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Mr. Mark Castano, P.E. February 21, 2024 <br />Keith & Associates, Inc. . Page 10 <br />Geotechnical Study – Intra Coastal Sports Complex – 15800 Collins Avenue NV5 Project No.: 17990 <br /> <br />CONSTRUCTION QUALITY ASSURANCE - INFRASTRUCTURE - ENERGY - PROGRAM MANAGEMENT - ENVIRONMENTAL <br />7.2.2 Helical Piles <br /> <br />1. The proposed structures can also be supported using helical piles such as A.B. Chance <br />helical piles RS2875.203 round shaft or equivalent. <br /> <br />2. We recommend that each pile consist of a 14-inch-diameter helix configuration designed <br />for the allowable loads provided below. <br /> <br /> TABLE 5 - SUMMARY OF HELICAL PILE ALLOWABLE CAPACITIES <br />Helix Diameter (in) 14 <br />Allowable Compression Load (kips) 15 <br />Allowable Tension Load (kips) 3 <br />Allowable Lateral Load (kips) 0 <br />Est. Length Below Existing Grade (ft.) 26 <br /> <br />3. The contractor should be aware that is possible pile lengths may vary depending on actual <br />site conditions. The helical piles would be securely screwed into Layer 4 limestone. <br /> <br />4. Helical piles should be spaced a minimum three (3) feet apart. <br /> <br />5. Measurement of installation torque can provide an indication of capacity. A calibrated <br />gauge should be used during pile installation. We recommend the contractor provide the <br />torque requirements based on the specific anchor design to meet the recommended pile <br />capacities. <br /> <br />6. The piles shall be installed within two (2) inches of the specified plan location and within <br />two (2) percent of vertical. <br /> <br />7. Connections of the helical piles to the pile cap should be as recommended by the <br />manufacturer. <br /> <br />8. Lateral loads on the pile caps can be transferred to the bearing layer using inclined <br />(battered) piles. Helical piles have little to no lateral capacity. <br /> <br />9. The final helical selection and design should consider corrosion potential. Due to the <br />variable types of helical anchors available, the Contractor should submit the design of the <br />pile for review by NV5 and the project structural engineer. The design should be performed <br />and signed and sealed by a Professional Engineer registered in the State of Florida. <br /> <br />10. NV5 should monitor the installation of the helical piles to assure that the piles are installed in <br />accordance with the recommendations provided herein. If Ownership retains another <br />geotechnical engineer to observe foundation installation, that engineer will be required to <br />accept full responsibility for the foundation performance. <br /> <br />7.3 GROUND FLOOR SLABS <br /> <br />1. Ground floor slabs should be structurally supported due to the presence of the silt layer. <br />Driveways and the sports courts can be supported on grade if settlement tolerances of about <br />1.5 inches are acceptable. Otherwise, they should be pile supported. Placement of a geogrid <br />should be considered to better distribute the loads and control localized depressions. <br />