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This article should help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/improving-compacted-soil.htm

Residential weed killers, like Round-up, must break down in the soil within a week or two, so unless it was commercial grade, it should not cause an current issue in the soil.

As always though, to improve the health of the soil, add organic material like compost or composted manure. Buying a container of earthworms from a bait shop and adding them to the soil will also help keep the soil healthy.

As long as the soil from the location is not in your vegetable beds, then you are fine. The smell may reach you, but the chemical would be in such tiny amounts in the air that it would not be a concern.

I would however suggest that you check how the water shed in your area runs. If the location is uphill from you and you get water shed from the polluted location, this would contaminate your soil.

I am not Susan, but I am a master gardener. Having said that, there are great differences in different parts of the country. If you have boggy soil, you need to figure out where the water is coming from and re-route it somehow. If it is coming up from below, about all you can do (that I'm familiar with) is to dig a hole near by and use a sump pump. I realize that is impractical in most cases, but if it is available, it works well.
For improving the soil, just keep adding whatever types of compost you have available. For many years, I drove around in the pickup and picked up bags of leaves in the fall from wherever I would see them. Ask friends to save lawn mowings and use them. All food except meat and things cooked in oil. Oh, but NOT tomato or potato plants or parts.

The only way to know for certain is to have a soil test done. If there is salt in the soil, this article will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/reversing-soil-salinity.htm

These articles will help with your fall vegetable planting: https://www.gardeningknowhow.com/edible/vegetables/vgen/the-southern-fall-vegetable-garden.htm
https://www.gardeningknowhow.com/ornamental/flowers/fgen/plants-fall-garden.htm (veggies near bottom)
https://www.gardeningknowhow.com/special/seaside/growing-seaside-vegetables.htm