(1)   "Aquifer " means a geologic formation, group of geologic formations, or part of a geologic formation that contains enough saturated permeable material to yield significant quantities of water.

      (2)   "Direct Recharge Area" means that portion of a drainage basin in which water infiltrating vertically from the surface will intercept the water table.

      (3)   "Non-routine Maintenance" means activities necessary not more frequently than every twenty-four months to keep structures, and equipment in good repair.

      (4)   "Five year capture area" means the area around protected public water supply well heads delineated by the five-year travel time contour.

      (5)   "Overlay District" means a district described on the Zoning Map within which, through super-imposition of a special designation, certain regulations and requirements apply, in addition to those of the underlying zoning district.

      (6)   "Potable Water" means water that is satisfactory for drinking, culinary and domestic purposes meeting current drinking water standards.

      (7)   "Protected public water supply" means a public water system which services at least fifteen (15) service connections used by year-round residents or regularly serves at least twenty-five (25), year round residents, and having a one-year capture area defined through appropriate hydrologic studies.

      (8)   "Regulated substances" means chemicals and mixtures of chemicals that are health hazards. Materials packaged for personal or household use as food or drink for man or other animals are not regulated substances. Regulated substances include:

          A.    Chemicals for which there is scientific evidence that acute or chronic health effects may result from exposure including carcinogens, toxic and highly toxic agents, reproductive toxins, irritants, corrosives, sensitizes, hepatotoxins, nephrotoxins, neurotoxins, agents which act on the hematopoietic system, and agents which damage the lungs, skin, eyes or mucous membranes.

         B.    Mixtures of chemicals which have been tested as a whole and have been determined to be a health hazard.

         C.    Mixtures of chemicals which have not been tested as a whole but which contain any chemical which has been determined to be a health hazard and which comprises one percent (1%) or greater of the composition on a weight per unit basis, and mixtures of chemicals which include a carcinogen if the concentration of the carcinogen in the mixture is one-tenth of one percent (1%) or greater of the composition on a weight per unit weight basis.

         D.    Ingredients of mixtures prepared within the Well Head Protection Overlay District in cases where such ingredients are health hazards but comprise less than one-tenth of one percent (1%) of the mixture on a weight per unit weight basis if carcinogenic or less than one percent (1%) of the mixture on a width per unit weight basis if non- carcinogenic.

         E.    Petroleum and non-solid petroleum derivative (except non-PCB dielectric fluids).

      (9)   "Travel time contour" means a locus of points from which water takes an equal amount of time to reach a given destination such as well or well field.

      (10)   "Underground storage tank" means any one or combination of tanks (including underground pipes connected thereto) which is used to contain an accumulation of Regulated Substances and the volume of which (including the volume of underground pipes connected thereto) is ten percent (10%) or more beneath the surface of the ground. Flow-through process tanks and septic tanks approved by the Health Department or State Environmental Protection Agency as applicable are excluded from the definition of underground storage tanks.

      (11)   "Wellfield" means a tract of land that contains a number of wells for supplying water.

         (Ord. 00-60. Passed 9-18-2000.)