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GEI Consultants | City of Sunny Isles Beach | RFQ 26-07-01 55 <br />Cold Spring Harbor Historical Seawall Rehabilitation <br />Cold Spring Harbor, NY | Cold Spring Harbor Laboratory <br />GEI provided complete turnkey design, permitting, and construction phase <br />services to rehabilitate an existing 925-linear-foot historical seawall at Cold <br />Spring Harbor Laboratory. <br />The existing sandstone block seawall experienced frequent damage and chronic deterioration <br />due to its age and its location along the harbor front. A few sections of the seawall collapsed <br />over time; some repairs had been made, and additional repairs were needed. Stormwater runoff <br />from the upper portion of the campus runs downhill, discharging to the harbor through and over <br />the wall during heavy rainstorms. The high-water table behind the seawall and localized springs <br />were also problematic. This recurrent action caused further instability to the wall, since the <br />hydraulic flow carries the fines from the backfill through the open joints of the stone. <br />The seawall is subjected to daily tidal fluctuation and wind-driven wave energy during coastal <br />storms, and the wall commonly overtopped during severe coastal storms. GEI worked to repair <br />the seawall quickly and prevent any further deterioration; in addition, to off set future sea level <br />rise, GEI recommended that the wall be raised as high as possible without changing its character <br />or significantly increasing the cost of repair. The historical character of the wall was maintained <br />while repairs were made. <br />GEI performed the following services: Field investigation and verification of site conditions; <br />regulatory review and permitting; 30%/60%/100% design; bidding and construction phase <br />services. Construction was completed in December of 2022. <br />DATES <br />2022 <br />Original Schedule: Project <br />began in 2022, with <br />construction targeted for <br />completion by December <br />2022. <br />Actual Schedule: <br />Construction was completed <br />in December 2022, on <br />schedule. <br />FEES <br />Original Budget: $385,000 <br />(contract value for seawall <br />rehabilitation). <br />Actual Budget: $385,000 <br />(delivered within the original <br />contract value) <br />CLIENT REFERENCE <br />STEVE MONEZ <br />Chief Facilities Off icer <br />Cold Spring Harbor <br />Laboratory <br />516.367.8488 <br />KEY ELEMENTS <br />• Subsurface Investigations <br />• Wall Stability Analysis <br />• Geotechnical Engineering <br />• Permitting and Regulatory <br />Coordination <br />• Coastal Engineering <br />• Seawall Repair Design <br />• Construction Phase <br />Services