Final answer:
If a footer is dug 2 inches deeper than required, the best corrective action is typically to adjust the elevation by adding more concrete, ensuring that it meets the structural specifications. Consulting with a structural engineer is advised for a professional assessment.
Step-by-step explanation:
If the footer was dug 2 inches deeper than the elevation, the corrective action needed would depend on the specific circumstances and design requirements of the structure being built. However, typically the most appropriate action (assuming no other constraints or instructions from the project engineer) would be to adjust the elevation by adding more concrete. This would ensure that the footer is at the correct elevation to match the design specifications and to maintain structural integrity.
Consulting with a structural engineer might still be a very good idea, especially if the depth discrepancy might be indicative of a potential problem either with the site or with the design specifications that were being followed. The structural engineer could provide a site-specific recommendation.
Filling with additional soil might not offer a stable or permanent solution due to soil settlement over time, and 'leaving as is' could potentially lead to structural issues if the footer does not align properly with the rest of the structure. So, these options are generally less preferred unless advised by a professional.