNICAL MEMORANDUM
The ENGINEER will document the results of Tasks 1 and 2 in a technical memorandum (TM).The TM will
summarize the data collection and evaluation effort,field reconnaissance,and recommended
conceptual improvement plan.The ENGINEER will provide the technical memorandum (TM) in Adobe
PDF format.The ENGINEER will meet with the CITY to discuss the results of the Draft TM. Based on
comments received from the CITY,the ENGINEER will work to incorporate review comments and finalize
the TM.
TASK 4- MEETINGS AND PROJECT QUALITY MANAGEMENT
Activities performed under this task consist of those general functions required to maintain the project
on schedule,within budget,and that the quality of the work products defined within this scope is
consistent with ENGINEER's standards and CITY's expectations.Specific activities included are identified
below:
Subtask 4.1- Project Kick-Off and Progress Meetings
The ENGINEER will prepare for and conduct a kick-off meeting for the project.The ENGINEER will
prepare and distribute summary meeting notes for the kick-off meeting.This task also includes two
project status review management meetings.The first is a project status meeting to discuss conceptual
recommended alternatives(Task 2)and the second is a meeting after the submittal of the TM (Task 3)to
discuss the CITY's review comments. ENGINEER will prepare meeting notes for each meeting as
appropriate.
Subtask 4.2- Project Quality Management
The ENGINEER maintains a quality management system (QMS)for CITY projects performed by
ENGINEER.Technical reviews of deliverables are budgeted for and will be performed to review various
milestone submittals.
Subtask 4.3- Project Status Reports
ENGINEER's project manager will prepare and submit monthly written status reports for an anticipated
project life of four months.
DATA OR COORDINATION ASSISTANCE TO BE PROVIDED BY THE CITY
1. Existing GIS shape files.
2. Existing modeling reports and files.
3. ERP or other design/construction/as-built drawings.
4. Known issues of concern.
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III. ASSUMPTIONS
The above described engineering services have been based upon the following assumptions:
1. This Task Authorization does not include detailed H/H modeling or LOS evaluations.
2. Flood reduction benefits will not be quantified as part of the conceptual improvements.
3. The conceptual improvements will not be used as final design and/or construction documents.
4. No design or permitting services are included in the Task Authorization.
5. Surveying and geotechnical services are not included in this Task Authorization.
IV. DELIVERABLES
ENGINEER will provide the following deliverables to the CITY:
1. Meeting to discuss conceptual alternatives(Task 2)
2. Draft and Final TM and one meeting with CITY to discuss TM (Task 3).
3. One compact disk containing final project deliverables(Task 3).
4. Meeting notes from project kickoff/status meeting with the CITY(Subtask 4.1).
5. Project status reports(subtask 4.3).
V. TIME OF COMPLETION SCHEDULE
The total duration for completing the ENGINEER's services required under this Task Authorization is four
months from the date of the Notice to Proceed. A tentative schedule is attached and will be updated
based on when the Notice to Proceed is issued.
VI. COMPENSATION AND PAYMENT
The CITY agrees to pay the ENGINEER for completed tasks on a lump sum in the amount of$50,420 as
shown in Table 1.The CONSULTANT will invoice monthly as a percentage of the lump sum based on the
percentage of work completed during the billing period.
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The above is agreed upon by:
CDM Smith Inc. Date
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City + Winter S�urrgs Date
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