HomeMy WebLinkAboutstatement of workEXHIBIT "C"
STATEMENT OF WORK
CITY OF MIAMI
LOCAL FLOOD MITIGATION STRATEGY PROJECT:
FLAGAMI STORMWATER DRAINAGE
1.0 INTRODUCTION
The City of Miami's (CITY) Stormwater System Improvement Plan is funded by the
2001/2002 legislature General Appropriation Act funds from the Florida Department of
Environmental Protection (H)EP) through Special Appropriation 1747A to support the
development of Local (Flood) Mitigation Strategies (LMS) in Miami -Dade County.
These funds are administered through the South Florida Water Management District
(DISTRICT) and dispersed and managed at the local level.
In response to a series of severe rainstorms including Hurricane Irene and the October
2000 "no name" storm, the CITY retained the professional engineering consulting
services of H. J. Ross Associates, Inc. to prepare a drainage model of the CITY's Flagami
section (bounded on the east by SW/NW 57th Avenue, on the north and west by NW 14th
Street and the Tamiami Canal, and on the south by SW 8th Street). This section of the
CITY is included in the C-4 canal drainage basin. The drainage model accepted by the
CITY in June 2001 identifies the existing extent of stormwater flooding during a 5, 25
and 100-year storm frequency and develops a proposed drainage improvement plan to
address those storm events.
2.0 SCOPE OF WORK
The stormwater drainage strategy for the Flagami section consists of two major
components. Stage 1 includes the construction of extensive stormwater collection and
exfiltration drainage systems. The systems will be connected to existing stormwater
outfalls into the C-4 canal to provide emergency overflow relief and will be designed and
permitted to meet all current environmental water quality regulations. It is the intent of
this stage to provide flood protection for a 5 year, 24 hour duration storm event and
provide the necessary environmental protection to the C-4 canal drainage system by pre-
treatment and retention of the first one -inch of runoff from the farthest point on the
drainage basin to the discharge point (Miami -Dade County Department of Environmental
Resources Management (DERM) criteria),
The stage 2 portion of the mitigation plan requires the construction of four (4) duplex
pump stations to divert excess runoff directly to the C-4 canal drainage system during
emergency events. The pumping facilities and 36-inch discharge pipes will be connected
to the Stage 1 systems and will be activated during emergency events in conjunction with
the C-4 forward pumping draw down to provide protection from flooding for storm
events exceeding the 5 year, 24 hour duration criteria. Any flooding that does occur will
be reduced within 24-hours following a storm event. Environmental water quality
requirements will be met by the Stage 1 systems. A Discharge Agreement and
Environmental Resource Permit will be secured.
Page 1 of 3, Exhibit "C" Statement of Work, Agreement C-13164
In order to contain costs and expedite design and construction of the Flagami stormwater
drainage systems, all of the improvements will be located within existing dedicated
public right of way. The purchase of land and/or the relocation of residents is not
anticipated at any stage of the project. Working in conjunction with DISTRICT
improvements to the C-4 canal drainage system, this project will have no impact on areas
outside of the Flagami section in the CITY.
Based on the extent of damage from the October 2000 "no name" storm, three projects
have been identified to begin implementation of improvements:
• Fairlawn Storm Sewers Phase II - Bounded by NW 52nd Avenue on the east; NW 57th
Avenue on the west; Flagler Street on the south; and NW 7th Street on the north.
• West End Storm Sewers Phase II (Part A&B) - Bounded by NW 65th Avenue on the
east; NW 69th Avenue on the west; Flagler Street on the south; and Tamiami Canal on
the north.
• Flagami Storm Sewers Phase II - Bounded by NW 62ad Avenue on the east; NW 67th
Avenue on the west; Flagler Street on the north; and SW 8th Street on the south.
These projects involve the design, permitting and construction of exfiltration drainage
pipes (french drains), pollutant control structures, storm drainage inlets, interconnection
pipes and surface restoration. The following work breakdown structure has been
developed to implement the goals and objectives of the CITY to implement the necessary
actions to alleviate future flooding in the study area.
3.0 WORK BREAKDOWN STRUCTURE
At the end of each task the CITY shall deliver 5 copies of the task deliverables to the
DISTRICT. The DISTRICT shall distribute the copies to the Local Mitigation Strategies
Group and FDEP (Review Group) for their review and comments. Review comments
and/or questions, if any, will be returned to the CITY within 14 days. The CITY shall be
responsible for properly addressing any and all comments/questions and concerns from
the Review Group, at which time, the deliverable will be deemed complete.
Task 1. Design and Permitting
• Identify the areas within the study boundaries and target them for design and
construction of new drainage system.
• Perform geotechnical investigations and topographical survey within the study
boundaries.
• Develop engineering design plans and permit applications for the improvements to be
made.
Deliverables: Design criteria report including results of investigations and survey.
Summary report including preliminary construction cost estimates.
Page 2 of 3, Exhibit "C" Statement of Work, Agreement C-13164
Task 2. Construction
• Bid and award projects for construction.
• Construction and Inspection services.
Deliverables: Plans and specifications for each construction project, including bid
tabulation summary and final engineer's cost estimate. Copies of construction contract(s)
and construction schedule(s), monthly construction progress reports and monthly updated
construction project schedules.
The CITY of Miami will retain a consultant to provide the professional engineering
services needed to complete this phase of the work. The contents shall include a
geotechnical and topographical survey, the design construction documents, and
construction inspection services.
Page 3 of 3. Exhibit "C" Statement of Work, Agreement C-13164