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Nationwide Insurance. - Center for Radiation Oncology, 7315 Green Slope Drive, Zephyrhills, FL Lab No.' 190442 Page 12 Based on the soil profile found by our borings and our experience with similar projects, we would estimate that approximately 400 to 600 cubic yards of grout injected through 38 points might be used in this type of stabilization process. Actual grout quantities may differ significantly from this estimate and can be best defined after several initial grout pipes are pumped. The points that extend the deepest to competent limestone should determine the locations of these initial grout points. A comprehensive set of compaction grouting recommendations has been included in the appendix of the report. We recommend that if the deep subsurface stabilization is done that a representative of our firm be present to monitor the grouting work. This monitoring will provide verification of grout quantities, depths of injection, and assist in answering questions that may arise during the repair program. Although the recommendations provided above have been formulated along recognized "standard of the industry" guidelines for sinkhole stabilization work and have then been tailored to address specific site conditions found by our borings and evaluation, the possibility that additional damage may occur to the building cannot be ruled out. A licensed contractor selected by the building's owner or Nationwide Insurance will be performing the work. Further involvement of CFTL in the stabilization process beyond this evaluation is one of a third party monitor, and therefore, any subsequent or consequential damage, which may occur to the building or property during the stabilization process shall not be the responsibility of Central Florida Testing Laboratories, Inc. We have included a grout recommendation sheet for use in bidding by contractors of the owner's or Nationwide's choosing. We are available to review any bids submitted to make comparative comments to aid in the selection of the most qualified contractor, if requested. Estimates received from qualified contractors should include costs for mobilization of equipment, drilling and installation of grouting pipe and pumping of grout, and should be compared to policy limits. A copy of the soil stabilization proposal should be sent to our office and upon receipt we will submit a separate proposal outlining our fees, costs and limits of liability to provide the necessary monitoring and inspection of the stabilization program to the owner or Nationwide Insurance. 2) It is our opinion that the building has sustained some differential settlement that will not be addressed by subsurface grouting alone. We recommend that Bracken Engineering be retained to conduct an additional more comprehensive structural assessment and make recommendations for any structural or non- structural repairs determined to be necessary. 3) We recommend that any cosmetic repairs necessary should not begin until at least 30 days after completion of the grouting to allow for equalization of stresses that may be imposed by the grouting on the subsurface soils. All cosmetic repairs should be done by a licensed building contractor. Estimated Stabilization Costs For budgeting purposes, we are providing an estimate of the cost of subsurface soil stabilization if performed according to our recommendations. This estimated Central Florida Testing Laboratories, Inc. 12625 - 40th Street North, Clearwater, FL 33762