Exh 8A] _ ll0 A
abv a~w ~~ va a
October 9, 2000
This Preliminary Engineering Report was commissioned by the Atlantic Beach City
Commission as the second phase of a three part design effort to reduce the level of
flooding that Atlantic Beach has been experiencing for over a decade.
The first phase of the program developed very preliminary investigative data,
including a logging and orderly collation of all existing documentation and
complaints. This phase resulted in a letter report on the existing data, models, and a
summary of the master concept stormwater options as seen at that time.
The second phase, this Preliminary Engineering Phase, consists of additional data
collection, detailed hydrologic and hydraulic modeling, and development of a final
conceptplanandpartialpreliminaryengineeringdesigns/drawings. Very preliminary
environmental and permitting efforts were also accomplished within this phase.
Based on the results of this Preliminary Engineering Phase, the proposed plan
consists of channeling stormwater runoff through the Core City utilizing inverted
crown pavement, development of piped ocean outfall reversals, select water and
sanitary sewer improvements, reconstruction of Sherry Drive with curb and gutter and
including a piped drainage system to collect the Core City street runoff, channel
cleaning/dredging of the Sherman Creek Canal from Howell Park to Puckett Creek,
reconstruction of the culvert under 11~' Street, and installation of a tide control
structure with aloes-flow draw down pump system at Water Treatment Plant No 2.
The third phase of the design effort, Final Design, will develop fmal construction
plans and specifications. This process will include final development of concept
alternatives to back yard drainage, Town Center drainage, wetland mitigation, tidal
control, and other relatively minor concept issues which have several options
unresolved during the Preliminary Engineering Phase. Final Design will be
developed in two phases:
1. An "early-out" design for the reconstruction of Sherry Drive to 24' pavement
with curb & gutter. This is exactly the section designed under the ET&M
design and existing St. johns River Water Management District (SJR.WMD)
Atlantic Beach Stormwater Final Report
Execufive Summary, Page 1 of 2
Agenda #8A
October 9, 2000
permit, and will be constructed using this existing permit. Wetland impacts
will be carefully avoided during this design in order to avoid any Army Corps
of Engineers (ALOE) permit requirements.
2. As saon as the Sherry Drive design is completed and while it is being let to
contract, all remaining design effort will be .commenced. This phase will
involve modifying the existing SJRWNID permit to meet the new design, and
re-submission of the ACOE permit, either in Nationwide format as previously
submitted or in Individual permit format, depending on impacts and criteria of
the Final Design.
The current recommended improvements differ substantially from past engineering
studies of this area, largely due to the following:
• Compilation and coordination of existing data and complaints
• Acquisition of specific additional data
• Extensive field reconnaissance
• Highly detailed hydrologic and hydraulic modeling
• Input from Early Piety regarding tree impacts
• Detailed input, from the City Commission, Stormwater Review Committee,
Public Works, and from residents individually and at town meetings
• Development of innovative concepts
• The open mindedness ofthe City Commission, Stormwater Review Committee,
and the Public Works Department to accept innovative ideas
Throughout this document, figures and other related graphics have been inserted
within each related section, but references to specific figure have been deleted from
text due to compilation complexities. Additional informative data and graphics have
been included within the Appendix. Readers are encouraged to ask questions.
Atlantic Beach Stormwater Final Report
Executive Summary, Page 2 of 2