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i � � �_ ., Page 6 - #4220 92-4026 3.3 Site PreQaration As was previously indicated, the near surface soils at each of the boring locations indicated a soft, wet soil condition. As a result, based on the 11 borings in the building area, an average excavation depth of approximately 4' is required with extremes at the boring locations of 1-1/2' and 7-1/2'. The actual excavation depth may vary somewhat, and can be best judge� at the time of construction. The minimum - excavation depth at each of the boring locations is depicted in the attached Table 1. As was previously indicated, this excavation must be completed with a backhoe or dragline in order to _ _, minimize disturbance of the soil, which is not to be removed. If the underlying soils are disturbed, additional excavation depths may be required. A mass excavation is recommended for each of the x building locations in order to remove ali of the unsuitable soil below both the footings and the slab area. The excavation should extend at least 5' beyond the edge of the building, or sueh that a 1:1 oversize is � maintained below the perimeter footings, whichever is greater. In most locations, the excavation will require removal of soil below the groundwater. Dewatering may be required, or altemative excavation of soil below the water table may be required. If the excavation is completed below the water level, an experienced contractor should be utilized who is experienced in underwater excavation. Special precautions for below-water excavation are included in the Appendix. , In addition,full-time observation by a geatechnical engineer or his representative is highly recommended. Control of the groundwater by dewatering is the prefened method of construction. � � � twin c�t�r testinq