The board of health may vary the application of any provision of 310 CMR 11.00 with respect to any particular case when, in its opinion, the enforcement thereof would do manifest injustice; provided, that the decision of the board of health shall not conflict with the spirit of these minimum standards. Any variance granted by the board of health shall be in writing. A copy of any such variance shall, while it is in effect, be available to the public at all reasonable hours in the office of the clerk of the city or town, or in the office of the board of health, and notice of the grant of variance shall be filed with the Commissioner of Environmental Quality Engineering of the Commonwealth.
310 CMR, § 11.11