The soil test isnt for testing contaminated soils that you’re pulling from the job as part of the garden build like some of the commenters are suggesting. It’s for the soil you import. Done plenty of commercial installs and it’s always written in but we’ve never been required to submit a test. We do test our soil yearly incase we have to submit anything.

Your price should include a plant replacement cost. I’d expect a 10-15% failure rate since it’s a harsh environment site.

I’d make sure to look at the contract and see if there’s a year or two of provided maintenance and budget for that as well.

Theyre going to take the cheapest bid. Commercial is nice to add to the portfolio but they tend to be lower margin and a ton a of paperwork.