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Subsidence Investigation SDII Project t�fumber:3023547 Quiros-Martinez Residence-Zephyrhills,Florida 1.0 INTRODUCTION 1.1 Background SDII Global Corporation (SD1I) was retained by Cooperativa de Seguros Multip;fes to conduct a subsidence investigation in accordance with §627.707 Florida Statutes at the (�uiros-Martinez residence in Zephyrhilis, Florida. The purpose of the .investigation was to determine the existence of sinkhote activity and a sinkhole loss as defined by §627.706 Florid�� Statutes at the residence. This report provides the results of the subsidence investigatian and SDi1's recommendations for remedial actions to stabilize the foundation. 1.2 Scope of Work The following methods were used during the investigation to detennine the exist��nce of sinkhole activity at the residence. ❑ The residence was inspected to determine the nature and extent of reporked damage and to observe existing conditions across the property. ❑ The horneowner was interviewed to obtain the timeline for the damage„ chronology of construction, ownership of the structure, and background information relaCive to potential causes of damage to the structure. ❑ Available published data were reviewed regarding generai geologic and hydrogeologic conditions in the area of the residence. G A ground penetrating radar (GPR) survey was conducted inside and outside of the residence to determine the presence of anomalous soil conditions that mig}it be indicative of karst activity, buried debris, or otherwise disturbed or unusual subsurfac;e conditions. ❑ Hand auger borings and push penetrometer soundings were advanced tc� determine the composition and strength of subsurface materials near the foundation. ❑ Standard penetration test(SPT)borings were advanced to detennine t11e relative strengths of soils and to characterize deep geologic conditions. ❑ Representative soil and geologic material collected from the hand auger and SPT borings were analyzed in ti�e laboratory to confir�n visual interpretations and furth��r characterize the properties of the materials. ❑ Three test pits were excavated to observe foundation construction and geon-ietry directly. ❑ Relative floor elevation contour mapping was completed to identify an��malous floor elevation trends and establish a baseline contour map of the existing floor elevation. ❑ A structural assessment was completed to identify construction methods and structural deficiencies related to the potential causes of observed conditions. 1-1