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«.z Calvin, Giordano 8 Associates,. Inc. E X C E P T I O N A L S O L U T I O N S • It is essential to note that the same auger columns were installed by the same contractor at a similar setback from:the seawall and at similar intervals along the Intracoastal Park North as was the case with the Intracoastal Park South. The wall in the North Park is also of a similar age, and laterally supported through ' the use of tie-back rods (although in this case they are tied into the cap and not the columns but in both cases the tie backs are severely corroded). It therefore stands to reason that the°same cut tie=back:problerns and consequences4nay'arise to the North Park. Initially, we had hoped that a solution could be implemented wherein batter piles could be driven in.front of the existing concrete seawall system and tied into the cap to prevent-the need for a complete replacement. This methodology is what the initial'cost proposal was based on. Upon completion of the emergency repair of the failed seawall, CGA:requested that the Contractor mobilize to the North Park Wall to perform more extensive Building Code`Services excavations to confirm the composition, type and method of construction of-the Coastal Engineering . North Park Wall. During the excavation investigation it Was determined that:the Code-Enforcement wall is supported laterally by tie-back rods anchored into the cap. In order to set Construction Engineering$ Inspection batter piles in front of the wall, the cap would have to be cut or demolished,. Construction Services potentially rendering the wall temporarily unsupported and subject to failure contract coveminent- raid-repair. The existing flange on the T-piles supporting the wall is not of Data Technologies x' adequate condition or thickness to support the panels for this method,of repair ock%ctipmenl q hp h and appears be_lackin:g any steel rebar. Due to the poor construction observed • Emer�eiicq tiianagement hh p services during the excavations it has been,determined that the vibrations.caused by the Engineering driving of piles in the immediate vicinity of the wall may be enough to damage Governmental Services the wall irreparably: Indoor Air Quality Landscape.Amhiteeture-& Envirdnmental>Services. For these reasons, the batter pile & cap repair Solution is recommended to be Municipal Engineering abandoned-and we recommend a complete wall replacement for the North Park, Phiniii similar to that being performed on the southernmost portion of the South Park. Public Administration Rer+•�-cloprn'rn&.Urban The.requested Change Order from the Contractor to account for this additional Design scope and cost is $326,047.50. Renewable Energy Resort Develo rnent p We recognize.that the City is conscientious of costs when evaluating alternatives Surveying Mapping - for repairing and/or replacing seawalls at both Intracoastal Park locations: Transportation Plannino& Traffic Engineering: However, it is our opinion that the inherent:risk of allowing the wall to remain Utility&.Community as--is with good cause to suspect that there is structural.instability is imprudent. MaintenanceSeruices water:Resources Management 1800 Eller Drive,Sirite 600 Fort._auderdale,FL 33316 Phone°954.92d_7781 Fax: 954.921.8807 wv'w.cgdsolutibns.com Fort:Lauderdale west Palm Beach Port St. Lucie homestead Cleaiw;tter Jacksonville Atlanta