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1.0 INTRODUCTION This summary geotechnical report presents the results of a Subsidence Investigation of the Varkey Mathew & Amma Aley Rental Property located at 5012 5th Street in Zephyrhills, Florida. As related to BCI Engineers & Scientists, Inc. (BCI), the property owners have reported the recent formation of a ground collapse at the property. Due to some concern that the collapse may be related to possible sinkhole activity, BCI was retained to conduct an evaluation of the property to determine the probable cause of the damage. As authorized by Ms. Rebecca Leisure of ROL Insurance Consulting, the following tasks were completed under the investigation: . A site inspection and damage assessment of the property; . A ground penetrating radar (GPR) survey of the site; . Completion of four hand auger borings, a series of hand cone penetrometer probings, and two shallow test pit excavations; . A floor elevation survey of the interior of the structure; . Review of area soil survey, topographic, and aquifer potentiometric surface maps; . Completion of three standard penetration test (SPT) borings with laboratory testing of selected soil samples; and . Compilation of site data and evaluation of the potential for ongoing sinkhole activity at the property. 2.0 BCI FIELD INVESTIGATION 2.1 Site Description The Mathew/Aley Rental Property is a single-story, slab-on-grade, masonry block structure, situated on the eastern side of 5th Street in Zephyrhills, Florida. The subject property is located less than Y2-mile south southwest of the intersection of 5th Avenue (County Road 54) and Gall Boulevard (Highway 301), within Section 11, Township 26 South, Range 21 East, in southeastern Pasco County, Florida. A site location map is shown in Figure 1. According to information obtained from the Pasco County Property Appraiser, the house was originally constructed in 1962 and was purchased by the Mr. Mathew and Ms. Aley in 2005. The house faces southwest; however, for the purpose of this report the front of the house will be referred to as the west side. The house includes a single-car garage at the northwest comer, a bathroom addition on the east side and a detached wood storage shed at the northeast comer of the property. A site plan of the Mathew/Aley Rental Property is provided in Figure 2. The subject property is generally flat and level, and lies at an elevation of approximately 85 feet above mean sea level (Zephyrhills, Florida Quadrangle, USGS, 1987). The potentiometric surface of the Upper Floridan aquifer in the area is approximately 80 feet above mean sea level (Southwest Florida Water Management District, September 2007).