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Natiomwide Insuranct:t - Center for Radiation Oncology, 7315 Green Slope Drive, Zephyrhills, FL Lab NQ. 190442 Page 10 Sample % % 0/0 In situ Location! Soil uses Passing Passing Passing Liquid Plastic Plasticity Moisture Depth (ft.) Description Symbol 40 Sieve 200 Sieve 270 Sieve Limit Limit Index (%) HA5, 2.8-6.0 layey Sand, Brownish yellow SC 96.7 28.3 27.3 28 12 16 13.8 HA6, 3.3-6.0 rlayey Sand, Brownish yellow SC 97.7 26.5 25.7 25 15 10 16.1 B-1, 5-6.5 rlayey Sand, Brownish yellow SC 97.4 36.8 35.9 32 16 16 16. I B-3, 5-6.5 "Iayey Sand, Brownish yellow SC 89.6 28.6 26.6 33 17 16 16.4 B-4, 3-4.5 Clayey Sand, Dark yellowish brown SC 98.8 40.1 39.1 32 18 14 15.6 B-4, 10- I 1.5 "Iayey Sand, Dark yellowish brown SC 97.7 36.1 35.8 35 15 20 16.7 Clayey soils with a Plasticity Index (P.I.) of less than 10 are considered to have low plasticity, those with a P.I. between 10 and 30 are considered to have moderate plasticity, and soils with a P.I. over 30 are considered to be highly plastic. Based on the results of the laboratory tests, the shallow clays occurring beneath the Center for Radiation Oncology property are considered moderately plastic. The insitu moisture content of these soils was near the plastic limit, indicating that they were in a somewhat dry state when sampled. Conclusions The data developed in this comprehensive geotechnical evaluation of the Center for Radiation Oncology building indicates that the reported damage may be the result of a combination of factors including: the initial consolidation of fill soils, masonry mortar shrinkage, material shrinkage, construction defects, volume changes occurring within shallow clay soils and general ground subsidence due to sinkhole activity. These conclusions are based upon the following: Most of the exterior damage to this 9-year old building appeared to be older in nature. This type and age of damage is consistent with minor settling associated with the initial consolidation of fill soils upon loading and from masonry mortar shrinkage. Most of the minor exterior damage was noted along the west side of the building and based on the topographic map this side of the building would have the most (deepest amount of) fill under the foundation. Settlement occurring because of the consolidation of fill soils will generally occur within the first few years after a building is constructed and will lessen with time as the soils equalize to the load imposed by the weight of the structure. Environmental conditions such as periods of drought, periods of heavy rainfall and vibrations associated with nearby construction activities can cause additional minor cracking to occur. The water intrusion problem has been previously evaluated by Bracken Engineering and was determined to be a construction related defect. It appears that the building may have sustained settlement problems in the past or possibly slope stability problems. The added concrete grade beam present at the base on the west wall behind the radiation room appears to have been an attempt to provide additional support for the building to what was originally designed. Central Florida Testing Laboratories, Inc. 12625 - 40th Street North, Clearwater, FL 33762