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PT & underpinning

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Good morning,
I have to underpin an existing residential PT foundation/slab with a new 3' wide footing (L=10').  The (E) tendons are spaced about 36 inches.
I am planning to cut 12" square holes between the tendons to allow excavation, shoring, and pouring.
Can anybody share similar design experience? 
Steve Gordin SE
Irvine CA