A permitted test well that is found to produce the required amount of water may be converted to a water supply well if: It has been constructed in conformance with the regulations of this chapter for the use for which conversion is sought and COMAR 26.17.06; Upon written request, the conversion is approved by the Approving Authority; For wells that are to supply water for a public water supply system, the request is approved by the Department; and For wells that are to supply water for use on a dairy farm, the request is approved by the Maryland Department of Health. A test well may be converted to a monitoring well when requested in writing and approved by the Approving Authority. A test well may be converted to a standby well when requested in writing and approved by the Approving Authority. A test well shall be abandoned and sealed in accordance with this chapter within 180 days after completion unless a longer period of time is approved by the Approving Authority or the Approving Authority has approved its conversion to a water supply well, a monitoring well, or a geothermal well.