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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 2 of 10 Considering the results of our field exploration program, the subsurface soil conditions at the boring locations are generally favorable for support of the proposed structure on shallow foundations. A maximum allowable soil bearing pressure of 2,500 psf may be used for foundation design. The subgrade soils should be improved (densified) with compaction from the stripped grade prior to constructing the building pad. Before placing fill to achieve final grade, the upper 2 feet of soil below stripped grade should be compacted to a minimum of 95 percent maximum dry density as determined by the modified Proctor test (ASTM D 1557). Fill (including stem wall backfill) should be placed in 12 -inch thick lifts and compacted to achieve a minimum 95 percent modified Proctor maximum dry density. After completing the footing excavations, the bearing subgrade to a depth of 2 feet should be compacted to not less than 95 percent modified Proctor maximum dry density. We appreciate the opportunity to be of service to you during this phase of the project and look forward to a continued association. Please do not hesitate to contact us if you have any questions or comments, or if we may further assist you as your plans proceed. Respectfully Submitted, GFA International, Inc. Florida Certificate of Authorization No. 4930 This item has been digitally signed and sealed by John Kent, P.E. on the date adjacent to the seal. Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies. John Kent, P.E. Erik Soderstrom, E.I. Senior Project Engineer Geotechnical Department Manager Florida Registration No. 63218 Distribution: Mr. Anthony J. Donadio — Donadio & Associates Architects, P.A. 1 pdf 6FF