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Footing Retrofit/Replacement Ideas

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I have a project which limits me to having to upgrade a concrete pad footing bearing area. The existing footing is 4' square x 12" deep. Here are my initial ideas:
1. Underpin (this requires shoring supported beams)
2. Demolish and replace (this requires shoring supported beams)
3. Pad extension on two sides (may run into existing reinforcement for continuous flexural reinforcement installation/coring) 
Any other ideas?
Thanks in advance.