Minnesota Administrative Rules

4720.5205 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.

Statutory Authority:

MS s 103I.101

History:

22 SR 668

Published Electronically:

October 27, 2003