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1.0 INTRODUCTION This summary geotechnical report presents the results of a Subsidence Investigation of the Esther Barker residence located at 39740 Meadowood Loop in Zephyrhills, Florida. As related to BCI Engineers & Scientists, Inc. (BCI), the homeowner has reported recent cracking and settlement distress to the house and porch slab. Due to some concern that the cracking may be due to possible sinkhole activity, BCI was retained to conduct an evaluation of the property to determine the possible cause of the damage. As authorized by Ms. Charity Buchanan of Security First Insurance/Premier Adjusting Services, the following tasks were completed under the investigation: • A site inspection and damage assessment of the residence; • A ground penetrating radar (GPR) survey of the property; • Completion of four hand auger borings, a series of hand cone penetrometer probes, and two shallow test pit excavations; • A floor elevation survey of the interior of the house; • 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 on -going sinkhole activity at the property. 2.0 BCI FIELD INVESTIGATION 2.1 Site Description The Barker residence is a single -story, stucco -clad, masonry structure situated on the east side of Meadowood Loop in Zephyrhills, Florida. The subject property is located approximately '/2 -mile north- northeast of the intersection of Copeland Drive and Chancey Road, within Section 13, Township 26 South, Range 21 East, in southeast Pasco County, Florida. A site location map is shown on Figure 1. According to information obtained from the Pasco County Property Appraiser, the house was constructed in 1983 and was purchased by Mr. and Mrs. Barker in 1991. The house faces west and includes a garage at the sorthwest comer and a screened porch on the east side of the house. A site plan of the property is shown on Figure 2. The subject property is generally flat and lies at an elevation of approximately 70 to 80 feet above mean sea level (Zephyrhills, FL Quadrangle, USGS, 1993). The potentiometric surface of the Upper Floridan aquifer in the area is approximately 60 to 80 feet above mean sea level (Southwest Florida Water Management District, November 2008). Subsidence Investigation BCI Project No. 19 -17094 Barker Residence Claim No. 3428 March 2009 Page 1