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Subterranean Wall Footing Surcharge

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I have a three-story wood frame structure over a one-story subterranean
parking structure. One of the basement walls is located at the property
line next to an existing building with similar construction, except that
the existing wall footing is at some 3' higher elevation than that of the
new building. The new building wall load is about 5 KLF and the existing
building is estimated to have similar loading. The soil is sandy and
subject to collapse under the existing wall footing when excavated. We
have designed the shoring system and trying to deal with the design of
the new wall and footing system to support the existing footing

I would appreciated some input from others who had similar experience as
far as the best method to deal with this situation, design, construction
procedure & sequence, and protection of the existing building.
Underpinning the existing wall footing is not an option at this time.

Thanks in advance.

Oshin Tosounian, S.E.
Los Angeles, CA
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