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; Page 8 - #4220 91-1043 <br />�-- Boring Surface Minimum Depth Estimated Elevation <br /> Num6er Elevation (t�Z Of Excavation (t�� Qf Bottom of Excavation (ft2 <br />`- 1 97.7 3.5 94.2 <br /> . 2 85.2 9 76.2 <br /> 3 94.0 A A <br />�--- Note: A - Excavation at the southwest corner of the existing building (near boring <br /> ,- <br /> #3) should extend to approximate elcvation 90' to match existing foundation <br /> elevation. Extending from this corner west and south we expect the <br />�— excavation will extend deeper, at least as deep as elevation 82' to remove <br /> uncontrolled fill overlying the competent natural deposited soils. <br /> Excavation along the west wall of the existing building should be performed in a manner <br />~ to avoid disturbing soils beneath the existing foundation elements. We recommend the <br />� excavation be performed to leave intact soil beyond the limits of the existing building to <br /> provide a 1:1 slope of the excavation downwards from the foundation and provide lateral <br /> support for the foundation soils for the existing construction. Careful �eld observation <br />__ will be required by a geotechnical engineer during this phase of the excavation to aid in <br /> distinguishing between portions of the existing fill which were placed in a controlled <br />� manner from those placed in an uncontrolled manner. Some contingency should be <br />_ provided in project budgeting for excavation that extends beyond the limits indicated by <br /> the borings. <br />