Minnesota Administrative Rules

4720.5550 CRITERIA FOR ASSESSING WELL VULNERABILITY.

Subpart 1.

Department determination.

The department shall use the criteria specified in this part to assign priority and notify a public water supplier in writing that a wellhead protection plan must be prepared for an existing well.

Subp. 2.

Well vulnerability criteria.

A public water supply well is vulnerable if:

A.

the well water contains ten milligrams per liter or more nitrate plus nitrite nitrogen;

B.

the well water contains quantifiable levels of pathogens as defined in part 7040.0100, subpart 26, or chemical compounds that indicate groundwater degradation as defined in Minnesota Statutes, section 103H.005, subdivision 6;

C.

the well water contains one tritium unit or more when measured with an enriched tritium detection method; or

D.

an enriched tritium analysis of the well water has not been performed within the past ten years; and

(1)

information on the well construction is not available; or

(2)

the geological material from the land surface to where the groundwater enters the public water supply well is:

(a)

fractured bedrock;

(b)

solution weathered bedrock;

(c)

sandstone bedrock;

(d)

unconsolidated material 0.062 millimeters (fine sand) or larger; or

(e)

a combination of the materials specified in units (a) to (d).

Statutory Authority:

MS s 103I.101

History:

22 SR 668

Published Electronically:

October 27, 2003