Storm Water treatment requirements are somewhat new to commercial development, especially to remodeling. They deal with the need to treat (clean) and meter (control) the quality and flow of water off of a site.
If a commercial project creates or disturbs impervious surfaces (buildings, sidewalks, paving, etc.) in excess of 5,000 square feet then you may need to install treatment and flow metering devices as part of the project. This is relevant to site accessibility upgrades because, for some projects, the construction could trigger these requirements.
The costs and delays associated with this item can be very high! If these requirements apply, you will want to know as soon as possible. Storm Water treatment requirements are a critical part of the commercial development research phase.