Dear {Name},
I wanted to let you know in advance how sorry I am to be adding to your already-heavy workload. Unfortunately, you’re the only one I can turn to for {task}.
This is all due to {situation}. The good news is, this is temporary. I expect that {things will be back to normal/project will be done/a new volunteer will be in place/etc.} by {time frame}.
I know that this makes your schedule even more busy. Thank you so much for your flexibility, and please accept my sincere apology.
Sincerely,
{Name}
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Index of letter of apology templates