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

Home Browse Search

Mr. Mark Castano, P.E. February 21, 2024 Keith & Associates, Inc. . Page 6 Geotechnical Study – Intra Coastal Sports Complex – 15800 Collins Avenue NV5 Project No.: 17990 CONSTRUCTION QUALITY ASSURANCE - INFRASTRUCTURE - ENERGY - PROGRAM MANAGEMENT - ENVIRONMENTAL 6.2 ESTIMATED SETTLEMENT We estimate that foundations that are properly designed and constructed as recommended herein will experience total settlements of one (1) inch or less and maximum differential settlements of ½ inch. Given the granular nature of the subsurface materials at the site, we predict settlement will occur coincidental with the application of the building dead and live loads and for a short time after. Construction joints should be provided between the new and existing slabs to allow them to move independently. 6.3 IMPACTS OF SILT AND PEAT LAYERS It is noteworthy that the borings encountered near-surface silt and peat. The silt and peat are weak and therefore compressible. Stresses due to new fill could reach the compressible materials and cause settlement, especially where the materials are closer to the ground surface. Such settlement from filling could cause downdrag loads on adjacent pile foundations, and could adversely impact any pavements/pavers or miscellaneous structures supported on shallow foundations over these fills. Therefore, filling beneath new structures and pavements/pavers should be kept to a minimum. Depending on the importance of the structures that could be potentially impacted by these settlements, it may be prudent to consider pile support of such structures. 6.4 MISCELLANEOUS ENVIRONMENTAL IMPACTS Environmental forces consist of sinkholes, freeze thaw damage, shrinking and swelling soils, and hurricane scour can affect the performance of a foundation system. Sinkholes, freeze-thaw, and shrinking/swelling soils are generally not of concern in the South Florida area. While a detailed study of hurricane scour was outside the scope of this study, it is nonetheless our opinion that the foundation systems recommended herein when properly designed and constructed, will resist hurricane scour forces. It is therefore our opinion that these specific environmental forces have a low risk (on a scale of low, moderate, high) of adversely affecting foundation performance at this site provided the foundation system is designed and constructed as recommended herein. 7.0 RECOMMENDATIONS Our recommendations for geotechnical design and construction of the proposed project are provided in the following sections. 7.1 SITE PREPARATION AND GRADING 1. Geotechnical site preparation for construction should consist of removal of all existing structures, foundations, pavements, underground utilities, and other deleterious materials within the proposed addition footprints plus a five-foot perimeter where possible. Any voids created by the removal of these deleterious materials should be properly backfilled as described in the paragraphs below. We are not aware of the site development history beyond its current condition. Where old spread or other foundations are encountered, they should be removed and replaced with compacted fill if they interfere with new foundations or utilities. If the old foundations do not interfere with new construction, they could be left in place. Backfilling of old foundation excavations should be performed in accordance with the recommendations provided in this report.