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North County Library Addition Geotechnical Exploration Report 1001 County Road #512, Sebastian, Florida April 24, 2020 GFA Project No. 20-9197.00 Page 9 of 10 Differential settlements result from differences in applied bearing pressures and variations in the compressibility characteristics of the subsurface soils. Because of the general uniformity of the subsurface conditions and the recommended site preparation and earthwork construction methods presented in this report, we anticipate that differential settlements of the structure should be within tolerable magnitudes (0.5 inch or less). Differential settlement between the existing library building and the addition is anticipated. Therefore, appropriate construction joints between these two structures are recommended if the structures will be attached. 3.6 Ground Floor Slabs The ground floor slab may be constructed upon either existing grade or granular fill following completion of the foundation site preparation and fill placement procedures outlined in this report. We recommend that a modulus of subgrade reaction (k) of 150 pounds per cubic inch (pci) be considered during design. The floor slab should be structurally separated from walls and columns to allow for differential vertical movement, unless a monolithic slab foundation is designed. Excessive moisture vapor transmission through foundation slabs can result in damage to floor coverings as well as cause other deleterious affects. An appropriate moisture vapor barrier should be placed beneath the slab to reduce moisture vapor from entering the structure through the slab. The barrier should be installed in general accordance with applicable ASTM procedures including sealing around pipe penetrations and at the foundation edges. 4.0 REPORT LIMITATIONS This consulting report has been prepared for the exclusive use of Donadio & Associates Architects, P.A. and other members of the project design team for the proposed addition to the North County Library located at 1001 County Road #512 in Sebastian, Florida. This report has been prepared in accordance with generally accepted local geotechnical engineering practices; no other warranty is expressed or implied. The evaluation submitted in this report is based in part upon the data collected during a field exploration. However, the nature and extent of variations throughout the subsurface profile may not become evident until construction. If variations then appear evident, it may be necessary to reevaluate information and professional opinions provided in this report. In the event changes are made in the nature, design, or location of the proposed building addition, the evaluation and opinions contained in this report should not be considered valid unless the changes are reviewed, and conclusions modified or verified in writing by GFA. GFA should be provided the opportunity to review the final foundation plans and specifications to determine if CFA's recommendations have been properly interpreted, communicated, and implemented. If GFA is not afforded the opportunity to participate in construction related aspects of foundation installation as recommended in this report or any report addendum, GFA cannot accept responsibility for the interpretation of our recommendations made in this report or in a report addendum for foundation performance. Gr/"