Architects are still working under limitations as they finish planning the $3 million Irving College School expansion.“The site is very constraining,” said Derrick Clemow of Upland Design during a recent briefing for the Warren County Board of Education. “We are working with a moving target.”The moving target Clemow referred to is soil around the planned building site. A plan to buy adjoining land to provide more area in which to install lines for drainage of sewage away from the buildings fell through due to the high asking price of the property.