74:29:11:31Production area monitor well location and

spacing requirements. Production area monitor wells may be located no more than 400 feet from the production area and with spacing no greater than 400 feet between monitor wells. Alternative monitor well locations and spacing may be considered if the operator can demonstrate that the proposed location or spacing will adequately provide monitoring coverage to detect excursions in a timely manner. The department may require closer well spacing in the down gradient ground water flow direction from the production zone.

Source: 33 SDR 160, effective April 17, 2007.