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Project No. JB-5B9 20 June 2006 Page 6 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 to our office for review. If the documentation is acceptable, we may allow the fill to remain in place. 6.1.3 Excavations and Utility Trenches As discussed earlier, stiff to very stiff silty clay and gravelly clay and medium dense to very dense clayey sand and silty sand was encountered at the time of drilling. We anticipate that the native soils may be excavated utilizing conventional equipment. Contractors, especially those digging utilities, should satisfy themselves as to the hardness of deposits and equipment required. If construction requires personnel to enter the excavation, the contractor must comply with the Occupational Health and Safety Administration regulations set forth in 29 CFR 1926. Utility trenches that parallel the sides of the buildings should be placed so that they do not extend below a line sloped down and away at a slope of ZH:1 V (horizontal to vertical) from the bottom outside edge of the perimeter foundations. All trenches should be backfilled with native materials compacted uniformly to the relative compaction specified in the following section. If local building codes require use of sand as the trench backfill, all utility trenches entering the building should be provided with an impervious seal of either cohesive soil or lean concrete where the trench passes under the building perimeter. The impervious plug should extend 4 feet into, and out of, the building perimeter. Jetting of trench ~Korbmacher Engineering, Inc.