Heavy metals in soil

Hello all!

I’m an urban farmer who was recently tasked with creating a community food forest. I’m fairly new to doing this work on my own, and still have a lot to learn. while I’ve built up some theoretical knowledge, putting it into practice feels like a whole new journey.

I’d love your advice: what steps would you take to remediate soil with lead contamination? I’m considering phytoremediation using sunflowers and possibly mustards. Before sowing seeds, how should I prepare the soil knowing it contains toxic metals?

I’m based in Oregon, and since our season is wrapping up soon, my goal is to at least get the soil prepped this year so it’s ready for planting sunflowers and other remediation crops next season.

Any insights, resources, or experiences would be greatly appreciated! Please feel free to ask me questions if it helps give more specific guidance.