If you have access to a water source it might be a good idea to saturate the ground area near the crack to see if you get any infiltration of free-standing water. If so, this would obviously be a good time to take corrective measures to eliminate that problem before you complete the project, landscape, etc. Doesn't sound to me like you have a structural issue - I have some of these cracks in my foundation wall too - virtually impossible to avoid. Good luck.
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