INVITATION TO BID 24-07-01 CONSTRUCTION OF INTRACOASTAL SPORTS PARK

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Mr. Mark Castano, P.E. February 21, 2024 Keith & Associates, Inc. . Page 9 Geotechnical Study – Intra Coastal Sports Complex – 15800 Collins Avenue NV5 Project No.: 17990 CONSTRUCTION QUALITY ASSURANCE - INFRASTRUCTURE - ENERGY - PROGRAM MANAGEMENT - ENVIRONMENTAL It should be noted that the lateral load capacities provided above assume pile reinforcement of approximately one (1) to 2 percent. If the actual pile reinforcement differs significantly from this assumption, it might become necessary to revisit the lateral load recommendations provided in Table 4 above. 6. Foundations should be designed so that a minimum center-to-center pile spacing of three (3) pile diameters is maintained. 7. It has been widely held locally that for piles with a compression load of less than 80 kips no pile load test is required. We recommend that the local building official confirm this is acceptable for this project. 8. Piles should be installed within three (3) inches of specified plan location, and within two (2) percent of vertical or batter line. 9. During grouting of the pile excavation, the auger should be raised at a rate consistent with the capacity of the pump to ensure the entire pile shaft is uniformly grouted and to prevent caving of soils into the pile excavation. The actual grout volume for each ACIP pile should be at least 15 percent greater than the theoretical pile volume. Grout volume greater than 15 percent should be expected in the compressible silty zones. A grout head of at least five (5) feet should be maintained throughout the grouting of the pile shaft. 10. If during pile grouting any abnormalities such as sudden pressure drop or low grout take for a given interval of pile length are observed, the auger should be re-advanced to about five feet below the elevation where the anomaly was observed and the pile shaft properly re-grouted. Pumping should continue while the auger is rotated back down to the required remedial depth. 11. New piles should not be installed close to newly installed piles before the existing pile grout has started to set. Per the Florida Building Code, piles should not be installed closer than six (6) diameters within 12 hours. 12. Grout should be sampled during piling installation at a minimum frequency corresponding to the greater of one set of at least seven cubes each morning and afternoon during production or one set of at least six cubes for each 50 cubic yards of grout placed. Cubes should be tested for compressive strength at intervals of seven (7), 14, and 28 days. At least three (3) cubes should be tested at 28 days. Any remaining cubes should be retained for subsequent intermediate or 56-day breaks if required. 13. The steel reinforcement should be installed into the pile shaft immediately upon withdrawal of the grouting auger. Spacers should be fitted to the reinforcing cages to assure that they remain centered within the grouted shaft and maintain the required side cover. If obstructions are encountered during insertion of the steel cage, the cage should be extracted, the pile shaft re-drilled down to the originally drilled elevation and re-grouted to the ground surface, and the reinforcement re-installed. 14. An NV5 inspector should provide full-time quality control inspection to document the excavation and grouting of each pile and to provide, in conjunction with a licensed office engineer, any necessary field adjustments of pile tip elevations.