Thank you for your quick reply.
I have an update. After further investigation, I have found the original service invoice from the well company.

There was also something they used called N-well 110. Four gallons of it to be exact at $100 per gallon.
I looked it up, it's a 'powdered sulfamic acid'. I'm concerned after reading the msds sheet on it I found on the internet.

I think my plants are doomed that were in that area along with anything else living.

My husband said we should just wait out the summer until fall when the rest of the garden dies back and dig all the soil out from that area at least a foot down and replace with clean soil. (It's a raised bed).

Unless there's a miracle application I can put down and work into the soil, I think that's the only choice left. Bonus....I get to look at just half a garden for the next 4 months.

Thank you for your help. Love the garden web.

- Trina

Here is a link that might be useful: MSDS Sheet sulfamic acid

I'm sorry to hear about your problem Trina. There may be some good news however....

Since its seems that the contractor had an acid spill it may be easier to correct the problem than if you had chlorine contamination.

Secondly I believe that the contractor is liable for damage to your propery arising from misapplication or spilling the acid on your lawn. I would take pictures and contact the contractor and/or their insurance company and demand remediation for damage due to their negligence.

Here in the soils forum we have been discussing products that could be used to acidify alkaline soils. I suppose we have just found a very effective one, unfortunately at your expense.

As it said in the product safety sheet "This product is considered a strong acid ....All acids should be neutralized with a caustic or alkaline material.... The primary consideration of this product in regards to ecology would be the low acidic pH."

If indeed this acidic material is the source of your problem, an application of lime should correct the problem. The question then is "How much lime?". A soil test and lab recomendation would be indicated since you dont want to over-apply lime and end up with other problems.

Hopefully it is only a small amount affecting the top layer of soil.

If your well is in the garden, you need to move one or the other. Well water is easily contaminated by gardening stuff.

Some things to consider are that if you dig out the contaminated soil what would you need to do to dispose of it? Does your state require this soil be placed in a hazardous waste dump?
While the soils pH may be quite low proper applications of lime will correct that and the addition of organic matter will aid in restoring the bacterial activity, the Soil Food Web. This may take a year or more but may be a better alternative to removing the soil. Talk with the people at your local office of your state universities Cooperative Extension Service, they should have more knowledgeable answers than we can supply.

The product used by the well contractor is typical for cleaning screened wells. Holding them responsible for garden damage seems a bit much. Drilling a new well would certainly be disruptive.

Chlorine breaks down with light and heat. pH can be addressed with lime in a gradual fashion and adding organic matter to soil is almost always a winner. Time heals all in this case.

According to Wikipedia (I know,it's not the most authoritative source,but...),sulfamic acid eventually decomposes in water to form ammonium bisulfate, which is easily neutralized by lime. Chlorine is quickly inactivated by organic matter but gets converted to chloride. How much chlorine can you estimate went into the soil? If it was a lot, you could be dealing with a salt issue in the top layer.

rockguy raised an interesting issue re: proximity of well-head and garden. If you find that you need to give the well-head more space, this spill might be the perfect opportunity. River rock or pea-gravel might give the needed space and can be made quite attractive.

Such wonderful support, thanks to all.

I will begin by doing a soil test for a pH level and then see how much lime to add.

Unfortunately the placement of the garden was established well before we bought our home. I am keeping my fingers crossed that the well will last long enough and not be an issue again.

I'm excited to get started with the recovery process!

Thank You
- Trina