Answer: Your emergency treatment of removing the visible runoff was a good first step. Aside from flooding the soil to dilute the remaining residue, there's not much else you should do. I wouldn't try to counteract the lime with sulfur - you'd be getting into a chemist's line of work and it would be difficult to judge the ratios needed to neutralize what's been dumped into the soil. You might want to take a soil sample and have it tested, but that could be expensive at a private lab and University labs tend to be very slow in returning results. I'd just flood the soil to try and leach out what originally washed into the soil. Hopefully there wasn't enough washed into the bed to actually harm your plant.
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