WELLHEAD PROTECTION AREA AND DRINKING WATER SUPPLY MANAGEMENT AREA DELINEATION

Subpart 1. Boundaries; wellhead protection area. A wellhead protection plan must have a map showing the boundaries of the wellhead protection area that were determined using the criteria in part 4720.5510 . Subp. 2. Documentation. A wellhead protection plan must document the delineation of the wellhead protection area. The documentation must: A. describe the hydrogeologic setting used to characterize the aquifer; B. identify the five delineation criteria described in part 4720.5510 , subparts 2 to 6; C. describe the delineation method used, including assumptions, and the supporting documentation for the assumptions; D. describe all parameters, other than the delineation criteria described in part 4720.5510 , used for the delineation; E. describe the delineation results, including: (1) the results of model calibrations, when a groundwater flow model is used; and (2) a narrative describing the uncertainties relating to the accuracy of the calculated wellhead protection area boundaries; F. specify the data elements used, including data sources; and G. contain a copy of the calculations performed or, when a computer model is used, the electronic data input and solution file. Subp. 3. Boundaries; drinking water supply management area. A wellhead protection plan must have a map showing the boundaries of the drinking water supply management area. The boundary of the drinking water supply management area must follow the wellhead protection area as closely as possible.