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TranSystems Corporation - LGM Construction

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Depth-to-water measurements are noted on boring log KB-2. Because groundwater<br />

levels were measured soon after completion of the borehole, the levels recorded likely<br />

do not represent stabilized groundwater.<br />

We have assumed a groundwater level of Elevation +3 feet, msl for our engineering<br />

analyses. This assumed groundwater elevation is within the range reported by CGS<br />

(2003) for the site vicinity.<br />

Because the project site lies close to the Oakland Estuary, San Leandro Bay and other<br />

tidally-influenced water bodies, we expect groundwater levels may fluctuate in response<br />

to tidal movement. It is also possible that the groundwater level could temporarily rise<br />

to the ground surface during periods of extensive rainfall and heavy surface runoff. We<br />

note that our groundwater level observations were made in mid-May 2008, following an<br />

unusually dry winter.<br />

5.4 VARIATIONS IN SUBSURFACE CONDITIONS<br />

Our interpretations of soil and groundwater conditions, as described above, are based<br />

on data obtained from our borings, our geologic research and laboratory data collected<br />

for this study. The conclusions and recommendations that follow are based on those<br />

interpretations. It is likely that undisclosed variations in subsurface conditions exist at<br />

the site, particularly with respect to fill thickness and composition, and that seasonal<br />

variations in groundwater levels will occur.<br />

94240/1(OAK8R061)/es Page 11 of 29 June 13, 2008<br />

© 2008 Kleinfelder

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