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Project No. JB-569 20 June 2006 Revised 18 October 2006 Page 6 6.0 RECOMMENDATIONS 6.1 Earthwork 6.1.1 General As previously stated, final grading plans were not available during preparation of this report. We recommend that final grading plans be reviewed by our office prior to starting the grading operations. The existing undocumented fill should be excavated and recompacted as shown in Figure 9, Typical Buttress and Subdrain. The fill limits shown on Figure 7 are approximate. As discussed earlier, the fill limits should be explored by trenching ~ ' to help determine the extent and depth of the fill. Our representative show/d be present during grading to observe that all undocumented fill in the building pad f areas has been excavated and recompacted. Compaction recommendations are f discussed in Section 6.1 .4 Fill Placement and Compaction. We recommend that the subgrade soils for floor and garage slabs, where used, and exterior flatwork be replaced with 12 inches of non-expansive compacted fill, Class 2 material or an approved equivalent placed on moisture-conditioned, compacted fill. The non-expansive fill should extend at least 2 feet beyond the floor and garage slab areas and exterior flatwork. We understand that a septic tank system may be located on the property. Information regarding the system should be forwarded to our office when available for review so that we may determine whether the system needs be removed. 6.1.2 Site Clearing All grading must be observed by our representative. It is especially important that our representative be present during the demolition, stripping and scarification process to observe whether undesirable materials are encountered. Loose, soft, uncontrolled fill, or disturbed native soils must be removed from all structural areas, beneath adjacent walks and slabs, beneath areas to receive fill, and beneath areas to be paved. Excavations must extend at least 5 feet beyond the structure and slab areas, if practicable. The term uncontrolled fill refers to any existing fill that was not properly inspected or tested by an engineering firm. As previously stated, any uncontrolled fill at the site should be removed in accordance with our recommendations. If testing and observation documentation exists for suspected undocumented fill, the documentation should be forwarded Korbmacher Engineering, Inc. .~