Minn. R. agency 144, ch. 4725, WATER-SUPPLY WELLS, pt. 4725.5450

Current through Register Vol. 49, No. 19, November 4, 2024

Part 4725.5450 - VENTING WATER-SUPPLY WELLS

Subpart 1.Venting exceptions.

A water-supply well must be vented unless the well:

A. is a flowing well;

B. casing is used as a suction pipe;

C. has a packer jet assembly;

D. is used as a remedial well; or

E. is constructed with a watertight seal in lieu of a casing extension as specified in part 4725.4350, subpart 2.

Subp. 2.Vent construction.

A well vent must:

A. be constructed of materials complying with parts 4725.2250 to 4725.2650, or 4725.5150, subpart 1;

B. have watertight joints and terminate at least five feet above the regional flood level unless provided with a watertight seal as specified in part 4725.4350, subpart 2;

C. terminate a minimum of 12 inches above the established ground surface or the floor of a building as specified in part 4725.2175, except that a vent for a community public water-supply well must terminate a minimum of 18 inches above the established ground surface and the floor of a building as specified in part 4725.2175;

D. be screened with a noncorrosive mesh screen having openings of 1/16 inch or less and pointed downward; and

E. be connected to the casing according to part 4725.4850.

Subp. 3.Screened vents.

A screened vent incorporated into the underside of a well cap or cover may be used.

Subp. 4.Gas.

Any toxic or flammable gas must be vented from the well to the outside atmosphere.

Minn. R. agency 144, ch. 4725, WATER-SUPPLY WELLS, pt. 4725.5450

17 SR 2773; 33 SR 211

Statutory Authority: MS s 103I.101; 103I.111; 103I.205; 103I.221; 103I.301; 103I.401; 103I.451; 103I.501; 103I.525; 103I.531; 103I.535; 103I.541; 103I.621; 144.05; 144.12; 144.383; 157.04; 157.08; 157.09; 157.13