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. . the point where the tributary subsurface water commingles with the subsurface flow beneath the floodplain of the Colorado River. (e) Presumction of under around diversion from the Colorado River. All water pumped from wells in the Colorado River floodplain is presumed to be Colorado River water. For the purposes of these regulations, water pumped from wells that is a mixture of water from the Colorado River and local recharge or other sources is considered commingled water, and thus Colorado River water. Water pumped from a well outside the Colorado River floodplain may be Colorado River water if the well is located within the regulatory surface area. Areas adjacent to the limitrophe section that do not naturally drain or return water to the Colorado River above the NIB are not subject to these regulations. Reclamation will follow the criteria described below to determine if the water pumped from a well is Colorado River water. (1) The reaulatorv surface. The regulatory surface represents a surface below which water pumped from wells is deemed to be Colorado River water. The regulatory surfa~e as determined by the Regional Director extends downstream from Lee Ferry to below the NIB and laterally away from the floodplain to an identifiable geologic or hydrologic barrier to subsurface flow that extends above the regulatory surface. Such a barrier is a geologic feature such as rock or other low-permeable boundary or a zone of very poor permeability where more hydraulic head than is physically or practically possible would be required to move significant volumes of water across the barrier. (i) The regulatory surface in areas adjacent to Lake Mead will consist of two parts: .,. to cf) o A. A fixed elevation which will define a 13