Environmental regulators are making themselves available to parents of students of a Trenton public school that this week announced its property tested positive for high lead levels, leading officials to close off some areas of the campus. The U.S. Environmental Protection Agency said on Thursday it will have staff available at the Ulysses S. Grant Intermediate School on Feb. 9 to answer questions from parents. A follow-up community meeting is planned for Feb. 21, the agency said. Those meetings come after school officials announced on Monday the EPA confirmed high lead levels linked to the Ca…