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Subsurface Grouting Center for Radiation Oncology Zephyrhills, FL March 18, 2008 Page 2 GROUTING WORK PLAN Drilling equipment will install nominal two to three inch diameter flush joint steel casing (grout pipe) at grout point locations as shown on the sketch. The casing will extend to anticipated depths on the order of approximately 55 to 85 feet beneath the ground surface. The intent is to intercept the limestone/soil interface, and continue drilling until firm limestone is encountered. HBI will angle their grout pipes as requested to maximize program effectiveness by treating under the interior of the building. The grouting will begin at the limestone layer. At this depth the grout will be pumped at pressures in the range of 50 psi to 300 psi. The higher pressures are necessary in order for the grout to seek loose areas and voids that exist in the limestone layer. At the limestone layer, the grout will form a mass or bulb that will tend to travel along the limestone/soil interface. Upon successfully treating the limestone layer, indicated by a pressure buildup, the grout pipe is semi-continuously withdrawn in one to two foot intervals. At each interval, the grout is pumped to displace and densify the surrounding soils. Again, the grout tends to expand in a mass or bulb. This expansion will displace, densify and collapse piping voids and channels that may exist in the overburden soils. The pumping continues at each interval until a satisfactory buildup of pressure is attained. The injection of the subsurface grout at grout point locations is controlled by both volume and pressure. The elevation of adjacent ground surfaces and structures are monitored by HBI during the grouting process. SITE ACCESS The grout points will be installed to minimize the amount of exterior and interior damage to the landscaping, trees, lawn area, etc. However, HBI shall not be liable or responsible for damage that occurs due to normal performance of the work. This includes damage to the landscaping. All vehicles, breakables, etc., should be removed from our work area prior to our mobilization. A brief site meeting prior to our mobilization would be helpful in clarifying our access requirements and any potential problem areas. SCOPE In HBI's experience with similar sinkhole profiles, the grouting scope, and a similar project, the area yields an estimated quantity of approximately 400 to 600 cubic yards of compaction grout injected through approximately 38 primary grout points. The cost of the compaction grouting program should be between $101,320 and $152,440. Our Schedule of Prices summarizes our cost estimate. IIA~ --- A Keller Company