To hear and decide petitions for variances in accordance with MGL c. 40A, § 10, as amended, from the terms of this bylaw where the Board specifically finds that owing to circumstances relating to the soil conditions, shape or topography of such land or structures, but not affecting generally the zoning district in which it is located, a literal enforcement of the provisions of the bylaw would involve substantial hardship, financial or otherwise, to the petitioner or appellant and that desirable relief may be granted without substantial detriment to the public good and without nullifying or substantially derogating from the intent or purpose of the bylaw, provided that:
(a)
No variance within the Water Supply Protection District will be allowed through the Zoning Board of Appeals without a written advisory report from the Board of Health. Review and recommendation of the Planning Board and the Conservation Commission shall also be considered in the granting of the variance.