4720.5205 WELLHEAD PROTECTION AREA AND DRINKING WATER SUPPLY MANAGEMENT AREA DELINEATION.


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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.


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Subp. 2.

Documentation.

A wellhead protection plan must document the delineation of the wellhead protection area. The documentation must:

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A.

describe the hydrogeologic setting used to characterize the aquifer;


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B.

identify the five delineation criteria described in part 4720.5510, subparts 2 to 6;


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C.

describe the delineation method used, including assumptions, and the supporting documentation for the assumptions;


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D.

describe all parameters, other than the delineation criteria described in part 4720.5510, used for the delineation;


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E.

describe the delineation results, including:

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(1)

the results of model calibrations, when a groundwater flow model is used; and


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(2)

a narrative describing the uncertainties relating to the accuracy of the calculated wellhead protection area boundaries;



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F.

specify the data elements used, including data sources; and


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G.

contain a copy of the calculations performed or, when a computer model is used, the electronic data input and solution file.



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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.