Expanding the North Wilton firehouse to make room for a tanker truck may prove to be impossible, First Selectman Bill Brennan announced Monday, March 2.However, he also said it may still be possible to create enough room for a tanker truck without expanding the building.\u201cI\u2019m reluctant to be going down [the road of a new building],\u201d Mr. Brennan said. \u201cWe can probably renovate this sufficiently to handle the needs for the next 10 years or so.\u201dThe health department has restrictions related to sewage and well systems, he said, that prevent the town from expanding the building.\u201cWhat can we physically put on the site?\u201d he asked rhetorically. \u201cThe septic system is basically built over ledge rock. It\u2019s OK and it\u2019s functioning, but if you add any additional mass to the building, you increase the water usage because expansions include the addition of rest room facilities. If you expand the mass of the building, you expand the sewage coming out. We would be required to have septic that meets the full code for the building.\u201dMr. Brennan said these restrictions present a \u201ctest of reality\u201d for the building, which has been a \u201ccomplex problem\u201d for many years.\u201cThe feeling is we are coping, and we can manage. This isn\u2019t life or death. \u2026 This is not fire station headquarters,\u201d Mr. Brennan said.A new building on a new site could cost anywhere from $6 million to $8 million, the first selectman said.For now, the Board of Selectmen has ordered an architectural and engineering study of the building, which will cost $90,000.