Whenever any well is abandoned it shall be the obligation of the permittee and the operator of the well to set a two hundred foot (200′) cement plug in the bottom of the surface casing with the bottom of the plug one hundred feet (100′) below the surface casing section, and the top of the plug one hundred feet (100′) above the surface casing section; and to set a fifty foot (50′) cement plug in the top of the surface casing. No surface or conductor string of casing may be pulled or removed from a well. During initial abandonment operations, it will be the obligation of the permittee and the operator of the well to flood the well with mud-laden fluid weighing not less than ten (10) pounds per gallon, and the well will be kept filled to the top with said mud-laden fluid at all times; mud-laden fluid of the above specifications will be left in the well bore below and between cement plugs. Any additional provisions or precautionary measures prescribed by the state or the commission of the state in connection with the abandonment and plugging of a well shall be complied with by the permittee. (Ord. 508)