Because dry blasting creates a much larger dust plume than wet blasting, extra containment measures are needed. Read the article on Containment and Cleanup Tips for ideas.
3.) Be aware of OSHA guidelines involving silica.
As an abrasive blasting media, sand has been banned in many areas. This is because it contains crystalline silica. When inhaled during blasting, it can cause silicosis, a condition characterized by scarring and damage to the lung tissue.
To protect against this health risk, OSHA recommends "replacing crystalline silica materials with safer substitutes, whenever possible." (source)
We always recommend using 40/70 recycled crushed glass instead of sand, because it contains less than 1% free silica and therefore complies with the OSHA recommendation. The dustier the environment, the higher the risk of inhalation, so this becomes especially important during dry blasting.