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000- Since 1988 Florida's Leading Engineering Source Environmental • Geotechnical - Construction Materials Testing - Threshold and Special Inspections - Plan Review $ Code Compliance Mr. Anthony J. Donadio Donadio & Associates, Architects, P.A. 2001 9th Avenue, Suite 308 Vero Beach, Florida 32960 RE: Report of Geotechnical Exploration North County Library Addition 1001 County Road #512, Sebastian, Florida GFA Project No. 20-9197.00 Dear Mr. Donadio: April 24, 2020 GFA International, Inc. (GFA) has completed the subsurface exploration and geotechnical engineering evaluation for the above referenced project in accordance with the geotechnical and engineering service agreement for this project. The scope of services was completed in accordance with our Geotechnical Engineering Proposal No. 20-9197.00 dated March 9, 2020, planned in conjunction with and authorized by you. EXECUTIVE SUMMARY The purpose of our subsurface exploration was to classify the nature of the subsurface soils and general geomorphic conditions at the site and evaluate their impact upon the proposed construction. This report contains the results of our subsurface exploration and our engineering interpretations of these with respect to the project characteristics described to us, including providing recommendations for foundation design and site preparation. Per our prior telephone discussions and email correspondence with you, GFA understands that a single -story addition is planned for the North County Library in Sebastian, Florida. We have been provided with a site plan showing the location of the proposed construction on the property. Specific design loads have not been provided to GFA. For the foundation recommendations presented in this report, we assumed a maximum wall loading of 3 kips per linear foot and a maximum column load of 35 kips. The recommendations provided herein are based upon the above considerations. If the stated conditions are incorrect or if the project description is revised, please inform GFA so that we may review our recommendations with respect to any modifications. Two (2) standard penetration test (SPT) borings, advanced to an approximate depth of 20 feet below the existing ground surface, were performed for this study. The subsurface soil conditions encountered at the boring locations generally consisted of very loose to medium dense fine sand (SP), fine sand with silt (SP -SM), and silty fine sand (SM) to the termination depths. 607 NW Commodity Cove • Port St. Lucie, Florida 34986 - (772) 924-3575 • (772) 924-3580 (fax) • www.teamgfa.com