Villa De Marco, Phase I and II,
Marco Island, FL
Phase I of the project consisted of installing a 365 LF cantilever steel sheet pile (SSP) wall with a concrete curtain wall and cap replacing the concrete seawall obliterated during Hurricane Irma. The Z-profile SSPs, ranging in length from 40’ to 52’, were installed to top of rock; damaged piers, concrete blocks, landscaping, and other hurricane debris were removed from the alignment. Once the seawall was secured, a 2’ deep x 4’ tall concrete curtain wall, spanning the tidal zone, was poured along the entire face followed by a 3’ x 2.5’ concrete cap. Additionally, a 40 LF section of SSP toe wall was constructed 20’ below water for scour counter measures. An engineered cathodic protection system was installed consisting of 34, 240 lb. aluminum anodes welded along the seawall face and toe wall. During all SSP installation the exposed building was monitored for vibrations and observed for settlement by a third-party surveyor. The steel sheet piles were successfully driven into place without causing any added duress on the already precarious structures.
Phase II of the project, currently underway, consists of filling in behind the new seawall with locally dredged sand, rebuilding the fishing pier and resident finger docks, along with restoring a 12,000 SF area in front of the seawall with fill and securing it with armor mat for scour protection. Timber dock and mooring piles ranging from 25 LF to 50 LF will be installed in their previous footprint with all new composite decking. The fishing pier located at the point will encompass grout filled steel pipe piles wrapped with HDPE sleeves, composite decking, IPE railing, ADA accessible ramps and viewpoints, and a fish cleaning table.