BACOG (The Barrington Area Council of Governments), of which Tower Lakes is a member, recommends that driveways not be sealed with products containing coal tar because of environmental and health concerns associated with its use. See links below for information from BACOG regarding this issue. Talk to your contractor and spread the word to your neighbors.
See more information at these sites:
http://www.bacog.org/images/Coal_Tar_Fact_Sheet_BACOG_June_2015.pdf