See pages 35 and 36 of the DEP's Gravel Roads Maintenance Manual, available on MARA's Resources page.  Note that it says, "Use of these and other chemical treatments, even salt, must be limited or not used at all in areas near water wells and in the shoreland zone. "

This Dust control thread is 6 months old, but I did not want to start a new one on the same topic.

The gravel/dirt road in my road association used to have calcium chloride applied to it annually in flake or liquid form by one of the members up until ~2013. This cost the road association ~$300-$400  for the purchase of a bulk CaCl (pallet?) each year and labor was provided by the road association member. Since that time the assoc. member has moved away, the road assoc. president changed and CaCl has not been applied in 7 years.

Recently some members have been complaining about dust from the road during the summer months when the road is heavily used and windows are more likely to be open. I would like to explore the current dust control options and costs to provide at the next annual road assoc. meeting this summer.

Question 1: Contractor contacts?

I am looking for contact information for a contractor or two to provide an estimate to apply a dust control measure to private road averaging 16 to 18 ft wide and about 0.6 miles long with some shorter secondary roads. The CaCl was applied to the road in the past during the grading and rolling of the road, typically completed in May and it seemed to effectively suppress dust and even hold the road together (weak salt cement) through the summer season.

Question 2: Alternate Dust control products? availability, use, experience in Maine?

Does anyone have any experience using a dust control products that is non-salt based. Maybe, one that includes a food grade product like vegetable oil or one with polymer binder. There is concern by the association president that CaCl "eats cars". And while CaCl is a salt, it is less corrosive than sodium chloride (rock salt) and it is what is used in the winter brine solutions applied to the road by State DOTs. It seems at odds to complain about dust and then also not consider one application of CaCl when you live in Maine which uses the same product in the winter, and in this case, you live close to saltwater and salt air. However, I would like to explore other available products that are environmentally friendly, even if they cost 2x or 3x more.

Any contacts/suggestions/experience is appreciated in advance.

Looks intriguing - but none of the literature you sent seems to say what the substance they use actually consists of.  It tells what it is not, but doesn't say what it is, or whether it will eventually end up in streams, and if so, what effect it might have.  It also doesn't say how long the product has been in use, what the long terms effects have been, or whether they have loyal repeat customers.  I'd love to know more about it.  My impression is that this may be pretty new technology, so maybe some of my questions don't have answers yet.  Definitely something to watch, though.