This is one of the more difficult green principles to describe. Site management focuses on things like containing the site and ensuring that things like storm water run-off doesn’t leave your property all the way to having an aesthetically pleasing piece of property. This can also encompass purchasing products for your project from local sources to support the local economy. You can argue that the total amount of energy consumed by the building structure will also have a direct impact on the community at large.
Some strategies to improve your site and community impact of your home is to build a rain garden, use rain barrels, plant drought resistant plants, buy local products, reduce your over carbon footprint, etc.