02-27-2002 Council Agenda - Laserfiche WebLink

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Mr. Sam Roberto Project BBXX- 01 -119A May 24, 2001 Page 3 B.4. Groundwater Measurements Groundwater was observed in the hollow-stern auger at a depth of approximately 9 feet as Boring ST -2 was advanced. After auger withdrawal, groundwater was observed in the open borehole of Borings ST -1 at a depth of approximately 6 '/ feet, and in the open borehole of Boring ST -2 at a depth of 15 feet. Though our period of observation was short, and more time would likely have been required for water levels in the boreholes to stabilize, our measurements indicate that groundwater may be located just below the lower boundary of the existing fill, within the swamp - deposited peat. C. Evaluation and Analyses C.1. Design Details No design plans were available as this report was prepared. We have assumed, however, that it would be desirable to build a two -story, wood -frame structure on the lot, perhaps with a partial or fidl basement. We have further assumed that bearing wall loads associated with such a structure will not exceed 4 kips per lineal foot. We have attempted to describe our understanding of the proposed construction to the extent it was reported to us by others. Depending on the extent of available information, assumptions may have been made based on our experience with similar projects. If we have not correctly recorded or interpreted the project details, we should be notified. New or changed information could require additional evaluation, analyses and /or recommendations. C.2. Building Support The existing fill, and the swamp - deposited peat present below it, is unsuitable for building support. Peat is highly compressible, and the presence of peat below the existing fill indicates that the existing fill was not likely intended for structural support. The low penetration resistances recorded in the existing fill further indicate that the existing fill was not well