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;:. l'Jaliml\ fide Insuranct.( - Center for Radiation Oncology, 7315 Green Slope Drive, Zephyrhills, FL Lab No. 190442 Page 5 TOPo2raphv A review of the 1990 USGS topographic quadrangle titled Dade City, FL shows that the site is located within a relatively hilly portion of Pasco County. The map also shows that the site is located along the west side of a large hill that ranges in elevation from approximately 175 feet to 85 feet National Geodetic Vertical Datum (NGVD). The map shows that the natural ground where the site is located is between 126 feet and 116 feet NGVD, which is an approximate 10-foot slope across the property from west to east. A portion of the topographic map is included in this report as Figure 6. Field observations indicate that the subject site has been reworked, filled and graded to produce a level building site and that a very steep slope has been formed directly adjacent to the west side of the building (beginning less than 5 feet from the west wall) that slopes down to an existing drainage basin. Potentiometric Surface A review of a recent (September 2005) map depicting the potentiometric surface of the upper Floridan aquifer distributed by the Southwest Florida Water Management District (SWFWMD) and the USGS showed that the potentiometric surface of the upper Floridan aquifer to be approximately 70 feet NGVD or approximately 50 feet below land surface, indicating that a downward hydraulic gradient does exist at this site. Aerial Photo2raphv A review of the available historical aerial photographs dating back to 1942 of Pasco County from the USGS, P ALMM, and the Pasco County Property Appraiser was conducted. These early aerials show the surrounding area as partially developed with cleared land, early roads and citrus groves located to the east of the site location. These aerial photos found that the site location was mostly undeveloped in 1941 and 1957 with abundant trees and with the northeast portion being a part of a citrus grove. The aerial photographs did not show any obvious land surface features of concern, such as wetlands, circular ponds, or mining operations, on the lot where the Center for Radiation Oncology building was later constructed. A copy of the 1957 aerial photograph showing the area surrounding the site location was included in this report as Figure 5. A recent color aerial photograph from 2006 showing development of the nearby area and the location of the Center for Radiation Oncology building is included as Figure 4. Floor Elevation Survey The elevation survey of the interior floor found a total elevation differential of 2.4 inches across the main floor of the building between the highest area along the eastern portion of the building (in the waiting areas, the reception area and in the east bathroom) and the lowest area along the western portion of the building (west-central office and laboratory). The raised rear concrete deck generally sloped away from the building's west elevation, which would be typical to allow for drainage. The front porch generally sloped away from the building, which is also typical to allow for drainage. The American Concrete Institute (ACI) Craftsman Series-Slab on Grade Table 5.2 lists the floor finish tolerance for conventional bull floated slabs to have a Central Florida Testing Laboratories, Inc. 12625 - 40th Street North, Clearwater, FL 33762