1. Prepared By: Cutcher & Associates, Inc. Coastal Engineers
Jupiter Reef Club Replacement Seawall Conceptual Design Overview August 25, 2016
Prepared By:
Cutcher & Associates, Inc Coastal Engineers

2. Seawall Replacement Design Criteria
Structural Stability & Longevity
Permitability
Construction methodology relative to site limitations
Cost
Construction Schedule
Vibration impact to existing structures
Impact to tenants & guests
Funding cycle

3. Existing Seawall:
- Does not provide the structural stability to meet the environmental loads
resulting from a significant storm event (1).
- Existing geometry and age prevents cost effective further restoration efforts
Partial failure would be catastrophic
Loss of upland infrastructure likely, inability to permit future structure
(1) JUPITER REEF CLUB STRUCTURAL ANALYSIS OF EXISTING SEAWALL, JULY, 2016

4. Replacement Seawall Conceptual Design
Two Basic Approaches
Steel Sheet Pile & Concrete Cap
Cantilever & Restrained
East of existing seawall – Difficult to permit, most expensive, construction challenges
West of existing seawall – Easier to permit, not feasible
Reinforced Concrete
Counterfort geometry – Easier to permit, difficult to construct, prohibits use of deck area
Duplicate existing geometry – Permitable, most cost effective

5. Two Basic Approaches Six Conceptual Designs
Option 1A - Offset Balanced Cantilever w/ steel sheet pile stem east of existing seawall
Option 1B - Same as 1A but with increased concrete thickness
Option 1C - Same as 1A but substitute FRP sheet, add micro piles
Option 2 - Cantilever Steel Sheet Pile, east of existing seawall
Option 3 - Concrete Counterfort w/ sheet pile stem wall west of existing seawall
Option 4 - Cantilever Steel Sheet Pile, west of existing seawall

6. Option 1A - Offset Balanced Cantilever w/ steel sheet pile stem, east of existing seawall

7. Option 1B - Same as Option 1A but with thickened concrete section

8. Option 1C - Same as Option 1A but substitute FRP sheet pile, add micro piles

9. Option 2 – Cantilever steel sheet pile w/ concrete cap, east of existing seawall

10. Option 3 - Concrete counterfort w/ steel sheet pile stem, west of existing seawall

11. Option 4 - Cantilever steel sheet pile w/ concrete cap, west of existing seawall

12. Ease of Permitting Least Difficult – Options 3 and 4
Moderate Difficulty w/ Justified Rationale – Option 1C
Moderate Difficulty – Option 1A, 1B
Most Difficult – Option 2
Anticipated permitting timeline: 120 – 180 days

13. Constructability Least Difficult – Options 1C Option 1A Option 1B
Moderate Difficulty – Option 3
Most Difficult – Option 2
Option 4 is not included since it would not be feasible

14. Construction Cost – Initial Estimate
Least Expensive – Options 1C: $1.6 Million
Option 1A: $1.75 Million
More Expensive – Option 3: $1.84 Million (does not include removal of existing structure)
Option 1B: $1.92 Million
Most Expensive – Option 2: $2.2 Million (does not include Giken machine)
Option 4 is not included since it would not be feasible

15. Anticipated Construction Schedule
Ordering & delivery of materials – 30 days
Mobilization of equipment – 14 days
Site preparation & create beach access – 14 days
Sheet pile installation & concrete forming – 60 days (assumes suitable weather and continued beach access)
Site clean up & demobilization – 7 days

16. Considerations
The existing seawall is vulnerable to a significant storm event (erosion in front of wall + saturated soil behind wall)
The existing toe wall sheet pile will continue to degrade – The rehabilitation did not address this (if the toe wall sheets fail, so does the seawall)
Statistical likelihood of such a storm increases with time (50 yr return interval storm has a 2% likelihood per year, over five yrs. there is 10% chance of occurrence)
Wall failure would likely be catastrophic (considerable loss of upland fill, damage or loss of pool, possible damage to residences)
Frequency of Occurrence and Intensity is forecasted to increase (current return interval storm models do NOT consider global climate change predictions)