That depends on your soil but your soil ph will always be different. Most likely your soil ph will be lower. Add a little lime to your soil and dont worry about what the ph run off is. There really isn’t a need to test your soil run off if you ph your water and your plants look fine.
However if you have issues with your plants then possibly soil run off could tell you if your plants are up taking nutrients or locking them out.
Just my 2 cents
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