Geotechnical Evaluation report-2004

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i � � Aulik Associates Proj ect BL=04-06716 October 11, 2004 Page 4 C. Analyses and Recommendations C.1. Proposed Construction We understand the proposed carriage home will have an at-grade parking level with living quarters above. We assume the proposed carriage home will be stick framed and have a lower level grade of approximately 931 based upon the existing grades. For carriage home loads,we assume that wa111oad.ings will be less than 3 kips(3,000 pounds)per linear foot. If the proposed loads exceed these values, if the proposed grades differ by more than 2 feet from the assumed values, or if the design or location of the proposed carriage home changes, we should be informed. Additional analyses and revised recommenda.tions may be necessary. C.2. Discussion Based upon the previously-placed fill and the swam�deposited soils encountered within the proposed carriage home footprint,the pad area is not currently suitable for direct support of the proposed carriage home. For support of the proposed horne a soil correction is required prior to placing fill or footings. This will remove the soils unsuitable for support of the building and allow for the support of the home using typical spread footings bearing on properly-placed engineered fill. Due to the high water level encountered in the borings,we recommend considering raising grade such that concrete for foundations can be placed in a dry excavation. If grades are not raised, dewatering will likely be required as concrete should not be placed directly into water. C.3. Pad Preparation We recommend that all vegetation, topsoil,previously-placed fill, swamp deposited soils and previously- placed underground utilities(if encountered)be removed from the proposed carriage home pad and oversize areas. The following tabulation indicates the anticipated excavation depths at the boring locations. T'he elevations are based upon the provided benchmark.