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foundation retrofit

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Dear Andrew:
 
In instaces such as these we have successfully used an ABC method.  A small section of footing is dug out, reinforced, dowelled, and poured with concrete.  An adjacent small section is then dug out, reinforced, and poured with concrete.  So your existing bearing wall situation is not overloaded during construction.  The length is one you will determine.  Three feet or four.  The contractor can do this all along the bearing wall, completing the wall in three steps.
 
Another approach may be to use helical retrofit anchors.  There would be minimal excavation.  One product is called Dixie/Aluma-Form.  It is an ICBO approved product.  They may be installed centered at 6 ft. or so.  This would also be determined based on your loads.  This would be advisable if you have poor soils.  Visit www.dixieanchor.com
 
With Joy and Hope,
Bob Freeman, Architect
Structural Designer
Integrated Design Services, Inc.
(949) 387-8500