Scientific studies conducted by hydrogeologists, licensed geologists or licensed professional engineers shall be provided, and such studies shall include, but are not limited to, calculations and modeling to include zone III mixing water flow, transmissivities, effective porosity, regional and local hydraulic gradients, depth to saturated zones, aquifer saturated zones, aquifer saturated thickness, boundary conditions, degree of confinement and recharge areas as appropriate to develop time of travel boundaries. The United States environmental protection agency methodology, "Wellhead Protection Area (WHPA) Delineation Code, Version 2.1", by Blandford and Huyakorn, April 1992, or equivalent, shall be used for calculating and modeling time of travel boundaries. The following shall constitute the boundaries for the wellhead protection overlay district:
OVERLAY DISTRICT BOUNDARIES
Zone | Criteria And Thresholds | Methods |
Zone IA | Minimum distance of 100 feet for wells and/or springs | Fixed radius |
Zone IB | 2 year time of travel | Calculated/modeled boundary |
Zone II | 5 year time of travel | Calculated/modeled boundary |
Zone III | 10 year time of travel | Calculated/modeled boundary |
(Ord. 501, 11-18-2008)