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Subsidence Inv�:.stigation SDII Project Number:3023547 Quiros-Martin��z Residence-Zephyrhills,F►orida 3.0 STRUCTURAL EVALUATION The purpose of the visual, structural assessment of the Quiros-Martinez residence was to help determine the;probable causes that have contributed to the damage of the residence. ln addition, the structural assessment provides critical information in determining the appropriate remedial actions for structures that may have been damaged by sinkhole activity. The homeowner, Mr. Martinez, and his representative, Mr. A1 Moreno, P.A., were present during the field portion of the assessme�tt and provided access to the residence and information regarding the timeline of the damage <ind the primary concerns. Mr. Martinez expressed that his main concern is the cracks in the e;xterior of the residence. 3.1 Genei•al Structural Observations According to information provided by the Pasco County Property Appraiser's website, the single-story :;tructure was built in 1980. The structure faces generally southeast and is constructed oi'masonry-block, exterior, load-bearing walls. The floor of the residence consists of a soil-support�;d, concrete slab-on-grade. The main roof structure was gable in design and was covered with��:sphalt shingles. There were no reported or observed additions. 3.2 ResuH:,s of Foundation Test Pit Excavation Test pit (TP;� excavations were performed along the perimeter of the main structure, the converted ga��age, and the driveway to directly observe the founctation construction and geometry. For approximate locations of the test pit excavations, see Figure 4. The results of'TA-1 indicate that the foundation of the main structure consists of a masonry block stem wall on �i continuous strip footing. The footing measured approximately 10 inches thick by an estimated 14 inches wide and the bottom of the footing was 24 inches bls. The stem wall was 22 inches in k�eight and was offset 3 inches on the footing. The top of the slab was 8 inches above the existing ground surface. The results of'TP-2 indicate that the foundation of the converted garage consists of a concrete slab-on-grade with a thickened edge monolithic footing. The footing was embedded 8 inches. The top of the slab was 3 inches above the existing ground surface, for a total footing thickness of 11 inches. The current Florida Building Code (1805.2) states that the minimum depth of footings below� the undisturbed ground surface shall be 12 inches. An improperly embedded foLmdation is �nore susceptible to movement caused by consolidation of near surface soils as a result of lack c�f adequate soil confinement. The results of T'P-3 indicate that the driveway consists of a 4-inch thick concrete slab-on-grade. The siab was 4-inches. 3.3 Summ��ry of Observed Damage The following paragraphs summarize the damage noted during the investigation. Approximate locations and ��hotographs representative of the damage are illustrated in Figure 2. All of the 3-1